Mercurial > hg
view mercurial/rcutil.py @ 49232:4c57ce494a4e
worker: stop relying on garbage collection to release memoryview
On CPython, before resizing the bytearray, all memoryviews referencing it must
be released. Before this change, we ensured that all references to them were
deleted. On CPython, this was enough to set the reference count to zero, which
results in garbage collecting and releasing them.
On PyPy, releasing the memoryviews is not necessary because they are implemented
differently. If it would be necessary however, ensuring that all references are
deleted would not be suffient because PyPy doesn’t use reference counting.
By using with statements that take care of releasing the memoryviews, we ensure
that the bytearray is resizable without relying on implementation details. So
while this doesn’t fix any observable bug, it increases compatiblity with other
and future Python implementations.
author | Manuel Jacob <me@manueljacob.de> |
---|---|
date | Sat, 21 May 2022 23:31:30 +0200 |
parents | 6000f5b25c9b |
children |
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# rcutil.py - utilities about config paths, special config sections etc. # # Copyright Mercurial Contributors # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import os from . import ( encoding, pycompat, util, ) from .utils import resourceutil if pycompat.iswindows: from . import scmwindows as scmplatform else: from . import scmposix as scmplatform fallbackpager = scmplatform.fallbackpager systemrcpath = scmplatform.systemrcpath userrcpath = scmplatform.userrcpath def _expandrcpath(path): '''path could be a file or a directory. return a list of file paths''' p = util.expandpath(path) if os.path.isdir(p): join = os.path.join return sorted( join(p, f) for f, k in util.listdir(p) if f.endswith(b'.rc') ) return [p] def envrcitems(env=None): """Return [(section, name, value, source)] config items. The config items are extracted from environment variables specified by env, used to override systemrc, but not userrc. If env is not provided, encoding.environ will be used. """ if env is None: env = encoding.environ checklist = [ (b'EDITOR', b'ui', b'editor'), (b'VISUAL', b'ui', b'editor'), (b'PAGER', b'pager', b'pager'), ] result = [] for envname, section, configname in checklist: if envname not in env: continue result.append((section, configname, env[envname], b'$%s' % envname)) return result def default_rc_resources(): """return rc resource IDs in defaultrc""" rsrcs = resourceutil.contents(b'mercurial.defaultrc') return [ (b'mercurial.defaultrc', r) for r in sorted(rsrcs) if resourceutil.is_resource(b'mercurial.defaultrc', r) and r.endswith(b'.rc') ] def rccomponents(): """return an ordered [(type, obj)] about where to load configs. respect $HGRCPATH. if $HGRCPATH is empty, only .hg/hgrc of current repo is used. if $HGRCPATH is not set, the platform default will be used. if a directory is provided, *.rc files under it will be used. type could be either 'path', 'items' or 'resource'. If type is 'path', obj is a string, and is the config file path. if type is 'items', obj is a list of (section, name, value, source) that should fill the config directly. If type is 'resource', obj is a tuple of (package name, resource name). """ envrc = (b'items', envrcitems()) if b'HGRCPATH' in encoding.environ: # assume HGRCPATH is all about user configs so environments can be # overridden. _rccomponents = [envrc] for p in encoding.environ[b'HGRCPATH'].split(pycompat.ospathsep): if not p: continue _rccomponents.extend((b'path', p) for p in _expandrcpath(p)) else: _rccomponents = [(b'resource', r) for r in default_rc_resources()] normpaths = lambda paths: [ (b'path', os.path.normpath(p)) for p in paths ] _rccomponents.extend(normpaths(systemrcpath())) _rccomponents.append(envrc) _rccomponents.extend(normpaths(userrcpath())) return _rccomponents def defaultpagerenv(): """return a dict of default environment variables and their values, intended to be set before starting a pager. """ return {b'LESS': b'FRX', b'LV': b'-c'} def use_repo_hgrc(): """True if repositories `.hg/hgrc` config should be read""" return b'HGRCSKIPREPO' not in encoding.environ