/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 Repository and a Bazaar Branch"""

from bzrlib import (

    deprecated_graph,

    inventory,

    repository,

    revision,

    revisiontree,

    urlutils,

    )

from bzrlib.plugins.git import (

    ids,

    model,

    )

class GitRepository(repository.Repository):

    """An adapter to git repositories for bzr."""

    # To make bzrlib happy

    _serializer = None

    def __init__(self, gitdir, lockfiles):

        self.bzrdir = gitdir

        self.control_files = lockfiles

        gitdirectory = gitdir.transport.local_abspath('.')

        self._git = model.GitModel(gitdirectory)

        self._revision_cache = {}

    def _ancestor_revisions(self, revision_ids):

        if revision_ids is not None:

            git_revisions = [gitrevid_from_bzr(r) for r in revision_ids]

        else:

            git_revisions = None

        for lines in self._git.ancestor_lines(git_revisions):

            yield self._parse_rev(lines)

    def is_shared(self):

        return True

    def supports_rich_root(self):

        return False

    def get_revision_graph(self, revision_id=None):

        result = {}

        if revision_id is not None:

            param = [ids.convert_revision_id_bzr_to_git(revision_id)]

        else:

            param = None

        git_graph = self._git.get_revision_graph(param)

        for node, parents in git_graph.iteritems():

            bzr_node = ids.convert_revision_id_git_to_bzr(node)

            bzr_parents = [ids.convert_revision_id_git_to_bzr(n)

                           for n in parents]

            result[bzr_node] = bzr_parents

        return result

    def get_revision_graph_with_ghosts(self, revision_ids=None):

        graph = deprecated_graph.Graph()

        if revision_ids is not None:

            revision_ids = [ids.convert_revision_id_bzr_to_git(r)

                            for r in revision_ids]

        git_graph = self._git.get_revision_graph(revision_ids)

        for node, parents in git_graph.iteritems():

            bzr_node = ids.convert_revision_id_git_to_bzr(node)

            bzr_parents = [ids.convert_revision_id_git_to_bzr(n)

                           for n in parents]

            graph.add_node(bzr_node, bzr_parents)

        return graph

    def get_revision(self, revision_id):

        if revision_id in self._revision_cache:

            return self._revision_cache[revision_id]

        raw = self._git.rev_list(

            [ids.convert_revision_id_bzr_to_git(revision_id)],

            max_count=1, header=True)

        return self._parse_rev(raw)

    def has_revision(self, revision_id):

        try:

            self.get_revision(revision_id)

        except NoSuchRevision:

            return False

        else:

            return True

    def get_revisions(self, revisions):

        return [self.get_revision(r) for r in revisions]

    @classmethod

    def _parse_rev(klass, raw):

        """Parse a single git revision.

        * The first line is the git commit id.

        * Following lines conform to the 'name value' structure, until the

          first blank line.

        * All lines after the first blank line and until the NULL line have 4

          leading spaces and constitute the commit message.

        :param raw: sequence of newline-terminated strings, its last item is a

            single NULL character.

        :return: a `bzrlib.revision.Revision` object.

        """

        parents = []

        message_lines = []

        in_message = False

        committer_was_set = False

        revision_id = ids.convert_revision_id_git_to_bzr(raw[0][:-1])

        rev = revision.Revision(revision_id)

        rev.inventory_sha1 = ""

        assert raw[-1] == '\x00', (

            "Last item of raw was not a single NULL character.")

        for line in raw[1:-1]:

            if in_message:

                assert line[:4] == '    ', (

                    "Unexpected line format in commit message: %r" % line)

                message_lines.append(line[4:])

                continue

            if line == '\n':

                in_message = True

                continue

            name, value = line[:-1].split(' ', 1)

            if name == 'parent':

                rev.parent_ids.append(

                    ids.convert_revision_id_git_to_bzr(value))

                continue

            if name == 'author':

                author, timestamp, timezone = value.rsplit(' ', 2)

                rev.properties['author'] = author

                rev.properties['git-author-timestamp'] = timestamp

                rev.properties['git-author-timezone'] = timezone

                if not committer_was_set:

                    rev.committer = author

                    rev.timestamp = float(timestamp)

                    rev.timezone = klass._parse_tz(timezone)

                continue

            if name == 'committer':

                committer_was_set = True

                committer, timestamp, timezone = value.rsplit(' ', 2)

                rev.committer = committer

                rev.timestamp = float(timestamp)

                rev.timezone = klass._parse_tz(timezone)

                continue

            if name == 'tree':

                rev.properties['git-tree-id'] = value

                continue

        rev.message = ''.join(message_lines)

        return rev

    @classmethod

    def _parse_tz(klass, tz):

        """Parse a timezone specification in the [+|-]HHMM format.

        :return: the timezone offset in seconds.

        """

        assert len(tz) == 5

        sign = {'+': +1, '-': -1}[tz[0]]

        hours = int(tz[1:3])

        minutes = int(tz[3:])

        return float(sign * 60 * (60 * hours + minutes))

    def revision_trees(self, revids):

        for revid in revids:

            yield self.revision_tree(revid)

    def revision_tree(self, revision_id):

        return GitRevisionTree(self, revision_id)

    def get_inventory(self, revision_id):

        if revision_id is None:

            revision_id = revision.NULL_REVISION

        if revision_id == revision.NULL_REVISION:

            return inventory.Inventory(

                revision_id=revision_id, root_id=None)

        git_commit = ids.convert_revision_id_bzr_to_git(revision_id)

        git_inventory = self._git.get_inventory(git_commit)

        return self._parse_inventory(revision_id, git_inventory)

    @classmethod

    def _parse_inventory(klass, revid, git_inv):

        # For now, git inventory do not have root ids. It is not clear that we

        # can reliably support root ids. -- David Allouche 2007-12-28

        inv = inventory.Inventory(revision_id=revid)

        for perms, git_kind, git_id, path in git_inv:

            text_sha1 = None

            executable = False

            if git_kind == 'blob':

                text_sha1 = git_id

                if perms[1] == '0':

                    kind = 'file'

                    executable = bool(int(perms[-3:], 8) & 0111)

                elif perms[1] == '2':

                    kind = 'symlink'

                else:

                    raise AssertionError(

                        "Unknown blob kind, perms=%r." % (perms,))

            elif git_kind == 'tree':

                kind = 'directory'

            else:

                raise AssertionError(

                    "Unknown git entry kind: %r" % (git_kind,))

            # XXX: Maybe the file id should be prefixed by file kind, so when

            # the kind of path changes, the id changes too.

            # -- David Allouche 2007-12-28.

            entry = inv.add_path(path, kind, file_id=path.encode('utf-8'))

            entry.text_sha1 = text_sha1

            entry.executable = executable

        return inv

class GitRevisionTree(revisiontree.RevisionTree):

    def __init__(self, repository, revision_id):

        if revision_id is None:

            revision_id = revision.NULL_REVISION

        self._inventory = repository.get_inventory(revision_id)

        self._repository = repository

        self._revision_id = revision_id

    def get_file_lines(self, file_id):

        obj_id = self._inventory[file_id].text_sha1

        return self._repository._git.cat_file('blob', obj_id)