/brz/remove-bazaar

# Copyright (C) 2007 Canonical Ltd

# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>

#

# 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

"""An adapter between a Git Branch and a Bazaar Branch"""

from dulwich.objects import (

    Commit,

    Tag,

    )

from bzrlib import (

    branch,

    config,

    repository,

    revision,

    tag,

    )

from bzrlib.decorators import (

    needs_read_lock,

    )

from bzrlib.trace import (

    mutter,

    )

from bzrlib.plugins.git.errors import (

    NoSuchRef,

    )

from bzrlib.plugins.git.foreign import (

    ForeignBranch,

    )

from bzrlib.plugins.git.errors import (

    LightWeightCheckoutsNotSupported,

    )

class LocalGitTagDict(tag.BasicTags):

    """Dictionary with tags in a local repository."""

    def __init__(self, branch):

        self.branch = branch

        self.repository = branch.repository

    def get_tag_dict(self):

        ret = {}

        for k,v in self.repository._git.tags.iteritems():

            obj = self.repository._git.get_object(v)

            while isinstance(obj, Tag):

                v = obj.object[1]

                obj = self.repository._git.get_object(v)

            if not isinstance(obj, Commit):

                mutter("Tag %s points at object %r that is not a commit, "

                       "ignoring", k, obj)

                continue

            ret[k] = self.branch.mapping.revision_id_foreign_to_bzr(v)

        return ret

    def set_tag(self, name, revid):

        self.repository._git.tags[name] = revid

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, store=config.STORE_BRANCH,

            warn_masked=False):

        """Force local to True"""

        config.BranchConfig.set_user_option(self, name, value,

            store=config.STORE_LOCATION, warn_masked=warn_masked)

class GitBranchFormat(branch.BranchFormat):

    def get_format_description(self):

        return 'Git Branch'

    def supports_tags(self):

        return True

    def make_tags(self, branch):

        if getattr(branch.repository, "get_refs", None) is not None:

            from bzrlib.plugins.git.remote import RemoteGitTagDict

            return RemoteGitTagDict(branch)

        else:

            return LocalGitTagDict(branch)

class GitBranch(ForeignBranch):

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

    def __init__(self, bzrdir, repository, name, head, lockfiles):

        self.repository = repository

        self._format = GitBranchFormat()

        super(GitBranch, self).__init__(repository.get_mapping())

        self.control_files = lockfiles

        self.bzrdir = bzrdir

        self.name = name

        self.head = head

        self.base = bzrdir.transport.base

    def dpull(self, source, stop_revision=None):

        if stop_revision is None:

            stop_revision = source.last_revision()

        # FIXME: Check for diverged branches

        revidmap = self.repository.dfetch(source.repository, stop_revision)

        self.head, self.mapping = self.mapping.revision_id_bzr_to_foreign(

            revidmap[stop_revision])

        self.repository._git.set_ref(self.name, self.head)

        return revidmap

    def lock_write(self):

        self.control_files.lock_write()

    def get_stacked_on_url(self):

        # Git doesn't do stacking (yet...)

        return None

    def get_parent(self):

        """See Branch.get_parent()."""

        return None

    def set_parent(self, url):

        pass

    def lock_read(self):

        self.control_files.lock_read()

    def unlock(self):

        self.control_files.unlock()

    def get_physical_lock_status(self):

        return False

class LocalGitBranch(GitBranch):

    """A local Git branch."""

    @needs_read_lock

    def last_revision(self):

        # perhaps should escape this ?

        if self.head is None:

            return revision.NULL_REVISION

        return self.mapping.revision_id_foreign_to_bzr(self.head)

    def create_checkout(self, to_location, revision_id=None, lightweight=False,

        accelerator_tree=None, hardlink=False):

        if lightweight:

            raise LightWeightCheckoutsNotSupported()

        return self._create_heavyweight_checkout(to_location, revision_id,

            hardlink)

    def _create_heavyweight_checkout(self, to_location, revision_id=None, 

                                     hardlink=False):

        """Create a new heavyweight checkout of this branch.

        :param to_location: URL of location to create the new checkout in.

        :param revision_id: Revision that should be the tip of the checkout.

        :param hardlink: Whether to hardlink

        :return: WorkingTree object of checkout.

        """

        checkout_branch = BzrDir.create_branch_convenience(

            to_location, force_new_tree=False, format=get_rich_root_format())

        checkout = checkout_branch.bzrdir

        checkout_branch.bind(self)

        # pull up to the specified revision_id to set the initial 

        # branch tip correctly, and seed it with history.

        checkout_branch.pull(self, stop_revision=revision_id)

        return checkout.create_workingtree(revision_id, hardlink=hardlink)

    def _gen_revision_history(self):

        if self.head is None:

            return []

        ret = list(self.repository.iter_reverse_revision_history(

            self.last_revision()))

        ret.reverse()

        return ret

    def get_config(self):

        return GitBranchConfig(self)

    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,

                                          store=config.STORE_LOCATION)

    def supports_tags(self):

        return True

class InterGitGenericBranch(branch.InterBranch):

    """InterBranch implementation that pulls from Git into bzr."""

    @classmethod

    def is_compatible(self, source, target):

        return isinstance(source, GitBranch)

    def update_revisions(self, stop_revision=None, overwrite=False,

        graph=None):

        """See InterBranch.update_revisions()."""

        # TODO: stop_revision, overwrite

        interrepo = repository.InterRepository.get(self.source.repository, 

            self.target.repository)

        self._last_revid = None

        def determine_wants(heads):

            if not self.source.name in heads:

                raise NoSuchRef(self.source.name, heads.keys())

            head = heads[self.source.name]

            self._last_revid = self.source.mapping.revision_id_foreign_to_bzr(

                head)

            if self.target.repository.has_revision(self._last_revid):

                return []

            return [head]

        interrepo.fetch_objects(determine_wants, self.source.mapping)

        self.target.generate_revision_history(self._last_revid)

branch.InterBranch.register_optimiser(InterGitGenericBranch)