/brz/remove-bazaar

# Copyright (C) 2007 Canonical Ltd

#

# 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 control dir and a Bazaar BzrDir"""

from bzrlib.lazy_import import lazy_import

from bzrlib import (

    bzrdir,

    lockable_files,

    urlutils,

    )

lazy_import(globals(), """

from bzrlib.plugins.git import (

    errors,

    git_branch,

    git_repository,

    )

""")

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(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(bzrdir.BzrDir):

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

    _gitrepository_class = git_repository.GitRepository

    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.bzr_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):

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

        repo = self.open_repository()

        if repo._git.heads == []:

            head = None

        else:

            head = repo._git.heads[0].commit.id

        return git_branch.GitBranch(self, repo, head, 

                                    self.root_transport.base, self._lockfiles)

    def open_repository(self, shared=False):

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

        return self._gitrepository_class(self, self._lockfiles)

    def open_workingtree(self, recommend_upgrade=True):

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

        raise errors.bzr_errors.NoWorkingTree(loc)

    def cloning_metadir(self):

        return bzrdir.BzrDirFormat.get_default_format()

class GitBzrDirFormat(bzrdir.BzrDirFormat):

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

    _gitdir_class = GitDir

    @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 not transport.has('.git'):

            raise errors.bzr_errors.NotBranchError(path=transport.base)

        lockfiles = GitLockableFiles(GitLock())

        return self._gitdir_class(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()

        # 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.bzr_errors.NotBranchError(path=transport.base)

        raise errors.bzr_errors.NotBranchError(path=transport.base)

bzrdir.BzrDirFormat.register_control_format(GitBzrDirFormat)