pycompat: make fewer assumptions about sys.executable

There are many Python "bundlers" which create an archive to run a Python binary
from, and they may not set sys.executable at all - handle that case properly,
especially to run tests.

Differential Revision: https://phab.mercurial-scm.org/D6575

mercurial/chgserver.py

@@ -1,639 +1,641 b''
 # chgserver.py - command server extension for cHg
 #
 # Copyright 2011 Yuya Nishihara <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 """command server extension for cHg
 
 'S' channel (read/write)
     propagate ui.system() request to client
 
 'attachio' command
     attach client's stdio passed by sendmsg()
 
 'chdir' command
     change current directory
 
 'setenv' command
     replace os.environ completely
 
 'setumask' command (DEPRECATED)
 'setumask2' command
     set umask
 
 'validate' command
     reload the config and check if the server is up to date
 
 Config
 ------
 
 ::
 
   [chgserver]
   # how long (in seconds) should an idle chg server exit
   idletimeout = 3600
 
   # whether to skip config or env change checks
   skiphash = False
 """
 
 from __future__ import absolute_import
 
 import hashlib
 import inspect
 import os
 import re
 import socket
 import stat
 import struct
 import time
 
 from .i18n import _
 
 from . import (
     commandserver,
     encoding,
     error,
     extensions,
     node,
     pycompat,
     util,
 )
 
 from .utils import (
     procutil,
     stringutil,
 )
 
 def _hashlist(items):
     """return sha1 hexdigest for a list"""
     return node.hex(hashlib.sha1(stringutil.pprint(items)).digest())
 
 # sensitive config sections affecting confighash
 _configsections = [
     'alias',  # affects global state commands.table
     'eol',    # uses setconfig('eol', ...)
     'extdiff',  # uisetup will register new commands
     'extensions',
 ]
 
 _configsectionitems = [
     ('commands', 'show.aliasprefix'), # show.py reads it in extsetup
 ]
 
 # sensitive environment variables affecting confighash
 _envre = re.compile(br'''\A(?:
                     CHGHG
                     |HG(?:DEMANDIMPORT|EMITWARNINGS|MODULEPOLICY|PROF|RCPATH)?
                     |HG(?:ENCODING|PLAIN).*
                     |LANG(?:UAGE)?
                     |LC_.*
                     |LD_.*
                     |PATH
                     |PYTHON.*
                     |TERM(?:INFO)?
                     |TZ
                     )\Z''', re.X)
 
 def _confighash(ui):
     """return a quick hash for detecting config/env changes
 
     confighash is the hash of sensitive config items and environment variables.
 
     for chgserver, it is designed that once confighash changes, the server is
     not qualified to serve its client and should redirect the client to a new
     server. different from mtimehash, confighash change will not mark the
     server outdated and exit since the user can have different configs at the
     same time.
     """
     sectionitems = []
     for section in _configsections:
         sectionitems.append(ui.configitems(section))
     for section, item in _configsectionitems:
         sectionitems.append(ui.config(section, item))
     sectionhash = _hashlist(sectionitems)
     # If $CHGHG is set, the change to $HG should not trigger a new chg server
     if 'CHGHG' in encoding.environ:
         ignored = {'HG'}
     else:
         ignored = set()
     envitems = [(k, v) for k, v in encoding.environ.iteritems()
                 if _envre.match(k) and k not in ignored]
     envhash = _hashlist(sorted(envitems))
     return sectionhash[:6] + envhash[:6]
 
 def _getmtimepaths(ui):
     """get a list of paths that should be checked to detect change
 
     The list will include:
     - extensions (will not cover all files for complex extensions)
     - mercurial/__version__.py
     - python binary
     """
     modules = [m for n, m in extensions.extensions(ui)]
     try:
         from . import __version__
         modules.append(__version__)
     except ImportError:
         pass
-    files = [pycompat.sysexecutable]
+    files = []
+    if pycompat.sysexecutable:
+        files.append(pycompat.sysexecutable)
     for m in modules:
         try:
             files.append(pycompat.fsencode(inspect.getabsfile(m)))
         except TypeError:
             pass
     return sorted(set(files))
 
 def _mtimehash(paths):
     """return a quick hash for detecting file changes
 
     mtimehash calls stat on given paths and calculate a hash based on size and
     mtime of each file. mtimehash does not read file content because reading is
     expensive. therefore it's not 100% reliable for detecting content changes.
     it's possible to return different hashes for same file contents.
     it's also possible to return a same hash for different file contents for
     some carefully crafted situation.
 
     for chgserver, it is designed that once mtimehash changes, the server is
     considered outdated immediately and should no longer provide service.
 
     mtimehash is not included in confighash because we only know the paths of
     extensions after importing them (there is imp.find_module but that faces
     race conditions). We need to calculate confighash without importing.
     """
     def trystat(path):
         try:
             st = os.stat(path)
             return (st[stat.ST_MTIME], st.st_size)
         except OSError:
             # could be ENOENT, EPERM etc. not fatal in any case
             pass
     return _hashlist(map(trystat, paths))[:12]
 
 class hashstate(object):
     """a structure storing confighash, mtimehash, paths used for mtimehash"""
     def __init__(self, confighash, mtimehash, mtimepaths):
         self.confighash = confighash
         self.mtimehash = mtimehash
         self.mtimepaths = mtimepaths
 
     @staticmethod
     def fromui(ui, mtimepaths=None):
         if mtimepaths is None:
             mtimepaths = _getmtimepaths(ui)
         confighash = _confighash(ui)
         mtimehash = _mtimehash(mtimepaths)
         ui.log('cmdserver', 'confighash = %s mtimehash = %s\n',
                confighash, mtimehash)
         return hashstate(confighash, mtimehash, mtimepaths)
 
 def _newchgui(srcui, csystem, attachio):
     class chgui(srcui.__class__):
         def __init__(self, src=None):
             super(chgui, self).__init__(src)
             if src:
                 self._csystem = getattr(src, '_csystem', csystem)
             else:
                 self._csystem = csystem
 
         def _runsystem(self, cmd, environ, cwd, out):
             # fallback to the original system method if
             #  a. the output stream is not stdout (e.g. stderr, cStringIO),
             #  b. or stdout is redirected by protectfinout(),
             # because the chg client is not aware of these situations and
             # will behave differently (i.e. write to stdout).
             if (out is not self.fout
                 or not util.safehasattr(self.fout, 'fileno')
                 or self.fout.fileno() != procutil.stdout.fileno()
                 or self._finoutredirected):
                 return procutil.system(cmd, environ=environ, cwd=cwd, out=out)
             self.flush()
             return self._csystem(cmd, procutil.shellenviron(environ), cwd)
 
         def _runpager(self, cmd, env=None):
             self._csystem(cmd, procutil.shellenviron(env), type='pager',
                           cmdtable={'attachio': attachio})
             return True
 
     return chgui(srcui)
 
 def _loadnewui(srcui, args, cdebug):
     from . import dispatch  # avoid cycle
 
     newui = srcui.__class__.load()
     for a in ['fin', 'fout', 'ferr', 'environ']:
         setattr(newui, a, getattr(srcui, a))
     if util.safehasattr(srcui, '_csystem'):
         newui._csystem = srcui._csystem
 
     # command line args
     options = dispatch._earlyparseopts(newui, args)
     dispatch._parseconfig(newui, options['config'])
 
     # stolen from tortoisehg.util.copydynamicconfig()
     for section, name, value in srcui.walkconfig():
         source = srcui.configsource(section, name)
         if ':' in source or source == '--config' or source.startswith('$'):
             # path:line or command line, or environ
             continue
         newui.setconfig(section, name, value, source)
 
     # load wd and repo config, copied from dispatch.py
     cwd = options['cwd']
     cwd = cwd and os.path.realpath(cwd) or None
     rpath = options['repository']
     path, newlui = dispatch._getlocal(newui, rpath, wd=cwd)
 
     extensions.populateui(newui)
     commandserver.setuplogging(newui, fp=cdebug)
     if newui is not newlui:
         extensions.populateui(newlui)
         commandserver.setuplogging(newlui, fp=cdebug)
 
     return (newui, newlui)
 
 class channeledsystem(object):
     """Propagate ui.system() request in the following format:
 
     payload length (unsigned int),
     type, '\0',
     cmd, '\0',
     cwd, '\0',
     envkey, '=', val, '\0',
     ...
     envkey, '=', val
 
     if type == 'system', waits for:
 
     exitcode length (unsigned int),
     exitcode (int)
 
     if type == 'pager', repetitively waits for a command name ending with '\n'
     and executes it defined by cmdtable, or exits the loop if the command name
     is empty.
     """
     def __init__(self, in_, out, channel):
         self.in_ = in_
         self.out = out
         self.channel = channel
 
     def __call__(self, cmd, environ, cwd=None, type='system', cmdtable=None):
         args = [type, procutil.quotecommand(cmd), os.path.abspath(cwd or '.')]
         args.extend('%s=%s' % (k, v) for k, v in environ.iteritems())
         data = '\0'.join(args)
         self.out.write(struct.pack('>cI', self.channel, len(data)))
         self.out.write(data)
         self.out.flush()
 
         if type == 'system':
             length = self.in_.read(4)
             length, = struct.unpack('>I', length)
             if length != 4:
                 raise error.Abort(_('invalid response'))
             rc, = struct.unpack('>i', self.in_.read(4))
             return rc
         elif type == 'pager':
             while True:
                 cmd = self.in_.readline()[:-1]
                 if not cmd:
                     break
                 if cmdtable and cmd in cmdtable:
                     cmdtable[cmd]()
                 else:
                     raise error.Abort(_('unexpected command: %s') % cmd)
         else:
             raise error.ProgrammingError('invalid S channel type: %s' % type)
 
 _iochannels = [
     # server.ch, ui.fp, mode
     ('cin', 'fin', r'rb'),
     ('cout', 'fout', r'wb'),
     ('cerr', 'ferr', r'wb'),
 ]
 
 class chgcmdserver(commandserver.server):
     def __init__(self, ui, repo, fin, fout, sock, prereposetups,
                  hashstate, baseaddress):
         super(chgcmdserver, self).__init__(
             _newchgui(ui, channeledsystem(fin, fout, 'S'), self.attachio),
             repo, fin, fout, prereposetups)
         self.clientsock = sock
         self._ioattached = False
         self._oldios = []  # original (self.ch, ui.fp, fd) before "attachio"
         self.hashstate = hashstate
         self.baseaddress = baseaddress
         if hashstate is not None:
             self.capabilities = self.capabilities.copy()
             self.capabilities['validate'] = chgcmdserver.validate
 
     def cleanup(self):
         super(chgcmdserver, self).cleanup()
         # dispatch._runcatch() does not flush outputs if exception is not
         # handled by dispatch._dispatch()
         self.ui.flush()
         self._restoreio()
         self._ioattached = False
 
     def attachio(self):
         """Attach to client's stdio passed via unix domain socket; all
         channels except cresult will no longer be used
         """
         # tell client to sendmsg() with 1-byte payload, which makes it
         # distinctive from "attachio\n" command consumed by client.read()
         self.clientsock.sendall(struct.pack('>cI', 'I', 1))
         clientfds = util.recvfds(self.clientsock.fileno())
         self.ui.log('chgserver', 'received fds: %r\n', clientfds)
 
         ui = self.ui
         ui.flush()
         self._saveio()
         for fd, (cn, fn, mode) in zip(clientfds, _iochannels):
             assert fd > 0
             fp = getattr(ui, fn)
             os.dup2(fd, fp.fileno())
             os.close(fd)
             if self._ioattached:
                 continue
             # reset buffering mode when client is first attached. as we want
             # to see output immediately on pager, the mode stays unchanged
             # when client re-attached. ferr is unchanged because it should
             # be unbuffered no matter if it is a tty or not.
             if fn == 'ferr':
                 newfp = fp
             else:
                 # make it line buffered explicitly because the default is
                 # decided on first write(), where fout could be a pager.
                 if fp.isatty():
                     bufsize = 1  # line buffered
                 else:
                     bufsize = -1  # system default
                 newfp = os.fdopen(fp.fileno(), mode, bufsize)
                 setattr(ui, fn, newfp)
             setattr(self, cn, newfp)
 
         self._ioattached = True
         self.cresult.write(struct.pack('>i', len(clientfds)))
 
     def _saveio(self):
         if self._oldios:
             return
         ui = self.ui
         for cn, fn, _mode in _iochannels:
             ch = getattr(self, cn)
             fp = getattr(ui, fn)
             fd = os.dup(fp.fileno())
             self._oldios.append((ch, fp, fd))
 
     def _restoreio(self):
         ui = self.ui
         for (ch, fp, fd), (cn, fn, _mode) in zip(self._oldios, _iochannels):
             newfp = getattr(ui, fn)
             # close newfp while it's associated with client; otherwise it
             # would be closed when newfp is deleted
             if newfp is not fp:
                 newfp.close()
             # restore original fd: fp is open again
             os.dup2(fd, fp.fileno())
             os.close(fd)
             setattr(self, cn, ch)
             setattr(ui, fn, fp)
         del self._oldios[:]
 
     def validate(self):
         """Reload the config and check if the server is up to date
 
         Read a list of '\0' separated arguments.
         Write a non-empty list of '\0' separated instruction strings or '\0'
         if the list is empty.
         An instruction string could be either:
             - "unlink $path", the client should unlink the path to stop the
               outdated server.
             - "redirect $path", the client should attempt to connect to $path
               first. If it does not work, start a new server. It implies
               "reconnect".
             - "exit $n", the client should exit directly with code n.
               This may happen if we cannot parse the config.
             - "reconnect", the client should close the connection and
               reconnect.
         If neither "reconnect" nor "redirect" is included in the instruction
         list, the client can continue with this server after completing all
         the instructions.
         """
         from . import dispatch  # avoid cycle
 
         args = self._readlist()
         try:
             self.ui, lui = _loadnewui(self.ui, args, self.cdebug)
         except error.ParseError as inst:
             dispatch._formatparse(self.ui.warn, inst)
             self.ui.flush()
             self.cresult.write('exit 255')
             return
         except error.Abort as inst:
             self.ui.error(_("abort: %s\n") % inst)
             if inst.hint:
                 self.ui.error(_("(%s)\n") % inst.hint)
             self.ui.flush()
             self.cresult.write('exit 255')
             return
         newhash = hashstate.fromui(lui, self.hashstate.mtimepaths)
         insts = []
         if newhash.mtimehash != self.hashstate.mtimehash:
             addr = _hashaddress(self.baseaddress, self.hashstate.confighash)
             insts.append('unlink %s' % addr)
             # mtimehash is empty if one or more extensions fail to load.
             # to be compatible with hg, still serve the client this time.
             if self.hashstate.mtimehash:
                 insts.append('reconnect')
         if newhash.confighash != self.hashstate.confighash:
             addr = _hashaddress(self.baseaddress, newhash.confighash)
             insts.append('redirect %s' % addr)
         self.ui.log('chgserver', 'validate: %s\n', stringutil.pprint(insts))
         self.cresult.write('\0'.join(insts) or '\0')
 
     def chdir(self):
         """Change current directory
 
         Note that the behavior of --cwd option is bit different from this.
         It does not affect --config parameter.
         """
         path = self._readstr()
         if not path:
             return
         self.ui.log('chgserver', 'chdir to %r\n', path)
         os.chdir(path)
 
     def setumask(self):
         """Change umask (DEPRECATED)"""
         # BUG: this does not follow the message frame structure, but kept for
         # backward compatibility with old chg clients for some time
         self._setumask(self._read(4))
 
     def setumask2(self):
         """Change umask"""
         data = self._readstr()
         if len(data) != 4:
             raise ValueError('invalid mask length in setumask2 request')
         self._setumask(data)
 
     def _setumask(self, data):
         mask = struct.unpack('>I', data)[0]
         self.ui.log('chgserver', 'setumask %r\n', mask)
         os.umask(mask)
 
     def runcommand(self):
         # pager may be attached within the runcommand session, which should
         # be detached at the end of the session. otherwise the pager wouldn't
         # receive EOF.
         globaloldios = self._oldios
         self._oldios = []
         try:
             return super(chgcmdserver, self).runcommand()
         finally:
             self._restoreio()
             self._oldios = globaloldios
 
     def setenv(self):
         """Clear and update os.environ
 
         Note that not all variables can make an effect on the running process.
         """
         l = self._readlist()
         try:
             newenv = dict(s.split('=', 1) for s in l)
         except ValueError:
             raise ValueError('unexpected value in setenv request')
         self.ui.log('chgserver', 'setenv: %r\n', sorted(newenv.keys()))
         encoding.environ.clear()
         encoding.environ.update(newenv)
 
     capabilities = commandserver.server.capabilities.copy()
     capabilities.update({'attachio': attachio,
                          'chdir': chdir,
                          'runcommand': runcommand,
                          'setenv': setenv,
                          'setumask': setumask,
                          'setumask2': setumask2})
 
     if util.safehasattr(procutil, 'setprocname'):
         def setprocname(self):
             """Change process title"""
             name = self._readstr()
             self.ui.log('chgserver', 'setprocname: %r\n', name)
             procutil.setprocname(name)
         capabilities['setprocname'] = setprocname
 
 def _tempaddress(address):
     return '%s.%d.tmp' % (address, os.getpid())
 
 def _hashaddress(address, hashstr):
     # if the basename of address contains '.', use only the left part. this
     # makes it possible for the client to pass 'server.tmp$PID' and follow by
     # an atomic rename to avoid locking when spawning new servers.
     dirname, basename = os.path.split(address)
     basename = basename.split('.', 1)[0]
     return '%s-%s' % (os.path.join(dirname, basename), hashstr)
 
 class chgunixservicehandler(object):
     """Set of operations for chg services"""
 
     pollinterval = 1  # [sec]
 
     def __init__(self, ui):
         self.ui = ui
         self._idletimeout = ui.configint('chgserver', 'idletimeout')
         self._lastactive = time.time()
 
     def bindsocket(self, sock, address):
         self._inithashstate(address)
         self._checkextensions()
         self._bind(sock)
         self._createsymlink()
         # no "listening at" message should be printed to simulate hg behavior
 
     def _inithashstate(self, address):
         self._baseaddress = address
         if self.ui.configbool('chgserver', 'skiphash'):
             self._hashstate = None
             self._realaddress = address
             return
         self._hashstate = hashstate.fromui(self.ui)
         self._realaddress = _hashaddress(address, self._hashstate.confighash)
 
     def _checkextensions(self):
         if not self._hashstate:
             return
         if extensions.notloaded():
             # one or more extensions failed to load. mtimehash becomes
             # meaningless because we do not know the paths of those extensions.
             # set mtimehash to an illegal hash value to invalidate the server.
             self._hashstate.mtimehash = ''
 
     def _bind(self, sock):
         # use a unique temp address so we can stat the file and do ownership
         # check later
         tempaddress = _tempaddress(self._realaddress)
         util.bindunixsocket(sock, tempaddress)
         self._socketstat = os.stat(tempaddress)
         sock.listen(socket.SOMAXCONN)
         # rename will replace the old socket file if exists atomically. the
         # old server will detect ownership change and exit.
         util.rename(tempaddress, self._realaddress)
 
     def _createsymlink(self):
         if self._baseaddress == self._realaddress:
             return
         tempaddress = _tempaddress(self._baseaddress)
         os.symlink(os.path.basename(self._realaddress), tempaddress)
         util.rename(tempaddress, self._baseaddress)
 
     def _issocketowner(self):
         try:
             st = os.stat(self._realaddress)
             return (st.st_ino == self._socketstat.st_ino and
                     st[stat.ST_MTIME] == self._socketstat[stat.ST_MTIME])
         except OSError:
             return False
 
     def unlinksocket(self, address):
         if not self._issocketowner():
             return
         # it is possible to have a race condition here that we may
         # remove another server's socket file. but that's okay
         # since that server will detect and exit automatically and
         # the client will start a new server on demand.
         util.tryunlink(self._realaddress)
 
     def shouldexit(self):
         if not self._issocketowner():
             self.ui.log(b'chgserver', b'%s is not owned, exiting.\n',
                         self._realaddress)
             return True
         if time.time() - self._lastactive > self._idletimeout:
             self.ui.log(b'chgserver', b'being idle too long. exiting.\n')
             return True
         return False
 
     def newconnection(self):
         self._lastactive = time.time()
 
     def createcmdserver(self, repo, conn, fin, fout, prereposetups):
         return chgcmdserver(self.ui, repo, fin, fout, conn, prereposetups,
                             self._hashstate, self._baseaddress)
 
 def chgunixservice(ui, repo, opts):
     # CHGINTERNALMARK is set by chg client. It is an indication of things are
     # started by chg so other code can do things accordingly, like disabling
     # demandimport or detecting chg client started by chg client. When executed
     # here, CHGINTERNALMARK is no longer useful and hence dropped to make
     # environ cleaner.
     if 'CHGINTERNALMARK' in encoding.environ:
         del encoding.environ['CHGINTERNALMARK']
 
     if repo:
         # one chgserver can serve multiple repos. drop repo information
         ui.setconfig('bundle', 'mainreporoot', '', 'repo')
     h = chgunixservicehandler(ui)
     return commandserver.unixforkingservice(ui, repo=None, opts=opts, handler=h)

mercurial/debugcommands.py

@@ -1,3481 +1,3481 b''
 # debugcommands.py - command processing for debug* commands
 #
 # Copyright 2005-2016 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import codecs
 import collections
 import difflib
 import errno
 import operator
 import os
 import random
 import re
 import socket
 import ssl
 import stat
 import string
 import subprocess
 import sys
 import time
 
 from .i18n import _
 from .node import (
     bin,
     hex,
     nullhex,
     nullid,
     nullrev,
     short,
 )
 from . import (
     bundle2,
     changegroup,
     cmdutil,
     color,
     context,
     copies,
     dagparser,
     encoding,
     error,
     exchange,
     extensions,
     filemerge,
     filesetlang,
     formatter,
     hg,
     httppeer,
     localrepo,
     lock as lockmod,
     logcmdutil,
     merge as mergemod,
     obsolete,
     obsutil,
     phases,
     policy,
     pvec,
     pycompat,
     registrar,
     repair,
     revlog,
     revset,
     revsetlang,
     scmutil,
     setdiscovery,
     simplemerge,
     sshpeer,
     sslutil,
     streamclone,
     templater,
     treediscovery,
     upgrade,
     url as urlmod,
     util,
     vfs as vfsmod,
     wireprotoframing,
     wireprotoserver,
     wireprotov2peer,
 )
 from .utils import (
     cborutil,
     compression,
     dateutil,
     procutil,
     stringutil,
 )
 
 from .revlogutils import (
     deltas as deltautil
 )
 
 release = lockmod.release
 
 command = registrar.command()
 
 @command('debugancestor', [], _('[INDEX] REV1 REV2'), optionalrepo=True)
 def debugancestor(ui, repo, *args):
     """find the ancestor revision of two revisions in a given index"""
     if len(args) == 3:
         index, rev1, rev2 = args
         r = revlog.revlog(vfsmod.vfs(encoding.getcwd(), audit=False), index)
         lookup = r.lookup
     elif len(args) == 2:
         if not repo:
             raise error.Abort(_('there is no Mercurial repository here '
                                 '(.hg not found)'))
         rev1, rev2 = args
         r = repo.changelog
         lookup = repo.lookup
     else:
         raise error.Abort(_('either two or three arguments required'))
     a = r.ancestor(lookup(rev1), lookup(rev2))
     ui.write('%d:%s\n' % (r.rev(a), hex(a)))
 
 @command('debugapplystreamclonebundle', [], 'FILE')
 def debugapplystreamclonebundle(ui, repo, fname):
     """apply a stream clone bundle file"""
     f = hg.openpath(ui, fname)
     gen = exchange.readbundle(ui, f, fname)
     gen.apply(repo)
 
 @command('debugbuilddag',
     [('m', 'mergeable-file', None, _('add single file mergeable changes')),
     ('o', 'overwritten-file', None, _('add single file all revs overwrite')),
     ('n', 'new-file', None, _('add new file at each rev'))],
     _('[OPTION]... [TEXT]'))
 def debugbuilddag(ui, repo, text=None,
                   mergeable_file=False,
                   overwritten_file=False,
                   new_file=False):
     """builds a repo with a given DAG from scratch in the current empty repo
 
     The description of the DAG is read from stdin if not given on the
     command line.
 
     Elements:
 
      - "+n" is a linear run of n nodes based on the current default parent
      - "." is a single node based on the current default parent
      - "$" resets the default parent to null (implied at the start);
            otherwise the default parent is always the last node created
      - "<p" sets the default parent to the backref p
      - "*p" is a fork at parent p, which is a backref
      - "*p1/p2" is a merge of parents p1 and p2, which are backrefs
      - "/p2" is a merge of the preceding node and p2
      - ":tag" defines a local tag for the preceding node
      - "@branch" sets the named branch for subsequent nodes
      - "#...\\n" is a comment up to the end of the line
 
     Whitespace between the above elements is ignored.
 
     A backref is either
 
      - a number n, which references the node curr-n, where curr is the current
        node, or
      - the name of a local tag you placed earlier using ":tag", or
      - empty to denote the default parent.
 
     All string valued-elements are either strictly alphanumeric, or must
     be enclosed in double quotes ("..."), with "\\" as escape character.
     """
 
     if text is None:
         ui.status(_("reading DAG from stdin\n"))
         text = ui.fin.read()
 
     cl = repo.changelog
     if len(cl) > 0:
         raise error.Abort(_('repository is not empty'))
 
     # determine number of revs in DAG
     total = 0
     for type, data in dagparser.parsedag(text):
         if type == 'n':
             total += 1
 
     if mergeable_file:
         linesperrev = 2
         # make a file with k lines per rev
         initialmergedlines = ['%d' % i
                               for i in pycompat.xrange(0, total * linesperrev)]
         initialmergedlines.append("")
 
     tags = []
     progress = ui.makeprogress(_('building'), unit=_('revisions'),
                                total=total)
     with progress, repo.wlock(), repo.lock(), repo.transaction("builddag"):
         at = -1
         atbranch = 'default'
         nodeids = []
         id = 0
         progress.update(id)
         for type, data in dagparser.parsedag(text):
             if type == 'n':
                 ui.note(('node %s\n' % pycompat.bytestr(data)))
                 id, ps = data
 
                 files = []
                 filecontent = {}
 
                 p2 = None
                 if mergeable_file:
                     fn = "mf"
                     p1 = repo[ps[0]]
                     if len(ps) > 1:
                         p2 = repo[ps[1]]
                         pa = p1.ancestor(p2)
                         base, local, other = [x[fn].data() for x in (pa, p1,
                                                                      p2)]
                         m3 = simplemerge.Merge3Text(base, local, other)
                         ml = [l.strip() for l in m3.merge_lines()]
                         ml.append("")
                     elif at > 0:
                         ml = p1[fn].data().split("\n")
                     else:
                         ml = initialmergedlines
                     ml[id * linesperrev] += " r%i" % id
                     mergedtext = "\n".join(ml)
                     files.append(fn)
                     filecontent[fn] = mergedtext
 
                 if overwritten_file:
                     fn = "of"
                     files.append(fn)
                     filecontent[fn] = "r%i\n" % id
 
                 if new_file:
                     fn = "nf%i" % id
                     files.append(fn)
                     filecontent[fn] = "r%i\n" % id
                     if len(ps) > 1:
                         if not p2:
                             p2 = repo[ps[1]]
                         for fn in p2:
                             if fn.startswith("nf"):
                                 files.append(fn)
                                 filecontent[fn] = p2[fn].data()
 
                 def fctxfn(repo, cx, path):
                     if path in filecontent:
                         return context.memfilectx(repo, cx, path,
                                                   filecontent[path])
                     return None
 
                 if len(ps) == 0 or ps[0] < 0:
                     pars = [None, None]
                 elif len(ps) == 1:
                     pars = [nodeids[ps[0]], None]
                 else:
                     pars = [nodeids[p] for p in ps]
                 cx = context.memctx(repo, pars, "r%i" % id, files, fctxfn,
                                     date=(id, 0),
                                     user="debugbuilddag",
                                     extra={'branch': atbranch})
                 nodeid = repo.commitctx(cx)
                 nodeids.append(nodeid)
                 at = id
             elif type == 'l':
                 id, name = data
                 ui.note(('tag %s\n' % name))
                 tags.append("%s %s\n" % (hex(repo.changelog.node(id)), name))
             elif type == 'a':
                 ui.note(('branch %s\n' % data))
                 atbranch = data
             progress.update(id)
 
         if tags:
             repo.vfs.write("localtags", "".join(tags))
 
 def _debugchangegroup(ui, gen, all=None, indent=0, **opts):
     indent_string = ' ' * indent
     if all:
         ui.write(("%sformat: id, p1, p2, cset, delta base, len(delta)\n")
                  % indent_string)
 
         def showchunks(named):
             ui.write("\n%s%s\n" % (indent_string, named))
             for deltadata in gen.deltaiter():
                 node, p1, p2, cs, deltabase, delta, flags = deltadata
                 ui.write("%s%s %s %s %s %s %d\n" %
                          (indent_string, hex(node), hex(p1), hex(p2),
                           hex(cs), hex(deltabase), len(delta)))
 
         chunkdata = gen.changelogheader()
         showchunks("changelog")
         chunkdata = gen.manifestheader()
         showchunks("manifest")
         for chunkdata in iter(gen.filelogheader, {}):
             fname = chunkdata['filename']
             showchunks(fname)
     else:
         if isinstance(gen, bundle2.unbundle20):
             raise error.Abort(_('use debugbundle2 for this file'))
         chunkdata = gen.changelogheader()
         for deltadata in gen.deltaiter():
             node, p1, p2, cs, deltabase, delta, flags = deltadata
             ui.write("%s%s\n" % (indent_string, hex(node)))
 
 def _debugobsmarkers(ui, part, indent=0, **opts):
     """display version and markers contained in 'data'"""
     opts = pycompat.byteskwargs(opts)
     data = part.read()
     indent_string = ' ' * indent
     try:
         version, markers = obsolete._readmarkers(data)
     except error.UnknownVersion as exc:
         msg = "%sunsupported version: %s (%d bytes)\n"
         msg %= indent_string, exc.version, len(data)
         ui.write(msg)
     else:
         msg = "%sversion: %d (%d bytes)\n"
         msg %= indent_string, version, len(data)
         ui.write(msg)
         fm = ui.formatter('debugobsolete', opts)
         for rawmarker in sorted(markers):
             m = obsutil.marker(None, rawmarker)
             fm.startitem()
             fm.plain(indent_string)
             cmdutil.showmarker(fm, m)
         fm.end()
 
 def _debugphaseheads(ui, data, indent=0):
     """display version and markers contained in 'data'"""
     indent_string = ' ' * indent
     headsbyphase = phases.binarydecode(data)
     for phase in phases.allphases:
         for head in headsbyphase[phase]:
             ui.write(indent_string)
             ui.write('%s %s\n' % (hex(head), phases.phasenames[phase]))
 
 def _quasirepr(thing):
     if isinstance(thing, (dict, util.sortdict, collections.OrderedDict)):
         return '{%s}' % (
             b', '.join(b'%s: %s' % (k, thing[k]) for k in sorted(thing)))
     return pycompat.bytestr(repr(thing))
 
 def _debugbundle2(ui, gen, all=None, **opts):
     """lists the contents of a bundle2"""
     if not isinstance(gen, bundle2.unbundle20):
         raise error.Abort(_('not a bundle2 file'))
     ui.write(('Stream params: %s\n' % _quasirepr(gen.params)))
     parttypes = opts.get(r'part_type', [])
     for part in gen.iterparts():
         if parttypes and part.type not in parttypes:
             continue
         msg = '%s -- %s (mandatory: %r)\n'
         ui.write((msg % (part.type, _quasirepr(part.params), part.mandatory)))
         if part.type == 'changegroup':
             version = part.params.get('version', '01')
             cg = changegroup.getunbundler(version, part, 'UN')
             if not ui.quiet:
                 _debugchangegroup(ui, cg, all=all, indent=4, **opts)
         if part.type == 'obsmarkers':
             if not ui.quiet:
                 _debugobsmarkers(ui, part, indent=4, **opts)
         if part.type == 'phase-heads':
             if not ui.quiet:
                 _debugphaseheads(ui, part, indent=4)
 
 @command('debugbundle',
         [('a', 'all', None, _('show all details')),
          ('', 'part-type', [], _('show only the named part type')),
          ('', 'spec', None, _('print the bundlespec of the bundle'))],
         _('FILE'),
         norepo=True)
 def debugbundle(ui, bundlepath, all=None, spec=None, **opts):
     """lists the contents of a bundle"""
     with hg.openpath(ui, bundlepath) as f:
         if spec:
             spec = exchange.getbundlespec(ui, f)
             ui.write('%s\n' % spec)
             return
 
         gen = exchange.readbundle(ui, f, bundlepath)
         if isinstance(gen, bundle2.unbundle20):
             return _debugbundle2(ui, gen, all=all, **opts)
         _debugchangegroup(ui, gen, all=all, **opts)
 
 @command('debugcapabilities',
         [], _('PATH'),
         norepo=True)
 def debugcapabilities(ui, path, **opts):
     """lists the capabilities of a remote peer"""
     opts = pycompat.byteskwargs(opts)
     peer = hg.peer(ui, opts, path)
     caps = peer.capabilities()
     ui.write(('Main capabilities:\n'))
     for c in sorted(caps):
         ui.write(('  %s\n') % c)
     b2caps = bundle2.bundle2caps(peer)
     if b2caps:
         ui.write(('Bundle2 capabilities:\n'))
         for key, values in sorted(b2caps.iteritems()):
             ui.write(('  %s\n') % key)
             for v in values:
                 ui.write(('    %s\n') % v)
 
 @command('debugcheckstate', [], '')
 def debugcheckstate(ui, repo):
     """validate the correctness of the current dirstate"""
     parent1, parent2 = repo.dirstate.parents()
     m1 = repo[parent1].manifest()
     m2 = repo[parent2].manifest()
     errors = 0
     for f in repo.dirstate:
         state = repo.dirstate[f]
         if state in "nr" and f not in m1:
             ui.warn(_("%s in state %s, but not in manifest1\n") % (f, state))
             errors += 1
         if state in "a" and f in m1:
             ui.warn(_("%s in state %s, but also in manifest1\n") % (f, state))
             errors += 1
         if state in "m" and f not in m1 and f not in m2:
             ui.warn(_("%s in state %s, but not in either manifest\n") %
                     (f, state))
             errors += 1
     for f in m1:
         state = repo.dirstate[f]
         if state not in "nrm":
             ui.warn(_("%s in manifest1, but listed as state %s") % (f, state))
             errors += 1
     if errors:
         error = _(".hg/dirstate inconsistent with current parent's manifest")
         raise error.Abort(error)
 
 @command('debugcolor',
         [('', 'style', None, _('show all configured styles'))],
         'hg debugcolor')
 def debugcolor(ui, repo, **opts):
     """show available color, effects or style"""
     ui.write(('color mode: %s\n') % stringutil.pprint(ui._colormode))
     if opts.get(r'style'):
         return _debugdisplaystyle(ui)
     else:
         return _debugdisplaycolor(ui)
 
 def _debugdisplaycolor(ui):
     ui = ui.copy()
     ui._styles.clear()
     for effect in color._activeeffects(ui).keys():
         ui._styles[effect] = effect
     if ui._terminfoparams:
         for k, v in ui.configitems('color'):
             if k.startswith('color.'):
                 ui._styles[k] = k[6:]
             elif k.startswith('terminfo.'):
                 ui._styles[k] = k[9:]
     ui.write(_('available colors:\n'))
     # sort label with a '_' after the other to group '_background' entry.
     items = sorted(ui._styles.items(),
                    key=lambda i: ('_' in i[0], i[0], i[1]))
     for colorname, label in items:
         ui.write(('%s\n') % colorname, label=label)
 
 def _debugdisplaystyle(ui):
     ui.write(_('available style:\n'))
     if not ui._styles:
         return
     width = max(len(s) for s in ui._styles)
     for label, effects in sorted(ui._styles.items()):
         ui.write('%s' % label, label=label)
         if effects:
             # 50
             ui.write(': ')
             ui.write(' ' * (max(0, width - len(label))))
             ui.write(', '.join(ui.label(e, e) for e in effects.split()))
         ui.write('\n')
 
 @command('debugcreatestreamclonebundle', [], 'FILE')
 def debugcreatestreamclonebundle(ui, repo, fname):
     """create a stream clone bundle file
 
     Stream bundles are special bundles that are essentially archives of
     revlog files. They are commonly used for cloning very quickly.
     """
     # TODO we may want to turn this into an abort when this functionality
     # is moved into `hg bundle`.
     if phases.hassecret(repo):
         ui.warn(_('(warning: stream clone bundle will contain secret '
                   'revisions)\n'))
 
     requirements, gen = streamclone.generatebundlev1(repo)
     changegroup.writechunks(ui, gen, fname)
 
     ui.write(_('bundle requirements: %s\n') % ', '.join(sorted(requirements)))
 
 @command('debugdag',
     [('t', 'tags', None, _('use tags as labels')),
     ('b', 'branches', None, _('annotate with branch names')),
     ('', 'dots', None, _('use dots for runs')),
     ('s', 'spaces', None, _('separate elements by spaces'))],
     _('[OPTION]... [FILE [REV]...]'),
     optionalrepo=True)
 def debugdag(ui, repo, file_=None, *revs, **opts):
     """format the changelog or an index DAG as a concise textual description
 
     If you pass a revlog index, the revlog's DAG is emitted. If you list
     revision numbers, they get labeled in the output as rN.
 
     Otherwise, the changelog DAG of the current repo is emitted.
     """
     spaces = opts.get(r'spaces')
     dots = opts.get(r'dots')
     if file_:
         rlog = revlog.revlog(vfsmod.vfs(encoding.getcwd(), audit=False),
                              file_)
         revs = set((int(r) for r in revs))
         def events():
             for r in rlog:
                 yield 'n', (r, list(p for p in rlog.parentrevs(r)
                                         if p != -1))
                 if r in revs:
                     yield 'l', (r, "r%i" % r)
     elif repo:
         cl = repo.changelog
         tags = opts.get(r'tags')
         branches = opts.get(r'branches')
         if tags:
             labels = {}
             for l, n in repo.tags().items():
                 labels.setdefault(cl.rev(n), []).append(l)
         def events():
             b = "default"
             for r in cl:
                 if branches:
                     newb = cl.read(cl.node(r))[5]['branch']
                     if newb != b:
                         yield 'a', newb
                         b = newb
                 yield 'n', (r, list(p for p in cl.parentrevs(r)
                                         if p != -1))
                 if tags:
                     ls = labels.get(r)
                     if ls:
                         for l in ls:
                             yield 'l', (r, l)
     else:
         raise error.Abort(_('need repo for changelog dag'))
 
     for line in dagparser.dagtextlines(events(),
                                        addspaces=spaces,
                                        wraplabels=True,
                                        wrapannotations=True,
                                        wrapnonlinear=dots,
                                        usedots=dots,
                                        maxlinewidth=70):
         ui.write(line)
         ui.write("\n")
 
 @command('debugdata', cmdutil.debugrevlogopts, _('-c|-m|FILE REV'))
 def debugdata(ui, repo, file_, rev=None, **opts):
     """dump the contents of a data file revision"""
     opts = pycompat.byteskwargs(opts)
     if opts.get('changelog') or opts.get('manifest') or opts.get('dir'):
         if rev is not None:
             raise error.CommandError('debugdata', _('invalid arguments'))
         file_, rev = None, file_
     elif rev is None:
         raise error.CommandError('debugdata', _('invalid arguments'))
     r = cmdutil.openstorage(repo, 'debugdata', file_, opts)
     try:
         ui.write(r.revision(r.lookup(rev), raw=True))
     except KeyError:
         raise error.Abort(_('invalid revision identifier %s') % rev)
 
 @command('debugdate',
     [('e', 'extended', None, _('try extended date formats'))],
     _('[-e] DATE [RANGE]'),
     norepo=True, optionalrepo=True)
 def debugdate(ui, date, range=None, **opts):
     """parse and display a date"""
     if opts[r"extended"]:
         d = dateutil.parsedate(date, util.extendeddateformats)
     else:
         d = dateutil.parsedate(date)
     ui.write(("internal: %d %d\n") % d)
     ui.write(("standard: %s\n") % dateutil.datestr(d))
     if range:
         m = dateutil.matchdate(range)
         ui.write(("match: %s\n") % m(d[0]))
 
 @command('debugdeltachain',
     cmdutil.debugrevlogopts + cmdutil.formatteropts,
     _('-c|-m|FILE'),
     optionalrepo=True)
 def debugdeltachain(ui, repo, file_=None, **opts):
     """dump information about delta chains in a revlog
 
     Output can be templatized. Available template keywords are:
 
     :``rev``:       revision number
     :``chainid``:   delta chain identifier (numbered by unique base)
     :``chainlen``:  delta chain length to this revision
     :``prevrev``:   previous revision in delta chain
     :``deltatype``: role of delta / how it was computed
     :``compsize``:  compressed size of revision
     :``uncompsize``: uncompressed size of revision
     :``chainsize``: total size of compressed revisions in chain
     :``chainratio``: total chain size divided by uncompressed revision size
                     (new delta chains typically start at ratio 2.00)
     :``lindist``:   linear distance from base revision in delta chain to end
                     of this revision
     :``extradist``: total size of revisions not part of this delta chain from
                     base of delta chain to end of this revision; a measurement
                     of how much extra data we need to read/seek across to read
                     the delta chain for this revision
     :``extraratio``: extradist divided by chainsize; another representation of
                     how much unrelated data is needed to load this delta chain
 
     If the repository is configured to use the sparse read, additional keywords
     are available:
 
     :``readsize``:     total size of data read from the disk for a revision
                        (sum of the sizes of all the blocks)
     :``largestblock``: size of the largest block of data read from the disk
     :``readdensity``:  density of useful bytes in the data read from the disk
     :``srchunks``:  in how many data hunks the whole revision would be read
 
     The sparse read can be enabled with experimental.sparse-read = True
     """
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, 'debugdeltachain', file_, opts)
     index = r.index
     start = r.start
     length = r.length
     generaldelta = r.version & revlog.FLAG_GENERALDELTA
     withsparseread = getattr(r, '_withsparseread', False)
 
     def revinfo(rev):
         e = index[rev]
         compsize = e[1]
         uncompsize = e[2]
         chainsize = 0
 
         if generaldelta:
             if e[3] == e[5]:
                 deltatype = 'p1'
             elif e[3] == e[6]:
                 deltatype = 'p2'
             elif e[3] == rev - 1:
                 deltatype = 'prev'
             elif e[3] == rev:
                 deltatype = 'base'
             else:
                 deltatype = 'other'
         else:
             if e[3] == rev:
                 deltatype = 'base'
             else:
                 deltatype = 'prev'
 
         chain = r._deltachain(rev)[0]
         for iterrev in chain:
             e = index[iterrev]
             chainsize += e[1]
 
         return compsize, uncompsize, deltatype, chain, chainsize
 
     fm = ui.formatter('debugdeltachain', opts)
 
     fm.plain('    rev  chain# chainlen     prev   delta       '
              'size    rawsize  chainsize     ratio   lindist extradist '
              'extraratio')
     if withsparseread:
         fm.plain('   readsize largestblk rddensity srchunks')
     fm.plain('\n')
 
     chainbases = {}
     for rev in r:
         comp, uncomp, deltatype, chain, chainsize = revinfo(rev)
         chainbase = chain[0]
         chainid = chainbases.setdefault(chainbase, len(chainbases) + 1)
         basestart = start(chainbase)
         revstart = start(rev)
         lineardist = revstart + comp - basestart
         extradist = lineardist - chainsize
         try:
             prevrev = chain[-2]
         except IndexError:
             prevrev = -1
 
         if uncomp != 0:
             chainratio = float(chainsize) / float(uncomp)
         else:
             chainratio = chainsize
 
         if chainsize != 0:
             extraratio = float(extradist) / float(chainsize)
         else:
             extraratio = extradist
 
         fm.startitem()
         fm.write('rev chainid chainlen prevrev deltatype compsize '
                  'uncompsize chainsize chainratio lindist extradist '
                  'extraratio',
                  '%7d %7d %8d %8d %7s %10d %10d %10d %9.5f %9d %9d %10.5f',
                  rev, chainid, len(chain), prevrev, deltatype, comp,
                  uncomp, chainsize, chainratio, lineardist, extradist,
                  extraratio,
                  rev=rev, chainid=chainid, chainlen=len(chain),
                  prevrev=prevrev, deltatype=deltatype, compsize=comp,
                  uncompsize=uncomp, chainsize=chainsize,
                  chainratio=chainratio, lindist=lineardist,
                  extradist=extradist, extraratio=extraratio)
         if withsparseread:
             readsize = 0
             largestblock = 0
             srchunks = 0
 
             for revschunk in deltautil.slicechunk(r, chain):
                 srchunks += 1
                 blkend = start(revschunk[-1]) + length(revschunk[-1])
                 blksize = blkend - start(revschunk[0])
 
                 readsize += blksize
                 if largestblock < blksize:
                     largestblock = blksize
 
             if readsize:
                 readdensity = float(chainsize) / float(readsize)
             else:
                 readdensity = 1
 
             fm.write('readsize largestblock readdensity srchunks',
                      ' %10d %10d %9.5f %8d',
                      readsize, largestblock, readdensity, srchunks,
                      readsize=readsize, largestblock=largestblock,
                      readdensity=readdensity, srchunks=srchunks)
 
         fm.plain('\n')
 
     fm.end()
 
 @command('debugdirstate|debugstate',
     [('', 'nodates', None, _('do not display the saved mtime (DEPRECATED)')),
      ('', 'dates', True, _('display the saved mtime')),
      ('', 'datesort', None, _('sort by saved mtime'))],
     _('[OPTION]...'))
 def debugstate(ui, repo, **opts):
     """show the contents of the current dirstate"""
 
     nodates = not opts[r'dates']
     if opts.get(r'nodates') is not None:
         nodates = True
     datesort = opts.get(r'datesort')
 
     if datesort:
         keyfunc = lambda x: (x[1][3], x[0]) # sort by mtime, then by filename
     else:
         keyfunc = None # sort by filename
     for file_, ent in sorted(repo.dirstate._map.iteritems(), key=keyfunc):
         if ent[3] == -1:
             timestr = 'unset               '
         elif nodates:
             timestr = 'set                 '
         else:
             timestr = time.strftime(r"%Y-%m-%d %H:%M:%S ",
                                     time.localtime(ent[3]))
             timestr = encoding.strtolocal(timestr)
         if ent[1] & 0o20000:
             mode = 'lnk'
         else:
             mode = '%3o' % (ent[1] & 0o777 & ~util.umask)
         ui.write("%c %s %10d %s%s\n" % (ent[0], mode, ent[2], timestr, file_))
     for f in repo.dirstate.copies():
         ui.write(_("copy: %s -> %s\n") % (repo.dirstate.copied(f), f))
 
 @command('debugdiscovery',
     [('', 'old', None, _('use old-style discovery')),
     ('', 'nonheads', None,
      _('use old-style discovery with non-heads included')),
     ('', 'rev', [], 'restrict discovery to this set of revs'),
     ('', 'seed', '12323', 'specify the random seed use for discovery'),
     ] + cmdutil.remoteopts,
     _('[--rev REV] [OTHER]'))
 def debugdiscovery(ui, repo, remoteurl="default", **opts):
     """runs the changeset discovery protocol in isolation"""
     opts = pycompat.byteskwargs(opts)
     remoteurl, branches = hg.parseurl(ui.expandpath(remoteurl))
     remote = hg.peer(repo, opts, remoteurl)
     ui.status(_('comparing with %s\n') % util.hidepassword(remoteurl))
 
     # make sure tests are repeatable
     random.seed(int(opts['seed']))
 
 
 
     if opts.get('old'):
         def doit(pushedrevs, remoteheads, remote=remote):
             if not util.safehasattr(remote, 'branches'):
                 # enable in-client legacy support
                 remote = localrepo.locallegacypeer(remote.local())
             common, _in, hds = treediscovery.findcommonincoming(repo, remote,
                                                                 force=True)
             common = set(common)
             if not opts.get('nonheads'):
                 ui.write(("unpruned common: %s\n") %
                          " ".join(sorted(short(n) for n in common)))
 
                 clnode = repo.changelog.node
                 common = repo.revs('heads(::%ln)', common)
                 common = {clnode(r) for r in common}
             return common, hds
     else:
         def doit(pushedrevs, remoteheads, remote=remote):
             nodes = None
             if pushedrevs:
                 revs = scmutil.revrange(repo, pushedrevs)
                 nodes = [repo[r].node() for r in revs]
             common, any, hds = setdiscovery.findcommonheads(ui, repo, remote,
                                                             ancestorsof=nodes)
             return common, hds
 
     remoterevs, _checkout = hg.addbranchrevs(repo, remote, branches, revs=None)
     localrevs = opts['rev']
     with util.timedcm('debug-discovery') as t:
         common, hds = doit(localrevs, remoterevs)
 
     # compute all statistics
     common = set(common)
     rheads = set(hds)
     lheads = set(repo.heads())
 
     data = {}
     data['elapsed'] = t.elapsed
     data['nb-common'] = len(common)
     data['nb-common-local'] = len(common & lheads)
     data['nb-common-remote'] = len(common & rheads)
     data['nb-common-both'] = len(common & rheads & lheads)
     data['nb-local'] = len(lheads)
     data['nb-local-missing'] = data['nb-local'] - data['nb-common-local']
     data['nb-remote'] = len(rheads)
     data['nb-remote-unknown'] = data['nb-remote'] - data['nb-common-remote']
     data['nb-revs'] = len(repo.revs('all()'))
     data['nb-revs-common'] = len(repo.revs('::%ln', common))
     data['nb-revs-missing'] = data['nb-revs'] - data['nb-revs-common']
 
     # display discovery summary
     ui.write(("elapsed time:  %(elapsed)f seconds\n") % data)
     ui.write(("heads summary:\n"))
     ui.write(("  total common heads:  %(nb-common)9d\n") % data)
     ui.write(("    also local heads:  %(nb-common-local)9d\n") % data)
     ui.write(("    also remote heads: %(nb-common-remote)9d\n") % data)
     ui.write(("    both:              %(nb-common-both)9d\n") % data)
     ui.write(("  local heads:         %(nb-local)9d\n") % data)
     ui.write(("    common:            %(nb-common-local)9d\n") % data)
     ui.write(("    missing:           %(nb-local-missing)9d\n") % data)
     ui.write(("  remote heads:        %(nb-remote)9d\n") % data)
     ui.write(("    common:            %(nb-common-remote)9d\n") % data)
     ui.write(("    unknown:           %(nb-remote-unknown)9d\n") % data)
     ui.write(("local changesets:      %(nb-revs)9d\n") % data)
     ui.write(("  common:              %(nb-revs-common)9d\n") % data)
     ui.write(("  missing:             %(nb-revs-missing)9d\n") % data)
 
     if ui.verbose:
         ui.write(("common heads: %s\n") %
                  " ".join(sorted(short(n) for n in common)))
 
 _chunksize = 4 << 10
 
 @command('debugdownload',
     [
         ('o', 'output', '', _('path')),
     ],
     optionalrepo=True)
 def debugdownload(ui, repo, url, output=None, **opts):
     """download a resource using Mercurial logic and config
     """
     fh = urlmod.open(ui, url, output)
 
     dest = ui
     if output:
         dest = open(output, "wb", _chunksize)
     try:
         data = fh.read(_chunksize)
         while data:
             dest.write(data)
             data = fh.read(_chunksize)
     finally:
         if output:
             dest.close()
 
 @command('debugextensions', cmdutil.formatteropts, [], optionalrepo=True)
 def debugextensions(ui, repo, **opts):
     '''show information about active extensions'''
     opts = pycompat.byteskwargs(opts)
     exts = extensions.extensions(ui)
     hgver = util.version()
     fm = ui.formatter('debugextensions', opts)
     for extname, extmod in sorted(exts, key=operator.itemgetter(0)):
         isinternal = extensions.ismoduleinternal(extmod)
         extsource = pycompat.fsencode(extmod.__file__)
         if isinternal:
             exttestedwith = []  # never expose magic string to users
         else:
             exttestedwith = getattr(extmod, 'testedwith', '').split()
         extbuglink = getattr(extmod, 'buglink', None)
 
         fm.startitem()
 
         if ui.quiet or ui.verbose:
             fm.write('name', '%s\n', extname)
         else:
             fm.write('name', '%s', extname)
             if isinternal or hgver in exttestedwith:
                 fm.plain('\n')
             elif not exttestedwith:
                 fm.plain(_(' (untested!)\n'))
             else:
                 lasttestedversion = exttestedwith[-1]
                 fm.plain(' (%s!)\n' % lasttestedversion)
 
         fm.condwrite(ui.verbose and extsource, 'source',
                  _('  location: %s\n'), extsource or "")
 
         if ui.verbose:
             fm.plain(_('  bundled: %s\n') % ['no', 'yes'][isinternal])
         fm.data(bundled=isinternal)
 
         fm.condwrite(ui.verbose and exttestedwith, 'testedwith',
                      _('  tested with: %s\n'),
                      fm.formatlist(exttestedwith, name='ver'))
 
         fm.condwrite(ui.verbose and extbuglink, 'buglink',
                  _('  bug reporting: %s\n'), extbuglink or "")
 
     fm.end()
 
 @command('debugfileset',
     [('r', 'rev', '', _('apply the filespec on this revision'), _('REV')),
      ('', 'all-files', False,
       _('test files from all revisions and working directory')),
      ('s', 'show-matcher', None,
       _('print internal representation of matcher')),
      ('p', 'show-stage', [],
       _('print parsed tree at the given stage'), _('NAME'))],
     _('[-r REV] [--all-files] [OPTION]... FILESPEC'))
 def debugfileset(ui, repo, expr, **opts):
     '''parse and apply a fileset specification'''
     from . import fileset
     fileset.symbols # force import of fileset so we have predicates to optimize
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get('rev'), None)
 
     stages = [
         ('parsed', pycompat.identity),
         ('analyzed', filesetlang.analyze),
         ('optimized', filesetlang.optimize),
     ]
     stagenames = set(n for n, f in stages)
 
     showalways = set()
     if ui.verbose and not opts['show_stage']:
         # show parsed tree by --verbose (deprecated)
         showalways.add('parsed')
     if opts['show_stage'] == ['all']:
         showalways.update(stagenames)
     else:
         for n in opts['show_stage']:
             if n not in stagenames:
                 raise error.Abort(_('invalid stage name: %s') % n)
         showalways.update(opts['show_stage'])
 
     tree = filesetlang.parse(expr)
     for n, f in stages:
         tree = f(tree)
         if n in showalways:
             if opts['show_stage'] or n != 'parsed':
                 ui.write(("* %s:\n") % n)
             ui.write(filesetlang.prettyformat(tree), "\n")
 
     files = set()
     if opts['all_files']:
         for r in repo:
             c = repo[r]
             files.update(c.files())
             files.update(c.substate)
     if opts['all_files'] or ctx.rev() is None:
         wctx = repo[None]
         files.update(repo.dirstate.walk(scmutil.matchall(repo),
                                         subrepos=list(wctx.substate),
                                         unknown=True, ignored=True))
         files.update(wctx.substate)
     else:
         files.update(ctx.files())
         files.update(ctx.substate)
 
     m = ctx.matchfileset(expr)
     if opts['show_matcher'] or (opts['show_matcher'] is None and ui.verbose):
         ui.write(('* matcher:\n'), stringutil.prettyrepr(m), '\n')
     for f in sorted(files):
         if not m(f):
             continue
         ui.write("%s\n" % f)
 
 @command('debugformat',
          [] + cmdutil.formatteropts)
 def debugformat(ui, repo, **opts):
     """display format information about the current repository
 
     Use --verbose to get extra information about current config value and
     Mercurial default."""
     opts = pycompat.byteskwargs(opts)
     maxvariantlength = max(len(fv.name) for fv in upgrade.allformatvariant)
     maxvariantlength = max(len('format-variant'), maxvariantlength)
 
     def makeformatname(name):
         return '%s:' + (' ' * (maxvariantlength - len(name)))
 
     fm = ui.formatter('debugformat', opts)
     if fm.isplain():
         def formatvalue(value):
             if util.safehasattr(value, 'startswith'):
                 return value
             if value:
                 return 'yes'
             else:
                 return 'no'
     else:
         formatvalue = pycompat.identity
 
     fm.plain('format-variant')
     fm.plain(' ' * (maxvariantlength - len('format-variant')))
     fm.plain(' repo')
     if ui.verbose:
         fm.plain(' config default')
     fm.plain('\n')
     for fv in upgrade.allformatvariant:
         fm.startitem()
         repovalue = fv.fromrepo(repo)
         configvalue = fv.fromconfig(repo)
 
         if repovalue != configvalue:
             namelabel = 'formatvariant.name.mismatchconfig'
             repolabel = 'formatvariant.repo.mismatchconfig'
         elif repovalue != fv.default:
             namelabel = 'formatvariant.name.mismatchdefault'
             repolabel = 'formatvariant.repo.mismatchdefault'
         else:
             namelabel = 'formatvariant.name.uptodate'
             repolabel = 'formatvariant.repo.uptodate'
 
         fm.write('name', makeformatname(fv.name), fv.name,
                  label=namelabel)
         fm.write('repo', ' %3s', formatvalue(repovalue),
                  label=repolabel)
         if fv.default != configvalue:
             configlabel = 'formatvariant.config.special'
         else:
             configlabel = 'formatvariant.config.default'
         fm.condwrite(ui.verbose, 'config', ' %6s', formatvalue(configvalue),
                      label=configlabel)
         fm.condwrite(ui.verbose, 'default', ' %7s', formatvalue(fv.default),
                      label='formatvariant.default')
         fm.plain('\n')
     fm.end()
 
 @command('debugfsinfo', [], _('[PATH]'), norepo=True)
 def debugfsinfo(ui, path="."):
     """show information detected about current filesystem"""
     ui.write(('path: %s\n') % path)
     ui.write(('mounted on: %s\n') % (util.getfsmountpoint(path) or '(unknown)'))
     ui.write(('exec: %s\n') % (util.checkexec(path) and 'yes' or 'no'))
     ui.write(('fstype: %s\n') % (util.getfstype(path) or '(unknown)'))
     ui.write(('symlink: %s\n') % (util.checklink(path) and 'yes' or 'no'))
     ui.write(('hardlink: %s\n') % (util.checknlink(path) and 'yes' or 'no'))
     casesensitive = '(unknown)'
     try:
         with pycompat.namedtempfile(prefix='.debugfsinfo', dir=path) as f:
             casesensitive = util.fscasesensitive(f.name) and 'yes' or 'no'
     except OSError:
         pass
     ui.write(('case-sensitive: %s\n') % casesensitive)
 
 @command('debuggetbundle',
     [('H', 'head', [], _('id of head node'), _('ID')),
     ('C', 'common', [], _('id of common node'), _('ID')),
     ('t', 'type', 'bzip2', _('bundle compression type to use'), _('TYPE'))],
     _('REPO FILE [-H|-C ID]...'),
     norepo=True)
 def debuggetbundle(ui, repopath, bundlepath, head=None, common=None, **opts):
     """retrieves a bundle from a repo
 
     Every ID must be a full-length hex node id string. Saves the bundle to the
     given file.
     """
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable('getbundle'):
         raise error.Abort("getbundle() not supported by target repository")
     args = {}
     if common:
         args[r'common'] = [bin(s) for s in common]
     if head:
         args[r'heads'] = [bin(s) for s in head]
     # TODO: get desired bundlecaps from command line.
     args[r'bundlecaps'] = None
     bundle = repo.getbundle('debug', **args)
 
     bundletype = opts.get('type', 'bzip2').lower()
     btypes = {'none': 'HG10UN',
               'bzip2': 'HG10BZ',
               'gzip': 'HG10GZ',
               'bundle2': 'HG20'}
     bundletype = btypes.get(bundletype)
     if bundletype not in bundle2.bundletypes:
         raise error.Abort(_('unknown bundle type specified with --type'))
     bundle2.writebundle(ui, bundle, bundlepath, bundletype)
 
 @command('debugignore', [], '[FILE]')
 def debugignore(ui, repo, *files, **opts):
     """display the combined ignore pattern and information about ignored files
 
     With no argument display the combined ignore pattern.
 
     Given space separated file names, shows if the given file is ignored and
     if so, show the ignore rule (file and line number) that matched it.
     """
     ignore = repo.dirstate._ignore
     if not files:
         # Show all the patterns
         ui.write("%s\n" % pycompat.byterepr(ignore))
     else:
         m = scmutil.match(repo[None], pats=files)
         uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
         for f in m.files():
             nf = util.normpath(f)
             ignored = None
             ignoredata = None
             if nf != '.':
                 if ignore(nf):
                     ignored = nf
                     ignoredata = repo.dirstate._ignorefileandline(nf)
                 else:
                     for p in util.finddirs(nf):
                         if ignore(p):
                             ignored = p
                             ignoredata = repo.dirstate._ignorefileandline(p)
                             break
             if ignored:
                 if ignored == nf:
                     ui.write(_("%s is ignored\n") % uipathfn(f))
                 else:
                     ui.write(_("%s is ignored because of "
                                "containing directory %s\n")
                              % (uipathfn(f), ignored))
                 ignorefile, lineno, line = ignoredata
                 ui.write(_("(ignore rule in %s, line %d: '%s')\n")
                          % (ignorefile, lineno, line))
             else:
                 ui.write(_("%s is not ignored\n") % uipathfn(f))
 
 @command('debugindex', cmdutil.debugrevlogopts + cmdutil.formatteropts,
          _('-c|-m|FILE'))
 def debugindex(ui, repo, file_=None, **opts):
     """dump index data for a storage primitive"""
     opts = pycompat.byteskwargs(opts)
     store = cmdutil.openstorage(repo, 'debugindex', file_, opts)
 
     if ui.debugflag:
         shortfn = hex
     else:
         shortfn = short
 
     idlen = 12
     for i in store:
         idlen = len(shortfn(store.node(i)))
         break
 
     fm = ui.formatter('debugindex', opts)
     fm.plain(b'   rev linkrev %s %s p2\n' % (
         b'nodeid'.ljust(idlen),
         b'p1'.ljust(idlen)))
 
     for rev in store:
         node = store.node(rev)
         parents = store.parents(node)
 
         fm.startitem()
         fm.write(b'rev', b'%6d ', rev)
         fm.write(b'linkrev', '%7d ', store.linkrev(rev))
         fm.write(b'node', '%s ', shortfn(node))
         fm.write(b'p1', '%s ', shortfn(parents[0]))
         fm.write(b'p2', '%s', shortfn(parents[1]))
         fm.plain(b'\n')
 
     fm.end()
 
 @command('debugindexdot', cmdutil.debugrevlogopts,
     _('-c|-m|FILE'), optionalrepo=True)
 def debugindexdot(ui, repo, file_=None, **opts):
     """dump an index DAG as a graphviz dot file"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openstorage(repo, 'debugindexdot', file_, opts)
     ui.write(("digraph G {\n"))
     for i in r:
         node = r.node(i)
         pp = r.parents(node)
         ui.write("\t%d -> %d\n" % (r.rev(pp[0]), i))
         if pp[1] != nullid:
             ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
     ui.write("}\n")
 
 @command('debugindexstats', [])
 def debugindexstats(ui, repo):
     """show stats related to the changelog index"""
     repo.changelog.shortest(nullid, 1)
     index = repo.changelog.index
     if not util.safehasattr(index, 'stats'):
         raise error.Abort(_('debugindexstats only works with native code'))
     for k, v in sorted(index.stats().items()):
         ui.write('%s: %d\n' % (k, v))
 
 @command('debuginstall', [] + cmdutil.formatteropts, '', norepo=True)
 def debuginstall(ui, **opts):
     '''test Mercurial installation
 
     Returns 0 on success.
     '''
     opts = pycompat.byteskwargs(opts)
 
     problems = 0
 
     fm = ui.formatter('debuginstall', opts)
     fm.startitem()
 
     # encoding
     fm.write('encoding', _("checking encoding (%s)...\n"), encoding.encoding)
     err = None
     try:
         codecs.lookup(pycompat.sysstr(encoding.encoding))
     except LookupError as inst:
         err = stringutil.forcebytestr(inst)
         problems += 1
     fm.condwrite(err, 'encodingerror', _(" %s\n"
                  " (check that your locale is properly set)\n"), err)
 
     # Python
     fm.write('pythonexe', _("checking Python executable (%s)\n"),
-             pycompat.sysexecutable)
+             pycompat.sysexecutable or _("unknown"))
     fm.write('pythonver', _("checking Python version (%s)\n"),
              ("%d.%d.%d" % sys.version_info[:3]))
     fm.write('pythonlib', _("checking Python lib (%s)...\n"),
              os.path.dirname(pycompat.fsencode(os.__file__)))
 
     security = set(sslutil.supportedprotocols)
     if sslutil.hassni:
         security.add('sni')
 
     fm.write('pythonsecurity', _("checking Python security support (%s)\n"),
              fm.formatlist(sorted(security), name='protocol',
                            fmt='%s', sep=','))
 
     # These are warnings, not errors. So don't increment problem count. This
     # may change in the future.
     if 'tls1.2' not in security:
         fm.plain(_('  TLS 1.2 not supported by Python install; '
                    'network connections lack modern security\n'))
     if 'sni' not in security:
         fm.plain(_('  SNI not supported by Python install; may have '
                    'connectivity issues with some servers\n'))
 
     # TODO print CA cert info
 
     # hg version
     hgver = util.version()
     fm.write('hgver', _("checking Mercurial version (%s)\n"),
              hgver.split('+')[0])
     fm.write('hgverextra', _("checking Mercurial custom build (%s)\n"),
              '+'.join(hgver.split('+')[1:]))
 
     # compiled modules
     fm.write('hgmodulepolicy', _("checking module policy (%s)\n"),
              policy.policy)
     fm.write('hgmodules', _("checking installed modules (%s)...\n"),
              os.path.dirname(pycompat.fsencode(__file__)))
 
     rustandc = policy.policy in ('rust+c', 'rust+c-allow')
     rustext = rustandc  # for now, that's the only case
     cext = policy.policy in ('c', 'allow') or rustandc
     nopure = cext or rustext
     if nopure:
         err = None
         try:
             if cext:
                 from .cext import (
                     base85,
                     bdiff,
                     mpatch,
                     osutil,
                 )
                 # quiet pyflakes
                 dir(bdiff), dir(mpatch), dir(base85), dir(osutil)
             if rustext:
                 from .rustext import (
                     ancestor,
                     dirstate,
                 )
                 dir(ancestor), dir(dirstate) # quiet pyflakes
         except Exception as inst:
             err = stringutil.forcebytestr(inst)
             problems += 1
         fm.condwrite(err, 'extensionserror', " %s\n", err)
 
     compengines = util.compengines._engines.values()
     fm.write('compengines', _('checking registered compression engines (%s)\n'),
              fm.formatlist(sorted(e.name() for e in compengines),
                            name='compengine', fmt='%s', sep=', '))
     fm.write('compenginesavail', _('checking available compression engines '
                                    '(%s)\n'),
              fm.formatlist(sorted(e.name() for e in compengines
                                   if e.available()),
                            name='compengine', fmt='%s', sep=', '))
     wirecompengines = compression.compengines.supportedwireengines(
         compression.SERVERROLE)
     fm.write('compenginesserver', _('checking available compression engines '
                                     'for wire protocol (%s)\n'),
              fm.formatlist([e.name() for e in wirecompengines
                             if e.wireprotosupport()],
                            name='compengine', fmt='%s', sep=', '))
     re2 = 'missing'
     if util._re2:
         re2 = 'available'
     fm.plain(_('checking "re2" regexp engine (%s)\n') % re2)
     fm.data(re2=bool(util._re2))
 
     # templates
     p = templater.templatepaths()
     fm.write('templatedirs', 'checking templates (%s)...\n', ' '.join(p))
     fm.condwrite(not p, '', _(" no template directories found\n"))
     if p:
         m = templater.templatepath("map-cmdline.default")
         if m:
             # template found, check if it is working
             err = None
             try:
                 templater.templater.frommapfile(m)
             except Exception as inst:
                 err = stringutil.forcebytestr(inst)
                 p = None
             fm.condwrite(err, 'defaulttemplateerror', " %s\n", err)
         else:
             p = None
         fm.condwrite(p, 'defaulttemplate',
                      _("checking default template (%s)\n"), m)
         fm.condwrite(not m, 'defaulttemplatenotfound',
                      _(" template '%s' not found\n"), "default")
     if not p:
         problems += 1
     fm.condwrite(not p, '',
                  _(" (templates seem to have been installed incorrectly)\n"))
 
     # editor
     editor = ui.geteditor()
     editor = util.expandpath(editor)
     editorbin = procutil.shellsplit(editor)[0]
     fm.write('editor', _("checking commit editor... (%s)\n"), editorbin)
     cmdpath = procutil.findexe(editorbin)
     fm.condwrite(not cmdpath and editor == 'vi', 'vinotfound',
                  _(" No commit editor set and can't find %s in PATH\n"
                    " (specify a commit editor in your configuration"
                    " file)\n"), not cmdpath and editor == 'vi' and editorbin)
     fm.condwrite(not cmdpath and editor != 'vi', 'editornotfound',
                  _(" Can't find editor '%s' in PATH\n"
                    " (specify a commit editor in your configuration"
                    " file)\n"), not cmdpath and editorbin)
     if not cmdpath and editor != 'vi':
         problems += 1
 
     # check username
     username = None
     err = None
     try:
         username = ui.username()
     except error.Abort as e:
         err = stringutil.forcebytestr(e)
         problems += 1
 
     fm.condwrite(username, 'username',  _("checking username (%s)\n"), username)
     fm.condwrite(err, 'usernameerror', _("checking username...\n %s\n"
         " (specify a username in your configuration file)\n"), err)
 
     fm.condwrite(not problems, '',
                  _("no problems detected\n"))
     if not problems:
         fm.data(problems=problems)
     fm.condwrite(problems, 'problems',
                  _("%d problems detected,"
                    " please check your install!\n"), problems)
     fm.end()
 
     return problems
 
 @command('debugknown', [], _('REPO ID...'), norepo=True)
 def debugknown(ui, repopath, *ids, **opts):
     """test whether node ids are known to a repo
 
     Every ID must be a full-length hex node id string. Returns a list of 0s
     and 1s indicating unknown/known.
     """
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable('known'):
         raise error.Abort("known() not supported by target repository")
     flags = repo.known([bin(s) for s in ids])
     ui.write("%s\n" % ("".join([f and "1" or "0" for f in flags])))
 
 @command('debuglabelcomplete', [], _('LABEL...'))
 def debuglabelcomplete(ui, repo, *args):
     '''backwards compatibility with old bash completion scripts (DEPRECATED)'''
     debugnamecomplete(ui, repo, *args)
 
 @command('debuglocks',
          [('L', 'force-lock', None, _('free the store lock (DANGEROUS)')),
           ('W', 'force-wlock', None,
            _('free the working state lock (DANGEROUS)')),
           ('s', 'set-lock', None, _('set the store lock until stopped')),
           ('S', 'set-wlock', None,
            _('set the working state lock until stopped'))],
          _('[OPTION]...'))
 def debuglocks(ui, repo, **opts):
     """show or modify state of locks
 
     By default, this command will show which locks are held. This
     includes the user and process holding the lock, the amount of time
     the lock has been held, and the machine name where the process is
     running if it's not local.
 
     Locks protect the integrity of Mercurial's data, so should be
     treated with care. System crashes or other interruptions may cause
     locks to not be properly released, though Mercurial will usually
     detect and remove such stale locks automatically.
 
     However, detecting stale locks may not always be possible (for
     instance, on a shared filesystem). Removing locks may also be
     blocked by filesystem permissions.
 
     Setting a lock will prevent other commands from changing the data.
     The command will wait until an interruption (SIGINT, SIGTERM, ...) occurs.
     The set locks are removed when the command exits.
 
     Returns 0 if no locks are held.
 
     """
 
     if opts.get(r'force_lock'):
         repo.svfs.unlink('lock')
     if opts.get(r'force_wlock'):
         repo.vfs.unlink('wlock')
     if opts.get(r'force_lock') or opts.get(r'force_wlock'):
         return 0
 
     locks = []
     try:
         if opts.get(r'set_wlock'):
             try:
                 locks.append(repo.wlock(False))
             except error.LockHeld:
                 raise error.Abort(_('wlock is already held'))
         if opts.get(r'set_lock'):
             try:
                 locks.append(repo.lock(False))
             except error.LockHeld:
                 raise error.Abort(_('lock is already held'))
         if len(locks):
             ui.promptchoice(_("ready to release the lock (y)? $$ &Yes"))
             return 0
     finally:
         release(*locks)
 
     now = time.time()
     held = 0
 
     def report(vfs, name, method):
         # this causes stale locks to get reaped for more accurate reporting
         try:
             l = method(False)
         except error.LockHeld:
             l = None
 
         if l:
             l.release()
         else:
             try:
                 st = vfs.lstat(name)
                 age = now - st[stat.ST_MTIME]
                 user = util.username(st.st_uid)
                 locker = vfs.readlock(name)
                 if ":" in locker:
                     host, pid = locker.split(':')
                     if host == socket.gethostname():
                         locker = 'user %s, process %s' % (user or b'None', pid)
                     else:
                         locker = ('user %s, process %s, host %s'
                                   % (user or b'None', pid, host))
                 ui.write(("%-6s %s (%ds)\n") % (name + ":", locker, age))
                 return 1
             except OSError as e:
                 if e.errno != errno.ENOENT:
                     raise
 
         ui.write(("%-6s free\n") % (name + ":"))
         return 0
 
     held += report(repo.svfs, "lock", repo.lock)
     held += report(repo.vfs, "wlock", repo.wlock)
 
     return held
 
 @command('debugmanifestfulltextcache', [
         ('', 'clear', False, _('clear the cache')),
         ('a', 'add', [], _('add the given manifest nodes to the cache'),
          _('NODE'))
     ], '')
 def debugmanifestfulltextcache(ui, repo, add=(), **opts):
     """show, clear or amend the contents of the manifest fulltext cache"""
 
     def getcache():
         r = repo.manifestlog.getstorage(b'')
         try:
             return r._fulltextcache
         except AttributeError:
             msg = _("Current revlog implementation doesn't appear to have a "
                     "manifest fulltext cache\n")
             raise error.Abort(msg)
 
     if opts.get(r'clear'):
         with repo.wlock():
             cache = getcache()
             cache.clear(clear_persisted_data=True)
             return
 
     if add:
         with repo.wlock():
             m = repo.manifestlog
             store = m.getstorage(b'')
             for n in add:
                 try:
                     manifest = m[store.lookup(n)]
                 except error.LookupError as e:
                     raise error.Abort(e, hint="Check your manifest node id")
                 manifest.read()  # stores revisision in cache too
             return
 
     cache = getcache()
     if not len(cache):
         ui.write(_('cache empty\n'))
     else:
         ui.write(
             _('cache contains %d manifest entries, in order of most to '
               'least recent:\n') % (len(cache),))
         totalsize = 0
         for nodeid in cache:
             # Use cache.get to not update the LRU order
             data = cache.peek(nodeid)
             size = len(data)
             totalsize += size + 24   # 20 bytes nodeid, 4 bytes size
             ui.write(_('id: %s, size %s\n') % (
                 hex(nodeid), util.bytecount(size)))
         ondisk = cache._opener.stat('manifestfulltextcache').st_size
         ui.write(
             _('total cache data size %s, on-disk %s\n') % (
                 util.bytecount(totalsize), util.bytecount(ondisk))
         )
 
 @command('debugmergestate', [], '')
 def debugmergestate(ui, repo, *args):
     """print merge state
 
     Use --verbose to print out information about whether v1 or v2 merge state
     was chosen."""
     def _hashornull(h):
         if h == nullhex:
             return 'null'
         else:
             return h
 
     def printrecords(version):
         ui.write(('* version %d records\n') % version)
         if version == 1:
             records = v1records
         else:
             records = v2records
 
         for rtype, record in records:
             # pretty print some record types
             if rtype == 'L':
                 ui.write(('local: %s\n') % record)
             elif rtype == 'O':
                 ui.write(('other: %s\n') % record)
             elif rtype == 'm':
                 driver, mdstate = record.split('\0', 1)
                 ui.write(('merge driver: %s (state "%s")\n')
                          % (driver, mdstate))
             elif rtype in 'FDC':
                 r = record.split('\0')
                 f, state, hash, lfile, afile, anode, ofile = r[0:7]
                 if version == 1:
                     onode = 'not stored in v1 format'
                     flags = r[7]
                 else:
                     onode, flags = r[7:9]
                 ui.write(('file: %s (record type "%s", state "%s", hash %s)\n')
                          % (f, rtype, state, _hashornull(hash)))
                 ui.write(('  local path: %s (flags "%s")\n') % (lfile, flags))
                 ui.write(('  ancestor path: %s (node %s)\n')
                          % (afile, _hashornull(anode)))
                 ui.write(('  other path: %s (node %s)\n')
                          % (ofile, _hashornull(onode)))
             elif rtype == 'f':
                 filename, rawextras = record.split('\0', 1)
                 extras = rawextras.split('\0')
                 i = 0
                 extrastrings = []
                 while i < len(extras):
                     extrastrings.append('%s = %s' % (extras[i], extras[i + 1]))
                     i += 2
 
                 ui.write(('file extras: %s (%s)\n')
                          % (filename, ', '.join(extrastrings)))
             elif rtype == 'l':
                 labels = record.split('\0', 2)
                 labels = [l for l in labels if len(l) > 0]
                 ui.write(('labels:\n'))
                 ui.write(('  local: %s\n' % labels[0]))
                 ui.write(('  other: %s\n' % labels[1]))
                 if len(labels) > 2:
                     ui.write(('  base:  %s\n' % labels[2]))
             else:
                 ui.write(('unrecognized entry: %s\t%s\n')
                          % (rtype, record.replace('\0', '\t')))
 
     # Avoid mergestate.read() since it may raise an exception for unsupported
     # merge state records. We shouldn't be doing this, but this is OK since this
     # command is pretty low-level.
     ms = mergemod.mergestate(repo)
 
     # sort so that reasonable information is on top
     v1records = ms._readrecordsv1()
     v2records = ms._readrecordsv2()
     order = 'LOml'
     def key(r):
         idx = order.find(r[0])
         if idx == -1:
             return (1, r[1])
         else:
             return (0, idx)
     v1records.sort(key=key)
     v2records.sort(key=key)
 
     if not v1records and not v2records:
         ui.write(('no merge state found\n'))
     elif not v2records:
         ui.note(('no version 2 merge state\n'))
         printrecords(1)
     elif ms._v1v2match(v1records, v2records):
         ui.note(('v1 and v2 states match: using v2\n'))
         printrecords(2)
     else:
         ui.note(('v1 and v2 states mismatch: using v1\n'))
         printrecords(1)
         if ui.verbose:
             printrecords(2)
 
 @command('debugnamecomplete', [], _('NAME...'))
 def debugnamecomplete(ui, repo, *args):
     '''complete "names" - tags, open branch names, bookmark names'''
 
     names = set()
     # since we previously only listed open branches, we will handle that
     # specially (after this for loop)
     for name, ns in repo.names.iteritems():
         if name != 'branches':
             names.update(ns.listnames(repo))
     names.update(tag for (tag, heads, tip, closed)
                  in repo.branchmap().iterbranches() if not closed)
     completions = set()
     if not args:
         args = ['']
     for a in args:
         completions.update(n for n in names if n.startswith(a))
     ui.write('\n'.join(sorted(completions)))
     ui.write('\n')
 
 @command('debugobsolete',
         [('', 'flags', 0, _('markers flag')),
          ('', 'record-parents', False,
           _('record parent information for the precursor')),
          ('r', 'rev', [], _('display markers relevant to REV')),
          ('', 'exclusive', False, _('restrict display to markers only '
                                     'relevant to REV')),
          ('', 'index', False, _('display index of the marker')),
          ('', 'delete', [], _('delete markers specified by indices')),
         ] + cmdutil.commitopts2 + cmdutil.formatteropts,
          _('[OBSOLETED [REPLACEMENT ...]]'))
 def debugobsolete(ui, repo, precursor=None, *successors, **opts):
     """create arbitrary obsolete marker
 
     With no arguments, displays the list of obsolescence markers."""
 
     opts = pycompat.byteskwargs(opts)
 
     def parsenodeid(s):
         try:
             # We do not use revsingle/revrange functions here to accept
             # arbitrary node identifiers, possibly not present in the
             # local repository.
             n = bin(s)
             if len(n) != len(nullid):
                 raise TypeError()
             return n
         except TypeError:
             raise error.Abort('changeset references must be full hexadecimal '
                              'node identifiers')
 
     if opts.get('delete'):
         indices = []
         for v in opts.get('delete'):
             try:
                 indices.append(int(v))
             except ValueError:
                 raise error.Abort(_('invalid index value: %r') % v,
                                   hint=_('use integers for indices'))
 
         if repo.currenttransaction():
             raise error.Abort(_('cannot delete obsmarkers in the middle '
                                 'of transaction.'))
 
         with repo.lock():
             n = repair.deleteobsmarkers(repo.obsstore, indices)
             ui.write(_('deleted %i obsolescence markers\n') % n)
 
         return
 
     if precursor is not None:
         if opts['rev']:
             raise error.Abort('cannot select revision when creating marker')
         metadata = {}
         metadata['user'] = encoding.fromlocal(opts['user'] or ui.username())
         succs = tuple(parsenodeid(succ) for succ in successors)
         l = repo.lock()
         try:
             tr = repo.transaction('debugobsolete')
             try:
                 date = opts.get('date')
                 if date:
                     date = dateutil.parsedate(date)
                 else:
                     date = None
                 prec = parsenodeid(precursor)
                 parents = None
                 if opts['record_parents']:
                     if prec not in repo.unfiltered():
                         raise error.Abort('cannot used --record-parents on '
                                          'unknown changesets')
                     parents = repo.unfiltered()[prec].parents()
                     parents = tuple(p.node() for p in parents)
                 repo.obsstore.create(tr, prec, succs, opts['flags'],
                                      parents=parents, date=date,
                                      metadata=metadata, ui=ui)
                 tr.close()
             except ValueError as exc:
                 raise error.Abort(_('bad obsmarker input: %s') %
                                   pycompat.bytestr(exc))
             finally:
                 tr.release()
         finally:
             l.release()
     else:
         if opts['rev']:
             revs = scmutil.revrange(repo, opts['rev'])
             nodes = [repo[r].node() for r in revs]
             markers = list(obsutil.getmarkers(repo, nodes=nodes,
                                                exclusive=opts['exclusive']))
             markers.sort(key=lambda x: x._data)
         else:
             markers = obsutil.getmarkers(repo)
 
         markerstoiter = markers
         isrelevant = lambda m: True
         if opts.get('rev') and opts.get('index'):
             markerstoiter = obsutil.getmarkers(repo)
             markerset = set(markers)
             isrelevant = lambda m: m in markerset
 
         fm = ui.formatter('debugobsolete', opts)
         for i, m in enumerate(markerstoiter):
             if not isrelevant(m):
                 # marker can be irrelevant when we're iterating over a set
                 # of markers (markerstoiter) which is bigger than the set
                 # of markers we want to display (markers)
                 # this can happen if both --index and --rev options are
                 # provided and thus we need to iterate over all of the markers
                 # to get the correct indices, but only display the ones that
                 # are relevant to --rev value
                 continue
             fm.startitem()
             ind = i if opts.get('index') else None
             cmdutil.showmarker(fm, m, index=ind)
         fm.end()
 
 @command('debugp1copies',
          [('r', 'rev', '', _('revision to debug'), _('REV'))],
          _('[-r REV]'))
 def debugp1copies(ui, repo, **opts):
     """dump copy information compared to p1"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get('rev'), default=None)
     for dst, src in ctx.p1copies().items():
         ui.write('%s -> %s\n' % (src, dst))
 
 @command('debugp2copies',
          [('r', 'rev', '', _('revision to debug'), _('REV'))],
          _('[-r REV]'))
 def debugp1copies(ui, repo, **opts):
     """dump copy information compared to p2"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get('rev'), default=None)
     for dst, src in ctx.p2copies().items():
         ui.write('%s -> %s\n' % (src, dst))
 
 @command('debugpathcomplete',
          [('f', 'full', None, _('complete an entire path')),
           ('n', 'normal', None, _('show only normal files')),
           ('a', 'added', None, _('show only added files')),
           ('r', 'removed', None, _('show only removed files'))],
          _('FILESPEC...'))
 def debugpathcomplete(ui, repo, *specs, **opts):
     '''complete part or all of a tracked path
 
     This command supports shells that offer path name completion. It
     currently completes only files already known to the dirstate.
 
     Completion extends only to the next path segment unless
     --full is specified, in which case entire paths are used.'''
 
     def complete(path, acceptable):
         dirstate = repo.dirstate
         spec = os.path.normpath(os.path.join(encoding.getcwd(), path))
         rootdir = repo.root + pycompat.ossep
         if spec != repo.root and not spec.startswith(rootdir):
             return [], []
         if os.path.isdir(spec):
             spec += '/'
         spec = spec[len(rootdir):]
         fixpaths = pycompat.ossep != '/'
         if fixpaths:
             spec = spec.replace(pycompat.ossep, '/')
         speclen = len(spec)
         fullpaths = opts[r'full']
         files, dirs = set(), set()
         adddir, addfile = dirs.add, files.add
         for f, st in dirstate.iteritems():
             if f.startswith(spec) and st[0] in acceptable:
                 if fixpaths:
                     f = f.replace('/', pycompat.ossep)
                 if fullpaths:
                     addfile(f)
                     continue
                 s = f.find(pycompat.ossep, speclen)
                 if s >= 0:
                     adddir(f[:s])
                 else:
                     addfile(f)
         return files, dirs
 
     acceptable = ''
     if opts[r'normal']:
         acceptable += 'nm'
     if opts[r'added']:
         acceptable += 'a'
     if opts[r'removed']:
         acceptable += 'r'
     cwd = repo.getcwd()
     if not specs:
         specs = ['.']
 
     files, dirs = set(), set()
     for spec in specs:
         f, d = complete(spec, acceptable or 'nmar')
         files.update(f)
         dirs.update(d)
     files.update(dirs)
     ui.write('\n'.join(repo.pathto(p, cwd) for p in sorted(files)))
     ui.write('\n')
 
 @command('debugpathcopies',
          cmdutil.walkopts,
          'hg debugpathcopies REV1 REV2 [FILE]',
          inferrepo=True)
 def debugpathcopies(ui, repo, rev1, rev2, *pats, **opts):
     """show copies between two revisions"""
     ctx1 = scmutil.revsingle(repo, rev1)
     ctx2 = scmutil.revsingle(repo, rev2)
     m = scmutil.match(ctx1, pats, opts)
     for dst, src in sorted(copies.pathcopies(ctx1, ctx2, m).items()):
         ui.write('%s -> %s\n' % (src, dst))
 
 @command('debugpeer', [], _('PATH'), norepo=True)
 def debugpeer(ui, path):
     """establish a connection to a peer repository"""
     # Always enable peer request logging. Requires --debug to display
     # though.
     overrides = {
         ('devel', 'debug.peer-request'): True,
     }
 
     with ui.configoverride(overrides):
         peer = hg.peer(ui, {}, path)
 
         local = peer.local() is not None
         canpush = peer.canpush()
 
         ui.write(_('url: %s\n') % peer.url())
         ui.write(_('local: %s\n') % (_('yes') if local else _('no')))
         ui.write(_('pushable: %s\n') % (_('yes') if canpush else _('no')))
 
 @command('debugpickmergetool',
         [('r', 'rev', '', _('check for files in this revision'), _('REV')),
          ('', 'changedelete', None, _('emulate merging change and delete')),
         ] + cmdutil.walkopts + cmdutil.mergetoolopts,
         _('[PATTERN]...'),
         inferrepo=True)
 def debugpickmergetool(ui, repo, *pats, **opts):
     """examine which merge tool is chosen for specified file
 
     As described in :hg:`help merge-tools`, Mercurial examines
     configurations below in this order to decide which merge tool is
     chosen for specified file.
 
     1. ``--tool`` option
     2. ``HGMERGE`` environment variable
     3. configurations in ``merge-patterns`` section
     4. configuration of ``ui.merge``
     5. configurations in ``merge-tools`` section
     6. ``hgmerge`` tool (for historical reason only)
     7. default tool for fallback (``:merge`` or ``:prompt``)
 
     This command writes out examination result in the style below::
 
         FILE = MERGETOOL
 
     By default, all files known in the first parent context of the
     working directory are examined. Use file patterns and/or -I/-X
     options to limit target files. -r/--rev is also useful to examine
     files in another context without actual updating to it.
 
     With --debug, this command shows warning messages while matching
     against ``merge-patterns`` and so on, too. It is recommended to
     use this option with explicit file patterns and/or -I/-X options,
     because this option increases amount of output per file according
     to configurations in hgrc.
 
     With -v/--verbose, this command shows configurations below at
     first (only if specified).
 
     - ``--tool`` option
     - ``HGMERGE`` environment variable
     - configuration of ``ui.merge``
 
     If merge tool is chosen before matching against
     ``merge-patterns``, this command can't show any helpful
     information, even with --debug. In such case, information above is
     useful to know why a merge tool is chosen.
     """
     opts = pycompat.byteskwargs(opts)
     overrides = {}
     if opts['tool']:
         overrides[('ui', 'forcemerge')] = opts['tool']
         ui.note(('with --tool %r\n') % (pycompat.bytestr(opts['tool'])))
 
     with ui.configoverride(overrides, 'debugmergepatterns'):
         hgmerge = encoding.environ.get("HGMERGE")
         if hgmerge is not None:
             ui.note(('with HGMERGE=%r\n') % (pycompat.bytestr(hgmerge)))
         uimerge = ui.config("ui", "merge")
         if uimerge:
             ui.note(('with ui.merge=%r\n') % (pycompat.bytestr(uimerge)))
 
         ctx = scmutil.revsingle(repo, opts.get('rev'))
         m = scmutil.match(ctx, pats, opts)
         changedelete = opts['changedelete']
         for path in ctx.walk(m):
             fctx = ctx[path]
             try:
                 if not ui.debugflag:
                     ui.pushbuffer(error=True)
                 tool, toolpath = filemerge._picktool(repo, ui, path,
                                                      fctx.isbinary(),
                                                      'l' in fctx.flags(),
                                                      changedelete)
             finally:
                 if not ui.debugflag:
                     ui.popbuffer()
             ui.write(('%s = %s\n') % (path, tool))
 
 @command('debugpushkey', [], _('REPO NAMESPACE [KEY OLD NEW]'), norepo=True)
 def debugpushkey(ui, repopath, namespace, *keyinfo, **opts):
     '''access the pushkey key/value protocol
 
     With two args, list the keys in the given namespace.
 
     With five args, set a key to new if it currently is set to old.
     Reports success or failure.
     '''
 
     target = hg.peer(ui, {}, repopath)
     if keyinfo:
         key, old, new = keyinfo
         with target.commandexecutor() as e:
             r = e.callcommand('pushkey', {
                 'namespace': namespace,
                 'key': key,
                 'old': old,
                 'new': new,
             }).result()
 
         ui.status(pycompat.bytestr(r) + '\n')
         return not r
     else:
         for k, v in sorted(target.listkeys(namespace).iteritems()):
             ui.write("%s\t%s\n" % (stringutil.escapestr(k),
                                    stringutil.escapestr(v)))
 
 @command('debugpvec', [], _('A B'))
 def debugpvec(ui, repo, a, b=None):
     ca = scmutil.revsingle(repo, a)
     cb = scmutil.revsingle(repo, b)
     pa = pvec.ctxpvec(ca)
     pb = pvec.ctxpvec(cb)
     if pa == pb:
         rel = "="
     elif pa > pb:
         rel = ">"
     elif pa < pb:
         rel = "<"
     elif pa | pb:
         rel = "|"
     ui.write(_("a: %s\n") % pa)
     ui.write(_("b: %s\n") % pb)
     ui.write(_("depth(a): %d depth(b): %d\n") % (pa._depth, pb._depth))
     ui.write(_("delta: %d hdist: %d distance: %d relation: %s\n") %
              (abs(pa._depth - pb._depth), pvec._hamming(pa._vec, pb._vec),
               pa.distance(pb), rel))
 
 @command('debugrebuilddirstate|debugrebuildstate',
     [('r', 'rev', '', _('revision to rebuild to'), _('REV')),
      ('', 'minimal', None, _('only rebuild files that are inconsistent with '
                              'the working copy parent')),
     ],
     _('[-r REV]'))
 def debugrebuilddirstate(ui, repo, rev, **opts):
     """rebuild the dirstate as it would look like for the given revision
 
     If no revision is specified the first current parent will be used.
 
     The dirstate will be set to the files of the given revision.
     The actual working directory content or existing dirstate
     information such as adds or removes is not considered.
 
     ``minimal`` will only rebuild the dirstate status for files that claim to be
     tracked but are not in the parent manifest, or that exist in the parent
     manifest but are not in the dirstate. It will not change adds, removes, or
     modified files that are in the working copy parent.
 
     One use of this command is to make the next :hg:`status` invocation
     check the actual file content.
     """
     ctx = scmutil.revsingle(repo, rev)
     with repo.wlock():
         dirstate = repo.dirstate
         changedfiles = None
         # See command doc for what minimal does.
         if opts.get(r'minimal'):
             manifestfiles = set(ctx.manifest().keys())
             dirstatefiles = set(dirstate)
             manifestonly = manifestfiles - dirstatefiles
             dsonly = dirstatefiles - manifestfiles
             dsnotadded = set(f for f in dsonly if dirstate[f] != 'a')
             changedfiles = manifestonly | dsnotadded
 
         dirstate.rebuild(ctx.node(), ctx.manifest(), changedfiles)
 
 @command('debugrebuildfncache', [], '')
 def debugrebuildfncache(ui, repo):
     """rebuild the fncache file"""
     repair.rebuildfncache(ui, repo)
 
 @command('debugrename',
     [('r', 'rev', '', _('revision to debug'), _('REV'))],
     _('[-r REV] [FILE]...'))
 def debugrename(ui, repo, *pats, **opts):
     """dump rename information"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get('rev'))
     m = scmutil.match(ctx, pats, opts)
     for abs in ctx.walk(m):
         fctx = ctx[abs]
         o = fctx.filelog().renamed(fctx.filenode())
         rel = repo.pathto(abs)
         if o:
             ui.write(_("%s renamed from %s:%s\n") % (rel, o[0], hex(o[1])))
         else:
             ui.write(_("%s not renamed\n") % rel)
 
 @command('debugrevlog', cmdutil.debugrevlogopts +
     [('d', 'dump', False, _('dump index data'))],
     _('-c|-m|FILE'),
     optionalrepo=True)
 def debugrevlog(ui, repo, file_=None, **opts):
     """show data and statistics about a revlog"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, 'debugrevlog', file_, opts)
 
     if opts.get("dump"):
         numrevs = len(r)
         ui.write(("# rev p1rev p2rev start   end deltastart base   p1   p2"
                  " rawsize totalsize compression heads chainlen\n"))
         ts = 0
         heads = set()
 
         for rev in pycompat.xrange(numrevs):
             dbase = r.deltaparent(rev)
             if dbase == -1:
                 dbase = rev
             cbase = r.chainbase(rev)
             clen = r.chainlen(rev)
             p1, p2 = r.parentrevs(rev)
             rs = r.rawsize(rev)
             ts = ts + rs
             heads -= set(r.parentrevs(rev))
             heads.add(rev)
             try:
                 compression = ts / r.end(rev)
             except ZeroDivisionError:
                 compression = 0
             ui.write("%5d %5d %5d %5d %5d %10d %4d %4d %4d %7d %9d "
                      "%11d %5d %8d\n" %
                      (rev, p1, p2, r.start(rev), r.end(rev),
                       r.start(dbase), r.start(cbase),
                       r.start(p1), r.start(p2),
                       rs, ts, compression, len(heads), clen))
         return 0
 
     v = r.version
     format = v & 0xFFFF
     flags = []
     gdelta = False
     if v & revlog.FLAG_INLINE_DATA:
         flags.append('inline')
     if v & revlog.FLAG_GENERALDELTA:
         gdelta = True
         flags.append('generaldelta')
     if not flags:
         flags = ['(none)']
 
     ### tracks merge vs single parent
     nummerges = 0
 
     ### tracks ways the "delta" are build
     # nodelta
     numempty = 0
     numemptytext = 0
     numemptydelta = 0
     # full file content
     numfull = 0
     # intermediate snapshot against a prior snapshot
     numsemi = 0
     # snapshot count per depth
     numsnapdepth = collections.defaultdict(lambda: 0)
     # delta against previous revision
     numprev = 0
     # delta against first or second parent (not prev)
     nump1 = 0
     nump2 = 0
     # delta against neither prev nor parents
     numother = 0
     # delta against prev that are also first or second parent
     # (details of `numprev`)
     nump1prev = 0
     nump2prev = 0
 
     # data about delta chain of each revs
     chainlengths = []
     chainbases = []
     chainspans = []
 
     # data about each revision
     datasize = [None, 0, 0]
     fullsize = [None, 0, 0]
     semisize = [None, 0, 0]
     # snapshot count per depth
     snapsizedepth = collections.defaultdict(lambda: [None, 0, 0])
     deltasize = [None, 0, 0]
     chunktypecounts = {}
     chunktypesizes = {}
 
     def addsize(size, l):
         if l[0] is None or size < l[0]:
             l[0] = size
         if size > l[1]:
             l[1] = size
         l[2] += size
 
     numrevs = len(r)
     for rev in pycompat.xrange(numrevs):
         p1, p2 = r.parentrevs(rev)
         delta = r.deltaparent(rev)
         if format > 0:
             addsize(r.rawsize(rev), datasize)
         if p2 != nullrev:
             nummerges += 1
         size = r.length(rev)
         if delta == nullrev:
             chainlengths.append(0)
             chainbases.append(r.start(rev))
             chainspans.append(size)
             if size == 0:
                 numempty += 1
                 numemptytext += 1
             else:
                 numfull += 1
                 numsnapdepth[0] += 1
                 addsize(size, fullsize)
                 addsize(size, snapsizedepth[0])
         else:
             chainlengths.append(chainlengths[delta] + 1)
             baseaddr = chainbases[delta]
             revaddr = r.start(rev)
             chainbases.append(baseaddr)
             chainspans.append((revaddr - baseaddr) + size)
             if size == 0:
                 numempty += 1
                 numemptydelta += 1
             elif r.issnapshot(rev):
                 addsize(size, semisize)
                 numsemi += 1
                 depth = r.snapshotdepth(rev)
                 numsnapdepth[depth] += 1
                 addsize(size, snapsizedepth[depth])
             else:
                 addsize(size, deltasize)
                 if delta == rev - 1:
                     numprev += 1
                     if delta == p1:
                         nump1prev += 1
                     elif delta == p2:
                         nump2prev += 1
                 elif delta == p1:
                     nump1 += 1
                 elif delta == p2:
                     nump2 += 1
                 elif delta != nullrev:
                     numother += 1
 
         # Obtain data on the raw chunks in the revlog.
         if util.safehasattr(r, '_getsegmentforrevs'):
             segment = r._getsegmentforrevs(rev, rev)[1]
         else:
             segment = r._revlog._getsegmentforrevs(rev, rev)[1]
         if segment:
             chunktype = bytes(segment[0:1])
         else:
             chunktype = 'empty'
 
         if chunktype not in chunktypecounts:
             chunktypecounts[chunktype] = 0
             chunktypesizes[chunktype] = 0
 
         chunktypecounts[chunktype] += 1
         chunktypesizes[chunktype] += size
 
     # Adjust size min value for empty cases
     for size in (datasize, fullsize, semisize, deltasize):
         if size[0] is None:
             size[0] = 0
 
     numdeltas = numrevs - numfull - numempty - numsemi
     numoprev = numprev - nump1prev - nump2prev
     totalrawsize = datasize[2]
     datasize[2] /= numrevs
     fulltotal = fullsize[2]
     fullsize[2] /= numfull
     semitotal = semisize[2]
     snaptotal = {}
     if numsemi > 0:
         semisize[2] /= numsemi
     for depth in snapsizedepth:
         snaptotal[depth] = snapsizedepth[depth][2]
         snapsizedepth[depth][2] /= numsnapdepth[depth]
 
     deltatotal = deltasize[2]
     if numdeltas > 0:
         deltasize[2] /= numdeltas
     totalsize = fulltotal + semitotal + deltatotal
     avgchainlen = sum(chainlengths) / numrevs
     maxchainlen = max(chainlengths)
     maxchainspan = max(chainspans)
     compratio = 1
     if totalsize:
         compratio = totalrawsize / totalsize
 
     basedfmtstr = '%%%dd\n'
     basepcfmtstr = '%%%dd %s(%%5.2f%%%%)\n'
 
     def dfmtstr(max):
         return basedfmtstr % len(str(max))
     def pcfmtstr(max, padding=0):
         return basepcfmtstr % (len(str(max)), ' ' * padding)
 
     def pcfmt(value, total):
         if total:
             return (value, 100 * float(value) / total)
         else:
             return value, 100.0
 
     ui.write(('format : %d\n') % format)
     ui.write(('flags  : %s\n') % ', '.join(flags))
 
     ui.write('\n')
     fmt = pcfmtstr(totalsize)
     fmt2 = dfmtstr(totalsize)
     ui.write(('revisions     : ') + fmt2 % numrevs)
     ui.write(('    merges    : ') + fmt % pcfmt(nummerges, numrevs))
     ui.write(('    normal    : ') + fmt % pcfmt(numrevs - nummerges, numrevs))
     ui.write(('revisions     : ') + fmt2 % numrevs)
     ui.write(('    empty     : ') + fmt % pcfmt(numempty, numrevs))
     ui.write(('                   text  : ')
              + fmt % pcfmt(numemptytext, numemptytext + numemptydelta))
     ui.write(('                   delta : ')
              + fmt % pcfmt(numemptydelta, numemptytext + numemptydelta))
     ui.write(('    snapshot  : ') + fmt % pcfmt(numfull + numsemi, numrevs))
     for depth in sorted(numsnapdepth):
         ui.write(('      lvl-%-3d :       ' % depth)
                  + fmt % pcfmt(numsnapdepth[depth], numrevs))
     ui.write(('    deltas    : ') + fmt % pcfmt(numdeltas, numrevs))
     ui.write(('revision size : ') + fmt2 % totalsize)
     ui.write(('    snapshot  : ')
              + fmt % pcfmt(fulltotal + semitotal, totalsize))
     for depth in sorted(numsnapdepth):
         ui.write(('      lvl-%-3d :       ' % depth)
                  + fmt % pcfmt(snaptotal[depth], totalsize))
     ui.write(('    deltas    : ') + fmt % pcfmt(deltatotal, totalsize))
 
     def fmtchunktype(chunktype):
         if chunktype == 'empty':
             return '    %s     : ' % chunktype
         elif chunktype in pycompat.bytestr(string.ascii_letters):
             return '    0x%s (%s)  : ' % (hex(chunktype), chunktype)
         else:
             return '    0x%s      : ' % hex(chunktype)
 
     ui.write('\n')
     ui.write(('chunks        : ') + fmt2 % numrevs)
     for chunktype in sorted(chunktypecounts):
         ui.write(fmtchunktype(chunktype))
         ui.write(fmt % pcfmt(chunktypecounts[chunktype], numrevs))
     ui.write(('chunks size   : ') + fmt2 % totalsize)
     for chunktype in sorted(chunktypecounts):
         ui.write(fmtchunktype(chunktype))
         ui.write(fmt % pcfmt(chunktypesizes[chunktype], totalsize))
 
     ui.write('\n')
     fmt = dfmtstr(max(avgchainlen, maxchainlen, maxchainspan, compratio))
     ui.write(('avg chain length  : ') + fmt % avgchainlen)
     ui.write(('max chain length  : ') + fmt % maxchainlen)
     ui.write(('max chain reach   : ') + fmt % maxchainspan)
     ui.write(('compression ratio : ') + fmt % compratio)
 
     if format > 0:
         ui.write('\n')
         ui.write(('uncompressed data size (min/max/avg) : %d / %d / %d\n')
                  % tuple(datasize))
     ui.write(('full revision size (min/max/avg)     : %d / %d / %d\n')
              % tuple(fullsize))
     ui.write(('inter-snapshot size (min/max/avg)    : %d / %d / %d\n')
              % tuple(semisize))
     for depth in sorted(snapsizedepth):
         if depth == 0:
             continue
         ui.write(('    level-%-3d (min/max/avg)          : %d / %d / %d\n')
                  % ((depth,) + tuple(snapsizedepth[depth])))
     ui.write(('delta size (min/max/avg)             : %d / %d / %d\n')
              % tuple(deltasize))
 
     if numdeltas > 0:
         ui.write('\n')
         fmt = pcfmtstr(numdeltas)
         fmt2 = pcfmtstr(numdeltas, 4)
         ui.write(('deltas against prev  : ') + fmt % pcfmt(numprev, numdeltas))
         if numprev > 0:
             ui.write(('    where prev = p1  : ') + fmt2 % pcfmt(nump1prev,
                                                               numprev))
             ui.write(('    where prev = p2  : ') + fmt2 % pcfmt(nump2prev,
                                                               numprev))
             ui.write(('    other            : ') + fmt2 % pcfmt(numoprev,
                                                               numprev))
         if gdelta:
             ui.write(('deltas against p1    : ')
                      + fmt % pcfmt(nump1, numdeltas))
             ui.write(('deltas against p2    : ')
                      + fmt % pcfmt(nump2, numdeltas))
             ui.write(('deltas against other : ') + fmt % pcfmt(numother,
                                                              numdeltas))
 
 @command('debugrevlogindex', cmdutil.debugrevlogopts +
     [('f', 'format', 0, _('revlog format'), _('FORMAT'))],
     _('[-f FORMAT] -c|-m|FILE'),
     optionalrepo=True)
 def debugrevlogindex(ui, repo, file_=None, **opts):
     """dump the contents of a revlog index"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, 'debugrevlogindex', file_, opts)
     format = opts.get('format', 0)
     if format not in (0, 1):
         raise error.Abort(_("unknown format %d") % format)
 
     if ui.debugflag:
         shortfn = hex
     else:
         shortfn = short
 
     # There might not be anything in r, so have a sane default
     idlen = 12
     for i in r:
         idlen = len(shortfn(r.node(i)))
         break
 
     if format == 0:
         if ui.verbose:
             ui.write(("   rev    offset  length linkrev"
                      " %s %s p2\n") % ("nodeid".ljust(idlen),
                                        "p1".ljust(idlen)))
         else:
             ui.write(("   rev linkrev %s %s p2\n") % (
                 "nodeid".ljust(idlen), "p1".ljust(idlen)))
     elif format == 1:
         if ui.verbose:
             ui.write(("   rev flag   offset   length     size   link     p1"
                       "     p2 %s\n") % "nodeid".rjust(idlen))
         else:
             ui.write(("   rev flag     size   link     p1     p2 %s\n") %
                      "nodeid".rjust(idlen))
 
     for i in r:
         node = r.node(i)
         if format == 0:
             try:
                 pp = r.parents(node)
             except Exception:
                 pp = [nullid, nullid]
             if ui.verbose:
                 ui.write("% 6d % 9d % 7d % 7d %s %s %s\n" % (
                         i, r.start(i), r.length(i), r.linkrev(i),
                         shortfn(node), shortfn(pp[0]), shortfn(pp[1])))
             else:
                 ui.write("% 6d % 7d %s %s %s\n" % (
                     i, r.linkrev(i), shortfn(node), shortfn(pp[0]),
                     shortfn(pp[1])))
         elif format == 1:
             pr = r.parentrevs(i)
             if ui.verbose:
                 ui.write("% 6d %04x % 8d % 8d % 8d % 6d % 6d % 6d %s\n" % (
                         i, r.flags(i), r.start(i), r.length(i), r.rawsize(i),
                         r.linkrev(i), pr[0], pr[1], shortfn(node)))
             else:
                 ui.write("% 6d %04x % 8d % 6d % 6d % 6d %s\n" % (
                     i, r.flags(i), r.rawsize(i), r.linkrev(i), pr[0], pr[1],
                     shortfn(node)))
 
 @command('debugrevspec',
     [('', 'optimize', None,
       _('print parsed tree after optimizing (DEPRECATED)')),
      ('', 'show-revs', True, _('print list of result revisions (default)')),
      ('s', 'show-set', None, _('print internal representation of result set')),
      ('p', 'show-stage', [],
       _('print parsed tree at the given stage'), _('NAME')),
      ('', 'no-optimized', False, _('evaluate tree without optimization')),
      ('', 'verify-optimized', False, _('verify optimized result')),
      ],
     ('REVSPEC'))
 def debugrevspec(ui, repo, expr, **opts):
     """parse and apply a revision specification
 
     Use -p/--show-stage option to print the parsed tree at the given stages.
     Use -p all to print tree at every stage.
 
     Use --no-show-revs option with -s or -p to print only the set
     representation or the parsed tree respectively.
 
     Use --verify-optimized to compare the optimized result with the unoptimized
     one. Returns 1 if the optimized result differs.
     """
     opts = pycompat.byteskwargs(opts)
     aliases = ui.configitems('revsetalias')
     stages = [
         ('parsed', lambda tree: tree),
         ('expanded', lambda tree: revsetlang.expandaliases(tree, aliases,
                                                            ui.warn)),
         ('concatenated', revsetlang.foldconcat),
         ('analyzed', revsetlang.analyze),
         ('optimized', revsetlang.optimize),
     ]
     if opts['no_optimized']:
         stages = stages[:-1]
     if opts['verify_optimized'] and opts['no_optimized']:
         raise error.Abort(_('cannot use --verify-optimized with '
                             '--no-optimized'))
     stagenames = set(n for n, f in stages)
 
     showalways = set()
     showchanged = set()
     if ui.verbose and not opts['show_stage']:
         # show parsed tree by --verbose (deprecated)
         showalways.add('parsed')
         showchanged.update(['expanded', 'concatenated'])
         if opts['optimize']:
             showalways.add('optimized')
     if opts['show_stage'] and opts['optimize']:
         raise error.Abort(_('cannot use --optimize with --show-stage'))
     if opts['show_stage'] == ['all']:
         showalways.update(stagenames)
     else:
         for n in opts['show_stage']:
             if n not in stagenames:
                 raise error.Abort(_('invalid stage name: %s') % n)
         showalways.update(opts['show_stage'])
 
     treebystage = {}
     printedtree = None
     tree = revsetlang.parse(expr, lookup=revset.lookupfn(repo))
     for n, f in stages:
         treebystage[n] = tree = f(tree)
         if n in showalways or (n in showchanged and tree != printedtree):
             if opts['show_stage'] or n != 'parsed':
                 ui.write(("* %s:\n") % n)
             ui.write(revsetlang.prettyformat(tree), "\n")
             printedtree = tree
 
     if opts['verify_optimized']:
         arevs = revset.makematcher(treebystage['analyzed'])(repo)
         brevs = revset.makematcher(treebystage['optimized'])(repo)
         if opts['show_set'] or (opts['show_set'] is None and ui.verbose):
             ui.write(("* analyzed set:\n"), stringutil.prettyrepr(arevs), "\n")
             ui.write(("* optimized set:\n"), stringutil.prettyrepr(brevs), "\n")
         arevs = list(arevs)
         brevs = list(brevs)
         if arevs == brevs:
             return 0
         ui.write(('--- analyzed\n'), label='diff.file_a')
         ui.write(('+++ optimized\n'), label='diff.file_b')
         sm = difflib.SequenceMatcher(None, arevs, brevs)
         for tag, alo, ahi, blo, bhi in sm.get_opcodes():
             if tag in (r'delete', r'replace'):
                 for c in arevs[alo:ahi]:
                     ui.write('-%d\n' % c, label='diff.deleted')
             if tag in (r'insert', r'replace'):
                 for c in brevs[blo:bhi]:
                     ui.write('+%d\n' % c, label='diff.inserted')
             if tag == r'equal':
                 for c in arevs[alo:ahi]:
                     ui.write(' %d\n' % c)
         return 1
 
     func = revset.makematcher(tree)
     revs = func(repo)
     if opts['show_set'] or (opts['show_set'] is None and ui.verbose):
         ui.write(("* set:\n"), stringutil.prettyrepr(revs), "\n")
     if not opts['show_revs']:
         return
     for c in revs:
         ui.write("%d\n" % c)
 
 @command('debugserve', [
     ('', 'sshstdio', False, _('run an SSH server bound to process handles')),
     ('', 'logiofd', '', _('file descriptor to log server I/O to')),
     ('', 'logiofile', '', _('file to log server I/O to')),
 ], '')
 def debugserve(ui, repo, **opts):
     """run a server with advanced settings
 
     This command is similar to :hg:`serve`. It exists partially as a
     workaround to the fact that ``hg serve --stdio`` must have specific
     arguments for security reasons.
     """
     opts = pycompat.byteskwargs(opts)
 
     if not opts['sshstdio']:
         raise error.Abort(_('only --sshstdio is currently supported'))
 
     logfh = None
 
     if opts['logiofd'] and opts['logiofile']:
         raise error.Abort(_('cannot use both --logiofd and --logiofile'))
 
     if opts['logiofd']:
         # Line buffered because output is line based.
         try:
             logfh = os.fdopen(int(opts['logiofd']), r'ab', 1)
         except OSError as e:
             if e.errno != errno.ESPIPE:
                 raise
             # can't seek a pipe, so `ab` mode fails on py3
             logfh = os.fdopen(int(opts['logiofd']), r'wb', 1)
     elif opts['logiofile']:
         logfh = open(opts['logiofile'], 'ab', 1)
 
     s = wireprotoserver.sshserver(ui, repo, logfh=logfh)
     s.serve_forever()
 
 @command('debugsetparents', [], _('REV1 [REV2]'))
 def debugsetparents(ui, repo, rev1, rev2=None):
     """manually set the parents of the current working directory
 
     This is useful for writing repository conversion tools, but should
     be used with care. For example, neither the working directory nor the
     dirstate is updated, so file status may be incorrect after running this
     command.
 
     Returns 0 on success.
     """
 
     node1 = scmutil.revsingle(repo, rev1).node()
     node2 = scmutil.revsingle(repo, rev2, 'null').node()
 
     with repo.wlock():
         repo.setparents(node1, node2)
 
 @command('debugssl', [], '[SOURCE]', optionalrepo=True)
 def debugssl(ui, repo, source=None, **opts):
     '''test a secure connection to a server
 
     This builds the certificate chain for the server on Windows, installing the
     missing intermediates and trusted root via Windows Update if necessary.  It
     does nothing on other platforms.
 
     If SOURCE is omitted, the 'default' path will be used.  If a URL is given,
     that server is used. See :hg:`help urls` for more information.
 
     If the update succeeds, retry the original operation.  Otherwise, the cause
     of the SSL error is likely another issue.
     '''
     if not pycompat.iswindows:
         raise error.Abort(_('certificate chain building is only possible on '
                             'Windows'))
 
     if not source:
         if not repo:
             raise error.Abort(_("there is no Mercurial repository here, and no "
                                 "server specified"))
         source = "default"
 
     source, branches = hg.parseurl(ui.expandpath(source))
     url = util.url(source)
 
     defaultport = {'https': 443, 'ssh': 22}
     if url.scheme in defaultport:
         try:
             addr = (url.host, int(url.port or defaultport[url.scheme]))
         except ValueError:
             raise error.Abort(_("malformed port number in URL"))
     else:
         raise error.Abort(_("only https and ssh connections are supported"))
 
     from . import win32
 
     s = ssl.wrap_socket(socket.socket(), ssl_version=ssl.PROTOCOL_TLS,
                         cert_reqs=ssl.CERT_NONE, ca_certs=None)
 
     try:
         s.connect(addr)
         cert = s.getpeercert(True)
 
         ui.status(_('checking the certificate chain for %s\n') % url.host)
 
         complete = win32.checkcertificatechain(cert, build=False)
 
         if not complete:
             ui.status(_('certificate chain is incomplete, updating... '))
 
             if not win32.checkcertificatechain(cert):
                 ui.status(_('failed.\n'))
             else:
                 ui.status(_('done.\n'))
         else:
             ui.status(_('full certificate chain is available\n'))
     finally:
         s.close()
 
 @command('debugsub',
     [('r', 'rev', '',
      _('revision to check'), _('REV'))],
     _('[-r REV] [REV]'))
 def debugsub(ui, repo, rev=None):
     ctx = scmutil.revsingle(repo, rev, None)
     for k, v in sorted(ctx.substate.items()):
         ui.write(('path %s\n') % k)
         ui.write((' source   %s\n') % v[0])
         ui.write((' revision %s\n') % v[1])
 
 @command('debugsuccessorssets',
     [('', 'closest', False, _('return closest successors sets only'))],
     _('[REV]'))
 def debugsuccessorssets(ui, repo, *revs, **opts):
     """show set of successors for revision
 
     A successors set of changeset A is a consistent group of revisions that
     succeed A. It contains non-obsolete changesets only unless closests
     successors set is set.
 
     In most cases a changeset A has a single successors set containing a single
     successor (changeset A replaced by A').
 
     A changeset that is made obsolete with no successors are called "pruned".
     Such changesets have no successors sets at all.
 
     A changeset that has been "split" will have a successors set containing
     more than one successor.
 
     A changeset that has been rewritten in multiple different ways is called
     "divergent". Such changesets have multiple successor sets (each of which
     may also be split, i.e. have multiple successors).
 
     Results are displayed as follows::
 
         <rev1>
             <successors-1A>
         <rev2>
             <successors-2A>
             <successors-2B1> <successors-2B2> <successors-2B3>
 
     Here rev2 has two possible (i.e. divergent) successors sets. The first
     holds one element, whereas the second holds three (i.e. the changeset has
     been split).
     """
     # passed to successorssets caching computation from one call to another
     cache = {}
     ctx2str = bytes
     node2str = short
     for rev in scmutil.revrange(repo, revs):
         ctx = repo[rev]
         ui.write('%s\n'% ctx2str(ctx))
         for succsset in obsutil.successorssets(repo, ctx.node(),
                                                 closest=opts[r'closest'],
                                                 cache=cache):
             if succsset:
                 ui.write('    ')
                 ui.write(node2str(succsset[0]))
                 for node in succsset[1:]:
                     ui.write(' ')
                     ui.write(node2str(node))
             ui.write('\n')
 
 @command('debugtemplate',
     [('r', 'rev', [], _('apply template on changesets'), _('REV')),
      ('D', 'define', [], _('define template keyword'), _('KEY=VALUE'))],
     _('[-r REV]... [-D KEY=VALUE]... TEMPLATE'),
     optionalrepo=True)
 def debugtemplate(ui, repo, tmpl, **opts):
     """parse and apply a template
 
     If -r/--rev is given, the template is processed as a log template and
     applied to the given changesets. Otherwise, it is processed as a generic
     template.
 
     Use --verbose to print the parsed tree.
     """
     revs = None
     if opts[r'rev']:
         if repo is None:
             raise error.RepoError(_('there is no Mercurial repository here '
                                     '(.hg not found)'))
         revs = scmutil.revrange(repo, opts[r'rev'])
 
     props = {}
     for d in opts[r'define']:
         try:
             k, v = (e.strip() for e in d.split('=', 1))
             if not k or k == 'ui':
                 raise ValueError
             props[k] = v
         except ValueError:
             raise error.Abort(_('malformed keyword definition: %s') % d)
 
     if ui.verbose:
         aliases = ui.configitems('templatealias')
         tree = templater.parse(tmpl)
         ui.note(templater.prettyformat(tree), '\n')
         newtree = templater.expandaliases(tree, aliases)
         if newtree != tree:
             ui.note(("* expanded:\n"), templater.prettyformat(newtree), '\n')
 
     if revs is None:
         tres = formatter.templateresources(ui, repo)
         t = formatter.maketemplater(ui, tmpl, resources=tres)
         if ui.verbose:
             kwds, funcs = t.symbolsuseddefault()
             ui.write(("* keywords: %s\n") % ', '.join(sorted(kwds)))
             ui.write(("* functions: %s\n") % ', '.join(sorted(funcs)))
         ui.write(t.renderdefault(props))
     else:
         displayer = logcmdutil.maketemplater(ui, repo, tmpl)
         if ui.verbose:
             kwds, funcs = displayer.t.symbolsuseddefault()
             ui.write(("* keywords: %s\n") % ', '.join(sorted(kwds)))
             ui.write(("* functions: %s\n") % ', '.join(sorted(funcs)))
         for r in revs:
             displayer.show(repo[r], **pycompat.strkwargs(props))
         displayer.close()
 
 @command('debuguigetpass', [
     ('p', 'prompt', '', _('prompt text'), _('TEXT')),
 ], _('[-p TEXT]'), norepo=True)
 def debuguigetpass(ui, prompt=''):
     """show prompt to type password"""
     r = ui.getpass(prompt)
     ui.write(('respose: %s\n') % r)
 
 @command('debuguiprompt', [
     ('p', 'prompt', '', _('prompt text'), _('TEXT')),
 ], _('[-p TEXT]'), norepo=True)
 def debuguiprompt(ui, prompt=''):
     """show plain prompt"""
     r = ui.prompt(prompt)
     ui.write(('response: %s\n') % r)
 
 @command('debugupdatecaches', [])
 def debugupdatecaches(ui, repo, *pats, **opts):
     """warm all known caches in the repository"""
     with repo.wlock(), repo.lock():
         repo.updatecaches(full=True)
 
 @command('debugupgraderepo', [
     ('o', 'optimize', [], _('extra optimization to perform'), _('NAME')),
     ('', 'run', False, _('performs an upgrade')),
     ('', 'backup', True, _('keep the old repository content around')),
 ])
 def debugupgraderepo(ui, repo, run=False, optimize=None, backup=True):
     """upgrade a repository to use different features
 
     If no arguments are specified, the repository is evaluated for upgrade
     and a list of problems and potential optimizations is printed.
 
     With ``--run``, a repository upgrade is performed. Behavior of the upgrade
     can be influenced via additional arguments. More details will be provided
     by the command output when run without ``--run``.
 
     During the upgrade, the repository will be locked and no writes will be
     allowed.
 
     At the end of the upgrade, the repository may not be readable while new
     repository data is swapped in. This window will be as long as it takes to
     rename some directories inside the ``.hg`` directory. On most machines, this
     should complete almost instantaneously and the chances of a consumer being
     unable to access the repository should be low.
     """
     return upgrade.upgraderepo(ui, repo, run=run, optimize=optimize,
                                backup=backup)
 
 @command('debugwalk', cmdutil.walkopts, _('[OPTION]... [FILE]...'),
          inferrepo=True)
 def debugwalk(ui, repo, *pats, **opts):
     """show how files match on given patterns"""
     opts = pycompat.byteskwargs(opts)
     m = scmutil.match(repo[None], pats, opts)
     if ui.verbose:
         ui.write(('* matcher:\n'), stringutil.prettyrepr(m), '\n')
     items = list(repo[None].walk(m))
     if not items:
         return
     f = lambda fn: fn
     if ui.configbool('ui', 'slash') and pycompat.ossep != '/':
         f = lambda fn: util.normpath(fn)
     fmt = 'f  %%-%ds  %%-%ds  %%s' % (
         max([len(abs) for abs in items]),
         max([len(repo.pathto(abs)) for abs in items]))
     for abs in items:
         line = fmt % (abs, f(repo.pathto(abs)), m.exact(abs) and 'exact' or '')
         ui.write("%s\n" % line.rstrip())
 
 @command('debugwhyunstable', [], _('REV'))
 def debugwhyunstable(ui, repo, rev):
     """explain instabilities of a changeset"""
     for entry in obsutil.whyunstable(repo, scmutil.revsingle(repo, rev)):
         dnodes = ''
         if entry.get('divergentnodes'):
             dnodes = ' '.join('%s (%s)' % (ctx.hex(), ctx.phasestr())
                               for ctx in entry['divergentnodes']) + ' '
         ui.write('%s: %s%s %s\n' % (entry['instability'], dnodes,
                                     entry['reason'], entry['node']))
 
 @command('debugwireargs',
     [('', 'three', '', 'three'),
     ('', 'four', '', 'four'),
     ('', 'five', '', 'five'),
     ] + cmdutil.remoteopts,
     _('REPO [OPTIONS]... [ONE [TWO]]'),
     norepo=True)
 def debugwireargs(ui, repopath, *vals, **opts):
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     for opt in cmdutil.remoteopts:
         del opts[opt[1]]
     args = {}
     for k, v in opts.iteritems():
         if v:
             args[k] = v
     args = pycompat.strkwargs(args)
     # run twice to check that we don't mess up the stream for the next command
     res1 = repo.debugwireargs(*vals, **args)
     res2 = repo.debugwireargs(*vals, **args)
     ui.write("%s\n" % res1)
     if res1 != res2:
         ui.warn("%s\n" % res2)
 
 def _parsewirelangblocks(fh):
     activeaction = None
     blocklines = []
     lastindent = 0
 
     for line in fh:
         line = line.rstrip()
         if not line:
             continue
 
         if line.startswith(b'#'):
             continue
 
         if not line.startswith(b' '):
             # New block. Flush previous one.
             if activeaction:
                 yield activeaction, blocklines
 
             activeaction = line
             blocklines = []
             lastindent = 0
             continue
 
         # Else we start with an indent.
 
         if not activeaction:
             raise error.Abort(_('indented line outside of block'))
 
         indent = len(line) - len(line.lstrip())
 
         # If this line is indented more than the last line, concatenate it.
         if indent > lastindent and blocklines:
             blocklines[-1] += line.lstrip()
         else:
             blocklines.append(line)
             lastindent = indent
 
     # Flush last block.
     if activeaction:
         yield activeaction, blocklines
 
 @command('debugwireproto',
     [
         ('', 'localssh', False, _('start an SSH server for this repo')),
         ('', 'peer', '', _('construct a specific version of the peer')),
         ('', 'noreadstderr', False, _('do not read from stderr of the remote')),
         ('', 'nologhandshake', False,
          _('do not log I/O related to the peer handshake')),
     ] + cmdutil.remoteopts,
     _('[PATH]'),
     optionalrepo=True)
 def debugwireproto(ui, repo, path=None, **opts):
     """send wire protocol commands to a server
 
     This command can be used to issue wire protocol commands to remote
     peers and to debug the raw data being exchanged.
 
     ``--localssh`` will start an SSH server against the current repository
     and connect to that. By default, the connection will perform a handshake
     and establish an appropriate peer instance.
 
     ``--peer`` can be used to bypass the handshake protocol and construct a
     peer instance using the specified class type. Valid values are ``raw``,
     ``http2``, ``ssh1``, and ``ssh2``. ``raw`` instances only allow sending
     raw data payloads and don't support higher-level command actions.
 
     ``--noreadstderr`` can be used to disable automatic reading from stderr
     of the peer (for SSH connections only). Disabling automatic reading of
     stderr is useful for making output more deterministic.
 
     Commands are issued via a mini language which is specified via stdin.
     The language consists of individual actions to perform. An action is
     defined by a block. A block is defined as a line with no leading
     space followed by 0 or more lines with leading space. Blocks are
     effectively a high-level command with additional metadata.
 
     Lines beginning with ``#`` are ignored.
 
     The following sections denote available actions.
 
     raw
     ---
 
     Send raw data to the server.
 
     The block payload contains the raw data to send as one atomic send
     operation. The data may not actually be delivered in a single system
     call: it depends on the abilities of the transport being used.
 
     Each line in the block is de-indented and concatenated. Then, that
     value is evaluated as a Python b'' literal. This allows the use of
     backslash escaping, etc.
 
     raw+
     ----
 
     Behaves like ``raw`` except flushes output afterwards.
 
     command <X>
     -----------
 
     Send a request to run a named command, whose name follows the ``command``
     string.
 
     Arguments to the command are defined as lines in this block. The format of
     each line is ``<key> <value>``. e.g.::
 
        command listkeys
            namespace bookmarks
 
     If the value begins with ``eval:``, it will be interpreted as a Python
     literal expression. Otherwise values are interpreted as Python b'' literals.
     This allows sending complex types and encoding special byte sequences via
     backslash escaping.
 
     The following arguments have special meaning:
 
     ``PUSHFILE``
         When defined, the *push* mechanism of the peer will be used instead
         of the static request-response mechanism and the content of the
         file specified in the value of this argument will be sent as the
         command payload.
 
         This can be used to submit a local bundle file to the remote.
 
     batchbegin
     ----------
 
     Instruct the peer to begin a batched send.
 
     All ``command`` blocks are queued for execution until the next
     ``batchsubmit`` block.
 
     batchsubmit
     -----------
 
     Submit previously queued ``command`` blocks as a batch request.
 
     This action MUST be paired with a ``batchbegin`` action.
 
     httprequest <method> <path>
     ---------------------------
 
     (HTTP peer only)
 
     Send an HTTP request to the peer.
 
     The HTTP request line follows the ``httprequest`` action. e.g. ``GET /foo``.
 
     Arguments of the form ``<key>: <value>`` are interpreted as HTTP request
     headers to add to the request. e.g. ``Accept: foo``.
 
     The following arguments are special:
 
     ``BODYFILE``
         The content of the file defined as the value to this argument will be
         transferred verbatim as the HTTP request body.
 
     ``frame <type> <flags> <payload>``
         Send a unified protocol frame as part of the request body.
 
         All frames will be collected and sent as the body to the HTTP
         request.
 
     close
     -----
 
     Close the connection to the server.
 
     flush
     -----
 
     Flush data written to the server.
 
     readavailable
     -------------
 
     Close the write end of the connection and read all available data from
     the server.
 
     If the connection to the server encompasses multiple pipes, we poll both
     pipes and read available data.
 
     readline
     --------
 
     Read a line of output from the server. If there are multiple output
     pipes, reads only the main pipe.
 
     ereadline
     ---------
 
     Like ``readline``, but read from the stderr pipe, if available.
 
     read <X>
     --------
 
     ``read()`` N bytes from the server's main output pipe.
 
     eread <X>
     ---------
 
     ``read()`` N bytes from the server's stderr pipe, if available.
 
     Specifying Unified Frame-Based Protocol Frames
     ----------------------------------------------
 
     It is possible to emit a *Unified Frame-Based Protocol* by using special
     syntax.
 
     A frame is composed as a type, flags, and payload. These can be parsed
     from a string of the form:
 
        <request-id> <stream-id> <stream-flags> <type> <flags> <payload>
 
     ``request-id`` and ``stream-id`` are integers defining the request and
     stream identifiers.
 
     ``type`` can be an integer value for the frame type or the string name
     of the type. The strings are defined in ``wireprotoframing.py``. e.g.
     ``command-name``.
 
     ``stream-flags`` and ``flags`` are a ``|`` delimited list of flag
     components. Each component (and there can be just one) can be an integer
     or a flag name for stream flags or frame flags, respectively. Values are
     resolved to integers and then bitwise OR'd together.
 
     ``payload`` represents the raw frame payload. If it begins with
     ``cbor:``, the following string is evaluated as Python code and the
     resulting object is fed into a CBOR encoder. Otherwise it is interpreted
     as a Python byte string literal.
     """
     opts = pycompat.byteskwargs(opts)
 
     if opts['localssh'] and not repo:
         raise error.Abort(_('--localssh requires a repository'))
 
     if opts['peer'] and opts['peer'] not in ('raw', 'http2', 'ssh1', 'ssh2'):
         raise error.Abort(_('invalid value for --peer'),
                           hint=_('valid values are "raw", "ssh1", and "ssh2"'))
 
     if path and opts['localssh']:
         raise error.Abort(_('cannot specify --localssh with an explicit '
                             'path'))
 
     if ui.interactive():
         ui.write(_('(waiting for commands on stdin)\n'))
 
     blocks = list(_parsewirelangblocks(ui.fin))
 
     proc = None
     stdin = None
     stdout = None
     stderr = None
     opener = None
 
     if opts['localssh']:
         # We start the SSH server in its own process so there is process
         # separation. This prevents a whole class of potential bugs around
         # shared state from interfering with server operation.
         args = procutil.hgcmd() + [
             '-R', repo.root,
             'debugserve', '--sshstdio',
         ]
         proc = subprocess.Popen(pycompat.rapply(procutil.tonativestr, args),
                                 stdin=subprocess.PIPE,
                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                                 bufsize=0)
 
         stdin = proc.stdin
         stdout = proc.stdout
         stderr = proc.stderr
 
         # We turn the pipes into observers so we can log I/O.
         if ui.verbose or opts['peer'] == 'raw':
             stdin = util.makeloggingfileobject(ui, proc.stdin, b'i',
                                                logdata=True)
             stdout = util.makeloggingfileobject(ui, proc.stdout, b'o',
                                                 logdata=True)
             stderr = util.makeloggingfileobject(ui, proc.stderr, b'e',
                                                 logdata=True)
 
         # --localssh also implies the peer connection settings.
 
         url = 'ssh://localserver'
         autoreadstderr = not opts['noreadstderr']
 
         if opts['peer'] == 'ssh1':
             ui.write(_('creating ssh peer for wire protocol version 1\n'))
             peer = sshpeer.sshv1peer(ui, url, proc, stdin, stdout, stderr,
                                      None, autoreadstderr=autoreadstderr)
         elif opts['peer'] == 'ssh2':
             ui.write(_('creating ssh peer for wire protocol version 2\n'))
             peer = sshpeer.sshv2peer(ui, url, proc, stdin, stdout, stderr,
                                      None, autoreadstderr=autoreadstderr)
         elif opts['peer'] == 'raw':
             ui.write(_('using raw connection to peer\n'))
             peer = None
         else:
             ui.write(_('creating ssh peer from handshake results\n'))
             peer = sshpeer.makepeer(ui, url, proc, stdin, stdout, stderr,
                                     autoreadstderr=autoreadstderr)
 
     elif path:
         # We bypass hg.peer() so we can proxy the sockets.
         # TODO consider not doing this because we skip
         # ``hg.wirepeersetupfuncs`` and potentially other useful functionality.
         u = util.url(path)
         if u.scheme != 'http':
             raise error.Abort(_('only http:// paths are currently supported'))
 
         url, authinfo = u.authinfo()
         openerargs = {
             r'useragent': b'Mercurial debugwireproto',
         }
 
         # Turn pipes/sockets into observers so we can log I/O.
         if ui.verbose:
             openerargs.update({
                 r'loggingfh': ui,
                 r'loggingname': b's',
                 r'loggingopts': {
                     r'logdata': True,
                     r'logdataapis': False,
                 },
             })
 
         if ui.debugflag:
             openerargs[r'loggingopts'][r'logdataapis'] = True
 
         # Don't send default headers when in raw mode. This allows us to
         # bypass most of the behavior of our URL handling code so we can
         # have near complete control over what's sent on the wire.
         if opts['peer'] == 'raw':
             openerargs[r'sendaccept'] = False
 
         opener = urlmod.opener(ui, authinfo, **openerargs)
 
         if opts['peer'] == 'http2':
             ui.write(_('creating http peer for wire protocol version 2\n'))
             # We go through makepeer() because we need an API descriptor for
             # the peer instance to be useful.
             with ui.configoverride({
                 ('experimental', 'httppeer.advertise-v2'): True}):
                 if opts['nologhandshake']:
                     ui.pushbuffer()
 
                 peer = httppeer.makepeer(ui, path, opener=opener)
 
                 if opts['nologhandshake']:
                     ui.popbuffer()
 
             if not isinstance(peer, httppeer.httpv2peer):
                 raise error.Abort(_('could not instantiate HTTP peer for '
                                     'wire protocol version 2'),
                                   hint=_('the server may not have the feature '
                                          'enabled or is not allowing this '
                                          'client version'))
 
         elif opts['peer'] == 'raw':
             ui.write(_('using raw connection to peer\n'))
             peer = None
         elif opts['peer']:
             raise error.Abort(_('--peer %s not supported with HTTP peers') %
                               opts['peer'])
         else:
             peer = httppeer.makepeer(ui, path, opener=opener)
 
         # We /could/ populate stdin/stdout with sock.makefile()...
     else:
         raise error.Abort(_('unsupported connection configuration'))
 
     batchedcommands = None
 
     # Now perform actions based on the parsed wire language instructions.
     for action, lines in blocks:
         if action in ('raw', 'raw+'):
             if not stdin:
                 raise error.Abort(_('cannot call raw/raw+ on this peer'))
 
             # Concatenate the data together.
             data = ''.join(l.lstrip() for l in lines)
             data = stringutil.unescapestr(data)
             stdin.write(data)
 
             if action == 'raw+':
                 stdin.flush()
         elif action == 'flush':
             if not stdin:
                 raise error.Abort(_('cannot call flush on this peer'))
             stdin.flush()
         elif action.startswith('command'):
             if not peer:
                 raise error.Abort(_('cannot send commands unless peer instance '
                                     'is available'))
 
             command = action.split(' ', 1)[1]
 
             args = {}
             for line in lines:
                 # We need to allow empty values.
                 fields = line.lstrip().split(' ', 1)
                 if len(fields) == 1:
                     key = fields[0]
                     value = ''
                 else:
                     key, value = fields
 
                 if value.startswith('eval:'):
                     value = stringutil.evalpythonliteral(value[5:])
                 else:
                     value = stringutil.unescapestr(value)
 
                 args[key] = value
 
             if batchedcommands is not None:
                 batchedcommands.append((command, args))
                 continue
 
             ui.status(_('sending %s command\n') % command)
 
             if 'PUSHFILE' in args:
                 with open(args['PUSHFILE'], r'rb') as fh:
                     del args['PUSHFILE']
                     res, output = peer._callpush(command, fh,
                                                  **pycompat.strkwargs(args))
                     ui.status(_('result: %s\n') % stringutil.escapestr(res))
                     ui.status(_('remote output: %s\n') %
                               stringutil.escapestr(output))
             else:
                 with peer.commandexecutor() as e:
                     res = e.callcommand(command, args).result()
 
                 if isinstance(res, wireprotov2peer.commandresponse):
                     val = res.objects()
                     ui.status(_('response: %s\n') %
                               stringutil.pprint(val, bprefix=True, indent=2))
                 else:
                     ui.status(_('response: %s\n') %
                               stringutil.pprint(res, bprefix=True, indent=2))
 
         elif action == 'batchbegin':
             if batchedcommands is not None:
                 raise error.Abort(_('nested batchbegin not allowed'))
 
             batchedcommands = []
         elif action == 'batchsubmit':
             # There is a batching API we could go through. But it would be
             # difficult to normalize requests into function calls. It is easier
             # to bypass this layer and normalize to commands + args.
             ui.status(_('sending batch with %d sub-commands\n') %
                       len(batchedcommands))
             for i, chunk in enumerate(peer._submitbatch(batchedcommands)):
                 ui.status(_('response #%d: %s\n') %
                           (i, stringutil.escapestr(chunk)))
 
             batchedcommands = None
 
         elif action.startswith('httprequest '):
             if not opener:
                 raise error.Abort(_('cannot use httprequest without an HTTP '
                                     'peer'))
 
             request = action.split(' ', 2)
             if len(request) != 3:
                 raise error.Abort(_('invalid httprequest: expected format is '
                                     '"httprequest <method> <path>'))
 
             method, httppath = request[1:]
             headers = {}
             body = None
             frames = []
             for line in lines:
                 line = line.lstrip()
                 m = re.match(b'^([a-zA-Z0-9_-]+): (.*)$', line)
                 if m:
                     # Headers need to use native strings.
                     key = pycompat.strurl(m.group(1))
                     value = pycompat.strurl(m.group(2))
                     headers[key] = value
                     continue
 
                 if line.startswith(b'BODYFILE '):
                     with open(line.split(b' ', 1), 'rb') as fh:
                         body = fh.read()
                 elif line.startswith(b'frame '):
                     frame = wireprotoframing.makeframefromhumanstring(
                         line[len(b'frame '):])
 
                     frames.append(frame)
                 else:
                     raise error.Abort(_('unknown argument to httprequest: %s') %
                                       line)
 
             url = path + httppath
 
             if frames:
                 body = b''.join(bytes(f) for f in frames)
 
             req = urlmod.urlreq.request(pycompat.strurl(url), body, headers)
 
             # urllib.Request insists on using has_data() as a proxy for
             # determining the request method. Override that to use our
             # explicitly requested method.
             req.get_method = lambda: pycompat.sysstr(method)
 
             try:
                 res = opener.open(req)
                 body = res.read()
             except util.urlerr.urlerror as e:
                 # read() method must be called, but only exists in Python 2
                 getattr(e, 'read', lambda: None)()
                 continue
 
             ct = res.headers.get(r'Content-Type')
             if ct == r'application/mercurial-cbor':
                 ui.write(_('cbor> %s\n') %
                          stringutil.pprint(cborutil.decodeall(body),
                                            bprefix=True,
                                            indent=2))
 
         elif action == 'close':
             peer.close()
         elif action == 'readavailable':
             if not stdout or not stderr:
                 raise error.Abort(_('readavailable not available on this peer'))
 
             stdin.close()
             stdout.read()
             stderr.read()
 
         elif action == 'readline':
             if not stdout:
                 raise error.Abort(_('readline not available on this peer'))
             stdout.readline()
         elif action == 'ereadline':
             if not stderr:
                 raise error.Abort(_('ereadline not available on this peer'))
             stderr.readline()
         elif action.startswith('read '):
             count = int(action.split(' ', 1)[1])
             if not stdout:
                 raise error.Abort(_('read not available on this peer'))
             stdout.read(count)
         elif action.startswith('eread '):
             count = int(action.split(' ', 1)[1])
             if not stderr:
                 raise error.Abort(_('eread not available on this peer'))
             stderr.read(count)
         else:
             raise error.Abort(_('unknown action: %s') % action)
 
     if batchedcommands is not None:
         raise error.Abort(_('unclosed "batchbegin" request'))
 
     if peer:
         peer.close()
 
     if proc:
         proc.kill()

tests/run-tests.py

@@ -1,3316 +1,3325 b''
 #!/usr/bin/env python
 #
 # run-tests.py - Run a set of tests on Mercurial
 #
 # Copyright 2006 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 # Modifying this script is tricky because it has many modes:
 #   - serial (default) vs parallel (-jN, N > 1)
 #   - no coverage (default) vs coverage (-c, -C, -s)
 #   - temp install (default) vs specific hg script (--with-hg, --local)
 #   - tests are a mix of shell scripts and Python scripts
 #
 # If you change this script, it is recommended that you ensure you
 # haven't broken it by running it in various modes with a representative
 # sample of test scripts.  For example:
 #
 #  1) serial, no coverage, temp install:
 #      ./run-tests.py test-s*
 #  2) serial, no coverage, local hg:
 #      ./run-tests.py --local test-s*
 #  3) serial, coverage, temp install:
 #      ./run-tests.py -c test-s*
 #  4) serial, coverage, local hg:
 #      ./run-tests.py -c --local test-s*      # unsupported
 #  5) parallel, no coverage, temp install:
 #      ./run-tests.py -j2 test-s*
 #  6) parallel, no coverage, local hg:
 #      ./run-tests.py -j2 --local test-s*
 #  7) parallel, coverage, temp install:
 #      ./run-tests.py -j2 -c test-s*          # currently broken
 #  8) parallel, coverage, local install:
 #      ./run-tests.py -j2 -c --local test-s*  # unsupported (and broken)
 #  9) parallel, custom tmp dir:
 #      ./run-tests.py -j2 --tmpdir /tmp/myhgtests
 #  10) parallel, pure, tests that call run-tests:
 #      ./run-tests.py --pure `grep -l run-tests.py *.t`
 #
 # (You could use any subset of the tests: test-s* happens to match
 # enough that it's worth doing parallel runs, few enough that it
 # completes fairly quickly, includes both shell and Python scripts, and
 # includes some scripts that run daemon processes.)
 
 from __future__ import absolute_import, print_function
 
 import argparse
 import collections
 import difflib
 import distutils.version as version
 import errno
 import json
 import multiprocessing
 import os
 import random
 import re
 import shutil
 import signal
 import socket
 import subprocess
 import sys
 import sysconfig
 import tempfile
 import threading
 import time
 import unittest
 import uuid
 import xml.dom.minidom as minidom
 
 try:
     import Queue as queue
 except ImportError:
     import queue
 
 try:
     import shlex
     shellquote = shlex.quote
 except (ImportError, AttributeError):
     import pipes
     shellquote = pipes.quote
 
 if os.environ.get('RTUNICODEPEDANTRY', False):
     try:
         reload(sys)
         sys.setdefaultencoding("undefined")
     except NameError:
         pass
 
 processlock = threading.Lock()
 
 pygmentspresent = False
 # ANSI color is unsupported prior to Windows 10
 if os.name != 'nt':
     try: # is pygments installed
         import pygments
         import pygments.lexers as lexers
         import pygments.lexer as lexer
         import pygments.formatters as formatters
         import pygments.token as token
         import pygments.style as style
         pygmentspresent = True
         difflexer = lexers.DiffLexer()
         terminal256formatter = formatters.Terminal256Formatter()
     except ImportError:
         pass
 
 if pygmentspresent:
     class TestRunnerStyle(style.Style):
         default_style = ""
         skipped = token.string_to_tokentype("Token.Generic.Skipped")
         failed = token.string_to_tokentype("Token.Generic.Failed")
         skippedname = token.string_to_tokentype("Token.Generic.SName")
         failedname = token.string_to_tokentype("Token.Generic.FName")
         styles = {
             skipped:         '#e5e5e5',
             skippedname:     '#00ffff',
             failed:          '#7f0000',
             failedname:      '#ff0000',
         }
 
     class TestRunnerLexer(lexer.RegexLexer):
         testpattern = r'[\w-]+\.(t|py)(#[a-zA-Z0-9_\-\.]+)?'
         tokens = {
             'root': [
                 (r'^Skipped', token.Generic.Skipped, 'skipped'),
                 (r'^Failed ', token.Generic.Failed, 'failed'),
                 (r'^ERROR: ', token.Generic.Failed, 'failed'),
             ],
             'skipped': [
                 (testpattern, token.Generic.SName),
                 (r':.*', token.Generic.Skipped),
             ],
             'failed': [
                 (testpattern, token.Generic.FName),
                 (r'(:| ).*', token.Generic.Failed),
             ]
         }
 
     runnerformatter = formatters.Terminal256Formatter(style=TestRunnerStyle)
     runnerlexer = TestRunnerLexer()
 
 origenviron = os.environ.copy()
 
 if sys.version_info > (3, 5, 0):
     PYTHON3 = True
     xrange = range # we use xrange in one place, and we'd rather not use range
     def _bytespath(p):
         if p is None:
             return p
         return p.encode('utf-8')
 
     def _strpath(p):
         if p is None:
             return p
         return p.decode('utf-8')
 
     osenvironb = getattr(os, 'environb', None)
     if osenvironb is None:
         # Windows lacks os.environb, for instance.  A proxy over the real thing
         # instead of a copy allows the environment to be updated via bytes on
         # all platforms.
         class environbytes(object):
             def __init__(self, strenv):
                 self.__len__ = strenv.__len__
                 self.clear = strenv.clear
                 self._strenv = strenv
             def __getitem__(self, k):
                 v = self._strenv.__getitem__(_strpath(k))
                 return _bytespath(v)
             def __setitem__(self, k, v):
                 self._strenv.__setitem__(_strpath(k), _strpath(v))
             def __delitem__(self, k):
                 self._strenv.__delitem__(_strpath(k))
             def __contains__(self, k):
                 return self._strenv.__contains__(_strpath(k))
             def __iter__(self):
                 return iter([_bytespath(k) for k in iter(self._strenv)])
             def get(self, k, default=None):
                 v = self._strenv.get(_strpath(k), _strpath(default))
                 return _bytespath(v)
             def pop(self, k, default=None):
                 v = self._strenv.pop(_strpath(k), _strpath(default))
                 return _bytespath(v)
 
         osenvironb = environbytes(os.environ)
 
     getcwdb = getattr(os, 'getcwdb')
     if not getcwdb or os.name == 'nt':
         getcwdb = lambda: _bytespath(os.getcwd())
 
 elif sys.version_info >= (3, 0, 0):
     print('%s is only supported on Python 3.5+ and 2.7, not %s' %
           (sys.argv[0], '.'.join(str(v) for v in sys.version_info[:3])))
     sys.exit(70) # EX_SOFTWARE from `man 3 sysexit`
 else:
     PYTHON3 = False
 
     # In python 2.x, path operations are generally done using
     # bytestrings by default, so we don't have to do any extra
     # fiddling there. We define the wrapper functions anyway just to
     # help keep code consistent between platforms.
     def _bytespath(p):
         return p
 
     _strpath = _bytespath
     osenvironb = os.environ
     getcwdb = os.getcwd
 
 # For Windows support
 wifexited = getattr(os, "WIFEXITED", lambda x: False)
 
 # Whether to use IPv6
 def checksocketfamily(name, port=20058):
     """return true if we can listen on localhost using family=name
 
     name should be either 'AF_INET', or 'AF_INET6'.
     port being used is okay - EADDRINUSE is considered as successful.
     """
     family = getattr(socket, name, None)
     if family is None:
         return False
     try:
         s = socket.socket(family, socket.SOCK_STREAM)
         s.bind(('localhost', port))
         s.close()
         return True
     except socket.error as exc:
         if exc.errno == errno.EADDRINUSE:
             return True
         elif exc.errno in (errno.EADDRNOTAVAIL, errno.EPROTONOSUPPORT):
             return False
         else:
             raise
     else:
         return False
 
 # useipv6 will be set by parseargs
 useipv6 = None
 
 def checkportisavailable(port):
     """return true if a port seems free to bind on localhost"""
     if useipv6:
         family = socket.AF_INET6
     else:
         family = socket.AF_INET
     try:
         s = socket.socket(family, socket.SOCK_STREAM)
         s.bind(('localhost', port))
         s.close()
         return True
     except socket.error as exc:
         if exc.errno not in (errno.EADDRINUSE, errno.EADDRNOTAVAIL,
                              errno.EPROTONOSUPPORT):
             raise
     return False
 
 closefds = os.name == 'posix'
 def Popen4(cmd, wd, timeout, env=None):
     processlock.acquire()
     p = subprocess.Popen(_strpath(cmd), shell=True, bufsize=-1,
                          cwd=_strpath(wd), env=env,
                          close_fds=closefds,
                          stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                          stderr=subprocess.STDOUT)
     processlock.release()
 
     p.fromchild = p.stdout
     p.tochild = p.stdin
     p.childerr = p.stderr
 
     p.timeout = False
     if timeout:
         def t():
             start = time.time()
             while time.time() - start < timeout and p.returncode is None:
                 time.sleep(.1)
             p.timeout = True
             if p.returncode is None:
                 terminate(p)
         threading.Thread(target=t).start()
 
     return p
 
-PYTHON = _bytespath(sys.executable.replace('\\', '/'))
+if sys.executable:
+    sysexecutable = sys.executable
+elif os.environ.get('PYTHONEXECUTABLE'):
+    sysexecutable = os.environ['PYTHONEXECUTABLE']
+elif os.environ.get('PYTHON'):
+    sysexecutable = os.environ['PYTHON']
+else:
+    raise AssertionError('Could not find Python interpreter')
+
+PYTHON = _bytespath(sysexecutable.replace('\\', '/'))
 IMPL_PATH = b'PYTHONPATH'
 if 'java' in sys.platform:
     IMPL_PATH = b'JYTHONPATH'
 
 defaults = {
     'jobs': ('HGTEST_JOBS', multiprocessing.cpu_count()),
     'timeout': ('HGTEST_TIMEOUT', 180),
     'slowtimeout': ('HGTEST_SLOWTIMEOUT', 1500),
     'port': ('HGTEST_PORT', 20059),
     'shell': ('HGTEST_SHELL', 'sh'),
 }
 
 def canonpath(path):
     return os.path.realpath(os.path.expanduser(path))
 
 def parselistfiles(files, listtype, warn=True):
     entries = dict()
     for filename in files:
         try:
             path = os.path.expanduser(os.path.expandvars(filename))
             f = open(path, "rb")
         except IOError as err:
             if err.errno != errno.ENOENT:
                 raise
             if warn:
                 print("warning: no such %s file: %s" % (listtype, filename))
             continue
 
         for line in f.readlines():
             line = line.split(b'#', 1)[0].strip()
             if line:
                 entries[line] = filename
 
         f.close()
     return entries
 
 def parsettestcases(path):
     """read a .t test file, return a set of test case names
 
     If path does not exist, return an empty set.
     """
     cases = []
     try:
         with open(path, 'rb') as f:
             for l in f:
                 if l.startswith(b'#testcases '):
                     cases.append(sorted(l[11:].split()))
     except IOError as ex:
         if ex.errno != errno.ENOENT:
             raise
     return cases
 
 def getparser():
     """Obtain the OptionParser used by the CLI."""
     parser = argparse.ArgumentParser(usage='%(prog)s [options] [tests]')
 
     selection = parser.add_argument_group('Test Selection')
     selection.add_argument('--allow-slow-tests', action='store_true',
         help='allow extremely slow tests')
     selection.add_argument("--blacklist", action="append",
         help="skip tests listed in the specified blacklist file")
     selection.add_argument("--changed",
         help="run tests that are changed in parent rev or working directory")
     selection.add_argument("-k", "--keywords",
         help="run tests matching keywords")
     selection.add_argument("-r", "--retest", action="store_true",
         help = "retest failed tests")
     selection.add_argument("--test-list", action="append",
         help="read tests to run from the specified file")
     selection.add_argument("--whitelist", action="append",
         help="always run tests listed in the specified whitelist file")
     selection.add_argument('tests', metavar='TESTS', nargs='*',
                         help='Tests to run')
 
     harness = parser.add_argument_group('Test Harness Behavior')
     harness.add_argument('--bisect-repo',
                         metavar='bisect_repo',
                         help=("Path of a repo to bisect. Use together with "
                               "--known-good-rev"))
     harness.add_argument("-d", "--debug", action="store_true",
         help="debug mode: write output of test scripts to console"
              " rather than capturing and diffing it (disables timeout)")
     harness.add_argument("-f", "--first", action="store_true",
         help="exit on the first test failure")
     harness.add_argument("-i", "--interactive", action="store_true",
         help="prompt to accept changed output")
     harness.add_argument("-j", "--jobs", type=int,
         help="number of jobs to run in parallel"
              " (default: $%s or %d)" % defaults['jobs'])
     harness.add_argument("--keep-tmpdir", action="store_true",
         help="keep temporary directory after running tests")
     harness.add_argument('--known-good-rev',
                         metavar="known_good_rev",
                         help=("Automatically bisect any failures using this "
                               "revision as a known-good revision."))
     harness.add_argument("--list-tests", action="store_true",
         help="list tests instead of running them")
     harness.add_argument("--loop", action="store_true",
         help="loop tests repeatedly")
     harness.add_argument('--random', action="store_true",
         help='run tests in random order')
     harness.add_argument('--order-by-runtime', action="store_true",
         help='run slowest tests first, according to .testtimes')
     harness.add_argument("-p", "--port", type=int,
         help="port on which servers should listen"
              " (default: $%s or %d)" % defaults['port'])
     harness.add_argument('--profile-runner', action='store_true',
                         help='run statprof on run-tests')
     harness.add_argument("-R", "--restart", action="store_true",
         help="restart at last error")
     harness.add_argument("--runs-per-test", type=int, dest="runs_per_test",
         help="run each test N times (default=1)", default=1)
     harness.add_argument("--shell",
         help="shell to use (default: $%s or %s)" % defaults['shell'])
     harness.add_argument('--showchannels', action='store_true',
                         help='show scheduling channels')
     harness.add_argument("--slowtimeout", type=int,
         help="kill errant slow tests after SLOWTIMEOUT seconds"
              " (default: $%s or %d)" % defaults['slowtimeout'])
     harness.add_argument("-t", "--timeout", type=int,
         help="kill errant tests after TIMEOUT seconds"
              " (default: $%s or %d)" % defaults['timeout'])
     harness.add_argument("--tmpdir",
         help="run tests in the given temporary directory"
              " (implies --keep-tmpdir)")
     harness.add_argument("-v", "--verbose", action="store_true",
         help="output verbose messages")
 
     hgconf = parser.add_argument_group('Mercurial Configuration')
     hgconf.add_argument("--chg", action="store_true",
         help="install and use chg wrapper in place of hg")
     hgconf.add_argument("--compiler",
         help="compiler to build with")
     hgconf.add_argument('--extra-config-opt', action="append", default=[],
         help='set the given config opt in the test hgrc')
     hgconf.add_argument("-l", "--local", action="store_true",
         help="shortcut for --with-hg=<testdir>/../hg, "
              "and --with-chg=<testdir>/../contrib/chg/chg if --chg is set")
     hgconf.add_argument("--ipv6", action="store_true",
         help="prefer IPv6 to IPv4 for network related tests")
     hgconf.add_argument("--pure", action="store_true",
         help="use pure Python code instead of C extensions")
     hgconf.add_argument("-3", "--py3-warnings", action="store_true",
         help="enable Py3k warnings on Python 2.7+")
     hgconf.add_argument("--with-chg", metavar="CHG",
         help="use specified chg wrapper in place of hg")
     hgconf.add_argument("--with-hg",
         metavar="HG",
         help="test using specified hg script rather than a "
              "temporary installation")
 
     reporting = parser.add_argument_group('Results Reporting')
     reporting.add_argument("-C", "--annotate", action="store_true",
         help="output files annotated with coverage")
     reporting.add_argument("--color", choices=["always", "auto", "never"],
         default=os.environ.get('HGRUNTESTSCOLOR', 'auto'),
         help="colorisation: always|auto|never (default: auto)")
     reporting.add_argument("-c", "--cover", action="store_true",
         help="print a test coverage report")
     reporting.add_argument('--exceptions', action='store_true',
         help='log all exceptions and generate an exception report')
     reporting.add_argument("-H", "--htmlcov", action="store_true",
         help="create an HTML report of the coverage of the files")
     reporting.add_argument("--json", action="store_true",
         help="store test result data in 'report.json' file")
     reporting.add_argument("--outputdir",
         help="directory to write error logs to (default=test directory)")
     reporting.add_argument("-n", "--nodiff", action="store_true",
         help="skip showing test changes")
     reporting.add_argument("-S", "--noskips", action="store_true",
         help="don't report skip tests verbosely")
     reporting.add_argument("--time", action="store_true",
         help="time how long each test takes")
     reporting.add_argument("--view",
         help="external diff viewer")
     reporting.add_argument("--xunit",
         help="record xunit results at specified path")
 
     for option, (envvar, default) in defaults.items():
         defaults[option] = type(default)(os.environ.get(envvar, default))
     parser.set_defaults(**defaults)
 
     return parser
 
 def parseargs(args, parser):
     """Parse arguments with our OptionParser and validate results."""
     options = parser.parse_args(args)
 
     # jython is always pure
     if 'java' in sys.platform or '__pypy__' in sys.modules:
         options.pure = True
 
     if options.with_hg:
         options.with_hg = canonpath(_bytespath(options.with_hg))
         if not (os.path.isfile(options.with_hg) and
                 os.access(options.with_hg, os.X_OK)):
             parser.error('--with-hg must specify an executable hg script')
         if os.path.basename(options.with_hg) not in [b'hg', b'hg.exe']:
             sys.stderr.write('warning: --with-hg should specify an hg script\n')
             sys.stderr.flush()
     if options.local:
         testdir = os.path.dirname(_bytespath(canonpath(sys.argv[0])))
         reporootdir = os.path.dirname(testdir)
         pathandattrs = [(b'hg', 'with_hg')]
         if options.chg:
             pathandattrs.append((b'contrib/chg/chg', 'with_chg'))
         for relpath, attr in pathandattrs:
             binpath = os.path.join(reporootdir, relpath)
             if os.name != 'nt' and not os.access(binpath, os.X_OK):
                 parser.error('--local specified, but %r not found or '
                              'not executable' % binpath)
             setattr(options, attr, binpath)
 
     if (options.chg or options.with_chg) and os.name == 'nt':
         parser.error('chg does not work on %s' % os.name)
     if options.with_chg:
         options.chg = False  # no installation to temporary location
         options.with_chg = canonpath(_bytespath(options.with_chg))
         if not (os.path.isfile(options.with_chg) and
                 os.access(options.with_chg, os.X_OK)):
             parser.error('--with-chg must specify a chg executable')
     if options.chg and options.with_hg:
         # chg shares installation location with hg
         parser.error('--chg does not work when --with-hg is specified '
                      '(use --with-chg instead)')
 
     if options.color == 'always' and not pygmentspresent:
         sys.stderr.write('warning: --color=always ignored because '
                          'pygments is not installed\n')
 
     if options.bisect_repo and not options.known_good_rev:
         parser.error("--bisect-repo cannot be used without --known-good-rev")
 
     global useipv6
     if options.ipv6:
         useipv6 = checksocketfamily('AF_INET6')
     else:
         # only use IPv6 if IPv4 is unavailable and IPv6 is available
         useipv6 = ((not checksocketfamily('AF_INET'))
                    and checksocketfamily('AF_INET6'))
 
     options.anycoverage = options.cover or options.annotate or options.htmlcov
     if options.anycoverage:
         try:
             import coverage
             covver = version.StrictVersion(coverage.__version__).version
             if covver < (3, 3):
                 parser.error('coverage options require coverage 3.3 or later')
         except ImportError:
             parser.error('coverage options now require the coverage package')
 
     if options.anycoverage and options.local:
         # this needs some path mangling somewhere, I guess
         parser.error("sorry, coverage options do not work when --local "
                      "is specified")
 
     if options.anycoverage and options.with_hg:
         parser.error("sorry, coverage options do not work when --with-hg "
                      "is specified")
 
     global verbose
     if options.verbose:
         verbose = ''
 
     if options.tmpdir:
         options.tmpdir = canonpath(options.tmpdir)
 
     if options.jobs < 1:
         parser.error('--jobs must be positive')
     if options.interactive and options.debug:
         parser.error("-i/--interactive and -d/--debug are incompatible")
     if options.debug:
         if options.timeout != defaults['timeout']:
             sys.stderr.write(
                 'warning: --timeout option ignored with --debug\n')
         if options.slowtimeout != defaults['slowtimeout']:
             sys.stderr.write(
                 'warning: --slowtimeout option ignored with --debug\n')
         options.timeout = 0
         options.slowtimeout = 0
     if options.py3_warnings:
         if PYTHON3:
             parser.error(
                 '--py3-warnings can only be used on Python 2.7')
 
     if options.blacklist:
         options.blacklist = parselistfiles(options.blacklist, 'blacklist')
     if options.whitelist:
         options.whitelisted = parselistfiles(options.whitelist, 'whitelist')
     else:
         options.whitelisted = {}
 
     if options.showchannels:
         options.nodiff = True
 
     return options
 
 def rename(src, dst):
     """Like os.rename(), trade atomicity and opened files friendliness
     for existing destination support.
     """
     shutil.copy(src, dst)
     os.remove(src)
 
 def makecleanable(path):
     """Try to fix directory permission recursively so that the entire tree
     can be deleted"""
     for dirpath, dirnames, _filenames in os.walk(path, topdown=True):
         for d in dirnames:
             p = os.path.join(dirpath, d)
             try:
                 os.chmod(p, os.stat(p).st_mode & 0o777 | 0o700)  # chmod u+rwx
             except OSError:
                 pass
 
 _unified_diff = difflib.unified_diff
 if PYTHON3:
     import functools
     _unified_diff = functools.partial(difflib.diff_bytes, difflib.unified_diff)
 
 def getdiff(expected, output, ref, err):
     servefail = False
     lines = []
     for line in _unified_diff(expected, output, ref, err):
         if line.startswith(b'+++') or line.startswith(b'---'):
             line = line.replace(b'\\', b'/')
             if line.endswith(b' \n'):
                 line = line[:-2] + b'\n'
         lines.append(line)
         if not servefail and line.startswith(
                              b'+  abort: child process failed to start'):
             servefail = True
 
     return servefail, lines
 
 verbose = False
 def vlog(*msg):
     """Log only when in verbose mode."""
     if verbose is False:
         return
 
     return log(*msg)
 
 # Bytes that break XML even in a CDATA block: control characters 0-31
 # sans \t, \n and \r
 CDATA_EVIL = re.compile(br"[\000-\010\013\014\016-\037]")
 
 # Match feature conditionalized output lines in the form, capturing the feature
 # list in group 2, and the preceeding line output in group 1:
 #
 #   output..output (feature !)\n
 optline = re.compile(br'(.*) \((.+?) !\)\n$')
 
 def cdatasafe(data):
     """Make a string safe to include in a CDATA block.
 
     Certain control characters are illegal in a CDATA block, and
     there's no way to include a ]]> in a CDATA either. This function
     replaces illegal bytes with ? and adds a space between the ]] so
     that it won't break the CDATA block.
     """
     return CDATA_EVIL.sub(b'?', data).replace(b']]>', b'] ]>')
 
 def log(*msg):
     """Log something to stdout.
 
     Arguments are strings to print.
     """
     with iolock:
         if verbose:
             print(verbose, end=' ')
         for m in msg:
             print(m, end=' ')
         print()
         sys.stdout.flush()
 
 def highlightdiff(line, color):
     if not color:
         return line
     assert pygmentspresent
     return pygments.highlight(line.decode('latin1'), difflexer,
                               terminal256formatter).encode('latin1')
 
 def highlightmsg(msg, color):
     if not color:
         return msg
     assert pygmentspresent
     return pygments.highlight(msg, runnerlexer, runnerformatter)
 
 def terminate(proc):
     """Terminate subprocess"""
     vlog('# Terminating process %d' % proc.pid)
     try:
         proc.terminate()
     except OSError:
         pass
 
 def killdaemons(pidfile):
     import killdaemons as killmod
     return killmod.killdaemons(pidfile, tryhard=False, remove=True,
                                logfn=vlog)
 
 class Test(unittest.TestCase):
     """Encapsulates a single, runnable test.
 
     While this class conforms to the unittest.TestCase API, it differs in that
     instances need to be instantiated manually. (Typically, unittest.TestCase
     classes are instantiated automatically by scanning modules.)
     """
 
     # Status code reserved for skipped tests (used by hghave).
     SKIPPED_STATUS = 80
 
     def __init__(self, path, outputdir, tmpdir, keeptmpdir=False,
                  debug=False,
                  first=False,
                  timeout=None,
                  startport=None, extraconfigopts=None,
                  py3warnings=False, shell=None, hgcommand=None,
                  slowtimeout=None, usechg=False,
                  useipv6=False):
         """Create a test from parameters.
 
         path is the full path to the file defining the test.
 
         tmpdir is the main temporary directory to use for this test.
 
         keeptmpdir determines whether to keep the test's temporary directory
         after execution. It defaults to removal (False).
 
         debug mode will make the test execute verbosely, with unfiltered
         output.
 
         timeout controls the maximum run time of the test. It is ignored when
         debug is True. See slowtimeout for tests with #require slow.
 
         slowtimeout overrides timeout if the test has #require slow.
 
         startport controls the starting port number to use for this test. Each
         test will reserve 3 port numbers for execution. It is the caller's
         responsibility to allocate a non-overlapping port range to Test
         instances.
 
         extraconfigopts is an iterable of extra hgrc config options. Values
         must have the form "key=value" (something understood by hgrc). Values
         of the form "foo.key=value" will result in "[foo] key=value".
 
         py3warnings enables Py3k warnings.
 
         shell is the shell to execute tests in.
         """
         if timeout is None:
             timeout = defaults['timeout']
         if startport is None:
             startport = defaults['port']
         if slowtimeout is None:
             slowtimeout = defaults['slowtimeout']
         self.path = path
         self.bname = os.path.basename(path)
         self.name = _strpath(self.bname)
         self._testdir = os.path.dirname(path)
         self._outputdir = outputdir
         self._tmpname = os.path.basename(path)
         self.errpath = os.path.join(self._outputdir, b'%s.err' % self.bname)
 
         self._threadtmp = tmpdir
         self._keeptmpdir = keeptmpdir
         self._debug = debug
         self._first = first
         self._timeout = timeout
         self._slowtimeout = slowtimeout
         self._startport = startport
         self._extraconfigopts = extraconfigopts or []
         self._py3warnings = py3warnings
         self._shell = _bytespath(shell)
         self._hgcommand = hgcommand or b'hg'
         self._usechg = usechg
         self._useipv6 = useipv6
 
         self._aborted = False
         self._daemonpids = []
         self._finished = None
         self._ret = None
         self._out = None
         self._skipped = None
         self._testtmp = None
         self._chgsockdir = None
 
         self._refout = self.readrefout()
 
     def readrefout(self):
         """read reference output"""
         # If we're not in --debug mode and reference output file exists,
         # check test output against it.
         if self._debug:
             return None # to match "out is None"
         elif os.path.exists(self.refpath):
             with open(self.refpath, 'rb') as f:
                 return f.read().splitlines(True)
         else:
             return []
 
     # needed to get base class __repr__ running
     @property
     def _testMethodName(self):
         return self.name
 
     def __str__(self):
         return self.name
 
     def shortDescription(self):
         return self.name
 
     def setUp(self):
         """Tasks to perform before run()."""
         self._finished = False
         self._ret = None
         self._out = None
         self._skipped = None
 
         try:
             os.mkdir(self._threadtmp)
         except OSError as e:
             if e.errno != errno.EEXIST:
                 raise
 
         name = self._tmpname
         self._testtmp = os.path.join(self._threadtmp, name)
         os.mkdir(self._testtmp)
 
         # Remove any previous output files.
         if os.path.exists(self.errpath):
             try:
                 os.remove(self.errpath)
             except OSError as e:
                 # We might have raced another test to clean up a .err
                 # file, so ignore ENOENT when removing a previous .err
                 # file.
                 if e.errno != errno.ENOENT:
                     raise
 
         if self._usechg:
             self._chgsockdir = os.path.join(self._threadtmp,
                                             b'%s.chgsock' % name)
             os.mkdir(self._chgsockdir)
 
     def run(self, result):
         """Run this test and report results against a TestResult instance."""
         # This function is extremely similar to unittest.TestCase.run(). Once
         # we require Python 2.7 (or at least its version of unittest), this
         # function can largely go away.
         self._result = result
         result.startTest(self)
         try:
             try:
                 self.setUp()
             except (KeyboardInterrupt, SystemExit):
                 self._aborted = True
                 raise
             except Exception:
                 result.addError(self, sys.exc_info())
                 return
 
             success = False
             try:
                 self.runTest()
             except KeyboardInterrupt:
                 self._aborted = True
                 raise
             except unittest.SkipTest as e:
                 result.addSkip(self, str(e))
                 # The base class will have already counted this as a
                 # test we "ran", but we want to exclude skipped tests
                 # from those we count towards those run.
                 result.testsRun -= 1
             except self.failureException as e:
                 # This differs from unittest in that we don't capture
                 # the stack trace. This is for historical reasons and
                 # this decision could be revisited in the future,
                 # especially for PythonTest instances.
                 if result.addFailure(self, str(e)):
                     success = True
             except Exception:
                 result.addError(self, sys.exc_info())
             else:
                 success = True
 
             try:
                 self.tearDown()
             except (KeyboardInterrupt, SystemExit):
                 self._aborted = True
                 raise
             except Exception:
                 result.addError(self, sys.exc_info())
                 success = False
 
             if success:
                 result.addSuccess(self)
         finally:
             result.stopTest(self, interrupted=self._aborted)
 
     def runTest(self):
         """Run this test instance.
 
         This will return a tuple describing the result of the test.
         """
         env = self._getenv()
         self._genrestoreenv(env)
         self._daemonpids.append(env['DAEMON_PIDS'])
         self._createhgrc(env['HGRCPATH'])
 
         vlog('# Test', self.name)
 
         ret, out = self._run(env)
         self._finished = True
         self._ret = ret
         self._out = out
 
         def describe(ret):
             if ret < 0:
                 return 'killed by signal: %d' % -ret
             return 'returned error code %d' % ret
 
         self._skipped = False
 
         if ret == self.SKIPPED_STATUS:
             if out is None: # Debug mode, nothing to parse.
                 missing = ['unknown']
                 failed = None
             else:
                 missing, failed = TTest.parsehghaveoutput(out)
 
             if not missing:
                 missing = ['skipped']
 
             if failed:
                 self.fail('hg have failed checking for %s' % failed[-1])
             else:
                 self._skipped = True
                 raise unittest.SkipTest(missing[-1])
         elif ret == 'timeout':
             self.fail('timed out')
         elif ret is False:
             self.fail('no result code from test')
         elif out != self._refout:
             # Diff generation may rely on written .err file.
             if ((ret != 0 or out != self._refout) and not self._skipped
                 and not self._debug):
                 with open(self.errpath, 'wb') as f:
                     for line in out:
                         f.write(line)
 
             # The result object handles diff calculation for us.
             with firstlock:
                 if self._result.addOutputMismatch(self, ret, out, self._refout):
                     # change was accepted, skip failing
                     return
                 if self._first:
                     global firsterror
                     firsterror = True
 
             if ret:
                 msg = 'output changed and ' + describe(ret)
             else:
                 msg = 'output changed'
 
             self.fail(msg)
         elif ret:
             self.fail(describe(ret))
 
     def tearDown(self):
         """Tasks to perform after run()."""
         for entry in self._daemonpids:
             killdaemons(entry)
         self._daemonpids = []
 
         if self._keeptmpdir:
             log('\nKeeping testtmp dir: %s\nKeeping threadtmp dir: %s' %
                 (self._testtmp.decode('utf-8'),
                  self._threadtmp.decode('utf-8')))
         else:
             try:
                 shutil.rmtree(self._testtmp)
             except OSError:
                 # unreadable directory may be left in $TESTTMP; fix permission
                 # and try again
                 makecleanable(self._testtmp)
                 shutil.rmtree(self._testtmp, True)
             shutil.rmtree(self._threadtmp, True)
 
         if self._usechg:
             # chgservers will stop automatically after they find the socket
             # files are deleted
             shutil.rmtree(self._chgsockdir, True)
 
         if ((self._ret != 0 or self._out != self._refout) and not self._skipped
             and not self._debug and self._out):
             with open(self.errpath, 'wb') as f:
                 for line in self._out:
                     f.write(line)
 
         vlog("# Ret was:", self._ret, '(%s)' % self.name)
 
     def _run(self, env):
         # This should be implemented in child classes to run tests.
         raise unittest.SkipTest('unknown test type')
 
     def abort(self):
         """Terminate execution of this test."""
         self._aborted = True
 
     def _portmap(self, i):
         offset = b'' if i == 0 else b'%d' % i
         return (br':%d\b' % (self._startport + i), b':$HGPORT%s' % offset)
 
     def _getreplacements(self):
         """Obtain a mapping of text replacements to apply to test output.
 
         Test output needs to be normalized so it can be compared to expected
         output. This function defines how some of that normalization will
         occur.
         """
         r = [
             # This list should be parallel to defineport in _getenv
             self._portmap(0),
             self._portmap(1),
             self._portmap(2),
             (br'([^0-9])%s' % re.escape(self._localip()), br'\1$LOCALIP'),
             (br'\bHG_TXNID=TXN:[a-f0-9]{40}\b', br'HG_TXNID=TXN:$ID$'),
             ]
         r.append((self._escapepath(self._testtmp), b'$TESTTMP'))
 
         replacementfile = os.path.join(self._testdir, b'common-pattern.py')
 
         if os.path.exists(replacementfile):
             data = {}
             with open(replacementfile, mode='rb') as source:
                 # the intermediate 'compile' step help with debugging
                 code = compile(source.read(), replacementfile, 'exec')
                 exec(code, data)
                 for value in data.get('substitutions', ()):
                     if len(value) != 2:
                         msg = 'malformatted substitution in %s: %r'
                         msg %= (replacementfile, value)
                         raise ValueError(msg)
                     r.append(value)
         return r
 
     def _escapepath(self, p):
         if os.name == 'nt':
             return (
                 (b''.join(c.isalpha() and b'[%s%s]' % (c.lower(), c.upper()) or
                     c in b'/\\' and br'[/\\]' or c.isdigit() and c or b'\\' + c
                     for c in [p[i:i + 1] for i in range(len(p))]))
             )
         else:
             return re.escape(p)
 
     def _localip(self):
         if self._useipv6:
             return b'::1'
         else:
             return b'127.0.0.1'
 
     def _genrestoreenv(self, testenv):
         """Generate a script that can be used by tests to restore the original
         environment."""
         # Put the restoreenv script inside self._threadtmp
         scriptpath = os.path.join(self._threadtmp, b'restoreenv.sh')
         testenv['HGTEST_RESTOREENV'] = _strpath(scriptpath)
 
         # Only restore environment variable names that the shell allows
         # us to export.
         name_regex = re.compile('^[a-zA-Z][a-zA-Z0-9_]*$')
 
         # Do not restore these variables; otherwise tests would fail.
         reqnames = {'PYTHON', 'TESTDIR', 'TESTTMP'}
 
         with open(scriptpath, 'w') as envf:
             for name, value in origenviron.items():
                 if not name_regex.match(name):
                     # Skip environment variables with unusual names not
                     # allowed by most shells.
                     continue
                 if name in reqnames:
                     continue
                 envf.write('%s=%s\n' % (name, shellquote(value)))
 
             for name in testenv:
                 if name in origenviron or name in reqnames:
                     continue
                 envf.write('unset %s\n' % (name,))
 
     def _getenv(self):
         """Obtain environment variables to use during test execution."""
         def defineport(i):
             offset = '' if i == 0 else '%s' % i
             env["HGPORT%s" % offset] = '%s' % (self._startport + i)
         env = os.environ.copy()
         env['PYTHONUSERBASE'] = sysconfig.get_config_var('userbase') or ''
         env['HGEMITWARNINGS'] = '1'
         env['TESTTMP'] = _strpath(self._testtmp)
         env['TESTNAME'] = self.name
         env['HOME'] = _strpath(self._testtmp)
         # This number should match portneeded in _getport
         for port in xrange(3):
             # This list should be parallel to _portmap in _getreplacements
             defineport(port)
         env["HGRCPATH"] = _strpath(os.path.join(self._threadtmp, b'.hgrc'))
         env["DAEMON_PIDS"] = _strpath(os.path.join(self._threadtmp,
                                                    b'daemon.pids'))
-        env["HGEDITOR"] = ('"' + sys.executable + '"'
+        env["HGEDITOR"] = ('"' + sysexecutable + '"'
                            + ' -c "import sys; sys.exit(0)"')
         env["HGUSER"]   = "test"
         env["HGENCODING"] = "ascii"
         env["HGENCODINGMODE"] = "strict"
         env["HGHOSTNAME"] = "test-hostname"
         env['HGIPV6'] = str(int(self._useipv6))
         # See contrib/catapipe.py for how to use this functionality.
         if 'HGTESTCATAPULTSERVERPIPE' not in env:
             # If we don't have HGTESTCATAPULTSERVERPIPE explicitly set, pull the
             # non-test one in as a default, otherwise set to devnull
             env['HGTESTCATAPULTSERVERPIPE'] = env.get(
                 'HGCATAPULTSERVERPIPE', os.devnull)
 
         extraextensions = []
         for opt in self._extraconfigopts:
             section, key = opt.encode('utf-8').split(b'.', 1)
             if section != 'extensions':
                 continue
             name = key.split(b'=', 1)[0]
             extraextensions.append(name)
 
         if extraextensions:
             env['HGTESTEXTRAEXTENSIONS'] = b' '.join(extraextensions)
 
         # LOCALIP could be ::1 or 127.0.0.1. Useful for tests that require raw
         # IP addresses.
         env['LOCALIP'] = _strpath(self._localip())
 
         # This has the same effect as Py_LegacyWindowsStdioFlag in exewrapper.c,
         # but this is needed for testing python instances like dummyssh,
         # dummysmtpd.py, and dumbhttp.py.
         if PYTHON3 and os.name == 'nt':
             env['PYTHONLEGACYWINDOWSSTDIO'] = '1'
 
         # Reset some environment variables to well-known values so that
         # the tests produce repeatable output.
         env['LANG'] = env['LC_ALL'] = env['LANGUAGE'] = 'C'
         env['TZ'] = 'GMT'
         env["EMAIL"] = "Foo Bar <[e-mail]>"
         env['COLUMNS'] = '80'
         env['TERM'] = 'xterm'
 
         dropped = [
             'CDPATH',
             'CHGDEBUG',
             'EDITOR',
             'GREP_OPTIONS',
             'HG',
             'HGMERGE',
             'HGPLAIN',
             'HGPLAINEXCEPT',
             'HGPROF',
             'http_proxy',
             'no_proxy',
             'NO_PROXY',
             'PAGER',
             'VISUAL',
         ]
 
         for k in dropped:
             if k in env:
                 del env[k]
 
         # unset env related to hooks
         for k in list(env):
             if k.startswith('HG_'):
                 del env[k]
 
         if self._usechg:
             env['CHGSOCKNAME'] = os.path.join(self._chgsockdir, b'server')
 
         return env
 
     def _createhgrc(self, path):
         """Create an hgrc file for this test."""
         with open(path, 'wb') as hgrc:
             hgrc.write(b'[ui]\n')
             hgrc.write(b'slash = True\n')
             hgrc.write(b'interactive = False\n')
             hgrc.write(b'merge = internal:merge\n')
             hgrc.write(b'mergemarkers = detailed\n')
             hgrc.write(b'promptecho = True\n')
             hgrc.write(b'[defaults]\n')
             hgrc.write(b'[devel]\n')
             hgrc.write(b'all-warnings = true\n')
             hgrc.write(b'default-date = 0 0\n')
             hgrc.write(b'[largefiles]\n')
             hgrc.write(b'usercache = %s\n' %
                        (os.path.join(self._testtmp, b'.cache/largefiles')))
             hgrc.write(b'[lfs]\n')
             hgrc.write(b'usercache = %s\n' %
                        (os.path.join(self._testtmp, b'.cache/lfs')))
             hgrc.write(b'[web]\n')
             hgrc.write(b'address = localhost\n')
             hgrc.write(b'ipv6 = %s\n' % str(self._useipv6).encode('ascii'))
             hgrc.write(b'server-header = testing stub value\n')
 
             for opt in self._extraconfigopts:
                 section, key = opt.encode('utf-8').split(b'.', 1)
                 assert b'=' in key, ('extra config opt %s must '
                                      'have an = for assignment' % opt)
                 hgrc.write(b'[%s]\n%s\n' % (section, key))
 
     def fail(self, msg):
         # unittest differentiates between errored and failed.
         # Failed is denoted by AssertionError (by default at least).
         raise AssertionError(msg)
 
     def _runcommand(self, cmd, env, normalizenewlines=False):
         """Run command in a sub-process, capturing the output (stdout and
         stderr).
 
         Return a tuple (exitcode, output). output is None in debug mode.
         """
         if self._debug:
             proc = subprocess.Popen(_strpath(cmd), shell=True,
                                     cwd=_strpath(self._testtmp),
                                     env=env)
             ret = proc.wait()
             return (ret, None)
 
         proc = Popen4(cmd, self._testtmp, self._timeout, env)
         def cleanup():
             terminate(proc)
             ret = proc.wait()
             if ret == 0:
                 ret = signal.SIGTERM << 8
             killdaemons(env['DAEMON_PIDS'])
             return ret
 
         proc.tochild.close()
 
         try:
             output = proc.fromchild.read()
         except KeyboardInterrupt:
             vlog('# Handling keyboard interrupt')
             cleanup()
             raise
 
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
 
         if proc.timeout:
             ret = 'timeout'
 
         if ret:
             killdaemons(env['DAEMON_PIDS'])
 
         for s, r in self._getreplacements():
             output = re.sub(s, r, output)
 
         if normalizenewlines:
             output = output.replace(b'\r\n', b'\n')
 
         return ret, output.splitlines(True)
 
 class PythonTest(Test):
     """A Python-based test."""
 
     @property
     def refpath(self):
         return os.path.join(self._testdir, b'%s.out' % self.bname)
 
     def _run(self, env):
         py3switch = self._py3warnings and b' -3' or b''
         # Quote the python(3) executable for Windows
         cmd = b'"%s"%s "%s"' % (PYTHON, py3switch, self.path)
         vlog("# Running", cmd)
         normalizenewlines = os.name == 'nt'
         result = self._runcommand(cmd, env,
                                   normalizenewlines=normalizenewlines)
         if self._aborted:
             raise KeyboardInterrupt()
 
         return result
 
 # Some glob patterns apply only in some circumstances, so the script
 # might want to remove (glob) annotations that otherwise should be
 # retained.
 checkcodeglobpats = [
     # On Windows it looks like \ doesn't require a (glob), but we know
     # better.
     re.compile(br'^pushing to \$TESTTMP/.*[^)]$'),
     re.compile(br'^moving \S+/.*[^)]$'),
     re.compile(br'^pulling from \$TESTTMP/.*[^)]$'),
     # Not all platforms have 127.0.0.1 as loopback (though most do),
     # so we always glob that too.
     re.compile(br'.*\$LOCALIP.*$'),
 ]
 
 bchr = chr
 if PYTHON3:
     bchr = lambda x: bytes([x])
 
 class TTest(Test):
     """A "t test" is a test backed by a .t file."""
 
     SKIPPED_PREFIX = b'skipped: '
     FAILED_PREFIX = b'hghave check failed: '
     NEEDESCAPE = re.compile(br'[\x00-\x08\x0b-\x1f\x7f-\xff]').search
 
     ESCAPESUB = re.compile(br'[\x00-\x08\x0b-\x1f\\\x7f-\xff]').sub
     ESCAPEMAP = dict((bchr(i), br'\x%02x' % i) for i in range(256))
     ESCAPEMAP.update({b'\\': b'\\\\', b'\r': br'\r'})
 
     def __init__(self, path, *args, **kwds):
         # accept an extra "case" parameter
         case = kwds.pop('case', [])
         self._case = case
         self._allcases = {x for y in parsettestcases(path) for x in y}
         super(TTest, self).__init__(path, *args, **kwds)
         if case:
             casepath = b'#'.join(case)
             self.name = '%s#%s' % (self.name, _strpath(casepath))
             self.errpath = b'%s#%s.err' % (self.errpath[:-4], casepath)
             self._tmpname += b'-%s' % casepath
         self._have = {}
 
     @property
     def refpath(self):
         return os.path.join(self._testdir, self.bname)
 
     def _run(self, env):
         with open(self.path, 'rb') as f:
             lines = f.readlines()
 
         # .t file is both reference output and the test input, keep reference
         # output updated with the the test input. This avoids some race
         # conditions where the reference output does not match the actual test.
         if self._refout is not None:
             self._refout = lines
 
         salt, script, after, expected = self._parsetest(lines)
 
         # Write out the generated script.
         fname = b'%s.sh' % self._testtmp
         with open(fname, 'wb') as f:
             for l in script:
                 f.write(l)
 
         cmd = b'%s "%s"' % (self._shell, fname)
         vlog("# Running", cmd)
 
         exitcode, output = self._runcommand(cmd, env)
 
         if self._aborted:
             raise KeyboardInterrupt()
 
         # Do not merge output if skipped. Return hghave message instead.
         # Similarly, with --debug, output is None.
         if exitcode == self.SKIPPED_STATUS or output is None:
             return exitcode, output
 
         return self._processoutput(exitcode, output, salt, after, expected)
 
     def _hghave(self, reqs):
         allreqs = b' '.join(reqs)
 
         self._detectslow(reqs)
 
         if allreqs in self._have:
             return self._have.get(allreqs)
 
         # TODO do something smarter when all other uses of hghave are gone.
         runtestdir = os.path.abspath(os.path.dirname(_bytespath(__file__)))
         tdir = runtestdir.replace(b'\\', b'/')
         proc = Popen4(b'%s -c "%s/hghave %s"' %
                       (self._shell, tdir, allreqs),
                       self._testtmp, 0, self._getenv())
         stdout, stderr = proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
         if ret == 2:
             print(stdout.decode('utf-8'))
             sys.exit(1)
 
         if ret != 0:
             self._have[allreqs] = (False, stdout)
             return False, stdout
 
         self._have[allreqs] = (True, None)
         return True, None
 
     def _detectslow(self, reqs):
         """update the timeout of slow test when appropriate"""
         if b'slow' in reqs:
             self._timeout = self._slowtimeout
 
     def _iftest(self, args):
         # implements "#if"
         reqs = []
         for arg in args:
             if arg.startswith(b'no-') and arg[3:] in self._allcases:
                 if arg[3:] in self._case:
                     return False
             elif arg in self._allcases:
                 if arg not in self._case:
                     return False
             else:
                 reqs.append(arg)
         self._detectslow(reqs)
         return self._hghave(reqs)[0]
 
     def _parsetest(self, lines):
         # We generate a shell script which outputs unique markers to line
         # up script results with our source. These markers include input
         # line number and the last return code.
         salt = b"SALT%d" % time.time()
         def addsalt(line, inpython):
             if inpython:
                 script.append(b'%s %d 0\n' % (salt, line))
             else:
                 script.append(b'echo %s %d $?\n' % (salt, line))
         activetrace = []
         session = str(uuid.uuid4())
         if PYTHON3:
             session = session.encode('ascii')
         hgcatapult = (os.getenv('HGTESTCATAPULTSERVERPIPE') or
                       os.getenv('HGCATAPULTSERVERPIPE'))
         def toggletrace(cmd=None):
             if not hgcatapult or hgcatapult == os.devnull:
                 return
 
             if activetrace:
                 script.append(
                     b'echo END %s %s >> "$HGTESTCATAPULTSERVERPIPE"\n' % (
                         session, activetrace[0]))
             if cmd is None:
                 return
 
             if isinstance(cmd, str):
                 quoted = shellquote(cmd.strip())
             else:
                 quoted = shellquote(cmd.strip().decode('utf8')).encode('utf8')
             quoted = quoted.replace(b'\\', b'\\\\')
             script.append(
                 b'echo START %s %s >> "$HGTESTCATAPULTSERVERPIPE"\n' % (
                     session, quoted))
             activetrace[0:] = [quoted]
 
         script = []
 
         # After we run the shell script, we re-unify the script output
         # with non-active parts of the source, with synchronization by our
         # SALT line number markers. The after table contains the non-active
         # components, ordered by line number.
         after = {}
 
         # Expected shell script output.
         expected = {}
 
         pos = prepos = -1
 
         # True or False when in a true or false conditional section
         skipping = None
 
         # We keep track of whether or not we're in a Python block so we
         # can generate the surrounding doctest magic.
         inpython = False
 
         if self._debug:
             script.append(b'set -x\n')
         if self._hgcommand != b'hg':
             script.append(b'alias hg="%s"\n' % self._hgcommand)
         if os.getenv('MSYSTEM'):
             script.append(b'alias pwd="pwd -W"\n')
 
         if hgcatapult and hgcatapult != os.devnull:
             # Kludge: use a while loop to keep the pipe from getting
             # closed by our echo commands. The still-running file gets
             # reaped at the end of the script, which causes the while
             # loop to exit and closes the pipe. Sigh.
             script.append(
                 b'rtendtracing() {\n'
                 b'  echo END %(session)s %(name)s >> %(catapult)s\n'
                 b'  rm -f "$TESTTMP/.still-running"\n'
                 b'}\n'
                 b'trap "rtendtracing" 0\n'
                 b'touch "$TESTTMP/.still-running"\n'
                 b'while [ -f "$TESTTMP/.still-running" ]; do sleep 1; done '
                 b'> %(catapult)s &\n'
                 b'HGCATAPULTSESSION=%(session)s ; export HGCATAPULTSESSION\n'
                 b'echo START %(session)s %(name)s >> %(catapult)s\n'
                 % {
                     'name': self.name,
                     'session': session,
                     'catapult': hgcatapult,
                 }
             )
 
         if self._case:
             casestr = b'#'.join(self._case)
             if isinstance(self._case, str):
                 quoted = shellquote(casestr)
             else:
                 quoted = shellquote(casestr.decode('utf8')).encode('utf8')
             script.append(b'TESTCASE=%s\n' % quoted)
             script.append(b'export TESTCASE\n')
 
         n = 0
         for n, l in enumerate(lines):
             if not l.endswith(b'\n'):
                 l += b'\n'
             if l.startswith(b'#require'):
                 lsplit = l.split()
                 if len(lsplit) < 2 or lsplit[0] != b'#require':
                     after.setdefault(pos, []).append('  !!! invalid #require\n')
                 if not skipping:
                     haveresult, message = self._hghave(lsplit[1:])
                     if not haveresult:
                         script = [b'echo "%s"\nexit 80\n' % message]
                         break
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#if'):
                 lsplit = l.split()
                 if len(lsplit) < 2 or lsplit[0] != b'#if':
                     after.setdefault(pos, []).append('  !!! invalid #if\n')
                 if skipping is not None:
                     after.setdefault(pos, []).append('  !!! nested #if\n')
                 skipping = not self._iftest(lsplit[1:])
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#else'):
                 if skipping is None:
                     after.setdefault(pos, []).append('  !!! missing #if\n')
                 skipping = not skipping
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#endif'):
                 if skipping is None:
                     after.setdefault(pos, []).append('  !!! missing #if\n')
                 skipping = None
                 after.setdefault(pos, []).append(l)
             elif skipping:
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'  >>> '): # python inlines
                 after.setdefault(pos, []).append(l)
                 prepos = pos
                 pos = n
                 if not inpython:
                     # We've just entered a Python block. Add the header.
                     inpython = True
                     addsalt(prepos, False) # Make sure we report the exit code.
                     script.append(b'"%s" -m heredoctest <<EOF\n' % PYTHON)
                 addsalt(n, True)
                 script.append(l[2:])
             elif l.startswith(b'  ... '): # python inlines
                 after.setdefault(prepos, []).append(l)
                 script.append(l[2:])
             elif l.startswith(b'  $ '): # commands
                 if inpython:
                     script.append(b'EOF\n')
                     inpython = False
                 after.setdefault(pos, []).append(l)
                 prepos = pos
                 pos = n
                 addsalt(n, False)
                 rawcmd = l[4:]
                 cmd = rawcmd.split()
                 toggletrace(rawcmd)
                 if len(cmd) == 2 and cmd[0] == b'cd':
                     l = b'  $ cd %s || exit 1\n' % cmd[1]
                 script.append(rawcmd)
             elif l.startswith(b'  > '): # continuations
                 after.setdefault(prepos, []).append(l)
                 script.append(l[4:])
             elif l.startswith(b'  '): # results
                 # Queue up a list of expected results.
                 expected.setdefault(pos, []).append(l[2:])
             else:
                 if inpython:
                     script.append(b'EOF\n')
                     inpython = False
                 # Non-command/result. Queue up for merged output.
                 after.setdefault(pos, []).append(l)
 
         if inpython:
             script.append(b'EOF\n')
         if skipping is not None:
             after.setdefault(pos, []).append('  !!! missing #endif\n')
         addsalt(n + 1, False)
         # Need to end any current per-command trace
         if activetrace:
             toggletrace()
         return salt, script, after, expected
 
     def _processoutput(self, exitcode, output, salt, after, expected):
         # Merge the script output back into a unified test.
         warnonly = 1 # 1: not yet; 2: yes; 3: for sure not
         if exitcode != 0:
             warnonly = 3
 
         pos = -1
         postout = []
         for l in output:
             lout, lcmd = l, None
             if salt in l:
                 lout, lcmd = l.split(salt, 1)
 
             while lout:
                 if not lout.endswith(b'\n'):
                     lout += b' (no-eol)\n'
 
                 # Find the expected output at the current position.
                 els = [None]
                 if expected.get(pos, None):
                     els = expected[pos]
 
                 optional = []
                 for i, el in enumerate(els):
                     r = False
                     if el:
                         r, exact = self.linematch(el, lout)
                     if isinstance(r, str):
                         if r == '-glob':
                             lout = ''.join(el.rsplit(' (glob)', 1))
                             r = '' # Warn only this line.
                         elif r == "retry":
                             postout.append(b'  ' + el)
                         else:
                             log('\ninfo, unknown linematch result: %r\n' % r)
                             r = False
                     if r:
                         els.pop(i)
                         break
                     if el:
                         if el.endswith(b" (?)\n"):
                             optional.append(i)
                         else:
                             m = optline.match(el)
                             if m:
                                 conditions = [
                                     c for c in m.group(2).split(b' ')]
 
                                 if not self._iftest(conditions):
                                     optional.append(i)
                         if exact:
                             # Don't allow line to be matches against a later
                             # line in the output
                             els.pop(i)
                             break
 
                 if r:
                     if r == "retry":
                         continue
                     # clean up any optional leftovers
                     for i in optional:
                         postout.append(b'  ' + els[i])
                     for i in reversed(optional):
                         del els[i]
                     postout.append(b'  ' + el)
                 else:
                     if self.NEEDESCAPE(lout):
                         lout = TTest._stringescape(b'%s (esc)\n' %
                                                    lout.rstrip(b'\n'))
                     postout.append(b'  ' + lout) # Let diff deal with it.
                     if r != '': # If line failed.
                         warnonly = 3 # for sure not
                     elif warnonly == 1: # Is "not yet" and line is warn only.
                         warnonly = 2 # Yes do warn.
                 break
             else:
                 # clean up any optional leftovers
                 while expected.get(pos, None):
                     el = expected[pos].pop(0)
                     if el:
                         if not el.endswith(b" (?)\n"):
                             m = optline.match(el)
                             if m:
                                 conditions = [c for c in m.group(2).split(b' ')]
 
                                 if self._iftest(conditions):
                                     # Don't append as optional line
                                     continue
                             else:
                                 continue
                     postout.append(b'  ' + el)
 
             if lcmd:
                 # Add on last return code.
                 ret = int(lcmd.split()[1])
                 if ret != 0:
                     postout.append(b'  [%d]\n' % ret)
                 if pos in after:
                     # Merge in non-active test bits.
                     postout += after.pop(pos)
                 pos = int(lcmd.split()[0])
 
         if pos in after:
             postout += after.pop(pos)
 
         if warnonly == 2:
             exitcode = False # Set exitcode to warned.
 
         return exitcode, postout
 
     @staticmethod
     def rematch(el, l):
         try:
             el = b'(?:' + el + b')'
             # use \Z to ensure that the regex matches to the end of the string
             if os.name == 'nt':
                 return re.match(el + br'\r?\n\Z', l)
             return re.match(el + br'\n\Z', l)
         except re.error:
             # el is an invalid regex
             return False
 
     @staticmethod
     def globmatch(el, l):
         # The only supported special characters are * and ? plus / which also
         # matches \ on windows. Escaping of these characters is supported.
         if el + b'\n' == l:
             if os.altsep:
                 # matching on "/" is not needed for this line
                 for pat in checkcodeglobpats:
                     if pat.match(el):
                         return True
                 return b'-glob'
             return True
         el = el.replace(b'$LOCALIP', b'*')
         i, n = 0, len(el)
         res = b''
         while i < n:
             c = el[i:i + 1]
             i += 1
             if c == b'\\' and i < n and el[i:i + 1] in b'*?\\/':
                 res += el[i - 1:i + 1]
                 i += 1
             elif c == b'*':
                 res += b'.*'
             elif c == b'?':
                 res += b'.'
             elif c == b'/' and os.altsep:
                 res += b'[/\\\\]'
             else:
                 res += re.escape(c)
         return TTest.rematch(res, l)
 
     def linematch(self, el, l):
         if el == l: # perfect match (fast)
             return True, True
         retry = False
         if el.endswith(b" (?)\n"):
             retry = "retry"
             el = el[:-5] + b"\n"
         else:
             m = optline.match(el)
             if m:
                 conditions = [c for c in m.group(2).split(b' ')]
 
                 el = m.group(1) + b"\n"
                 if not self._iftest(conditions):
                     # listed feature missing, should not match
                     return "retry", False
 
         if el.endswith(b" (esc)\n"):
             if PYTHON3:
                 el = el[:-7].decode('unicode_escape') + '\n'
                 el = el.encode('utf-8')
             else:
                 el = el[:-7].decode('string-escape') + '\n'
         if el == l or os.name == 'nt' and el[:-1] + b'\r\n' == l:
             return True, True
         if el.endswith(b" (re)\n"):
             return (TTest.rematch(el[:-6], l) or retry), False
         if el.endswith(b" (glob)\n"):
             # ignore '(glob)' added to l by 'replacements'
             if l.endswith(b" (glob)\n"):
                 l = l[:-8] + b"\n"
             return (TTest.globmatch(el[:-8], l) or retry), False
         if os.altsep:
             _l = l.replace(b'\\', b'/')
             if el == _l or os.name == 'nt' and el[:-1] + b'\r\n' == _l:
                 return True, True
         return retry, True
 
     @staticmethod
     def parsehghaveoutput(lines):
         '''Parse hghave log lines.
 
         Return tuple of lists (missing, failed):
           * the missing/unknown features
           * the features for which existence check failed'''
         missing = []
         failed = []
         for line in lines:
             if line.startswith(TTest.SKIPPED_PREFIX):
                 line = line.splitlines()[0]
                 missing.append(line[len(TTest.SKIPPED_PREFIX):].decode('utf-8'))
             elif line.startswith(TTest.FAILED_PREFIX):
                 line = line.splitlines()[0]
                 failed.append(line[len(TTest.FAILED_PREFIX):].decode('utf-8'))
 
         return missing, failed
 
     @staticmethod
     def _escapef(m):
         return TTest.ESCAPEMAP[m.group(0)]
 
     @staticmethod
     def _stringescape(s):
         return TTest.ESCAPESUB(TTest._escapef, s)
 
 iolock = threading.RLock()
 firstlock = threading.RLock()
 firsterror = False
 
 class TestResult(unittest._TextTestResult):
     """Holds results when executing via unittest."""
     # Don't worry too much about accessing the non-public _TextTestResult.
     # It is relatively common in Python testing tools.
     def __init__(self, options, *args, **kwargs):
         super(TestResult, self).__init__(*args, **kwargs)
 
         self._options = options
 
         # unittest.TestResult didn't have skipped until 2.7. We need to
         # polyfill it.
         self.skipped = []
 
         # We have a custom "ignored" result that isn't present in any Python
         # unittest implementation. It is very similar to skipped. It may make
         # sense to map it into skip some day.
         self.ignored = []
 
         self.times = []
         self._firststarttime = None
         # Data stored for the benefit of generating xunit reports.
         self.successes = []
         self.faildata = {}
 
         if options.color == 'auto':
             self.color = pygmentspresent and self.stream.isatty()
         elif options.color == 'never':
             self.color = False
         else: # 'always', for testing purposes
             self.color = pygmentspresent
 
     def onStart(self, test):
         """ Can be overriden by custom TestResult
         """
 
     def onEnd(self):
         """ Can be overriden by custom TestResult
         """
 
     def addFailure(self, test, reason):
         self.failures.append((test, reason))
 
         if self._options.first:
             self.stop()
         else:
             with iolock:
                 if reason == "timed out":
                     self.stream.write('t')
                 else:
                     if not self._options.nodiff:
                         self.stream.write('\n')
                         # Exclude the '\n' from highlighting to lex correctly
                         formatted = 'ERROR: %s output changed\n' % test
                         self.stream.write(highlightmsg(formatted, self.color))
                     self.stream.write('!')
 
                 self.stream.flush()
 
     def addSuccess(self, test):
         with iolock:
             super(TestResult, self).addSuccess(test)
         self.successes.append(test)
 
     def addError(self, test, err):
         super(TestResult, self).addError(test, err)
         if self._options.first:
             self.stop()
 
     # Polyfill.
     def addSkip(self, test, reason):
         self.skipped.append((test, reason))
         with iolock:
             if self.showAll:
                 self.stream.writeln('skipped %s' % reason)
             else:
                 self.stream.write('s')
                 self.stream.flush()
 
     def addIgnore(self, test, reason):
         self.ignored.append((test, reason))
         with iolock:
             if self.showAll:
                 self.stream.writeln('ignored %s' % reason)
             else:
                 if reason not in ('not retesting', "doesn't match keyword"):
                     self.stream.write('i')
                 else:
                     self.testsRun += 1
                 self.stream.flush()
 
     def addOutputMismatch(self, test, ret, got, expected):
         """Record a mismatch in test output for a particular test."""
         if self.shouldStop or firsterror:
             # don't print, some other test case already failed and
             # printed, we're just stale and probably failed due to our
             # temp dir getting cleaned up.
             return
 
         accepted = False
         lines = []
 
         with iolock:
             if self._options.nodiff:
                 pass
             elif self._options.view:
                 v = self._options.view
                 subprocess.call(r'"%s" "%s" "%s"' %
                                 (v, _strpath(test.refpath),
                                  _strpath(test.errpath)), shell=True)
             else:
                 servefail, lines = getdiff(expected, got,
                                            test.refpath, test.errpath)
                 self.stream.write('\n')
                 for line in lines:
                     line = highlightdiff(line, self.color)
                     if PYTHON3:
                         self.stream.flush()
                         self.stream.buffer.write(line)
                         self.stream.buffer.flush()
                     else:
                         self.stream.write(line)
                         self.stream.flush()
 
                 if servefail:
                     raise test.failureException(
                         'server failed to start (HGPORT=%s)' % test._startport)
 
             # handle interactive prompt without releasing iolock
             if self._options.interactive:
                 if test.readrefout() != expected:
                     self.stream.write(
                         'Reference output has changed (run again to prompt '
                         'changes)')
                 else:
                     self.stream.write('Accept this change? [n] ')
                     self.stream.flush()
                     answer = sys.stdin.readline().strip()
                     if answer.lower() in ('y', 'yes'):
                         if test.path.endswith(b'.t'):
                             rename(test.errpath, test.path)
                         else:
                             rename(test.errpath, '%s.out' % test.path)
                         accepted = True
             if not accepted:
                 self.faildata[test.name] = b''.join(lines)
 
         return accepted
 
     def startTest(self, test):
         super(TestResult, self).startTest(test)
 
         # os.times module computes the user time and system time spent by
         # child's processes along with real elapsed time taken by a process.
         # This module has one limitation. It can only work for Linux user
         # and not for Windows.
         test.started = os.times()
         if self._firststarttime is None: # thread racy but irrelevant
             self._firststarttime = test.started[4]
 
     def stopTest(self, test, interrupted=False):
         super(TestResult, self).stopTest(test)
 
         test.stopped = os.times()
 
         starttime = test.started
         endtime = test.stopped
         origin = self._firststarttime
         self.times.append((test.name,
                            endtime[2] - starttime[2], # user space CPU time
                            endtime[3] - starttime[3], # sys  space CPU time
                            endtime[4] - starttime[4], # real time
                            starttime[4] - origin, # start date in run context
                            endtime[4] - origin, # end date in run context
                            ))
 
         if interrupted:
             with iolock:
                 self.stream.writeln('INTERRUPTED: %s (after %d seconds)' % (
                     test.name, self.times[-1][3]))
 
 def getTestResult():
     """
     Returns the relevant test result
     """
     if "CUSTOM_TEST_RESULT" in os.environ:
         testresultmodule = __import__(os.environ["CUSTOM_TEST_RESULT"])
         return testresultmodule.TestResult
     else:
         return TestResult
 
 class TestSuite(unittest.TestSuite):
     """Custom unittest TestSuite that knows how to execute Mercurial tests."""
 
     def __init__(self, testdir, jobs=1, whitelist=None, blacklist=None,
                  retest=False, keywords=None, loop=False, runs_per_test=1,
                  loadtest=None, showchannels=False,
                  *args, **kwargs):
         """Create a new instance that can run tests with a configuration.
 
         testdir specifies the directory where tests are executed from. This
         is typically the ``tests`` directory from Mercurial's source
         repository.
 
         jobs specifies the number of jobs to run concurrently. Each test
         executes on its own thread. Tests actually spawn new processes, so
         state mutation should not be an issue.
 
         If there is only one job, it will use the main thread.
 
         whitelist and blacklist denote tests that have been whitelisted and
         blacklisted, respectively. These arguments don't belong in TestSuite.
         Instead, whitelist and blacklist should be handled by the thing that
         populates the TestSuite with tests. They are present to preserve
         backwards compatible behavior which reports skipped tests as part
         of the results.
 
         retest denotes whether to retest failed tests. This arguably belongs
         outside of TestSuite.
 
         keywords denotes key words that will be used to filter which tests
         to execute. This arguably belongs outside of TestSuite.
 
         loop denotes whether to loop over tests forever.
         """
         super(TestSuite, self).__init__(*args, **kwargs)
 
         self._jobs = jobs
         self._whitelist = whitelist
         self._blacklist = blacklist
         self._retest = retest
         self._keywords = keywords
         self._loop = loop
         self._runs_per_test = runs_per_test
         self._loadtest = loadtest
         self._showchannels = showchannels
 
     def run(self, result):
         # We have a number of filters that need to be applied. We do this
         # here instead of inside Test because it makes the running logic for
         # Test simpler.
         tests = []
         num_tests = [0]
         for test in self._tests:
             def get():
                 num_tests[0] += 1
                 if getattr(test, 'should_reload', False):
                     return self._loadtest(test, num_tests[0])
                 return test
             if not os.path.exists(test.path):
                 result.addSkip(test, "Doesn't exist")
                 continue
 
             if not (self._whitelist and test.bname in self._whitelist):
                 if self._blacklist and test.bname in self._blacklist:
                     result.addSkip(test, 'blacklisted')
                     continue
 
                 if self._retest and not os.path.exists(test.errpath):
                     result.addIgnore(test, 'not retesting')
                     continue
 
                 if self._keywords:
                     with open(test.path, 'rb') as f:
                         t = f.read().lower() + test.bname.lower()
                     ignored = False
                     for k in self._keywords.lower().split():
                         if k not in t:
                             result.addIgnore(test, "doesn't match keyword")
                             ignored = True
                             break
 
                     if ignored:
                         continue
             for _ in xrange(self._runs_per_test):
                 tests.append(get())
 
         runtests = list(tests)
         done = queue.Queue()
         running = 0
 
         channels = [""] * self._jobs
 
         def job(test, result):
             for n, v in enumerate(channels):
                 if not v:
                     channel = n
                     break
             else:
                 raise ValueError('Could not find output channel')
             channels[channel] = "=" + test.name[5:].split(".")[0]
             try:
                 test(result)
                 done.put(None)
             except KeyboardInterrupt:
                 pass
             except: # re-raises
                 done.put(('!', test, 'run-test raised an error, see traceback'))
                 raise
             finally:
                 try:
                     channels[channel] = ''
                 except IndexError:
                     pass
 
         def stat():
             count = 0
             while channels:
                 d = '\n%03s  ' % count
                 for n, v in enumerate(channels):
                     if v:
                         d += v[0]
                         channels[n] = v[1:] or '.'
                     else:
                         d += ' '
                     d += ' '
                 with iolock:
                     sys.stdout.write(d + '  ')
                     sys.stdout.flush()
                 for x in xrange(10):
                     if channels:
                         time.sleep(.1)
                 count += 1
 
         stoppedearly = False
 
         if self._showchannels:
             statthread = threading.Thread(target=stat, name="stat")
             statthread.start()
 
         try:
             while tests or running:
                 if not done.empty() or running == self._jobs or not tests:
                     try:
                         done.get(True, 1)
                         running -= 1
                         if result and result.shouldStop:
                             stoppedearly = True
                             break
                     except queue.Empty:
                         continue
                 if tests and not running == self._jobs:
                     test = tests.pop(0)
                     if self._loop:
                         if getattr(test, 'should_reload', False):
                             num_tests[0] += 1
                             tests.append(
                                 self._loadtest(test, num_tests[0]))
                         else:
                             tests.append(test)
                     if self._jobs == 1:
                         job(test, result)
                     else:
                         t = threading.Thread(target=job, name=test.name,
                                              args=(test, result))
                         t.start()
                     running += 1
 
             # If we stop early we still need to wait on started tests to
             # finish. Otherwise, there is a race between the test completing
             # and the test's cleanup code running. This could result in the
             # test reporting incorrect.
             if stoppedearly:
                 while running:
                     try:
                         done.get(True, 1)
                         running -= 1
                     except queue.Empty:
                         continue
         except KeyboardInterrupt:
             for test in runtests:
                 test.abort()
 
         channels = []
 
         return result
 
 # Save the most recent 5 wall-clock runtimes of each test to a
 # human-readable text file named .testtimes. Tests are sorted
 # alphabetically, while times for each test are listed from oldest to
 # newest.
 
 def loadtimes(outputdir):
     times = []
     try:
         with open(os.path.join(outputdir, b'.testtimes')) as fp:
             for line in fp:
                 m = re.match('(.*?) ([0-9. ]+)', line)
                 times.append((m.group(1),
                               [float(t) for t in m.group(2).split()]))
     except IOError as err:
         if err.errno != errno.ENOENT:
             raise
     return times
 
 def savetimes(outputdir, result):
     saved = dict(loadtimes(outputdir))
     maxruns = 5
     skipped = set([str(t[0]) for t in result.skipped])
     for tdata in result.times:
         test, real = tdata[0], tdata[3]
         if test not in skipped:
             ts = saved.setdefault(test, [])
             ts.append(real)
             ts[:] = ts[-maxruns:]
 
     fd, tmpname = tempfile.mkstemp(prefix=b'.testtimes',
                                    dir=outputdir, text=True)
     with os.fdopen(fd, 'w') as fp:
         for name, ts in sorted(saved.items()):
             fp.write('%s %s\n' % (name, ' '.join(['%.3f' % (t,) for t in ts])))
     timepath = os.path.join(outputdir, b'.testtimes')
     try:
         os.unlink(timepath)
     except OSError:
         pass
     try:
         os.rename(tmpname, timepath)
     except OSError:
         pass
 
 class TextTestRunner(unittest.TextTestRunner):
     """Custom unittest test runner that uses appropriate settings."""
 
     def __init__(self, runner, *args, **kwargs):
         super(TextTestRunner, self).__init__(*args, **kwargs)
 
         self._runner = runner
 
         self._result = getTestResult()(self._runner.options, self.stream,
                                        self.descriptions, self.verbosity)
 
     def listtests(self, test):
         test = sorted(test, key=lambda t: t.name)
 
         self._result.onStart(test)
 
         for t in test:
             print(t.name)
             self._result.addSuccess(t)
 
         if self._runner.options.xunit:
             with open(self._runner.options.xunit, "wb") as xuf:
                 self._writexunit(self._result, xuf)
 
         if self._runner.options.json:
             jsonpath = os.path.join(self._runner._outputdir, b'report.json')
             with open(jsonpath, 'w') as fp:
                 self._writejson(self._result, fp)
 
         return self._result
 
     def run(self, test):
         self._result.onStart(test)
         test(self._result)
 
         failed = len(self._result.failures)
         skipped = len(self._result.skipped)
         ignored = len(self._result.ignored)
 
         with iolock:
             self.stream.writeln('')
 
             if not self._runner.options.noskips:
                 for test, msg in sorted(self._result.skipped,
                                         key=lambda s: s[0].name):
                     formatted = 'Skipped %s: %s\n' % (test.name, msg)
                     msg = highlightmsg(formatted, self._result.color)
                     self.stream.write(msg)
             for test, msg in sorted(self._result.failures,
                                     key=lambda f: f[0].name):
                 formatted = 'Failed %s: %s\n' % (test.name, msg)
                 self.stream.write(highlightmsg(formatted, self._result.color))
             for test, msg in sorted(self._result.errors,
                                     key=lambda e: e[0].name):
                 self.stream.writeln('Errored %s: %s' % (test.name, msg))
 
             if self._runner.options.xunit:
                 with open(self._runner.options.xunit, "wb") as xuf:
                     self._writexunit(self._result, xuf)
 
             if self._runner.options.json:
                 jsonpath = os.path.join(self._runner._outputdir, b'report.json')
                 with open(jsonpath, 'w') as fp:
                     self._writejson(self._result, fp)
 
             self._runner._checkhglib('Tested')
 
             savetimes(self._runner._outputdir, self._result)
 
             if failed and self._runner.options.known_good_rev:
                 self._bisecttests(t for t, m in self._result.failures)
             self.stream.writeln(
                 '# Ran %d tests, %d skipped, %d failed.'
                 % (self._result.testsRun, skipped + ignored, failed))
             if failed:
                 self.stream.writeln('python hash seed: %s' %
                     os.environ['PYTHONHASHSEED'])
             if self._runner.options.time:
                 self.printtimes(self._result.times)
 
             if self._runner.options.exceptions:
                 exceptions = aggregateexceptions(
                     os.path.join(self._runner._outputdir, b'exceptions'))
 
                 self.stream.writeln('Exceptions Report:')
                 self.stream.writeln('%d total from %d frames' %
                                     (exceptions['total'],
                                      len(exceptions['exceptioncounts'])))
                 combined = exceptions['combined']
                 for key in sorted(combined, key=combined.get, reverse=True):
                     frame, line, exc = key
                     totalcount, testcount, leastcount, leasttest = combined[key]
 
                     self.stream.writeln('%d (%d tests)\t%s: %s (%s - %d total)'
                                         % (totalcount,
                                            testcount,
                                            frame, exc,
                                            leasttest, leastcount))
 
             self.stream.flush()
 
         return self._result
 
     def _bisecttests(self, tests):
         bisectcmd = ['hg', 'bisect']
         bisectrepo = self._runner.options.bisect_repo
         if bisectrepo:
             bisectcmd.extend(['-R', os.path.abspath(bisectrepo)])
         def pread(args):
             env = os.environ.copy()
             env['HGPLAIN'] = '1'
             p = subprocess.Popen(args, stderr=subprocess.STDOUT,
                                  stdout=subprocess.PIPE, env=env)
             data = p.stdout.read()
             p.wait()
             return data
         for test in tests:
             pread(bisectcmd + ['--reset']),
             pread(bisectcmd + ['--bad', '.'])
             pread(bisectcmd + ['--good', self._runner.options.known_good_rev])
             # TODO: we probably need to forward more options
             # that alter hg's behavior inside the tests.
             opts = ''
             withhg = self._runner.options.with_hg
             if withhg:
                 opts += ' --with-hg=%s ' % shellquote(_strpath(withhg))
-            rtc = '%s %s %s %s' % (sys.executable, sys.argv[0], opts,
+            rtc = '%s %s %s %s' % (sysexecutable, sys.argv[0], opts,
                                    test)
             data = pread(bisectcmd + ['--command', rtc])
             m = re.search(
                 (br'\nThe first (?P<goodbad>bad|good) revision '
                  br'is:\nchangeset: +\d+:(?P<node>[a-f0-9]+)\n.*\n'
                  br'summary: +(?P<summary>[^\n]+)\n'),
                 data, (re.MULTILINE | re.DOTALL))
             if m is None:
                 self.stream.writeln(
                     'Failed to identify failure point for %s' % test)
                 continue
             dat = m.groupdict()
             verb = 'broken' if dat['goodbad'] == b'bad' else 'fixed'
             self.stream.writeln(
                 '%s %s by %s (%s)' % (
                     test, verb, dat['node'].decode('ascii'),
                     dat['summary'].decode('utf8', 'ignore')))
 
     def printtimes(self, times):
         # iolock held by run
         self.stream.writeln('# Producing time report')
         times.sort(key=lambda t: (t[3]))
         cols = '%7.3f %7.3f %7.3f %7.3f %7.3f   %s'
         self.stream.writeln('%-7s %-7s %-7s %-7s %-7s   %s' %
                             ('start', 'end', 'cuser', 'csys', 'real', 'Test'))
         for tdata in times:
             test = tdata[0]
             cuser, csys, real, start, end = tdata[1:6]
             self.stream.writeln(cols % (start, end, cuser, csys, real, test))
 
     @staticmethod
     def _writexunit(result, outf):
         # See http://llg.cubic.org/docs/junit/ for a reference.
         timesd = dict((t[0], t[3]) for t in result.times)
         doc = minidom.Document()
         s = doc.createElement('testsuite')
         s.setAttribute('errors', "0") # TODO
         s.setAttribute('failures', str(len(result.failures)))
         s.setAttribute('name', 'run-tests')
         s.setAttribute('skipped', str(len(result.skipped) +
                                       len(result.ignored)))
         s.setAttribute('tests', str(result.testsRun))
         doc.appendChild(s)
         for tc in result.successes:
             t = doc.createElement('testcase')
             t.setAttribute('name', tc.name)
             tctime = timesd.get(tc.name)
             if tctime is not None:
                 t.setAttribute('time', '%.3f' % tctime)
             s.appendChild(t)
         for tc, err in sorted(result.faildata.items()):
             t = doc.createElement('testcase')
             t.setAttribute('name', tc)
             tctime = timesd.get(tc)
             if tctime is not None:
                 t.setAttribute('time', '%.3f' % tctime)
             # createCDATASection expects a unicode or it will
             # convert using default conversion rules, which will
             # fail if string isn't ASCII.
             err = cdatasafe(err).decode('utf-8', 'replace')
             cd = doc.createCDATASection(err)
             # Use 'failure' here instead of 'error' to match errors = 0,
             # failures = len(result.failures) in the testsuite element.
             failelem = doc.createElement('failure')
             failelem.setAttribute('message', 'output changed')
             failelem.setAttribute('type', 'output-mismatch')
             failelem.appendChild(cd)
             t.appendChild(failelem)
             s.appendChild(t)
         for tc, message in result.skipped:
             # According to the schema, 'skipped' has no attributes. So store
             # the skip message as a text node instead.
             t = doc.createElement('testcase')
             t.setAttribute('name', tc.name)
             binmessage = message.encode('utf-8')
             message = cdatasafe(binmessage).decode('utf-8', 'replace')
             cd = doc.createCDATASection(message)
             skipelem = doc.createElement('skipped')
             skipelem.appendChild(cd)
             t.appendChild(skipelem)
             s.appendChild(t)
         outf.write(doc.toprettyxml(indent='  ', encoding='utf-8'))
 
     @staticmethod
     def _writejson(result, outf):
         timesd = {}
         for tdata in result.times:
             test = tdata[0]
             timesd[test] = tdata[1:]
 
         outcome = {}
         groups = [('success', ((tc, None)
                    for tc in result.successes)),
                   ('failure', result.failures),
                   ('skip', result.skipped)]
         for res, testcases in groups:
             for tc, __ in testcases:
                 if tc.name in timesd:
                     diff = result.faildata.get(tc.name, b'')
                     try:
                         diff = diff.decode('unicode_escape')
                     except UnicodeDecodeError as e:
                         diff = '%r decoding diff, sorry' % e
                     tres = {'result': res,
                             'time': ('%0.3f' % timesd[tc.name][2]),
                             'cuser': ('%0.3f' % timesd[tc.name][0]),
                             'csys': ('%0.3f' % timesd[tc.name][1]),
                             'start': ('%0.3f' % timesd[tc.name][3]),
                             'end': ('%0.3f' % timesd[tc.name][4]),
                             'diff': diff,
                             }
                 else:
                     # blacklisted test
                     tres = {'result': res}
 
                 outcome[tc.name] = tres
         jsonout = json.dumps(outcome, sort_keys=True, indent=4,
                              separators=(',', ': '))
         outf.writelines(("testreport =", jsonout))
 
 def sorttests(testdescs, previoustimes, shuffle=False):
     """Do an in-place sort of tests."""
     if shuffle:
         random.shuffle(testdescs)
         return
 
     if previoustimes:
         def sortkey(f):
             f = f['path']
             if f in previoustimes:
                 # Use most recent time as estimate
                 return -previoustimes[f][-1]
             else:
                 # Default to a rather arbitrary value of 1 second for new tests
                 return -1.0
     else:
         # keywords for slow tests
         slow = {b'svn': 10,
                 b'cvs': 10,
                 b'hghave': 10,
                 b'largefiles-update': 10,
                 b'run-tests': 10,
                 b'corruption': 10,
                 b'race': 10,
                 b'i18n': 10,
                 b'check': 100,
                 b'gendoc': 100,
                 b'contrib-perf': 200,
                 }
         perf = {}
 
         def sortkey(f):
             # run largest tests first, as they tend to take the longest
             f = f['path']
             try:
                 return perf[f]
             except KeyError:
                 try:
                     val = -os.stat(f).st_size
                 except OSError as e:
                     if e.errno != errno.ENOENT:
                         raise
                     perf[f] = -1e9  # file does not exist, tell early
                     return -1e9
                 for kw, mul in slow.items():
                     if kw in f:
                         val *= mul
                 if f.endswith(b'.py'):
                     val /= 10.0
                 perf[f] = val / 1000.0
                 return perf[f]
 
     testdescs.sort(key=sortkey)
 
 class TestRunner(object):
     """Holds context for executing tests.
 
     Tests rely on a lot of state. This object holds it for them.
     """
 
     # Programs required to run tests.
     REQUIREDTOOLS = [
         b'diff',
         b'grep',
         b'unzip',
         b'gunzip',
         b'bunzip2',
         b'sed',
     ]
 
     # Maps file extensions to test class.
     TESTTYPES = [
         (b'.py', PythonTest),
         (b'.t', TTest),
     ]
 
     def __init__(self):
         self.options = None
         self._hgroot = None
         self._testdir = None
         self._outputdir = None
         self._hgtmp = None
         self._installdir = None
         self._bindir = None
         self._tmpbinddir = None
         self._pythondir = None
         self._coveragefile = None
         self._createdfiles = []
         self._hgcommand = None
         self._hgpath = None
         self._portoffset = 0
         self._ports = {}
 
     def run(self, args, parser=None):
         """Run the test suite."""
         oldmask = os.umask(0o22)
         try:
             parser = parser or getparser()
             options = parseargs(args, parser)
             tests = [_bytespath(a) for a in options.tests]
             if options.test_list is not None:
                 for listfile in options.test_list:
                     with open(listfile, 'rb') as f:
                         tests.extend(t for t in f.read().splitlines() if t)
             self.options = options
 
             self._checktools()
             testdescs = self.findtests(tests)
             if options.profile_runner:
                 import statprof
                 statprof.start()
             result = self._run(testdescs)
             if options.profile_runner:
                 statprof.stop()
                 statprof.display()
             return result
 
         finally:
             os.umask(oldmask)
 
     def _run(self, testdescs):
         testdir = getcwdb()
         self._testdir = osenvironb[b'TESTDIR'] = getcwdb()
         # assume all tests in same folder for now
         if testdescs:
             pathname = os.path.dirname(testdescs[0]['path'])
             if pathname:
                 testdir = os.path.join(testdir, pathname)
         self._testdir = osenvironb[b'TESTDIR'] = testdir
         if self.options.outputdir:
             self._outputdir = canonpath(_bytespath(self.options.outputdir))
         else:
             self._outputdir = getcwdb()
             if testdescs and pathname:
                 self._outputdir = os.path.join(self._outputdir, pathname)
         previoustimes = {}
         if self.options.order_by_runtime:
             previoustimes = dict(loadtimes(self._outputdir))
         sorttests(testdescs, previoustimes, shuffle=self.options.random)
 
         if 'PYTHONHASHSEED' not in os.environ:
             # use a random python hash seed all the time
             # we do the randomness ourself to know what seed is used
             os.environ['PYTHONHASHSEED'] = str(random.getrandbits(32))
 
         if self.options.tmpdir:
             self.options.keep_tmpdir = True
             tmpdir = _bytespath(self.options.tmpdir)
             if os.path.exists(tmpdir):
                 # Meaning of tmpdir has changed since 1.3: we used to create
                 # HGTMP inside tmpdir; now HGTMP is tmpdir.  So fail if
                 # tmpdir already exists.
                 print("error: temp dir %r already exists" % tmpdir)
                 return 1
 
             os.makedirs(tmpdir)
         else:
             d = None
             if os.name == 'nt':
                 # without this, we get the default temp dir location, but
                 # in all lowercase, which causes troubles with paths (issue3490)
                 d = osenvironb.get(b'TMP', None)
             tmpdir = tempfile.mkdtemp(b'', b'hgtests.', d)
 
         self._hgtmp = osenvironb[b'HGTMP'] = (
             os.path.realpath(tmpdir))
 
         if self.options.with_hg:
             self._installdir = None
             whg = self.options.with_hg
             self._bindir = os.path.dirname(os.path.realpath(whg))
             assert isinstance(self._bindir, bytes)
             self._hgcommand = os.path.basename(whg)
             self._tmpbindir = os.path.join(self._hgtmp, b'install', b'bin')
             os.makedirs(self._tmpbindir)
 
             normbin = os.path.normpath(os.path.abspath(whg))
             normbin = normbin.replace(os.sep.encode('ascii'), b'/')
 
             # Other Python scripts in the test harness need to
             # `import mercurial`. If `hg` is a Python script, we assume
             # the Mercurial modules are relative to its path and tell the tests
             # to load Python modules from its directory.
             with open(whg, 'rb') as fh:
                 initial = fh.read(1024)
 
             if re.match(b'#!.*python', initial):
                 self._pythondir = self._bindir
             # If it looks like our in-repo Rust binary, use the source root.
             # This is a bit hacky. But rhg is still not supported outside the
             # source directory. So until it is, do the simple thing.
             elif re.search(b'/rust/target/[^/]+/hg', normbin):
                 self._pythondir = os.path.dirname(self._testdir)
             # Fall back to the legacy behavior.
             else:
                 self._pythondir = self._bindir
 
         else:
             self._installdir = os.path.join(self._hgtmp, b"install")
             self._bindir = os.path.join(self._installdir, b"bin")
             self._hgcommand = b'hg'
             self._tmpbindir = self._bindir
             self._pythondir = os.path.join(self._installdir, b"lib", b"python")
 
         # Force the use of hg.exe instead of relying on MSYS to recognize hg is
         # a python script and feed it to python.exe.  Legacy stdio is force
         # enabled by hg.exe, and this is a more realistic way to launch hg
         # anyway.
         if os.name == 'nt' and not self._hgcommand.endswith(b'.exe'):
             self._hgcommand += b'.exe'
 
         # set CHGHG, then replace "hg" command by "chg"
         chgbindir = self._bindir
         if self.options.chg or self.options.with_chg:
             osenvironb[b'CHGHG'] = os.path.join(self._bindir, self._hgcommand)
         else:
             osenvironb.pop(b'CHGHG', None)  # drop flag for hghave
         if self.options.chg:
             self._hgcommand = b'chg'
         elif self.options.with_chg:
             chgbindir = os.path.dirname(os.path.realpath(self.options.with_chg))
             self._hgcommand = os.path.basename(self.options.with_chg)
 
         osenvironb[b"BINDIR"] = self._bindir
         osenvironb[b"PYTHON"] = PYTHON
 
         fileb = _bytespath(__file__)
         runtestdir = os.path.abspath(os.path.dirname(fileb))
         osenvironb[b'RUNTESTDIR'] = runtestdir
         if PYTHON3:
             sepb = _bytespath(os.pathsep)
         else:
             sepb = os.pathsep
         path = [self._bindir, runtestdir] + osenvironb[b"PATH"].split(sepb)
         if os.path.islink(__file__):
             # test helper will likely be at the end of the symlink
             realfile = os.path.realpath(fileb)
             realdir = os.path.abspath(os.path.dirname(realfile))
             path.insert(2, realdir)
         if chgbindir != self._bindir:
             path.insert(1, chgbindir)
         if self._testdir != runtestdir:
             path = [self._testdir] + path
         if self._tmpbindir != self._bindir:
             path = [self._tmpbindir] + path
         osenvironb[b"PATH"] = sepb.join(path)
 
         # Include TESTDIR in PYTHONPATH so that out-of-tree extensions
         # can run .../tests/run-tests.py test-foo where test-foo
         # adds an extension to HGRC. Also include run-test.py directory to
         # import modules like heredoctest.
         pypath = [self._pythondir, self._testdir, runtestdir]
         # We have to augment PYTHONPATH, rather than simply replacing
         # it, in case external libraries are only available via current
         # PYTHONPATH.  (In particular, the Subversion bindings on OS X
         # are in /opt/subversion.)
         oldpypath = osenvironb.get(IMPL_PATH)
         if oldpypath:
             pypath.append(oldpypath)
         osenvironb[IMPL_PATH] = sepb.join(pypath)
 
         if self.options.pure:
             os.environ["HGTEST_RUN_TESTS_PURE"] = "--pure"
             os.environ["HGMODULEPOLICY"] = "py"
 
         if self.options.allow_slow_tests:
             os.environ["HGTEST_SLOW"] = "slow"
         elif 'HGTEST_SLOW' in os.environ:
             del os.environ['HGTEST_SLOW']
 
         self._coveragefile = os.path.join(self._testdir, b'.coverage')
 
         if self.options.exceptions:
             exceptionsdir = os.path.join(self._outputdir, b'exceptions')
             try:
                 os.makedirs(exceptionsdir)
             except OSError as e:
                 if e.errno != errno.EEXIST:
                     raise
 
             # Remove all existing exception reports.
             for f in os.listdir(exceptionsdir):
                 os.unlink(os.path.join(exceptionsdir, f))
 
             osenvironb[b'HGEXCEPTIONSDIR'] = exceptionsdir
             logexceptions = os.path.join(self._testdir, b'logexceptions.py')
             self.options.extra_config_opt.append(
                 'extensions.logexceptions=%s' % logexceptions.decode('utf-8'))
 
         vlog("# Using TESTDIR", self._testdir)
         vlog("# Using RUNTESTDIR", osenvironb[b'RUNTESTDIR'])
         vlog("# Using HGTMP", self._hgtmp)
         vlog("# Using PATH", os.environ["PATH"])
         vlog("# Using", IMPL_PATH, osenvironb[IMPL_PATH])
         vlog("# Writing to directory", self._outputdir)
 
         try:
             return self._runtests(testdescs) or 0
         finally:
             time.sleep(.1)
             self._cleanup()
 
     def findtests(self, args):
         """Finds possible test files from arguments.
 
         If you wish to inject custom tests into the test harness, this would
         be a good function to monkeypatch or override in a derived class.
         """
         if not args:
             if self.options.changed:
                 proc = Popen4(b'hg st --rev "%s" -man0 .' %
                               _bytespath(self.options.changed), None, 0)
                 stdout, stderr = proc.communicate()
                 args = stdout.strip(b'\0').split(b'\0')
             else:
                 args = os.listdir(b'.')
 
         expanded_args = []
         for arg in args:
             if os.path.isdir(arg):
                 if not arg.endswith(b'/'):
                     arg += b'/'
                 expanded_args.extend([arg + a for a in os.listdir(arg)])
             else:
                 expanded_args.append(arg)
         args = expanded_args
 
         testcasepattern = re.compile(
             br'([\w-]+\.t|py)(?:#([a-zA-Z0-9_\-\.#]+))')
         tests = []
         for t in args:
             case = []
 
             if not (os.path.basename(t).startswith(b'test-')
                     and (t.endswith(b'.py') or t.endswith(b'.t'))):
 
                 m = testcasepattern.match(os.path.basename(t))
                 if m is not None:
                     t_basename, casestr = m.groups()
                     t = os.path.join(os.path.dirname(t), t_basename)
                     if casestr:
                         case = casestr.split(b'#')
                 else:
                     continue
 
             if t.endswith(b'.t'):
                 # .t file may contain multiple test cases
                 casedimensions = parsettestcases(t)
                 if casedimensions:
                     cases = []
                     def addcases(case, casedimensions):
                         if not casedimensions:
                             cases.append(case)
                         else:
                             for c in casedimensions[0]:
                                 addcases(case + [c], casedimensions[1:])
                     addcases([], casedimensions)
                     if case and case in cases:
                         cases = [case]
                     elif case:
                         # Ignore invalid cases
                         cases = []
                     else:
                         pass
                     tests += [{'path': t, 'case': c} for c in sorted(cases)]
                 else:
                     tests.append({'path': t})
             else:
                 tests.append({'path': t})
         return tests
 
     def _runtests(self, testdescs):
         def _reloadtest(test, i):
             # convert a test back to its description dict
             desc = {'path': test.path}
             case = getattr(test, '_case', [])
             if case:
                 desc['case'] = case
             return self._gettest(desc, i)
 
         try:
             if self.options.restart:
                 orig = list(testdescs)
                 while testdescs:
                     desc = testdescs[0]
                     # desc['path'] is a relative path
                     if 'case' in desc:
                         casestr = b'#'.join(desc['case'])
                         errpath = b'%s#%s.err' % (desc['path'], casestr)
                     else:
                         errpath = b'%s.err' % desc['path']
                     errpath = os.path.join(self._outputdir, errpath)
                     if os.path.exists(errpath):
                         break
                     testdescs.pop(0)
                 if not testdescs:
                     print("running all tests")
                     testdescs = orig
 
             tests = [self._gettest(d, i) for i, d in enumerate(testdescs)]
             num_tests = len(tests) * self.options.runs_per_test
 
             jobs = min(num_tests, self.options.jobs)
 
             failed = False
             kws = self.options.keywords
             if kws is not None and PYTHON3:
                 kws = kws.encode('utf-8')
 
             suite = TestSuite(self._testdir,
                               jobs=jobs,
                               whitelist=self.options.whitelisted,
                               blacklist=self.options.blacklist,
                               retest=self.options.retest,
                               keywords=kws,
                               loop=self.options.loop,
                               runs_per_test=self.options.runs_per_test,
                               showchannels=self.options.showchannels,
                               tests=tests, loadtest=_reloadtest)
             verbosity = 1
             if self.options.list_tests:
                 verbosity = 0
             elif self.options.verbose:
                 verbosity = 2
             runner = TextTestRunner(self, verbosity=verbosity)
 
             if self.options.list_tests:
                 result = runner.listtests(suite)
             else:
                 if self._installdir:
                     self._installhg()
                     self._checkhglib("Testing")
                 else:
                     self._usecorrectpython()
                 if self.options.chg:
                     assert self._installdir
                     self._installchg()
 
                 log('running %d tests using %d parallel processes' % (
                     num_tests, jobs))
 
                 result = runner.run(suite)
 
             if result.failures or result.errors:
                 failed = True
 
             result.onEnd()
 
             if self.options.anycoverage:
                 self._outputcoverage()
         except KeyboardInterrupt:
             failed = True
             print("\ninterrupted!")
 
         if failed:
             return 1
 
     def _getport(self, count):
         port = self._ports.get(count) # do we have a cached entry?
         if port is None:
             portneeded = 3
             # above 100 tries we just give up and let test reports failure
             for tries in xrange(100):
                 allfree = True
                 port = self.options.port + self._portoffset
                 for idx in xrange(portneeded):
                     if not checkportisavailable(port + idx):
                         allfree = False
                         break
                 self._portoffset += portneeded
                 if allfree:
                     break
             self._ports[count] = port
         return port
 
     def _gettest(self, testdesc, count):
         """Obtain a Test by looking at its filename.
 
         Returns a Test instance. The Test may not be runnable if it doesn't
         map to a known type.
         """
         path = testdesc['path']
         lctest = path.lower()
         testcls = Test
 
         for ext, cls in self.TESTTYPES:
             if lctest.endswith(ext):
                 testcls = cls
                 break
 
         refpath = os.path.join(getcwdb(), path)
         tmpdir = os.path.join(self._hgtmp, b'child%d' % count)
 
         # extra keyword parameters. 'case' is used by .t tests
         kwds = dict((k, testdesc[k]) for k in ['case'] if k in testdesc)
 
         t = testcls(refpath, self._outputdir, tmpdir,
                     keeptmpdir=self.options.keep_tmpdir,
                     debug=self.options.debug,
                     first=self.options.first,
                     timeout=self.options.timeout,
                     startport=self._getport(count),
                     extraconfigopts=self.options.extra_config_opt,
                     py3warnings=self.options.py3_warnings,
                     shell=self.options.shell,
                     hgcommand=self._hgcommand,
                     usechg=bool(self.options.with_chg or self.options.chg),
                     useipv6=useipv6, **kwds)
         t.should_reload = True
         return t
 
     def _cleanup(self):
         """Clean up state from this test invocation."""
         if self.options.keep_tmpdir:
             return
 
         vlog("# Cleaning up HGTMP", self._hgtmp)
         shutil.rmtree(self._hgtmp, True)
         for f in self._createdfiles:
             try:
                 os.remove(f)
             except OSError:
                 pass
 
     def _usecorrectpython(self):
         """Configure the environment to use the appropriate Python in tests."""
         # Tests must use the same interpreter as us or bad things will happen.
         pyexename = sys.platform == 'win32' and b'python.exe' or b'python'
 
         # os.symlink() is a thing with py3 on Windows, but it requires
         # Administrator rights.
         if getattr(os, 'symlink', None) and os.name != 'nt':
             vlog("# Making python executable in test path a symlink to '%s'" %
-                 sys.executable)
+                 sysexecutable)
             mypython = os.path.join(self._tmpbindir, pyexename)
             try:
-                if os.readlink(mypython) == sys.executable:
+                if os.readlink(mypython) == sysexecutable:
                     return
                 os.unlink(mypython)
             except OSError as err:
                 if err.errno != errno.ENOENT:
                     raise
-            if self._findprogram(pyexename) != sys.executable:
+            if self._findprogram(pyexename) != sysexecutable:
                 try:
-                    os.symlink(sys.executable, mypython)
+                    os.symlink(sysexecutable, mypython)
                     self._createdfiles.append(mypython)
                 except OSError as err:
                     # child processes may race, which is harmless
                     if err.errno != errno.EEXIST:
                         raise
         else:
-            exedir, exename = os.path.split(sys.executable)
+            exedir, exename = os.path.split(sysexecutable)
             vlog("# Modifying search path to find %s as %s in '%s'" %
                  (exename, pyexename, exedir))
             path = os.environ['PATH'].split(os.pathsep)
             while exedir in path:
                 path.remove(exedir)
             os.environ['PATH'] = os.pathsep.join([exedir] + path)
             if not self._findprogram(pyexename):
                 print("WARNING: Cannot find %s in search path" % pyexename)
 
     def _installhg(self):
         """Install hg into the test environment.
 
         This will also configure hg with the appropriate testing settings.
         """
         vlog("# Performing temporary installation of HG")
         installerrs = os.path.join(self._hgtmp, b"install.err")
         compiler = ''
         if self.options.compiler:
             compiler = '--compiler ' + self.options.compiler
         if self.options.pure:
             pure = b"--pure"
         else:
             pure = b""
 
         # Run installer in hg root
         script = os.path.realpath(sys.argv[0])
-        exe = sys.executable
+        exe = sysexecutable
         if PYTHON3:
             compiler = _bytespath(compiler)
             script = _bytespath(script)
             exe = _bytespath(exe)
         hgroot = os.path.dirname(os.path.dirname(script))
         self._hgroot = hgroot
         os.chdir(hgroot)
         nohome = b'--home=""'
         if os.name == 'nt':
             # The --home="" trick works only on OS where os.sep == '/'
             # because of a distutils convert_path() fast-path. Avoid it at
             # least on Windows for now, deal with .pydistutils.cfg bugs
             # when they happen.
             nohome = b''
         cmd = (b'"%(exe)s" setup.py %(pure)s clean --all'
                b' build %(compiler)s --build-base="%(base)s"'
                b' install --force --prefix="%(prefix)s"'
                b' --install-lib="%(libdir)s"'
                b' --install-scripts="%(bindir)s" %(nohome)s >%(logfile)s 2>&1'
                % {b'exe': exe, b'pure': pure,
                   b'compiler': compiler,
                   b'base': os.path.join(self._hgtmp, b"build"),
                   b'prefix': self._installdir, b'libdir': self._pythondir,
                   b'bindir': self._bindir,
                   b'nohome': nohome, b'logfile': installerrs})
 
         # setuptools requires install directories to exist.
         def makedirs(p):
             try:
                 os.makedirs(p)
             except OSError as e:
                 if e.errno != errno.EEXIST:
                     raise
         makedirs(self._pythondir)
         makedirs(self._bindir)
 
         vlog("# Running", cmd)
         if subprocess.call(_strpath(cmd), shell=True) == 0:
             if not self.options.verbose:
                 try:
                     os.remove(installerrs)
                 except OSError as e:
                     if e.errno != errno.ENOENT:
                         raise
         else:
             with open(installerrs, 'rb') as f:
                 for line in f:
                     if PYTHON3:
                         sys.stdout.buffer.write(line)
                     else:
                         sys.stdout.write(line)
             sys.exit(1)
         os.chdir(self._testdir)
 
         self._usecorrectpython()
 
         if self.options.py3_warnings and not self.options.anycoverage:
             vlog("# Updating hg command to enable Py3k Warnings switch")
             with open(os.path.join(self._bindir, 'hg'), 'rb') as f:
                 lines = [line.rstrip() for line in f]
                 lines[0] += ' -3'
             with open(os.path.join(self._bindir, 'hg'), 'wb') as f:
                 for line in lines:
                     f.write(line + '\n')
 
         hgbat = os.path.join(self._bindir, b'hg.bat')
         if os.path.isfile(hgbat):
             # hg.bat expects to be put in bin/scripts while run-tests.py
             # installation layout put it in bin/ directly. Fix it
             with open(hgbat, 'rb') as f:
                 data = f.read()
             if br'"%~dp0..\python" "%~dp0hg" %*' in data:
                 data = data.replace(br'"%~dp0..\python" "%~dp0hg" %*',
                                     b'"%~dp0python" "%~dp0hg" %*')
                 with open(hgbat, 'wb') as f:
                     f.write(data)
             else:
                 print('WARNING: cannot fix hg.bat reference to python.exe')
 
         if self.options.anycoverage:
             custom = os.path.join(self._testdir, 'sitecustomize.py')
             target = os.path.join(self._pythondir, 'sitecustomize.py')
             vlog('# Installing coverage trigger to %s' % target)
             shutil.copyfile(custom, target)
             rc = os.path.join(self._testdir, '.coveragerc')
             vlog('# Installing coverage rc to %s' % rc)
             os.environ['COVERAGE_PROCESS_START'] = rc
             covdir = os.path.join(self._installdir, '..', 'coverage')
             try:
                 os.mkdir(covdir)
             except OSError as e:
                 if e.errno != errno.EEXIST:
                     raise
 
             os.environ['COVERAGE_DIR'] = covdir
 
     def _checkhglib(self, verb):
         """Ensure that the 'mercurial' package imported by python is
         the one we expect it to be.  If not, print a warning to stderr."""
         if ((self._bindir == self._pythondir) and
             (self._bindir != self._tmpbindir)):
             # The pythondir has been inferred from --with-hg flag.
             # We cannot expect anything sensible here.
             return
         expecthg = os.path.join(self._pythondir, b'mercurial')
         actualhg = self._gethgpath()
         if os.path.abspath(actualhg) != os.path.abspath(expecthg):
             sys.stderr.write('warning: %s with unexpected mercurial lib: %s\n'
                              '         (expected %s)\n'
                              % (verb, actualhg, expecthg))
     def _gethgpath(self):
         """Return the path to the mercurial package that is actually found by
         the current Python interpreter."""
         if self._hgpath is not None:
             return self._hgpath
 
         cmd = b'"%s" -c "import mercurial; print (mercurial.__path__[0])"'
         cmd = cmd % PYTHON
         if PYTHON3:
             cmd = _strpath(cmd)
 
         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
         out, err = p.communicate()
 
         self._hgpath = out.strip()
 
         return self._hgpath
 
     def _installchg(self):
         """Install chg into the test environment"""
         vlog('# Performing temporary installation of CHG')
         assert os.path.dirname(self._bindir) == self._installdir
         assert self._hgroot, 'must be called after _installhg()'
         cmd = (b'"%(make)s" clean install PREFIX="%(prefix)s"'
                % {b'make': b'make',  # TODO: switch by option or environment?
                   b'prefix': self._installdir})
         cwd = os.path.join(self._hgroot, b'contrib', b'chg')
         vlog("# Running", cmd)
         proc = subprocess.Popen(cmd, shell=True, cwd=cwd,
                                 stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                                 stderr=subprocess.STDOUT)
         out, _err = proc.communicate()
         if proc.returncode != 0:
             if PYTHON3:
                 sys.stdout.buffer.write(out)
             else:
                 sys.stdout.write(out)
             sys.exit(1)
 
     def _outputcoverage(self):
         """Produce code coverage output."""
         import coverage
         coverage = coverage.coverage
 
         vlog('# Producing coverage report')
         # chdir is the easiest way to get short, relative paths in the
         # output.
         os.chdir(self._hgroot)
         covdir = os.path.join(self._installdir, '..', 'coverage')
         cov = coverage(data_file=os.path.join(covdir, 'cov'))
 
         # Map install directory paths back to source directory.
         cov.config.paths['srcdir'] = ['.', self._pythondir]
 
         cov.combine()
 
         omit = [os.path.join(x, '*') for x in [self._bindir, self._testdir]]
         cov.report(ignore_errors=True, omit=omit)
 
         if self.options.htmlcov:
             htmldir = os.path.join(self._outputdir, 'htmlcov')
             cov.html_report(directory=htmldir, omit=omit)
         if self.options.annotate:
             adir = os.path.join(self._outputdir, 'annotated')
             if not os.path.isdir(adir):
                 os.mkdir(adir)
             cov.annotate(directory=adir, omit=omit)
 
     def _findprogram(self, program):
         """Search PATH for a executable program"""
         dpb = _bytespath(os.defpath)
         sepb = _bytespath(os.pathsep)
         for p in osenvironb.get(b'PATH', dpb).split(sepb):
             name = os.path.join(p, program)
             if os.name == 'nt' or os.access(name, os.X_OK):
                 return name
         return None
 
     def _checktools(self):
         """Ensure tools required to run tests are present."""
         for p in self.REQUIREDTOOLS:
             if os.name == 'nt' and not p.endswith(b'.exe'):
                 p += b'.exe'
             found = self._findprogram(p)
             if found:
                 vlog("# Found prerequisite", p, "at", found)
             else:
                 print("WARNING: Did not find prerequisite tool: %s " %
                       p.decode("utf-8"))
 
 def aggregateexceptions(path):
     exceptioncounts = collections.Counter()
     testsbyfailure = collections.defaultdict(set)
     failuresbytest = collections.defaultdict(set)
 
     for f in os.listdir(path):
         with open(os.path.join(path, f), 'rb') as fh:
             data = fh.read().split(b'\0')
             if len(data) != 5:
                 continue
 
             exc, mainframe, hgframe, hgline, testname = data
             exc = exc.decode('utf-8')
             mainframe = mainframe.decode('utf-8')
             hgframe = hgframe.decode('utf-8')
             hgline = hgline.decode('utf-8')
             testname = testname.decode('utf-8')
 
             key = (hgframe, hgline, exc)
             exceptioncounts[key] += 1
             testsbyfailure[key].add(testname)
             failuresbytest[testname].add(key)
 
     # Find test having fewest failures for each failure.
     leastfailing = {}
     for key, tests in testsbyfailure.items():
         fewesttest = None
         fewestcount = 99999999
         for test in sorted(tests):
             if len(failuresbytest[test]) < fewestcount:
                 fewesttest = test
                 fewestcount = len(failuresbytest[test])
 
         leastfailing[key] = (fewestcount, fewesttest)
 
     # Create a combined counter so we can sort by total occurrences and
     # impacted tests.
     combined = {}
     for key in exceptioncounts:
         combined[key] = (exceptioncounts[key],
                          len(testsbyfailure[key]),
                          leastfailing[key][0],
                          leastfailing[key][1])
 
     return {
         'exceptioncounts': exceptioncounts,
         'total': sum(exceptioncounts.values()),
         'combined': combined,
         'leastfailing': leastfailing,
         'byfailure': testsbyfailure,
         'bytest': failuresbytest,
     }
 
 if __name__ == '__main__':
     runner = TestRunner()
 
     try:
         import msvcrt
         msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
         msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
         msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
     except ImportError:
         pass
 
     sys.exit(runner.run(sys.argv[1:]))