/brz/remove-bazaar

# Copyright (C) 2008 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 index and a Bazaar Working Tree"""

from cStringIO import (

    StringIO,

    )

from dulwich.index import (

    Index,

    )

from dulwich.objects import (

    Blob,

    )

import os

import stat

from bzrlib import (

    errors,

    inventory,

    lockable_files,

    lockdir,

    osutils,

    transport,

    urlutils,

    workingtree,

    )

from bzrlib.decorators import (

    needs_read_lock,

    needs_write_lock,

    )

def inventory_from_index(basis_inventory, mapping, index):

    inv = inventory.Inventory(root_id=None)

    def add_parents(path):

        dirname, _ = osutils.split(path)

        file_id = inv.path2id(dirname)

        if file_id is None:

            if dirname == "":

                parent_fid = None

            else:

                parent_fid = add_parents(dirname)

            ie = inv.add_path(dirname, 'directory', mapping.generate_file_id(dirname), parent_fid)

            if ie.file_id in basis_inventory:

                ie.revision = basis_inventory[ie.file_id].revision

            file_id = ie.file_id

        return file_id

    for path, value in index.iteritems():

        assert isinstance(path, str)

        assert isinstance(value, tuple) and len(value) == 10

        (ctime, mtime, ino, dev, mode, uid, gid, size, sha, flags) = value

        old_file_id = basis_inventory.path2id(path)

        if old_file_id is None:

            file_id = mapping.generate_file_id(path)

        else:

            file_id = old_file_id

        if stat.S_ISLNK(mode):

            kind = 'symlink'

        else:

            assert stat.S_ISREG(mode)

            kind = 'file'

        ie = inv.add_path(path, kind, file_id, add_parents(path))

        if old_file_id is not None:

            ie.revision = basis_inventory[old_file_id].revision

    return inv

class GitWorkingTree(workingtree.WorkingTree):

    """A Git working tree."""

    def __init__(self, bzrdir, repo, branch):

        self.basedir = bzrdir.root_transport.local_abspath('.')

        self.bzrdir = bzrdir

        self.repository = repo

        self.mapping = self.repository.get_mapping()

        self._branch = branch

        self._transport = bzrdir.transport

        self.controldir = urlutils.join(self.repository._git._controldir, 'bzr')

        try:

            os.makedirs(self.controldir)

            os.makedirs(os.path.join(self.controldir, 'lock'))

        except OSError:

            pass

        self._control_files = lockable_files.LockableFiles(

            transport.get_transport(self.controldir), 'lock', lockdir.LockDir)

        self._format = GitWorkingTreeFormat()

        self.index_path = os.path.join(self.repository._git.controldir(), 

                                       "index")

        self.index = Index(self.index_path)

        self.views = self._make_views()

        self._detect_case_handling()

    def unlock(self):

        # non-implementation specific cleanup

        self._cleanup()

        # reverse order of locking.

        try:

            return self._control_files.unlock()

        finally:

            self.branch.unlock()

    def is_control_filename(self, path):

        return os.path.basename(path) == ".git"

    def _rewrite_index(self):

        self.index.clear()

        for path, entry in self._inventory.iter_entries():

            if entry.kind == "directory":

                # Git indexes don't contain directories

                continue

            if entry.kind == "file":

                blob = Blob()

                try:

                    file, stat_val = self.get_file_with_stat(entry.file_id, path)

                except (errors.NoSuchFile, IOError):

                    # TODO: Rather than come up with something here, use the old index

                    file = StringIO()

                    stat_val = (0, 0, 0, 0, stat.S_IFREG | 0644, 0, 0, 0, 0, 0)

                blob._text = file.read()

            elif entry.kind == "symlink":

                blob = Blob()

                stat_val = os.stat(self.abspath(path))

                blob._text = entry.symlink_target

            # Add object to the repository if it didn't exist yet

            if not blob.id in self.repository._git.object_store:

                self.repository._git.object_store.add_object(blob)

            # Add an entry to the index or update the existing entry

            (mode, ino, dev, links, uid, gid, size, atime, mtime, ctime) = stat_val

            flags = 0

            self.index[path.encode("utf-8")] = (ctime, mtime, ino, dev, mode, uid, gid, size, blob.id, flags)

    def flush(self):

        # TODO: Maybe this should only write on dirty ?

        if self._control_files._lock_mode != 'w':

            raise errors.NotWriteLocked(self)

        self._rewrite_index()           

        self.index.write()

        self._inventory_is_modified = False

    def _reset_data(self):

        self._inventory_is_modified = False

        basis_inv = self.repository.get_inventory(self.mapping.revision_id_foreign_to_bzr(self.repository._git.head()))

        result = inventory_from_index(basis_inv, self.mapping, self.index)

        self._set_inventory(result, dirty=False)

    @needs_read_lock

    def get_file_sha1(self, file_id, path=None, stat_value=None):

        if not path:

            path = self._inventory.id2path(file_id)

        return osutils.sha_file_by_name(self.abspath(path).encode(osutils._fs_enc))

class GitWorkingTreeFormat(workingtree.WorkingTreeFormat):

    def get_format_description(self):

        return "Git Working Tree"