config: read configs from directories in lexicographical order
Mercurial currently reads the .rc files specified in HGRCPATH (and the
system-default paths) in directory order, which is unspecified. My
team at work maintains a set of .rc files. So far there has been no
overlap between them, so we had not noticed this behavior. However, we
would now like to release some common .rc files and then have another
one per plaform with platform-specific overrides. It would be nice if
we can determine the load order by choosing names carefully. This
patch enables that by loading the .rc files in lexicographical order.
Before this patch, the added test case would consistently say "30" on
my file system (whatever I have -- some Linux FS).
Differential Revision: https://phab.mercurial-scm.org/D6193
# narrowspec.py - methods for working with a narrow view of a repository
#
# Copyright 2017 Google, Inc.
#
# 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 absolute_import
import errno
from .i18n import _
from . import (
error,
match as matchmod,
merge,
repository,
sparse,
util,
)
# The file in .hg/store/ that indicates which paths exit in the store
FILENAME = 'narrowspec'
# The file in .hg/ that indicates which paths exit in the dirstate
DIRSTATE_FILENAME = 'narrowspec.dirstate'
# Pattern prefixes that are allowed in narrow patterns. This list MUST
# only contain patterns that are fast and safe to evaluate. Keep in mind
# that patterns are supplied by clients and executed on remote servers
# as part of wire protocol commands. That means that changes to this
# data structure influence the wire protocol and should not be taken
# lightly - especially removals.
VALID_PREFIXES = (
b'path:',
b'rootfilesin:',
)
def normalizesplitpattern(kind, pat):
"""Returns the normalized version of a pattern and kind.
Returns a tuple with the normalized kind and normalized pattern.
"""
pat = pat.rstrip('/')
_validatepattern(pat)
return kind, pat
def _numlines(s):
"""Returns the number of lines in s, including ending empty lines."""
# We use splitlines because it is Unicode-friendly and thus Python 3
# compatible. However, it does not count empty lines at the end, so trick
# it by adding a character at the end.
return len((s + 'x').splitlines())
def _validatepattern(pat):
"""Validates the pattern and aborts if it is invalid.
Patterns are stored in the narrowspec as newline-separated
POSIX-style bytestring paths. There's no escaping.
"""
# We use newlines as separators in the narrowspec file, so don't allow them
# in patterns.
if _numlines(pat) > 1:
raise error.Abort(_('newlines are not allowed in narrowspec paths'))
components = pat.split('/')
if '.' in components or '..' in components:
raise error.Abort(_('"." and ".." are not allowed in narrowspec paths'))
def normalizepattern(pattern, defaultkind='path'):
"""Returns the normalized version of a text-format pattern.
If the pattern has no kind, the default will be added.
"""
kind, pat = matchmod._patsplit(pattern, defaultkind)
return '%s:%s' % normalizesplitpattern(kind, pat)
def parsepatterns(pats):
"""Parses an iterable of patterns into a typed pattern set.
Patterns are assumed to be ``path:`` if no prefix is present.
For safety and performance reasons, only some prefixes are allowed.
See ``validatepatterns()``.
This function should be used on patterns that come from the user to
normalize and validate them to the internal data structure used for
representing patterns.
"""
res = {normalizepattern(orig) for orig in pats}
validatepatterns(res)
return res
def validatepatterns(pats):
"""Validate that patterns are in the expected data structure and format.
And that is a set of normalized patterns beginning with ``path:`` or
``rootfilesin:``.
This function should be used to validate internal data structures
and patterns that are loaded from sources that use the internal,
prefixed pattern representation (but can't necessarily be fully trusted).
"""
if not isinstance(pats, set):
raise error.ProgrammingError('narrow patterns should be a set; '
'got %r' % pats)
for pat in pats:
if not pat.startswith(VALID_PREFIXES):
# Use a Mercurial exception because this can happen due to user
# bugs (e.g. manually updating spec file).
raise error.Abort(_('invalid prefix on narrow pattern: %s') % pat,
hint=_('narrow patterns must begin with one of '
'the following: %s') %
', '.join(VALID_PREFIXES))
def format(includes, excludes):
output = '[include]\n'
for i in sorted(includes - excludes):
output += i + '\n'
output += '[exclude]\n'
for e in sorted(excludes):
output += e + '\n'
return output
def match(root, include=None, exclude=None):
if not include:
# Passing empty include and empty exclude to matchmod.match()
# gives a matcher that matches everything, so explicitly use
# the nevermatcher.
return matchmod.never()
return matchmod.match(root, '', [], include=include or [],
exclude=exclude or [])
def parseconfig(ui, spec):
# maybe we should care about the profiles returned too
includepats, excludepats, profiles = sparse.parseconfig(ui, spec, 'narrow')
if profiles:
raise error.Abort(_("including other spec files using '%include' is not"
" supported in narrowspec"))
validatepatterns(includepats)
validatepatterns(excludepats)
return includepats, excludepats
def load(repo):
try:
spec = repo.svfs.read(FILENAME)
except IOError as e:
# Treat "narrowspec does not exist" the same as "narrowspec file exists
# and is empty".
if e.errno == errno.ENOENT:
return set(), set()
raise
return parseconfig(repo.ui, spec)
def save(repo, includepats, excludepats):
validatepatterns(includepats)
validatepatterns(excludepats)
spec = format(includepats, excludepats)
repo.svfs.write(FILENAME, spec)
def copytoworkingcopy(repo):
spec = repo.svfs.read(FILENAME)
repo.vfs.write(DIRSTATE_FILENAME, spec)
def savebackup(repo, backupname):
if repository.NARROW_REQUIREMENT not in repo.requirements:
return
svfs = repo.svfs
svfs.tryunlink(backupname)
util.copyfile(svfs.join(FILENAME), svfs.join(backupname), hardlink=True)
def restorebackup(repo, backupname):
if repository.NARROW_REQUIREMENT not in repo.requirements:
return
util.rename(repo.svfs.join(backupname), repo.svfs.join(FILENAME))
def savewcbackup(repo, backupname):
if repository.NARROW_REQUIREMENT not in repo.requirements:
return
vfs = repo.vfs
vfs.tryunlink(backupname)
# It may not exist in old repos
if vfs.exists(DIRSTATE_FILENAME):
util.copyfile(vfs.join(DIRSTATE_FILENAME), vfs.join(backupname),
hardlink=True)
def restorewcbackup(repo, backupname):
if repository.NARROW_REQUIREMENT not in repo.requirements:
return
# It may not exist in old repos
if repo.vfs.exists(backupname):
util.rename(repo.vfs.join(backupname), repo.vfs.join(DIRSTATE_FILENAME))
def clearwcbackup(repo, backupname):
if repository.NARROW_REQUIREMENT not in repo.requirements:
return
repo.vfs.tryunlink(backupname)
def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
r""" Restricts the patterns according to repo settings,
results in a logical AND operation
:param req_includes: requested includes
:param req_excludes: requested excludes
:param repo_includes: repo includes
:param repo_excludes: repo excludes
:return: include patterns, exclude patterns, and invalid include patterns.
>>> restrictpatterns({'f1','f2'}, {}, ['f1'], [])
(set(['f1']), {}, [])
>>> restrictpatterns({'f1'}, {}, ['f1','f2'], [])
(set(['f1']), {}, [])
>>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], [])
(set(['f1/fc1']), {}, [])
>>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], [])
([], set(['path:.']), [])
>>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], [])
(set(['f2/fc2']), {}, [])
>>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], [])
([], set(['path:.']), [])
>>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], [])
(set(['f1/$non_exitent_var']), {}, [])
"""
res_excludes = set(req_excludes)
res_excludes.update(repo_excludes)
invalid_includes = []
if not req_includes:
res_includes = set(repo_includes)
elif 'path:.' not in repo_includes:
res_includes = []
for req_include in req_includes:
req_include = util.expandpath(util.normpath(req_include))
if req_include in repo_includes:
res_includes.append(req_include)
continue
valid = False
for repo_include in repo_includes:
if req_include.startswith(repo_include + '/'):
valid = True
res_includes.append(req_include)
break
if not valid:
invalid_includes.append(req_include)
if len(res_includes) == 0:
res_excludes = {'path:.'}
else:
res_includes = set(res_includes)
else:
res_includes = set(req_includes)
return res_includes, res_excludes, invalid_includes
# These two are extracted for extensions (specifically for Google's CitC file
# system)
def _deletecleanfiles(repo, files):
for f in files:
repo.wvfs.unlinkpath(f)
def _writeaddedfiles(repo, pctx, files):
actions = merge.emptyactions()
addgaction = actions[merge.ACTION_GET].append
mf = repo['.'].manifest()
for f in files:
if not repo.wvfs.exists(f):
addgaction((f, (mf.flags(f), False), "narrowspec updated"))
merge.applyupdates(repo, actions, wctx=repo[None],
mctx=repo['.'], overwrite=False)
def checkworkingcopynarrowspec(repo):
storespec = repo.svfs.tryread(FILENAME)
wcspec = repo.vfs.tryread(DIRSTATE_FILENAME)
if wcspec != storespec:
raise error.Abort(_("working copy's narrowspec is stale"),
hint=_("run 'hg tracked --update-working-copy'"))
def updateworkingcopy(repo, assumeclean=False):
"""updates the working copy and dirstate from the store narrowspec
When assumeclean=True, files that are not known to be clean will also
be deleted. It is then up to the caller to make sure they are clean.
"""
oldspec = repo.vfs.tryread(DIRSTATE_FILENAME)
newspec = repo.svfs.tryread(FILENAME)
oldincludes, oldexcludes = parseconfig(repo.ui, oldspec)
newincludes, newexcludes = parseconfig(repo.ui, newspec)
oldmatch = match(repo.root, include=oldincludes, exclude=oldexcludes)
newmatch = match(repo.root, include=newincludes, exclude=newexcludes)
addedmatch = matchmod.differencematcher(newmatch, oldmatch)
removedmatch = matchmod.differencematcher(oldmatch, newmatch)
ds = repo.dirstate
lookup, status = ds.status(removedmatch, subrepos=[], ignored=False,
clean=True, unknown=False)
trackeddirty = status.modified + status.added
clean = status.clean
if assumeclean:
assert not trackeddirty
clean.extend(lookup)
else:
trackeddirty.extend(lookup)
_deletecleanfiles(repo, clean)
for f in sorted(trackeddirty):
repo.ui.status(_('not deleting possibly dirty file %s\n') % f)
for f in clean + trackeddirty:
ds.drop(f)
repo.narrowpats = newincludes, newexcludes
repo._narrowmatch = newmatch
pctx = repo['.']
newfiles = [f for f in pctx.manifest().walk(addedmatch) if f not in ds]
for f in newfiles:
ds.normallookup(f)
_writeaddedfiles(repo, pctx, newfiles)