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Viewing changes to breezy/git/filegraph.py

  • Committer: Robert Collins
  • Date: 2010-05-06 11:08:10 UTC
  • mto: This revision was merged to the branch mainline in revision 5223.
  • Revision ID: robertc@robertcollins.net-20100506110810-h3j07fh5gmw54s25
Cleaner matcher matching revised unlocking protocol.

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breezy/git/filegraph.py
1
 
# 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" % (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 = 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)
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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) = self.change_scanner.find_last_change_revision(path.encode('utf-8'), 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([(file_id,
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            self.change_scanner.repository.lookup_foreign_revision_id(p)) for p
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            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
104
 
            if text_revision == NULL_REVISION:
105
 
                ret[key] = ()
106
 
                continue
107
 
            if not isinstance(file_id, bytes):
108
 
                raise TypeError(file_id)
109
 
            if not isinstance(text_revision, bytes):
110
 
                raise TypeError(text_revision)
111
 
            try:
112
 
                ret[key] = self._get_parents(file_id, text_revision)
113
 
            except KeyError:
114
 
                pass
115
 
        return ret