hgext/fsmonitor/state.py
author Martin von Zweigbergk <martinvonz@google.com>
Wed, 02 Dec 2020 15:39:01 -0800
changeset 46010 61c1f29e7f4f
parent 43392 8a9e53b974ee
child 48875 6000f5b25c9b
permissions -rw-r--r--
rebase: clear merge state when aborting in-memory merge on dirty working copy Differential Revision: https://phab.mercurial-scm.org/D9509
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# state.py - fsmonitor persistent state
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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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from __future__ import absolute_import
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import errno
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import os
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import socket
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import struct
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from mercurial.i18n import _
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from mercurial import (
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    encoding,
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    pathutil,
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    util,
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)
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_version = 4
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_versionformat = b">I"
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class state(object):
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    def __init__(self, repo):
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        self._vfs = repo.vfs
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        self._ui = repo.ui
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        self._rootdir = pathutil.normasprefix(repo.root)
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        self._lastclock = None
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        self._identity = util.filestat(None)
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        self.mode = self._ui.config(b'fsmonitor', b'mode')
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        self.walk_on_invalidate = self._ui.configbool(
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            b'fsmonitor', b'walk_on_invalidate'
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        )
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        self.timeout = float(self._ui.config(b'fsmonitor', b'timeout'))
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    def get(self):
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        try:
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            file = self._vfs(b'fsmonitor.state', b'rb')
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        except IOError as inst:
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            self._identity = util.filestat(None)
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            if inst.errno != errno.ENOENT:
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                raise
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            return None, None, None
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        self._identity = util.filestat.fromfp(file)
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        versionbytes = file.read(4)
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        if len(versionbytes) < 4:
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            self._ui.log(
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                b'fsmonitor',
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                b'fsmonitor: state file only has %d bytes, '
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                b'nuking state\n' % len(versionbytes),
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            )
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            self.invalidate()
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            return None, None, None
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        try:
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            diskversion = struct.unpack(_versionformat, versionbytes)[0]
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            if diskversion != _version:
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                # different version, nuke state and start over
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                self._ui.log(
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                    b'fsmonitor',
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                    b'fsmonitor: version switch from %d to '
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                    b'%d, nuking state\n' % (diskversion, _version),
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                )
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                self.invalidate()
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                return None, None, None
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            state = file.read().split(b'\0')
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            # state = hostname\0clock\0ignorehash\0 + list of files, each
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            # followed by a \0
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            if len(state) < 3:
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                self._ui.log(
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                    b'fsmonitor',
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                    b'fsmonitor: state file truncated (expected '
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                    b'3 chunks, found %d), nuking state\n',
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                    len(state),
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                )
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                self.invalidate()
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                return None, None, None
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            diskhostname = state[0]
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            hostname = encoding.strtolocal(socket.gethostname())
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            if diskhostname != hostname:
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                # file got moved to a different host
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                self._ui.log(
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                    b'fsmonitor',
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                    b'fsmonitor: stored hostname "%s" '
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                    b'different from current "%s", nuking state\n'
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                    % (diskhostname, hostname),
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                )
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                self.invalidate()
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                return None, None, None
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            clock = state[1]
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            ignorehash = state[2]
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            # discard the value after the last \0
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            notefiles = state[3:-1]
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        finally:
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            file.close()
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        return clock, ignorehash, notefiles
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    def set(self, clock, ignorehash, notefiles):
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        if clock is None:
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            self.invalidate()
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            return
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        # Read the identity from the file on disk rather than from the open file
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        # pointer below, because the latter is actually a brand new file.
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        identity = util.filestat.frompath(self._vfs.join(b'fsmonitor.state'))
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        if identity != self._identity:
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            self._ui.debug(
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                b'skip updating fsmonitor.state: identity mismatch\n'
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            )
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            return
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        try:
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            file = self._vfs(
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                b'fsmonitor.state', b'wb', atomictemp=True, checkambig=True
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            )
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        except (IOError, OSError):
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            self._ui.warn(_(b"warning: unable to write out fsmonitor state\n"))
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            return
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        with file:
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            file.write(struct.pack(_versionformat, _version))
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            file.write(encoding.strtolocal(socket.gethostname()) + b'\0')
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            file.write(clock + b'\0')
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            file.write(ignorehash + b'\0')
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            if notefiles:
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                file.write(b'\0'.join(notefiles))
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
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                file.write(b'\0')
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parents:
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   137
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    def invalidate(self):
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        try:
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            os.unlink(os.path.join(self._rootdir, b'.hg', b'fsmonitor.state'))
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        except OSError as inst:
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            if inst.errno != errno.ENOENT:
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                raise
32816
1b25c648d5b7 fsmonitor: don't write out state if identity has changed (issue5581)
Siddharth Agarwal <sid0@fb.com>
parents: 31215
diff changeset
   144
        self._identity = util.filestat(None)
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parents:
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   145
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   146
    def setlastclock(self, clock):
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   147
        self._lastclock = clock
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parents:
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   148
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parents:
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    def getlastclock(self):
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        return self._lastclock