annotate mercurial/lock.py @ 13944:bc32bb0e909f

util: new function checkfilename checkfilename checks for restrictions on filenames imposed by Mercurial itself, irrespective of on what platform it is run.
author Adrian Buehlmann <adrian@cadifra.com>
date Fri, 15 Apr 2011 16:15:30 +0200
parents 95de08ffa324
children 1ffeeb91c55d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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cfdcb7a465af localrepo: document the locking scheme a little better
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1 # lock.py - simple advisory locking scheme for mercurial
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2 #
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 import util, error
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9 import errno, os, socket, time
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10 import warnings
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11
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12 class lock(object):
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13 '''An advisory lock held by one process to control access to a set
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14 of files. Non-cooperating processes or incorrectly written scripts
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15 can ignore Mercurial's locking scheme and stomp all over the
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16 repository, so don't do that.
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17
cfdcb7a465af localrepo: document the locking scheme a little better
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18 Typically used via localrepository.lock() to lock the repository
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19 store (.hg/store/) or localrepository.wlock() to lock everything
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20 else under .hg/.'''
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21
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22 # lock is symlink on platforms that support it, file on others.
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23
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24 # symlink is used because create of directory entry and contents
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25 # are atomic even over nfs.
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26
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27 # old-style lock: symlink to pid
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28 # new-style lock: symlink to hostname:pid
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29
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30 _host = None
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31
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32 def __init__(self, file, timeout=-1, releasefn=None, desc=None):
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33 self.f = file
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34 self.held = 0
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35 self.timeout = timeout
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36 self.releasefn = releasefn
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37 self.desc = desc
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38 self.lock()
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39
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40 def __del__(self):
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41 if self.held:
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42 warnings.warn("use lock.release instead of del lock",
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43 category=DeprecationWarning,
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44 stacklevel=2)
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45
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46 # ensure the lock will be removed
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47 # even if recursive locking did occur
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48 self.held = 1
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49
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50 self.release()
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51
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52 def lock(self):
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53 timeout = self.timeout
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54 while 1:
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55 try:
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56 self.trylock()
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57 return 1
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58 except error.LockHeld, inst:
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59 if timeout != 0:
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60 time.sleep(1)
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61 if timeout > 0:
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62 timeout -= 1
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63 continue
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64 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
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65 inst.locker)
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66
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67 def trylock(self):
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68 if self.held:
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69 self.held += 1
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70 return
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71 if lock._host is None:
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72 lock._host = socket.gethostname()
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73 lockname = '%s:%s' % (lock._host, os.getpid())
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74 while not self.held:
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75 try:
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76 util.makelock(lockname, self.f)
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77 self.held = 1
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78 except (OSError, IOError), why:
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79 if why.errno == errno.EEXIST:
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80 locker = self.testlock()
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81 if locker is not None:
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82 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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85 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 util.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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121 def release(self):
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122 if self.held > 1:
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123 self.held -= 1
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124 elif self.held == 1:
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125 self.held = 0
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126 if self.releasefn:
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127 self.releasefn()
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128 try:
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129 util.unlink(self.f)
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130 except OSError:
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131 pass
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132
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133 def release(*locks):
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134 for lock in locks:
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135 if lock is not None:
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136 lock.release()
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
137