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, popen2, pickle, getopt
26 # Maps hg version -> git version
28 # List of children for each hg revision
30 # List of parents for each hg revision
32 # Current branch for each hg revision
34 # Number of new changesets converted from hg
37 #------------------------------------------------------------------------------
45 -s, --gitstate=FILE: name of the state to be saved/read
47 -n, --nrepack=INT: number of changesets that will trigger
48 a repack (default=0, -1 to deactivate)
51 hgprj: name of the HG project to import (directory)
54 #------------------------------------------------------------------------------
56 def getgitenv(user, date):
58 elems = re.compile('(.*?)\s+<(.*)>').match(user)
60 env += 'export GIT_AUTHOR_NAME="%s" ;' % elems.group(1)
61 env += 'export GIT_COMMITER_NAME="%s" ;' % elems.group(1)
62 env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2)
63 env += 'export GIT_COMMITER_EMAIL="%s" ;' % elems.group(2)
65 env += 'export GIT_AUTHOR_NAME="%s" ;' % user
66 env += 'export GIT_COMMITER_NAME="%s" ;' % user
67 env += 'export GIT_AUTHOR_EMAIL= ;'
68 env += 'export GIT_COMMITER_EMAIL= ;'
70 env += 'export GIT_AUTHOR_DATE="%s" ;' % date
71 env += 'export GIT_COMMITTER_DATE="%s" ;' % date
74 #------------------------------------------------------------------------------
80 opts, args = getopt.getopt(sys.argv[1:], 's:t:n:', ['gitstate=', 'tempdir=', 'nrepack='])
82 if o in ('-s', '--gitstate'):
84 state = os.path.abspath(state)
85 if o in ('-n', '--nrepack'):
97 if os.path.exists(state):
98 print 'State does exist, reading'
100 hgvers = pickle.load(f)
102 print 'State does not exist, first run'
104 tip = os.popen('hg tip --template "{rev}"').read()
107 # Calculate the branches
108 print 'analysing the branches...'
110 hgparents["0"] = (None, None)
111 hgbranch["0"] = "master"
112 for cset in range(1, int(tip) + 1):
113 hgchildren[str(cset)] = ()
114 prnts = os.popen('hg log -r %d --template "{parents}"' % cset).read().strip().split(' ')
115 prnts = map(lambda x: x[:x.find(':')], prnts)
117 parent = prnts[0].strip()
119 parent = str(cset - 1)
120 hgchildren[parent] += ( str(cset), )
122 mparent = prnts[1].strip()
123 hgchildren[mparent] += ( str(cset), )
127 hgparents[str(cset)] = (parent, mparent)
130 # For merge changesets, take either one, preferably the 'master' branch
131 if hgbranch[mparent] == 'master':
132 hgbranch[str(cset)] = 'master'
134 hgbranch[str(cset)] = hgbranch[parent]
137 # For first children, take the parent branch, for the others create a new branch
138 if hgchildren[parent][0] == str(cset):
139 hgbranch[str(cset)] = hgbranch[parent]
141 hgbranch[str(cset)] = "branch-" + str(cset)
143 if not hgvers.has_key("0"):
144 print 'creating repository'
145 os.system('git-init-db')
147 # loop through every hg changeset
148 for cset in range(int(tip) + 1):
150 # incremental, already seen
151 if hgvers.has_key(str(cset)):
156 log_data = os.popen('hg log -r %d --template "{tags}\n{date|date}\n{author}\n"' % cset).readlines()
157 tag = log_data[0].strip()
158 date = log_data[1].strip()
159 user = log_data[2].strip()
160 parent = hgparents[str(cset)][0]
161 mparent = hgparents[str(cset)][1]
164 (fdcomment, filecomment) = tempfile.mkstemp()
165 csetcomment = os.popen('hg log -r %d --template "{desc}"' % cset).read().strip()
166 os.write(fdcomment, csetcomment)
169 print '-----------------------------------------'
171 print 'branch:', hgbranch[str(cset)]
174 print 'comment:', csetcomment
176 print 'parent:', parent
178 print 'mparent:', mparent
181 print '-----------------------------------------'
183 # checkout the parent if necessary
185 if hgbranch[str(cset)] == "branch-" + str(cset):
186 print 'creating new branch', hgbranch[str(cset)]
187 os.system('git-checkout -b %s %s' % (hgbranch[str(cset)], hgvers[parent]))
189 print 'checking out branch', hgbranch[str(cset)]
190 os.system('git-checkout %s' % hgbranch[str(cset)])
194 if hgbranch[parent] == hgbranch[str(cset)]:
195 otherbranch = hgbranch[mparent]
197 otherbranch = hgbranch[parent]
198 print 'merging', otherbranch, 'into', hgbranch[str(cset)]
199 os.system(getgitenv(user, date) + 'git-merge --no-commit -s ours "" %s %s' % (hgbranch[str(cset)], otherbranch))
201 # remove everything except .git and .hg directories
202 os.system('find . \( -path "./.hg" -o -path "./.git" \) -prune -o ! -name "." -print | xargs rm -rf')
204 # repopulate with checkouted files
205 os.system('hg update -C %d' % cset)
208 os.system('git-ls-files -x .hg --others | git-update-index --add --stdin')
209 # delete removed files
210 os.system('git-ls-files -x .hg --deleted | git-update-index --remove --stdin')
213 os.system(getgitenv(user, date) + 'git commit --allow-empty -a -F %s' % filecomment)
214 os.unlink(filecomment)
217 if tag and tag != 'tip':
218 os.system(getgitenv(user, date) + 'git-tag %s' % tag)
220 # delete branch if not used anymore...
221 if mparent and len(hgchildren[str(cset)]):
222 print "Deleting unused branch:", otherbranch
223 os.system('git-branch -d %s' % otherbranch)
225 # retrieve and record the version
226 vvv = os.popen('git-show --quiet --pretty=format:%H').read()
227 print 'record', cset, '->', vvv
228 hgvers[str(cset)] = vvv
230 if hgnewcsets >= opt_nrepack and opt_nrepack != -1:
231 os.system('git-repack -a -d')
233 # write the state for incrementals
235 print 'Writing state'
237 pickle.dump(hgvers, f)
239 # vim: et ts=8 sw=4 sts=4