/brz/remove-bazaar

# Copyright (C) 2008 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

from cStringIO import (

    StringIO,

    )

import dulwich as git

from dulwich.client import (

    SimpleFetchGraphWalker,

    )

from dulwich.objects import (

    Commit,

    Tag,

    )

from bzrlib import (

    osutils,

    trace,

    ui,

    urlutils,

    )

from bzrlib.errors import (

    InvalidRevisionId,

    NoSuchRevision,

    )

from bzrlib.inventory import (

    Inventory,

    InventoryDirectory,

    InventoryFile,

    InventoryLink,

    )

from bzrlib.lru_cache import (

    LRUCache,

    )

from bzrlib.repository import (

    InterRepository,

    )

from bzrlib.revision import (

    NULL_REVISION,

    )

from bzrlib.tsort import (

    topo_sort,

    )

from bzrlib.plugins.git.converter import (

    GitObjectConverter,

    )

from bzrlib.plugins.git.repository import (

    LocalGitRepository, 

    GitRepository, 

    GitRepositoryFormat,

    )

from bzrlib.plugins.git.remote import (

    RemoteGitRepository,

    )

class BzrFetchGraphWalker(object):

    """GraphWalker implementation that uses a Bazaar repository."""

    def __init__(self, repository, mapping):

        self.repository = repository

        self.mapping = mapping

        self.done = set()

        self.heads = set(repository.all_revision_ids())

        self.parents = {}

    def __iter__(self):

        return iter(self.next, None)

    def ack(self, sha):

        revid = self.mapping.revision_id_foreign_to_bzr(sha)

        self.remove(revid)

    def remove(self, revid):

        self.done.add(revid)

        if revid in self.heads:

            self.heads.remove(revid)

        if revid in self.parents:

            for p in self.parents[revid]:

                self.remove(p)

    def next(self):

        while self.heads:

            ret = self.heads.pop()

            ps = self.repository.get_parent_map([ret])[ret]

            self.parents[ret] = ps

            self.heads.update([p for p in ps if not p in self.done])

            try:

                self.done.add(ret)

                return self.mapping.revision_id_bzr_to_foreign(ret)[0]

            except InvalidRevisionId:

                pass

        return None

def import_git_blob(texts, mapping, path, blob, base_inv, parent_id, 

    revision_id, parent_invs, shagitmap, executable):

    """Import a git blob object into a bzr repository.

    :param texts: VersionedFiles to add to

    :param path: Path in the tree

    :param blob: A git blob

    :return: Inventory delta for this file

    """

    file_id = mapping.generate_file_id(path)

    # We just have to hope this is indeed utf-8:

    ie = InventoryFile(file_id, urlutils.basename(path).decode("utf-8"), 

        parent_id)

    ie.text_size = len(blob.data)

    ie.text_sha1 = osutils.sha_string(blob.data)

    ie.executable = executable

    # If there were no changes compared to the base inventory, there's no need 

    # for a delta

    if (file_id in base_inv and 

        base_inv[file_id].parent_id == ie.parent_id and

        base_inv[file_id].text_sha1 == ie.text_sha1 and

        base_inv[file_id].executable == ie.executable):

        return []

    # Check what revision we should store

    parent_keys = []

    for pinv in parent_invs:

        if not file_id in pinv:

            continue

        if pinv[file_id].text_sha1 == ie.text_sha1:

            # found a revision in one of the parents to use

            ie.revision = pinv[file_id].revision

            break

        parent_keys.append((file_id, pinv[file_id].revision))

    if ie.revision is None:

        # Need to store a new revision

        ie.revision = revision_id

        assert file_id is not None

        assert ie.revision is not None

        texts.add_lines((file_id, ie.revision), parent_keys,

            osutils.split_lines(blob.data))

        shagitmap.add_entry(blob.sha().hexdigest(), "blob",

            (ie.file_id, ie.revision))

    if file_id in base_inv:

        old_path = base_inv.id2path(file_id)

    else:

        old_path = None

    return [(old_path, path, file_id, ie)]

def import_git_tree(texts, mapping, path, tree, base_inv, parent_id, 

    revision_id, parent_invs, shagitmap, lookup_object):

    """Import a git tree object into a bzr repository.

    :param texts: VersionedFiles object to add to

    :param path: Path in the tree

    :param tree: A git tree object

    :param base_inv: Base inventory against which to return inventory delta

    :return: Inventory delta for this subtree

    """

    ret = []

    file_id = mapping.generate_file_id(path)

    # We just have to hope this is indeed utf-8:

    ie = InventoryDirectory(file_id, urlutils.basename(path.decode("utf-8")), 

        parent_id)

    if not file_id in base_inv:

        # Newly appeared here

        ie.revision = revision_id

        texts.add_lines((file_id, ie.revision), [], [])

        ret.append((None, path, file_id, ie))

    else:

        # See if this has changed at all

        try:

            base_sha = shagitmap.lookup_tree(path, base_inv.revision_id)

        except KeyError:

            pass

        else:

            if base_sha == tree.id:

                # If nothing has changed since the base revision, we're done

                return []

    # Remember for next time

    existing_children = set()

    shagitmap.add_entry(tree.id, "tree", (file_id, revision_id))

    for mode, name, hexsha in tree.entries():

        entry_kind = (mode & 0700000) / 0100000

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

        existing_children.add(basename)

        if path == "":

            child_path = name

        else:

            child_path = urlutils.join(path, name)

        obj = lookup_object(hexsha)

        if entry_kind == 0:

            ret.extend(import_git_tree(texts, mapping, child_path, obj, base_inv, 

                file_id, revision_id, parent_invs, shagitmap, lookup_object))

        elif entry_kind == 1:

            fs_mode = mode & 0777

            ret.extend(import_git_blob(texts, mapping, child_path, obj, base_inv, 

                file_id, revision_id, parent_invs, shagitmap, 

                bool(fs_mode & 0111)))

        else:

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

    # Remove any children that have disappeared

    if file_id in base_inv:

        deletable = [v for k,v in base_inv[file_id].children.iteritems() if k not in existing_children]

        while deletable:

            ie = deletable.pop()

            ret.append((base_inv.id2path(ie.file_id), None, ie.file_id, None))

            if ie.kind == "directory":

                deletable.extend(ie.children.values())

    return ret

def import_git_objects(repo, mapping, object_iter, target_git_object_retriever, 

        heads, pb=None):

    """Import a set of git objects into a bzr repository.

    :param repo: Bazaar repository

    :param mapping: Mapping to use

    :param object_iter: Iterator over Git objects.

    """

    # TODO: a more (memory-)efficient implementation of this

    graph = []

    root_trees = {}

    revisions = {}

    checked = set()

    heads = list(heads)

    parent_invs_cache = LRUCache(50)

    # Find and convert commit objects

    while heads:

        if pb is not None:

            pb.update("finding revisions to fetch", len(graph), None)

        head = heads.pop()

        assert isinstance(head, str)

        o = object_iter[head]

        if isinstance(o, Commit):

            rev = mapping.import_commit(o)

            if repo.has_revision(rev.revision_id):

                continue

            root_trees[rev.revision_id] = o.tree

            revisions[rev.revision_id] = rev

            graph.append((rev.revision_id, rev.parent_ids))

            target_git_object_retriever._idmap.add_entry(o.sha().hexdigest(),

                "commit", (rev.revision_id, o._tree))

            heads.extend([p for p in o.parents if p not in checked])

        elif isinstance(o, Tag):

            heads.append(o.object[1])

        else:

            trace.warning("Unable to import head object %r" % o)

        checked.add(head)

    # Order the revisions

    # Create the inventory objects

    for i, revid in enumerate(topo_sort(graph)):

        if pb is not None:

            pb.update("fetching revisions", i, len(graph))

        root_tree = object_iter[root_trees[revid]]

        rev = revisions[revid]

        # We have to do this here, since we have to walk the tree and 

        # we need to make sure to import the blobs / trees with the right 

        # path; this may involve adding them more than once.

        def lookup_object(sha):

            try:

                return object_iter[sha]

            except KeyError:

                return target_git_object_retriever[sha]

        parent_invs = []

        for parent_id in rev.parent_ids:

            try:

                parent_invs.append(parent_invs_cache[parent_id])

            except KeyError:

                parent_inv = repo.get_inventory(parent_id)

                parent_invs.append(parent_inv)

                parent_invs_cache[parent_id] = parent_inv

        if parent_invs == []:

            base_inv = Inventory(root_id=None)

        else:

            base_inv = parent_invs[0]

        inv_delta = import_git_tree(repo.texts, mapping, "", root_tree, 

            base_inv, None, revid, parent_invs, 

            target_git_object_retriever._idmap, lookup_object)

        try:

            basis_id = rev.parent_ids[0]

        except IndexError:

            basis_id = NULL_REVISION

        rev.inventory_sha1, inv = repo.add_inventory_by_delta(basis_id,

                  inv_delta, rev.revision_id, rev.parent_ids)

        parent_invs_cache[rev.revision_id] = inv

        repo.add_revision(rev.revision_id, rev)

    target_git_object_retriever._idmap.commit()

class InterGitNonGitRepository(InterRepository):

    """InterRepository that copies revisions from a Git into a non-Git 

    repository."""

    _matching_repo_format = GitRepositoryFormat()

    @staticmethod

    def _get_repo_format_to_test():

        return None

    def copy_content(self, revision_id=None, pb=None):

        """See InterRepository.copy_content."""

        self.fetch(revision_id, pb, find_ghosts=False)

    def fetch_objects(self, determine_wants, mapping, pb=None):

        def progress(text):

            pb.update("git: %s" % text.rstrip("\r\n"), 0, 0)

        graph_walker = BzrFetchGraphWalker(self.target, mapping)

        create_pb = None

        if pb is None:

            create_pb = pb = ui.ui_factory.nested_progress_bar()

        target_git_object_retriever = GitObjectConverter(self.target, mapping)

        recorded_wants = []

        def record_determine_wants(heads):

            wants = determine_wants(heads)

            recorded_wants.extend(wants)

            return wants

        try:

            self.target.lock_write()

            try:

                self.target.start_write_group()

                try:

                    objects_iter = self.source.fetch_objects(

                                record_determine_wants, 

                                graph_walker, 

                                target_git_object_retriever.__getitem__, 

                                progress)

                    import_git_objects(self.target, mapping, objects_iter, 

                            target_git_object_retriever, recorded_wants, pb)

                finally:

                    self.target.commit_write_group()

            finally:

                self.target.unlock()

        finally:

            if create_pb:

                create_pb.finished()

    def fetch(self, revision_id=None, pb=None, find_ghosts=False, mapping=None,

            fetch_spec=None):

        self.fetch_refs(revision_id=revision_id, pb=pb, find_ghosts=find_ghosts,

                mapping=mapping, fetch_spec=fetch_spec)

    def fetch_refs(self, revision_id=None, pb=None, find_ghosts=False, 

              mapping=None, fetch_spec=None):

        if mapping is None:

            mapping = self.source.get_mapping()

        if revision_id is not None:

            interesting_heads = [revision_id]

        elif fetch_spec is not None:

            interesting_heads = fetch_spec.heads

        else:

            interesting_heads = None

        self._refs = {}

        def determine_wants(refs):

            self._refs = refs

            if interesting_heads is None:

                ret = [sha for (ref, sha) in refs.iteritems() if not ref.endswith("^{}")]

            else:

                ret = [mapping.revision_id_bzr_to_foreign(revid)[0] for revid in interesting_heads]

            return [rev for rev in ret if not self.target.has_revision(mapping.revision_id_foreign_to_bzr(rev))]

        self.fetch_objects(determine_wants, mapping, pb)

        return self._refs

    @staticmethod

    def is_compatible(source, target):

        """Be compatible with GitRepository."""

        # FIXME: Also check target uses VersionedFile

        return (isinstance(source, GitRepository) and 

                target.supports_rich_root() and

                not isinstance(target, GitRepository))

class InterGitRepository(InterRepository):

    """InterRepository that copies between Git repositories."""

    _matching_repo_format = GitRepositoryFormat()

    @staticmethod

    def _get_repo_format_to_test():

        return None

    def copy_content(self, revision_id=None, pb=None):

        """See InterRepository.copy_content."""

        self.fetch(revision_id, pb, find_ghosts=False)

    def fetch(self, revision_id=None, pb=None, find_ghosts=False, 

              mapping=None, fetch_spec=None):

        if mapping is None:

            mapping = self.source.get_mapping()

        def progress(text):

            trace.info("git: %s", text)

        r = self.target._git

        if revision_id is not None:

            args = [mapping.revision_id_bzr_to_foreign(revision_id)[0]]

        elif fetch_spec is not None:

            args = [mapping.revision_id_bzr_to_foreign(revid)[0] for revid in fetch_spec.heads]

        if fetch_spec is None and revision_id is None:

            determine_wants = r.object_store.determine_wants_all

        else:

            determine_wants = lambda x: [y for y in args if not y in r.object_store]

        graphwalker = SimpleFetchGraphWalker(r.heads().values(), r.get_parents)

        f, commit = r.object_store.add_pack()

        try:

            self.source._git.fetch_pack(path, determine_wants, graphwalker, f.write, progress)

            f.close()

            commit()

        except:

            f.close()

            raise

    @staticmethod

    def is_compatible(source, target):

        """Be compatible with GitRepository."""

        return (isinstance(source, GitRepository) and 

                isinstance(target, GitRepository))