#!/usr/bin/env python """ hg-to-git.py - A Mercurial to GIT converter Copyright (C)2007 Stelian Pop 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, pickle, getopt import re # Maps hg version -> git version hgvers = {} # List of children for each hg revision hgchildren = {} # List of parents for each hg revision hgparents = {} # Current branch for each hg revision hgbranch = {} # Number of new changesets converted from hg hgnewcsets = 0 #------------------------------------------------------------------------------ def usage(): print """\ %s: [OPTIONS] options: -s, --gitstate=FILE: name of the state to be saved/read for incrementals -n, --nrepack=INT: number of changesets that will trigger a repack (default=0, -1 to deactivate) -v, --verbose: be verbose 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_COMMITTER_NAME="%s" ;' % elems.group(1) env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2) env += 'export GIT_COMMITTER_EMAIL="%s" ;' % elems.group(2) else: env += 'export GIT_AUTHOR_NAME="%s" ;' % user env += 'export GIT_COMMITTER_NAME="%s" ;' % user env += 'export GIT_AUTHOR_EMAIL= ;' env += 'export GIT_COMMITTER_EMAIL= ;' env += 'export GIT_AUTHOR_DATE="%s" ;' % date env += 'export GIT_COMMITTER_DATE="%s" ;' % date return env #------------------------------------------------------------------------------ state = '' opt_nrepack = 0 verbose = False try: opts, args = getopt.getopt(sys.argv[1:], 's:t:n:v', ['gitstate=', 'tempdir=', 'nrepack=', 'verbose']) for o, a in opts: if o in ('-s', '--gitstate'): state = a state = os.path.abspath(state) if o in ('-n', '--nrepack'): opt_nrepack = int(a) if o in ('-v', '--verbose'): verbose = True if len(args) != 1: raise Exception('params') except: usage() sys.exit(1) hgprj = args[0] os.chdir(hgprj) if state: if os.path.exists(state): if verbose: print 'State does exist, reading' f = open(state, 'r') hgvers = pickle.load(f) else: print 'State does not exist, first run' sock = os.popen('hg tip --template "{rev}"') tip = sock.read() if sock.close(): sys.exit(1) if verbose: print 'tip is', tip # Calculate the branches if verbose: print 'analysing the branches...' hgchildren["0"] = () hgparents["0"] = (None, None) hgbranch["0"] = "master" for cset in range(1, int(tip) + 1): hgchildren[str(cset)] = () prnts = os.popen('hg log -r %d --template "{parents}"' % cset).read().strip().split(' ') prnts = map(lambda x: x[:x.find(':')], prnts) if 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 hgparents[str(cset)] = (parent, mparent) 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') # loop through every hg changeset for cset in range(int(tip) + 1): # incremental, already seen if hgvers.has_key(str(cset)): continue hgnewcsets += 1 # get info log_data = os.popen('hg log -r %d --template "{tags}\n{date|date}\n{author}\n"' % cset).readlines() tag = log_data[0].strip() date = log_data[1].strip() user = log_data[2].strip() parent = hgparents[str(cset)][0] mparent = hgparents[str(cset)][1] #get comment (fdcomment, filecomment) = tempfile.mkstemp() csetcomment = os.popen('hg log -r %d --template "{desc}"' % cset).read().strip() os.write(fdcomment, csetcomment) os.close(fdcomment) print '-----------------------------------------' print 'cset:', cset print 'branch:', hgbranch[str(cset)] print 'user:', user print 'date:', date print 'comment:', csetcomment if parent: 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 --allow-empty -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 --quiet --pretty=format:%H').read() print 'record', cset, '->', vvv hgvers[str(cset)] = vvv if hgnewcsets >= opt_nrepack and opt_nrepack != -1: os.system('git repack -a -d') # write the state for incrementals if state: if verbose: print 'Writing state' f = open(state, 'w') pickle.dump(hgvers, f) # vim: et ts=8 sw=4 sts=4