Add hg-to-git conversion utility.
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@popies.net> Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Stelian Pop
Junio C Hamano
parent
3fb624521e
commit
98d47d4ccf
@ -86,6 +86,14 @@ Foreign SCM interface
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series in git back and forth.
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- *hg-to-git* (contrib/)
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hg-to-git converts a Mercurial repository into a git one, and
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preserves the full branch history in the process. hg-to-git can
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also be used in an incremental way to keep the git repository
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in sync with the master Mercurial repository.
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Others
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------
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233
contrib/hg-to-git/hg-to-git.py
Executable file
233
contrib/hg-to-git/hg-to-git.py
Executable file
@ -0,0 +1,233 @@
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#! /usr/bin/python
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""" hg-to-svn.py - A Mercurial to GIT converter
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Copyright (C)2007 Stelian Pop <stelian@popies.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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"""
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import os, os.path, sys
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import tempfile, popen2, pickle, getopt
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import re
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# Maps hg version -> git version
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hgvers = {}
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# List of children for each hg revision
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hgchildren = {}
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# Current branch for each hg revision
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hgbranch = {}
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#------------------------------------------------------------------------------
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def usage():
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print """\
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%s: [OPTIONS] <hgprj>
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options:
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-s, --gitstate=FILE: name of the state to be saved/read
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for incrementals
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required:
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hgprj: name of the HG project to import (directory)
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""" % sys.argv[0]
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#------------------------------------------------------------------------------
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def getgitenv(user, date):
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env = ''
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elems = re.compile('(.*?)\s+<(.*)>').match(user)
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if elems:
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env += 'export GIT_AUTHOR_NAME="%s" ;' % elems.group(1)
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env += 'export GIT_COMMITER_NAME="%s" ;' % elems.group(1)
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env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2)
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env += 'export GIT_COMMITER_EMAIL="%s" ;' % elems.group(2)
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else:
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env += 'export GIT_AUTHOR_NAME="%s" ;' % user
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env += 'export GIT_COMMITER_NAME="%s" ;' % user
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env += 'export GIT_AUTHOR_EMAIL= ;'
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env += 'export GIT_COMMITER_EMAIL= ;'
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env += 'export GIT_AUTHOR_DATE="%s" ;' % date
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env += 'export GIT_COMMITTER_DATE="%s" ;' % date
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return env
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#------------------------------------------------------------------------------
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state = ''
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try:
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opts, args = getopt.getopt(sys.argv[1:], 's:t:', ['gitstate=', 'tempdir='])
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for o, a in opts:
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if o in ('-s', '--gitstate'):
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state = a
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state = os.path.abspath(state)
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if len(args) != 1:
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raise('params')
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except:
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usage()
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sys.exit(1)
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hgprj = args[0]
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os.chdir(hgprj)
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if state:
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if os.path.exists(state):
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print 'State does exist, reading'
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f = open(state, 'r')
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hgvers = pickle.load(f)
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else:
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print 'State does not exist, first run'
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tip = os.popen('hg tip | head -1 | cut -f 2 -d :').read().strip()
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print 'tip is', tip
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# Calculate the branches
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print 'analysing the branches...'
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hgchildren["0"] = ()
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hgbranch["0"] = "master"
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for cset in range(1, int(tip) + 1):
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hgchildren[str(cset)] = ()
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prnts = os.popen('hg log -r %d | grep ^parent: | cut -f 2 -d :' % cset).readlines()
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if len(prnts) > 0:
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parent = prnts[0].strip()
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else:
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parent = str(cset - 1)
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hgchildren[parent] += ( str(cset), )
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if len(prnts) > 1:
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mparent = prnts[1].strip()
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hgchildren[mparent] += ( str(cset), )
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else:
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mparent = None
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if mparent:
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# For merge changesets, take either one, preferably the 'master' branch
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if hgbranch[mparent] == 'master':
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hgbranch[str(cset)] = 'master'
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else:
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hgbranch[str(cset)] = hgbranch[parent]
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else:
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# Normal changesets
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# For first children, take the parent branch, for the others create a new branch
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if hgchildren[parent][0] == str(cset):
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hgbranch[str(cset)] = hgbranch[parent]
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else:
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hgbranch[str(cset)] = "branch-" + str(cset)
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if not hgvers.has_key("0"):
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print 'creating repository'
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os.system('git-init-db')
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# loop through every hg changeset
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for cset in range(int(tip) + 1):
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# incremental, already seen
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if hgvers.has_key(str(cset)):
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continue
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# get info
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prnts = os.popen('hg log -r %d | grep ^parent: | cut -f 2 -d :' % cset).readlines()
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if len(prnts) > 0:
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parent = prnts[0].strip()
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else:
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parent = str(cset - 1)
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if len(prnts) > 1:
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mparent = prnts[1].strip()
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else:
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mparent = None
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(fdcomment, filecomment) = tempfile.mkstemp()
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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()
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os.write(fdcomment, csetcomment)
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os.close(fdcomment)
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date = os.popen('hg log -r %d | grep ^date: | cut -f 2- -d :' % cset).read().strip()
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tag = os.popen('hg log -r %d | grep ^tag: | cut -f 2- -d :' % cset).read().strip()
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user = os.popen('hg log -r %d | grep ^user: | cut -f 2- -d :' % cset).read().strip()
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print '-----------------------------------------'
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print 'cset:', cset
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print 'branch:', hgbranch[str(cset)]
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print 'user:', user
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print 'date:', date
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print 'comment:', csetcomment
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print 'parent:', parent
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if mparent:
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print 'mparent:', mparent
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if tag:
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print 'tag:', tag
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print '-----------------------------------------'
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# checkout the parent if necessary
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if cset != 0:
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if hgbranch[str(cset)] == "branch-" + str(cset):
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print 'creating new branch', hgbranch[str(cset)]
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os.system('git-checkout -b %s %s' % (hgbranch[str(cset)], hgvers[parent]))
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else:
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print 'checking out branch', hgbranch[str(cset)]
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os.system('git-checkout %s' % hgbranch[str(cset)])
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# merge
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if mparent:
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if hgbranch[parent] == hgbranch[str(cset)]:
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otherbranch = hgbranch[mparent]
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else:
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otherbranch = hgbranch[parent]
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print 'merging', otherbranch, 'into', hgbranch[str(cset)]
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os.system(getgitenv(user, date) + 'git-merge --no-commit -s ours "" %s %s' % (hgbranch[str(cset)], otherbranch))
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# remove everything except .git and .hg directories
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os.system('find . \( -path "./.hg" -o -path "./.git" \) -prune -o ! -name "." -print | xargs rm -rf')
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# repopulate with checkouted files
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os.system('hg update -C %d' % cset)
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# add new files
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os.system('git-ls-files -x .hg --others | git-update-index --add --stdin')
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# delete removed files
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os.system('git-ls-files -x .hg --deleted | git-update-index --remove --stdin')
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# commit
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os.system(getgitenv(user, date) + 'git-commit -a -F %s' % filecomment)
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os.unlink(filecomment)
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# tag
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if tag and tag != 'tip':
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os.system(getgitenv(user, date) + 'git-tag %s' % tag)
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# delete branch if not used anymore...
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if mparent and len(hgchildren[str(cset)]):
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print "Deleting unused branch:", otherbranch
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os.system('git-branch -d %s' % otherbranch)
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# retrieve and record the version
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vvv = os.popen('git-show | head -1').read()
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vvv = vvv[vvv.index(' ') + 1 : ].strip()
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print 'record', cset, '->', vvv
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hgvers[str(cset)] = vvv
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os.system('git-repack -a -d')
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# write the state for incrementals
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if state:
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print 'Writing state'
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f = open(state, 'w')
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pickle.dump(hgvers, f)
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# vim: et ts=8 sw=4 sts=4
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21
contrib/hg-to-git/hg-to-git.txt
Normal file
21
contrib/hg-to-git/hg-to-git.txt
Normal file
@ -0,0 +1,21 @@
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hg-to-git.py is able to convert a Mercurial repository into a git one,
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and preserves the branches in the process (unlike tailor)
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hg-to-git.py can probably be greatly improved (it's a rather crude
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combination of shell and python) but it does already work quite well for
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me. Features:
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- supports incremental conversion
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(for keeping a git repo in sync with a hg one)
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- supports hg branches
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- converts hg tags
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Note that the git repository will be created 'in place' (at the same
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location as the source hg repo). You will have to manually remove the
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'.hg' directory after the conversion.
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Also note that the incremental conversion uses 'simple' hg changesets
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identifiers (ordinals, as opposed to SHA-1 ids), and since these ids
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are not stable across different repositories the hg-to-git.py state file
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is forever tied to one hg repository.
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Stelian Pop <stelian@popies.net>
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