3 """ hg-to-git.py - A Mercurial to GIT converter
5 Copyright (C)2007 Stelian Pop <stelian@popies.net>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 import os, os.path, sys
23 import tempfile, pickle, getopt
26 if sys.hexversion < 0x02030000:
27 # The behavior of the pickle module changed significantly in 2.3
28 sys.stderr.write("hg-to-git.py: requires Python 2.3 or later.\n")
31 # Maps hg version -> git version
33 # List of children for each hg revision
35 # List of parents for each hg revision
37 # Current branch for each hg revision
39 # Number of new changesets converted from hg
42 #------------------------------------------------------------------------------
50 -s, --gitstate=FILE: name of the state to be saved/read
52 -n, --nrepack=INT: number of changesets that will trigger
53 a repack (default=0, -1 to deactivate)
54 -v, --verbose: be verbose
57 hgprj: name of the HG project to import (directory)
60 #------------------------------------------------------------------------------
62 def getgitenv(user, date):
64 elems = re.compile('(.*?)\s+<(.*)>').match(user)
66 env += 'export GIT_AUTHOR_NAME="%s" ;' % elems.group(1)
67 env += 'export GIT_COMMITTER_NAME="%s" ;' % elems.group(1)
68 env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2)
69 env += 'export GIT_COMMITTER_EMAIL="%s" ;' % elems.group(2)
71 env += 'export GIT_AUTHOR_NAME="%s" ;' % user
72 env += 'export GIT_COMMITTER_NAME="%s" ;' % user
73 env += 'export GIT_AUTHOR_EMAIL= ;'
74 env += 'export GIT_COMMITTER_EMAIL= ;'
76 env += 'export GIT_AUTHOR_DATE="%s" ;' % date
77 env += 'export GIT_COMMITTER_DATE="%s" ;' % date
80 #------------------------------------------------------------------------------
87 opts, args = getopt.getopt(sys.argv[1:], 's:t:n:v', ['gitstate=', 'tempdir=', 'nrepack=', 'verbose'])
89 if o in ('-s', '--gitstate'):
91 state = os.path.abspath(state)
92 if o in ('-n', '--nrepack'):
94 if o in ('-v', '--verbose'):
97 raise Exception('params')
106 if os.path.exists(state):
108 print 'State does exist, reading'
110 hgvers = pickle.load(f)
112 print 'State does not exist, first run'
114 sock = os.popen('hg tip --template "{rev}"')
121 # Calculate the branches
123 print 'analysing the branches...'
125 hgparents["0"] = (None, None)
126 hgbranch["0"] = "master"
127 for cset in range(1, int(tip) + 1):
128 hgchildren[str(cset)] = ()
129 prnts = os.popen('hg log -r %d --template "{parents}"' % cset).read().strip().split(' ')
130 prnts = map(lambda x: x[:x.find(':')], prnts)
132 parent = prnts[0].strip()
134 parent = str(cset - 1)
135 hgchildren[parent] += ( str(cset), )
137 mparent = prnts[1].strip()
138 hgchildren[mparent] += ( str(cset), )
142 hgparents[str(cset)] = (parent, mparent)
145 # For merge changesets, take either one, preferably the 'master' branch
146 if hgbranch[mparent] == 'master':
147 hgbranch[str(cset)] = 'master'
149 hgbranch[str(cset)] = hgbranch[parent]
152 # For first children, take the parent branch, for the others create a new branch
153 if hgchildren[parent][0] == str(cset):
154 hgbranch[str(cset)] = hgbranch[parent]
156 hgbranch[str(cset)] = "branch-" + str(cset)
158 if not hgvers.has_key("0"):
159 print 'creating repository'
160 os.system('git init')
162 # loop through every hg changeset
163 for cset in range(int(tip) + 1):
165 # incremental, already seen
166 if hgvers.has_key(str(cset)):
171 log_data = os.popen('hg log -r %d --template "{tags}\n{date|date}\n{author}\n"' % cset).readlines()
172 tag = log_data[0].strip()
173 date = log_data[1].strip()
174 user = log_data[2].strip()
175 parent = hgparents[str(cset)][0]
176 mparent = hgparents[str(cset)][1]
179 (fdcomment, filecomment) = tempfile.mkstemp()
180 csetcomment = os.popen('hg log -r %d --template "{desc}"' % cset).read().strip()
181 os.write(fdcomment, csetcomment)
184 print '-----------------------------------------'
186 print 'branch:', hgbranch[str(cset)]
189 print 'comment:', csetcomment
191 print 'parent:', parent
193 print 'mparent:', mparent
196 print '-----------------------------------------'
198 # checkout the parent if necessary
200 if hgbranch[str(cset)] == "branch-" + str(cset):
201 print 'creating new branch', hgbranch[str(cset)]
202 os.system('git checkout -b %s %s' % (hgbranch[str(cset)], hgvers[parent]))
204 print 'checking out branch', hgbranch[str(cset)]
205 os.system('git checkout %s' % hgbranch[str(cset)])
209 if hgbranch[parent] == hgbranch[str(cset)]:
210 otherbranch = hgbranch[mparent]
212 otherbranch = hgbranch[parent]
213 print 'merging', otherbranch, 'into', hgbranch[str(cset)]
214 os.system(getgitenv(user, date) + 'git merge --no-commit -s ours "" %s %s' % (hgbranch[str(cset)], otherbranch))
216 # remove everything except .git and .hg directories
217 os.system('find . \( -path "./.hg" -o -path "./.git" \) -prune -o ! -name "." -print | xargs rm -rf')
219 # repopulate with checkouted files
220 os.system('hg update -C %d' % cset)
223 os.system('git ls-files -x .hg --others | git update-index --add --stdin')
224 # delete removed files
225 os.system('git ls-files -x .hg --deleted | git update-index --remove --stdin')
228 os.system(getgitenv(user, date) + 'git commit --allow-empty --allow-empty-message -a -F %s' % filecomment)
229 os.unlink(filecomment)
232 if tag and tag != 'tip':
233 os.system(getgitenv(user, date) + 'git tag %s' % tag)
235 # delete branch if not used anymore...
236 if mparent and len(hgchildren[str(cset)]):
237 print "Deleting unused branch:", otherbranch
238 os.system('git branch -d %s' % otherbranch)
240 # retrieve and record the version
241 vvv = os.popen('git show --quiet --pretty=format:%H').read()
242 print 'record', cset, '->', vvv
243 hgvers[str(cset)] = vvv
245 if hgnewcsets >= opt_nrepack and opt_nrepack != -1:
246 os.system('git repack -a -d')
248 # write the state for incrementals
251 print 'Writing state'
253 pickle.dump(hgvers, f)
255 # vim: et ts=8 sw=4 sts=4