/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,

    bzrdir,

    config,

    errors,

    repository,

    revision,

    tag,

    transport,

    )

from bzrlib.decorators import (

    needs_read_lock,

    )

from bzrlib.trace import (

    is_quiet,

    mutter,

    )

from bzrlib.plugins.git import (

    get_rich_root_format,

    )

from bzrlib.plugins.git.config import (

    GitBranchConfig,

    )

from bzrlib.plugins.git.errors import (

    NoPushSupport,

    NoSuchRef,

    )

try:

    from bzrlib.foreign import ForeignBranch

except ImportError:

    class ForeignBranch(branch.Branch):

        def __init__(self, mapping):

            self.mapping = mapping

            super(ForeignBranch, self).__init__()

def extract_tags(refs, mapping):

    ret = {}

    for k,v in refs.iteritems():

        if k.startswith("refs/tags/") and not k.endswith("^{}"):

            v = refs.get(k+"^{}", v)

            ret[k[len("refs/tags/"):]] = mapping.revision_id_foreign_to_bzr(v)

    return ret

class GitPullResult(branch.PullResult):

    def _lookup_revno(self, revid):

        assert isinstance(revid, str), "was %r" % revid

        # Try in source branch first, it'll be faster

        return self.target_branch.revision_id_to_revno(revid)

    @property

    def old_revno(self):

        return self._lookup_revno(self.old_revid)

    @property

    def new_revno(self):

        return self._lookup_revno(self.new_revid)

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.refs.as_dict("refs/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.refs["refs/tags/%s" % name], _ = \

            self.branch.mapping.revision_id_bzr_to_foreign(revid)

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, lockfiles):

        self.repository = repository

        self._format = GitBranchFormat()

        self.control_files = lockfiles

        self.bzrdir = bzrdir

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

        self.name = name

        self._head = None

        self.base = bzrdir.transport.base

    def _get_nick(self, local=False, possible_master_transports=None):

        """Find the nick name for this branch.

        :return: Branch nick

        """

        return self.name

    def _set_nick(self, nick):

        raise NotImplementedError

    nick = property(_get_nick, _set_nick)

    def __repr__(self):

        return "%s(%r, %r)" % (self.__class__.__name__, self.repository.base, self.name)

    def generate_revision_history(self, revid, old_revid=None):

        # FIXME: Check that old_revid is in the ancestry of revid

        newhead, self.mapping = self.mapping.revision_id_bzr_to_foreign(revid)

        self._set_head(newhead)

    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()."""

        # FIXME: Set "origin" url from .git/config ?

        return None

    def set_parent(self, url):

        # FIXME: Set "origin" url in .git/config ?

        pass

    def lock_read(self):

        self.control_files.lock_read()

    def is_locked(self):

        return self.control_files.is_locked()

    def unlock(self):

        self.control_files.unlock()

    def get_physical_lock_status(self):

        return False

    @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 _basic_push(self, target, overwrite=False, stop_revision=None):

        return branch.InterBranch.get(self, target)._basic_push(

            overwrite, stop_revision)

class LocalGitBranch(GitBranch):

    """A local Git branch."""

    def _get_checkout_format(self):

        """Return the most suitable metadir for a checkout of this branch.

        Weaves are used if this branch's repository uses weaves.

        """

        format = self.repository.bzrdir.checkout_metadir()

        format.set_branch_format(self._format)

        return format

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

        accelerator_tree=None, hardlink=False):

        if lightweight:

            t = transport.get_transport(to_location)

            t.ensure_base()

            format = self._get_checkout_format()

            checkout = format.initialize_on_transport(t)

            from_branch = branch.BranchReferenceFormat().initialize(checkout, 

                self)

            tree = checkout.create_workingtree(revision_id,

                from_branch=from_branch, hardlink=hardlink)

            return tree

        else:

            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.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_head(self):

        try:

            return self.repository._git.ref(self.name)

        except KeyError:

            return None

    def set_last_revision_info(self, revno, revid):

        self.set_last_revision(revid)

    def set_last_revision(self, revid):

        (newhead, self.mapping) = self.mapping.revision_id_bzr_to_foreign(

                revid)

        self.head = newhead

    def _set_head(self, value):

        self._head = value

        self.repository._git.refs[self.name] = self._head

        self._clear_cached_state()

    head = property(_get_head, _set_head)

    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 GitBranchPullResult(branch.PullResult):

    def report(self, to_file):

        if not is_quiet():

            if self.old_revid == self.new_revid:

                to_file.write('No revisions to pull.\n')

            else:

                to_file.write('Now on revision %d (git sha: %s).\n' % 

                        (self.new_revno, self.new_git_head))

        self._show_tag_conficts(to_file)

class GitBranchPushResult(branch.BranchPushResult):

    def _lookup_revno(self, revid):

        assert isinstance(revid, str), "was %r" % revid

        # Try in source branch first, it'll be faster

        try:

            return self.source_branch.revision_id_to_revno(revid)

        except errors.NoSuchRevision:

            # FIXME: Check using graph.find_distance_to_null() ?

            return self.target_branch.revision_id_to_revno(revid)

    @property

    def old_revno(self):

        return self._lookup_revno(self.old_revid)

    @property

    def new_revno(self):

        return self._lookup_revno(self.new_revid)

class InterFromGitBranch(branch.GenericInterBranch):

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

    @classmethod

    def is_compatible(self, source, target):

        return (isinstance(source, GitBranch) and 

                not isinstance(target, GitBranch))

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

        graph=None):

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

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

            self.target.repository)

        self._head = None

        self._last_revid = None

        def determine_wants(heads):

            if not self.source.name in heads:

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

            if stop_revision is not None:

                self._last_revid = stop_revision

                self._head, mapping = self.source.repository.lookup_git_revid(

                    stop_revision)

            else:

                self._head = heads[self.source.name]

                self._last_revid = \

                    self.source.mapping.revision_id_foreign_to_bzr(self._head)

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

                return []

            return [self._head]

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

        if overwrite:

            prev_last_revid = None

        else:

            prev_last_revid = self.target.last_revision()

        self.target.generate_revision_history(self._last_revid, prev_last_revid)

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

             possible_transports=None, _hook_master=None, run_hooks=True,

             _override_hook_target=None, local=False):

        """See Branch.pull.

        :param _hook_master: Private parameter - set the branch to

            be supplied as the master to pull hooks.

        :param run_hooks: Private parameter - if false, this branch

            is being called because it's the master of the primary branch,

            so it should not run its hooks.

        :param _override_hook_target: Private parameter - set the branch to be

            supplied as the target_branch to pull hooks.

        """

        # This type of branch can't be bound.

        if local:

            raise errors.LocalRequiresBoundBranch()

        result = GitBranchPullResult()

        result.source_branch = self.source

        if _override_hook_target is None:

            result.target_branch = self.target

        else:

            result.target_branch = _override_hook_target

        self.source.lock_read()

        try:

            # We assume that during 'pull' the target repository is closer than

            # the source one.

            graph = self.target.repository.get_graph(self.source.repository)

            result.old_revno, result.old_revid = \

                self.target.last_revision_info()

            self.update_revisions(stop_revision, overwrite=overwrite, 

                graph=graph)

            result.new_git_head = self._head

            result.tag_conflicts = self.source.tags.merge_to(self.target.tags,

                overwrite)

            result.new_revno, result.new_revid = self.target.last_revision_info()

            if _hook_master:

                result.master_branch = _hook_master

                result.local_branch = result.target_branch

            else:

                result.master_branch = result.target_branch

                result.local_branch = None

            if run_hooks:

                for hook in branch.Branch.hooks['post_pull']:

                    hook(result)

        finally:

            self.source.unlock()

        return result

    def _basic_push(self, overwrite=False, stop_revision=None):

        result = branch.BranchPushResult()

        result.source_branch = self.source

        result.target_branch = self.target

        graph = self.target.repository.get_graph(self.source.repository)

        result.old_revno, result.old_revid = self.target.last_revision_info()

        self.update_revisions(stop_revision, overwrite=overwrite, 

            graph=graph)

        result.new_git_head = self._head

        result.tag_conflicts = self.source.tags.merge_to(self.target.tags,

            overwrite)

        result.new_revno, result.new_revid = self.target.last_revision_info()

        return result

class InterGitBranch(branch.GenericInterBranch):

    """InterBranch implementation that pulls between Git branches."""

class InterGitLocalRemoteBranch(InterGitBranch):

    """InterBranch that copies from a local to a remote git branch."""

    @classmethod

    def is_compatible(self, source, target):

        from bzrlib.plugins.git.remote import RemoteGitBranch

        return (isinstance(source, LocalGitBranch) and 

                isinstance(target, RemoteGitBranch))

    def _basic_push(self, overwrite=False, stop_revision=None):

        result = GitBranchPushResult()

        result.source_branch = self.source

        result.target_branch = self.target

        if stop_revision is None:

            stop_revision = self.source.last_revision()

        # FIXME: Check for diverged branches

        def get_changed_refs(old_refs):

            result.old_revid = self.target.mapping.revision_id_foreign_to_bzr(old_refs.get("refs/heads/master", "0" * 40))

            refs = { "refs/heads/master": self.source.repository.lookup_git_revid(stop_revision)[0] }

            result.new_revid = stop_revision

            for name, sha in self.source.repository._git.refs.as_dict("refs/tags").iteritems():

                refs["refs/tags/%s" % name] = sha

            return refs

        self.target.repository.send_pack(get_changed_refs, 

                self.source.repository._git.object_store.generate_pack_contents)

        return result

class InterGitRemoteLocalBranch(InterGitBranch):

    """InterBranch that copies from a remote to a local git branch."""

    @classmethod

    def is_compatible(self, source, target):

        from bzrlib.plugins.git.remote import RemoteGitBranch

        return (isinstance(source, RemoteGitBranch) and 

                isinstance(target, LocalGitBranch))

    def _basic_push(self, overwrite=False, stop_revision=None):

        result = branch.BranchPushResult()

        result.source_branch = self.source

        result.target_branch = self.target

        result.old_revid = self.target.last_revision()

        refs, stop_revision = self.update_refs(stop_revision)

        self.target.generate_revision_history(stop_revision, result.old_revid)

        self.update_tags(refs)

        result.new_revid = self.target.last_revision()

        return result

    def update_tags(self, refs):

        for name, revid in extract_tags(refs, self.target.mapping).iteritems():

            self.target.tags.set_tag(name, revid)

    def update_refs(self, stop_revision=None):

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

            self.target.repository)

        if stop_revision is None:

            refs = interrepo.fetch_refs(branches=["HEAD"])

            stop_revision = self.target.mapping.revision_id_foreign_to_bzr(refs["HEAD"])

        else:

            refs = interrepo.fetch_refs(revision_id=stop_revision)

        return refs, stop_revision

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

        possible_transports=None, local=False):

        # This type of branch can't be bound.

        if local:

            raise errors.LocalRequiresBoundBranch()

        result = GitPullResult()

        result.source_branch = self.source

        result.target_branch = self.target

        result.old_revid = self.target.last_revision()

        refs, stop_revision = self.update_refs(stop_revision)

        self.target.generate_revision_history(stop_revision, result.old_revid)

        self.update_tags(refs)

        result.new_revid = self.target.last_revision()

        return result

class InterToGitBranch(branch.InterBranch):

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

    @classmethod

    def is_compatible(self, source, target):

        return (not isinstance(source, GitBranch) and 

                isinstance(target, GitBranch))

    def update_revisions(self, *args, **kwargs):

        raise NoPushSupport()

    def push(self, overwrite=True, stop_revision=None, 

             _override_hook_source_branch=None):

        raise NoPushSupport()

    def lossy_push(self, stop_revision=None):

        result = GitBranchPushResult()

        result.source_branch = self.source

        result.target_branch = self.target

        result.old_revid = self.target.last_revision()

        if stop_revision is None:

            stop_revision = self.source.last_revision()

        # FIXME: Check for diverged branches

        refs = { "refs/heads/master": stop_revision }

        for name, revid in self.source.tags.get_tag_dict().iteritems():

            if self.source.repository.has_revision(revid):

                refs["refs/tags/%s" % name] = revid

        revidmap, new_refs = self.target.repository.dfetch_refs(

            self.source.repository, refs)

        if revidmap != {}:

            self.target.generate_revision_history(revidmap[stop_revision])

            result.new_revid = revidmap[stop_revision]

        else:

            result.new_revid = result.old_revid

        result.revidmap = revidmap

        return result

branch.InterBranch.register_optimiser(InterGitRemoteLocalBranch)

branch.InterBranch.register_optimiser(InterFromGitBranch)

branch.InterBranch.register_optimiser(InterToGitBranch)

branch.InterBranch.register_optimiser(InterGitLocalRemoteBranch)