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Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
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Felipe Contreras
2014-05-09 08:25:22 -05:00
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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Copyright (C) <year> <name of author>
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Also add information on how to contact you by electronic and paper mail.
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Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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#!/usr/bin/env python
#
# Copyright (c) 2012 Felipe Contreras
#
# Inspired by Rocco Rutte's hg-fast-export
# Just copy to your ~/bin, or anywhere in your $PATH.
# Then you can clone with:
# git clone hg::/path/to/mercurial/repo/
from mercurial import hg, ui, bookmarks
import re
import sys
import os
import json
NAME_RE = re.compile('^([^<>]+)')
AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]+)>$')
def die(msg, *args):
sys.stderr.write('ERROR: %s\n' % (msg % args))
sys.exit(1)
def warn(msg, *args):
sys.stderr.write('WARNING: %s\n' % (msg % args))
def gitmode(flags):
return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
def gittz(tz):
return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
class Marks:
def __init__(self, path):
self.path = path
self.tips = {}
self.marks = {}
self.last_mark = 0
self.load()
def load(self):
if not os.path.exists(self.path):
return
tmp = json.load(open(self.path))
self.tips = tmp['tips']
self.marks = tmp['marks']
self.last_mark = tmp['last-mark']
def dict(self):
return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
def store(self):
json.dump(self.dict(), open(self.path, 'w'))
def __str__(self):
return str(self.dict())
def from_rev(self, rev):
return self.marks[str(rev)]
def get_mark(self, rev):
self.last_mark += 1
self.marks[str(rev)] = self.last_mark
return self.last_mark
def is_marked(self, rev):
return self.marks.has_key(str(rev))
def get_tip(self, branch):
return self.tips.get(branch, 0)
def set_tip(self, branch, tip):
self.tips[branch] = tip
class Parser:
def __init__(self, repo):
self.repo = repo
self.line = self.get_line()
def get_line(self):
return sys.stdin.readline().strip()
def __getitem__(self, i):
return self.line.split()[i]
def check(self, word):
return self.line.startswith(word)
def each_block(self, separator):
while self.line != separator:
yield self.line
self.line = self.get_line()
def __iter__(self):
return self.each_block('')
def next(self):
self.line = self.get_line()
if self.line == 'done':
self.line = None
def export_file(fc):
d = fc.data()
print "M %s inline %s" % (gitmode(fc.flags()), fc.path())
print "data %d" % len(d)
print d
def get_filechanges(repo, ctx, parent):
modified = set()
added = set()
removed = set()
cur = ctx.manifest()
prev = repo[parent].manifest().copy()
for fn in cur:
if fn in prev:
if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
modified.add(fn)
del prev[fn]
else:
added.add(fn)
removed |= set(prev.keys())
return added | modified, removed
def fixup_user(user):
user = user.replace('"', '')
name = mail = None
m = AUTHOR_RE.match(user)
if m:
name = m.group(1)
mail = m.group(2).strip()
else:
m = NAME_RE.match(user)
if m:
name = m.group(1).strip()
if not name:
name = 'Unknown'
if not mail:
mail = 'unknown'
return '%s <%s>' % (name, mail)
def get_repo(url, alias):
global dirname
myui = ui.ui()
myui.setconfig('ui', 'interactive', 'off')
if hg.islocal(url):
repo = hg.repository(myui, url)
else:
local_path = os.path.join(dirname, 'clone')
if not os.path.exists(local_path):
peer, dstpeer = hg.clone(myui, {}, url, local_path, update=False, pull=True)
repo = dstpeer.local()
else:
repo = hg.repository(myui, local_path)
peer = hg.peer(myui, {}, url)
repo.pull(peer, heads=None, force=True)
return repo
def rev_to_mark(rev):
global marks
return marks.from_rev(rev)
def export_ref(repo, name, kind, head):
global prefix, marks
ename = '%s/%s' % (kind, name)
tip = marks.get_tip(ename)
# mercurial takes too much time checking this
if tip and tip == head.rev():
# nothing to do
return
revs = repo.revs('%u:%u' % (tip, head))
count = 0
revs = [rev for rev in revs if not marks.is_marked(rev)]
for rev in revs:
c = repo[rev]
(manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
rev_branch = extra['branch']
author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
if 'committer' in extra:
user, time, tz = extra['committer'].rsplit(' ', 2)
committer = "%s %s %s" % (user, time, gittz(int(tz)))
else:
committer = author
parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
if len(parents) == 0:
modified = c.manifest().keys()
removed = []
else:
modified, removed = get_filechanges(repo, c, parents[0])
if len(parents) == 0 and rev:
print 'reset %s/%s' % (prefix, ename)
print "commit %s/%s" % (prefix, ename)
print "mark :%d" % (marks.get_mark(rev))
print "author %s" % (author)
print "committer %s" % (committer)
print "data %d" % (len(desc))
print desc
if len(parents) > 0:
print "from :%s" % (rev_to_mark(parents[0]))
if len(parents) > 1:
print "merge :%s" % (rev_to_mark(parents[1]))
for f in modified:
export_file(c.filectx(f))
for f in removed:
print "D %s" % (f)
print
count += 1
if (count % 100 == 0):
print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
print "#############################################################"
# make sure the ref is updated
print "reset %s/%s" % (prefix, ename)
print "from :%u" % rev_to_mark(rev)
print
marks.set_tip(ename, rev)
def export_tag(repo, tag):
export_ref(repo, tag, 'tags', repo[tag])
def export_bookmark(repo, bmark):
head = bmarks[bmark]
export_ref(repo, bmark, 'bookmarks', head)
def export_branch(repo, branch):
tip = get_branch_tip(repo, branch)
head = repo[tip]
export_ref(repo, branch, 'branches', head)
def export_head(repo):
global g_head
export_ref(repo, g_head[0], 'bookmarks', g_head[1])
def do_capabilities(parser):
global prefix, dirname
print "import"
print "refspec refs/heads/branches/*:%s/branches/*" % prefix
print "refspec refs/heads/*:%s/bookmarks/*" % prefix
print "refspec refs/tags/*:%s/tags/*" % prefix
print
def get_branch_tip(repo, branch):
global branches
heads = branches.get(branch, None)
if not heads:
return None
# verify there's only one head
if (len(heads) > 1):
warn("Branch '%s' has more than one head, consider merging" % branch)
# older versions of mercurial don't have this
if hasattr(repo, "branchtip"):
return repo.branchtip(branch)
return heads[0]
def list_head(repo, cur):
global g_head
head = bookmarks.readcurrent(repo)
if not head:
return
node = repo[head]
print "@refs/heads/%s HEAD" % head
g_head = (head, node)
def do_list(parser):
global branches, bmarks
repo = parser.repo
for branch in repo.branchmap():
heads = repo.branchheads(branch)
if len(heads):
branches[branch] = heads
for bmark, node in bookmarks.listbookmarks(repo).iteritems():
bmarks[bmark] = repo[node]
cur = repo.dirstate.branch()
list_head(repo, cur)
for branch in branches:
print "? refs/heads/branches/%s" % branch
for bmark in bmarks:
print "? refs/heads/%s" % bmark
for tag, node in repo.tagslist():
if tag == 'tip':
continue
print "? refs/tags/%s" % tag
print
def do_import(parser):
repo = parser.repo
path = os.path.join(dirname, 'marks-git')
print "feature done"
if os.path.exists(path):
print "feature import-marks=%s" % path
print "feature export-marks=%s" % path
sys.stdout.flush()
# lets get all the import lines
while parser.check('import'):
ref = parser[1]
if (ref == 'HEAD'):
export_head(repo)
elif ref.startswith('refs/heads/branches/'):
branch = ref[len('refs/heads/branches/'):]
export_branch(repo, branch)
elif ref.startswith('refs/heads/'):
bmark = ref[len('refs/heads/'):]
export_bookmark(repo, bmark)
elif ref.startswith('refs/tags/'):
tag = ref[len('refs/tags/'):]
export_tag(repo, tag)
parser.next()
print 'done'
def main(args):
global prefix, dirname, marks, branches, bmarks
alias = args[1]
url = args[2]
gitdir = os.environ['GIT_DIR']
dirname = os.path.join(gitdir, 'hg', alias)
branches = {}
bmarks = {}
repo = get_repo(url, alias)
prefix = 'refs/hg/%s' % alias
if not os.path.exists(dirname):
os.makedirs(dirname)
marks_path = os.path.join(dirname, 'marks-hg')
marks = Marks(marks_path)
parser = Parser(repo)
for line in parser:
if parser.check('capabilities'):
do_capabilities(parser)
elif parser.check('list'):
do_list(parser)
elif parser.check('import'):
do_import(parser)
elif parser.check('export'):
do_export(parser)
else:
die('unhandled command: %s' % line)
sys.stdout.flush()
marks.store()
sys.exit(main(sys.argv))