mirror of
https://github.com/facebook/sapling.git
synced 2024-10-11 01:07:15 +03:00
fad9d569cb
Summary: `tr.writepending()` removes callbacks saying "temp files are already written". However, `tr.writepending()` might be called multiple times and the content being written can be changed. For example, `test-hook.t` has a test case that uses both `prechangegroup` and `pretxnchangegroup` external process hooks. The `prechangegroup` hook runs before the changelog gets changed, and the `pretxnchangegroup` runs after the changelog gets changed. Without this diff, the latter will not see the changelog change after migrating to Rust (which buffers pending commits in memory). The revlog changelog "addpending" is kept the original behavior - only call once for avoiding potential performance regression. Reviewed By: DurhamG Differential Revision: D22657199 fbshipit-source-id: 8f96a0beaeebd45e73de3973e3ee8dd1426295fb
725 lines
25 KiB
Python
725 lines
25 KiB
Python
# Portions Copyright (c) Facebook, Inc. and its affiliates.
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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.
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# transaction.py - simple journaling scheme for mercurial
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#
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# This transaction scheme is intended to gracefully handle program
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# errors and interruptions. More serious failures like system crashes
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# can be recovered with an fsck-like tool. As the whole repository is
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# effectively log-structured, this should amount to simply truncating
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# anything that isn't referenced in the changelog.
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#
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# Copyright 2005, 2006 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 errno
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import functools
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from . import encoding, error, pycompat, util
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from .i18n import _
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from .pycompat import decodeutf8, encodeutf8
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version = 2
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# These are the file generators that should only be executed after the
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# finalizers are done, since they rely on the output of the finalizers (like
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# the changelog having been written).
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postfinalizegenerators = {"bookmarks", "dirstate"}
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gengroupall = "all"
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gengroupprefinalize = "prefinalize"
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gengrouppostfinalize = "postfinalize"
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def active(func):
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def _active(self, *args, **kwds):
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if self.count == 0:
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raise error.Abort(
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_("cannot use transaction when it is already committed/aborted")
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)
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return func(self, *args, **kwds)
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return _active
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def _playback(
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journal,
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report,
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opener,
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vfsmap,
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entries,
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backupentries,
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unlink=True,
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checkambigfiles=None,
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):
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for f, o, _ignore in entries:
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if o or not unlink:
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checkambig = checkambigfiles and (f, "") in checkambigfiles
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try:
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util.truncatefile(f, opener, o, checkambig=checkambig)
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except IOError:
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report(_("failed to truncate %s\n") % f)
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raise
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else:
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try:
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opener.unlink(f)
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except (IOError, OSError) as inst:
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if inst.errno != errno.ENOENT:
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raise
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backupfiles = []
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for l, f, b, c in backupentries:
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if l not in vfsmap and c:
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report("couldn't handle %s: unknown cache location %s\n" % (b, l))
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vfs = vfsmap[l]
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try:
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if f and b:
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filepath = vfs.join(f)
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backuppath = vfs.join(b)
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checkambig = checkambigfiles and (f, l) in checkambigfiles
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try:
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util.copyfile(backuppath, filepath, checkambig=checkambig)
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backupfiles.append(b)
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except IOError:
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report(_("failed to recover %s\n") % f)
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else:
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target = f or b
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try:
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vfs.unlink(target)
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except (IOError, OSError) as inst:
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if inst.errno != errno.ENOENT:
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raise
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except (IOError, OSError, error.Abort):
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if not c:
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raise
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backuppath = "%s.backupfiles" % journal
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if opener.exists(backuppath):
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opener.unlink(backuppath)
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opener.unlink(journal)
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try:
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for f in backupfiles:
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if opener.exists(f):
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opener.unlink(f)
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except (IOError, OSError, error.Abort):
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# only pure backup file remains, it is sage to ignore any error
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pass
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class transaction(util.transactional):
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def __init__(
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self,
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report,
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opener,
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vfsmap,
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journalname,
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undoname=None,
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after=None,
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createmode=None,
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validator=None,
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releasefn=None,
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checkambigfiles=None,
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uiconfig=None,
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desc=None,
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):
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"""Begin a new transaction
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Begins a new transaction that allows rolling back writes in the event of
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an exception.
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* `after`: called after the transaction has been committed
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* `createmode`: the mode of the journal file that will be created
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* `releasefn`: called after releasing (with transaction and result)
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`checkambigfiles` is a set of (path, vfs-location) tuples,
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which determine whether file stat ambiguity should be avoided
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for corresponded files.
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"""
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self.count = 1
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self.usages = 1
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self.report = report
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self.desc = desc
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# a vfs to the store content
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self.opener = opener
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# a map to access file in various {location -> vfs}
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vfsmap = vfsmap.copy()
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vfsmap[""] = opener # set default value
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self._vfsmap = vfsmap
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self.after = after
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self.entries = []
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self.map = {}
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self.journal = journalname
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self.undoname = undoname
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self._queue = []
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# A callback to validate transaction content before closing it.
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# should raise exception is anything is wrong.
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# target user is repository hooks.
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if validator is None:
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validator = lambda tr: None
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self.validator = validator
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# A callback to do something just after releasing transaction.
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if releasefn is None:
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releasefn = lambda tr, success: None
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self.releasefn = releasefn
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self.checkambigfiles = set()
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if checkambigfiles:
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self.checkambigfiles.update(checkambigfiles)
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self.uiconfig = uiconfig
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# A dict dedicated to precisely tracking the changes introduced in the
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# transaction.
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self.changes = {}
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# a dict of arguments to be passed to hooks
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self.hookargs = {}
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self.file = opener.open(self.journal, "wb")
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# a list of ('location', 'path', 'backuppath', cache) entries.
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# - if 'backuppath' is empty, no file existed at backup time
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# - if 'path' is empty, this is a temporary transaction file
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# - if 'location' is not empty, the path is outside main opener reach.
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# use 'location' value as a key in a vfsmap to find the right 'vfs'
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# (cache is currently unused)
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self._backupentries = []
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self._backupmap = {}
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self._backupjournal = "%s.backupfiles" % self.journal
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self._backupsfile = opener.open(self._backupjournal, "wb")
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self._backupsfile.write(b"%d\n" % version)
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if createmode is not None:
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opener.chmod(self.journal, createmode & 0o666)
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opener.chmod(self._backupjournal, createmode & 0o666)
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# hold file generations to be performed on commit
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self._filegenerators = {}
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# hold callback to write pending data for hooks
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self._pendingcallback = {}
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# True is any pending data have been written ever
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self._anypending = False
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# holds callback to call when writing the transaction
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self._finalizecallback = {}
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# hold callback for post transaction close
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self._postclosecallback = {}
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# holds callbacks to call during abort
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self._abortcallback = {}
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# Reload metalog state when entering transaction.
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metalog = opener.__dict__.pop("metalog", None)
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if metalog and metalog.isdirty():
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# |<- A ->|<----------- repo lock --------->|
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# |<- B ->|<- transaction ->|<- C ->|
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# ^^^^^^^
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raise error.ProgrammingError(
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"metalog should not be changed before transaction"
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)
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def __del__(self):
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if self.journal:
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self._abort()
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@active
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def startgroup(self):
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"""delay registration of file entry
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This is used by strip to delay vision of strip offset. The transaction
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sees either none or all of the strip actions to be done."""
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self._queue.append([])
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@active
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def endgroup(self):
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"""apply delayed registration of file entry.
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This is used by strip to delay vision of strip offset. The transaction
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sees either none or all of the strip actions to be done."""
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q = self._queue.pop()
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for f, o, data in q:
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self._addentry(f, o, data)
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@active
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def add(self, file, offset, data=None):
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"""record the state of an append-only file before update"""
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if file in self.map or file in self._backupmap:
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return
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if self._queue:
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self._queue[-1].append((file, offset, data))
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return
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self._addentry(file, offset, data)
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def _addentry(self, file, offset, data):
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"""add a append-only entry to memory and on-disk state"""
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if file in self.map or file in self._backupmap:
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return
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self.entries.append((file, offset, data))
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self.map[file] = len(self.entries) - 1
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# add enough data to the journal to do the truncate
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self.file.write(b"%s\0%d\n" % (encodeutf8(file), offset))
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self.file.flush()
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@active
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def addbackup(self, file, hardlink=True, location=""):
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"""Adds a backup of the file to the transaction
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Calling addbackup() creates a hardlink backup of the specified file
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that is used to recover the file in the event of the transaction
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aborting.
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* `file`: the file path, relative to .hg/store
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* `hardlink`: use a hardlink to quickly create the backup
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"""
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if self._queue:
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msg = 'cannot use transaction.addbackup inside "group"'
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raise error.ProgrammingError(msg)
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if file in self.map or file in self._backupmap:
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return
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vfs = self._vfsmap[location]
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dirname, filename = vfs.split(file)
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backupfilename = "%s.backup.%s" % (self.journal, filename)
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backupfile = vfs.reljoin(dirname, backupfilename)
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if vfs.exists(file):
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filepath = vfs.join(file)
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backuppath = vfs.join(backupfile)
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util.copyfile(filepath, backuppath, hardlink=hardlink)
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else:
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backupfile = ""
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self._addbackupentry((location, file, backupfile, False))
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def _addbackupentry(self, entry):
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"""register a new backup entry and write it to disk"""
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self._backupentries.append(entry)
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self._backupmap[entry[1]] = len(self._backupentries) - 1
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self._backupsfile.write(encodeutf8("%s\0%s\0%s\0%d\n" % entry))
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self._backupsfile.flush()
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@active
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def registertmp(self, tmpfile, location=""):
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"""register a temporary transaction file
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Such files will be deleted when the transaction exits (on both
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failure and success).
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"""
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self._addbackupentry((location, "", tmpfile, False))
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@active
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def addfilegenerator(self, genid, filenames, genfunc, order=0, location=""):
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"""add a function to generates some files at transaction commit
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The `genfunc` argument is a function capable of generating proper
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content of each entry in the `filename` tuple.
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At transaction close time, `genfunc` will be called with one file
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object argument per entries in `filenames`.
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The transaction itself is responsible for the backup, creation and
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final write of such file.
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The `genid` argument is used to ensure the same set of file is only
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generated once. Call to `addfilegenerator` for a `genid` already
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present will overwrite the old entry.
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The `order` argument may be used to control the order in which multiple
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generator will be executed.
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The `location` arguments may be used to indicate the files are located
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outside of the the standard directory for transaction. It should match
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one of the key of the `transaction.vfsmap` dictionary.
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"""
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# For now, we are unable to do proper backup and restore of custom vfs
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# but for bookmarks that are handled outside this mechanism.
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self._filegenerators[genid] = (order, filenames, genfunc, location)
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@active
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def removefilegenerator(self, genid):
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"""reverse of addfilegenerator, remove a file generator function"""
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if genid in self._filegenerators:
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del self._filegenerators[genid]
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def _generatefiles(self, suffix="", group=gengroupall):
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# write files registered for generation
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any = False
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for id, entry in sorted(pycompat.iteritems(self._filegenerators)):
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any = True
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order, filenames, genfunc, location = entry
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# for generation at closing, check if it's before or after finalize
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postfinalize = group == gengrouppostfinalize
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if group != gengroupall and (id in postfinalizegenerators) != postfinalize:
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continue
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vfs = self._vfsmap[location]
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files = []
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try:
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for name in filenames:
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name += suffix
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if suffix:
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self.registertmp(name, location=location)
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checkambig = False
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else:
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self.addbackup(name, location=location)
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checkambig = (name, location) in self.checkambigfiles
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files.append(vfs(name, "w", atomictemp=True, checkambig=checkambig))
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genfunc(*files)
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finally:
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for f in files:
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f.close()
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return any
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@active
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def find(self, file):
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if file in self.map:
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return self.entries[self.map[file]]
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if file in self._backupmap:
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return self._backupentries[self._backupmap[file]]
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return None
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@active
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def replace(self, file, offset, data=None):
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"""
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replace can only replace already committed entries
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that are not pending in the queue
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"""
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if file not in self.map:
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raise KeyError(file)
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index = self.map[file]
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self.entries[index] = (file, offset, data)
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self.file.write(b"%s\0%d\n" % (encodeutf8(file), offset))
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self.file.flush()
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@active
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def nest(self):
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self.count += 1
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self.usages += 1
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return self
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def release(self):
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if self.count > 0:
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self.usages -= 1
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# if the transaction scopes are left without being closed, fail
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if self.count > 0 and self.usages == 0:
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self._abort()
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def running(self):
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return self.count > 0
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def addpending(self, category, callback, onetime=False):
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"""add a callback to be called when the transaction is pending
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The transaction will be given as callback's first argument.
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Category is a unique identifier to allow overwriting an old callback
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with a newer callback.
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If onetime is set to True, the callback will only be called once.
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"""
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if onetime:
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callback = functools.partial(onetimewrapper, [False], callback)
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self._pendingcallback[category] = callback
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@active
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def writepending(self):
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"""write pending files
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This is used to allow hooks to view a transaction before commit"""
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for cat, callback in sorted(self._pendingcallback.items()):
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any = callback(self)
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self._anypending = self._anypending or any
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self._anypending |= self._generatefiles(suffix=".pending")
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return self._anypending
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@active
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def addfinalize(self, category, callback):
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"""add a callback to be called when the transaction is closed
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The transaction will be given as callback's first argument.
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Category is a unique identifier to allow overwriting old callbacks with
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newer callbacks.
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"""
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self._finalizecallback[category] = callback
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@active
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def addpostclose(self, category, callback):
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"""add or replace a callback to be called after the transaction closed
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The transaction will be given as callback's first argument.
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Category is a unique identifier to allow overwriting an old callback
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with a newer callback.
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"""
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self._postclosecallback[category] = callback
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@active
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def getpostclose(self, category):
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"""return a postclose callback added before, or None"""
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return self._postclosecallback.get(category, None)
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@active
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def addabort(self, category, callback):
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"""add a callback to be called when the transaction is aborted.
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The transaction will be given as the first argument to the callback.
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Category is a unique identifier to allow overwriting an old callback
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with a newer callback.
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"""
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self._abortcallback[category] = callback
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@active
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def close(self):
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"""commit the transaction"""
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if self.count == 1:
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self.validator(self) # will raise exception if needed
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self.validator = None # Help prevent cycles.
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self._generatefiles(group=gengroupprefinalize)
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categories = sorted(self._finalizecallback)
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for cat in categories:
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self._finalizecallback[cat](self)
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# Prevent double usage and help clear cycles.
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self._finalizecallback = None
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self._generatefiles(group=gengrouppostfinalize)
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self.count -= 1
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if self.count != 0:
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return
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self.file.close()
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self._backupsfile.close()
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# cleanup temporary files
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for l, f, b, c in self._backupentries:
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if l not in self._vfsmap and c:
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self.report("couldn't remove %s: unknown cache location %s\n" % (b, l))
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continue
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vfs = self._vfsmap[l]
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if not f and b and vfs.exists(b):
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try:
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vfs.unlink(b)
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except (IOError, OSError, error.Abort) as inst:
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if not c:
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raise
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# Abort may be raise by read only opener
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self.report("couldn't remove %s: %s\n" % (vfs.join(b), inst))
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self.entries = []
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self._writeundo()
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self._writemetalog()
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if self.after:
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self.after()
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self.after = None # Help prevent cycles.
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if self.opener.isfile(self._backupjournal):
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self.opener.unlink(self._backupjournal)
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if self.opener.isfile(self.journal):
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self.opener.unlink(self.journal)
|
|
for l, _f, b, c in self._backupentries:
|
|
if l not in self._vfsmap and c:
|
|
self.report(
|
|
"couldn't remove %s: unknown cache location" "%s\n" % (b, l)
|
|
)
|
|
continue
|
|
vfs = self._vfsmap[l]
|
|
if b and vfs.exists(b):
|
|
try:
|
|
vfs.unlink(b)
|
|
except (IOError, OSError, error.Abort) as inst:
|
|
if not c:
|
|
raise
|
|
# Abort may be raise by read only opener
|
|
self.report("couldn't remove %s: %s\n" % (vfs.join(b), inst))
|
|
|
|
self._backupentries = []
|
|
self.journal = None
|
|
|
|
self.releasefn(self, True) # notify success of closing transaction
|
|
self.releasefn = None # Help prevent cycles.
|
|
|
|
# run post close action
|
|
categories = sorted(self._postclosecallback)
|
|
for cat in categories:
|
|
self._postclosecallback[cat](self)
|
|
# Prevent double usage and help clear cycles.
|
|
self._postclosecallback = None
|
|
|
|
@active
|
|
def abort(self):
|
|
"""abort the transaction (generally called on error, or when the
|
|
transaction is not explicitly committed before going out of
|
|
scope)"""
|
|
self._abort()
|
|
|
|
def _writeundo(self):
|
|
"""write transaction data for possible future undo call"""
|
|
if self.undoname is None:
|
|
return
|
|
undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, "wb")
|
|
undobackupfile.write(encodeutf8("%d\n" % version))
|
|
for l, f, b, c in self._backupentries:
|
|
if not f: # temporary file
|
|
continue
|
|
if not b:
|
|
u = ""
|
|
else:
|
|
if l not in self._vfsmap and c:
|
|
self.report(
|
|
"couldn't remove %s: unknown cache location" "%s\n" % (b, l)
|
|
)
|
|
continue
|
|
vfs = self._vfsmap[l]
|
|
base, name = vfs.split(b)
|
|
assert name.startswith(self.journal), name
|
|
uname = name.replace(self.journal, self.undoname, 1)
|
|
u = vfs.reljoin(base, uname)
|
|
util.copyfile(vfs.join(b), vfs.join(u), hardlink=True)
|
|
undobackupfile.write(encodeutf8("%s\0%s\0%s\0%d\n" % (l, f, u, c)))
|
|
undobackupfile.close()
|
|
|
|
def _writemetalog(self):
|
|
"""write data managed by svfs.metalog"""
|
|
# Write metalog.
|
|
svfs = self._vfsmap[""]
|
|
metalog = getattr(svfs, "metalog", None)
|
|
if metalog:
|
|
# write down configs used by the repo for debugging purpose
|
|
if self.uiconfig and self.uiconfig.configbool("metalog", "track-config"):
|
|
metalog.set(
|
|
"config", pycompat.encodeutf8(self.uiconfig.configtostring())
|
|
)
|
|
|
|
metalog.commit(
|
|
encoding.unifromlocal(
|
|
" ".join(map(util.shellquote, pycompat.sysargv[1:]))
|
|
),
|
|
int(util.timer()),
|
|
)
|
|
# Discard metalog state when exiting transaction.
|
|
del svfs.__dict__["metalog"]
|
|
|
|
def _abort(self):
|
|
self.count = 0
|
|
self.usages = 0
|
|
self.file.close()
|
|
self._backupsfile.close()
|
|
|
|
# Discard metalog state when exiting transaction.
|
|
svfs = self._vfsmap[""]
|
|
svfs.__dict__.pop("metalog", None)
|
|
|
|
try:
|
|
if not self.entries and not self._backupentries:
|
|
if self._backupjournal:
|
|
self.opener.unlink(self._backupjournal)
|
|
if self.journal:
|
|
self.opener.unlink(self.journal)
|
|
return
|
|
|
|
self.report(_("transaction abort!\n"))
|
|
|
|
try:
|
|
for cat in sorted(self._abortcallback):
|
|
self._abortcallback[cat](self)
|
|
# Prevent double usage and help clear cycles.
|
|
self._abortcallback = None
|
|
_playback(
|
|
self.journal,
|
|
self.report,
|
|
self.opener,
|
|
self._vfsmap,
|
|
self.entries,
|
|
self._backupentries,
|
|
False,
|
|
checkambigfiles=self.checkambigfiles,
|
|
)
|
|
self.report(_("rollback completed\n"))
|
|
except BaseException:
|
|
self.report(_("rollback failed - please run hg recover\n"))
|
|
finally:
|
|
self.journal = None
|
|
self.releasefn(self, False) # notify failure of transaction
|
|
self.releasefn = None # Help prevent cycles.
|
|
|
|
|
|
def rollback(opener, vfsmap, file, report, checkambigfiles=None):
|
|
"""Rolls back the transaction contained in the given file
|
|
|
|
Reads the entries in the specified file, and the corresponding
|
|
'*.backupfiles' file, to recover from an incomplete transaction.
|
|
|
|
* `file`: a file containing a list of entries, specifying where
|
|
to truncate each file. The file should contain a list of
|
|
file\0offset pairs, delimited by newlines. The corresponding
|
|
'*.backupfiles' file should contain a list of file\0backupfile
|
|
pairs, delimited by \0.
|
|
|
|
`checkambigfiles` is a set of (path, vfs-location) tuples,
|
|
which determine whether file stat ambiguity should be avoided at
|
|
restoring corresponded files.
|
|
"""
|
|
entries = []
|
|
backupentries = []
|
|
|
|
fp = opener.open(file, "rb")
|
|
lines = fp.readlines()
|
|
fp.close()
|
|
for l in lines:
|
|
l = decodeutf8(l)
|
|
try:
|
|
f, o = l.split("\0")
|
|
entries.append((f, int(o), None))
|
|
except ValueError:
|
|
report(_("couldn't read journal entry %r!\n") % l)
|
|
|
|
backupjournal = "%s.backupfiles" % file
|
|
if opener.exists(backupjournal):
|
|
fp = opener.open(backupjournal, "rb")
|
|
lines = fp.readlines()
|
|
if lines:
|
|
ver = decodeutf8(lines[0][:-1])
|
|
if ver == str(version):
|
|
for line in lines[1:]:
|
|
if line:
|
|
# Shave off the trailing newline
|
|
line = line[:-1]
|
|
line = decodeutf8(line)
|
|
try:
|
|
l, f, b, c = line.split("\0")
|
|
except ValueError:
|
|
raise AssertionError(
|
|
"Invalid line format in {}: {}".format(
|
|
backupjournal, line
|
|
)
|
|
)
|
|
backupentries.append((l, f, b, bool(c)))
|
|
else:
|
|
report(
|
|
_("journal was created by a different version of " "Mercurial\n")
|
|
)
|
|
|
|
_playback(
|
|
file,
|
|
report,
|
|
opener,
|
|
vfsmap,
|
|
entries,
|
|
backupentries,
|
|
checkambigfiles=checkambigfiles,
|
|
)
|
|
|
|
|
|
def onetimewrapper(called, orig, *args, **kwargs):
|
|
"""Wrapper to call orig function only once.
|
|
|
|
This function is meant to be bound with called=[False], orig=func using
|
|
functools.partial.
|
|
"""
|
|
if not called[0]:
|
|
called[0] = True
|
|
return orig(*args, **kwargs)
|