/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"""

import os

import bzrlib

from bzrlib import (

    deprecated_graph,

    errors,

    inventory,

    osutils,

    repository,

    revision,

    revisiontree,

    urlutils,

    )

from bzrlib.transport import get_transport

from bzrlib.plugins.git import (

    cache,

    ids,

    model,

    )

cachedbs = {}

class GitRepository(repository.Repository):

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

    _serializer = None

    def __init__(self, gitdir, lockfiles):

        self.bzrdir = gitdir

        self.control_files = lockfiles

        self._git = self._make_model(gitdir.transport)

        self._revision_cache = {}

        self._blob_cache = {}

        self._blob_info_cache = {}

        cache_dir = cache.create_cache_dir()

        cachedir_transport = get_transport(cache_dir)

        cache_file = os.path.join(cache_dir, 'cache-%s' % ids.NAMESPACE)

        if not cachedbs.has_key(cache_file):

            cachedbs[cache_file] = cache.sqlite3.connect(cache_file)

        self.cachedb = cachedbs[cache_file]

        self._init_cachedb()

        self._format = GitFormat()

    def _init_cachedb(self):

        self.cachedb.executescript("""

        create table if not exists inventory (

            revid blob);

        create unique index if not exists inventory_revid

            on inventory (revid);

        create table if not exists entry_revision (

            inventory blob,

            path blob,

            gitid blob,

            executable integer,

            revision blob);

        create unique index if not exists entry_revision_revid_path

            on entry_revision (inventory, path);

        """)

        self.cachedb.commit()

    @classmethod

    def _make_model(klass, transport):

        gitdirectory = transport.local_abspath('.')

        return model.GitModel(gitdirectory)

    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)

        # print "fetched ancestors:", git_revisions

    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)

        # print "fetched 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)

        # print "fetched revision graph (ghosts):", 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_ancestry(self, revision_id):

        param = [ids.convert_revision_id_bzr_to_git(revision_id)]

        git_ancestry = self._git.get_ancestry(param)

        # print "fetched ancestry:", param

        return [None] + [

            ids.convert_revision_id_git_to_bzr(git_id)

            for git_id in git_ancestry]

    def get_signature_text(self, revision_id):

        raise errors.NoSuchRevision(self, revision_id)

    def get_revision(self, revision_id):

        if revision_id in self._revision_cache:

            return self._revision_cache[revision_id]

        git_commit_id = ids.convert_revision_id_bzr_to_git(revision_id)

        raw = self._git.rev_list([git_commit_id], max_count=1, header=True)

        print "fetched revision:", git_commit_id

        revision = self._parse_rev(raw)

        self._revision_cache[revision_id] = revision

        return revision

    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)

        # XXX: That should not be needed, but current revision serializers do

        # not know how how to handle text that is illegal in xml. Note: when

        # this is fixed, we will need to rev up the revision namespace when

        # removing the escaping code. -- David Allouche 2007-12-30

        rev.message = escape_for_xml(rev.message)

        rev.committer = escape_for_xml(rev.committer)

        rev.properties['author'] = escape_for_xml(rev.properties['author'])

        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 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 _fetch_blob(self, git_id):

        lines = self._git.cat_file('blob', git_id)

        print "fetched blob:", git_id

        if self._building_inventory is not None:

            self._building_inventory.git_file_data[git_id] = lines

        return lines

    def _get_blob(self, git_id):

        try:

            return self._blob_cache[git_id]

        except KeyError:

            return self._fetch_blob(git_id)

    def _get_blob_caching(self, git_id):

        try:

            return self._blob_cache[git_id]

        except KeyError:

            lines = self._fetch_blob(git_id)

            self._blob_cache[git_id] = lines

            return lines

    def _get_blob_info(self, git_id):

        try:

            return self._blob_info_cache[git_id]

        except KeyError:

            lines = self._get_blob(git_id)

            size = sum(len(line) for line in lines)

            sha1 = osutils.sha_strings(lines)

            self._blob_info_cache[git_id] = (size, sha1)

            return size, sha1

    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)

        # First pass at building the inventory. We need this one to get the

        # git ids, so we do not have to cache the entire tree text. Ideally,

        # this should be all we need to do.

        git_commit = ids.convert_revision_id_bzr_to_git(revision_id)

        git_inventory = self._git.get_inventory(git_commit)

        # print "fetched inventory:", git_commit

        inv = self._parse_inventory(revision_id, git_inventory)

        # Second pass at building the inventory. There we retrieve additional

        # data that bzrlib requires: text sizes, sha1s, symlink targets and

        # revisions that introduced inventory entries

        self._building_inventory = inv

        self._building_inventory.git_file_data = {}

        for file_id in sorted(inv.git_ids.iterkeys()):

            git_id = inv.git_ids[file_id]

            entry = inv[file_id]

            self._set_entry_text_info(inv, entry, git_id)

        for file_id in sorted(inv.git_ids.iterkeys()):

            git_id = inv.git_ids[file_id]

            entry = inv[file_id]

            path = inv.id2path(file_id)

            self._set_entry_revision(entry, revision_id, path, git_id)

        # At this point the entry_revision table is fully populated for this

        # revision. So record that we have inventory data for this revision.

        self.cachedb.execute(

            "insert or ignore into inventory (revid) values (?)",

            (revision_id,))

        self.cachedb.commit()

        self._building_inventory = None

        return inv

    @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)

        inv.git_ids = {}

        for perms, git_kind, git_id, path in git_inv:

            text_sha1 = None

            executable = False

            if git_kind == 'blob':

                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.

            file_id = escape_file_id(path.encode('utf-8'))

            entry = inv.add_path(path, kind, file_id=file_id)

            entry.executable = executable

            inv.git_ids[file_id] = git_id

        inv.root.revision = revid

        return inv

    def _set_entry_text_info(self, inv, entry, git_id):

        if entry.kind == 'directory':

            return

        size, sha1 = self._get_blob_info(git_id)

        entry.text_size = size

        entry.text_sha1 = sha1

        if entry.kind == 'symlink':

            lines = self._get_blob_caching(git_id)

            entry.symlink_target = ''.join(lines)

    def _get_file_revision(self, revision_id, path):

        lines = self._git.rev_list(

            [ids.convert_revision_id_bzr_to_git(revision_id)],

            max_count=1, topo_order=True, paths=[path])

        [line] = lines

        result = ids.convert_revision_id_git_to_bzr(line[:-1])

        print "fetched file revision", line[:-1], path

        return result

    def _get_entry_revision_from_db(self, revid, path, git_id, executable):

        result = self.cachedb.execute(

            "select revision from entry_revision where"

            " inventory=? and path=? and gitid=? and executable=?",

            (revid, path, git_id, executable)).fetchone()

        if result is None:

            return None

        [revision] = result

        return revision

    def _set_entry_revision_in_db(self, revid, path, git_id, executable, revision):

        self.cachedb.execute(

            "insert into entry_revision"

            " (inventory, path, gitid, executable, revision)"

            " values (?, ?, ?, ?, ?)",

            (revid, path, git_id, executable, revision))

    def _all_inventories_in_db(self, revids):

        for revid in revids:

            result = self.cachedb.execute(

                "select count(*) from inventory where revid = ?",

                (revid,)).fetchone()

            if result is None:

                return False

        return True

    def _set_entry_revision(self, entry, revid, path, git_id):

        # If a revision is in the cache, we assume it contains entries for the

        # whole inventory. So if all parent revisions are in the cache, but no

        # parent entry is present, then the entry revision is the current

        # revision. That amortizes the number of _get_file_revision calls for

        # large pulls to a "small number".

        entry_rev = self._get_entry_revision_from_db(

            revid, path, git_id, entry.executable)

        if entry_rev is not None:

            entry.revision = entry_rev

            return

        revision = self.get_revision(revid)

        for parent_id in revision.parent_ids:

            entry_rev = self._get_entry_revision_from_db(

                parent_id, path, git_id, entry.executable)

            if entry_rev is not None:

                break

        else:

            if self._all_inventories_in_db(revision.parent_ids):

                entry_rev = revid

            else:

                entry_rev = self._get_file_revision(revid, path)

        self._set_entry_revision_in_db(

            revid, path, git_id, entry.executable, entry_rev)

        #self.cachedb.commit()

        entry.revision = entry_rev

def escape_file_id(file_id):

    return file_id.replace('_', '__').replace(' ', '_s')

def escape_for_xml(message):

    """Replace xml-incompatible control characters."""

    # Copied from _escape_commit_message from bzr-svn.

    # -- David Allouche 2007-12-29.

    if message is None:

        return None

    import re

    # FIXME: RBC 20060419 this should be done by the revision

    # serialiser not by commit. Then we can also add an unescaper

    # in the deserializer and start roundtripping revision messages

    # precisely. See repository_implementations/test_repository.py

    # Python strings can include characters that can't be

    # represented in well-formed XML; escape characters that

    # aren't listed in the XML specification

    # (http://www.w3.org/TR/REC-xml/#NT-Char).

    message, _ = re.subn(

        u'[^\x09\x0A\x0D\u0020-\uD7FF\uE000-\uFFFD]+',

        lambda match: match.group(0).encode('unicode_escape'),

        message)

    return message

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):

        entry = self._inventory[file_id]

        if entry.kind == 'directory': return []

        git_id = self._inventory.git_ids[file_id]

        if git_id in self._inventory.git_file_data:

            return self._inventory.git_file_data[git_id]

        return self._repository._get_blob(git_id)

class GitFormat(object):

    supports_tree_reference = False