/brz/remove-bazaar

# Copyright (C) 2008-2018 Jelmer Vernooij <jelmer@jelmer.uk>

#

# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Fetching from git into bzr."""

from __future__ import absolute_import

from dulwich.objects import (

    Commit,

    Tag,

    Tree,

    S_IFGITLINK,

    S_ISGITLINK,

    ZERO_SHA,

    )

from dulwich.object_store import (

    tree_lookup_path,

    )

import posixpath

import stat

from .. import (

    debug,

    errors,

    osutils,

    trace,

    )

from ..errors import (

    BzrError,

    )

from ..bzr.inventory import (

    InventoryDirectory,

    InventoryFile,

    InventoryLink,

    TreeReference,

    )

from ..revision import (

    NULL_REVISION,

    )

from ..bzr.inventorytree import InventoryRevisionTree

from ..sixish import text_type

from ..bzr.testament import (

    StrictTestament3,

    )

from ..tsort import (

    topo_sort,

    )

from ..bzr.versionedfile import (

    ChunkedContentFactory,

    )

from .mapping import (

    DEFAULT_FILE_MODE,

    mode_is_executable,

    mode_kind,

    warn_unusual_mode,

    )

from .object_store import (

    LRUTreeCache,

    _tree_to_objects,

    )

def import_git_blob(texts, mapping, path, name, hexshas,

                    base_bzr_tree, parent_id, revision_id,

                    parent_bzr_trees, lookup_object, modes, 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 not isinstance(path, bytes):

        raise TypeError(path)

    decoded_path = path.decode('utf-8')

    (base_mode, mode) = modes

    (base_hexsha, hexsha) = hexshas

    if mapping.is_special_file(path):

        return []

    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(decoded_path)

    if stat.S_ISLNK(mode):

        cls = InventoryLink

    else:

        cls = InventoryFile

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

    if ie.kind == "file":

        ie.executable = mode_is_executable(mode)

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

        base_exec = base_bzr_tree.is_executable(decoded_path)

        if ie.kind == "symlink":

            ie.symlink_target = base_bzr_tree.get_symlink_target(decoded_path)

        else:

            ie.text_size = base_bzr_tree.get_file_size(decoded_path)

            ie.text_sha1 = base_bzr_tree.get_file_sha1(decoded_path)

        if ie.kind == "symlink" or ie.executable == base_exec:

            ie.revision = base_bzr_tree.get_file_revision(decoded_path)

        else:

            blob = lookup_object(hexsha)

    else:

        blob = lookup_object(hexsha)

        if ie.kind == "symlink":

            ie.revision = None

            ie.symlink_target = blob.data.decode("utf-8")

        else:

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

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

    # Check what revision we should store

    parent_keys = []

    for ptree in parent_bzr_trees:

        try:

            ppath = ptree.id2path(file_id)

        except errors.NoSuchId:

            continue

        pkind = ptree.kind(ppath)

        if (pkind == ie.kind and

            ((pkind == "symlink" and ptree.get_symlink_target(ppath) == ie.symlink_target) or

             (pkind == "file" and ptree.get_file_sha1(ppath) == ie.text_sha1 and

                ptree.is_executable(ppath) == ie.executable))):

            # found a revision in one of the parents to use

            ie.revision = ptree.get_file_revision(ppath)

            break

        parent_key = (file_id, ptree.get_file_revision(ppath))

        if parent_key not in parent_keys:

            parent_keys.append(parent_key)

    if ie.revision is None:

        # Need to store a new revision

        ie.revision = revision_id

        if ie.revision is None:

            raise ValueError("no file revision set")

        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 = decoded_path  # Renames are not supported yet

        if stat.S_ISDIR(base_mode):

            invdelta.extend(remove_disappeared_children(

                base_bzr_tree, old_path, lookup_object(base_hexsha), [],

                lookup_object))

    else:

        old_path = None

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

    if base_hexsha != hexsha:

        store_updater.add_object(blob, (ie.file_id, ie.revision), path)

    return invdelta

class SubmodulesRequireSubtrees(BzrError):

    _fmt = ("The repository you are fetching from contains submodules, "

            "which require a Bazaar format that supports tree references.")

    internal = False

def import_git_submodule(texts, mapping, path, name, hexshas,

                         base_bzr_tree, parent_id, revision_id,

                         parent_bzr_trees, lookup_object,

                         modes, store_updater, lookup_file_id):

    """Import a git submodule."""

    (base_hexsha, hexsha) = hexshas

    (base_mode, mode) = modes

    if base_hexsha == hexsha and base_mode == mode:

        return [], {}

    file_id = lookup_file_id(path)

    invdelta = []

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

    ie.revision = revision_id

    if base_hexsha is not None:

        old_path = path.decode("utf-8")  # Renames are not supported yet

        if stat.S_ISDIR(base_mode):

            invdelta.extend(remove_disappeared_children(

                base_bzr_tree, old_path, lookup_object(base_hexsha), [],

                lookup_object))

    else:

        old_path = None

    ie.reference_revision = mapping.revision_id_foreign_to_bzr(hexsha)

    texts.insert_record_stream([

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

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

    return invdelta, {}

def remove_disappeared_children(base_bzr_tree, path, base_tree,

                                existing_children, lookup_object):

    """Generate an inventory delta for removed children.

    :param base_bzr_tree: Base bzr tree against which to generate the

        inventory delta.

    :param path: Path to process (unicode)

    :param base_tree: Git Tree base object

    :param existing_children: Children that still exist

    :param lookup_object: Lookup a git object by its SHA1

    :return: Inventory delta, as list

    """

    if not isinstance(path, text_type):

        raise TypeError(path)

    ret = []

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

        if name in existing_children:

            continue

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

        file_id = base_bzr_tree.path2id(c_path)

        if file_id is None:

            raise TypeError(file_id)

        ret.append((c_path, None, file_id, None))

        if stat.S_ISDIR(mode):

            ret.extend(remove_disappeared_children(

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

                lookup_object))

    return ret

def import_git_tree(texts, mapping, path, name, hexshas,

                    base_bzr_tree, parent_id, revision_id, parent_bzr_trees,

                    lookup_object, modes, 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 (str)

    :param name: Name of the tree (str)

    :param tree: A git tree object

    :param base_bzr_tree: Base inventory against which to return inventory

        delta

    :return: Inventory delta for this subtree

    """

    (base_hexsha, hexsha) = hexshas

    (base_mode, mode) = modes

    if not isinstance(path, bytes):

        raise TypeError(path)

    if not isinstance(name, bytes):

        raise TypeError(name)

    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(osutils.safe_unicode(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.decode("utf-8")  # Renames aren't supported yet

    new_path = path.decode("utf-8")

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

        ie.revision = revision_id

        invdelta.append((old_path, new_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 name, child_mode, child_hexsha in tree.iteritems():

        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_bzr_tree, file_id,

                revision_id, parent_bzr_trees, 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_bzr_tree, file_id, revision_id, parent_bzr_trees,

                lookup_object, (child_base_mode, child_mode), store_updater,

                lookup_file_id)

        else:

            if not mapping.is_special_file(name):

                subinvdelta = import_git_blob(

                    texts, mapping, child_path, name,

                    (child_base_hexsha, child_hexsha), base_bzr_tree, file_id,

                    revision_id, parent_bzr_trees, lookup_object,

                    (child_base_mode, child_mode), store_updater,

                    lookup_file_id)

            else:

                subinvdelta = []

            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 | 0o111,

                              S_IFGITLINK):

            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_bzr_tree, old_path, base_tree, existing_children,

            lookup_object))

    store_updater.add_object(tree, (file_id, revision_id), path)

    return invdelta, child_modes

def verify_commit_reconstruction(target_git_object_retriever, lookup_object,

                                 o, rev, ret_tree, parent_trees, mapping,

                                 unusual_modes, verifiers):

    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, True,

                                                            verifiers)

    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, mapping.BZR_DUMMY_FILE):

        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 ensure_inventories_in_repo(repo, trees):

    real_inv_vf = repo.inventories.without_fallbacks()

    for t in trees:

        revid = t.get_revision_id()

        if not real_inv_vf.get_parent_map([(revid, )]):

            repo.add_inventory(revid, t.root_inventory, t.get_parent_ids())

def import_git_commit(repo, mapping, head, lookup_object,

                      target_git_object_retriever, trees_cache):

    o = lookup_object(head)

    # Note that this uses mapping.revision_id_foreign_to_bzr. If the parents

    # were bzr roundtripped revisions they would be specified in the

    # roundtrip data.

    rev, roundtrip_revid, verifiers = mapping.import_commit(

        o, mapping.revision_id_foreign_to_bzr)

    if roundtrip_revid is not None:

        original_revid = rev.revision_id

        rev.revision_id = roundtrip_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.

    parent_trees = trees_cache.revision_trees(rev.parent_ids)

    ensure_inventories_in_repo(repo, parent_trees)

    if parent_trees == []:

        base_bzr_tree = trees_cache.revision_tree(NULL_REVISION)

        base_tree = None

        base_mode = None

    else:

        base_bzr_tree = parent_trees[0]

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

        base_mode = stat.S_IFDIR

    store_updater = target_git_object_retriever._get_updater(rev)

    tree_supplement = mapping.get_fileid_map(lookup_object, o.tree)

    inv_delta, unusual_modes = import_git_tree(

        repo.texts, mapping, b"", b"", (base_tree, o.tree), base_bzr_tree,

        None, rev.revision_id, parent_trees, lookup_object,

        (base_mode, stat.S_IFDIR), store_updater,

        tree_supplement.lookup_file_id,

        allow_submodules=repo._format.supports_tree_reference)

    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_bzr_inventory = None

    else:

        base_bzr_inventory = base_bzr_tree.root_inventory

    rev.inventory_sha1, inv = repo.add_inventory_by_delta(

        basis_id, inv_delta, rev.revision_id, rev.parent_ids,

        base_bzr_inventory)

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

    # Check verifiers

    if verifiers and roundtrip_revid is not None:

        testament = StrictTestament3(rev, ret_tree)

        calculated_verifiers = {"testament3-sha1": testament.as_sha1()}

        if calculated_verifiers != verifiers:

            trace.mutter("Testament SHA1 %r for %r did not match %r.",

                         calculated_verifiers["testament3-sha1"],

                         rev.revision_id, verifiers["testament3-sha1"])

            rev.revision_id = original_revid

            rev.inventory_sha1, inv = repo.add_inventory_by_delta(

                basis_id, inv_delta, rev.revision_id, rev.parent_ids,

                base_bzr_tree)

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

    else:

        calculated_verifiers = {}

    store_updater.add_object(o, calculated_verifiers, None)

    store_updater.finish()

    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, verifiers)

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()

        if head == ZERO_SHA:

            continue

        if not isinstance(head, bytes):

            raise TypeError(head)

        try:

            o = lookup_object(head)

        except KeyError:

            continue

        if isinstance(o, Commit):

            rev, roundtrip_revid, verifiers = mapping.import_commit(

                o, mapping.revision_id_foreign_to_bzr)

            if (repo.has_revision(rev.revision_id)

                    or (roundtrip_revid and

                        repo.has_revision(roundtrip_revid))):

                continue

            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 BaseException:

                repo.abort_write_group()

                raise

            else:

                hint = repo.commit_write_group()

                if hint is not None:

                    pack_hints.extend(hint)

        except BaseException:

            target_git_object_retriever.abort_write_group()

            raise

        else:

            target_git_object_retriever.commit_write_group()

    return pack_hints, last_imported

class DetermineWantsRecorder(object):

    def __init__(self, actual):

        self.actual = actual

        self.wants = []

        self.remote_refs = {}

    def __call__(self, refs):

        if type(refs) is not dict:

            raise TypeError(refs)

        self.remote_refs = refs

        self.wants = self.actual(refs)

        return self.wants