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branch.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""An adapter between a Git Branch and a Bazaar Branch"""
 
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from bzrlib import (
 
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    branch,
 
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    config,
 
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    revision,
 
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    tag,
 
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    )
 
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from bzrlib.decorators import needs_read_lock
 
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from bzrlib.trace import mutter
 
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from bzrlib.plugins.git.foreign import ForeignBranch
 
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from bzrlib.plugins.git.errors import LightWeightCheckoutsNotSupported
 
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from dulwich.objects import (
 
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        Commit,
 
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        Tag,
 
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        )
 
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class GitTagDict(tag.BasicTags):
 
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    def __init__(self, branch):
 
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        self.branch = branch
 
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        self.repository = branch.repository
 
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    def get_tag_dict(self):
 
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        ret = {}
 
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        for k,v in self.repository._git.tags.iteritems():
 
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            obj = self.repository._git.get_object(v)
 
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            while isinstance(obj, Tag):
 
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                v = obj.object[1]
 
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                obj = self.repository._git.get_object(v)
 
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            if not isinstance(obj, Commit):
 
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                mutter("Tag %s points at object %r that is not a commit, ignoring", k, obj)
 
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                continue
 
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            ret[k] = self.branch.mapping.revision_id_foreign_to_bzr(v)
 
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        return ret
 
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    def set_tag(self, name, revid):
 
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        self.repository._git.tags[name] = revid
 
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class GitBranchConfig(config.BranchConfig):
 
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    """BranchConfig that uses locations.conf in place of branch.conf"""
 
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    def __init__(self, branch):
 
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        config.BranchConfig.__init__(self, branch)
 
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        # do not provide a BranchDataConfig
 
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        self.option_sources = self.option_sources[0], self.option_sources[2]
 
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    def set_user_option(self, name, value, store=config.STORE_BRANCH, warn_masked=False):
 
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        """Force local to True"""
 
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        config.BranchConfig.set_user_option(self, name, value, store=config.STORE_LOCATION, warn_masked=warn_masked)
 
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class GitBranchFormat(branch.BranchFormat):
 
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    def get_format_description(self):
 
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        return 'Git Branch'
 
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    def supports_tags(self):
 
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        return True
 
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class GitBranch(ForeignBranch):
 
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    """An adapter to git repositories for bzr Branch objects."""
 
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    def __init__(self, bzrdir, repository, name, head, lockfiles):
 
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        self.repository = repository
 
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        super(GitBranch, self).__init__(repository.get_mapping())
 
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        self.control_files = lockfiles
 
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        self.bzrdir = bzrdir
 
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        self.name = name
 
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        self.head = head
 
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        self.base = bzrdir.transport.base
 
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        self._format = GitBranchFormat()
 
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    def dpull(self, source, stop_revision=None):
 
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        if stop_revision is None:
 
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            stop_revision = source.last_revision()
 
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        # FIXME: Check for diverged branches
 
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        revidmap = self.repository.dfetch(source.repository, stop_revision)
 
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        self.head, self.mapping = self.mapping.revision_id_bzr_to_foreign(revidmap[stop_revision])
 
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        return revidmap
 
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    def lock_write(self):
 
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        self.control_files.lock_write()
 
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    def get_stacked_on_url(self):
 
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        # Git doesn't do stacking (yet...)
 
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        return None
 
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    def get_parent(self):
 
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        """See Branch.get_parent()."""
 
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        return None
 
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    def set_parent(self, url):
 
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        pass
 
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    def lock_read(self):
 
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        self.control_files.lock_read()
 
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    def unlock(self):
 
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        self.control_files.unlock()
 
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    def get_physical_lock_status(self):
 
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        return False
 
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class LocalGitBranch(GitBranch):
 
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    @needs_read_lock
 
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    def last_revision(self):
 
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        # perhaps should escape this ?
 
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        if self.head is None:
 
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            return revision.NULL_REVISION
 
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        return self.mapping.revision_id_foreign_to_bzr(self.head)
 
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    def create_checkout(self, to_location, revision_id=None, 
 
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                        lightweight=False, accelerator_tree=None, hardlink=False):
 
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        if lightweight:
 
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            raise LightWeightCheckoutsNotSupported()
 
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        return self._create_heavyweight_checkout(to_location, revision_id, hardlink)
 
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    def _create_heavyweight_checkout(self, to_location, revision_id=None, 
 
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                                     hardlink=False):
 
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        """Create a new heavyweight checkout of this branch.
 
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        :param to_location: URL of location to create the new checkout in.
 
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        :param revision_id: Revision that should be the tip of the checkout.
 
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        :param hardlink: Whether to hardlink
 
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        :return: WorkingTree object of checkout.
 
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        """
 
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        checkout_branch = BzrDir.create_branch_convenience(
 
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            to_location, force_new_tree=False, format=get_rich_root_format())
 
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        checkout = checkout_branch.bzrdir
 
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        checkout_branch.bind(self)
 
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        # pull up to the specified revision_id to set the initial 
 
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        # branch tip correctly, and seed it with history.
 
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        checkout_branch.pull(self, stop_revision=revision_id)
 
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        return checkout.create_workingtree(revision_id, hardlink=hardlink)
 
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    def _make_tags(self):
 
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        return GitTagDict(self)
 
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    def _gen_revision_history(self):
 
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        if self.head is None:
 
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            return []
 
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        ret = list(self.repository.iter_reverse_revision_history(self.last_revision()))
 
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        ret.reverse()
 
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        return ret
 
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    def get_config(self):
 
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        return GitBranchConfig(self)
 
171
 
 
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    def get_push_location(self):
 
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        """See Branch.get_push_location."""
 
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        push_loc = self.get_config().get_user_option('push_location')
 
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        return push_loc
 
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177
    def set_push_location(self, location):
 
178
        """See Branch.set_push_location."""
 
179
        self.get_config().set_user_option('push_location', location,
 
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                                          store=config.STORE_LOCATION)
 
181
 
 
182
    def supports_tags(self):
 
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        return True
 
184
 
 
185
    def sprout(self, to_bzrdir, revision_id=None):
 
186
        """See Branch.sprout()."""
 
187
        result = to_bzrdir.create_branch()
 
188
        self.copy_content_into(result, revision_id=revision_id)
 
189
        result.set_parent(self.bzrdir.root_transport.base)
 
190
        return result
 
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