##// END OF EJS Templates
url: support auth.cookiesfile for adding cookies to HTTP requests...
url: support auth.cookiesfile for adding cookies to HTTP requests Mercurial can't currently send cookies as part of HTTP requests. Some authentication systems use cookies. So, it seems like adding support for sending cookies seems like a useful feature. This patch implements support for reading cookies from a file and automatically sending them as part of the request. We rely on the "cookiejar" Python module to do the heavy lifting of parsing cookies files. We currently only support the Mozilla (really Netscape-era) cookie format. There is another format supported by cookielib and we may want to consider using that, especially since the Netscape cookie parser can't parse ports. It wasn't immediately obvious to me what the format of the other parser is, so I didn't know how to test it. I /think/ it might be literal "Cookie" header values, but I'm not sure. If it is more robust than the Netscape format, we may want to just support it.

File last commit:

r31378:2e48c776 default
r31936:806f9a88 default
Show More
lock.py
264 lines | 8.7 KiB | text/x-python | PythonLexer
# lock.py - simple advisory locking scheme 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.
from __future__ import absolute_import
import contextlib
import errno
import os
import socket
import time
import warnings
from . import (
encoding,
error,
pycompat,
util,
)
def _getlockprefix():
"""Return a string which is used to differentiate pid namespaces
It's useful to detect "dead" processes and remove stale locks with
confidence. Typically it's just hostname. On modern linux, we include an
extra Linux-specific pid namespace identifier.
"""
result = socket.gethostname()
if pycompat.ispy3:
result = result.encode(pycompat.sysstr(encoding.encoding), 'replace')
if pycompat.sysplatform.startswith('linux'):
try:
result += '/%x' % os.stat('/proc/self/ns/pid').st_ino
except OSError as ex:
if ex.errno not in (errno.ENOENT, errno.EACCES, errno.ENOTDIR):
raise
return result
class lock(object):
'''An advisory lock held by one process to control access to a set
of files. Non-cooperating processes or incorrectly written scripts
can ignore Mercurial's locking scheme and stomp all over the
repository, so don't do that.
Typically used via localrepository.lock() to lock the repository
store (.hg/store/) or localrepository.wlock() to lock everything
else under .hg/.'''
# lock is symlink on platforms that support it, file on others.
# symlink is used because create of directory entry and contents
# are atomic even over nfs.
# old-style lock: symlink to pid
# new-style lock: symlink to hostname:pid
_host = None
def __init__(self, vfs, file, timeout=-1, releasefn=None, acquirefn=None,
desc=None, inheritchecker=None, parentlock=None):
self.vfs = vfs
self.f = file
self.held = 0
self.timeout = timeout
self.releasefn = releasefn
self.acquirefn = acquirefn
self.desc = desc
self._inheritchecker = inheritchecker
self.parentlock = parentlock
self._parentheld = False
self._inherited = False
self.postrelease = []
self.pid = self._getpid()
self.delay = self.lock()
if self.acquirefn:
self.acquirefn()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, exc_tb):
self.release()
def __del__(self):
if self.held:
warnings.warn("use lock.release instead of del lock",
category=DeprecationWarning,
stacklevel=2)
# ensure the lock will be removed
# even if recursive locking did occur
self.held = 1
self.release()
def _getpid(self):
# wrapper around util.getpid() to make testing easier
return util.getpid()
def lock(self):
timeout = self.timeout
while True:
try:
self._trylock()
return self.timeout - timeout
except error.LockHeld as inst:
if timeout != 0:
time.sleep(1)
if timeout > 0:
timeout -= 1
continue
raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
inst.locker)
def _trylock(self):
if self.held:
self.held += 1
return
if lock._host is None:
lock._host = _getlockprefix()
lockname = '%s:%d' % (lock._host, self.pid)
retry = 5
while not self.held and retry:
retry -= 1
try:
self.vfs.makelock(lockname, self.f)
self.held = 1
except (OSError, IOError) as why:
if why.errno == errno.EEXIST:
locker = self._readlock()
# special case where a parent process holds the lock -- this
# is different from the pid being different because we do
# want the unlock and postrelease functions to be called,
# but the lockfile to not be removed.
if locker == self.parentlock:
self._parentheld = True
self.held = 1
return
locker = self._testlock(locker)
if locker is not None:
raise error.LockHeld(errno.EAGAIN,
self.vfs.join(self.f), self.desc,
locker)
else:
raise error.LockUnavailable(why.errno, why.strerror,
why.filename, self.desc)
def _readlock(self):
"""read lock and return its value
Returns None if no lock exists, pid for old-style locks, and host:pid
for new-style locks.
"""
try:
return self.vfs.readlock(self.f)
except (OSError, IOError) as why:
if why.errno == errno.ENOENT:
return None
raise
def _testlock(self, locker):
if locker is None:
return None
try:
host, pid = locker.split(":", 1)
except ValueError:
return locker
if host != lock._host:
return locker
try:
pid = int(pid)
except ValueError:
return locker
if util.testpid(pid):
return locker
# if locker dead, break lock. must do this with another lock
# held, or can race and break valid lock.
try:
l = lock(self.vfs, self.f + '.break', timeout=0)
self.vfs.unlink(self.f)
l.release()
except error.LockError:
return locker
def testlock(self):
"""return id of locker if lock is valid, else None.
If old-style lock, we cannot tell what machine locker is on.
with new-style lock, if locker is on this machine, we can
see if locker is alive. If locker is on this machine but
not alive, we can safely break lock.
The lock file is only deleted when None is returned.
"""
locker = self._readlock()
return self._testlock(locker)
@contextlib.contextmanager
def inherit(self):
"""context for the lock to be inherited by a Mercurial subprocess.
Yields a string that will be recognized by the lock in the subprocess.
Communicating this string to the subprocess needs to be done separately
-- typically by an environment variable.
"""
if not self.held:
raise error.LockInheritanceContractViolation(
'inherit can only be called while lock is held')
if self._inherited:
raise error.LockInheritanceContractViolation(
'inherit cannot be called while lock is already inherited')
if self._inheritchecker is not None:
self._inheritchecker()
if self.releasefn:
self.releasefn()
if self._parentheld:
lockname = self.parentlock
else:
lockname = '%s:%s' % (lock._host, self.pid)
self._inherited = True
try:
yield lockname
finally:
if self.acquirefn:
self.acquirefn()
self._inherited = False
def release(self):
"""release the lock and execute callback function if any
If the lock has been acquired multiple times, the actual release is
delayed to the last release call."""
if self.held > 1:
self.held -= 1
elif self.held == 1:
self.held = 0
if self._getpid() != self.pid:
# we forked, and are not the parent
return
try:
if self.releasefn:
self.releasefn()
finally:
if not self._parentheld:
try:
self.vfs.unlink(self.f)
except OSError:
pass
# The postrelease functions typically assume the lock is not held
# at all.
if not self._parentheld:
for callback in self.postrelease:
callback()
# Prevent double usage and help clear cycles.
self.postrelease = None
def release(*locks):
for lock in locks:
if lock is not None:
lock.release()