dirstate: delay writing out to ensure timestamp of each entries explicitly
Even though "dirstate.write()" is invoked explicitly after "normal"
invocations, timestamp field of entries may be still "unset" in the
"dirstate" file itself , because "pack_dirstate" drops it when it is
equal to the timestamp of "dirstate" file itself.
This can avoid overlooking modification of files, which are updated at
same time in the second. But on the other hand, this may hide timing
critical problems.
For example, incorrect "normal"-ing (or lack of "normallookup"-ing on
the already "normal"-ed entry) is visible only when:
- the target file is modified in the working directory at T1, and
- "dirstate" file is written out at T2 (!= T1)
Otherwise, T1 is dropped by "pack_dirstate" in "dirstate.write()"
invocation, and "unset" is stored into "dirstate" file.
It often fails to reproduce problems from incorrect "normal"-ing by
Mercurial testset, because automated actions in the small repository
almost always causes that T1 and T2 are same.
This patch adds the debug feature to delay writing out to ensure
timestamp of each entries explicitly.
This feature is used to make timing critical "dirstate" problems
reproducable in subsequent patches.
# sshpeer.py - ssh repository proxy class for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import re
from i18n import _
import util, error, wireproto
class remotelock(object):
def __init__(self, repo):
self.repo = repo
def release(self):
self.repo.unlock()
self.repo = None
def __del__(self):
if self.repo:
self.release()
def _serverquote(s):
'''quote a string for the remote shell ... which we assume is sh'''
if re.match('[a-zA-Z0-9@%_+=:,./-]*$', s):
return s
return "'%s'" % s.replace("'", "'\\''")
class sshpeer(wireproto.wirepeer):
def __init__(self, ui, path, create=False):
self._url = path
self.ui = ui
self.pipeo = self.pipei = self.pipee = None
u = util.url(path, parsequery=False, parsefragment=False)
if u.scheme != 'ssh' or not u.host or u.path is None:
self._abort(error.RepoError(_("couldn't parse location %s") % path))
self.user = u.user
if u.passwd is not None:
self._abort(error.RepoError(_("password in URL not supported")))
self.host = u.host
self.port = u.port
self.path = u.path or "."
sshcmd = self.ui.config("ui", "ssh", "ssh")
remotecmd = self.ui.config("ui", "remotecmd", "hg")
args = util.sshargs(sshcmd, self.host, self.user, self.port)
if create:
cmd = '%s %s %s' % (sshcmd, args,
util.shellquote("%s init %s" %
(_serverquote(remotecmd), _serverquote(self.path))))
ui.debug('running %s\n' % cmd)
res = util.system(cmd)
if res != 0:
self._abort(error.RepoError(_("could not create remote repo")))
self._validaterepo(sshcmd, args, remotecmd)
def url(self):
return self._url
def _validaterepo(self, sshcmd, args, remotecmd):
# cleanup up previous run
self.cleanup()
cmd = '%s %s %s' % (sshcmd, args,
util.shellquote("%s -R %s serve --stdio" %
(_serverquote(remotecmd), _serverquote(self.path))))
self.ui.debug('running %s\n' % cmd)
cmd = util.quotecommand(cmd)
# while self.subprocess isn't used, having it allows the subprocess to
# to clean up correctly later
self.pipeo, self.pipei, self.pipee, self.subprocess = util.popen4(cmd)
# skip any noise generated by remote shell
self._callstream("hello")
r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
lines = ["", "dummy"]
max_noise = 500
while lines[-1] and max_noise:
l = r.readline()
self.readerr()
if lines[-1] == "1\n" and l == "\n":
break
if l:
self.ui.debug("remote: ", l)
lines.append(l)
max_noise -= 1
else:
self._abort(error.RepoError(_('no suitable response from '
'remote hg')))
self._caps = set()
for l in reversed(lines):
if l.startswith("capabilities:"):
self._caps.update(l[:-1].split(":")[1].split())
break
def _capabilities(self):
return self._caps
def readerr(self):
while True:
size = util.fstat(self.pipee).st_size
if size == 0:
break
s = self.pipee.read(size)
if not s:
break
for l in s.splitlines():
self.ui.status(_("remote: "), l, '\n')
def _abort(self, exception):
self.cleanup()
raise exception
def cleanup(self):
if self.pipeo is None:
return
self.pipeo.close()
self.pipei.close()
try:
# read the error descriptor until EOF
for l in self.pipee:
self.ui.status(_("remote: "), l)
except (IOError, ValueError):
pass
self.pipee.close()
__del__ = cleanup
def _callstream(self, cmd, **args):
self.ui.debug("sending %s command\n" % cmd)
self.pipeo.write("%s\n" % cmd)
_func, names = wireproto.commands[cmd]
keys = names.split()
wireargs = {}
for k in keys:
if k == '*':
wireargs['*'] = args
break
else:
wireargs[k] = args[k]
del args[k]
for k, v in sorted(wireargs.iteritems()):
self.pipeo.write("%s %d\n" % (k, len(v)))
if isinstance(v, dict):
for dk, dv in v.iteritems():
self.pipeo.write("%s %d\n" % (dk, len(dv)))
self.pipeo.write(dv)
else:
self.pipeo.write(v)
self.pipeo.flush()
return self.pipei
def _callcompressable(self, cmd, **args):
return self._callstream(cmd, **args)
def _call(self, cmd, **args):
self._callstream(cmd, **args)
return self._recv()
def _callpush(self, cmd, fp, **args):
r = self._call(cmd, **args)
if r:
return '', r
while True:
d = fp.read(4096)
if not d:
break
self._send(d)
self._send("", flush=True)
r = self._recv()
if r:
return '', r
return self._recv(), ''
def _calltwowaystream(self, cmd, fp, **args):
r = self._call(cmd, **args)
if r:
# XXX needs to be made better
raise util.Abort('unexpected remote reply: %s' % r)
while True:
d = fp.read(4096)
if not d:
break
self._send(d)
self._send("", flush=True)
return self.pipei
def _recv(self):
l = self.pipei.readline()
if l == '\n':
err = []
while True:
line = self.pipee.readline()
if line == '-\n':
break
err.extend([line])
if len(err) > 0:
# strip the trailing newline added to the last line server-side
err[-1] = err[-1][:-1]
self._abort(error.OutOfBandError(*err))
self.readerr()
try:
l = int(l)
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), l))
return self.pipei.read(l)
def _send(self, data, flush=False):
self.pipeo.write("%d\n" % len(data))
if data:
self.pipeo.write(data)
if flush:
self.pipeo.flush()
self.readerr()
def lock(self):
self._call("lock")
return remotelock(self)
def unlock(self):
self._call("unlock")
def addchangegroup(self, cg, source, url, lock=None):
'''Send a changegroup to the remote server. Return an integer
similar to unbundle(). DEPRECATED, since it requires locking the
remote.'''
d = self._call("addchangegroup")
if d:
self._abort(error.RepoError(_("push refused: %s") % d))
while True:
d = cg.read(4096)
if not d:
break
self.pipeo.write(d)
self.readerr()
self.pipeo.flush()
self.readerr()
r = self._recv()
if not r:
return 1
try:
return int(r)
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), r))
instance = sshpeer