Mercurial > hg
annotate mercurial/lock.py @ 1981:736b6c96bbbc
make incoming work via ssh (issue139); move chunk code into separate module.
Incoming ssh needs to detect the end of the changegroup, otherwise it would
block trying to read from the ssh pipe. This is done by parsing the
changegroup chunks.
bundlerepo.getchunk() already is identical to
localrepo.addchangegroup.getchunk(), which is followed by getgroup which
looks much like what you can re-use in bundlerepository.__init__() and in
write_bundle(). bundlerevlog.__init__.genchunk() looks very similar, too,
as do some while loops in localrepo.py.
Applied patch from Benoit Boissinot to move duplicate/related code
to mercurial/changegroup.py and use this to fix incoming ssh.
author | Thomas Arendsen Hein <thomas@intevation.de> |
---|---|
date | Tue, 21 Mar 2006 11:47:21 +0100 |
parents | d314a89fa4f1 |
children | ff5c9a92f556 |
rev | line source |
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161 | 1 # lock.py - simple locking scheme for mercurial |
2 # | |
3 # Copyright 2005 Matt Mackall <mpm@selenic.com> | |
4 # | |
5 # This software may be used and distributed according to the terms | |
6 # of the GNU General Public License, incorporated herein by reference. | |
7 | |
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8 from demandload import * |
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9 demandload(globals(), 'errno os socket time util') |
161 | 10 |
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11 class LockException(Exception): |
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12 pass |
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13 class LockHeld(LockException): |
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14 pass |
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15 class LockUnavailable(LockException): |
161 | 16 pass |
17 | |
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18 class lock(object): |
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19 # lock is symlink on platforms that support it, file on others. |
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20 |
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21 # symlink is used because create of directory entry and contents |
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22 # are atomic even over nfs. |
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23 |
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24 # old-style lock: symlink to pid |
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25 # new-style lock: symlink to hostname:pid |
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26 |
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27 def __init__(self, file, timeout=-1, releasefn=None): |
161 | 28 self.f = file |
29 self.held = 0 | |
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30 self.timeout = timeout |
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31 self.releasefn = releasefn |
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32 self.id = None |
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33 self.host = None |
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34 self.pid = None |
161 | 35 self.lock() |
36 | |
37 def __del__(self): | |
38 self.release() | |
39 | |
40 def lock(self): | |
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41 timeout = self.timeout |
161 | 42 while 1: |
43 try: | |
44 self.trylock() | |
45 return 1 | |
46 except LockHeld, inst: | |
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47 if timeout != 0: |
161 | 48 time.sleep(1) |
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49 if timeout > 0: |
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50 timeout -= 1 |
161 | 51 continue |
52 raise inst | |
515 | 53 |
161 | 54 def trylock(self): |
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55 if self.id is None: |
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56 self.host = socket.gethostname() |
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57 self.pid = os.getpid() |
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58 self.id = '%s:%s' % (self.host, self.pid) |
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59 while not self.held: |
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60 try: |
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61 util.makelock(self.id, self.f) |
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62 self.held = 1 |
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63 except (OSError, IOError), why: |
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64 if why.errno == errno.EEXIST: |
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65 locker = self.testlock() |
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66 if locker: |
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67 raise LockHeld(locker) |
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68 else: |
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69 raise LockUnavailable(why) |
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70 |
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71 def testlock(self): |
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72 '''return id of locker if lock is valid, else None.''' |
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73 # if old-style lock, we cannot tell what machine locker is on. |
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74 # with new-style lock, if locker is on this machine, we can |
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75 # see if locker is alive. if locker is on this machine but |
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76 # not alive, we can safely break lock. |
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77 locker = util.readlock(self.f) |
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78 c = locker.find(':') |
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79 if c == -1: |
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80 return locker |
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81 host = locker[:c] |
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82 if host != self.host: |
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83 return locker |
161 | 84 try: |
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85 pid = int(locker[c+1:]) |
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86 except: |
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87 return locker |
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88 if util.testpid(pid): |
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89 return locker |
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90 # if locker dead, break lock. must do this with another lock |
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91 # held, or can race and break valid lock. |
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92 try: |
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93 l = lock(self.f + '.break') |
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94 l.trylock() |
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95 os.unlink(self.f) |
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96 l.release() |
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97 except (LockHeld, LockUnavailable): |
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98 return locker |
161 | 99 |
100 def release(self): | |
101 if self.held: | |
102 self.held = 0 | |
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103 if self.releasefn: |
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104 self.releasefn() |
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105 try: |
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106 os.unlink(self.f) |
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107 except: pass |
161 | 108 |