convert/cvs: add an option to disable remote log caching

Useful for debugging or testing when using --tmpdir.

hgext/convert/__init__.py

@@ -1,258 +1,261 b''
 # convert.py Foreign SCM converter
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 '''converting foreign VCS repositories to Mercurial'''
 
 import convcmd
 import cvsps
 import subversion
 from mercurial import commands
 from mercurial.i18n import _
 
 # Commands definition was moved elsewhere to ease demandload job.
 
 def convert(ui, src, dest=None, revmapfile=None, **opts):
     """convert a foreign SCM repository to a Mercurial one.
 
     Accepted source formats [identifiers]:
     - Mercurial [hg]
     - CVS [cvs]
     - Darcs [darcs]
     - git [git]
     - Subversion [svn]
     - Monotone [mtn]
     - GNU Arch [gnuarch]
     - Bazaar [bzr]
     - Perforce [p4]
 
     Accepted destination formats [identifiers]:
     - Mercurial [hg]
     - Subversion [svn] (history on branches is not preserved)
 
     If no revision is given, all revisions will be converted.
     Otherwise, convert will only import up to the named revision
     (given in a format understood by the source).
 
     If no destination directory name is specified, it defaults to the
     basename of the source with '-hg' appended. If the destination
     repository doesn't exist, it will be created.
 
     If <REVMAP> isn't given, it will be put in a default location
     (<dest>/.hg/shamap by default). The <REVMAP> is a simple text file
     that maps each source commit ID to the destination ID for that
     revision, like so:
     <source ID> <destination ID>
 
     If the file doesn't exist, it's automatically created. It's
     updated on each commit copied, so convert-repo can be interrupted
     and can be run repeatedly to copy new commits.
 
     The [username mapping] file is a simple text file that maps each
     source commit author to a destination commit author. It is handy
     for source SCMs that use unix logins to identify authors (eg:
     CVS). One line per author mapping and the line format is:
     srcauthor=whatever string you want
 
     The filemap is a file that allows filtering and remapping of files
     and directories. Comment lines start with '#'. Each line can
     contain one of the following directives:
 
       include path/to/file
 
       exclude path/to/file
 
       rename from/file to/file
 
     The 'include' directive causes a file, or all files under a
     directory, to be included in the destination repository, and the
     exclusion of all other files and directories not explicitely included.
     The 'exclude' directive causes files or directories to be omitted.
     The 'rename' directive renames a file or directory. To rename from
     a subdirectory into the root of the repository, use '.' as the
     path to rename to.
 
     The splicemap is a file that allows insertion of synthetic
     history, letting you specify the parents of a revision. This is
     useful if you want to e.g. give a Subversion merge two parents, or
     graft two disconnected series of history together. Each entry
     contains a key, followed by a space, followed by one or two
     comma-separated values. The key is the revision ID in the source
     revision control system whose parents should be modified (same
     format as a key in .hg/shamap). The values are the revision IDs
     (in either the source or destination revision control system) that
     should be used as the new parents for that node.
 
     Mercurial Source
     -----------------
 
     --config convert.hg.ignoreerrors=False    (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial
         repositories with missing revlogs, by converting from and to
         Mercurial.
     --config convert.hg.saverev=False         (boolean)
         store original revision ID in changeset (forces target IDs to
         change)
     --config convert.hg.startrev=0            (hg revision identifier)
         convert start revision and its descendants
 
     CVS Source
     ----------
 
     CVS source will use a sandbox (i.e. a checked-out copy) from CVS
     to indicate the starting point of what will be converted. Direct
     access to the repository files is not needed, unless of course the
     repository is :local:. The conversion uses the top level directory
     in the sandbox to find the CVS repository, and then uses CVS rlog
     commands to find files to convert. This means that unless a
     filemap is given, all files under the starting directory will be
     converted, and that any directory reorganisation in the CVS
     sandbox is ignored.
 
     Because CVS does not have changesets, it is necessary to collect
     individual commits to CVS and merge them into changesets. CVS
     source uses its internal changeset merging code by default but can
     be configured to call the external 'cvsps' program by setting:
         --config convert.cvsps='cvsps -A -u --cvs-direct -q'
     This is a legacy option and may be removed in future.
 
     The options shown are the defaults.
 
     Internal cvsps is selected by setting
         --config convert.cvsps=builtin
     and has a few more configurable options:
+        --config convert.cvsps.cache=True     (boolean)
+            Set to False to disable remote log caching, for testing and 
+            debugging purposes.
         --config convert.cvsps.fuzz=60        (integer)
             Specify the maximum time (in seconds) that is allowed
             between commits with identical user and log message in a
             single changeset. When very large files were checked in as
             part of a changeset then the default may not be long
             enough.
         --config convert.cvsps.mergeto='{{mergetobranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages
             are matched. If a match occurs, then the conversion
             process will insert a dummy revision merging the branch on
             which this log message occurs to the branch indicated in
             the regex.
         --config convert.cvsps.mergefrom='{{mergefrombranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages
             are matched. If a match occurs, then the conversion
             process will add the most recent revision on the branch
             indicated in the regex as the second parent of the
             changeset.
 
     The hgext/convert/cvsps wrapper script allows the builtin
     changeset merging code to be run without doing a conversion. Its
     parameters and output are similar to that of cvsps 2.1.
 
     Subversion Source
     -----------------
 
     Subversion source detects classical trunk/branches/tags layouts.
     By default, the supplied "svn://repo/path/" source URL is
     converted as a single branch. If "svn://repo/path/trunk" exists it
     replaces the default branch. If "svn://repo/path/branches" exists,
     its subdirectories are listed as possible branches. If
     "svn://repo/path/tags" exists, it is looked for tags referencing
     converted branches. Default "trunk", "branches" and "tags" values
     can be overriden with following options. Set them to paths
     relative to the source URL, or leave them blank to disable
     autodetection.
 
     --config convert.svn.branches=branches    (directory name)
         specify the directory containing branches
     --config convert.svn.tags=tags            (directory name)
         specify the directory containing tags
     --config convert.svn.trunk=trunk          (directory name)
         specify the name of the trunk branch
 
     Source history can be retrieved starting at a specific revision,
     instead of being integrally converted. Only single branch
     conversions are supported.
 
     --config convert.svn.startrev=0           (svn revision number)
         specify start Subversion revision.
 
     Perforce Source
     ---------------
 
     The Perforce (P4) importer can be given a p4 depot path or a
     client specification as source. It will convert all files in the
     source to a flat Mercurial repository, ignoring labels, branches
     and integrations. Note that when a depot path is given you then
     usually should specify a target directory, because otherwise the
     target may be named ...-hg.
 
     It is possible to limit the amount of source history to be
     converted by specifying an initial Perforce revision.
 
     --config convert.p4.startrev=0            (perforce changelist number)
         specify initial Perforce revision.
 
 
     Mercurial Destination
     ---------------------
 
     --config convert.hg.clonebranches=False   (boolean)
         dispatch source branches in separate clones.
     --config convert.hg.tagsbranch=default    (branch name)
         tag revisions branch name
     --config convert.hg.usebranchnames=True   (boolean)
         preserve branch names
 
     """
     return convcmd.convert(ui, src, dest, revmapfile, **opts)
 
 def debugsvnlog(ui, **opts):
     return subversion.debugsvnlog(ui, **opts)
 
 def debugcvsps(ui, *args, **opts):
     '''create changeset information from CVS
 
     This command is intended as a debugging tool for the CVS to
     Mercurial converter, and can be used as a direct replacement for
     cvsps.
 
     Hg debugcvsps reads the CVS rlog for current directory (or any
     named directory) in the CVS repository, and converts the log to a
     series of changesets based on matching commit log entries and
     dates.'''
     return cvsps.debugcvsps(ui, *args, **opts)
 
 commands.norepo += " convert debugsvnlog debugcvsps"
 
 cmdtable = {
     "convert":
         (convert,
          [('A', 'authors', '', _('username mapping filename')),
           ('d', 'dest-type', '', _('destination repository type')),
           ('', 'filemap', '', _('remap file names using contents of file')),
           ('r', 'rev', '', _('import up to target revision REV')),
           ('s', 'source-type', '', _('source repository type')),
           ('', 'splicemap', '', _('splice synthesized history into place')),
           ('', 'datesort', None, _('try to sort changesets by date'))],
          _('hg convert [OPTION]... SOURCE [DEST [REVMAP]]')),
     "debugsvnlog":
         (debugsvnlog,
          [],
          'hg debugsvnlog'),
     "debugcvsps":
         (debugcvsps,
          [
           # Main options shared with cvsps-2.1
           ('b', 'branches', [], _('only return changes on specified branches')),
           ('p', 'prefix', '', _('prefix to remove from file names')),
           ('r', 'revisions', [], _('only return changes after or between specified tags')),
           ('u', 'update-cache', None, _("update cvs log cache")),
           ('x', 'new-cache', None, _("create new cvs log cache")),
           ('z', 'fuzz', 60, _('set commit time fuzz in seconds')),
           ('', 'root', '', _('specify cvsroot')),
           # Options specific to builtin cvsps
           ('', 'parents', '', _('show parent changesets')),
           ('', 'ancestors', '', _('show current changeset in ancestor branches')),
           # Options that are ignored for compatibility with cvsps-2.1
           ('A', 'cvs-direct', None, _('ignored for compatibility')),
          ],
          _('hg debugcvsps [OPTION]... [PATH]...')),
 }

hgext/convert/cvs.py

@@ -1,359 +1,362 b''
 # CVS conversion code inspired by hg-cvs-import and git-cvsimport
 
 import os, locale, re, socket, errno
 from cStringIO import StringIO
 from mercurial import util
 from mercurial.i18n import _
 
 from common import NoRepo, commit, converter_source, checktool
 import cvsps
 
 class convert_cvs(converter_source):
     def __init__(self, ui, path, rev=None):
         super(convert_cvs, self).__init__(ui, path, rev=rev)
 
         cvs = os.path.join(path, "CVS")
         if not os.path.exists(cvs):
             raise NoRepo("%s does not look like a CVS checkout" % path)
 
         checktool('cvs')
         self.cmd = ui.config('convert', 'cvsps', 'builtin')
         cvspsexe = self.cmd.split(None, 1)[0]
         self.builtin = cvspsexe == 'builtin'
 
         if not self.builtin:
             checktool(cvspsexe)
 
         self.changeset = None
         self.files = {}
         self.tags = {}
         self.lastbranch = {}
         self.parent = {}
         self.socket = None
         self.cvsroot = file(os.path.join(cvs, "Root")).read()[:-1]
         self.cvsrepo = file(os.path.join(cvs, "Repository")).read()[:-1]
         self.encoding = locale.getpreferredencoding()
 
         self._connect()
 
     def _parse(self):
         if self.changeset is not None:
             return
         self.changeset = {}
 
         maxrev = 0
         cmd = self.cmd
         if self.rev:
             # TODO: handle tags
             try:
                 # patchset number?
                 maxrev = int(self.rev)
             except ValueError:
                 try:
                     # date
                     util.parsedate(self.rev, ['%Y/%m/%d %H:%M:%S'])
                     cmd = '%s -d "1970/01/01 00:00:01" -d "%s"' % (cmd, self.rev)
                 except util.Abort:
                     raise util.Abort(_('revision %s is not a patchset number or date') % self.rev)
 
         d = os.getcwd()
         try:
             os.chdir(self.path)
             id = None
             state = 0
             filerevids = {}
 
             if self.builtin:
                 # builtin cvsps code
                 self.ui.status(_('using builtin cvsps\n'))
 
-                db = cvsps.createlog(self.ui, cache='update')
+                cache = 'update'
+                if not self.ui.configbool('convert', 'cvsps.cache', True):
+                    cache = None
+                db = cvsps.createlog(self.ui, cache=cache)
                 db = cvsps.createchangeset(self.ui, db,
                       fuzz=int(self.ui.config('convert', 'cvsps.fuzz', 60)),
                       mergeto=self.ui.config('convert', 'cvsps.mergeto', None),
                       mergefrom=self.ui.config('convert', 'cvsps.mergefrom', None))
 
                 for cs in db:
                     if maxrev and cs.id>maxrev:
                         break
                     id = str(cs.id)
                     cs.author = self.recode(cs.author)
                     self.lastbranch[cs.branch] = id
                     cs.comment = self.recode(cs.comment)
                     date = util.datestr(cs.date)
                     self.tags.update(dict.fromkeys(cs.tags, id))
 
                     files = {}
                     for f in cs.entries:
                         files[f.file] = "%s%s" % ('.'.join([str(x) for x in f.revision]),
                                                   ['', '(DEAD)'][f.dead])
 
                     # add current commit to set
                     c = commit(author=cs.author, date=date,
                              parents=[str(p.id) for p in cs.parents],
                              desc=cs.comment, branch=cs.branch or '')
                     self.changeset[id] = c
                     self.files[id] = files
             else:
                 # external cvsps
                 for l in util.popen(cmd):
                     if state == 0: # header
                         if l.startswith("PatchSet"):
                             id = l[9:-2]
                             if maxrev and int(id) > maxrev:
                                 # ignore everything
                                 state = 3
                         elif l.startswith("Date:"):
                             date = util.parsedate(l[6:-1], ["%Y/%m/%d %H:%M:%S"])
                             date = util.datestr(date)
                         elif l.startswith("Branch:"):
                             branch = l[8:-1]
                             self.parent[id] = self.lastbranch.get(branch, 'bad')
                             self.lastbranch[branch] = id
                         elif l.startswith("Ancestor branch:"):
                             ancestor = l[17:-1]
                             # figure out the parent later
                             self.parent[id] = self.lastbranch[ancestor]
                         elif l.startswith("Author:"):
                             author = self.recode(l[8:-1])
                         elif l.startswith("Tag:") or l.startswith("Tags:"):
                             t = l[l.index(':')+1:]
                             t = [ut.strip() for ut in t.split(',')]
                             if (len(t) > 1) or (t[0] and (t[0] != "(none)")):
                                 self.tags.update(dict.fromkeys(t, id))
                         elif l.startswith("Log:"):
                             # switch to gathering log
                             state = 1
                             log = ""
                     elif state == 1: # log
                         if l == "Members: \n":
                             # switch to gathering members
                             files = {}
                             oldrevs = []
                             log = self.recode(log[:-1])
                             state = 2
                         else:
                             # gather log
                             log += l
                     elif state == 2: # members
                         if l == "\n": # start of next entry
                             state = 0
                             p = [self.parent[id]]
                             if id == "1":
                                 p = []
                             if branch == "HEAD":
                                 branch = ""
                             if branch:
                                 latest = 0
                                 # the last changeset that contains a base
                                 # file is our parent
                                 for r in oldrevs:
                                     latest = max(filerevids.get(r, 0), latest)
                                 if latest:
                                     p = [latest]
 
                             # add current commit to set
                             c = commit(author=author, date=date, parents=p,
                                        desc=log, branch=branch)
                             self.changeset[id] = c
                             self.files[id] = files
                         else:
                             colon = l.rfind(':')
                             file = l[1:colon]
                             rev = l[colon+1:-2]
                             oldrev, rev = rev.split("->")
                             files[file] = rev
 
                             # save some information for identifying branch points
                             oldrevs.append("%s:%s" % (oldrev, file))
                             filerevids["%s:%s" % (rev, file)] = id
                     elif state == 3:
                         # swallow all input
                         continue
 
             self.heads = self.lastbranch.values()
         finally:
             os.chdir(d)
 
     def _connect(self):
         root = self.cvsroot
         conntype = None
         user, host = None, None
         cmd = ['cvs', 'server']
 
         self.ui.status(_("connecting to %s\n") % root)
 
         if root.startswith(":pserver:"):
             root = root[9:]
             m = re.match(r'(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?(.*)',
                          root)
             if m:
                 conntype = "pserver"
                 user, passw, serv, port, root = m.groups()
                 if not user:
                     user = "anonymous"
                 if not port:
                     port = 2401
                 else:
                     port = int(port)
                 format0 = ":pserver:%s@%s:%s" % (user, serv, root)
                 format1 = ":pserver:%s@%s:%d%s" % (user, serv, port, root)
 
                 if not passw:
                     passw = "A"
                     cvspass = os.path.expanduser("~/.cvspass")
                     try:
                         pf = open(cvspass)
                         for line in pf.read().splitlines():
                             part1, part2 = line.split(' ', 1)
                             if part1 == '/1':
                                 # /1 :pserver:[e-mail]:2401/cvsroot/foo Ah<Z
                                 part1, part2 = part2.split(' ', 1)
                                 format = format1
                             else:
                                 # :pserver:[e-mail]:/cvsroot/foo Ah<Z
                                 format = format0
                             if part1 == format:
                                 passw = part2
                                 break
                         pf.close()
                     except IOError, inst:
                         if inst.errno != errno.ENOENT:
                             if not getattr(inst, 'filename', None):
                                 inst.filename = cvspass
                             raise
 
                 sck = socket.socket()
                 sck.connect((serv, port))
                 sck.send("\n".join(["BEGIN AUTH REQUEST", root, user, passw,
                                     "END AUTH REQUEST", ""]))
                 if sck.recv(128) != "I LOVE YOU\n":
                     raise util.Abort(_("CVS pserver authentication failed"))
 
                 self.writep = self.readp = sck.makefile('r+')
 
         if not conntype and root.startswith(":local:"):
             conntype = "local"
             root = root[7:]
 
         if not conntype:
             # :ext:user@host/home/user/path/to/cvsroot
             if root.startswith(":ext:"):
                 root = root[5:]
             m = re.match(r'(?:([^@:/]+)@)?([^:/]+):?(.*)', root)
             # Do not take Windows path "c:\foo\bar" for a connection strings
             if os.path.isdir(root) or not m:
                 conntype = "local"
             else:
                 conntype = "rsh"
                 user, host, root = m.group(1), m.group(2), m.group(3)
 
         if conntype != "pserver":
             if conntype == "rsh":
                 rsh = os.environ.get("CVS_RSH") or "ssh"
                 if user:
                     cmd = [rsh, '-l', user, host] + cmd
                 else:
                     cmd = [rsh, host] + cmd
 
             # popen2 does not support argument lists under Windows
             cmd = [util.shellquote(arg) for arg in cmd]
             cmd = util.quotecommand(' '.join(cmd))
             self.writep, self.readp = util.popen2(cmd, 'b')
 
         self.realroot = root
 
         self.writep.write("Root %s\n" % root)
         self.writep.write("Valid-responses ok error Valid-requests Mode"
                           " M Mbinary E Checked-in Created Updated"
                           " Merged Removed\n")
         self.writep.write("valid-requests\n")
         self.writep.flush()
         r = self.readp.readline()
         if not r.startswith("Valid-requests"):
             raise util.Abort(_("server sucks"))
         if "UseUnchanged" in r:
             self.writep.write("UseUnchanged\n")
             self.writep.flush()
             r = self.readp.readline()
 
     def getheads(self):
         self._parse()
         return self.heads
 
     def _getfile(self, name, rev):
 
         def chunkedread(fp, count):
             # file-objects returned by socked.makefile() do not handle
             # large read() requests very well.
             chunksize = 65536
             output = StringIO()
             while count > 0:
                 data = fp.read(min(count, chunksize))
                 if not data:
                     raise util.Abort(_("%d bytes missing from remote file") % count)
                 count -= len(data)
                 output.write(data)
             return output.getvalue()
 
         if rev.endswith("(DEAD)"):
             raise IOError
 
         args = ("-N -P -kk -r %s --" % rev).split()
         args.append(self.cvsrepo + '/' + name)
         for x in args:
             self.writep.write("Argument %s\n" % x)
         self.writep.write("Directory .\n%s\nco\n" % self.realroot)
         self.writep.flush()
 
         data = ""
         while 1:
             line = self.readp.readline()
             if line.startswith("Created ") or line.startswith("Updated "):
                 self.readp.readline() # path
                 self.readp.readline() # entries
                 mode = self.readp.readline()[:-1]
                 count = int(self.readp.readline()[:-1])
                 data = chunkedread(self.readp, count)
             elif line.startswith(" "):
                 data += line[1:]
             elif line.startswith("M "):
                 pass
             elif line.startswith("Mbinary "):
                 count = int(self.readp.readline()[:-1])
                 data = chunkedread(self.readp, count)
             else:
                 if line == "ok\n":
                     return (data, "x" in mode and "x" or "")
                 elif line.startswith("E "):
                     self.ui.warn(_("cvs server: %s\n") % line[2:])
                 elif line.startswith("Remove"):
                     self.readp.readline()
                 else:
                     raise util.Abort(_("unknown CVS response: %s") % line)
 
     def getfile(self, file, rev):
         self._parse()
         data, mode = self._getfile(file, rev)
         self.modecache[(file, rev)] = mode
         return data
 
     def getmode(self, file, rev):
         return self.modecache[(file, rev)]
 
     def getchanges(self, rev):
         self._parse()
         self.modecache = {}
         return util.sort(self.files[rev].items()), {}
 
     def getcommit(self, rev):
         self._parse()
         return self.changeset[rev]
 
     def gettags(self):
         self._parse()
         return self.tags
 
     def getchangedfiles(self, rev, i):
         self._parse()
         return util.sort(self.files[rev].keys())

tests/test-convert-cvs-branch

@@ -1,61 +1,62 b''
 #!/bin/sh
 
 # This is http://www.selenic.com/mercurial/bts/issue1148
 
 "$TESTDIR/hghave" cvs || exit 80
 
 cvscall()
 {
     cvs -f "$@"
 }
 
 echo "[extensions]" >> $HGRCPATH
 echo "convert = " >> $HGRCPATH
 echo "graphlog = " >> $HGRCPATH
 echo "[convert]" >> $HGRCPATH
 echo "cvsps=builtin" >> $HGRCPATH
+echo "cvsps.cache=0" >> $HGRCPATH
 
 echo % create cvs repository
 mkdir cvsrepo
 cd cvsrepo
 export CVSROOT=`pwd`
 export CVS_OPTIONS=-f
 cd ..
 
 cvscall -q -d "$CVSROOT" init
 
 echo % Create a new project
 
 mkdir src
 cd src
 echo "1" > a
 echo "1" > b
 cvscall import -m "init" src v0 r0 | sort
 cd ..
 cvscall co src
 cd src
 
 echo % Branch the project
 
 cvscall tag -b BRANCH
 cvscall up -r BRANCH > /dev/null
 
 echo % Modify file a, then b, then a 
 
 echo "2" > a
 cvscall ci -m "mod a" | grep '<--' | sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
 
 echo "2" > b
 cvscall ci -m "mod b" | grep '<--' | sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
 
 echo "3" > a
 cvscall ci -m "mod a again" | grep '<--' | sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
 
 echo % Convert
 
 cd ..
 hg convert src | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
 
 echo % Check the result
 
 hg -R src-hg glog --template '#rev# (#branches#) #desc# files: #files#\n'

tests/test-convert.out

@@ -1,246 +1,249 b''
 hg convert [OPTION]... SOURCE [DEST [REVMAP]]
 
 convert a foreign SCM repository to a Mercurial one.
 
     Accepted source formats [identifiers]:
     - Mercurial [hg]
     - CVS [cvs]
     - Darcs [darcs]
     - git [git]
     - Subversion [svn]
     - Monotone [mtn]
     - GNU Arch [gnuarch]
     - Bazaar [bzr]
     - Perforce [p4]
 
     Accepted destination formats [identifiers]:
     - Mercurial [hg]
     - Subversion [svn] (history on branches is not preserved)
 
     If no revision is given, all revisions will be converted.
     Otherwise, convert will only import up to the named revision
     (given in a format understood by the source).
 
     If no destination directory name is specified, it defaults to the
     basename of the source with '-hg' appended. If the destination
     repository doesn't exist, it will be created.
 
     If <REVMAP> isn't given, it will be put in a default location
     (<dest>/.hg/shamap by default). The <REVMAP> is a simple text file
     that maps each source commit ID to the destination ID for that
     revision, like so:
     <source ID> <destination ID>
 
     If the file doesn't exist, it's automatically created. It's
     updated on each commit copied, so convert-repo can be interrupted
     and can be run repeatedly to copy new commits.
 
     The [username mapping] file is a simple text file that maps each
     source commit author to a destination commit author. It is handy
     for source SCMs that use unix logins to identify authors (eg:
     CVS). One line per author mapping and the line format is:
     srcauthor=whatever string you want
 
     The filemap is a file that allows filtering and remapping of files
     and directories. Comment lines start with '#'. Each line can
     contain one of the following directives:
 
       include path/to/file
 
       exclude path/to/file
 
       rename from/file to/file
 
     The 'include' directive causes a file, or all files under a
     directory, to be included in the destination repository, and the
     exclusion of all other files and directories not explicitely included.
     The 'exclude' directive causes files or directories to be omitted.
     The 'rename' directive renames a file or directory. To rename from
     a subdirectory into the root of the repository, use '.' as the
     path to rename to.
 
     The splicemap is a file that allows insertion of synthetic
     history, letting you specify the parents of a revision. This is
     useful if you want to e.g. give a Subversion merge two parents, or
     graft two disconnected series of history together. Each entry
     contains a key, followed by a space, followed by one or two
     comma-separated values. The key is the revision ID in the source
     revision control system whose parents should be modified (same
     format as a key in .hg/shamap). The values are the revision IDs
     (in either the source or destination revision control system) that
     should be used as the new parents for that node.
 
     Mercurial Source
     -----------------
 
     --config convert.hg.ignoreerrors=False    (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial
         repositories with missing revlogs, by converting from and to
         Mercurial.
     --config convert.hg.saverev=False         (boolean)
         store original revision ID in changeset (forces target IDs to
         change)
     --config convert.hg.startrev=0            (hg revision identifier)
         convert start revision and its descendants
 
     CVS Source
     ----------
 
     CVS source will use a sandbox (i.e. a checked-out copy) from CVS
     to indicate the starting point of what will be converted. Direct
     access to the repository files is not needed, unless of course the
     repository is :local:. The conversion uses the top level directory
     in the sandbox to find the CVS repository, and then uses CVS rlog
     commands to find files to convert. This means that unless a
     filemap is given, all files under the starting directory will be
     converted, and that any directory reorganisation in the CVS
     sandbox is ignored.
 
     Because CVS does not have changesets, it is necessary to collect
     individual commits to CVS and merge them into changesets. CVS
     source uses its internal changeset merging code by default but can
     be configured to call the external 'cvsps' program by setting:
         --config convert.cvsps='cvsps -A -u --cvs-direct -q'
     This is a legacy option and may be removed in future.
 
     The options shown are the defaults.
 
     Internal cvsps is selected by setting
         --config convert.cvsps=builtin
     and has a few more configurable options:
+        --config convert.cvsps.cache=True     (boolean)
+            Set to False to disable remote log caching, for testing and 
+            debugging purposes.
         --config convert.cvsps.fuzz=60        (integer)
             Specify the maximum time (in seconds) that is allowed
             between commits with identical user and log message in a
             single changeset. When very large files were checked in as
             part of a changeset then the default may not be long
             enough.
         --config convert.cvsps.mergeto='{{mergetobranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages
             are matched. If a match occurs, then the conversion
             process will insert a dummy revision merging the branch on
             which this log message occurs to the branch indicated in
             the regex.
         --config convert.cvsps.mergefrom='{{mergefrombranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages
             are matched. If a match occurs, then the conversion
             process will add the most recent revision on the branch
             indicated in the regex as the second parent of the
             changeset.
 
     The hgext/convert/cvsps wrapper script allows the builtin
     changeset merging code to be run without doing a conversion. Its
     parameters and output are similar to that of cvsps 2.1.
 
     Subversion Source
     -----------------
 
     Subversion source detects classical trunk/branches/tags layouts.
     By default, the supplied "svn://repo/path/" source URL is
     converted as a single branch. If "svn://repo/path/trunk" exists it
     replaces the default branch. If "svn://repo/path/branches" exists,
     its subdirectories are listed as possible branches. If
     "svn://repo/path/tags" exists, it is looked for tags referencing
     converted branches. Default "trunk", "branches" and "tags" values
     can be overriden with following options. Set them to paths
     relative to the source URL, or leave them blank to disable
     autodetection.
 
     --config convert.svn.branches=branches    (directory name)
         specify the directory containing branches
     --config convert.svn.tags=tags            (directory name)
         specify the directory containing tags
     --config convert.svn.trunk=trunk          (directory name)
         specify the name of the trunk branch
 
     Source history can be retrieved starting at a specific revision,
     instead of being integrally converted. Only single branch
     conversions are supported.
 
     --config convert.svn.startrev=0           (svn revision number)
         specify start Subversion revision.
 
     Perforce Source
     ---------------
 
     The Perforce (P4) importer can be given a p4 depot path or a
     client specification as source. It will convert all files in the
     source to a flat Mercurial repository, ignoring labels, branches
     and integrations. Note that when a depot path is given you then
     usually should specify a target directory, because otherwise the
     target may be named ...-hg.
 
     It is possible to limit the amount of source history to be
     converted by specifying an initial Perforce revision.
 
     --config convert.p4.startrev=0            (perforce changelist number)
         specify initial Perforce revision.
 
 
     Mercurial Destination
     ---------------------
 
     --config convert.hg.clonebranches=False   (boolean)
         dispatch source branches in separate clones.
     --config convert.hg.tagsbranch=default    (branch name)
         tag revisions branch name
     --config convert.hg.usebranchnames=True   (boolean)
         preserve branch names
 
 options:
 
  -A --authors      username mapping filename
  -d --dest-type    destination repository type
     --filemap      remap file names using contents of file
  -r --rev          import up to target revision REV
  -s --source-type  source repository type
     --splicemap    splice synthesized history into place
     --datesort     try to sort changesets by date
 
 use "hg -v help convert" to show global options
 adding a
 assuming destination a-hg
 initializing destination a-hg repository
 scanning source...
 sorting...
 converting...
 4 a
 3 b
 2 c
 1 d
 0 e
 pulling from ../a
 searching for changes
 no changes found
 % should fail
 initializing destination bogusfile repository
 abort: cannot create new bundle repository
 % should fail
 abort: Permission denied: bogusdir
 % should succeed
 initializing destination bogusdir repository
 scanning source...
 sorting...
 converting...
 4 a
 3 b
 2 c
 1 d
 0 e
 % test pre and post conversion actions
 run hg source pre-conversion action
 run hg sink pre-conversion action
 run hg sink post-conversion action
 run hg source post-conversion action
 % converting empty dir should fail nicely
 assuming destination emptydir-hg
 initializing destination emptydir-hg repository
 emptydir does not look like a CVS checkout
 emptydir does not look like a Git repo
 emptydir does not look like a Subversion repo
 emptydir is not a local Mercurial repo
 emptydir does not look like a darcs repo
 emptydir does not look like a monotone repo
 emptydir does not look like a GNU Arch repo
 emptydir does not look like a Bazaar repo
 emptydir does not look like a P4 repo
 abort: emptydir: missing or unsupported repository