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# __init__.py - fsmonitor initialization and overrides
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#
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# Copyright 2013-2016 Facebook, Inc.
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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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'''Faster status operations with the Watchman file monitor (EXPERIMENTAL)
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Integrates the file-watching program Watchman with Mercurial to produce faster
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status results.
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On a particular Linux system, for a real-world repository with over 400,000
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files hosted on ext4, vanilla `hg status` takes 1.3 seconds. On the same
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system, with fsmonitor it takes about 0.3 seconds.
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fsmonitor requires no configuration -- it will tell Watchman about your
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repository as necessary. You'll need to install Watchman from
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https://facebook.github.io/watchman/ and make sure it is in your PATH.
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The following configuration options exist:
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::
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[fsmonitor]
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mode = {off, on, paranoid}
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When `mode = off`, fsmonitor will disable itself (similar to not loading the
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extension at all). When `mode = on`, fsmonitor will be enabled (the default).
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When `mode = paranoid`, fsmonitor will query both Watchman and the filesystem,
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and ensure that the results are consistent.
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::
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[fsmonitor]
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timeout = (float)
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A value, in seconds, that determines how long fsmonitor will wait for Watchman
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to return results. Defaults to `2.0`.
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::
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[fsmonitor]
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blacklistusers = (list of userids)
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A list of usernames for which fsmonitor will disable itself altogether.
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::
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[fsmonitor]
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walk_on_invalidate = (boolean)
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Whether or not to walk the whole repo ourselves when our cached state has been
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invalidated, for example when Watchman has been restarted or .hgignore rules
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have been changed. Walking the repo in that case can result in competing for
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I/O with Watchman. For large repos it is recommended to set this value to
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false. You may wish to set this to true if you have a very fast filesystem
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that can outpace the IPC overhead of getting the result data for the full repo
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from Watchman. Defaults to false.
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fsmonitor is incompatible with the largefiles and eol extensions, and
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will disable itself if any of those are active.
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'''
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# Platforms Supported
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# ===================
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#
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# **Linux:** *Stable*. Watchman and fsmonitor are both known to work reliably,
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# even under severe loads.
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#
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# **Mac OS X:** *Stable*. The Mercurial test suite passes with fsmonitor
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# turned on, on case-insensitive HFS+. There has been a reasonable amount of
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# user testing under normal loads.
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#
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# **Solaris, BSD:** *Alpha*. watchman and fsmonitor are believed to work, but
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# very little testing has been done.
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#
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# **Windows:** *Alpha*. Not in a release version of watchman or fsmonitor yet.
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#
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# Known Issues
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# ============
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#
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# * fsmonitor will disable itself if any of the following extensions are
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# enabled: largefiles, inotify, eol; or if the repository has subrepos.
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# * fsmonitor will produce incorrect results if nested repos that are not
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# subrepos exist. *Workaround*: add nested repo paths to your `.hgignore`.
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#
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# The issues related to nested repos and subrepos are probably not fundamental
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# ones. Patches to fix them are welcome.
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from __future__ import absolute_import
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import os
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import stat
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import sys
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from mercurial import (
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context,
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extensions,
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localrepo,
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pathutil,
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scmutil,
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util,
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)
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from mercurial import match as matchmod
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from mercurial.i18n import _
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from . import (
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state,
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watchmanclient,
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)
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# Note for extension authors: ONLY specify testedwith = 'internal' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'internal'
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# This extension is incompatible with the following blacklisted extensions
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# and will disable itself when encountering one of these:
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_blacklist = ['largefiles', 'eol']
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def _handleunavailable(ui, state, ex):
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"""Exception handler for Watchman interaction exceptions"""
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if isinstance(ex, watchmanclient.Unavailable):
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if ex.warn:
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ui.warn(str(ex) + '\n')
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if ex.invalidate:
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state.invalidate()
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ui.log('fsmonitor', 'Watchman unavailable: %s\n', ex.msg)
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else:
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ui.log('fsmonitor', 'Watchman exception: %s\n', ex)
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def _hashignore(ignore):
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"""Calculate hash for ignore patterns and filenames
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If this information changes between Mercurial invocations, we can't
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rely on Watchman information anymore and have to re-scan the working
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copy.
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"""
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sha1 = util.sha1()
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if util.safehasattr(ignore, 'includepat'):
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sha1.update(ignore.includepat)
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sha1.update('\0\0')
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if util.safehasattr(ignore, 'excludepat'):
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sha1.update(ignore.excludepat)
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sha1.update('\0\0')
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if util.safehasattr(ignore, 'patternspat'):
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sha1.update(ignore.patternspat)
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sha1.update('\0\0')
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if util.safehasattr(ignore, '_files'):
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for f in ignore._files:
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sha1.update(f)
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sha1.update('\0')
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return sha1.hexdigest()
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def overridewalk(orig, self, match, subrepos, unknown, ignored, full=True):
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'''Replacement for dirstate.walk, hooking into Watchman.
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Whenever full is False, ignored is False, and the Watchman client is
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available, use Watchman combined with saved state to possibly return only a
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subset of files.'''
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def bail():
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return orig(match, subrepos, unknown, ignored, full=True)
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if full or ignored or not self._watchmanclient.available():
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return bail()
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state = self._fsmonitorstate
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clock, ignorehash, notefiles = state.get()
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if not clock:
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if state.walk_on_invalidate:
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return bail()
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# Initial NULL clock value, see
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# https://facebook.github.io/watchman/docs/clockspec.html
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clock = 'c:0:0'
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notefiles = []
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def fwarn(f, msg):
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self._ui.warn('%s: %s\n' % (self.pathto(f), msg))
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return False
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def badtype(mode):
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kind = _('unknown')
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if stat.S_ISCHR(mode):
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kind = _('character device')
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elif stat.S_ISBLK(mode):
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kind = _('block device')
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elif stat.S_ISFIFO(mode):
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kind = _('fifo')
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elif stat.S_ISSOCK(mode):
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kind = _('socket')
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elif stat.S_ISDIR(mode):
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kind = _('directory')
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return _('unsupported file type (type is %s)') % kind
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ignore = self._ignore
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dirignore = self._dirignore
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if unknown:
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if _hashignore(ignore) != ignorehash and clock != 'c:0:0':
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# ignore list changed -- can't rely on Watchman state any more
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if state.walk_on_invalidate:
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return bail()
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notefiles = []
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clock = 'c:0:0'
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else:
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# always ignore
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ignore = util.always
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dirignore = util.always
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matchfn = match.matchfn
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matchalways = match.always()
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dmap = self._map
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nonnormalset = getattr(self, '_nonnormalset', None)
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copymap = self._copymap
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getkind = stat.S_IFMT
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dirkind = stat.S_IFDIR
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regkind = stat.S_IFREG
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lnkkind = stat.S_IFLNK
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join = self._join
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normcase = util.normcase
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fresh_instance = False
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exact = skipstep3 = False
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if matchfn == match.exact: # match.exact
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exact = True
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dirignore = util.always # skip step 2
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elif match.files() and not match.anypats(): # match.match, no patterns
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skipstep3 = True
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if not exact and self._checkcase:
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# note that even though we could receive directory entries, we're only
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# interested in checking if a file with the same name exists. So only
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# normalize files if possible.
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normalize = self._normalizefile
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skipstep3 = False
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else:
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normalize = None
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# step 1: find all explicit files
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results, work, dirsnotfound = self._walkexplicit(match, subrepos)
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skipstep3 = skipstep3 and not (work or dirsnotfound)
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work = [d for d in work if not dirignore(d[0])]
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if not work and (exact or skipstep3):
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for s in subrepos:
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del results[s]
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del results['.hg']
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return results
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# step 2: query Watchman
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try:
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# Use the user-configured timeout for the query.
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# Add a little slack over the top of the user query to allow for
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# overheads while transferring the data
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self._watchmanclient.settimeout(state.timeout + 0.1)
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result = self._watchmanclient.command('query', {
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'fields': ['mode', 'mtime', 'size', 'exists', 'name'],
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'since': clock,
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'expression': [
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'not', [
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'anyof', ['dirname', '.hg'],
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['name', '.hg', 'wholename']
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]
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],
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'sync_timeout': int(state.timeout * 1000),
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'empty_on_fresh_instance': state.walk_on_invalidate,
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})
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except Exception as ex:
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_handleunavailable(self._ui, state, ex)
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self._watchmanclient.clearconnection()
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return bail()
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else:
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# We need to propagate the last observed clock up so that we
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# can use it for our next query
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state.setlastclock(result['clock'])
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if result['is_fresh_instance']:
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if state.walk_on_invalidate:
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state.invalidate()
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return bail()
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fresh_instance = True
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# Ignore any prior noteable files from the state info
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notefiles = []
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# for file paths which require normalization and we encounter a case
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# collision, we store our own foldmap
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if normalize:
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foldmap = dict((normcase(k), k) for k in results)
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switch_slashes = os.sep == '\\'
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# The order of the results is, strictly speaking, undefined.
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# For case changes on a case insensitive filesystem we may receive
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# two entries, one with exists=True and another with exists=False.
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# The exists=True entries in the same response should be interpreted
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# as being happens-after the exists=False entries due to the way that
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# Watchman tracks files. We use this property to reconcile deletes
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# for name case changes.
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for entry in result['files']:
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fname = entry['name']
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if switch_slashes:
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fname = fname.replace('\\', '/')
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if normalize:
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normed = normcase(fname)
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fname = normalize(fname, True, True)
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foldmap[normed] = fname
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fmode = entry['mode']
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fexists = entry['exists']
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kind = getkind(fmode)
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if not fexists:
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# if marked as deleted and we don't already have a change
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# record, mark it as deleted. If we already have an entry
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# for fname then it was either part of walkexplicit or was
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# an earlier result that was a case change
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if fname not in results and fname in dmap and (
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matchalways or matchfn(fname)):
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results[fname] = None
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elif kind == dirkind:
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if fname in dmap and (matchalways or matchfn(fname)):
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results[fname] = None
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elif kind == regkind or kind == lnkkind:
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if fname in dmap:
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if matchalways or matchfn(fname):
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results[fname] = entry
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elif (matchalways or matchfn(fname)) and not ignore(fname):
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results[fname] = entry
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elif fname in dmap and (matchalways or matchfn(fname)):
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results[fname] = None
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# step 3: query notable files we don't already know about
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# XXX try not to iterate over the entire dmap
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if normalize:
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# any notable files that have changed case will already be handled
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# above, so just check membership in the foldmap
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notefiles = set((normalize(f, True, True) for f in notefiles
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if normcase(f) not in foldmap))
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visit = set((f for f in notefiles if (f not in results and matchfn(f)
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and (f in dmap or not ignore(f)))))
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if nonnormalset is not None and not fresh_instance:
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if matchalways:
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visit.update(f for f in nonnormalset if f not in results)
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visit.update(f for f in copymap if f not in results)
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else:
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visit.update(f for f in nonnormalset
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if f not in results and matchfn(f))
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visit.update(f for f in copymap
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if f not in results and matchfn(f))
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else:
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if matchalways:
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visit.update(f for f, st in dmap.iteritems()
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if (f not in results and
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(st[2] < 0 or st[0] != 'n' or fresh_instance)))
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visit.update(f for f in copymap if f not in results)
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else:
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visit.update(f for f, st in dmap.iteritems()
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if (f not in results and
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(st[2] < 0 or st[0] != 'n' or fresh_instance)
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and matchfn(f)))
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visit.update(f for f in copymap
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if f not in results and matchfn(f))
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audit = pathutil.pathauditor(self._root).check
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auditpass = [f for f in visit if audit(f)]
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auditpass.sort()
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auditfail = visit.difference(auditpass)
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for f in auditfail:
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results[f] = None
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nf = iter(auditpass).next
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for st in util.statfiles([join(f) for f in auditpass]):
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f = nf()
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if st or f in dmap:
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results[f] = st
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for s in subrepos:
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del results[s]
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del results['.hg']
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return results
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def overridestatus(
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orig, self, node1='.', node2=None, match=None, ignored=False,
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clean=False, unknown=False, listsubrepos=False):
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listignored = ignored
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listclean = clean
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listunknown = unknown
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def _cmpsets(l1, l2):
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try:
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if 'FSMONITOR_LOG_FILE' in os.environ:
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fn = os.environ['FSMONITOR_LOG_FILE']
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f = open(fn, 'wb')
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else:
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fn = 'fsmonitorfail.log'
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f = self.opener(fn, 'wb')
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except (IOError, OSError):
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self.ui.warn(_('warning: unable to write to %s\n') % fn)
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return
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try:
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for i, (s1, s2) in enumerate(zip(l1, l2)):
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if set(s1) != set(s2):
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f.write('sets at position %d are unequal\n' % i)
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f.write('watchman returned: %s\n' % s1)
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f.write('stat returned: %s\n' % s2)
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finally:
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f.close()
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if isinstance(node1, context.changectx):
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ctx1 = node1
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else:
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ctx1 = self[node1]
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if isinstance(node2, context.changectx):
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ctx2 = node2
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else:
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ctx2 = self[node2]
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working = ctx2.rev() is None
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parentworking = working and ctx1 == self['.']
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match = match or matchmod.always(self.root, self.getcwd())
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# Maybe we can use this opportunity to update Watchman's state.
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# Mercurial uses workingcommitctx and/or memctx to represent the part of
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# the workingctx that is to be committed. So don't update the state in
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# that case.
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# HG_PENDING is set in the environment when the dirstate is being updated
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# in the middle of a transaction; we must not update our state in that
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# case, or we risk forgetting about changes in the working copy.
|
|
|
updatestate = (parentworking and match.always() and
|
|
|
not isinstance(ctx2, (context.workingcommitctx,
|
|
|
context.memctx)) and
|
|
|
'HG_PENDING' not in os.environ)
|
|
|
|
|
|
try:
|
|
|
if self._fsmonitorstate.walk_on_invalidate:
|
|
|
# Use a short timeout to query the current clock. If that
|
|
|
# takes too long then we assume that the service will be slow
|
|
|
# to answer our query.
|
|
|
# walk_on_invalidate indicates that we prefer to walk the
|
|
|
# tree ourselves because we can ignore portions that Watchman
|
|
|
# cannot and we tend to be faster in the warmer buffer cache
|
|
|
# cases.
|
|
|
self._watchmanclient.settimeout(0.1)
|
|
|
else:
|
|
|
# Give Watchman more time to potentially complete its walk
|
|
|
# and return the initial clock. In this mode we assume that
|
|
|
# the filesystem will be slower than parsing a potentially
|
|
|
# very large Watchman result set.
|
|
|
self._watchmanclient.settimeout(
|
|
|
self._fsmonitorstate.timeout + 0.1)
|
|
|
startclock = self._watchmanclient.getcurrentclock()
|
|
|
except Exception as ex:
|
|
|
self._watchmanclient.clearconnection()
|
|
|
_handleunavailable(self.ui, self._fsmonitorstate, ex)
|
|
|
# boo, Watchman failed. bail
|
|
|
return orig(node1, node2, match, listignored, listclean,
|
|
|
listunknown, listsubrepos)
|
|
|
|
|
|
if updatestate:
|
|
|
# We need info about unknown files. This may make things slower the
|
|
|
# first time, but whatever.
|
|
|
stateunknown = True
|
|
|
else:
|
|
|
stateunknown = listunknown
|
|
|
|
|
|
r = orig(node1, node2, match, listignored, listclean, stateunknown,
|
|
|
listsubrepos)
|
|
|
modified, added, removed, deleted, unknown, ignored, clean = r
|
|
|
|
|
|
if updatestate:
|
|
|
notefiles = modified + added + removed + deleted + unknown
|
|
|
self._fsmonitorstate.set(
|
|
|
self._fsmonitorstate.getlastclock() or startclock,
|
|
|
_hashignore(self.dirstate._ignore),
|
|
|
notefiles)
|
|
|
|
|
|
if not listunknown:
|
|
|
unknown = []
|
|
|
|
|
|
# don't do paranoid checks if we're not going to query Watchman anyway
|
|
|
full = listclean or match.traversedir is not None
|
|
|
if self._fsmonitorstate.mode == 'paranoid' and not full:
|
|
|
# run status again and fall back to the old walk this time
|
|
|
self.dirstate._fsmonitordisable = True
|
|
|
|
|
|
# shut the UI up
|
|
|
quiet = self.ui.quiet
|
|
|
self.ui.quiet = True
|
|
|
fout, ferr = self.ui.fout, self.ui.ferr
|
|
|
self.ui.fout = self.ui.ferr = open(os.devnull, 'wb')
|
|
|
|
|
|
try:
|
|
|
rv2 = orig(
|
|
|
node1, node2, match, listignored, listclean, listunknown,
|
|
|
listsubrepos)
|
|
|
finally:
|
|
|
self.dirstate._fsmonitordisable = False
|
|
|
self.ui.quiet = quiet
|
|
|
self.ui.fout, self.ui.ferr = fout, ferr
|
|
|
|
|
|
# clean isn't tested since it's set to True above
|
|
|
_cmpsets([modified, added, removed, deleted, unknown, ignored, clean],
|
|
|
rv2)
|
|
|
modified, added, removed, deleted, unknown, ignored, clean = rv2
|
|
|
|
|
|
return scmutil.status(
|
|
|
modified, added, removed, deleted, unknown, ignored, clean)
|
|
|
|
|
|
def makedirstate(cls):
|
|
|
class fsmonitordirstate(cls):
|
|
|
def _fsmonitorinit(self, fsmonitorstate, watchmanclient):
|
|
|
# _fsmonitordisable is used in paranoid mode
|
|
|
self._fsmonitordisable = False
|
|
|
self._fsmonitorstate = fsmonitorstate
|
|
|
self._watchmanclient = watchmanclient
|
|
|
|
|
|
def walk(self, *args, **kwargs):
|
|
|
orig = super(fsmonitordirstate, self).walk
|
|
|
if self._fsmonitordisable:
|
|
|
return orig(*args, **kwargs)
|
|
|
return overridewalk(orig, self, *args, **kwargs)
|
|
|
|
|
|
def rebuild(self, *args, **kwargs):
|
|
|
self._fsmonitorstate.invalidate()
|
|
|
return super(fsmonitordirstate, self).rebuild(*args, **kwargs)
|
|
|
|
|
|
def invalidate(self, *args, **kwargs):
|
|
|
self._fsmonitorstate.invalidate()
|
|
|
return super(fsmonitordirstate, self).invalidate(*args, **kwargs)
|
|
|
|
|
|
return fsmonitordirstate
|
|
|
|
|
|
def wrapdirstate(orig, self):
|
|
|
ds = orig(self)
|
|
|
# only override the dirstate when Watchman is available for the repo
|
|
|
if util.safehasattr(self, '_fsmonitorstate'):
|
|
|
ds.__class__ = makedirstate(ds.__class__)
|
|
|
ds._fsmonitorinit(self._fsmonitorstate, self._watchmanclient)
|
|
|
return ds
|
|
|
|
|
|
def extsetup(ui):
|
|
|
wrapfilecache(localrepo.localrepository, 'dirstate', wrapdirstate)
|
|
|
if sys.platform == 'darwin':
|
|
|
# An assist for avoiding the dangling-symlink fsevents bug
|
|
|
extensions.wrapfunction(os, 'symlink', wrapsymlink)
|
|
|
|
|
|
def wrapsymlink(orig, source, link_name):
|
|
|
''' if we create a dangling symlink, also touch the parent dir
|
|
|
to encourage fsevents notifications to work more correctly '''
|
|
|
try:
|
|
|
return orig(source, link_name)
|
|
|
finally:
|
|
|
try:
|
|
|
os.utime(os.path.dirname(link_name), None)
|
|
|
except OSError:
|
|
|
pass
|
|
|
|
|
|
def reposetup(ui, repo):
|
|
|
# We don't work with largefiles or inotify
|
|
|
exts = extensions.enabled()
|
|
|
for ext in _blacklist:
|
|
|
if ext in exts:
|
|
|
ui.warn(_('The fsmonitor extension is incompatible with the %s '
|
|
|
'extension and has been disabled.\n') % ext)
|
|
|
return
|
|
|
|
|
|
if util.safehasattr(repo, 'dirstate'):
|
|
|
# We don't work with subrepos either. Note that we can get passed in
|
|
|
# e.g. a statichttprepo, which throws on trying to access the substate.
|
|
|
# XXX This sucks.
|
|
|
try:
|
|
|
# if repo[None].substate can cause a dirstate parse, which is too
|
|
|
# slow. Instead, look for a file called hgsubstate,
|
|
|
if repo.wvfs.exists('.hgsubstate') or repo.wvfs.exists('.hgsub'):
|
|
|
return
|
|
|
except AttributeError:
|
|
|
return
|
|
|
|
|
|
fsmonitorstate = state.state(repo)
|
|
|
if fsmonitorstate.mode == 'off':
|
|
|
return
|
|
|
|
|
|
try:
|
|
|
client = watchmanclient.client(repo)
|
|
|
except Exception as ex:
|
|
|
_handleunavailable(ui, fsmonitorstate, ex)
|
|
|
return
|
|
|
|
|
|
repo._fsmonitorstate = fsmonitorstate
|
|
|
repo._watchmanclient = client
|
|
|
|
|
|
# at this point since fsmonitorstate wasn't present, repo.dirstate is
|
|
|
# not a fsmonitordirstate
|
|
|
repo.dirstate.__class__ = makedirstate(repo.dirstate.__class__)
|
|
|
# nuke the dirstate so that _fsmonitorinit and subsequent configuration
|
|
|
# changes take effect on it
|
|
|
del repo._filecache['dirstate']
|
|
|
delattr(repo.unfiltered(), 'dirstate')
|
|
|
|
|
|
class fsmonitorrepo(repo.__class__):
|
|
|
def status(self, *args, **kwargs):
|
|
|
orig = super(fsmonitorrepo, self).status
|
|
|
return overridestatus(orig, self, *args, **kwargs)
|
|
|
|
|
|
repo.__class__ = fsmonitorrepo
|
|
|
|
|
|
def wrapfilecache(cls, propname, wrapper):
|
|
|
"""Wraps a filecache property. These can't be wrapped using the normal
|
|
|
wrapfunction. This should eventually go into upstream Mercurial.
|
|
|
"""
|
|
|
assert callable(wrapper)
|
|
|
for currcls in cls.__mro__:
|
|
|
if propname in currcls.__dict__:
|
|
|
origfn = currcls.__dict__[propname].func
|
|
|
assert callable(origfn)
|
|
|
def wrap(*args, **kwargs):
|
|
|
return wrapper(origfn, *args, **kwargs)
|
|
|
currcls.__dict__[propname].func = wrap
|
|
|
break
|
|
|
|
|
|
if currcls is object:
|
|
|
raise AttributeError(
|
|
|
_("type '%s' has no property '%s'") % (cls, propname))
|
|
|
|
