hg-to-git.py is able to convert a Mercurial repository into a git one,
and preserves the branches in the process (unlike tailor)
hg-to-git.py can probably be greatly improved (it's a rather crude
combination of shell and python) but it does already work quite well for
me. Features:
- supports incremental conversion
(for keeping a git repo in sync with a hg one)
- supports hg branches
- converts hg tags
Signed-off-by: Stelian Pop <stelian@xxxxxxxxxx>
---
Documentation/git-tools.txt | 7 +
contrib/hg-to-git/hg-to-git.py | 233 +++++++++++++++++++++++++++++++++++++++
contrib/hg-to-git/hg-to-git.txt | 22 ++++
3 files changed, 262 insertions(+), 0 deletions(-)
diff --git a/Documentation/git-tools.txt b/Documentation/git-tools.txt
index 0914cbb..4d245d5 100644
--- a/Documentation/git-tools.txt
+++ b/Documentation/git-tools.txt
@@ -68,6 +68,13 @@ History Viewers
Foreign SCM interface
---------------------
+ - *hg-to-git* (contrib/)
+
+ hg-to-git converts a Mercurial repository into a git one, and
+ preserves the full branch history in the process. hg-to-git can
+ also be used in an incremental way to keep the git repository
+ in sync with the master Mercurial repository.
+
- *git-svn* (contrib/)
git-svn is a simple conduit for changesets between a single Subversion
diff --git a/contrib/hg-to-git/hg-to-git.py b/contrib/hg-to-git/hg-to-git.py
new file mode 100755
index 0000000..37337ff
--- /dev/null
+++ b/contrib/hg-to-git/hg-to-git.py
@@ -0,0 +1,233 @@
+#! /usr/bin/python
+
+""" hg-to-svn.py - A Mercurial to GIT converter
+
+ Copyright (C)2007 Stelian Pop <stelian@xxxxxxxxxx>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+"""
+
+import os, os.path, sys
+import tempfile, popen2, pickle, getopt
+import re
+
+# Maps hg version -> git version
+hgvers = {}
+# List of children for each hg revision
+hgchildren = {}
+# Current branch for each hg revision
+hgbranch = {}
+
+#------------------------------------------------------------------------------
+
+def usage():
+
+ print """\
+%s: [OPTIONS] <hgprj>
+
+options:
+ -s, --gitstate=FILE: name of the state to be saved/read
+ for incrementals
+
+required:
+ hgprj: name of the HG project to import (directory)
+""" % sys.argv[0]
+
+#------------------------------------------------------------------------------
+
+def getgitenv(user, date):
+ env = ''
+ elems = re.compile('(.*?)\s+<(.*)>').match(user)
+ if elems:
+ env += 'export GIT_AUTHOR_NAME="%s" ;' % elems.group(1)
+ env += 'export GIT_COMMITER_NAME="%s" ;' % elems.group(1)
+ env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2)
+ env += 'export GIT_COMMITER_EMAIL="%s" ;' % elems.group(2)
+ else:
+ env += 'export GIT_AUTHOR_NAME="%s" ;' % user
+ env += 'export GIT_COMMITER_NAME="%s" ;' % user
+ env += 'export GIT_AUTHOR_EMAIL= ;'
+ env += 'export GIT_COMMITER_EMAIL= ;'
+
+ env += 'export GIT_AUTHOR_DATE="%s" ;' % date
+ env += 'export GIT_COMMITTER_DATE="%s" ;' % date
+ return env
+
+#------------------------------------------------------------------------------
+
+state = ''
+
+try:
+ opts, args = getopt.getopt(sys.argv[1:], 's:t:', ['gitstate=', 'tempdir='])
+ for o, a in opts:
+ if o in ('-s', '--gitstate'):
+ state = a
+ state = os.path.abspath(state)
+
+ if len(args) != 1:
+ raise('params')
+except:
+ usage()
+ sys.exit(1)
+
+hgprj = args[0]
+os.chdir(hgprj)
+
+if state:
+ if os.path.exists(state):
+ print 'State does exist, reading'
+ f = open(state, 'r')
+ hgvers = pickle.load(f)
+ else:
+ print 'State does not exist, first run'
+
+tip = os.popen('hg tip | head -1 | cut -f 2 -d :').read().strip()
+print 'tip is', tip
+
+# Calculate the branches
+print 'analysing the branches...'
+hgchildren["0"] = ()
+hgbranch["0"] = "master"
+for cset in range(1, int(tip) + 1):
+ hgchildren[str(cset)] = ()
+ prnts = os.popen('hg log -r %d | grep ^parent: | cut -f 2 -d :' % cset).readlines()
+ if len(prnts) > 0:
+ parent = prnts[0].strip()
+ else:
+ parent = str(cset - 1)
+ hgchildren[parent] += ( str(cset), )
+ if len(prnts) > 1:
+ mparent = prnts[1].strip()
+ hgchildren[mparent] += ( str(cset), )
+ else:
+ mparent = None
+
+ if mparent:
+ # For merge changesets, take either one, preferably the 'master' branch
+ if hgbranch[mparent] == 'master':
+ hgbranch[str(cset)] = 'master'
+ else:
+ hgbranch[str(cset)] = hgbranch[parent]
+ else:
+ # Normal changesets
+ # For first children, take the parent branch, for the others create a new branch
+ if hgchildren[parent][0] == str(cset):
+ hgbranch[str(cset)] = hgbranch[parent]
+ else:
+ hgbranch[str(cset)] = "branch-" + str(cset)
+
+if not hgvers.has_key("0"):
+ print 'creating repository'
+ os.system('git-init-db')
+
+# loop through every hg changeset
+for cset in range(int(tip) + 1):
+
+ # incremental, already seen
+ if hgvers.has_key(str(cset)):
+ continue
+
+ # get info
+ prnts = os.popen('hg log -r %d | grep ^parent: | cut -f 2 -d :' % cset).readlines()
+ if len(prnts) > 0:
+ parent = prnts[0].strip()
+ else:
+ parent = str(cset - 1)
+ if len(prnts) > 1:
+ mparent = prnts[1].strip()
+ else:
+ mparent = None
+
+ (fdcomment, filecomment) = tempfile.mkstemp()
+ csetcomment = os.popen('hg log -r %d -v | grep -v ^changeset: | grep -v ^parent: | grep -v ^user: | grep -v ^date | grep -v ^files: | grep -v ^description: | grep -v ^tag:' % cset).read().strip()
+ os.write(fdcomment, csetcomment)
+ os.close(fdcomment)
+
+ date = os.popen('hg log -r %d | grep ^date: | cut -f 2- -d :' % cset).read().strip()
+
+ tag = os.popen('hg log -r %d | grep ^tag: | cut -f 2- -d :' % cset).read().strip()
+
+ user = os.popen('hg log -r %d | grep ^user: | cut -f 2- -d :' % cset).read().strip()
+
+ print '-----------------------------------------'
+ print 'cset:', cset
+ print 'branch:', hgbranch[str(cset)]
+ print 'user:', user
+ print 'date:', date
+ print 'comment:', csetcomment
+ print 'parent:', parent
+ if mparent:
+ print 'mparent:', mparent
+ if tag:
+ print 'tag:', tag
+ print '-----------------------------------------'
+
+ # checkout the parent if necessary
+ if cset != 0:
+ if hgbranch[str(cset)] == "branch-" + str(cset):
+ print 'creating new branch', hgbranch[str(cset)]
+ os.system('git-checkout -b %s %s' % (hgbranch[str(cset)], hgvers[parent]))
+ else:
+ print 'checking out branch', hgbranch[str(cset)]
+ os.system('git-checkout %s' % hgbranch[str(cset)])
+
+ # merge
+ if mparent:
+ if hgbranch[parent] == hgbranch[str(cset)]:
+ otherbranch = hgbranch[mparent]
+ else:
+ otherbranch = hgbranch[parent]
+ print 'merging', otherbranch, 'into', hgbranch[str(cset)]
+ os.system(getgitenv(user, date) + 'git-merge --no-commit -s ours "" %s %s' % (hgbranch[str(cset)], otherbranch))
+
+ # remove everything except .git and .hg directories
+ os.system('find . \( -path "./.hg" -o -path "./.git" \) -prune -o ! -name "." -print | xargs rm -rf')
+
+ # repopulate with checkouted files
+ os.system('hg update -C %d' % cset)
+
+ # add new files
+ os.system('git-ls-files -x .hg --others | git-update-index --add --stdin')
+ # delete removed files
+ os.system('git-ls-files -x .hg --deleted | git-update-index --remove --stdin')
+
+ # commit
+ os.system(getgitenv(user, date) + 'git-commit -a -F %s' % filecomment)
+ os.unlink(filecomment)
+
+ # tag
+ if tag and tag != 'tip':
+ os.system(getgitenv(user, date) + 'git-tag %s' % tag)
+
+ # delete branch if not used anymore...
+ if mparent and len(hgchildren[str(cset)]):
+ print "Deleting unused branch:", otherbranch
+ os.system('git-branch -d %s' % otherbranch)
+
+ # retrieve and record the version
+ vvv = os.popen('git-show | head -1').read()
+ vvv = vvv[vvv.index(' ') + 1 : ].strip()
+ print 'record', cset, '->', vvv
+ hgvers[str(cset)] = vvv
+
+os.system('git-repack -a -d')
+
+# write the state for incrementals
+if state:
+ print 'Writing state'
+ f = open(state, 'w')
+ pickle.dump(hgvers, f)
+
+# vim: et ts=8 sw=4 sts=4
diff --git a/contrib/hg-to-git/hg-to-git.txt b/contrib/hg-to-git/hg-to-git.txt
new file mode 100644
index 0000000..cf1c735
--- /dev/null
+++ b/contrib/hg-to-git/hg-to-git.txt
@@ -0,0 +1,22 @@
+hg-to-git.py is able to convert a Mercurial repository into a git one,
+and preserves the branches in the process (unlike tailor)
+
+hg-to-git.py can probably be greatly improved (it's a rather crude
+combination of shell and python) but it does already work quite well for
+me. Features:
+ - supports incremental conversion
+ (for keeping a git repo in sync with a hg one)
+ - supports hg branches
+ - converts hg tags
+
+Note that the git repository will be created 'in place' (at the same
+location as the source hg repo). You will have to manually remove the
+'.hg' directory after the conversion.
+
+Also note that the incremental conversion uses 'simple' hg changesets
+identifiers (ordinals, as opposed to SHA-1 ids), and since these ids
+are not stable across different repositories the hg-to-git.py state file
+is forever tied to one hg repository.
+
+--
+Stelian Pop <stelian@xxxxxxxxxx>
--
1.4.4.4
-
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