diff options
Diffstat (limited to 'contrib/remote-helpers/git-remote-hg')
| -rwxr-xr-x | contrib/remote-helpers/git-remote-hg | 794 |
1 files changed, 794 insertions, 0 deletions
diff --git a/contrib/remote-helpers/git-remote-hg b/contrib/remote-helpers/git-remote-hg new file mode 100755 index 0000000000..c7006000a6 --- /dev/null +++ b/contrib/remote-helpers/git-remote-hg @@ -0,0 +1,794 @@ +#!/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 $PATH. +# Then you can clone with: +# git clone hg::/path/to/mercurial/repo/ + +from mercurial import hg, ui, bookmarks, context, util, encoding + +import re +import sys +import os +import json +import shutil +import subprocess +import urllib + +# +# If you want to switch to hg-git compatibility mode: +# git config --global remote-hg.hg-git-compat true +# +# git: +# Sensible defaults for git. +# hg bookmarks are exported as git branches, hg branches are prefixed +# with 'branches/', HEAD is a special case. +# +# hg: +# Emulate hg-git. +# Only hg bookmarks are exported as git branches. +# Commits are modified to preserve hg information and allow bidirectionality. +# + +NAME_RE = re.compile('^([^<>]+)') +AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$') +AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$') +RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)') + +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) + +def hgmode(mode): + m = { '0100755': 'x', '0120000': 'l' } + return m.get(mode, '') + +def get_config(config): + cmd = ['git', 'config', '--get', config] + process = subprocess.Popen(cmd, stdout=subprocess.PIPE) + output, _ = process.communicate() + return output + +class Marks: + + def __init__(self, path): + self.path = path + self.tips = {} + self.marks = {} + self.rev_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'] + + for rev, mark in self.marks.iteritems(): + self.rev_marks[mark] = int(rev) + + 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 to_rev(self, mark): + return self.rev_marks[mark] + + def get_mark(self, rev): + self.last_mark += 1 + self.marks[str(rev)] = self.last_mark + return self.last_mark + + def new_mark(self, rev, mark): + self.marks[str(rev)] = mark + self.rev_marks[mark] = rev + self.last_mark = 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 get_mark(self): + i = self.line.index(':') + 1 + return int(self.line[i:]) + + def get_data(self): + if not self.check('data'): + return None + i = self.line.index(' ') + 1 + size = int(self.line[i:]) + return sys.stdin.read(size) + + def get_author(self): + global bad_mail + + ex = None + m = RAW_AUTHOR_RE.match(self.line) + if not m: + return None + _, name, email, date, tz = m.groups() + if name and 'ext:' in name: + m = re.match('^(.+?) ext:\((.+)\)$', name) + if m: + name = m.group(1) + ex = urllib.unquote(m.group(2)) + + if email != bad_mail: + if name: + user = '%s <%s>' % (name, email) + else: + user = '<%s>' % (email) + else: + user = name + + if ex: + user += ex + + tz = int(tz) + tz = ((tz / 100) * 3600) + ((tz % 100) * 60) + return (user, int(date), -tz) + +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_git(user): + name = mail = None + user = user.replace('"', '') + 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() + return (name, mail) + +def fixup_user_hg(user): + def sanitize(name): + # stole this from hg-git + return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> ')) + + m = AUTHOR_HG_RE.match(user) + if m: + name = sanitize(m.group(1)) + mail = sanitize(m.group(2)) + ex = m.group(3) + if ex: + name += ' ext:(' + urllib.quote(ex) + ')' + else: + name = sanitize(user) + if '@' in user: + mail = name + else: + mail = None + + return (name, mail) + +def fixup_user(user): + global mode, bad_mail + + if mode == 'git': + name, mail = fixup_user_git(user) + else: + name, mail = fixup_user_hg(user) + + if not name: + name = bad_name + if not mail: + mail = bad_mail + + return '%s <%s>' % (name, mail) + +def get_repo(url, alias): + global dirname, peer + + 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 mark_to_rev(mark): + global marks + return marks.to_rev(mark) + +def export_ref(repo, name, kind, head): + global prefix, marks, mode + + 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 = xrange(tip, head.rev() + 1) + 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 mode == 'hg': + extra_msg = '' + + if rev_branch != 'default': + extra_msg += 'branch : %s\n' % rev_branch + + renames = [] + for f in c.files(): + if f not in c.manifest(): + continue + rename = c.filectx(f).renamed() + if rename: + renames.append((rename[0], f)) + + for e in renames: + extra_msg += "rename : %s => %s\n" % e + + for key, value in extra.iteritems(): + if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'): + continue + else: + extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value)) + + desc += '\n' + if extra_msg: + desc += '\n--HG--\n' + extra_msg + + 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 "export" + print "refspec refs/heads/branches/*:%s/branches/*" % prefix + print "refspec refs/heads/*:%s/bookmarks/*" % prefix + print "refspec refs/tags/*:%s/tags/*" % prefix + + path = os.path.join(dirname, 'marks-git') + + if os.path.exists(path): + print "*import-marks %s" % path + print "*export-marks %s" % path + + 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, bmarks + + head = bookmarks.readcurrent(repo) + if head: + node = repo[head] + else: + # fake bookmark from current branch + head = cur + node = repo['.'] + if not node: + node = repo['tip'] + if not node: + return + if head == 'default': + head = 'master' + bmarks[head] = node + + print "@refs/heads/%s HEAD" % head + g_head = (head, node) + +def do_list(parser): + global branches, bmarks, mode, track_branches + + repo = parser.repo + for bmark, node in bookmarks.listbookmarks(repo).iteritems(): + bmarks[bmark] = repo[node] + + cur = repo.dirstate.branch() + + list_head(repo, cur) + + if track_branches: + for branch in repo.branchmap(): + heads = repo.branchheads(branch) + if len(heads): + branches[branch] = heads + + 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() + + tmp = encoding.encoding + encoding.encoding = 'utf-8' + + # 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() + + encoding.encoding = tmp + + print 'done' + +def parse_blob(parser): + global blob_marks + + parser.next() + mark = parser.get_mark() + parser.next() + data = parser.get_data() + blob_marks[mark] = data + parser.next() + return + +def get_merge_files(repo, p1, p2, files): + for e in repo[p1].files(): + if e not in files: + if e not in repo[p1].manifest(): + continue + f = { 'ctx' : repo[p1][e] } + files[e] = f + +def parse_commit(parser): + global marks, blob_marks, bmarks, parsed_refs + global mode + + from_mark = merge_mark = None + + ref = parser[1] + parser.next() + + commit_mark = parser.get_mark() + parser.next() + author = parser.get_author() + parser.next() + committer = parser.get_author() + parser.next() + data = parser.get_data() + parser.next() + if parser.check('from'): + from_mark = parser.get_mark() + parser.next() + if parser.check('merge'): + merge_mark = parser.get_mark() + parser.next() + if parser.check('merge'): + die('octopus merges are not supported yet') + + files = {} + + for line in parser: + if parser.check('M'): + t, m, mark_ref, path = line.split(' ', 3) + mark = int(mark_ref[1:]) + f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] } + elif parser.check('D'): + t, path = line.split(' ') + f = { 'deleted' : True } + else: + die('Unknown file command: %s' % line) + files[path] = f + + def getfilectx(repo, memctx, f): + of = files[f] + if 'deleted' in of: + raise IOError + if 'ctx' in of: + return of['ctx'] + is_exec = of['mode'] == 'x' + is_link = of['mode'] == 'l' + rename = of.get('rename', None) + return context.memfilectx(f, of['data'], + is_link, is_exec, rename) + + repo = parser.repo + + user, date, tz = author + extra = {} + + if committer != author: + extra['committer'] = "%s %u %u" % committer + + if from_mark: + p1 = repo.changelog.node(mark_to_rev(from_mark)) + else: + p1 = '\0' * 20 + + if merge_mark: + p2 = repo.changelog.node(mark_to_rev(merge_mark)) + else: + p2 = '\0' * 20 + + # + # If files changed from any of the parents, hg wants to know, but in git if + # nothing changed from the first parent, nothing changed. + # + if merge_mark: + get_merge_files(repo, p1, p2, files) + + if mode == 'hg': + i = data.find('\n--HG--\n') + if i >= 0: + tmp = data[i + len('\n--HG--\n'):].strip() + for k, v in [e.split(' : ') for e in tmp.split('\n')]: + if k == 'rename': + old, new = v.split(' => ', 1) + files[new]['rename'] = old + elif k == 'branch': + extra[k] = v + elif k == 'extra': + ek, ev = v.split(' : ', 1) + extra[ek] = urllib.unquote(ev) + data = data[:i] + + ctx = context.memctx(repo, (p1, p2), data, + files.keys(), getfilectx, + user, (date, tz), extra) + + tmp = encoding.encoding + encoding.encoding = 'utf-8' + + node = repo.commitctx(ctx) + + encoding.encoding = tmp + + rev = repo[node].rev() + + parsed_refs[ref] = node + + marks.new_mark(rev, commit_mark) + +def parse_reset(parser): + ref = parser[1] + parser.next() + # ugh + if parser.check('commit'): + parse_commit(parser) + return + if not parser.check('from'): + return + from_mark = parser.get_mark() + parser.next() + + node = parser.repo.changelog.node(mark_to_rev(from_mark)) + parsed_refs[ref] = node + +def parse_tag(parser): + name = parser[1] + parser.next() + from_mark = parser.get_mark() + parser.next() + tagger = parser.get_author() + parser.next() + data = parser.get_data() + parser.next() + + # nothing to do + +def do_export(parser): + global parsed_refs, bmarks, peer + + parser.next() + + for line in parser.each_block('done'): + if parser.check('blob'): + parse_blob(parser) + elif parser.check('commit'): + parse_commit(parser) + elif parser.check('reset'): + parse_reset(parser) + elif parser.check('tag'): + parse_tag(parser) + elif parser.check('feature'): + pass + else: + die('unhandled export command: %s' % line) + + for ref, node in parsed_refs.iteritems(): + if ref.startswith('refs/heads/branches'): + pass + elif ref.startswith('refs/heads/'): + bmark = ref[len('refs/heads/'):] + if bmark in bmarks: + old = bmarks[bmark].hex() + else: + old = '' + if not bookmarks.pushbookmark(parser.repo, bmark, old, node): + continue + elif ref.startswith('refs/tags/'): + tag = ref[len('refs/tags/'):] + parser.repo.tag([tag], node, None, True, None, {}) + else: + # transport-helper/fast-export bugs + continue + print "ok %s" % ref + + print + + if peer: + parser.repo.push(peer, force=False) + +def main(args): + global prefix, dirname, branches, bmarks + global marks, blob_marks, parsed_refs + global peer, mode, bad_mail, bad_name + global track_branches + + alias = args[1] + url = args[2] + peer = None + + hg_git_compat = False + track_branches = True + try: + if get_config('remote-hg.hg-git-compat') == 'true\n': + hg_git_compat = True + track_branches = False + if get_config('remote-hg.track-branches') == 'false\n': + track_branches = False + except subprocess.CalledProcessError: + pass + + if hg_git_compat: + mode = 'hg' + bad_mail = 'none@none' + bad_name = '' + else: + mode = 'git' + bad_mail = 'unknown' + bad_name = 'Unknown' + + if alias[4:] == url: + is_tmp = True + alias = util.sha1(alias).hexdigest() + else: + is_tmp = False + + gitdir = os.environ['GIT_DIR'] + dirname = os.path.join(gitdir, 'hg', alias) + branches = {} + bmarks = {} + blob_marks = {} + parsed_refs = {} + + 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() + + if not is_tmp: + marks.store() + else: + shutil.rmtree(dirname) + +sys.exit(main(sys.argv)) |