/brz/remove-bazaar

# Copyright (C) 2008 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

from bzrlib.bzrdir import BzrDir

from bzrlib.repository import Repository

from bzrlib.inventory import InventoryDirectory, InventoryFile

from bzrlib.osutils import splitpath

from bzrlib.plugins.git.fetch import import_git_objects

from bzrlib.plugins.git.mapping import default_mapping

from dulwich.server import Backend

from dulwich.pack import Pack, PackData, write_pack_index_v2

from dulwich.objects import ShaFile, Commit, Tree, Blob

import os, tempfile

# FIXME: Remove this in favor of something in the mapping...

_mode = -1

def get_umask():

    global _mode

    if _mode == -1:

        _mode = os.umask(0)

        os.umask(_mode)

    return _mode

class BzrBackend(Backend):

    def __init__(self, directory):

        self.directory = directory

        self.mapping = default_mapping

    def get_refs(self):

        """ return a dict of all tags and branches in repository (and shas) """

        ret = {}

        repo_dir = BzrDir.open(self.directory)

        repo = repo_dir.open_repository()

        for branch in repo.find_branches(using=True):

            #FIXME: Need to get branch path relative to its repository and use this instead of nick

            ret["refs/heads/"+branch.nick] = self.mapping.revision_id_bzr_to_foreign(branch.last_revision())

        return ret

    def apply_pack(self, refs, read):

        """ apply pack from client to current repository """

        fd, path = tempfile.mkstemp(suffix=".pack")

        f = os.fdopen(fd, 'w')

        f.write(read())

        f.close()

        p = PackData(path)

        entries = p.sorted_entries()

        write_pack_index_v2(path[:-5]+".idx", entries, p.calculate_checksum())

        def get_objects():

            pack = Pack(path[:-5])

            for obj in pack.iterobjects():

                yield obj

        target = Repository.open(self.directory)

        target.lock_write()

        try:

            target.start_write_group()

            try:

                import_git_objects(target, self.mapping, iter(get_objects()))

            finally:

                target.commit_write_group()

        finally:

            target.unlock()

        for oldsha, sha, ref in refs:

            if ref[:11] == 'refs/heads/':

                branch_nick = ref[11:]

                try:

                    target_dir = BzrDir.open(self.directory + "/" + branch_nick)

                except:

                    target_dir = BzrDir.create(self.directory + "/" + branch_nick)

                try:

                    target_branch = target_dir.open_branch()

                except:

                    target_branch = target_dir.create_branch()

                rev_id = self.mapping.revision_id_foreign_to_bzr(sha)

                target_branch.generate_revision_history(rev_id)

    def fetch_objects(self, determine_wants, graph_walker, progress):

        """ yield git objects to send to client """

        wants = determine_wants(self.get_refs())

        commits_to_send = set([self.mapping.revision_id_foreign_to_bzr(w) for w in wants])

        rev_done = set()

        obj_sent = set()

        repo = Repository.open(self.directory)

        repo.lock_read()

        try:

            have = graph_walker.next()

            while have:

                rev_done.add(have)

                if repo.has_revision(self.mapping.revision_id_foregin_to_bzr(sha)):

                    graph_walker.ack(have)

                have = graph_walker.next()

            while commits_to_send:

                commit = commits_to_send.pop()

                if commit in rev_done:

                    continue

                rev_done.add(commit)

                rev = repo.get_revision(commit)

                commits_to_send.update([p for p in rev.parent_ids if not p in rev_done])

                for sha, obj in inventory_to_tree_and_blobs(repo, self.mapping, commit):

                    if sha not in obj_sent:

                        obj_sent.add(sha)

                        yield obj

                yield revision_to_commit(rev, self.mapping, sha)

        finally:

            repo.unlock()

def revision_to_commit(rev, mapping, tree_sha):

    """

    Turn a Bazaar revision in to a Git commit

    :param tree_sha: HACK parameter (until we can retrieve this from the mapping)

    :return dulwich.objects.Commit represent the revision:

    """

    commit = Commit()

    commit._tree = tree_sha

    for p in rev.parent_ids:

        commit._parents.append(mapping.revision_id_bzr_to_foreign(p))

    commit._message = rev.message

    commit._committer = rev.committer

    if 'author' in rev.properties:

        commit._author = rev.properties['author']

    else:

        commit._author = rev.committer

    commit._commit_time = rev.timestamp

    commit.serialize()

    print commit.sha().hexdigest()

    return commit

def inventory_to_tree_and_blobs(repo, mapping, revision_id):

    stack = []

    cur = ""

    tree = Tree()

    inv = repo.get_inventory(revision_id)

    for path, entry in inv.iter_entries():

        while stack and not path.startswith(cur):

            tree.serialize()

            sha = tree.sha().hexdigest()

            yield sha, tree

            t = (get_umask(), splitpath(cur)[-1:][0].encode('UTF-8'), sha)

            cur, tree = stack.pop()

            tree.add(*t)

        if type(entry) == InventoryDirectory:

            stack.append((cur, tree))

            cur = path

            tree = Tree()

        if type(entry) == InventoryFile:

            #FIXME: We can make potentially make this Lazy to avoid shaing lots of stuff

            # and having all these objects in memory at once

            blob = Blob()

            _, blob._text = repo.iter_files_bytes([(entry.file_id, revision_id, path)]).next()

            sha = blob.sha().hexdigest()

            yield sha, blob

            name = splitpath(path)[-1:][0].encode('UTF-8')

            mode = get_umask()

            tree.add(mode, name, sha)

    while len(stack) > 1:

        tree.serialize()

        sha = tree.sha().hexdigest()

        yield sha, tree

        t = (get_umask(), splitpath(cur)[-1:][0].encode('UTF-8'), sha)

        cur, tree = stack.pop()

        tree.add(*t)

    tree.serialize()

    yield tree.sha().hexdigest(), tree