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Merge branch 'jk/drop-hg-to-git'
Remove an ancient and not well maintained Hg-to-git migration script from contrib/. Acked-by: Stelian Pop <stelian@popies.net> cf. <37e4cd61-b370-437e-bd42-f98f47d3ad32@popies.net> * jk/drop-hg-to-git: contrib: drop hg-to-git script
This commit is contained in:
Junio C Hamano
commit
20d1adb6fc
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#!/usr/bin/env python
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""" hg-to-git.py - A Mercurial to GIT converter
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Copyright (C)2007 Stelian Pop <stelian@popies.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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"""
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import os, os.path, sys
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import tempfile, pickle, getopt
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import re
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if sys.hexversion < 0x02030000:
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# The behavior of the pickle module changed significantly in 2.3
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sys.stderr.write("hg-to-git.py: requires Python 2.3 or later.\n")
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sys.exit(1)
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# Maps hg version -> git version
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hgvers = {}
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# List of children for each hg revision
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hgchildren = {}
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# List of parents for each hg revision
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hgparents = {}
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# Current branch for each hg revision
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hgbranch = {}
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# Number of new changesets converted from hg
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hgnewcsets = 0
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#------------------------------------------------------------------------------
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def usage():
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print("""\
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%s: [OPTIONS] <hgprj>
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options:
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-s, --gitstate=FILE: name of the state to be saved/read
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for incrementals
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-n, --nrepack=INT: number of changesets that will trigger
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a repack (default=0, -1 to deactivate)
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-v, --verbose: be verbose
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required:
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hgprj: name of the HG project to import (directory)
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""" % sys.argv[0])
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#------------------------------------------------------------------------------
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def getgitenv(user, date):
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env = ''
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elems = re.compile('(.*?)\s+<(.*)>').match(user)
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if elems:
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env += 'export GIT_AUTHOR_NAME="%s" ;' % elems.group(1)
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env += 'export GIT_COMMITTER_NAME="%s" ;' % elems.group(1)
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env += 'export GIT_AUTHOR_EMAIL="%s" ;' % elems.group(2)
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env += 'export GIT_COMMITTER_EMAIL="%s" ;' % elems.group(2)
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else:
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env += 'export GIT_AUTHOR_NAME="%s" ;' % user
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env += 'export GIT_COMMITTER_NAME="%s" ;' % user
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env += 'export GIT_AUTHOR_EMAIL= ;'
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env += 'export GIT_COMMITTER_EMAIL= ;'
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env += 'export GIT_AUTHOR_DATE="%s" ;' % date
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env += 'export GIT_COMMITTER_DATE="%s" ;' % date
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return env
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#------------------------------------------------------------------------------
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state = ''
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opt_nrepack = 0
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verbose = False
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try:
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opts, args = getopt.getopt(sys.argv[1:], 's:t:n:v', ['gitstate=', 'tempdir=', 'nrepack=', 'verbose'])
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for o, a in opts:
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if o in ('-s', '--gitstate'):
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state = a
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state = os.path.abspath(state)
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if o in ('-n', '--nrepack'):
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opt_nrepack = int(a)
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if o in ('-v', '--verbose'):
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verbose = True
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if len(args) != 1:
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raise Exception('params')
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except:
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usage()
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sys.exit(1)
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hgprj = args[0]
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os.chdir(hgprj)
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if state:
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if os.path.exists(state):
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if verbose:
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print('State does exist, reading')
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f = open(state, 'r')
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hgvers = pickle.load(f)
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else:
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print('State does not exist, first run')
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sock = os.popen('hg tip --template "{rev}"')
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tip = sock.read()
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if sock.close():
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sys.exit(1)
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if verbose:
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print('tip is', tip)
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# Calculate the branches
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if verbose:
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print('analysing the branches...')
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hgchildren["0"] = ()
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hgparents["0"] = (None, None)
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hgbranch["0"] = "master"
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for cset in range(1, int(tip) + 1):
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hgchildren[str(cset)] = ()
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prnts = os.popen('hg log -r %d --template "{parents}"' % cset).read().strip().split(' ')
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prnts = map(lambda x: x[:x.find(':')], prnts)
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if prnts[0] != '':
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parent = prnts[0].strip()
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else:
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parent = str(cset - 1)
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hgchildren[parent] += ( str(cset), )
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if len(prnts) > 1:
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mparent = prnts[1].strip()
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hgchildren[mparent] += ( str(cset), )
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else:
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mparent = None
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hgparents[str(cset)] = (parent, mparent)
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if mparent:
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# For merge changesets, take either one, preferably the 'master' branch
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if hgbranch[mparent] == 'master':
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hgbranch[str(cset)] = 'master'
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else:
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hgbranch[str(cset)] = hgbranch[parent]
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else:
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# Normal changesets
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# For first children, take the parent branch, for the others create a new branch
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if hgchildren[parent][0] == str(cset):
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hgbranch[str(cset)] = hgbranch[parent]
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else:
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hgbranch[str(cset)] = "branch-" + str(cset)
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if "0" not in hgvers:
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print('creating repository')
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os.system('git init')
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# loop through every hg changeset
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for cset in range(int(tip) + 1):
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# incremental, already seen
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if str(cset) in hgvers:
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continue
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hgnewcsets += 1
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# get info
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log_data = os.popen('hg log -r %d --template "{tags}\n{date|date}\n{author}\n"' % cset).readlines()
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tag = log_data[0].strip()
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date = log_data[1].strip()
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user = log_data[2].strip()
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parent = hgparents[str(cset)][0]
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mparent = hgparents[str(cset)][1]
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#get comment
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(fdcomment, filecomment) = tempfile.mkstemp()
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csetcomment = os.popen('hg log -r %d --template "{desc}"' % cset).read().strip()
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os.write(fdcomment, csetcomment)
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os.close(fdcomment)
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print('-----------------------------------------')
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print('cset:', cset)
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print('branch:', hgbranch[str(cset)])
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print('user:', user)
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print('date:', date)
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print('comment:', csetcomment)
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if parent:
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print('parent:', parent)
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if mparent:
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print('mparent:', mparent)
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if tag:
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print('tag:', tag)
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print('-----------------------------------------')
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# checkout the parent if necessary
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if cset != 0:
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if hgbranch[str(cset)] == "branch-" + str(cset):
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print('creating new branch', hgbranch[str(cset)])
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os.system('git checkout -b %s %s' % (hgbranch[str(cset)], hgvers[parent]))
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else:
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print('checking out branch', hgbranch[str(cset)])
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os.system('git checkout %s' % hgbranch[str(cset)])
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# merge
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if mparent:
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if hgbranch[parent] == hgbranch[str(cset)]:
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otherbranch = hgbranch[mparent]
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else:
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otherbranch = hgbranch[parent]
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print('merging', otherbranch, 'into', hgbranch[str(cset)])
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os.system(getgitenv(user, date) + 'git merge --no-commit -s ours "" %s %s' % (hgbranch[str(cset)], otherbranch))
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# remove everything except .git and .hg directories
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os.system('find . \( -path "./.hg" -o -path "./.git" \) -prune -o ! -name "." -print | xargs rm -rf')
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# repopulate with checkouted files
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os.system('hg update -C %d' % cset)
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# add new files
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os.system('git ls-files -x .hg --others | git update-index --add --stdin')
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# delete removed files
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os.system('git ls-files -x .hg --deleted | git update-index --remove --stdin')
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# commit
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os.system(getgitenv(user, date) + 'git commit --allow-empty --allow-empty-message -a -F %s' % filecomment)
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os.unlink(filecomment)
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# tag
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if tag and tag != 'tip':
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os.system(getgitenv(user, date) + 'git tag %s' % tag)
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# delete branch if not used anymore...
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if mparent and len(hgchildren[str(cset)]):
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print("Deleting unused branch:", otherbranch)
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os.system('git branch -d %s' % otherbranch)
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# retrieve and record the version
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vvv = os.popen('git show --quiet --pretty=format:%H').read()
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print('record', cset, '->', vvv)
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hgvers[str(cset)] = vvv
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if hgnewcsets >= opt_nrepack and opt_nrepack != -1:
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os.system('git repack -a -d')
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# write the state for incrementals
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if state:
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if verbose:
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print('Writing state')
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f = open(state, 'w')
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pickle.dump(hgvers, f)
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# vim: et ts=8 sw=4 sts=4
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@ -1,21 +0,0 @@
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hg-to-git.py is able to convert a Mercurial repository into a git one,
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and preserves the branches in the process (unlike tailor)
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hg-to-git.py can probably be greatly improved (it's a rather crude
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combination of shell and python) but it does already work quite well for
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me. Features:
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- supports incremental conversion
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(for keeping a git repo in sync with a hg one)
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- supports hg branches
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- converts hg tags
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Note that the git repository will be created 'in place' (at the same
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location as the source hg repo). You will have to manually remove the
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'.hg' directory after the conversion.
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Also note that the incremental conversion uses 'simple' hg changesets
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identifiers (ordinals, as opposed to SHA-1 ids), and since these ids
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are not stable across different repositories the hg-to-git.py state file
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is forever tied to one hg repository.
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Stelian Pop <stelian@popies.net>
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