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revlogutils: remember known metadata parents for issue6528...
revlogutils: remember known metadata parents for issue6528 In the cases where the parent revs tell us for sure that the parent has metadata, remember this fact to avoid content recomputations later.

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repoviewutil.py
53 lines | 1.6 KiB | text/x-python | PythonLexer
# repoviewutil.py - constaints data relevant to repoview.py and other module
#
# Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Logilab SA <contact@logilab.fr>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import annotations
from .. import error
### Nearest subset relation
# Nearest subset of filter X is a filter Y so that:
# * Y is included in X,
# * X - Y is as small as possible.
# This create and ordering used for branchmap purpose.
# the ordering may be partial
subsettable = {
None: b'visible',
b'visible-hidden': b'visible',
b'visible': b'served',
b'served.hidden': b'served',
b'served': b'immutable',
b'immutable': b'base',
}
def get_ordered_subset():
"""return a list of subset name from dependencies to dependents"""
_unfinalized = set(subsettable.values())
ordered = []
# the subset table is expected to be small so we do the stupid N² version
# of the algorithm
while _unfinalized:
this_level = []
for candidate in _unfinalized:
dependency = subsettable.get(candidate)
if dependency not in _unfinalized:
this_level.append(candidate)
if not this_level:
msg = "cyclic dependencies in repoview subset %r"
msg %= subsettable
raise error.ProgrammingError(msg)
this_level.sort(key=lambda x: x if x is not None else '')
ordered.extend(this_level)
_unfinalized.difference_update(this_level)
return ordered