/brz/remove-bazaar

# Copyright (C) 2011 Canonical Ltd

# Copyright (C) 2012-2018 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

"""File graph access."""

from __future__ import absolute_import

import stat

from dulwich.errors import (

    NotTreeError,

    )

from dulwich.object_store import (

    tree_lookup_path,

    )

from ..revision import (

    NULL_REVISION,

    )

class GitFileLastChangeScanner(object):

    def __init__(self, repository):

        self.repository = repository

        self.store = self.repository._git.object_store

    def find_last_change_revision(self, path, commit_id):

        if not isinstance(path, bytes):

            raise TypeError(path)

        commit = self.store[commit_id]

        target_mode, target_sha = tree_lookup_path(self.store.__getitem__,

                                                   commit.tree, path)

        if path == b'':

            target_mode = stat.S_IFDIR

        if target_mode is None:

            raise AssertionError("sha %r for %r in %r" %

                                 (target_sha, path, commit_id))

        while True:

            parent_commits = []

            for parent_commit in [self.store[c] for c in commit.parents]:

                try:

                    mode, sha = tree_lookup_path(self.store.__getitem__,

                                                 parent_commit.tree, path)

                except (NotTreeError, KeyError):

                    continue

                else:

                    parent_commits.append(parent_commit)

                if path == b'':

                    mode = stat.S_IFDIR

                # Candidate found iff, mode or text changed,

                # or is a directory that didn't previously exist.

                if mode != target_mode or (

                        not stat.S_ISDIR(target_mode) and sha != target_sha):

                    return (path, commit.id)

            if parent_commits == []:

                break

            commit = parent_commits[0]

        return (path, commit.id)

class GitFileParentProvider(object):

    def __init__(self, change_scanner):

        self.change_scanner = change_scanner

        self.store = self.change_scanner.repository._git.object_store

    def _get_parents(self, file_id, text_revision):

        commit_id, mapping = (

            self.change_scanner.repository.lookup_bzr_revision_id(

                text_revision))

        try:

            path = mapping.parse_file_id(file_id)

        except ValueError:

            raise KeyError(file_id)

        text_parents = []

        for commit_parent in self.store[commit_id].parents:

            try:

                (path, text_parent) = (

                    self.change_scanner.find_last_change_revision(

                        path.encode('utf-8'), commit_parent))

            except KeyError:

                continue

            if text_parent not in text_parents:

                text_parents.append(text_parent)

        return tuple([

            (file_id,

                self.change_scanner.repository.lookup_foreign_revision_id(p))

            for p in text_parents])

    def get_parent_map(self, keys):

        ret = {}

        for key in keys:

            (file_id, text_revision) = key

            if text_revision == NULL_REVISION:

                ret[key] = ()

                continue

            if not isinstance(file_id, bytes):

                raise TypeError(file_id)

            if not isinstance(text_revision, bytes):

                raise TypeError(text_revision)

            try:

                ret[key] = self._get_parents(file_id, text_revision)

            except KeyError:

                pass

        return ret