/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 dulwich.objects import (

    Commit,

    Tag,

    Tree,

    S_ISGITLINK,

    )

from dulwich.object_store import (

    tree_lookup_path,

    )

from itertools import (

    imap,

    )

import posixpath

import re

import stat

from bzrlib import (

    debug,

    osutils,

    trace,

    ui,

    )

from bzrlib.errors import (

    BzrError,

    NoSuchId,

    )

from bzrlib.inventory import (

    Inventory,

    InventoryDirectory,

    InventoryFile,

    InventoryLink,

    TreeReference,

    )

from bzrlib.repository import (

    InterRepository,

    )

from bzrlib.revision import (

    NULL_REVISION,

    )

from bzrlib.revisiontree import (

    RevisionTree,

    )

from bzrlib.tsort import (

    topo_sort,

    )

from bzrlib.versionedfile import (

    ChunkedContentFactory,

    )

from bzrlib.plugins.git.mapping import (

    DEFAULT_FILE_MODE,

    mode_is_executable,

    mode_kind,

    squash_revision,

    warn_unusual_mode,

    )

from bzrlib.plugins.git.object_store import (

    BazaarObjectStore,

    LRUTreeCache,

    _tree_to_objects,

    )

from bzrlib.plugins.git.remote import (

    RemoteGitRepository,

    )

from bzrlib.plugins.git.repository import (

    GitRepository,

    GitRepositoryFormat,

    LocalGitRepository,

    )

def import_git_blob(texts, mapping, path, name, (base_hexsha, hexsha), 

        base_inv, parent_id, revision_id,

        parent_invs, lookup_object, (base_mode, mode), store_updater,

        lookup_file_id):

    """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

    """

    if base_hexsha == hexsha and base_mode == mode:

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

        return []

    file_id = lookup_file_id(path)

    if stat.S_ISLNK(mode):

        cls = InventoryLink

    else:

        cls = InventoryFile

    ie = cls(file_id, name.decode("utf-8"), parent_id)

    ie.executable = mode_is_executable(mode)

    if base_hexsha == hexsha and mode_kind(base_mode) == mode_kind(mode):

        base_ie = base_inv[base_inv.path2id(path)]

        ie.text_size = base_ie.text_size

        ie.text_sha1 = base_ie.text_sha1

        ie.symlink_target = base_ie.symlink_target

        if ie.executable == base_ie.executable:

            ie.revision = base_ie.revision

        else:

            blob = lookup_object(hexsha)

    else:

        blob = lookup_object(hexsha)

        if ie.kind == "symlink":

            ie.revision = None

            ie.symlink_target = blob.data

            ie.text_size = None

            ie.text_sha1 = None

        else:

            ie.text_size = sum(imap(len, blob.chunked))

            ie.text_sha1 = osutils.sha_strings(blob.chunked)

    # Check what revision we should store

    parent_keys = []

    for pinv in parent_invs[1:]:

        try:

            pie = pinv[file_id]

        except NoSuchId:

            continue

        if pie.text_sha1 == ie.text_sha1 and pie.executable == ie.executable and pie.symlink_target == ie.symlink_target:

            # found a revision in one of the parents to use

            ie.revision = pie.revision

            break

        parent_keys.append((file_id, pie.revision))

    if ie.revision is None:

        # Need to store a new revision

        ie.revision = revision_id

        assert ie.revision is not None

        if ie.kind == 'symlink':

            chunks = []

        else: 

            chunks = blob.chunked

        texts.insert_record_stream([ChunkedContentFactory((file_id, ie.revision), tuple(parent_keys), ie.text_sha1, chunks)])

    invdelta = []

    if base_hexsha is not None:

        old_path = path # Renames are not supported yet

        if stat.S_ISDIR(base_mode):

            invdelta.extend(remove_disappeared_children(base_inv, old_path,

                lookup_object(base_hexsha), [], lookup_object))

    else:

        old_path = None

    invdelta.append((old_path, path, file_id, ie))

    if base_hexsha != hexsha:

        store_updater.add_object(blob, ie)

    return invdelta

class SubmodulesRequireSubtrees(BzrError):

    _fmt = """The repository you are fetching from contains submodules. To continue, upgrade your Bazaar repository to a format that supports nested trees, such as 'development-subtree'."""

    internal = False

def import_git_submodule(texts, mapping, path, name, (base_hexsha, hexsha),

    base_inv, parent_id, revision_id, parent_invs, lookup_object,

    (base_mode, mode), store_updater, lookup_file_id):

    if base_hexsha == hexsha and base_mode == mode:

        return [], {}

    file_id = lookup_file_id(path)

    ie = TreeReference(file_id, name.decode("utf-8"), parent_id)

    ie.revision = revision_id

    if base_hexsha is None:

        oldpath = None

    else:

        oldpath = path

    ie.reference_revision = mapping.revision_id_foreign_to_bzr(hexsha)

    texts.insert_record_stream([ChunkedContentFactory((file_id, ie.revision), (), None, [])])

    invdelta = [(oldpath, path, file_id, ie)]

    return invdelta, {}

def remove_disappeared_children(base_inv, path, base_tree, existing_children,

        lookup_object):

    ret = []

    for name, mode, hexsha in base_tree.iteritems():

        if name in existing_children:

            continue

        c_path = posixpath.join(path, name.decode("utf-8"))

        ret.append((c_path, None, base_inv.path2id(c_path), None))

        if stat.S_ISDIR(mode):

            ret.extend(remove_disappeared_children(

                base_inv, c_path, lookup_object(hexsha), [], lookup_object))

    return ret

def import_git_tree(texts, mapping, path, name, (base_hexsha, hexsha),

        base_inv, parent_id, revision_id, parent_invs,

        lookup_object, (base_mode, mode), store_updater,

        lookup_file_id, allow_submodules=False):

    """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

    """

    if base_hexsha == hexsha and base_mode == mode:

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

        return [], {}

    invdelta = []

    file_id = lookup_file_id(path)

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

    ie = InventoryDirectory(file_id, name.decode("utf-8"), parent_id)

    tree = lookup_object(hexsha)

    if base_hexsha is None:

        base_tree = None

        old_path = None # Newly appeared here

    else:

        base_tree = lookup_object(base_hexsha)

        old_path = path # Renames aren't supported yet

    if base_tree is None or type(base_tree) is not Tree:

        ie.revision = revision_id

        invdelta.append((old_path, path, ie.file_id, ie))

        texts.insert_record_stream([ChunkedContentFactory((ie.file_id, ie.revision), (), None, [])])

    # Remember for next time

    existing_children = set()

    child_modes = {}

    for child_mode, name, child_hexsha in tree.entries():

        existing_children.add(name)

        child_path = posixpath.join(path, name)

        if type(base_tree) is Tree:

            try:

                child_base_mode, child_base_hexsha = base_tree[name]

            except KeyError:

                child_base_hexsha = None

                child_base_mode = 0

        else:

            child_base_hexsha = None

            child_base_mode = 0

        if stat.S_ISDIR(child_mode):

            subinvdelta, grandchildmodes = import_git_tree(

                    texts, mapping, child_path, name,

                    (child_base_hexsha, child_hexsha),

                    base_inv, file_id, revision_id, parent_invs, lookup_object,

                    (child_base_mode, child_mode), store_updater, 

                    lookup_file_id, allow_submodules=allow_submodules)

        elif S_ISGITLINK(child_mode): # submodule

            if not allow_submodules:

                raise SubmodulesRequireSubtrees()

            subinvdelta, grandchildmodes = import_git_submodule(

                    texts, mapping, child_path, name,

                    (child_base_hexsha, child_hexsha),

                    base_inv, file_id, revision_id, parent_invs, lookup_object,

                    (child_base_mode, child_mode), store_updater,

                    lookup_file_id)

        else:

            subinvdelta = import_git_blob(texts, mapping,

                    child_path, name, (child_base_hexsha, child_hexsha),

                    base_inv, file_id, revision_id, parent_invs, lookup_object,

                    (child_base_mode, child_mode), store_updater,

                    lookup_file_id)

            grandchildmodes = {}

        child_modes.update(grandchildmodes)

        invdelta.extend(subinvdelta)

        if child_mode not in (stat.S_IFDIR, DEFAULT_FILE_MODE,

                        stat.S_IFLNK, DEFAULT_FILE_MODE|0111):

            child_modes[child_path] = child_mode

    # Remove any children that have disappeared

    if base_tree is not None and type(base_tree) is Tree:

        invdelta.extend(remove_disappeared_children(base_inv, old_path, 

            base_tree, existing_children, lookup_object))

    store_updater.add_object(tree, ie)

    return invdelta, child_modes

def verify_commit_reconstruction(target_git_object_retriever, lookup_object,

    o, rev, ret_tree, parent_trees, mapping, unusual_modes):

    new_unusual_modes = mapping.export_unusual_file_modes(rev)

    if new_unusual_modes != unusual_modes:

        raise AssertionError("unusual modes don't match: %r != %r" % (

            unusual_modes, new_unusual_modes))

    # Verify that we can reconstruct the commit properly

    rec_o = target_git_object_retriever._reconstruct_commit(rev, o.tree)

    if rec_o != o:

        raise AssertionError("Reconstructed commit differs: %r != %r" % (

            rec_o, o))

    diff = []

    new_objs = {}

    for path, obj, ie in _tree_to_objects(ret_tree, parent_trees,

        target_git_object_retriever._cache.idmap, unusual_modes):

        old_obj_id = tree_lookup_path(lookup_object, o.tree, path)[1]

        new_objs[path] = obj

        if obj.id != old_obj_id:

            diff.append((path, lookup_object(old_obj_id), obj))

    for (path, old_obj, new_obj) in diff:

        while (old_obj.type_name == "tree" and

               new_obj.type_name == "tree" and

               sorted(old_obj) == sorted(new_obj)):

            for name in old_obj:

                if old_obj[name][0] != new_obj[name][0]:

                    raise AssertionError("Modes for %s differ: %o != %o" % (path, old_obj[name][0], new_obj[name][0]))

                if old_obj[name][1] != new_obj[name][1]:

                    # Found a differing child, delve deeper

                    path = posixpath.join(path, name)

                    old_obj = lookup_object(old_obj[name][1])

                    new_obj = new_objs[path]

                    break

        raise AssertionError("objects differ for %s: %r != %r" % (path,

            old_obj, new_obj))

def import_git_commit(repo, mapping, head, lookup_object,

                      target_git_object_retriever, trees_cache):

    o = lookup_object(head)

    rev = mapping.import_commit(o)

    # 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.

    parent_trees = trees_cache.revision_trees(rev.parent_ids)

    if parent_trees == []:

        base_inv = Inventory(root_id=None)

        base_tree = None

        base_mode = None

    else:

        base_inv = parent_trees[0].inventory

        base_tree = lookup_object(o.parents[0]).tree

        base_mode = stat.S_IFDIR

    store_updater = target_git_object_retriever._get_updater(rev)

    store_updater.add_object(o, None)

    inv_delta, unusual_modes = import_git_tree(repo.texts,

            mapping, "", u"", (base_tree, o.tree), base_inv, 

            None, rev.revision_id, [p.inventory for p in parent_trees],

            lookup_object, (base_mode, stat.S_IFDIR), store_updater,

            mapping.generate_file_id,

            allow_submodules=getattr(repo._format, "supports_tree_reference", False))

    store_updater.finish()

    if unusual_modes != {}:

        for path, mode in unusual_modes.iteritems():

            warn_unusual_mode(rev.foreign_revid, path, mode)

        mapping.import_unusual_file_modes(rev, unusual_modes)

    try:

        basis_id = rev.parent_ids[0]

    except IndexError:

        basis_id = NULL_REVISION

        base_inv = None

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

              inv_delta, rev.revision_id, rev.parent_ids,

              base_inv)

    ret_tree = RevisionTree(repo, inv, rev.revision_id)

    trees_cache.add(ret_tree)

    repo.add_revision(rev.revision_id, rev)

    if "verify" in debug.debug_flags:

        verify_commit_reconstruction(target_git_object_retriever, 

            lookup_object, o, rev, ret_tree, parent_trees, mapping,

            unusual_modes)

def import_git_objects(repo, mapping, object_iter,

    target_git_object_retriever, heads, pb=None, limit=None):

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

    :param repo: Target Bazaar repository

    :param mapping: Mapping to use

    :param object_iter: Iterator over Git objects.

    :return: Tuple with pack hints and last imported revision id

    """

    def lookup_object(sha):

        try:

            return object_iter[sha]

        except KeyError:

            return target_git_object_retriever[sha]

    graph = []

    checked = set()

    heads = list(set(heads))

    trees_cache = LRUTreeCache(repo)

    # 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)

        try:

            o = lookup_object(head)

        except KeyError:

            continue

        if isinstance(o, Commit):

            rev = mapping.import_commit(o)

            if repo.has_revision(rev.revision_id):

                continue

            squash_revision(repo, rev)

            graph.append((o.id, o.parents))

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

        elif isinstance(o, Tag):

            if o.object[1] not in checked:

                heads.append(o.object[1])

        else:

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

        checked.add(o.id)

    del checked

    # Order the revisions

    # Create the inventory objects

    batch_size = 1000

    revision_ids = topo_sort(graph)

    pack_hints = []

    if limit is not None:

        revision_ids = revision_ids[:limit]

    last_imported = None

    for offset in range(0, len(revision_ids), batch_size):

        target_git_object_retriever.start_write_group() 

        try:

            repo.start_write_group()

            try:

                for i, head in enumerate(

                    revision_ids[offset:offset+batch_size]):

                    if pb is not None:

                        pb.update("fetching revisions", offset+i,

                                  len(revision_ids))

                    import_git_commit(repo, mapping, head, lookup_object,

                                      target_git_object_retriever,

                                      trees_cache)

                    last_imported = head

            except:

                repo.abort_write_group()

                raise

            else:

                hint = repo.commit_write_group()

                if hint is not None:

                    pack_hints.extend(hint)

        except:

            target_git_object_retriever.abort_write_group()

            raise

        else:

            target_git_object_retriever.commit_write_group()

    return pack_hints, last_imported

class InterGitRepository(InterRepository):

    _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):

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

            find_ghosts=find_ghosts, mapping=mapping, fetch_spec=fetch_spec)

class InterGitNonGitRepository(InterGitRepository):

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

    repository."""

    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 if revid not in (None, NULL_REVISION)]

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

        (pack_hint, _) = self.fetch_objects(determine_wants, mapping, pb)

        if pack_hint is not None and self.target._format.pack_compresses:

            self.target.pack(hint=pack_hint)

        if interesting_heads is not None:

            present_interesting_heads = self.target.has_revisions(interesting_heads)

            missing_interesting_heads = set(interesting_heads) - present_interesting_heads

            if missing_interesting_heads:

                raise AssertionError("Missing interesting heads: %r" % missing_interesting_heads)

        return self._refs

_GIT_PROGRESS_RE = re.compile(r"(.*?): +(\d+)% \((\d+)/(\d+)\)")

def report_git_progress(pb, text):

    text = text.rstrip("\r\n")

    g = _GIT_PROGRESS_RE.match(text)

    if g is not None:

        (text, pct, current, total) = g.groups()

        pb.update(text, int(current), int(total))

    else:

        pb.update(text, 0, 0)

class InterRemoteGitNonGitRepository(InterGitNonGitRepository):

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

    repository."""

    def get_target_heads(self):

        # FIXME: This should be more efficient

        all_revs = self.target.all_revision_ids()

        parent_map = self.target.get_parent_map(all_revs)

        all_parents = set()

        map(all_parents.update, parent_map.itervalues())

        return set(all_revs) - all_parents

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

        def progress(text):

            report_git_progress(pb, text)

        store = BazaarObjectStore(self.target, mapping)

        self.target.lock_write()

        try:

            heads = self.get_target_heads()

            graph_walker = store.get_graph_walker(

                    [store._lookup_revision_sha1(head) for head in heads])

            recorded_wants = []

            def record_determine_wants(heads):

                wants = determine_wants(heads)

                recorded_wants.extend(wants)

                return wants

            create_pb = None

            if pb is None:

                create_pb = pb = ui.ui_factory.nested_progress_bar()

            try:

                objects_iter = self.source.fetch_objects(

                            record_determine_wants, graph_walker,

                            store.get_raw, progress)

                return import_git_objects(self.target, mapping,

                    objects_iter, store, recorded_wants, pb, limit)

            finally:

                if create_pb:

                    create_pb.finished()

        finally:

            self.target.unlock()

    @staticmethod

    def is_compatible(source, target):

        """Be compatible with GitRepository."""

        # FIXME: Also check target uses VersionedFile

        return (isinstance(source, RemoteGitRepository) and

                target.supports_rich_root() and

                not isinstance(target, GitRepository))

class InterLocalGitNonGitRepository(InterGitNonGitRepository):

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

    repository."""

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

        """Fetch objects.

        """

        wants = determine_wants(self.source._git.get_refs())

        create_pb = None

        if pb is None:

            create_pb = pb = ui.ui_factory.nested_progress_bar()

        target_git_object_retriever = BazaarObjectStore(self.target, mapping)

        try:

            self.target.lock_write()

            try:

                return import_git_objects(self.target, mapping,

                    self.source._git.object_store,

                    target_git_object_retriever, wants, pb, limit)

            finally:

                self.target.unlock()