Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
contrib/remote-helpers/git-remote-hg | 391 +++++++++++++++++++++++++++++++++++
1 file changed, 391 insertions(+)
create mode 100755 contrib/remote-helpers/git-remote-hg
diff --git a/contrib/remote-helpers/git-remote-hg b/contrib/remote-helpers/git-remote-hg
new file mode 100755
index 0000000..e37e278
--- /dev/null
+++ b/contrib/remote-helpers/git-remote-hg
@@ -0,0 +1,391 @@
+#!/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))
--
1.8.0
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