about summary refs log tree commit diff
path: root/contrib/hg-to-git/hg-to-git.py
blob: 7eb1b24cc7a15876cc8de29f248dd50db465c80e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
#!/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, see <http://www.gnu.org/licenses/>.
"""

import os, os.path, sys
import tempfile, pickle, getopt
import re

if sys.hexversion < 0x02030000:
   # The behavior of the pickle module changed significantly in 2.3
   sys.stderr.write("hg-to-git.py: requires Python 2.3 or later.\n")
   sys.exit(1)

# 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 "0" not in hgvers:
    print('creating repository')
    os.system('git init')

# loop through every hg changeset
for cset in range(int(tip) + 1):

    # incremental, already seen
    if str(cset) in hgvers:
        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 --allow-empty-message -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