mirror of
https://github.com/facebook/sapling.git
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ba69ca47d4
The initial attempt was to discard cache when appropriate, but it appears to be error prone. We had to carefully inspect all places where audit() is called e.g. without actually updating filesystem, before removing files and directories, etc. So, this patch disables the cache of audited paths by default, and enables it only for the following cases: - short-lived auditor objects - repo.vfs, repo.svfs, and repo.cachevfs, which are managed directories and considered sort of append-only (a file/directory would never be replaced with a symlink) There would be more cacheable vfs objects (e.g. mq.queue.opener), but I decided not to inspect all of them in this patch. We can make them cached later. Benchmark result: - using old clone of http://selenic.com/repo/linux-2.6/ (38319 files) - on tmpfs - run HGRCPATH=/dev/null hg up -q --time tip && hg up -q null - try 4 times and take the last three results original: real 7.480 secs (user 1.140+22.760 sys 0.150+1.690) real 8.010 secs (user 1.070+22.280 sys 0.170+2.120) real 7.470 secs (user 1.120+22.390 sys 0.120+1.910) clearcache (the other series): real 7.680 secs (user 1.120+23.420 sys 0.140+1.970) real 7.670 secs (user 1.110+23.620 sys 0.130+1.810) real 7.740 secs (user 1.090+23.510 sys 0.160+1.940) enable cache only for vfs and svfs (this series): real 8.730 secs (user 1.500+25.190 sys 0.260+2.260) real 8.750 secs (user 1.490+25.170 sys 0.250+2.340) real 9.010 secs (user 1.680+25.340 sys 0.280+2.540) remove cache function at all (for reference): real 9.620 secs (user 1.440+27.120 sys 0.250+2.980) real 9.420 secs (user 1.400+26.940 sys 0.320+3.130) real 9.760 secs (user 1.530+27.270 sys 0.250+2.970)
650 lines
22 KiB
Python
650 lines
22 KiB
Python
# vfs.py - Mercurial 'vfs' classes
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#
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# Copyright 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 contextlib
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import errno
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import os
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import shutil
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import stat
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import tempfile
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import threading
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from .i18n import _
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from . import (
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encoding,
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error,
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pathutil,
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pycompat,
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util,
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)
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def _avoidambig(path, oldstat):
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"""Avoid file stat ambiguity forcibly
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This function causes copying ``path`` file, if it is owned by
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another (see issue5418 and issue5584 for detail).
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"""
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def checkandavoid():
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newstat = util.filestat.frompath(path)
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# return whether file stat ambiguity is (already) avoided
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return (not newstat.isambig(oldstat) or
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newstat.avoidambig(path, oldstat))
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if not checkandavoid():
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# simply copy to change owner of path to get privilege to
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# advance mtime (see issue5418)
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util.rename(util.mktempcopy(path), path)
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checkandavoid()
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class abstractvfs(object):
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"""Abstract base class; cannot be instantiated"""
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def __init__(self, *args, **kwargs):
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'''Prevent instantiation; don't call this from subclasses.'''
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raise NotImplementedError('attempted instantiating ' + str(type(self)))
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def tryread(self, path):
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'''gracefully return an empty string for missing files'''
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try:
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return self.read(path)
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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 ""
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def tryreadlines(self, path, mode='rb'):
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'''gracefully return an empty array for missing files'''
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try:
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return self.readlines(path, mode=mode)
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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 []
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@util.propertycache
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def open(self):
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'''Open ``path`` file, which is relative to vfs root.
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Newly created directories are marked as "not to be indexed by
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the content indexing service", if ``notindexed`` is specified
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for "write" mode access.
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'''
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return self.__call__
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def read(self, path):
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with self(path, 'rb') as fp:
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return fp.read()
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def readlines(self, path, mode='rb'):
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with self(path, mode=mode) as fp:
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return fp.readlines()
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def write(self, path, data, backgroundclose=False):
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with self(path, 'wb', backgroundclose=backgroundclose) as fp:
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return fp.write(data)
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def writelines(self, path, data, mode='wb', notindexed=False):
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with self(path, mode=mode, notindexed=notindexed) as fp:
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return fp.writelines(data)
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def append(self, path, data):
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with self(path, 'ab') as fp:
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return fp.write(data)
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def basename(self, path):
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"""return base element of a path (as os.path.basename would do)
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This exists to allow handling of strange encoding if needed."""
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return os.path.basename(path)
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def chmod(self, path, mode):
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return os.chmod(self.join(path), mode)
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def dirname(self, path):
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"""return dirname element of a path (as os.path.dirname would do)
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This exists to allow handling of strange encoding if needed."""
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return os.path.dirname(path)
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def exists(self, path=None):
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return os.path.exists(self.join(path))
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def fstat(self, fp):
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return util.fstat(fp)
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def isdir(self, path=None):
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return os.path.isdir(self.join(path))
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def isfile(self, path=None):
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return os.path.isfile(self.join(path))
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def islink(self, path=None):
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return os.path.islink(self.join(path))
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def isfileorlink(self, path=None):
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'''return whether path is a regular file or a symlink
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Unlike isfile, this doesn't follow symlinks.'''
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try:
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st = self.lstat(path)
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except OSError:
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return False
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mode = st.st_mode
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return stat.S_ISREG(mode) or stat.S_ISLNK(mode)
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def reljoin(self, *paths):
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"""join various elements of a path together (as os.path.join would do)
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The vfs base is not injected so that path stay relative. This exists
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to allow handling of strange encoding if needed."""
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return os.path.join(*paths)
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def split(self, path):
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"""split top-most element of a path (as os.path.split would do)
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This exists to allow handling of strange encoding if needed."""
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return os.path.split(path)
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def lexists(self, path=None):
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return os.path.lexists(self.join(path))
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def lstat(self, path=None):
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return os.lstat(self.join(path))
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def listdir(self, path=None):
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return os.listdir(self.join(path))
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def makedir(self, path=None, notindexed=True):
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return util.makedir(self.join(path), notindexed)
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def makedirs(self, path=None, mode=None):
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return util.makedirs(self.join(path), mode)
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def makelock(self, info, path):
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return util.makelock(info, self.join(path))
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def mkdir(self, path=None):
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return os.mkdir(self.join(path))
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def mkstemp(self, suffix='', prefix='tmp', dir=None, text=False):
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fd, name = tempfile.mkstemp(suffix=suffix, prefix=prefix,
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dir=self.join(dir), text=text)
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dname, fname = util.split(name)
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if dir:
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return fd, os.path.join(dir, fname)
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else:
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return fd, fname
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def readdir(self, path=None, stat=None, skip=None):
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return util.listdir(self.join(path), stat, skip)
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def readlock(self, path):
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return util.readlock(self.join(path))
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def rename(self, src, dst, checkambig=False):
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"""Rename from src to dst
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checkambig argument is used with util.filestat, and is useful
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only if destination file is guarded by any lock
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(e.g. repo.lock or repo.wlock).
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To avoid file stat ambiguity forcibly, checkambig=True involves
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copying ``src`` file, if it is owned by another. Therefore, use
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checkambig=True only in limited cases (see also issue5418 and
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issue5584 for detail).
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"""
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srcpath = self.join(src)
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dstpath = self.join(dst)
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oldstat = checkambig and util.filestat.frompath(dstpath)
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if oldstat and oldstat.stat:
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ret = util.rename(srcpath, dstpath)
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_avoidambig(dstpath, oldstat)
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return ret
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return util.rename(srcpath, dstpath)
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def readlink(self, path):
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return os.readlink(self.join(path))
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def removedirs(self, path=None):
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"""Remove a leaf directory and all empty intermediate ones
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"""
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return util.removedirs(self.join(path))
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def rmtree(self, path=None, ignore_errors=False, forcibly=False):
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"""Remove a directory tree recursively
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If ``forcibly``, this tries to remove READ-ONLY files, too.
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"""
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if forcibly:
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def onerror(function, path, excinfo):
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if function is not os.remove:
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raise
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# read-only files cannot be unlinked under Windows
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s = os.stat(path)
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if (s.st_mode & stat.S_IWRITE) != 0:
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raise
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os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE)
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os.remove(path)
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else:
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onerror = None
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return shutil.rmtree(self.join(path),
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ignore_errors=ignore_errors, onerror=onerror)
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def setflags(self, path, l, x):
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return util.setflags(self.join(path), l, x)
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def stat(self, path=None):
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return os.stat(self.join(path))
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def unlink(self, path=None):
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return util.unlink(self.join(path))
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def tryunlink(self, path=None):
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"""Attempt to remove a file, ignoring missing file errors."""
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util.tryunlink(self.join(path))
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def unlinkpath(self, path=None, ignoremissing=False):
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return util.unlinkpath(self.join(path), ignoremissing=ignoremissing)
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def utime(self, path=None, t=None):
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return os.utime(self.join(path), t)
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def walk(self, path=None, onerror=None):
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"""Yield (dirpath, dirs, files) tuple for each directories under path
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``dirpath`` is relative one from the root of this vfs. This
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uses ``os.sep`` as path separator, even you specify POSIX
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style ``path``.
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"The root of this vfs" is represented as empty ``dirpath``.
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"""
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root = os.path.normpath(self.join(None))
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# when dirpath == root, dirpath[prefixlen:] becomes empty
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# because len(dirpath) < prefixlen.
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prefixlen = len(pathutil.normasprefix(root))
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for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror):
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yield (dirpath[prefixlen:], dirs, files)
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@contextlib.contextmanager
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def backgroundclosing(self, ui, expectedcount=-1):
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"""Allow files to be closed asynchronously.
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When this context manager is active, ``backgroundclose`` can be passed
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to ``__call__``/``open`` to result in the file possibly being closed
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asynchronously, on a background thread.
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"""
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# This is an arbitrary restriction and could be changed if we ever
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# have a use case.
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vfs = getattr(self, 'vfs', self)
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if getattr(vfs, '_backgroundfilecloser', None):
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raise error.Abort(
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_('can only have 1 active background file closer'))
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with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc:
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try:
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vfs._backgroundfilecloser = bfc
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yield bfc
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finally:
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vfs._backgroundfilecloser = None
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class vfs(abstractvfs):
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'''Operate files relative to a base directory
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This class is used to hide the details of COW semantics and
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remote file access from higher level code.
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'cacheaudited' should be enabled only if (a) vfs object is short-lived, or
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(b) the base directory is managed by hg and considered sort-of append-only.
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See pathutil.pathauditor() for details.
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'''
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def __init__(self, base, audit=True, cacheaudited=False, expandpath=False,
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realpath=False):
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if expandpath:
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base = util.expandpath(base)
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if realpath:
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base = os.path.realpath(base)
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self.base = base
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self._audit = audit
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if audit:
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self.audit = pathutil.pathauditor(self.base, cached=cacheaudited)
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else:
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self.audit = (lambda path, mode=None: True)
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self.createmode = None
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self._trustnlink = None
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@util.propertycache
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def _cansymlink(self):
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return util.checklink(self.base)
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@util.propertycache
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def _chmod(self):
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return util.checkexec(self.base)
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def _fixfilemode(self, name):
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if self.createmode is None or not self._chmod:
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return
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os.chmod(name, self.createmode & 0o666)
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def __call__(self, path, mode="r", text=False, atomictemp=False,
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notindexed=False, backgroundclose=False, checkambig=False,
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auditpath=True):
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'''Open ``path`` file, which is relative to vfs root.
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Newly created directories are marked as "not to be indexed by
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the content indexing service", if ``notindexed`` is specified
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for "write" mode access.
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If ``backgroundclose`` is passed, the file may be closed asynchronously.
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It can only be used if the ``self.backgroundclosing()`` context manager
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is active. This should only be specified if the following criteria hold:
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1. There is a potential for writing thousands of files. Unless you
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are writing thousands of files, the performance benefits of
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asynchronously closing files is not realized.
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2. Files are opened exactly once for the ``backgroundclosing``
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active duration and are therefore free of race conditions between
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closing a file on a background thread and reopening it. (If the
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file were opened multiple times, there could be unflushed data
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because the original file handle hasn't been flushed/closed yet.)
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``checkambig`` argument is passed to atomictemplfile (valid
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only for writing), and is useful only if target file is
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guarded by any lock (e.g. repo.lock or repo.wlock).
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To avoid file stat ambiguity forcibly, checkambig=True involves
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copying ``path`` file opened in "append" mode (e.g. for
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truncation), if it is owned by another. Therefore, use
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combination of append mode and checkambig=True only in limited
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cases (see also issue5418 and issue5584 for detail).
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'''
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if auditpath:
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if self._audit:
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r = util.checkosfilename(path)
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if r:
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raise error.Abort("%s: %r" % (r, path))
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self.audit(path, mode=mode)
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f = self.join(path)
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if not text and "b" not in mode:
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mode += "b" # for that other OS
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nlink = -1
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if mode not in ('r', 'rb'):
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dirname, basename = util.split(f)
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# If basename is empty, then the path is malformed because it points
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# to a directory. Let the posixfile() call below raise IOError.
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if basename:
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if atomictemp:
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util.makedirs(dirname, self.createmode, notindexed)
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return util.atomictempfile(f, mode, self.createmode,
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checkambig=checkambig)
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try:
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if 'w' in mode:
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util.unlink(f)
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nlink = 0
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else:
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# nlinks() may behave differently for files on Windows
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# shares if the file is open.
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with util.posixfile(f):
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nlink = util.nlinks(f)
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if nlink < 1:
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nlink = 2 # force mktempcopy (issue1922)
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except (OSError, IOError) as e:
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if e.errno != errno.ENOENT:
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raise
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nlink = 0
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util.makedirs(dirname, self.createmode, notindexed)
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if nlink > 0:
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if self._trustnlink is None:
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self._trustnlink = nlink > 1 or util.checknlink(f)
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if nlink > 1 or not self._trustnlink:
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util.rename(util.mktempcopy(f), f)
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fp = util.posixfile(f, mode)
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if nlink == 0:
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self._fixfilemode(f)
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if checkambig:
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if mode in ('r', 'rb'):
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raise error.Abort(_('implementation error: mode %s is not'
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' valid for checkambig=True') % mode)
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fp = checkambigatclosing(fp)
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if backgroundclose:
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if not self._backgroundfilecloser:
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raise error.Abort(_('backgroundclose can only be used when a '
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'backgroundclosing context manager is active')
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)
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fp = delayclosedfile(fp, self._backgroundfilecloser)
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return fp
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def symlink(self, src, dst):
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self.audit(dst)
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linkname = self.join(dst)
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util.tryunlink(linkname)
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util.makedirs(os.path.dirname(linkname), self.createmode)
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if self._cansymlink:
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try:
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os.symlink(src, linkname)
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except OSError as err:
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raise OSError(err.errno, _('could not symlink to %r: %s') %
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(src, encoding.strtolocal(err.strerror)),
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linkname)
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else:
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self.write(dst, src)
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def join(self, path, *insidef):
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if path:
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return os.path.join(self.base, path, *insidef)
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else:
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return self.base
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opener = vfs
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class proxyvfs(object):
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def __init__(self, vfs):
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self.vfs = vfs
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@property
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def options(self):
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return self.vfs.options
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@options.setter
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def options(self, value):
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self.vfs.options = value
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class filtervfs(abstractvfs, proxyvfs):
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'''Wrapper vfs for filtering filenames with a function.'''
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def __init__(self, vfs, filter):
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proxyvfs.__init__(self, vfs)
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self._filter = filter
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def __call__(self, path, *args, **kwargs):
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return self.vfs(self._filter(path), *args, **kwargs)
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def join(self, path, *insidef):
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if path:
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return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef)))
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else:
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return self.vfs.join(path)
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filteropener = filtervfs
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class readonlyvfs(abstractvfs, proxyvfs):
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'''Wrapper vfs preventing any writing.'''
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def __init__(self, vfs):
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proxyvfs.__init__(self, vfs)
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def __call__(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rb'):
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raise error.Abort(_('this vfs is read only'))
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return self.vfs(path, mode, *args, **kw)
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def join(self, path, *insidef):
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return self.vfs.join(path, *insidef)
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class closewrapbase(object):
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"""Base class of wrapper, which hooks closing
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Do not instantiate outside of the vfs layer.
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"""
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def __init__(self, fh):
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object.__setattr__(self, r'_origfh', fh)
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def __getattr__(self, attr):
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return getattr(self._origfh, attr)
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def __setattr__(self, attr, value):
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return setattr(self._origfh, attr, value)
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def __delattr__(self, attr):
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return delattr(self._origfh, attr)
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def __enter__(self):
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return self._origfh.__enter__()
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def __exit__(self, exc_type, exc_value, exc_tb):
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raise NotImplementedError('attempted instantiating ' + str(type(self)))
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def close(self):
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raise NotImplementedError('attempted instantiating ' + str(type(self)))
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class delayclosedfile(closewrapbase):
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"""Proxy for a file object whose close is delayed.
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Do not instantiate outside of the vfs layer.
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"""
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def __init__(self, fh, closer):
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super(delayclosedfile, self).__init__(fh)
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object.__setattr__(self, r'_closer', closer)
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def __exit__(self, exc_type, exc_value, exc_tb):
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self._closer.close(self._origfh)
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def close(self):
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self._closer.close(self._origfh)
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class backgroundfilecloser(object):
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"""Coordinates background closing of file handles on multiple threads."""
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def __init__(self, ui, expectedcount=-1):
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self._running = False
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self._entered = False
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self._threads = []
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self._threadexception = None
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# Only Windows/NTFS has slow file closing. So only enable by default
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# on that platform. But allow to be enabled elsewhere for testing.
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defaultenabled = pycompat.osname == 'nt'
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enabled = ui.configbool('worker', 'backgroundclose', defaultenabled)
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if not enabled:
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return
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# There is overhead to starting and stopping the background threads.
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# Don't do background processing unless the file count is large enough
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# to justify it.
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minfilecount = ui.configint('worker', 'backgroundcloseminfilecount')
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# FUTURE dynamically start background threads after minfilecount closes.
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# (We don't currently have any callers that don't know their file count)
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if expectedcount > 0 and expectedcount < minfilecount:
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return
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maxqueue = ui.configint('worker', 'backgroundclosemaxqueue')
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threadcount = ui.configint('worker', 'backgroundclosethreadcount')
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ui.debug('starting %d threads for background file closing\n' %
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threadcount)
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self._queue = util.queue(maxsize=maxqueue)
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self._running = True
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for i in range(threadcount):
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t = threading.Thread(target=self._worker, name='backgroundcloser')
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self._threads.append(t)
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t.start()
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def __enter__(self):
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self._entered = True
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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self._running = False
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# Wait for threads to finish closing so open files don't linger for
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# longer than lifetime of context manager.
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for t in self._threads:
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t.join()
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def _worker(self):
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"""Main routine for worker thread."""
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while True:
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try:
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fh = self._queue.get(block=True, timeout=0.100)
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# Need to catch or the thread will terminate and
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# we could orphan file descriptors.
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try:
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fh.close()
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except Exception as e:
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# Stash so can re-raise from main thread later.
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self._threadexception = e
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except util.empty:
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if not self._running:
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break
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def close(self, fh):
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"""Schedule a file for closing."""
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if not self._entered:
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raise error.Abort(_('can only call close() when context manager '
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'active'))
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# If a background thread encountered an exception, raise now so we fail
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# fast. Otherwise we may potentially go on for minutes until the error
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# is acted on.
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if self._threadexception:
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e = self._threadexception
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self._threadexception = None
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raise e
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# If we're not actively running, close synchronously.
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if not self._running:
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fh.close()
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return
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self._queue.put(fh, block=True, timeout=None)
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class checkambigatclosing(closewrapbase):
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"""Proxy for a file object, to avoid ambiguity of file stat
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See also util.filestat for detail about "ambiguity of file stat".
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This proxy is useful only if the target file is guarded by any
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lock (e.g. repo.lock or repo.wlock)
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Do not instantiate outside of the vfs layer.
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"""
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def __init__(self, fh):
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super(checkambigatclosing, self).__init__(fh)
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object.__setattr__(self, r'_oldstat', util.filestat.frompath(fh.name))
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def _checkambig(self):
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oldstat = self._oldstat
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if oldstat.stat:
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_avoidambig(self._origfh.name, oldstat)
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def __exit__(self, exc_type, exc_value, exc_tb):
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self._origfh.__exit__(exc_type, exc_value, exc_tb)
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self._checkambig()
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def close(self):
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self._origfh.close()
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self._checkambig()
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