chgserver: remove Python 2 file descriptor logic
Follows up 0bb28b7736bc "chgserver: remove Python 2 support code."
On Python 2, we had to close newfp prior to restoring the original file
description since "delete newfp" would otherwise close the file descriptor
shared with the long-lived fp:
in attachio():
newfp = os.fdopen(fp.fileno(), mode, bufsize)
in _restoreio():
newfp.close() # temporarily close newfp.fileno() (= fp.fileno())
os.dup2(fd, fp.fileno()) # reopen fp.fileno() with original fd
On the other hand, we shouldn't call newfp.close() on Python 3 since
any function calls are proxied to the underlying file object by
procutil.LineBufferedWrapper.
# Copyright (C) 2015 - Mike Edgar <adgar@google.com>
#
# This extension enables removal of file content at a given revision,
# rewriting the data/metadata of successive revisions to preserve revision log
# integrity.
"""erase file content at a given revision
The censor command instructs Mercurial to erase all content of a file at a given
revision *without updating the changeset hash.* This allows existing history to
remain valid while preventing future clones/pulls from receiving the erased
data.
Typical uses for censor are due to security or legal requirements, including::
* Passwords, private keys, cryptographic material
* Licensed data/code/libraries for which the license has expired
* Personally Identifiable Information or other private data
Censored nodes can interrupt mercurial's typical operation whenever the excised
data needs to be materialized. Some commands, like ``hg cat``/``hg revert``,
simply fail when asked to produce censored data. Others, like ``hg verify`` and
``hg update``, must be capable of tolerating censored data to continue to
function in a meaningful way. Such commands only tolerate censored file
revisions if they are allowed by the "censor.policy=ignore" config option.
A few informative commands such as ``hg grep`` will unconditionally
ignore censored data and merely report that it was encountered.
"""
from mercurial.i18n import _
from mercurial.node import short
from mercurial import (
error,
logcmdutil,
registrar,
scmutil,
)
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 = b'ships-with-hg-core'
@command(
b'censor',
[
(
b'r',
b'rev',
b'',
_(b'censor file from specified revision'),
_(b'REV'),
),
(b't', b'tombstone', b'', _(b'replacement tombstone data'), _(b'TEXT')),
],
_(b'-r REV [-t TEXT] [FILE]'),
helpcategory=command.CATEGORY_MAINTENANCE,
)
def censor(ui, repo, path, rev=b'', tombstone=b'', **opts):
with repo.wlock(), repo.lock():
return _docensor(ui, repo, path, rev, tombstone, **opts)
def _docensor(ui, repo, path, rev=b'', tombstone=b'', **opts):
if not path:
raise error.Abort(_(b'must specify file path to censor'))
if not rev:
raise error.Abort(_(b'must specify revision to censor'))
wctx = repo[None]
m = scmutil.match(wctx, (path,))
if m.anypats() or len(m.files()) != 1:
raise error.Abort(_(b'can only specify an explicit filename'))
path = m.files()[0]
flog = repo.file(path)
if not len(flog):
raise error.Abort(_(b'cannot censor file with no history'))
rev = logcmdutil.revsingle(repo, rev, rev).rev()
try:
ctx = repo[rev]
except KeyError:
raise error.Abort(_(b'invalid revision identifier %s') % rev)
try:
fctx = ctx.filectx(path)
except error.LookupError:
raise error.Abort(_(b'file does not exist at revision %s') % rev)
fnode = fctx.filenode()
heads = []
for headnode in repo.heads():
hc = repo[headnode]
if path in hc and hc.filenode(path) == fnode:
heads.append(hc)
if heads:
headlist = b', '.join([short(c.node()) for c in heads])
raise error.Abort(
_(b'cannot censor file in heads (%s)') % headlist,
hint=_(b'clean/delete and commit first'),
)
wp = wctx.parents()
if ctx.node() in [p.node() for p in wp]:
raise error.Abort(
_(b'cannot censor working directory'),
hint=_(b'clean/delete/update first'),
)
with repo.transaction(b'censor') as tr:
flog.censorrevision(tr, fnode, tombstone=tombstone)