/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 import (

    bzrdir,

    errors as bzr_errors,

    lockable_files,

    urlutils,

    version_info as bzrlib_version,

    )

LockWarner = getattr(lockable_files, "_LockWarner", None)

from bzrlib.plugins.git import (

    LocalGitBzrDirFormat,

    get_rich_root_format,

    )

class GitLock(object):

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

    def lock_write(self, token=None):

        pass

    def lock_read(self):

        pass

    def unlock(self):

        pass

    def peek(self):

        pass

    def validate_token(self, token):

        pass

    def break_lock(self):

        pass

class GitLockableFiles(lockable_files.LockableFiles):

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

    def __init__(self, transport, lock):

        self._lock = lock

        self._transaction = None

        self._lock_mode = None

        self._transport = transport

        if LockWarner is None:

            # Bzr 1.13

            self._lock_count = 0

        else:

            self._lock_warner = LockWarner(repr(self))

class GitDir(bzrdir.BzrDir):

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

    def is_supported(self):

        return True

    def cloning_metadir(self, stacked=False):

        return get_rich_root_format(stacked)

    def _branch_name_to_ref(self, name):

        raise NotImplementedError(self._branch_name_to_ref)

    if bzrlib_version >= (2, 2):

        def open_branch(self, name=None, ignore_fallbacks=None,

            unsupported=False):

            return self._open_branch(name=name,

                ignore_fallbacks=ignore_fallbacks, unsupported=unsupported)

    else:

        def open_branch(self, ignore_fallbacks=None, unsupported=False):

            return self._open_branch(name=None,

                ignore_fallbacks=ignore_fallbacks, unsupported=unsupported)

class LocalGitDir(GitDir):

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

    def _get_gitrepository_class(self):

        from bzrlib.plugins.git.repository import LocalGitRepository

        return LocalGitRepository

    _gitrepository_class = property(_get_gitrepository_class)

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

        self._format = format

        self.root_transport = transport

        self._git = gitrepo

        if gitrepo.bare:

            self.transport = transport

        else:

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

        self._lockfiles = lockfiles

        self._mode_check_done = None

    def _branch_name_to_ref(self, name):

        from bzrlib.plugins.git.branch import branch_name_to_ref

        if name in (None, "HEAD"):

            from dulwich.repo import SYMREF

            refcontents = self._git.refs.read_ref("HEAD")

            if refcontents.startswith(SYMREF):

                name = refcontents[len(SYMREF):]

            else:

                name = "HEAD"

        return branch_name_to_ref(name, "HEAD")

    def is_control_filename(self, filename):

        return filename == '.git' or filename.startswith('.git/')

    def get_branch_transport(self, branch_format):

        if branch_format is None:

            return self.transport

        if isinstance(branch_format, LocalGitBzrDirFormat):

            return self.transport

        raise bzr_errors.IncompatibleFormat(branch_format, self._format)

    get_repository_transport = get_branch_transport

    get_workingtree_transport = get_branch_transport

    def _open_branch(self, name=None, ignore_fallbacks=None, unsupported=False):

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

        repo = self.open_repository()

        from bzrlib.plugins.git.branch import LocalGitBranch

        return LocalGitBranch(self, repo, self._branch_name_to_ref(name),

            self._lockfiles)

    def destroy_branch(self, name=None):

        del self._git.refs[self._branch_name_to_ref(name)]

    def list_branches(self):

        ret = []

        for name in self._git.get_refs():

            if name.startswith("refs/heads/"):

                ret.append(self.open_branch(name=name))

        return ret

    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):

        if not self._git.bare:

            from dulwich.errors import NoIndexPresent

            repo = self.open_repository()

            try:

                index = repo._git.open_index()

            except NoIndexPresent:

                pass

            else:

                from bzrlib.plugins.git.workingtree import GitWorkingTree

                return GitWorkingTree(self, repo, self.open_branch(), index)

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

        raise bzr_errors.NoWorkingTree(loc)

    def create_repository(self, shared=False):

        return self.open_repository()

    def create_branch(self, name=None):

        refname = self._branch_name_to_ref(name)

        self._git.refs[refname] = "0" * 40

        return self.open_branch(name)

    def backup_bzrdir(self):

        if self._git.bare:

            self.root_transport.copy_tree(".git", ".git.backup")

            return (self.root_transport.abspath(".git"),

                    self.root_transport.abspath(".git.backup"))

        else:

            raise bzr_errors.BzrError("Unable to backup bare repositories")

    def create_workingtree(self, revision_id=None, from_branch=None,

        accelerator_tree=None, hardlink=False):

        if self._git.bare:

            raise bzr_errors.BzrError("Can't create working tree in a bare repo")

        from dulwich.index import write_index

        from dulwich.pack import SHA1Writer

        f = open(self.transport.local_abspath("index"), 'w+')

        try:

            f = SHA1Writer(f)

            write_index(f, [])

        finally:

            f.close()

        return self.open_workingtree()