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Viewing changes to breezy/git/filegraph.py

  • Committer: Jelmer Vernooij
  • Date: 2020-04-05 19:11:34 UTC
  • mto: (7490.7.16 work)
  • mto: This revision was merged to the branch mainline in revision 7501.
  • Revision ID: jelmer@jelmer.uk-20200405191134-0aebh8ikiwygxma5
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breezy/git/filegraph.py
 
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# Copyright (C) 2011 Canonical Ltd
 
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# Copyright (C) 2012-2018 Jelmer Vernooij <jelmer@jelmer.uk>
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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"""File graph access."""
 
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from __future__ import absolute_import
 
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import stat
 
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from dulwich.errors import (
 
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    NotTreeError,
 
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    )
 
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from dulwich.object_store import (
 
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    tree_lookup_path,
 
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    )
 
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from ..revision import (
 
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    NULL_REVISION,
 
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    )
 
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class GitFileLastChangeScanner(object):
 
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    def __init__(self, repository):
 
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        self.repository = repository
 
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        self.store = self.repository._git.object_store
 
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    def find_last_change_revision(self, path, commit_id):
 
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        if not isinstance(path, bytes):
 
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            raise TypeError(path)
 
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        commit = self.store[commit_id]
 
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        target_mode, target_sha = tree_lookup_path(self.store.__getitem__,
 
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                                                   commit.tree, path)
 
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        if path == b'':
 
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            target_mode = stat.S_IFDIR
 
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        if target_mode is None:
 
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            raise AssertionError("sha %r for %r in %r" %
 
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                                 (target_sha, path, commit_id))
 
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        while True:
 
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            parent_commits = []
 
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            for parent_commit in [self.store[c] for c in commit.parents]:
 
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                try:
 
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                    mode, sha = tree_lookup_path(self.store.__getitem__,
 
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                                                 parent_commit.tree, path)
 
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                except (NotTreeError, KeyError):
 
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                    continue
 
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                else:
 
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                    parent_commits.append(parent_commit)
 
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                if path == b'':
 
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                    mode = stat.S_IFDIR
 
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                # Candidate found iff, mode or text changed,
 
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                # or is a directory that didn't previously exist.
 
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                if mode != target_mode or (
 
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                        not stat.S_ISDIR(target_mode) and sha != target_sha):
 
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                    return (path, commit.id)
 
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            if parent_commits == []:
 
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                break
 
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            commit = parent_commits[0]
 
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        return (path, commit.id)
 
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class GitFileParentProvider(object):
 
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    def __init__(self, change_scanner):
 
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        self.change_scanner = change_scanner
 
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        self.store = self.change_scanner.repository._git.object_store
 
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    def _get_parents(self, file_id, text_revision):
 
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        commit_id, mapping = (
 
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            self.change_scanner.repository.lookup_bzr_revision_id(
 
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                text_revision))
 
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        try:
 
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            path = mapping.parse_file_id(file_id).encode('utf-8')
 
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        except ValueError:
 
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            raise KeyError(file_id)
 
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        text_parents = []
 
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        for commit_parent in self.store[commit_id].parents:
 
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            try:
 
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                (path, text_parent) = (
 
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                    self.change_scanner.find_last_change_revision(
 
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                        path, commit_parent))
 
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            except KeyError:
 
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                continue
 
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            if text_parent not in text_parents:
 
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                text_parents.append(text_parent)
 
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        return tuple([
 
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            (file_id,
 
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                self.change_scanner.repository.lookup_foreign_revision_id(p))
 
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            for p in text_parents])
 
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    def get_parent_map(self, keys):
 
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        ret = {}
 
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        for key in keys:
 
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            (file_id, text_revision) = key
 
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            if text_revision == NULL_REVISION:
 
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                ret[key] = ()
 
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                continue
 
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            if not isinstance(file_id, bytes):
 
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                raise TypeError(file_id)
 
114
            if not isinstance(text_revision, bytes):
 
115
                raise TypeError(text_revision)
 
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            try:
 
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                ret[key] = self._get_parents(file_id, text_revision)
 
118
            except KeyError:
 
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                pass
 
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        return ret