run-tests: add --loop support

This makes it easy to run tests repeatedly at high loads to look for test failures.

tests/run-tests.py

@@ -1,1253 +1,1257 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
 #
 # (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 distutils import version
 import difflib
 import errno
 import optparse
 import os
 import shutil
 import subprocess
 import signal
 import sys
 import tempfile
 import time
 import random
 import re
 import threading
 import killdaemons as killmod
 import cPickle as pickle
 import Queue as queue
 
 processlock = threading.Lock()
 
 closefds = os.name == 'posix'
 def Popen4(cmd, wd, timeout, env=None):
     processlock.acquire()
     p = subprocess.Popen(cmd, shell=True, bufsize=-1, cwd=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
 
 # reserved exit code to skip test (used by hghave)
 SKIPPED_STATUS = 80
 SKIPPED_PREFIX = 'skipped: '
 FAILED_PREFIX  = 'hghave check failed: '
 PYTHON = sys.executable.replace('\\', '/')
 IMPL_PATH = 'PYTHONPATH'
 if 'java' in sys.platform:
     IMPL_PATH = 'JYTHONPATH'
 
 requiredtools = [os.path.basename(sys.executable), "diff", "grep", "unzip",
                  "gunzip", "bunzip2", "sed"]
 
 defaults = {
     'jobs': ('HGTEST_JOBS', 1),
     'timeout': ('HGTEST_TIMEOUT', 180),
     'port': ('HGTEST_PORT', 20059),
     'shell': ('HGTEST_SHELL', 'sh'),
 }
 
 def parselistfiles(files, listtype, warn=True):
     entries = dict()
     for filename in files:
         try:
             path = os.path.expanduser(os.path.expandvars(filename))
             f = open(path, "r")
         except IOError, 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('#', 1)[0].strip()
             if line:
                 entries[line] = filename
 
         f.close()
     return entries
 
 def parseargs():
     parser = optparse.OptionParser("%prog [options] [tests]")
 
     # keep these sorted
     parser.add_option("--blacklist", action="append",
         help="skip tests listed in the specified blacklist file")
     parser.add_option("--whitelist", action="append",
         help="always run tests listed in the specified whitelist file")
     parser.add_option("-C", "--annotate", action="store_true",
         help="output files annotated with coverage")
     parser.add_option("-c", "--cover", action="store_true",
         help="print a test coverage report")
     parser.add_option("-d", "--debug", action="store_true",
         help="debug mode: write output of test scripts to console"
              " rather than capturing and diff'ing it (disables timeout)")
     parser.add_option("-f", "--first", action="store_true",
         help="exit on the first test failure")
     parser.add_option("-H", "--htmlcov", action="store_true",
         help="create an HTML report of the coverage of the files")
     parser.add_option("--inotify", action="store_true",
         help="enable inotify extension when running tests")
     parser.add_option("-i", "--interactive", action="store_true",
         help="prompt to accept changed output")
     parser.add_option("-j", "--jobs", type="int",
         help="number of jobs to run in parallel"
              " (default: $%s or %d)" % defaults['jobs'])
     parser.add_option("--keep-tmpdir", action="store_true",
         help="keep temporary directory after running tests")
     parser.add_option("-k", "--keywords",
         help="run tests matching keywords")
     parser.add_option("-l", "--local", action="store_true",
         help="shortcut for --with-hg=<testdir>/../hg")
+    parser.add_option("--loop", action="store_true",
+        help="loop tests repeatedly")
     parser.add_option("-n", "--nodiff", action="store_true",
         help="skip showing test changes")
     parser.add_option("-p", "--port", type="int",
         help="port on which servers should listen"
              " (default: $%s or %d)" % defaults['port'])
     parser.add_option("--compiler", type="string",
         help="compiler to build with")
     parser.add_option("--pure", action="store_true",
         help="use pure Python code instead of C extensions")
     parser.add_option("-R", "--restart", action="store_true",
         help="restart at last error")
     parser.add_option("-r", "--retest", action="store_true",
         help="retest failed tests")
     parser.add_option("-S", "--noskips", action="store_true",
         help="don't report skip tests verbosely")
     parser.add_option("--shell", type="string",
         help="shell to use (default: $%s or %s)" % defaults['shell'])
     parser.add_option("-t", "--timeout", type="int",
         help="kill errant tests after TIMEOUT seconds"
              " (default: $%s or %d)" % defaults['timeout'])
     parser.add_option("--time", action="store_true",
         help="time how long each test takes")
     parser.add_option("--tmpdir", type="string",
         help="run tests in the given temporary directory"
              " (implies --keep-tmpdir)")
     parser.add_option("-v", "--verbose", action="store_true",
         help="output verbose messages")
     parser.add_option("--view", type="string",
         help="external diff viewer")
     parser.add_option("--with-hg", type="string",
         metavar="HG",
         help="test using specified hg script rather than a "
              "temporary installation")
     parser.add_option("-3", "--py3k-warnings", action="store_true",
         help="enable Py3k warnings on Python 2.6+")
     parser.add_option('--extra-config-opt', action="append",
                       help='set the given config opt in the test hgrc')
     parser.add_option('--random', action="store_true",
                       help='run tests in random order')
 
     for option, (envvar, default) in defaults.items():
         defaults[option] = type(default)(os.environ.get(envvar, default))
     parser.set_defaults(**defaults)
     (options, args) = parser.parse_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 = os.path.expanduser(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 not os.path.basename(options.with_hg) == 'hg':
             sys.stderr.write('warning: --with-hg should specify an hg script\n')
     if options.local:
         testdir = os.path.dirname(os.path.realpath(sys.argv[0]))
         hgbin = os.path.join(os.path.dirname(testdir), 'hg')
         if os.name != 'nt' and not os.access(hgbin, os.X_OK):
             parser.error('--local specified, but %r not found or not executable'
                          % hgbin)
         options.with_hg = hgbin
 
     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")
 
     global verbose
     if options.verbose:
         verbose = ''
 
     if options.tmpdir:
         options.tmpdir = os.path.expanduser(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')
         options.timeout = 0
         if options.time:
             sys.stderr.write(
                 'warning: --time option ignored with --debug\n')
         options.time = False
     if options.py3k_warnings:
         if sys.version_info[:2] < (2, 6) or sys.version_info[:2] >= (3, 0):
             parser.error('--py3k-warnings can only be used on Python 2.6+')
     if options.blacklist:
         options.blacklist = parselistfiles(options.blacklist, 'blacklist')
     if options.whitelist:
         options.whitelisted = parselistfiles(options.whitelist, 'whitelist')
     else:
         options.whitelisted = {}
 
     return (options, args)
 
 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 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(SKIPPED_PREFIX):
             line = line.splitlines()[0]
             missing.append(line[len(SKIPPED_PREFIX):])
         elif line.startswith(FAILED_PREFIX):
             line = line.splitlines()[0]
             failed.append(line[len(FAILED_PREFIX):])
 
     return missing, failed
 
 def showdiff(expected, output, ref, err):
     print
     for line in difflib.unified_diff(expected, output, ref, err):
         sys.stdout.write(line)
 
 verbose = False
 def vlog(*msg):
     if verbose is not False:
         iolock.acquire()
         if verbose:
             print verbose,
         for m in msg:
             print m,
         print
         sys.stdout.flush()
         iolock.release()
 
 def log(*msg):
     iolock.acquire()
     if verbose:
         print verbose,
     for m in msg:
         print m,
     print
     sys.stdout.flush()
     iolock.release()
 
 def findprogram(program):
     """Search PATH for a executable program"""
     for p in os.environ.get('PATH', os.defpath).split(os.pathsep):
         name = os.path.join(p, program)
         if os.name == 'nt' or os.access(name, os.X_OK):
             return name
     return None
 
 def createhgrc(path, options):
     # create a fresh hgrc
     hgrc = open(path, 'w+')
     hgrc.write('[ui]\n')
     hgrc.write('slash = True\n')
     hgrc.write('interactive = False\n')
     hgrc.write('[defaults]\n')
     hgrc.write('backout = -d "0 0"\n')
     hgrc.write('commit = -d "0 0"\n')
     hgrc.write('tag = -d "0 0"\n')
     if options.inotify:
         hgrc.write('[extensions]\n')
         hgrc.write('inotify=\n')
         hgrc.write('[inotify]\n')
         hgrc.write('pidfile=daemon.pids')
         hgrc.write('appendpid=True\n')
     if options.extra_config_opt:
         for opt in options.extra_config_opt:
             section, key = opt.split('.', 1)
             assert '=' in key, ('extra config opt %s must '
                                 'have an = for assignment' % opt)
             hgrc.write('[%s]\n%s\n' % (section, key))
     hgrc.close()
 
 def createenv(options, testtmp, threadtmp, port):
     env = os.environ.copy()
     env['TESTTMP'] = testtmp
     env['HOME'] = testtmp
     env["HGPORT"] = str(port)
     env["HGPORT1"] = str(port + 1)
     env["HGPORT2"] = str(port + 2)
     env["HGRCPATH"] = os.path.join(threadtmp, '.hgrc')
     env["DAEMON_PIDS"] = os.path.join(threadtmp, 'daemon.pids')
     env["HGEDITOR"] = sys.executable + ' -c "import sys; sys.exit(0)"'
     env["HGMERGE"] = "internal:merge"
     env["HGUSER"]   = "test"
     env["HGENCODING"] = "ascii"
     env["HGENCODINGMODE"] = "strict"
 
     # 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'
 
     for k in ('HG HGPROF CDPATH GREP_OPTIONS http_proxy no_proxy ' +
               'NO_PROXY').split():
         if k in env:
             del env[k]
 
     # unset env related to hooks
     for k in env.keys():
         if k.startswith('HG_'):
             del env[k]
 
     return env
 
 def checktools():
     # Before we go any further, check for pre-requisite tools
     # stuff from coreutils (cat, rm, etc) are not tested
     for p in requiredtools:
         if os.name == 'nt' and not p.endswith('.exe'):
             p += '.exe'
         found = findprogram(p)
         if found:
             vlog("# Found prerequisite", p, "at", found)
         else:
             print "WARNING: Did not find prerequisite tool: "+p
 
 def terminate(proc):
     """Terminate subprocess (with fallback for Python versions < 2.6)"""
     vlog('# Terminating process %d' % proc.pid)
     try:
         getattr(proc, 'terminate', lambda : os.kill(proc.pid, signal.SIGTERM))()
     except OSError:
         pass
 
 def killdaemons(pidfile):
     return killmod.killdaemons(pidfile, tryhard=False, remove=True,
                                logfn=vlog)
 
 def cleanup(options):
     if not options.keep_tmpdir:
         vlog("# Cleaning up HGTMP", HGTMP)
         shutil.rmtree(HGTMP, True)
 
 def usecorrectpython():
     # some tests run python interpreter. they must use same
     # interpreter we use or bad things will happen.
     pyexename = sys.platform == 'win32' and 'python.exe' or 'python'
     if getattr(os, 'symlink', None):
         vlog("# Making python executable in test path a symlink to '%s'" %
              sys.executable)
         mypython = os.path.join(BINDIR, pyexename)
         try:
             if os.readlink(mypython) == sys.executable:
                 return
             os.unlink(mypython)
         except OSError, err:
             if err.errno != errno.ENOENT:
                 raise
         if findprogram(pyexename) != sys.executable:
             try:
                 os.symlink(sys.executable, mypython)
             except OSError, err:
                 # child processes may race, which is harmless
                 if err.errno != errno.EEXIST:
                     raise
     else:
         exedir, exename = os.path.split(sys.executable)
         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 findprogram(pyexename):
             print "WARNING: Cannot find %s in search path" % pyexename
 
 def installhg(options):
     vlog("# Performing temporary installation of HG")
     installerrs = os.path.join("tests", "install.err")
     compiler = ''
     if options.compiler:
         compiler = '--compiler ' + options.compiler
     pure = options.pure and "--pure" or ""
 
     # Run installer in hg root
     script = os.path.realpath(sys.argv[0])
     hgroot = os.path.dirname(os.path.dirname(script))
     os.chdir(hgroot)
     nohome = '--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 = ''
     cmd = ('%(exe)s setup.py %(pure)s clean --all'
            ' build %(compiler)s --build-base="%(base)s"'
            ' install --force --prefix="%(prefix)s" --install-lib="%(libdir)s"'
            ' --install-scripts="%(bindir)s" %(nohome)s >%(logfile)s 2>&1'
            % dict(exe=sys.executable, pure=pure, compiler=compiler,
                   base=os.path.join(HGTMP, "build"),
                   prefix=INST, libdir=PYTHONDIR, bindir=BINDIR,
                   nohome=nohome, logfile=installerrs))
     vlog("# Running", cmd)
     if os.system(cmd) == 0:
         if not options.verbose:
             os.remove(installerrs)
     else:
         f = open(installerrs)
         for line in f:
             print line,
         f.close()
         sys.exit(1)
     os.chdir(TESTDIR)
 
     usecorrectpython()
 
     vlog("# Installing dummy diffstat")
     f = open(os.path.join(BINDIR, 'diffstat'), 'w')
     f.write('#!' + sys.executable + '\n'
             'import sys\n'
             'files = 0\n'
             'for line in sys.stdin:\n'
             '    if line.startswith("diff "):\n'
             '        files += 1\n'
             'sys.stdout.write("files patched: %d\\n" % files)\n')
     f.close()
     os.chmod(os.path.join(BINDIR, 'diffstat'), 0700)
 
     if options.py3k_warnings and not options.anycoverage:
         vlog("# Updating hg command to enable Py3k Warnings switch")
         f = open(os.path.join(BINDIR, 'hg'), 'r')
         lines = [line.rstrip() for line in f]
         lines[0] += ' -3'
         f.close()
         f = open(os.path.join(BINDIR, 'hg'), 'w')
         for line in lines:
             f.write(line + '\n')
         f.close()
 
     hgbat = os.path.join(BINDIR, '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
         f = open(hgbat, 'rb')
         data = f.read()
         f.close()
         if '"%~dp0..\python" "%~dp0hg" %*' in data:
             data = data.replace('"%~dp0..\python" "%~dp0hg" %*',
                                 '"%~dp0python" "%~dp0hg" %*')
             f = open(hgbat, 'wb')
             f.write(data)
             f.close()
         else:
             print 'WARNING: cannot fix hg.bat reference to python.exe'
 
     if options.anycoverage:
         custom = os.path.join(TESTDIR, 'sitecustomize.py')
         target = os.path.join(PYTHONDIR, 'sitecustomize.py')
         vlog('# Installing coverage trigger to %s' % target)
         shutil.copyfile(custom, target)
         rc = os.path.join(TESTDIR, '.coveragerc')
         vlog('# Installing coverage rc to %s' % rc)
         os.environ['COVERAGE_PROCESS_START'] = rc
         fn = os.path.join(INST, '..', '.coverage')
         os.environ['COVERAGE_FILE'] = fn
 
 def outputtimes(options):
     vlog('# Producing time report')
     times.sort(key=lambda t: (t[1], t[0]), reverse=True)
     cols = '%7.3f   %s'
     print '\n%-7s   %s' % ('Time', 'Test')
     for test, timetaken in times:
         print cols % (timetaken, test)
 
 def outputcoverage(options):
 
     vlog('# Producing coverage report')
     os.chdir(PYTHONDIR)
 
     def covrun(*args):
         cmd = 'coverage %s' % ' '.join(args)
         vlog('# Running: %s' % cmd)
         os.system(cmd)
 
     covrun('-c')
     omit = ','.join(os.path.join(x, '*') for x in [BINDIR, TESTDIR])
     covrun('-i', '-r', '"--omit=%s"' % omit) # report
     if options.htmlcov:
         htmldir = os.path.join(TESTDIR, 'htmlcov')
         covrun('-i', '-b', '"--directory=%s"' % htmldir, '"--omit=%s"' % omit)
     if options.annotate:
         adir = os.path.join(TESTDIR, 'annotated')
         if not os.path.isdir(adir):
             os.mkdir(adir)
         covrun('-i', '-a', '"--directory=%s"' % adir, '"--omit=%s"' % omit)
 
 def pytest(test, wd, options, replacements, env):
     py3kswitch = options.py3k_warnings and ' -3' or ''
     cmd = '%s%s "%s"' % (PYTHON, py3kswitch, test)
     vlog("# Running", cmd)
     if os.name == 'nt':
         replacements.append((r'\r\n', '\n'))
     return run(cmd, wd, options, replacements, env)
 
 needescape = re.compile(r'[\x00-\x08\x0b-\x1f\x7f-\xff]').search
 escapesub = re.compile(r'[\x00-\x08\x0b-\x1f\\\x7f-\xff]').sub
 escapemap = dict((chr(i), r'\x%02x' % i) for i in range(256))
 escapemap.update({'\\': '\\\\', '\r': r'\r'})
 def escapef(m):
     return escapemap[m.group(0)]
 def stringescape(s):
     return escapesub(escapef, s)
 
 def rematch(el, l):
     try:
         # use \Z to ensure that the regex matches to the end of the string
         if os.name == 'nt':
             return re.match(el + r'\r?\n\Z', l)
         return re.match(el + r'\n\Z', l)
     except re.error:
         # el is an invalid regex
         return False
 
 def globmatch(el, l):
     # The only supported special characters are * and ? plus / which also
     # matches \ on windows. Escaping of these caracters is supported.
     if el + '\n' == l:
         if os.name == 'nt':
             # matching on "/" is not needed for this line
             log("\nInfo, unnecessary glob: %s (glob)" % el)
         return True
     i, n = 0, len(el)
     res = ''
     while i < n:
         c = el[i]
         i += 1
         if c == '\\' and el[i] in '*?\\/':
             res += el[i - 1:i + 1]
             i += 1
         elif c == '*':
             res += '.*'
         elif c == '?':
             res += '.'
         elif c == '/' and os.name == 'nt':
             res += '[/\\\\]'
         else:
             res += re.escape(c)
     return rematch(res, l)
 
 def linematch(el, l):
     if el == l: # perfect match (fast)
         return True
     if el:
         if el.endswith(" (esc)\n"):
             el = el[:-7].decode('string-escape') + '\n'
         if el == l or os.name == 'nt' and el[:-1] + '\r\n' == l:
             return True
         if (el.endswith(" (re)\n") and rematch(el[:-6], l) or
             el.endswith(" (glob)\n") and globmatch(el[:-8], l)):
             return True
     return False
 
 def tsttest(test, wd, options, replacements, env):
     # 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 = "SALT" + str(time.time())
     def addsalt(line, inpython):
         if inpython:
             script.append('%s %d 0\n' % (salt, line))
         else:
             script.append('echo %s %s $?\n' % (salt, line))
 
     # 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 = {}
     pos = prepos = -1
 
     # Expected shellscript output
     expected = {}
 
     # We keep track of whether or not we're in a Python block so we
     # can generate the surrounding doctest magic
     inpython = False
 
     # True or False when in a true or false conditional section
     skipping = None
 
     def hghave(reqs):
         # TODO: do something smarter when all other uses of hghave is gone
         tdir = TESTDIR.replace('\\', '/')
         proc = Popen4('%s -c "%s/hghave %s"' %
                       (options.shell, tdir, ' '.join(reqs)), wd, 0)
         stdout, stderr = proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
         if ret == 2:
             print stdout
             sys.exit(1)
         return ret == 0
 
     f = open(test)
     t = f.readlines()
     f.close()
 
     script = []
     if options.debug:
         script.append('set -x\n')
     if os.getenv('MSYSTEM'):
         script.append('alias pwd="pwd -W"\n')
     n = 0
     for n, l in enumerate(t):
         if not l.endswith('\n'):
             l += '\n'
         if l.startswith('#if'):
             if skipping is not None:
                 after.setdefault(pos, []).append('  !!! nested #if\n')
             skipping = not hghave(l.split()[1:])
             after.setdefault(pos, []).append(l)
         elif l.startswith('#else'):
             if skipping is None:
                 after.setdefault(pos, []).append('  !!! missing #if\n')
             skipping = not skipping
             after.setdefault(pos, []).append(l)
         elif l.startswith('#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('  >>> '): # 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('%s -m heredoctest <<EOF\n' % PYTHON)
             addsalt(n, True)
             script.append(l[2:])
         elif l.startswith('  ... '): # python inlines
             after.setdefault(prepos, []).append(l)
             script.append(l[2:])
         elif l.startswith('  $ '): # commands
             if inpython:
                 script.append("EOF\n")
                 inpython = False
             after.setdefault(pos, []).append(l)
             prepos = pos
             pos = n
             addsalt(n, False)
             cmd = l[4:].split()
             if len(cmd) == 2 and cmd[0] == 'cd':
                 l = '  $ cd %s || exit 1\n' % cmd[1]
             script.append(l[4:])
         elif l.startswith('  > '): # continuations
             after.setdefault(prepos, []).append(l)
             script.append(l[4:])
         elif l.startswith('  '): # results
             # queue up a list of expected results
             expected.setdefault(pos, []).append(l[2:])
         else:
             if inpython:
                 script.append("EOF\n")
                 inpython = False
             # non-command/result - queue up for merged output
             after.setdefault(pos, []).append(l)
 
     if inpython:
         script.append("EOF\n")
     if skipping is not None:
         after.setdefault(pos, []).append('  !!! missing #endif\n')
     addsalt(n + 1, False)
 
     # Write out the script and execute it
     fd, name = tempfile.mkstemp(suffix='hg-tst')
     try:
         for l in script:
             os.write(fd, l)
         os.close(fd)
 
         cmd = '%s "%s"' % (options.shell, name)
         vlog("# Running", cmd)
         exitcode, output = run(cmd, wd, options, replacements, env)
         # do not merge output if skipped, return hghave message instead
         # similarly, with --debug, output is None
         if exitcode == SKIPPED_STATUS or output is None:
             return exitcode, output
     finally:
         os.remove(name)
 
     # Merge the script output back into a unified test
 
     pos = -1
     postout = []
     ret = 0
     for l in output:
         lout, lcmd = l, None
         if salt in l:
             lout, lcmd = l.split(salt, 1)
 
         if lout:
             if not lout.endswith('\n'):
                 lout += ' (no-eol)\n'
 
             # find the expected output at the current position
             el = None
             if pos in expected and expected[pos]:
                 el = expected[pos].pop(0)
 
             if linematch(el, lout):
                 postout.append("  " + el)
             else:
                 if needescape(lout):
                     lout = stringescape(lout.rstrip('\n')) + " (esc)\n"
                 postout.append("  " + lout) # let diff deal with it
 
         if lcmd:
             # add on last return code
             ret = int(lcmd.split()[1])
             if ret != 0:
                 postout.append("  [%s]\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)
 
     return exitcode, postout
 
 wifexited = getattr(os, "WIFEXITED", lambda x: False)
 def run(cmd, wd, options, replacements, env):
     """Run command in a sub-process, capturing the output (stdout and stderr).
     Return a tuple (exitcode, output).  output is None in debug mode."""
     # TODO: Use subprocess.Popen if we're running on Python 2.4
     if options.debug:
         proc = subprocess.Popen(cmd, shell=True, cwd=wd, env=env)
         ret = proc.wait()
         return (ret, None)
 
     proc = Popen4(cmd, wd, options.timeout, env)
     def cleanup():
         terminate(proc)
         ret = proc.wait()
         if ret == 0:
             ret = signal.SIGTERM << 8
         killdaemons(env['DAEMON_PIDS'])
         return ret
 
     output = ''
     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'])
 
     if abort:
         raise KeyboardInterrupt()
 
     for s, r in replacements:
         output = re.sub(s, r, output)
     return ret, output.splitlines(True)
 
 def runone(options, test, count):
     '''returns a result element: (code, test, msg)'''
 
     def skip(msg):
         if options.verbose:
             log("\nSkipping %s: %s" % (testpath, msg))
         return 's', test, msg
 
     def fail(msg, ret):
         if not options.nodiff:
             log("\nERROR: %s %s" % (testpath, msg))
         if (not ret and options.interactive
             and os.path.exists(testpath + ".err")):
             iolock.acquire()
             print "Accept this change? [n] ",
             answer = sys.stdin.readline().strip()
             iolock.release()
             if answer.lower() in "y yes".split():
                 if test.endswith(".t"):
                     rename(testpath + ".err", testpath)
                 else:
                     rename(testpath + ".err", testpath + ".out")
                 return '.', test, ''
         return '!', test, msg
 
     def success():
         return '.', test, ''
 
     def ignore(msg):
         return 'i', test, msg
 
     def describe(ret):
         if ret < 0:
             return 'killed by signal %d' % -ret
         return 'returned error code %d' % ret
 
     testpath = os.path.join(TESTDIR, test)
     err = os.path.join(TESTDIR, test + ".err")
     lctest = test.lower()
 
     if not os.path.exists(testpath):
             return skip("doesn't exist")
 
     if not (options.whitelisted and test in options.whitelisted):
         if options.blacklist and test in options.blacklist:
             return skip("blacklisted")
 
         if options.retest and not os.path.exists(test + ".err"):
             ignore("not retesting")
             return None
 
         if options.keywords:
             fp = open(test)
             t = fp.read().lower() + test.lower()
             fp.close()
             for k in options.keywords.lower().split():
                 if k in t:
                     break
                 else:
                     ignore("doesn't match keyword")
                     return None
 
     for ext, func, out in testtypes:
         if lctest.startswith("test-") and lctest.endswith(ext):
             runner = func
             ref = os.path.join(TESTDIR, test + out)
             break
     else:
         return skip("unknown test type")
 
     vlog("# Test", test)
 
     if os.path.exists(err):
         os.remove(err)       # Remove any previous output files
 
     # Make a tmp subdirectory to work in
     threadtmp = os.path.join(HGTMP, "child%d" % count)
     testtmp = os.path.join(threadtmp, os.path.basename(test))
     os.mkdir(threadtmp)
     os.mkdir(testtmp)
 
     port = options.port + count * 3
     replacements = [
         (r':%s\b' % port, ':$HGPORT'),
         (r':%s\b' % (port + 1), ':$HGPORT1'),
         (r':%s\b' % (port + 2), ':$HGPORT2'),
         ]
     if os.name == 'nt':
         replacements.append(
             (''.join(c.isalpha() and '[%s%s]' % (c.lower(), c.upper()) or
                      c in '/\\' and r'[/\\]' or
                      c.isdigit() and c or
                      '\\' + c
                      for c in testtmp), '$TESTTMP'))
     else:
         replacements.append((re.escape(testtmp), '$TESTTMP'))
 
     env = createenv(options, testtmp, threadtmp, port)
     createhgrc(env['HGRCPATH'], options)
 
     if options.time:
         starttime = time.time()
     ret, out = runner(testpath, testtmp, options, replacements, env)
     if options.time:
         endtime = time.time()
         times.append((test, endtime - starttime))
     vlog("# Ret was:", ret)
 
     killdaemons(env['DAEMON_PIDS'])
 
     skipped = (ret == SKIPPED_STATUS)
 
     # If we're not in --debug mode and reference output file exists,
     # check test output against it.
     if options.debug:
         refout = None                   # to match "out is None"
     elif os.path.exists(ref):
         f = open(ref, "r")
         refout = f.read().splitlines(True)
         f.close()
     else:
         refout = []
 
     if (ret != 0 or out != refout) and not skipped and not options.debug:
         # Save errors to a file for diagnosis
         f = open(err, "wb")
         for line in out:
             f.write(line)
         f.close()
 
     if skipped:
         if out is None:                 # debug mode: nothing to parse
             missing = ['unknown']
             failed = None
         else:
             missing, failed = parsehghaveoutput(out)
         if not missing:
             missing = ['irrelevant']
         if failed:
             result = fail("hghave failed checking for %s" % failed[-1], ret)
             skipped = False
         else:
             result = skip(missing[-1])
     elif ret == 'timeout':
         result = fail("timed out", ret)
     elif out != refout:
         if not options.nodiff:
             iolock.acquire()
             if options.view:
                 os.system("%s %s %s" % (options.view, ref, err))
             else:
                 showdiff(refout, out, ref, err)
             iolock.release()
         if ret:
             result = fail("output changed and " + describe(ret), ret)
         else:
             result = fail("output changed", ret)
     elif ret:
         result = fail(describe(ret), ret)
     else:
         result = success()
 
     if not options.verbose:
         iolock.acquire()
         sys.stdout.write(result[0])
         sys.stdout.flush()
         iolock.release()
 
     if not options.keep_tmpdir:
         shutil.rmtree(threadtmp, True)
     return result
 
 _hgpath = None
 
 def _gethgpath():
     """Return the path to the mercurial package that is actually found by
     the current Python interpreter."""
     global _hgpath
     if _hgpath is not None:
         return _hgpath
 
     cmd = '%s -c "import mercurial; print mercurial.__path__[0]"'
     pipe = os.popen(cmd % PYTHON)
     try:
         _hgpath = pipe.read().strip()
     finally:
         pipe.close()
     return _hgpath
 
 def _checkhglib(verb):
     """Ensure that the 'mercurial' package imported by python is
     the one we expect it to be.  If not, print a warning to stderr."""
     expecthg = os.path.join(PYTHONDIR, 'mercurial')
     actualhg = _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))
 
 results = {'.':[], '!':[], 's':[], 'i':[]}
 times = []
 iolock = threading.Lock()
 abort = False
 
 def scheduletests(options, tests):
     jobs = options.jobs
     done = queue.Queue()
     running = 0
     count = 0
     global abort
 
     def job(test, count):
         try:
             done.put(runone(options, test, count))
         except KeyboardInterrupt:
             pass
 
     try:
         while tests or running:
             if not done.empty() or running == jobs or not tests:
                 try:
                     code, test, msg = done.get(True, 1)
                     results[code].append((test, msg))
                     if options.first and code not in '.si':
                         break
                 except queue.Empty:
                     continue
                 running -= 1
             if tests and not running == jobs:
                 test = tests.pop(0)
+                if options.loop:
+                    tests.append(test)
                 t = threading.Thread(None, job, args=(test, count))
                 t.start()
                 running += 1
                 count += 1
     except KeyboardInterrupt:
         abort = True
 
 def runtests(options, tests):
     try:
         if INST:
             installhg(options)
             _checkhglib("Testing")
         else:
             usecorrectpython()
 
         if options.restart:
             orig = list(tests)
             while tests:
                 if os.path.exists(tests[0] + ".err"):
                     break
                 tests.pop(0)
             if not tests:
                 print "running all tests"
                 tests = orig
 
         scheduletests(options, tests)
 
         failed = len(results['!'])
         tested = len(results['.']) + failed
         skipped = len(results['s'])
         ignored = len(results['i'])
 
         print
         for s in results['s']:
             print "Skipped %s: %s" % s
         for s in results['!']:
             print "Failed %s: %s" % s
         _checkhglib("Tested")
         print "# Ran %d tests, %d skipped, %d failed." % (
             tested, skipped + ignored, failed)
         if options.time:
             outputtimes(options)
 
         if options.anycoverage:
             outputcoverage(options)
     except KeyboardInterrupt:
         failed = True
         print "\ninterrupted!"
 
     if failed:
         sys.exit(1)
 
 testtypes = [('.py', pytest, '.out'),
              ('.t', tsttest, '')]
 
 def main():
     (options, args) = parseargs()
     os.umask(022)
 
     checktools()
 
     if len(args) == 0:
         args = [t for t in os.listdir(".")
                 if t.startswith("test-")
                 and (t.endswith(".py") or t.endswith(".t"))]
 
     tests = args
 
     if options.random:
         random.shuffle(tests)
     else:
         # keywords for slow tests
         slow = 'svn gendoc check-code-hg'.split()
         def sortkey(f):
             # run largest tests first, as they tend to take the longest
             val = -os.stat(f).st_size
             for kw in slow:
                 if kw in f:
                     val *= 10
             return val
         tests.sort(key=sortkey)
 
     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))
         print 'python hash seed:', os.environ['PYTHONHASHSEED']
 
     global TESTDIR, HGTMP, INST, BINDIR, PYTHONDIR, COVERAGE_FILE
     TESTDIR = os.environ["TESTDIR"] = os.getcwd()
     if options.tmpdir:
         options.keep_tmpdir = True
         tmpdir = 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.
             sys.exit("error: temp dir %r already exists" % tmpdir)
 
             # Automatically removing tmpdir sounds convenient, but could
             # really annoy anyone in the habit of using "--tmpdir=/tmp"
             # or "--tmpdir=$HOME".
             #vlog("# Removing temp dir", tmpdir)
             #shutil.rmtree(tmpdir)
         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 = os.getenv('TMP')
         tmpdir = tempfile.mkdtemp('', 'hgtests.', d)
     HGTMP = os.environ['HGTMP'] = os.path.realpath(tmpdir)
 
     if options.with_hg:
         INST = None
         BINDIR = os.path.dirname(os.path.realpath(options.with_hg))
 
         # This looks redundant with how Python initializes sys.path from
         # the location of the script being executed.  Needed because the
         # "hg" specified by --with-hg is not the only Python script
         # executed in the test suite that needs to import 'mercurial'
         # ... which means it's not really redundant at all.
         PYTHONDIR = BINDIR
     else:
         INST = os.path.join(HGTMP, "install")
         BINDIR = os.environ["BINDIR"] = os.path.join(INST, "bin")
         PYTHONDIR = os.path.join(INST, "lib", "python")
 
     os.environ["BINDIR"] = BINDIR
     os.environ["PYTHON"] = PYTHON
 
     path = [BINDIR] + os.environ["PATH"].split(os.pathsep)
     os.environ["PATH"] = os.pathsep.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
     pypath = [PYTHONDIR, TESTDIR]
     # 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 = os.environ.get(IMPL_PATH)
     if oldpypath:
         pypath.append(oldpypath)
     os.environ[IMPL_PATH] = os.pathsep.join(pypath)
 
     COVERAGE_FILE = os.path.join(TESTDIR, ".coverage")
 
     vlog("# Using TESTDIR", TESTDIR)
     vlog("# Using HGTMP", HGTMP)
     vlog("# Using PATH", os.environ["PATH"])
     vlog("# Using", IMPL_PATH, os.environ[IMPL_PATH])
 
     try:
         runtests(options, tests)
     finally:
         time.sleep(.1)
         cleanup(options)
 
 if __name__ == '__main__':
     main()