/brz/remove-bazaar

# Copyright (C) 2007 Canonical Ltd

# Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>

#

# 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 __future__ import absolute_import

from ... import (

    check,

    errors,

    graph as _mod_graph,

    repository,

    revision,

    transactions,

    ui,

    version_info as breezy_version,

    )

from ...bzr import (

    inventory,

    inventorytree,

    )

from ...decorators import only_raises

from ...foreign import (

    ForeignRepository,

    )

from .commit import (

    GitCommitBuilder,

    )

from .filegraph import (

    GitFileLastChangeScanner,

    GitFileParentProvider,

    )

from .mapping import (

    default_mapping,

    foreign_vcs_git,

    mapping_registry,

    )

from .tree import (

    GitRevisionTree,

    )

from dulwich.errors import (

    NotCommitError,

    )

from dulwich.objects import (

    Commit,

    ZERO_SHA,

    )

from dulwich.object_store import (

    tree_lookup_path,

    )

class RepoReconciler(object):

    """Reconciler that reconciles a repository.

    """

    def __init__(self, repo, other=None, thorough=False):

        """Construct a RepoReconciler.

        :param thorough: perform a thorough check which may take longer but

                         will correct non-data loss issues such as incorrect

                         cached data.

        """

        self.repo = repo

    def reconcile(self):

        """Perform reconciliation.

        After reconciliation the following attributes document found issues:

        inconsistent_parents: The number of revisions in the repository whose

                              ancestry was being reported incorrectly.

        garbage_inventories: The number of inventory objects without revisions

                             that were garbage collected.

        """

class GitCheck(check.Check):

    def __init__(self, repository, check_repo=True):

        self.repository = repository

        self.checked_rev_cnt = 0

    def check(self, callback_refs=None, check_repo=True):

        if callback_refs is None:

            callback_refs = {}

        self.repository.lock_read()

        self.repository.unlock()

    def report_results(self, verbose):

        pass

_optimisers_loaded = False

def lazy_load_optimisers():

    global _optimisers_loaded

    if _optimisers_loaded:

        return

    from . import fetch, push

    for optimiser in [fetch.InterRemoteGitNonGitRepository,

                      fetch.InterLocalGitNonGitRepository,

                      fetch.InterGitGitRepository,

                      push.InterToLocalGitRepository,

                      push.InterToRemoteGitRepository]:

        repository.InterRepository.register_optimiser(optimiser)

    _optimisers_loaded = True

class GitRepository(ForeignRepository):

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

    _serializer = None

    vcs = foreign_vcs_git

    chk_bytes = None

    def __init__(self, gitdir):

        self._transport = gitdir.root_transport

        super(GitRepository, self).__init__(GitRepositoryFormat(),

            gitdir, control_files=None)

        self.base = gitdir.root_transport.base

        lazy_load_optimisers()

        self._lock_mode = None

        self._lock_count = 0

    def add_fallback_repository(self, basis_url):

        raise errors.UnstackableRepositoryFormat(self._format,

            self.control_transport.base)

    def is_shared(self):

        return False

    def get_physical_lock_status(self):

        return False

    def lock_write(self):

        """See Branch.lock_write()."""

        if self._lock_mode:

            assert self._lock_mode == 'w'

            self._lock_count += 1

        else:

            self._lock_mode = 'w'

            self._lock_count = 1

        return GitRepositoryLock(self)

    def break_lock(self):

        raise NotImplementedError(self.break_lock)

    def dont_leave_lock_in_place(self):

        raise NotImplementedError(self.dont_leave_lock_in_place)

    def leave_lock_in_place(self):

        raise NotImplementedError(self.leave_lock_in_place)

    def lock_read(self):

        if self._lock_mode:

            assert self._lock_mode in ('r', 'w')

            self._lock_count += 1

        else:

            self._lock_mode = 'r'

            self._lock_count = 1

        return self

    @only_raises(errors.LockNotHeld, errors.LockBroken)

    def unlock(self):

        if self._lock_count == 0:

            raise errors.LockNotHeld(self)

        if self._lock_count == 1 and self._lock_mode == 'w':

            if self._write_group is not None:

                self.abort_write_group()

                self._lock_count -= 1

                self._lock_mode = None

                raise errors.BzrError(

                    'Must end write groups before releasing write locks.')

        self._lock_count -= 1

        if self._lock_count == 0:

            self._lock_mode = None

    def is_write_locked(self):

        return (self._lock_mode == 'w')

    def is_locked(self):

        return (self._lock_mode is not None)

    def get_transaction(self):

        """See Repository.get_transaction()."""

        if self._write_group is None:

            return transactions.PassThroughTransaction()

        else:

            return self._write_group

    def reconcile(self, other=None, thorough=False):

        """Reconcile this repository."""

        reconciler = RepoReconciler(self, thorough=thorough)

        reconciler.reconcile()

        return reconciler

    def supports_rich_root(self):

        return True

    def get_mapping(self):

        return default_mapping

    def make_working_trees(self):

        return not self._git.get_config().get_boolean(("core", ), "bare")

    def revision_graph_can_have_wrong_parents(self):

        return False

    def add_signature_text(self, revid, signature):

        raise errors.UnsupportedOperation(self.add_signature_text, self)

    def sign_revision(self, revision_id, gpg_strategy):

        raise errors.UnsupportedOperation(self.add_signature_text, self)

class GitRepositoryLock(object):

    """Subversion lock."""

    def __init__(self, repository):

        self.repository_token = None

        self.repository = repository

    def unlock(self):

        self.repository.unlock()

class LocalGitRepository(GitRepository):

    """Git repository on the file system."""

    def __init__(self, gitdir):

        GitRepository.__init__(self, gitdir)

        self._git = gitdir._git

        self._file_change_scanner = GitFileLastChangeScanner(self)

    def get_commit_builder(self, branch, parents, config, timestamp=None,

                           timezone=None, committer=None, revprops=None,

                           revision_id=None, lossy=False):

        """Obtain a CommitBuilder for this repository.

        :param branch: Branch to commit to.

        :param parents: Revision ids of the parents of the new revision.

        :param config: Configuration to use.

        :param timestamp: Optional timestamp recorded for commit.

        :param timezone: Optional timezone for timestamp.

        :param committer: Optional committer to set for commit.

        :param revprops: Optional dictionary of revision properties.

        :param revision_id: Optional revision id.

        :param lossy: Whether to discard data that can not be natively

            represented, when pushing to a foreign VCS

        """

        self.start_write_group()

        return GitCommitBuilder(self, parents, config,

            timestamp, timezone, committer, revprops, revision_id,

            lossy)

    def get_file_graph(self):

        return _mod_graph.Graph(GitFileParentProvider(

            self._file_change_scanner))

    def iter_files_bytes(self, desired_files):

        """Iterate through file versions.

        Files will not necessarily be returned in the order they occur in

        desired_files.  No specific order is guaranteed.

        Yields pairs of identifier, bytes_iterator.  identifier is an opaque

        value supplied by the caller as part of desired_files.  It should

        uniquely identify the file version in the caller's context.  (Examples:

        an index number or a TreeTransform trans_id.)

        bytes_iterator is an iterable of bytestrings for the file.  The

        kind of iterable and length of the bytestrings are unspecified, but for

        this implementation, it is a list of bytes produced by

        VersionedFile.get_record_stream().

        :param desired_files: a list of (file_id, revision_id, identifier)

            triples

        """

        per_revision = {}

        for (file_id, revision_id, identifier) in desired_files:

            per_revision.setdefault(revision_id, []).append(

                (file_id, identifier))

        for revid, files in per_revision.iteritems():

            (commit_id, mapping) = self.lookup_bzr_revision_id(revid)

            try:

                commit = self._git.object_store[commit_id]

            except KeyError:

                raise errors.RevisionNotPresent(revid, self)

            root_tree = commit.tree

            for fileid, identifier in files:

                path = mapping.parse_file_id(fileid)

                try:

                    obj = tree_lookup_path(

                        self._git.object_store.__getitem__, root_tree, path)

                    if isinstance(obj, tuple):

                        (mode, item_id) = obj

                        obj = self._git.object_store[item_id]

                except KeyError:

                    raise errors.RevisionNotPresent((fileid, revid), self)

                else:

                    if obj.type_name == "tree":

                        yield (identifier, [])

                    elif obj.type_name == "blob":

                        yield (identifier, obj.chunked)

                    else:

                        raise AssertionError("file text resolved to %r" % obj)

    def gather_stats(self, revid=None, committers=None):

        """See Repository.gather_stats()."""

        result = super(LocalGitRepository, self).gather_stats(revid, committers)

        revs = []

        for sha in self._git.object_store:

            o = self._git.object_store[sha]

            if o.type_name == "commit":

                revs.append(o.id)

        result['revisions'] = len(revs)

        return result

    def _iter_revision_ids(self):

        mapping = self.get_mapping()

        for sha in self._git.object_store:

            o = self._git.object_store[sha]

            if not isinstance(o, Commit):

                continue

            rev, roundtrip_revid, verifiers = mapping.import_commit(o,

                mapping.revision_id_foreign_to_bzr)

            yield o.id, rev.revision_id, roundtrip_revid

    def all_revision_ids(self):

        ret = set([])

        for git_sha, revid, roundtrip_revid in self._iter_revision_ids():

            if roundtrip_revid:

                ret.add(roundtrip_revid)

            else:

                ret.add(revid)

        return ret

    def _get_parents(self, revid, no_alternates=False):

        if type(revid) != str:

            raise ValueError

        try:

            (hexsha, mapping) = self.lookup_bzr_revision_id(revid)

        except errors.NoSuchRevision:

            return None

        # FIXME: Honor no_alternates setting

        try:

            commit = self._git.object_store[hexsha]

        except KeyError:

            return None

        return [

            self.lookup_foreign_revision_id(p, mapping)

            for p in commit.parents]

    def _get_parent_map_no_fallbacks(self, revids):

        return self.get_parent_map(revids, no_alternates=True)

    def get_parent_map(self, revids, no_alternates=False):

        parent_map = {}

        for revision_id in revids:

            parents = self._get_parents(revision_id, no_alternates=no_alternates)

            if revision_id == revision.NULL_REVISION:

                parent_map[revision_id] = ()

                continue

            if parents is None:

                continue

            if len(parents) == 0:

                parents = [revision.NULL_REVISION]

            parent_map[revision_id] = tuple(parents)

        return parent_map

    def get_known_graph_ancestry(self, revision_ids):

        """Return the known graph for a set of revision ids and their ancestors.

        """

        pending = set(revision_ids)

        parent_map = {}

        while pending:

            this_parent_map = {}

            for revid in pending:

                if revid == revision.NULL_REVISION:

                    continue

                parents = self._get_parents(revid)

                if parents is not None:

                    this_parent_map[revid] = parents

            parent_map.update(this_parent_map)

            pending = set()

            map(pending.update, this_parent_map.itervalues())

            pending = pending.difference(parent_map)

        return _mod_graph.KnownGraph(parent_map)

    def get_signature_text(self, revision_id):

        raise errors.NoSuchRevision(self, revision_id)

    def check(self, revision_ids=None, callback_refs=None, check_repo=True):

        result = GitCheck(self, check_repo=check_repo)

        result.check(callback_refs)

        return result

    def pack(self, hint=None, clean_obsolete_packs=False):

        self._git.object_store.pack_loose_objects()

    def lookup_foreign_revision_id(self, foreign_revid, mapping=None):

        """Lookup a revision id.

        :param foreign_revid: Foreign revision id to look up

        :param mapping: Mapping to use (use default mapping if not specified)

        :raise KeyError: If foreign revision was not found

        :return: bzr revision id

        """

        assert type(foreign_revid) is str

        if mapping is None:

            mapping = self.get_mapping()

        if foreign_revid == ZERO_SHA:

            return revision.NULL_REVISION

        commit = self._git.object_store.peel_sha(foreign_revid)

        if not isinstance(commit, Commit):

            raise NotCommitError(commit.id)

        rev, roundtrip_revid, verifiers = mapping.import_commit(commit,

            mapping.revision_id_foreign_to_bzr)

        # FIXME: check testament before doing this?

        if roundtrip_revid:

            return roundtrip_revid

        else:

            return rev.revision_id

    def has_signature_for_revision_id(self, revision_id):

        """Check whether a GPG signature is present for this revision.

        This is never the case for Git repositories.

        """

        return False

    def lookup_bzr_revision_id(self, bzr_revid, mapping=None):

        """Lookup a bzr revision id in a Git repository.

        :param bzr_revid: Bazaar revision id

        :param mapping: Optional mapping to use

        :return: Tuple with git commit id, mapping that was used and supplement

            details

        """

        try:

            (git_sha, mapping) = mapping_registry.revision_id_bzr_to_foreign(bzr_revid)

        except errors.InvalidRevisionId:

            if mapping is None:

                mapping = self.get_mapping()

            try:

                return (self._git.refs[mapping.revid_as_refname(bzr_revid)],

                        mapping)

            except KeyError:

                # Update refs from Git commit objects

                # FIXME: Hitting this a lot will be very inefficient...

                pb = ui.ui_factory.nested_progress_bar()

                try:

                    for i, (git_sha, revid, roundtrip_revid) in enumerate(self._iter_revision_ids()):

                        if not roundtrip_revid:

                            continue

                        pb.update("resolving revision id", i)

                        refname = mapping.revid_as_refname(roundtrip_revid)

                        self._git.refs[refname] = git_sha

                        if roundtrip_revid == bzr_revid:

                            return git_sha, mapping

                finally:

                    pb.finished()

                raise errors.NoSuchRevision(self, bzr_revid)

        else:

            return (git_sha, mapping)

    def get_revision(self, revision_id):

        if not isinstance(revision_id, str):

            raise errors.InvalidRevisionId(revision_id, self)

        git_commit_id, mapping = self.lookup_bzr_revision_id(revision_id)

        try:

            commit = self._git.object_store[git_commit_id]

        except KeyError:

            raise errors.NoSuchRevision(self, revision_id)

        revision, roundtrip_revid, verifiers = mapping.import_commit(

            commit, self.lookup_foreign_revision_id)

        assert revision is not None

        # FIXME: check verifiers ?

        if roundtrip_revid:

            revision.revision_id = roundtrip_revid

        return revision

    def has_revision(self, revision_id):

        """See Repository.has_revision."""

        if revision_id == revision.NULL_REVISION:

            return True

        try:

            git_commit_id, mapping = self.lookup_bzr_revision_id(revision_id)

        except errors.NoSuchRevision:

            return False

        return (git_commit_id in self._git)

    def has_revisions(self, revision_ids):

        """See Repository.has_revisions."""

        return set(filter(self.has_revision, revision_ids))

    def iter_revisions(self, revision_ids):

        """See Repository.get_revisions."""

        for revid in revision_ids:

            try:

                rev = self.get_revision(revid)

            except errors.NoSuchRevision:

                rev = None

            yield (revid, rev)

    def revision_trees(self, revids):

        """See Repository.revision_trees."""

        for revid in revids:

            yield self.revision_tree(revid)

    def revision_tree(self, revision_id):

        """See Repository.revision_tree."""

        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 inventorytree.InventoryRevisionTree(self, inv, revision_id)

        return GitRevisionTree(self, revision_id)

    def get_inventory(self, revision_id):

        raise NotImplementedError(self.get_inventory)

    def set_make_working_trees(self, trees):

        if trees:

            self._git.get_config().set(("core", ), "bare", "false")

        else:

            self._git.get_config().set(("core", ), "bare", "true")

    def fetch_objects(self, determine_wants, graph_walker, resolve_ext_ref,

        progress=None):

        return self._git.fetch_objects(determine_wants, graph_walker, progress)

class GitRepositoryFormat(repository.RepositoryFormat):

    """Git repository format."""

    supports_versioned_directories = False

    supports_tree_reference = False

    rich_root_data = True

    supports_leaving_lock = False

    fast_deltas = True

    supports_funky_characters = True

    supports_external_lookups = False

    supports_full_versioned_files = False

    supports_revision_signatures = False

    supports_nesting_repositories = False

    revision_graph_can_have_wrong_parents = False

    supports_unreferenced_revisions = True

    @property

    def _matchingbzrdir(self):

        from .dir import LocalGitControlDirFormat

        return LocalGitControlDirFormat()

    def get_format_description(self):

        return "Git Repository"

    def initialize(self, controldir, shared=False, _internal=False):

        from .dir import GitDir

        if not isinstance(controldir, GitDir):

            raise errors.UninitializableFormat(self)

        return controldir.open_repository()

    def check_conversion_target(self, target_repo_format):

        return target_repo_format.rich_root_data

    def get_foreign_tests_repository_factory(self):

        from .tests.test_repository import (

            ForeignTestsRepositoryFactory,

            )

        return ForeignTestsRepositoryFactory()

    def network_name(self):

        return "git"