A Mercurial to GIT converter

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#! /usr/bin/python
""" hg-to-svn.py - A Mercurial to GIT converter
Copyright (C)2007 Stelian Pop <stelian <at> popies.net>
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