/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 git

import os

import time

import bzrlib

from bzrlib import (

    deprecated_graph,

    errors,

    inventory,

    osutils,

    repository,

    revision,

    revisiontree,

    urlutils,

    versionedfile,

    )

from bzrlib.transport import get_transport

from bzrlib.plugins.git import (

    cache,

    ids,

    )

cachedbs = {}

class GitRepository(repository.Repository):

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

    _serializer = None

    def __init__(self, gitdir, lockfiles):

        self.base = gitdir.root_transport.base

        self.bzrdir = gitdir

        self.control_files = lockfiles

        self._git = git.repo.Repo(gitdir.root_transport.local_abspath("."))

        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.texts = None

        self.signatures = versionedfile.VirtualSignatureTexts(self)

        self.revisions = None

        self._format = GitFormat()

        self._fallback_repositories = []

    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()

    def is_shared(self):

        return True

    def supports_rich_root(self):

        return False

    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 has_signature_for_revision_id(self, revision_id):

        return False

    def get_parent_map(self, revision_ids):

        ret = {}

        for revid in revision_ids:

            commit = self._git.commit(ids.convert_revision_id_bzr_to_git(revid))

            ret[revid] = tuple([ids.convert_revision_id_git_to_bzr(p.id) for p in commit.parents])

        return ret

    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)

        commit = self._git.commit(git_commit_id)

        # print "fetched revision:", git_commit_id

        revision = self._parse_rev(commit)

        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, commit):

        """Convert a git commit to a bzr revision.

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

        """

        rev = revision.Revision(ids.convert_revision_id_git_to_bzr(commit.id))

        rev.parent_ids = tuple([ids.convert_revision_id_git_to_bzr(p.id) for p in commit.parents])

        rev.inventory_sha1 = ""

        rev.message = commit.message

        rev.committer = str(commit.committer)

        rev.properties['author'] = str(commit.author)

        rev.timestamp = time.mktime(commit.committed_date)

        rev.timezone = 0

        return rev

    def revision_trees(self, revids):

        for revid in revids:

            yield self.revision_tree(revid)

    def revision_tree(self, revision_id):

        revision_id = revision.ensure_null(revision_id)

        if revision_id == revision.NULL_REVISION:

            inv = inventory.Inventory(root_id=None)

            inv.revision_id = revision_id

            return revisiontree.RevisionTree(self, inv, 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):

        assert revision_id != None

        return self.revision_tree(revision_id).inventory

    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')

class GitRevisionTree(revisiontree.RevisionTree):

    def __init__(self, repository, revision_id):

        self._repository = repository

        self.revision_id = revision_id

        git_id = ids.convert_revision_id_bzr_to_git(revision_id)

        self.tree = repository._git.commit(git_id).tree

        self._inventory = inventory.Inventory(revision_id=revision_id)

        self._inventory.root.revision = revision_id

        self._build_inventory(self.tree, self._inventory.root, "")

    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)

    def _build_inventory(self, tree, ie, path):

        assert isinstance(path, str)

        for b in tree.contents:

            basename = b.name.decode("utf-8")

            if path == "":

                child_path = b.name

            else:

                child_path = urlutils.join(path, b.name)

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

            if b.mode[0] == '0':

                child_ie = inventory.InventoryDirectory(file_id, basename, ie.file_id)

            elif b.mode[0] == '1':

                if b.mode[1] == '0':

                    child_ie = inventory.InventoryFile(file_id, basename, ie.file_id)

                    child_ie.text_sha1 = osutils.sha_string(b.data)

                elif b.mode[1] == '2':

                    child_ie = inventory.InventoryLink(file_id, basename, ie.file_id)

                    child_ie.text_sha1 = osutils.sha_string("")

                else:

                    raise AssertionError(

                        "Unknown file kind, perms=%r." % (b.mode,))

                child_ie.text_size = b.size

            else:

                raise AssertionError(

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

            child_ie.executable = bool(int(b.mode[3:], 8) & 0111)

            child_ie.revision = self.revision_id

            assert not basename in ie.children

            ie.children[basename] = child_ie

            if b.mode[0] == '0':

                self._build_inventory(b, child_ie, child_path)

class GitFormat(object):

    supports_tree_reference = False