git/contrib/hg-to-git/hg-to-git.py
R. Tyler Ballance 44211e8c2e Correct references to /usr/bin/python which does not exist on FreeBSD
On FreeBSD, Python does not ship as part of the base system but is available
via the ports system, which install the binary in /usr/local/bin.

Signed-off-by: R. Tyler Ballance <tyler@monkeypox.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-03-24 14:33:54 -07:00

250 lines
7.7 KiB
Python
Executable file

#!/usr/bin/env python
""" hg-to-git.py - A Mercurial to GIT converter
Copyright (C)2007 Stelian Pop <stelian@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, 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] <hgprj>
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