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manifest: avoid corruption by dropping removed files with pure (issue5801)...
manifest: avoid corruption by dropping removed files with pure (issue5801) Previously, removed files would simply be marked by overwriting the first byte with NUL and dropping their entry in `self.position`. But no effort was made to ignore them when compacting the dictionary into text form. This allowed them to slip into the manifest revision, since the code seems to be trying to minimize the string operations by copying as large a chunk as possible. As part of this, compact() walks the existing text based on entries in the `positions` list, and consumed everything up to the next position entry. This typically resulted in a ValueError complaining about unsorted manifest entries. Sometimes it seems that files do get dropped in large repos- it seems to correspond to there being a new entry that would take the same slot. A much more trivial problem is that if the only changes were removals, `_compact()` didn't even run because `__delitem__` doesn't add anything to `self.extradata`. Now there's an explicit variable to flag this, both to allow `_compact()` to run, and to avoid searching the manifest in cases where there are no removals. In practice, this behavior was mostly obscured by the check in fastdelta() which takes a different path that explicitly drops removed files if there are fewer than 1000 changes. However, timeless has a repo where after rebasing tens of commits, a totally different path[1] is taken that bypasses the change count check and hits this problem. [1] https://www.mercurial-scm.org/repo/hg/file/2338bdea4474/mercurial/manifest.py#l1511

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record.py
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# record.py
#
# Copyright 2007 Bryan O'Sullivan <bos@serpentine.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''commands to interactively select changes for commit/qrefresh (DEPRECATED)
The feature provided by this extension has been moved into core Mercurial as
:hg:`commit --interactive`.'''
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
cmdutil,
commands,
error,
extensions,
registrar,
)
cmdtable = {}
command = registrar.command(cmdtable)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'
@command("record",
# same options as commit + white space diff options
[c for c in commands.table['commit|ci'][1][:]
if c[1] != "interactive"] + cmdutil.diffwsopts,
_('hg record [OPTION]... [FILE]...'),
helpcategory=command.CATEGORY_COMMITTING)
def record(ui, repo, *pats, **opts):
'''interactively select changes to commit
If a list of files is omitted, all changes reported by :hg:`status`
will be candidates for recording.
See :hg:`help dates` for a list of formats valid for -d/--date.
If using the text interface (see :hg:`help config`),
you will be prompted for whether to record changes to each
modified file, and for files with multiple changes, for each
change to use. For each query, the following responses are
possible::
y - record this change
n - skip this change
e - edit this change manually
s - skip remaining changes to this file
f - record remaining changes to this file
d - done, skip remaining changes and files
a - record all changes to all remaining files
q - quit, recording no changes
? - display help
This command is not available when committing a merge.'''
if not ui.interactive():
raise error.Abort(_('running non-interactively, use %s instead') %
'commit')
opts[r"interactive"] = True
overrides = {('experimental', 'crecord'): False}
with ui.configoverride(overrides, 'record'):
return commands.commit(ui, repo, *pats, **opts)
def qrefresh(origfn, ui, repo, *pats, **opts):
if not opts[r'interactive']:
return origfn(ui, repo, *pats, **opts)
mq = extensions.find('mq')
def committomq(ui, repo, *pats, **opts):
# At this point the working copy contains only changes that
# were accepted. All other changes were reverted.
# We can't pass *pats here since qrefresh will undo all other
# changed files in the patch that aren't in pats.
mq.refresh(ui, repo, **opts)
# backup all changed files
cmdutil.dorecord(ui, repo, committomq, None, True,
cmdutil.recordfilter, *pats, **opts)
# This command registration is replaced during uisetup().
@command('qrecord',
[],
_('hg qrecord [OPTION]... PATCH [FILE]...'),
helpcategory=command.CATEGORY_COMMITTING,
inferrepo=True)
def qrecord(ui, repo, patch, *pats, **opts):
'''interactively record a new patch
See :hg:`help qnew` & :hg:`help record` for more information and
usage.
'''
return _qrecord('qnew', ui, repo, patch, *pats, **opts)
def _qrecord(cmdsuggest, ui, repo, patch, *pats, **opts):
try:
mq = extensions.find('mq')
except KeyError:
raise error.Abort(_("'mq' extension not loaded"))
repo.mq.checkpatchname(patch)
def committomq(ui, repo, *pats, **opts):
opts[r'checkname'] = False
mq.new(ui, repo, patch, *pats, **opts)
overrides = {('experimental', 'crecord'): False}
with ui.configoverride(overrides, 'record'):
cmdutil.checkunfinished(repo)
cmdutil.dorecord(ui, repo, committomq, cmdsuggest, False,
cmdutil.recordfilter, *pats, **opts)
def qnew(origfn, ui, repo, patch, *args, **opts):
if opts[r'interactive']:
return _qrecord(None, ui, repo, patch, *args, **opts)
return origfn(ui, repo, patch, *args, **opts)
def uisetup(ui):
try:
mq = extensions.find('mq')
except KeyError:
return
cmdtable["qrecord"] = (
qrecord,
# same options as qnew, but copy them so we don't get
# -i/--interactive for qrecord and add white space diff options
mq.cmdtable['qnew'][1][:] + cmdutil.diffwsopts,
_('hg qrecord [OPTION]... PATCH [FILE]...'))
_wrapcmd('qnew', mq.cmdtable, qnew, _("interactively record a new patch"))
_wrapcmd('qrefresh', mq.cmdtable, qrefresh,
_("interactively select changes to refresh"))
def _wrapcmd(cmd, table, wrapfn, msg):
entry = extensions.wrapcommand(table, cmd, wrapfn)
entry[1].append(('i', 'interactive', None, msg))