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f546f0cc70
Other implementations of dirstate will want to replace the class used for the dirstate map. Allow this to happen by making the class an attribute of the dirstate. Differential Revision: https://phab.mercurial-scm.org/D1347
1496 lines
53 KiB
Python
1496 lines
53 KiB
Python
# dirstate.py - working directory tracking for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import collections
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import contextlib
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import errno
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import os
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import stat
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from .i18n import _
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from .node import nullid
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from . import (
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encoding,
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error,
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match as matchmod,
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pathutil,
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policy,
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pycompat,
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scmutil,
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txnutil,
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util,
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)
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parsers = policy.importmod(r'parsers')
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propertycache = util.propertycache
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filecache = scmutil.filecache
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_rangemask = 0x7fffffff
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dirstatetuple = parsers.dirstatetuple
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class repocache(filecache):
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"""filecache for files in .hg/"""
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def join(self, obj, fname):
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return obj._opener.join(fname)
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class rootcache(filecache):
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"""filecache for files in the repository root"""
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def join(self, obj, fname):
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return obj._join(fname)
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def _getfsnow(vfs):
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'''Get "now" timestamp on filesystem'''
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tmpfd, tmpname = vfs.mkstemp()
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try:
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return os.fstat(tmpfd).st_mtime
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finally:
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os.close(tmpfd)
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vfs.unlink(tmpname)
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class dirstate(object):
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def __init__(self, opener, ui, root, validate, sparsematchfn):
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'''Create a new dirstate object.
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opener is an open()-like callable that can be used to open the
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dirstate file; root is the root of the directory tracked by
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the dirstate.
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'''
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self._opener = opener
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self._validate = validate
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self._root = root
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self._sparsematchfn = sparsematchfn
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# ntpath.join(root, '') of Python 2.7.9 does not add sep if root is
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# UNC path pointing to root share (issue4557)
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self._rootdir = pathutil.normasprefix(root)
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self._dirty = False
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self._lastnormaltime = 0
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self._ui = ui
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self._filecache = {}
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self._parentwriters = 0
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self._filename = 'dirstate'
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self._pendingfilename = '%s.pending' % self._filename
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self._plchangecallbacks = {}
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self._origpl = None
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self._updatedfiles = set()
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self._mapcls = dirstatemap
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@contextlib.contextmanager
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def parentchange(self):
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'''Context manager for handling dirstate parents.
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If an exception occurs in the scope of the context manager,
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the incoherent dirstate won't be written when wlock is
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released.
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'''
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self._parentwriters += 1
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yield
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# Typically we want the "undo" step of a context manager in a
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# finally block so it happens even when an exception
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# occurs. In this case, however, we only want to decrement
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# parentwriters if the code in the with statement exits
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# normally, so we don't have a try/finally here on purpose.
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self._parentwriters -= 1
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def beginparentchange(self):
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'''Marks the beginning of a set of changes that involve changing
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the dirstate parents. If there is an exception during this time,
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the dirstate will not be written when the wlock is released. This
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prevents writing an incoherent dirstate where the parent doesn't
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match the contents.
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'''
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self._ui.deprecwarn('beginparentchange is obsoleted by the '
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'parentchange context manager.', '4.3')
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self._parentwriters += 1
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def endparentchange(self):
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'''Marks the end of a set of changes that involve changing the
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dirstate parents. Once all parent changes have been marked done,
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the wlock will be free to write the dirstate on release.
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'''
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self._ui.deprecwarn('endparentchange is obsoleted by the '
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'parentchange context manager.', '4.3')
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if self._parentwriters > 0:
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self._parentwriters -= 1
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def pendingparentchange(self):
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'''Returns true if the dirstate is in the middle of a set of changes
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that modify the dirstate parent.
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'''
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return self._parentwriters > 0
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@propertycache
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def _map(self):
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"""Return the dirstate contents (see documentation for dirstatemap)."""
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self._map = self._mapcls(self._ui, self._opener, self._root)
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return self._map
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@property
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def _sparsematcher(self):
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"""The matcher for the sparse checkout.
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The working directory may not include every file from a manifest. The
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matcher obtained by this property will match a path if it is to be
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included in the working directory.
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"""
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# TODO there is potential to cache this property. For now, the matcher
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# is resolved on every access. (But the called function does use a
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# cache to keep the lookup fast.)
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return self._sparsematchfn()
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@repocache('branch')
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def _branch(self):
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try:
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return self._opener.read("branch").strip() or "default"
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except IOError as inst:
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if inst.errno != errno.ENOENT:
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raise
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return "default"
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@property
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def _pl(self):
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return self._map.parents()
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def hasdir(self, d):
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return self._map.hastrackeddir(d)
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@rootcache('.hgignore')
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def _ignore(self):
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files = self._ignorefiles()
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if not files:
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return matchmod.never(self._root, '')
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pats = ['include:%s' % f for f in files]
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return matchmod.match(self._root, '', [], pats, warn=self._ui.warn)
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@propertycache
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def _slash(self):
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return self._ui.configbool('ui', 'slash') and pycompat.ossep != '/'
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@propertycache
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def _checklink(self):
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return util.checklink(self._root)
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@propertycache
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def _checkexec(self):
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return util.checkexec(self._root)
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@propertycache
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def _checkcase(self):
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return not util.fscasesensitive(self._join('.hg'))
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def _join(self, f):
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# much faster than os.path.join()
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# it's safe because f is always a relative path
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return self._rootdir + f
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def flagfunc(self, buildfallback):
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if self._checklink and self._checkexec:
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def f(x):
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try:
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st = os.lstat(self._join(x))
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if util.statislink(st):
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return 'l'
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if util.statisexec(st):
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return 'x'
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except OSError:
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pass
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return ''
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return f
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fallback = buildfallback()
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if self._checklink:
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def f(x):
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if os.path.islink(self._join(x)):
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return 'l'
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if 'x' in fallback(x):
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return 'x'
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return ''
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return f
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if self._checkexec:
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def f(x):
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if 'l' in fallback(x):
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return 'l'
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if util.isexec(self._join(x)):
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return 'x'
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return ''
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return f
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else:
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return fallback
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@propertycache
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def _cwd(self):
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# internal config: ui.forcecwd
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forcecwd = self._ui.config('ui', 'forcecwd')
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if forcecwd:
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return forcecwd
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return pycompat.getcwd()
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def getcwd(self):
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'''Return the path from which a canonical path is calculated.
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This path should be used to resolve file patterns or to convert
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canonical paths back to file paths for display. It shouldn't be
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used to get real file paths. Use vfs functions instead.
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'''
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cwd = self._cwd
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if cwd == self._root:
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return ''
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# self._root ends with a path separator if self._root is '/' or 'C:\'
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rootsep = self._root
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if not util.endswithsep(rootsep):
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rootsep += pycompat.ossep
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if cwd.startswith(rootsep):
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return cwd[len(rootsep):]
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else:
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# we're outside the repo. return an absolute path.
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return cwd
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def pathto(self, f, cwd=None):
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if cwd is None:
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cwd = self.getcwd()
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path = util.pathto(self._root, cwd, f)
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if self._slash:
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return util.pconvert(path)
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return path
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def __getitem__(self, key):
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'''Return the current state of key (a filename) in the dirstate.
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States are:
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n normal
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m needs merging
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r marked for removal
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a marked for addition
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? not tracked
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'''
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return self._map.get(key, ("?",))[0]
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def __contains__(self, key):
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return key in self._map
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def __iter__(self):
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return iter(sorted(self._map))
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def items(self):
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return self._map.iteritems()
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iteritems = items
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def parents(self):
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return [self._validate(p) for p in self._pl]
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def p1(self):
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return self._validate(self._pl[0])
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def p2(self):
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return self._validate(self._pl[1])
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def branch(self):
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return encoding.tolocal(self._branch)
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def setparents(self, p1, p2=nullid):
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"""Set dirstate parents to p1 and p2.
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When moving from two parents to one, 'm' merged entries a
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adjusted to normal and previous copy records discarded and
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returned by the call.
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See localrepo.setparents()
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"""
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if self._parentwriters == 0:
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raise ValueError("cannot set dirstate parent without "
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"calling dirstate.beginparentchange")
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self._dirty = True
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oldp2 = self._pl[1]
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if self._origpl is None:
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self._origpl = self._pl
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self._map.setparents(p1, p2)
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copies = {}
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if oldp2 != nullid and p2 == nullid:
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candidatefiles = self._map.nonnormalset.union(
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self._map.otherparentset)
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for f in candidatefiles:
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s = self._map.get(f)
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if s is None:
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continue
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# Discard 'm' markers when moving away from a merge state
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if s[0] == 'm':
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source = self._map.copymap.get(f)
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if source:
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copies[f] = source
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self.normallookup(f)
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# Also fix up otherparent markers
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elif s[0] == 'n' and s[2] == -2:
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source = self._map.copymap.get(f)
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if source:
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copies[f] = source
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self.add(f)
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return copies
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def setbranch(self, branch):
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self._branch = encoding.fromlocal(branch)
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f = self._opener('branch', 'w', atomictemp=True, checkambig=True)
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try:
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f.write(self._branch + '\n')
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f.close()
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# make sure filecache has the correct stat info for _branch after
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# replacing the underlying file
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ce = self._filecache['_branch']
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if ce:
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ce.refresh()
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except: # re-raises
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f.discard()
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raise
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def invalidate(self):
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'''Causes the next access to reread the dirstate.
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This is different from localrepo.invalidatedirstate() because it always
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rereads the dirstate. Use localrepo.invalidatedirstate() if you want to
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check whether the dirstate has changed before rereading it.'''
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for a in ("_map", "_branch", "_ignore"):
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if a in self.__dict__:
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delattr(self, a)
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self._lastnormaltime = 0
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self._dirty = False
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self._updatedfiles.clear()
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self._parentwriters = 0
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self._origpl = None
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def copy(self, source, dest):
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"""Mark dest as a copy of source. Unmark dest if source is None."""
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if source == dest:
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return
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self._dirty = True
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if source is not None:
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self._map.copymap[dest] = source
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self._updatedfiles.add(source)
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self._updatedfiles.add(dest)
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elif self._map.copymap.pop(dest, None):
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self._updatedfiles.add(dest)
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def copied(self, file):
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return self._map.copymap.get(file, None)
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def copies(self):
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return self._map.copymap
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def _addpath(self, f, state, mode, size, mtime):
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oldstate = self[f]
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if state == 'a' or oldstate == 'r':
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scmutil.checkfilename(f)
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if self._map.hastrackeddir(f):
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raise error.Abort(_('directory %r already in dirstate') % f)
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# shadows
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for d in util.finddirs(f):
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if self._map.hastrackeddir(d):
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break
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entry = self._map.get(d)
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if entry is not None and entry[0] != 'r':
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raise error.Abort(
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_('file %r in dirstate clashes with %r') % (d, f))
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self._dirty = True
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self._updatedfiles.add(f)
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self._map.addfile(f, oldstate, state, mode, size, mtime)
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def normal(self, f):
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'''Mark a file normal and clean.'''
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s = os.lstat(self._join(f))
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mtime = s.st_mtime
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self._addpath(f, 'n', s.st_mode,
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s.st_size & _rangemask, mtime & _rangemask)
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self._map.copymap.pop(f, None)
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if f in self._map.nonnormalset:
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self._map.nonnormalset.remove(f)
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if mtime > self._lastnormaltime:
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# Remember the most recent modification timeslot for status(),
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# to make sure we won't miss future size-preserving file content
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# modifications that happen within the same timeslot.
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self._lastnormaltime = mtime
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def normallookup(self, f):
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'''Mark a file normal, but possibly dirty.'''
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if self._pl[1] != nullid:
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# if there is a merge going on and the file was either
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# in state 'm' (-1) or coming from other parent (-2) before
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# being removed, restore that state.
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entry = self._map.get(f)
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if entry is not None:
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if entry[0] == 'r' and entry[2] in (-1, -2):
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source = self._map.copymap.get(f)
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if entry[2] == -1:
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self.merge(f)
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elif entry[2] == -2:
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self.otherparent(f)
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if source:
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self.copy(source, f)
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return
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if entry[0] == 'm' or entry[0] == 'n' and entry[2] == -2:
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return
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self._addpath(f, 'n', 0, -1, -1)
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self._map.copymap.pop(f, None)
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def otherparent(self, f):
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'''Mark as coming from the other parent, always dirty.'''
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if self._pl[1] == nullid:
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raise error.Abort(_("setting %r to other parent "
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"only allowed in merges") % f)
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if f in self and self[f] == 'n':
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# merge-like
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self._addpath(f, 'm', 0, -2, -1)
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else:
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# add-like
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self._addpath(f, 'n', 0, -2, -1)
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self._map.copymap.pop(f, None)
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def add(self, f):
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'''Mark a file added.'''
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self._addpath(f, 'a', 0, -1, -1)
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self._map.copymap.pop(f, None)
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def remove(self, f):
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'''Mark a file removed.'''
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self._dirty = True
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oldstate = self[f]
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size = 0
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if self._pl[1] != nullid:
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entry = self._map.get(f)
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if entry is not None:
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# backup the previous state
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if entry[0] == 'm': # merge
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size = -1
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elif entry[0] == 'n' and entry[2] == -2: # other parent
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size = -2
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self._map.otherparentset.add(f)
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self._updatedfiles.add(f)
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self._map.removefile(f, oldstate, size)
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if size == 0:
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self._map.copymap.pop(f, None)
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def merge(self, f):
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'''Mark a file merged.'''
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if self._pl[1] == nullid:
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return self.normallookup(f)
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return self.otherparent(f)
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def drop(self, f):
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'''Drop a file from the dirstate'''
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oldstate = self[f]
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if self._map.dropfile(f, oldstate):
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self._dirty = True
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self._updatedfiles.add(f)
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self._map.copymap.pop(f, None)
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def _discoverpath(self, path, normed, ignoremissing, exists, storemap):
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if exists is None:
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exists = os.path.lexists(os.path.join(self._root, path))
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if not exists:
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# Maybe a path component exists
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if not ignoremissing and '/' in path:
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d, f = path.rsplit('/', 1)
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d = self._normalize(d, False, ignoremissing, None)
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folded = d + "/" + f
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else:
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# No path components, preserve original case
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folded = path
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else:
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# recursively normalize leading directory components
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# against dirstate
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if '/' in normed:
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d, f = normed.rsplit('/', 1)
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d = self._normalize(d, False, ignoremissing, True)
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r = self._root + "/" + d
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folded = d + "/" + util.fspath(f, r)
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else:
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folded = util.fspath(normed, self._root)
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storemap[normed] = folded
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return folded
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def _normalizefile(self, path, isknown, ignoremissing=False, exists=None):
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normed = util.normcase(path)
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folded = self._map.filefoldmap.get(normed, None)
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if folded is None:
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|
if isknown:
|
|
folded = path
|
|
else:
|
|
folded = self._discoverpath(path, normed, ignoremissing, exists,
|
|
self._map.filefoldmap)
|
|
return folded
|
|
|
|
def _normalize(self, path, isknown, ignoremissing=False, exists=None):
|
|
normed = util.normcase(path)
|
|
folded = self._map.filefoldmap.get(normed, None)
|
|
if folded is None:
|
|
folded = self._map.dirfoldmap.get(normed, None)
|
|
if folded is None:
|
|
if isknown:
|
|
folded = path
|
|
else:
|
|
# store discovered result in dirfoldmap so that future
|
|
# normalizefile calls don't start matching directories
|
|
folded = self._discoverpath(path, normed, ignoremissing, exists,
|
|
self._map.dirfoldmap)
|
|
return folded
|
|
|
|
def normalize(self, path, isknown=False, ignoremissing=False):
|
|
'''
|
|
normalize the case of a pathname when on a casefolding filesystem
|
|
|
|
isknown specifies whether the filename came from walking the
|
|
disk, to avoid extra filesystem access.
|
|
|
|
If ignoremissing is True, missing path are returned
|
|
unchanged. Otherwise, we try harder to normalize possibly
|
|
existing path components.
|
|
|
|
The normalized case is determined based on the following precedence:
|
|
|
|
- version of name already stored in the dirstate
|
|
- version of name stored on disk
|
|
- version provided via command arguments
|
|
'''
|
|
|
|
if self._checkcase:
|
|
return self._normalize(path, isknown, ignoremissing)
|
|
return path
|
|
|
|
def clear(self):
|
|
self._map.clear()
|
|
self._lastnormaltime = 0
|
|
self._updatedfiles.clear()
|
|
self._dirty = True
|
|
|
|
def rebuild(self, parent, allfiles, changedfiles=None):
|
|
if changedfiles is None:
|
|
# Rebuild entire dirstate
|
|
changedfiles = allfiles
|
|
lastnormaltime = self._lastnormaltime
|
|
self.clear()
|
|
self._lastnormaltime = lastnormaltime
|
|
|
|
if self._origpl is None:
|
|
self._origpl = self._pl
|
|
self._map.setparents(parent, nullid)
|
|
for f in changedfiles:
|
|
if f in allfiles:
|
|
self.normallookup(f)
|
|
else:
|
|
self.drop(f)
|
|
|
|
self._dirty = True
|
|
|
|
def identity(self):
|
|
'''Return identity of dirstate itself to detect changing in storage
|
|
|
|
If identity of previous dirstate is equal to this, writing
|
|
changes based on the former dirstate out can keep consistency.
|
|
'''
|
|
return self._map.identity
|
|
|
|
def write(self, tr):
|
|
if not self._dirty:
|
|
return
|
|
|
|
filename = self._filename
|
|
if tr:
|
|
# 'dirstate.write()' is not only for writing in-memory
|
|
# changes out, but also for dropping ambiguous timestamp.
|
|
# delayed writing re-raise "ambiguous timestamp issue".
|
|
# See also the wiki page below for detail:
|
|
# https://www.mercurial-scm.org/wiki/DirstateTransactionPlan
|
|
|
|
# emulate dropping timestamp in 'parsers.pack_dirstate'
|
|
now = _getfsnow(self._opener)
|
|
self._map.clearambiguoustimes(self._updatedfiles, now)
|
|
|
|
# emulate that all 'dirstate.normal' results are written out
|
|
self._lastnormaltime = 0
|
|
self._updatedfiles.clear()
|
|
|
|
# delay writing in-memory changes out
|
|
tr.addfilegenerator('dirstate', (self._filename,),
|
|
self._writedirstate, location='plain')
|
|
return
|
|
|
|
st = self._opener(filename, "w", atomictemp=True, checkambig=True)
|
|
self._writedirstate(st)
|
|
|
|
def addparentchangecallback(self, category, callback):
|
|
"""add a callback to be called when the wd parents are changed
|
|
|
|
Callback will be called with the following arguments:
|
|
dirstate, (oldp1, oldp2), (newp1, newp2)
|
|
|
|
Category is a unique identifier to allow overwriting an old callback
|
|
with a newer callback.
|
|
"""
|
|
self._plchangecallbacks[category] = callback
|
|
|
|
def _writedirstate(self, st):
|
|
# notify callbacks about parents change
|
|
if self._origpl is not None and self._origpl != self._pl:
|
|
for c, callback in sorted(self._plchangecallbacks.iteritems()):
|
|
callback(self, self._origpl, self._pl)
|
|
self._origpl = None
|
|
# use the modification time of the newly created temporary file as the
|
|
# filesystem's notion of 'now'
|
|
now = util.fstat(st).st_mtime & _rangemask
|
|
|
|
# enough 'delaywrite' prevents 'pack_dirstate' from dropping
|
|
# timestamp of each entries in dirstate, because of 'now > mtime'
|
|
delaywrite = self._ui.configint('debug', 'dirstate.delaywrite')
|
|
if delaywrite > 0:
|
|
# do we have any files to delay for?
|
|
for f, e in self._map.iteritems():
|
|
if e[0] == 'n' and e[3] == now:
|
|
import time # to avoid useless import
|
|
# rather than sleep n seconds, sleep until the next
|
|
# multiple of n seconds
|
|
clock = time.time()
|
|
start = int(clock) - (int(clock) % delaywrite)
|
|
end = start + delaywrite
|
|
time.sleep(end - clock)
|
|
now = end # trust our estimate that the end is near now
|
|
break
|
|
|
|
self._map.write(st, now)
|
|
self._lastnormaltime = 0
|
|
self._dirty = False
|
|
|
|
def _dirignore(self, f):
|
|
if f == '.':
|
|
return False
|
|
if self._ignore(f):
|
|
return True
|
|
for p in util.finddirs(f):
|
|
if self._ignore(p):
|
|
return True
|
|
return False
|
|
|
|
def _ignorefiles(self):
|
|
files = []
|
|
if os.path.exists(self._join('.hgignore')):
|
|
files.append(self._join('.hgignore'))
|
|
for name, path in self._ui.configitems("ui"):
|
|
if name == 'ignore' or name.startswith('ignore.'):
|
|
# we need to use os.path.join here rather than self._join
|
|
# because path is arbitrary and user-specified
|
|
files.append(os.path.join(self._rootdir, util.expandpath(path)))
|
|
return files
|
|
|
|
def _ignorefileandline(self, f):
|
|
files = collections.deque(self._ignorefiles())
|
|
visited = set()
|
|
while files:
|
|
i = files.popleft()
|
|
patterns = matchmod.readpatternfile(i, self._ui.warn,
|
|
sourceinfo=True)
|
|
for pattern, lineno, line in patterns:
|
|
kind, p = matchmod._patsplit(pattern, 'glob')
|
|
if kind == "subinclude":
|
|
if p not in visited:
|
|
files.append(p)
|
|
continue
|
|
m = matchmod.match(self._root, '', [], [pattern],
|
|
warn=self._ui.warn)
|
|
if m(f):
|
|
return (i, lineno, line)
|
|
visited.add(i)
|
|
return (None, -1, "")
|
|
|
|
def _walkexplicit(self, match, subrepos):
|
|
'''Get stat data about the files explicitly specified by match.
|
|
|
|
Return a triple (results, dirsfound, dirsnotfound).
|
|
- results is a mapping from filename to stat result. It also contains
|
|
listings mapping subrepos and .hg to None.
|
|
- dirsfound is a list of files found to be directories.
|
|
- dirsnotfound is a list of files that the dirstate thinks are
|
|
directories and that were not found.'''
|
|
|
|
def badtype(mode):
|
|
kind = _('unknown')
|
|
if stat.S_ISCHR(mode):
|
|
kind = _('character device')
|
|
elif stat.S_ISBLK(mode):
|
|
kind = _('block device')
|
|
elif stat.S_ISFIFO(mode):
|
|
kind = _('fifo')
|
|
elif stat.S_ISSOCK(mode):
|
|
kind = _('socket')
|
|
elif stat.S_ISDIR(mode):
|
|
kind = _('directory')
|
|
return _('unsupported file type (type is %s)') % kind
|
|
|
|
matchedir = match.explicitdir
|
|
badfn = match.bad
|
|
dmap = self._map
|
|
lstat = os.lstat
|
|
getkind = stat.S_IFMT
|
|
dirkind = stat.S_IFDIR
|
|
regkind = stat.S_IFREG
|
|
lnkkind = stat.S_IFLNK
|
|
join = self._join
|
|
dirsfound = []
|
|
foundadd = dirsfound.append
|
|
dirsnotfound = []
|
|
notfoundadd = dirsnotfound.append
|
|
|
|
if not match.isexact() and self._checkcase:
|
|
normalize = self._normalize
|
|
else:
|
|
normalize = None
|
|
|
|
files = sorted(match.files())
|
|
subrepos.sort()
|
|
i, j = 0, 0
|
|
while i < len(files) and j < len(subrepos):
|
|
subpath = subrepos[j] + "/"
|
|
if files[i] < subpath:
|
|
i += 1
|
|
continue
|
|
while i < len(files) and files[i].startswith(subpath):
|
|
del files[i]
|
|
j += 1
|
|
|
|
if not files or '.' in files:
|
|
files = ['.']
|
|
results = dict.fromkeys(subrepos)
|
|
results['.hg'] = None
|
|
|
|
for ff in files:
|
|
# constructing the foldmap is expensive, so don't do it for the
|
|
# common case where files is ['.']
|
|
if normalize and ff != '.':
|
|
nf = normalize(ff, False, True)
|
|
else:
|
|
nf = ff
|
|
if nf in results:
|
|
continue
|
|
|
|
try:
|
|
st = lstat(join(nf))
|
|
kind = getkind(st.st_mode)
|
|
if kind == dirkind:
|
|
if nf in dmap:
|
|
# file replaced by dir on disk but still in dirstate
|
|
results[nf] = None
|
|
if matchedir:
|
|
matchedir(nf)
|
|
foundadd((nf, ff))
|
|
elif kind == regkind or kind == lnkkind:
|
|
results[nf] = st
|
|
else:
|
|
badfn(ff, badtype(kind))
|
|
if nf in dmap:
|
|
results[nf] = None
|
|
except OSError as inst: # nf not found on disk - it is dirstate only
|
|
if nf in dmap: # does it exactly match a missing file?
|
|
results[nf] = None
|
|
else: # does it match a missing directory?
|
|
if self._map.hasdir(nf):
|
|
if matchedir:
|
|
matchedir(nf)
|
|
notfoundadd(nf)
|
|
else:
|
|
badfn(ff, encoding.strtolocal(inst.strerror))
|
|
|
|
# Case insensitive filesystems cannot rely on lstat() failing to detect
|
|
# a case-only rename. Prune the stat object for any file that does not
|
|
# match the case in the filesystem, if there are multiple files that
|
|
# normalize to the same path.
|
|
if match.isexact() and self._checkcase:
|
|
normed = {}
|
|
|
|
for f, st in results.iteritems():
|
|
if st is None:
|
|
continue
|
|
|
|
nc = util.normcase(f)
|
|
paths = normed.get(nc)
|
|
|
|
if paths is None:
|
|
paths = set()
|
|
normed[nc] = paths
|
|
|
|
paths.add(f)
|
|
|
|
for norm, paths in normed.iteritems():
|
|
if len(paths) > 1:
|
|
for path in paths:
|
|
folded = self._discoverpath(path, norm, True, None,
|
|
self._map.dirfoldmap)
|
|
if path != folded:
|
|
results[path] = None
|
|
|
|
return results, dirsfound, dirsnotfound
|
|
|
|
def walk(self, match, subrepos, unknown, ignored, full=True):
|
|
'''
|
|
Walk recursively through the directory tree, finding all files
|
|
matched by match.
|
|
|
|
If full is False, maybe skip some known-clean files.
|
|
|
|
Return a dict mapping filename to stat-like object (either
|
|
mercurial.osutil.stat instance or return value of os.stat()).
|
|
|
|
'''
|
|
# full is a flag that extensions that hook into walk can use -- this
|
|
# implementation doesn't use it at all. This satisfies the contract
|
|
# because we only guarantee a "maybe".
|
|
|
|
if ignored:
|
|
ignore = util.never
|
|
dirignore = util.never
|
|
elif unknown:
|
|
ignore = self._ignore
|
|
dirignore = self._dirignore
|
|
else:
|
|
# if not unknown and not ignored, drop dir recursion and step 2
|
|
ignore = util.always
|
|
dirignore = util.always
|
|
|
|
matchfn = match.matchfn
|
|
matchalways = match.always()
|
|
matchtdir = match.traversedir
|
|
dmap = self._map
|
|
listdir = util.listdir
|
|
lstat = os.lstat
|
|
dirkind = stat.S_IFDIR
|
|
regkind = stat.S_IFREG
|
|
lnkkind = stat.S_IFLNK
|
|
join = self._join
|
|
|
|
exact = skipstep3 = False
|
|
if match.isexact(): # match.exact
|
|
exact = True
|
|
dirignore = util.always # skip step 2
|
|
elif match.prefix(): # match.match, no patterns
|
|
skipstep3 = True
|
|
|
|
if not exact and self._checkcase:
|
|
normalize = self._normalize
|
|
normalizefile = self._normalizefile
|
|
skipstep3 = False
|
|
else:
|
|
normalize = self._normalize
|
|
normalizefile = None
|
|
|
|
# step 1: find all explicit files
|
|
results, work, dirsnotfound = self._walkexplicit(match, subrepos)
|
|
|
|
skipstep3 = skipstep3 and not (work or dirsnotfound)
|
|
work = [d for d in work if not dirignore(d[0])]
|
|
|
|
# step 2: visit subdirectories
|
|
def traverse(work, alreadynormed):
|
|
wadd = work.append
|
|
while work:
|
|
nd = work.pop()
|
|
if not match.visitdir(nd):
|
|
continue
|
|
skip = None
|
|
if nd == '.':
|
|
nd = ''
|
|
else:
|
|
skip = '.hg'
|
|
try:
|
|
entries = listdir(join(nd), stat=True, skip=skip)
|
|
except OSError as inst:
|
|
if inst.errno in (errno.EACCES, errno.ENOENT):
|
|
match.bad(self.pathto(nd),
|
|
encoding.strtolocal(inst.strerror))
|
|
continue
|
|
raise
|
|
for f, kind, st in entries:
|
|
if normalizefile:
|
|
# even though f might be a directory, we're only
|
|
# interested in comparing it to files currently in the
|
|
# dmap -- therefore normalizefile is enough
|
|
nf = normalizefile(nd and (nd + "/" + f) or f, True,
|
|
True)
|
|
else:
|
|
nf = nd and (nd + "/" + f) or f
|
|
if nf not in results:
|
|
if kind == dirkind:
|
|
if not ignore(nf):
|
|
if matchtdir:
|
|
matchtdir(nf)
|
|
wadd(nf)
|
|
if nf in dmap and (matchalways or matchfn(nf)):
|
|
results[nf] = None
|
|
elif kind == regkind or kind == lnkkind:
|
|
if nf in dmap:
|
|
if matchalways or matchfn(nf):
|
|
results[nf] = st
|
|
elif ((matchalways or matchfn(nf))
|
|
and not ignore(nf)):
|
|
# unknown file -- normalize if necessary
|
|
if not alreadynormed:
|
|
nf = normalize(nf, False, True)
|
|
results[nf] = st
|
|
elif nf in dmap and (matchalways or matchfn(nf)):
|
|
results[nf] = None
|
|
|
|
for nd, d in work:
|
|
# alreadynormed means that processwork doesn't have to do any
|
|
# expensive directory normalization
|
|
alreadynormed = not normalize or nd == d
|
|
traverse([d], alreadynormed)
|
|
|
|
for s in subrepos:
|
|
del results[s]
|
|
del results['.hg']
|
|
|
|
# step 3: visit remaining files from dmap
|
|
if not skipstep3 and not exact:
|
|
# If a dmap file is not in results yet, it was either
|
|
# a) not matching matchfn b) ignored, c) missing, or d) under a
|
|
# symlink directory.
|
|
if not results and matchalways:
|
|
visit = [f for f in dmap]
|
|
else:
|
|
visit = [f for f in dmap if f not in results and matchfn(f)]
|
|
visit.sort()
|
|
|
|
if unknown:
|
|
# unknown == True means we walked all dirs under the roots
|
|
# that wasn't ignored, and everything that matched was stat'ed
|
|
# and is already in results.
|
|
# The rest must thus be ignored or under a symlink.
|
|
audit_path = pathutil.pathauditor(self._root, cached=True)
|
|
|
|
for nf in iter(visit):
|
|
# If a stat for the same file was already added with a
|
|
# different case, don't add one for this, since that would
|
|
# make it appear as if the file exists under both names
|
|
# on disk.
|
|
if (normalizefile and
|
|
normalizefile(nf, True, True) in results):
|
|
results[nf] = None
|
|
# Report ignored items in the dmap as long as they are not
|
|
# under a symlink directory.
|
|
elif audit_path.check(nf):
|
|
try:
|
|
results[nf] = lstat(join(nf))
|
|
# file was just ignored, no links, and exists
|
|
except OSError:
|
|
# file doesn't exist
|
|
results[nf] = None
|
|
else:
|
|
# It's either missing or under a symlink directory
|
|
# which we in this case report as missing
|
|
results[nf] = None
|
|
else:
|
|
# We may not have walked the full directory tree above,
|
|
# so stat and check everything we missed.
|
|
iv = iter(visit)
|
|
for st in util.statfiles([join(i) for i in visit]):
|
|
results[next(iv)] = st
|
|
return results
|
|
|
|
def status(self, match, subrepos, ignored, clean, unknown):
|
|
'''Determine the status of the working copy relative to the
|
|
dirstate and return a pair of (unsure, status), where status is of type
|
|
scmutil.status and:
|
|
|
|
unsure:
|
|
files that might have been modified since the dirstate was
|
|
written, but need to be read to be sure (size is the same
|
|
but mtime differs)
|
|
status.modified:
|
|
files that have definitely been modified since the dirstate
|
|
was written (different size or mode)
|
|
status.clean:
|
|
files that have definitely not been modified since the
|
|
dirstate was written
|
|
'''
|
|
listignored, listclean, listunknown = ignored, clean, unknown
|
|
lookup, modified, added, unknown, ignored = [], [], [], [], []
|
|
removed, deleted, clean = [], [], []
|
|
|
|
dmap = self._map
|
|
dmap.preload()
|
|
dcontains = dmap.__contains__
|
|
dget = dmap.__getitem__
|
|
ladd = lookup.append # aka "unsure"
|
|
madd = modified.append
|
|
aadd = added.append
|
|
uadd = unknown.append
|
|
iadd = ignored.append
|
|
radd = removed.append
|
|
dadd = deleted.append
|
|
cadd = clean.append
|
|
mexact = match.exact
|
|
dirignore = self._dirignore
|
|
checkexec = self._checkexec
|
|
copymap = self._map.copymap
|
|
lastnormaltime = self._lastnormaltime
|
|
|
|
# We need to do full walks when either
|
|
# - we're listing all clean files, or
|
|
# - match.traversedir does something, because match.traversedir should
|
|
# be called for every dir in the working dir
|
|
full = listclean or match.traversedir is not None
|
|
for fn, st in self.walk(match, subrepos, listunknown, listignored,
|
|
full=full).iteritems():
|
|
if not dcontains(fn):
|
|
if (listignored or mexact(fn)) and dirignore(fn):
|
|
if listignored:
|
|
iadd(fn)
|
|
else:
|
|
uadd(fn)
|
|
continue
|
|
|
|
# This is equivalent to 'state, mode, size, time = dmap[fn]' but not
|
|
# written like that for performance reasons. dmap[fn] is not a
|
|
# Python tuple in compiled builds. The CPython UNPACK_SEQUENCE
|
|
# opcode has fast paths when the value to be unpacked is a tuple or
|
|
# a list, but falls back to creating a full-fledged iterator in
|
|
# general. That is much slower than simply accessing and storing the
|
|
# tuple members one by one.
|
|
t = dget(fn)
|
|
state = t[0]
|
|
mode = t[1]
|
|
size = t[2]
|
|
time = t[3]
|
|
|
|
if not st and state in "nma":
|
|
dadd(fn)
|
|
elif state == 'n':
|
|
if (size >= 0 and
|
|
((size != st.st_size and size != st.st_size & _rangemask)
|
|
or ((mode ^ st.st_mode) & 0o100 and checkexec))
|
|
or size == -2 # other parent
|
|
or fn in copymap):
|
|
madd(fn)
|
|
elif time != st.st_mtime and time != st.st_mtime & _rangemask:
|
|
ladd(fn)
|
|
elif st.st_mtime == lastnormaltime:
|
|
# fn may have just been marked as normal and it may have
|
|
# changed in the same second without changing its size.
|
|
# This can happen if we quickly do multiple commits.
|
|
# Force lookup, so we don't miss such a racy file change.
|
|
ladd(fn)
|
|
elif listclean:
|
|
cadd(fn)
|
|
elif state == 'm':
|
|
madd(fn)
|
|
elif state == 'a':
|
|
aadd(fn)
|
|
elif state == 'r':
|
|
radd(fn)
|
|
|
|
return (lookup, scmutil.status(modified, added, removed, deleted,
|
|
unknown, ignored, clean))
|
|
|
|
def matches(self, match):
|
|
'''
|
|
return files in the dirstate (in whatever state) filtered by match
|
|
'''
|
|
dmap = self._map
|
|
if match.always():
|
|
return dmap.keys()
|
|
files = match.files()
|
|
if match.isexact():
|
|
# fast path -- filter the other way around, since typically files is
|
|
# much smaller than dmap
|
|
return [f for f in files if f in dmap]
|
|
if match.prefix() and all(fn in dmap for fn in files):
|
|
# fast path -- all the values are known to be files, so just return
|
|
# that
|
|
return list(files)
|
|
return [f for f in dmap if match(f)]
|
|
|
|
def _actualfilename(self, tr):
|
|
if tr:
|
|
return self._pendingfilename
|
|
else:
|
|
return self._filename
|
|
|
|
def savebackup(self, tr, backupname):
|
|
'''Save current dirstate into backup file'''
|
|
filename = self._actualfilename(tr)
|
|
assert backupname != filename
|
|
|
|
# use '_writedirstate' instead of 'write' to write changes certainly,
|
|
# because the latter omits writing out if transaction is running.
|
|
# output file will be used to create backup of dirstate at this point.
|
|
if self._dirty or not self._opener.exists(filename):
|
|
self._writedirstate(self._opener(filename, "w", atomictemp=True,
|
|
checkambig=True))
|
|
|
|
if tr:
|
|
# ensure that subsequent tr.writepending returns True for
|
|
# changes written out above, even if dirstate is never
|
|
# changed after this
|
|
tr.addfilegenerator('dirstate', (self._filename,),
|
|
self._writedirstate, location='plain')
|
|
|
|
# ensure that pending file written above is unlinked at
|
|
# failure, even if tr.writepending isn't invoked until the
|
|
# end of this transaction
|
|
tr.registertmp(filename, location='plain')
|
|
|
|
self._opener.tryunlink(backupname)
|
|
# hardlink backup is okay because _writedirstate is always called
|
|
# with an "atomictemp=True" file.
|
|
util.copyfile(self._opener.join(filename),
|
|
self._opener.join(backupname), hardlink=True)
|
|
|
|
def restorebackup(self, tr, backupname):
|
|
'''Restore dirstate by backup file'''
|
|
# this "invalidate()" prevents "wlock.release()" from writing
|
|
# changes of dirstate out after restoring from backup file
|
|
self.invalidate()
|
|
filename = self._actualfilename(tr)
|
|
o = self._opener
|
|
if util.samefile(o.join(backupname), o.join(filename)):
|
|
o.unlink(backupname)
|
|
else:
|
|
o.rename(backupname, filename, checkambig=True)
|
|
|
|
def clearbackup(self, tr, backupname):
|
|
'''Clear backup file'''
|
|
self._opener.unlink(backupname)
|
|
|
|
class dirstatemap(object):
|
|
"""Map encapsulating the dirstate's contents.
|
|
|
|
The dirstate contains the following state:
|
|
|
|
- `identity` is the identity of the dirstate file, which can be used to
|
|
detect when changes have occurred to the dirstate file.
|
|
|
|
- `parents` is a pair containing the parents of the working copy. The
|
|
parents are updated by calling `setparents`.
|
|
|
|
- the state map maps filenames to tuples of (state, mode, size, mtime),
|
|
where state is a single character representing 'normal', 'added',
|
|
'removed', or 'merged'. It is read by treating the dirstate as a
|
|
dict. File state is updated by calling the `addfile`, `removefile` and
|
|
`dropfile` methods.
|
|
|
|
- `copymap` maps destination filenames to their source filename.
|
|
|
|
The dirstate also provides the following views onto the state:
|
|
|
|
- `nonnormalset` is a set of the filenames that have state other
|
|
than 'normal', or are normal but have an mtime of -1 ('normallookup').
|
|
|
|
- `otherparentset` is a set of the filenames that are marked as coming
|
|
from the second parent when the dirstate is currently being merged.
|
|
|
|
- `filefoldmap` is a dict mapping normalized filenames to the denormalized
|
|
form that they appear as in the dirstate.
|
|
|
|
- `dirfoldmap` is a dict mapping normalized directory names to the
|
|
denormalized form that they appear as in the dirstate.
|
|
"""
|
|
|
|
def __init__(self, ui, opener, root):
|
|
self._ui = ui
|
|
self._opener = opener
|
|
self._root = root
|
|
self._filename = 'dirstate'
|
|
|
|
self._parents = None
|
|
self._dirtyparents = False
|
|
|
|
# for consistent view between _pl() and _read() invocations
|
|
self._pendingmode = None
|
|
|
|
@propertycache
|
|
def _map(self):
|
|
self._map = {}
|
|
self.read()
|
|
return self._map
|
|
|
|
@propertycache
|
|
def copymap(self):
|
|
self.copymap = {}
|
|
self._map
|
|
return self.copymap
|
|
|
|
def clear(self):
|
|
self._map.clear()
|
|
self.copymap.clear()
|
|
self.setparents(nullid, nullid)
|
|
util.clearcachedproperty(self, "_dirs")
|
|
util.clearcachedproperty(self, "_alldirs")
|
|
util.clearcachedproperty(self, "filefoldmap")
|
|
util.clearcachedproperty(self, "dirfoldmap")
|
|
util.clearcachedproperty(self, "nonnormalset")
|
|
util.clearcachedproperty(self, "otherparentset")
|
|
|
|
def iteritems(self):
|
|
return self._map.iteritems()
|
|
|
|
def __len__(self):
|
|
return len(self._map)
|
|
|
|
def __iter__(self):
|
|
return iter(self._map)
|
|
|
|
def get(self, key, default=None):
|
|
return self._map.get(key, default)
|
|
|
|
def __contains__(self, key):
|
|
return key in self._map
|
|
|
|
def __getitem__(self, key):
|
|
return self._map[key]
|
|
|
|
def keys(self):
|
|
return self._map.keys()
|
|
|
|
def preload(self):
|
|
"""Loads the underlying data, if it's not already loaded"""
|
|
self._map
|
|
|
|
def addfile(self, f, oldstate, state, mode, size, mtime):
|
|
"""Add a tracked file to the dirstate."""
|
|
if oldstate in "?r" and "_dirs" in self.__dict__:
|
|
self._dirs.addpath(f)
|
|
if oldstate == "?" and "_alldirs" in self.__dict__:
|
|
self._alldirs.addpath(f)
|
|
self._map[f] = dirstatetuple(state, mode, size, mtime)
|
|
if state != 'n' or mtime == -1:
|
|
self.nonnormalset.add(f)
|
|
if size == -2:
|
|
self.otherparentset.add(f)
|
|
|
|
def removefile(self, f, oldstate, size):
|
|
"""
|
|
Mark a file as removed in the dirstate.
|
|
|
|
The `size` parameter is used to store sentinel values that indicate
|
|
the file's previous state. In the future, we should refactor this
|
|
to be more explicit about what that state is.
|
|
"""
|
|
if oldstate not in "?r" and "_dirs" in self.__dict__:
|
|
self._dirs.delpath(f)
|
|
if oldstate == "?" and "_alldirs" in self.__dict__:
|
|
self._alldirs.addpath(f)
|
|
if "filefoldmap" in self.__dict__:
|
|
normed = util.normcase(f)
|
|
self.filefoldmap.pop(normed, None)
|
|
self._map[f] = dirstatetuple('r', 0, size, 0)
|
|
self.nonnormalset.add(f)
|
|
|
|
def dropfile(self, f, oldstate):
|
|
"""
|
|
Remove a file from the dirstate. Returns True if the file was
|
|
previously recorded.
|
|
"""
|
|
exists = self._map.pop(f, None) is not None
|
|
if exists:
|
|
if oldstate != "r" and "_dirs" in self.__dict__:
|
|
self._dirs.delpath(f)
|
|
if "_alldirs" in self.__dict__:
|
|
self._alldirs.delpath(f)
|
|
if "filefoldmap" in self.__dict__:
|
|
normed = util.normcase(f)
|
|
self.filefoldmap.pop(normed, None)
|
|
self.nonnormalset.discard(f)
|
|
return exists
|
|
|
|
def clearambiguoustimes(self, files, now):
|
|
for f in files:
|
|
e = self.get(f)
|
|
if e is not None and e[0] == 'n' and e[3] == now:
|
|
self._map[f] = dirstatetuple(e[0], e[1], e[2], -1)
|
|
self.nonnormalset.add(f)
|
|
|
|
def nonnormalentries(self):
|
|
'''Compute the nonnormal dirstate entries from the dmap'''
|
|
try:
|
|
return parsers.nonnormalotherparententries(self._map)
|
|
except AttributeError:
|
|
nonnorm = set()
|
|
otherparent = set()
|
|
for fname, e in self._map.iteritems():
|
|
if e[0] != 'n' or e[3] == -1:
|
|
nonnorm.add(fname)
|
|
if e[0] == 'n' and e[2] == -2:
|
|
otherparent.add(fname)
|
|
return nonnorm, otherparent
|
|
|
|
@propertycache
|
|
def filefoldmap(self):
|
|
"""Returns a dictionary mapping normalized case paths to their
|
|
non-normalized versions.
|
|
"""
|
|
try:
|
|
makefilefoldmap = parsers.make_file_foldmap
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
return makefilefoldmap(self._map, util.normcasespec,
|
|
util.normcasefallback)
|
|
|
|
f = {}
|
|
normcase = util.normcase
|
|
for name, s in self._map.iteritems():
|
|
if s[0] != 'r':
|
|
f[normcase(name)] = name
|
|
f['.'] = '.' # prevents useless util.fspath() invocation
|
|
return f
|
|
|
|
def hastrackeddir(self, d):
|
|
"""
|
|
Returns True if the dirstate contains a tracked (not removed) file
|
|
in this directory.
|
|
"""
|
|
return d in self._dirs
|
|
|
|
def hasdir(self, d):
|
|
"""
|
|
Returns True if the dirstate contains a file (tracked or removed)
|
|
in this directory.
|
|
"""
|
|
return d in self._alldirs
|
|
|
|
@propertycache
|
|
def _dirs(self):
|
|
return util.dirs(self._map, 'r')
|
|
|
|
@propertycache
|
|
def _alldirs(self):
|
|
return util.dirs(self._map)
|
|
|
|
def _opendirstatefile(self):
|
|
fp, mode = txnutil.trypending(self._root, self._opener, self._filename)
|
|
if self._pendingmode is not None and self._pendingmode != mode:
|
|
fp.close()
|
|
raise error.Abort(_('working directory state may be '
|
|
'changed parallelly'))
|
|
self._pendingmode = mode
|
|
return fp
|
|
|
|
def parents(self):
|
|
if not self._parents:
|
|
try:
|
|
fp = self._opendirstatefile()
|
|
st = fp.read(40)
|
|
fp.close()
|
|
except IOError as err:
|
|
if err.errno != errno.ENOENT:
|
|
raise
|
|
# File doesn't exist, so the current state is empty
|
|
st = ''
|
|
|
|
l = len(st)
|
|
if l == 40:
|
|
self._parents = st[:20], st[20:40]
|
|
elif l == 0:
|
|
self._parents = [nullid, nullid]
|
|
else:
|
|
raise error.Abort(_('working directory state appears '
|
|
'damaged!'))
|
|
|
|
return self._parents
|
|
|
|
def setparents(self, p1, p2):
|
|
self._parents = (p1, p2)
|
|
self._dirtyparents = True
|
|
|
|
def read(self):
|
|
# ignore HG_PENDING because identity is used only for writing
|
|
self.identity = util.filestat.frompath(
|
|
self._opener.join(self._filename))
|
|
|
|
try:
|
|
fp = self._opendirstatefile()
|
|
try:
|
|
st = fp.read()
|
|
finally:
|
|
fp.close()
|
|
except IOError as err:
|
|
if err.errno != errno.ENOENT:
|
|
raise
|
|
return
|
|
if not st:
|
|
return
|
|
|
|
if util.safehasattr(parsers, 'dict_new_presized'):
|
|
# Make an estimate of the number of files in the dirstate based on
|
|
# its size. From a linear regression on a set of real-world repos,
|
|
# all over 10,000 files, the size of a dirstate entry is 85
|
|
# bytes. The cost of resizing is significantly higher than the cost
|
|
# of filling in a larger presized dict, so subtract 20% from the
|
|
# size.
|
|
#
|
|
# This heuristic is imperfect in many ways, so in a future dirstate
|
|
# format update it makes sense to just record the number of entries
|
|
# on write.
|
|
self._map = parsers.dict_new_presized(len(st) / 71)
|
|
|
|
# Python's garbage collector triggers a GC each time a certain number
|
|
# of container objects (the number being defined by
|
|
# gc.get_threshold()) are allocated. parse_dirstate creates a tuple
|
|
# for each file in the dirstate. The C version then immediately marks
|
|
# them as not to be tracked by the collector. However, this has no
|
|
# effect on when GCs are triggered, only on what objects the GC looks
|
|
# into. This means that O(number of files) GCs are unavoidable.
|
|
# Depending on when in the process's lifetime the dirstate is parsed,
|
|
# this can get very expensive. As a workaround, disable GC while
|
|
# parsing the dirstate.
|
|
#
|
|
# (we cannot decorate the function directly since it is in a C module)
|
|
parse_dirstate = util.nogc(parsers.parse_dirstate)
|
|
p = parse_dirstate(self._map, self.copymap, st)
|
|
if not self._dirtyparents:
|
|
self.setparents(*p)
|
|
|
|
# Avoid excess attribute lookups by fast pathing certain checks
|
|
self.__contains__ = self._map.__contains__
|
|
self.__getitem__ = self._map.__getitem__
|
|
self.get = self._map.get
|
|
|
|
def write(self, st, now):
|
|
st.write(parsers.pack_dirstate(self._map, self.copymap,
|
|
self.parents(), now))
|
|
st.close()
|
|
self._dirtyparents = False
|
|
self.nonnormalset, self.otherparentset = self.nonnormalentries()
|
|
|
|
@propertycache
|
|
def nonnormalset(self):
|
|
nonnorm, otherparents = self.nonnormalentries()
|
|
self.otherparentset = otherparents
|
|
return nonnorm
|
|
|
|
@propertycache
|
|
def otherparentset(self):
|
|
nonnorm, otherparents = self.nonnormalentries()
|
|
self.nonnormalset = nonnorm
|
|
return otherparents
|
|
|
|
@propertycache
|
|
def identity(self):
|
|
self._map
|
|
return self.identity
|
|
|
|
@propertycache
|
|
def dirfoldmap(self):
|
|
f = {}
|
|
normcase = util.normcase
|
|
for name in self._dirs:
|
|
f[normcase(name)] = name
|
|
return f
|