/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,

    repository,

    revision,

    urlutils,

    )

from bzrlib.plugins.git import (

    ids,

    model,

    )

class GitRepository(repository.Repository):

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

    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 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

        for node, parents in self._git.ancestry(param).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]

        for node, parents in self._git.ancestry(revision_ids).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):

        revision = self.get_revision(revision_id)

        inventory = GitInventory(revision_id)

        tree_id = revision.properties['git-tree-id']

        type_map = {'blob': 'file', 'tree': 'directory' }

        def get_inventory(tree_id, prefix):

            for perms, type, obj_id, name in self._git.get_inventory(tree_id):

                full_path = prefix + name

                if type == 'blob':

                    text_sha1 = obj_id

                else:

                    text_sha1 = None

                executable = (perms[-3] in ('1', '3', '5', '7'))

                entry = GitEntry(full_path, type_map[type], revision_id,

                                 text_sha1, executable)

                inventory.entries[full_path] = entry

                if type == 'tree':

                    get_inventory(obj_id, full_path+'/')

        get_inventory(tree_id, '')

        return inventory

class GitRevisionTree(object):

    def __init__(self, repository, revision_id):

        self.repository = repository

        self.revision_id = revision_id

        self.inventory = repository.get_inventory(revision_id)

    def get_file(self, file_id):

        return iterablefile.IterableFile(self.get_file_lines(file_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)

    def is_executable(self, file_id):

        return self.inventory[file_id].executable

class GitInventory(object):

    def __init__(self, revision_id):

        self.entries = {}

        self.root = GitEntry('', 'directory', revision_id)

        self.entries[''] = self.root

    def __getitem__(self, key):

        return self.entries[key]

    def iter_entries(self):

        return iter(sorted(self.entries.items()))

    def iter_entries_by_dir(self):

        return self.iter_entries()

    def __len__(self):

        return len(self.entries)

class GitEntry(object):

    def __init__(self, path, kind, revision, text_sha1=None, executable=False,

                 text_size=None):

        self.path = path

        self.file_id = path

        self.kind = kind

        self.executable = executable

        self.name = osutils.basename(path)

        if path == '':

            self.parent_id = None

        else:

            self.parent_id = osutils.dirname(path)

        self.revision = revision

        self.symlink_target = None

        self.text_sha1 = text_sha1

        self.text_size = None

    def __repr__(self):

        return "GitEntry(%r, %r, %r, %r)" % (self.path, self.kind,

                                             self.revision, self.parent_id)