author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 11:13:36 +0530 | |
changeset 114 | 1a88b04adb39 |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
# lock.py - simple advisory locking scheme for mercurial |
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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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|
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import util, error |
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import errno, os, socket, time |
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import warnings |
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|
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class lock(object): |
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'''An advisory lock held by one process to control access to a set |
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of files. Non-cooperating processes or incorrectly written scripts |
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can ignore Mercurial's locking scheme and stomp all over the |
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repository, so don't do that. |
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|
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Typically used via localrepository.lock() to lock the repository |
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store (.hg/store/) or localrepository.wlock() to lock everything |
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else under .hg/.''' |
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|
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# lock is symlink on platforms that support it, file on others. |
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|
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# symlink is used because create of directory entry and contents |
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# are atomic even over nfs. |
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|
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# old-style lock: symlink to pid |
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# new-style lock: symlink to hostname:pid |
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|
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_host = None |
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def __init__(self, file, timeout=-1, releasefn=None, desc=None): |
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self.f = file |
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self.held = 0 |
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self.timeout = timeout |
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self.releasefn = releasefn |
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self.desc = desc |
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self.lock() |
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def __del__(self): |
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if self.held: |
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warnings.warn("use lock.release instead of del lock", |
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category=DeprecationWarning, |
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stacklevel=2) |
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|
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# ensure the lock will be removed |
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# even if recursive locking did occur |
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self.held = 1 |
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|
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self.release() |
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|
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def lock(self): |
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timeout = self.timeout |
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while 1: |
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try: |
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self.trylock() |
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return 1 |
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except error.LockHeld, inst: |
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if timeout != 0: |
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time.sleep(1) |
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if timeout > 0: |
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timeout -= 1 |
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continue |
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raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
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inst.locker) |
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66 |
|
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def trylock(self): |
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if self.held: |
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self.held += 1 |
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return |
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if lock._host is None: |
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lock._host = socket.gethostname() |
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lockname = '%s:%s' % (lock._host, os.getpid()) |
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while not self.held: |
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try: |
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util.makelock(lockname, self.f) |
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self.held = 1 |
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except (OSError, IOError), why: |
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if why.errno == errno.EEXIST: |
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80 |
locker = self.testlock() |
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if locker is not None: |
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raise error.LockHeld(errno.EAGAIN, self.f, self.desc, |
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83 |
locker) |
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84 |
else: |
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raise error.LockUnavailable(why.errno, why.strerror, |
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86 |
why.filename, self.desc) |
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87 |
|
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88 |
def testlock(self): |
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89 |
"""return id of locker if lock is valid, else None. |
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90 |
|
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91 |
If old-style lock, we cannot tell what machine locker is on. |
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92 |
with new-style lock, if locker is on this machine, we can |
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93 |
see if locker is alive. If locker is on this machine but |
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94 |
not alive, we can safely break lock. |
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95 |
|
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96 |
The lock file is only deleted when None is returned. |
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97 |
|
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98 |
""" |
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99 |
locker = util.readlock(self.f) |
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100 |
try: |
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101 |
host, pid = locker.split(":", 1) |
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102 |
except ValueError: |
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103 |
return locker |
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104 |
if host != lock._host: |
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105 |
return locker |
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106 |
try: |
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107 |
pid = int(pid) |
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108 |
except ValueError: |
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109 |
return locker |
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110 |
if util.testpid(pid): |
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111 |
return locker |
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112 |
# if locker dead, break lock. must do this with another lock |
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113 |
# held, or can race and break valid lock. |
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114 |
try: |
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115 |
l = lock(self.f + '.break', timeout=0) |
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116 |
os.unlink(self.f) |
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117 |
l.release() |
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118 |
except error.LockError: |
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119 |
return locker |
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120 |
|
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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121 |
def release(self): |
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parents:
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122 |
if self.held > 1: |
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parents:
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123 |
self.held -= 1 |
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parents:
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124 |
elif self.held == 1: |
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parents:
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125 |
self.held = 0 |
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parents:
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126 |
if self.releasefn: |
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parents:
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127 |
self.releasefn() |
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parents:
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128 |
try: |
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parents:
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129 |
os.unlink(self.f) |
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parents:
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130 |
except OSError: |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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131 |
pass |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
132 |
|
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parents:
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|
133 |
def release(*locks): |
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parents:
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134 |
for lock in locks: |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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135 |
if lock is not None: |
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parents:
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136 |
lock.release() |
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parents:
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137 |