/brz/remove-bazaar

# Copyright (C) 2006 Canonical Ltd

# Authors: Robert Collins <robert.collins@canonical.com>

#

# 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 of the License, 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, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""A GIT branch and repository format implementation for bzr."""

from StringIO import StringIO

import stgit

import stgit.git as git

from bzrlib import config, graph, urlutils

from bzrlib.decorators import *

import bzrlib.branch

import bzrlib.bzrdir

import bzrlib.errors as errors

import bzrlib.repository

from bzrlib.revision import Revision

class GitBranchConfig(config.BranchConfig):

    """BranchConfig that uses locations.conf in place of branch.conf""" 

    def __init__(self, branch):

        config.BranchConfig.__init__(self, branch)

        # do not provide a BranchDataConfig

        self.option_sources = self.option_sources[0], self.option_sources[2]

    def set_user_option(self, name, value, local=False):

        """Force local to True"""

        config.BranchConfig.set_user_option(self, name, value, local=True)

def gitrevid_from_bzr(revision_id):

    return revision_id[4:]

def bzrrevid_from_git(revision_id):

    return "git:" + revision_id

class GitLock(object):

    """A lock that thunks through to Git."""

    def lock_write(self):

        pass

    def lock_read(self):

        pass

    def unlock(self):

        pass

class GitLockableFiles(bzrlib.lockable_files.LockableFiles):

    """Git specific lockable files abstraction."""

    def __init__(self, lock):

        self._lock = lock

        self._transaction = None

        self._lock_mode = None

        self._lock_count = 0

class GitDir(bzrlib.bzrdir.BzrDir):

    """An adapter to the '.git' dir used by git."""

    def __init__(self, transport, lockfiles, format):

        self._format = format

        self.root_transport = transport

        self.transport = transport.clone('.git')

        self._lockfiles = lockfiles

    def get_branch_transport(self, branch_format):

        if branch_format is None:

            return self.transport

        if isinstance(branch_format, GitBzrDirFormat):

            return self.transport

        raise errors.IncompatibleFormat(branch_format, self._format)

    get_repository_transport = get_branch_transport

    get_workingtree_transport = get_branch_transport

    def is_supported(self):

        return True

    def open_branch(self, ignored=None):

        """'crate' a branch for this dir."""

        return GitBranch(self, self._lockfiles)

    def open_repository(self, shared=False):

        """'open' a repository for this dir."""

        return GitRepository(self._gitrepo, self, self._lockfiles)

    def open_workingtree(self):

        loc = urlutils.unescape_for_display(self.root_transport.base, 'ascii')

        raise errors.NoWorkingTree(loc)

class GitBzrDirFormat(bzrlib.bzrdir.BzrDirFormat):

    """The .git directory control format."""

    @classmethod

    def _known_formats(self):

        return set([GitBzrDirFormat()])

    def open(self, transport, _create=False, _found=None):

        """Open this directory.

        :param _create: create the git dir on the fly. private to GitDirFormat.

        """

        # we dont grok readonly - git isn't integrated with transport.

        url = transport.base

        if url.startswith('readonly+'):

            url = url[len('readonly+'):]

        if url.startswith('file://'):

            url = url[len('file://'):]

        url = url.encode('utf8')

        lockfiles = GitLockableFiles(GitLock())

        return GitDir(transport, lockfiles, self)

    @classmethod

    def probe_transport(klass, transport):

        """Our format is present if the transport ends in '.not/'."""

        # little ugly, but works

        format = klass() 

        # try a manual probe first, its a little faster perhaps ?

        if transport.has('.git'):

            return format

        # delegate to the main opening code. This pays a double rtt cost at the

        # moment, so perhaps we want probe_transport to return the opened thing

        # rather than an openener ? or we could return a curried thing with the

        # dir to open already instantiated ? Needs more thought.

        try:

            format.open(transport)

            return format

        except Exception, e:

            raise errors.NotBranchError(path=transport.base)

        raise errors.NotBranchError(path=transport.base)

bzrlib.bzrdir.BzrDirFormat.register_control_format(GitBzrDirFormat)

class GitBranch(bzrlib.branch.Branch):

    """An adapter to git repositories for bzr Branch objects."""

    def __init__(self, gitdir, lockfiles):

        self.bzrdir = gitdir

        self.control_files = lockfiles

        self.repository = GitRepository(gitdir, lockfiles)

        self.base = gitdir.root_transport.base

        if '.git' not in gitdir.root_transport.list_dir('.'):

            raise errors.NotBranchError(self.base)

    def lock_write(self):

        self.control_files.lock_write()

    @needs_read_lock

    def last_revision(self):

        # perhaps should escape this ?

        return bzrrevid_from_git(self.repository.git.get_head())

    @needs_read_lock

    def revision_history(self):

        node = self.last_revision()

        graph = self.repository.get_revision_graph_with_ghosts([node])

        ancestors = graph.get_ancestors()

        history = []

        while node is not None:

            history.append(node)

            if len(ancestors[node]) > 0:

                node = ancestors[node][0]

            else:

                node = None

        return list(reversed(history))

    def get_config(self):

        return GitBranchConfig(self)

    def lock_read(self):

        self.control_files.lock_read()

    def unlock(self):

        self.control_files.unlock()

    def get_push_location(self):

        """See Branch.get_push_location."""

        push_loc = self.get_config().get_user_option('push_location')

        return push_loc

    def set_push_location(self, location):

        """See Branch.set_push_location."""

        self.get_config().set_user_option('push_location', location, 

                                          local=True)

class GitRepository(bzrlib.repository.Repository):

    """An adapter to git repositories for bzr."""

    def __init__(self, gitdir, lockfiles):

        self.bzrdir = gitdir

        self.control_files = lockfiles

        gitdirectory = urlutils.local_path_from_url(gitdir.transport.base)

        self.git = GitModel(gitdirectory)

        self._revision_cache = {}

    def _ancestor_revisions(self, revision_ids):

        git_revisions = [gitrevid_from_bzr(r) for r in revision_ids]

        for lines in self.git.ancestor_lines(git_revisions):

            yield self.parse_rev(lines)

    def get_revision_graph_with_ghosts(self, revision_ids=None):

        result = graph.Graph()

        for revision in self._ancestor_revisions(revision_ids):

            result.add_node(revision.revision_id, revision.parent_ids)

            self._revision_cache[revision.revision_id] = revision

        return result

    def get_revision(self, revision_id):

        if revision_id in self._revision_cache:

            return self._revision_cache[revision_id]

        raw = self.git.rev_list([gitrevid_from_bzr(revision_id)], max_count=1,

                                header=True)

        return self.parse_rev(raw)

    def parse_rev(self, raw):

        # first field is the rev itself.

        # then its 'field value'

        # until the EOF??

        parents = []

        log = []

        in_log = False

        committer = None

        revision_id = bzrrevid_from_git(raw[0][:-1])

        for field in raw[1:]:

            #if field.startswith('author '):

            #    committer = field[7:]

            if field.startswith('parent '):

                parents.append(bzrrevid_from_git(field.split()[1]))

            elif field.startswith('committer '):

                commit_fields = field.split()

                if committer is None:

                    committer = ' '.join(commit_fields[1:-3])

                timestamp = commit_fields[-2]

                timezone = commit_fields[-1]

            elif in_log:

                log.append(field[4:])

            elif field == '\n':

                in_log = True

        log = ''.join(log)

        result = Revision(revision_id)

        result.parent_ids = parents

        result.message = log

        result.inventory_sha1 = ""

        result.timezone = timezone and int(timezone)

        result.timestamp = float(timestamp)

        result.committer = committer 

        return result

class GitModel(object):

    """API that follows GIT model closely"""

    def __init__(self, git_dir):

        self.git_dir = git_dir

    def git_command(self, command, args):

        args = ' '.join(args)

        return 'git --git-dir=%s %s %s' % (self.git_dir, command, args) 

    def git_lines(self, command, args):

        return stgit.git._output_lines(self.git_command(command, args))

    def git_line(self, command, args):

        return stgit.git._output_one_line(self.git_command(command, args))

    def rev_list(self, heads, max_count=None, header=False):

        args = []

        if max_count is not None:

            args.append('--max-count=%d' % max_count)

        if header is not False:

            args.append('--header')

        args.extend(heads)

        return self.git_lines('rev-list', args)

    def rev_parse(self, git_id):

        args = ['--verify', git_id]

        return self.git_line('rev-parse', args)

    def get_head(self):

        return self.rev_parse('HEAD')

    def ancestor_lines(self, revisions):

        revision_lines = []

        for line in self.rev_list(revisions, header=True):

            if line.startswith('\x00'):

                yield revision_lines

                revision_lines = [line[1:]]

            else:

                revision_lines.append(line)

        assert revision_lines == ['']