Catch hgrc interpolation errors nicely.
# lock.py - simple locking scheme for mercurial
#
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
from demandload import *
demandload(globals(), 'errno os time util')
class LockException(Exception):
pass
class LockHeld(LockException):
pass
class LockUnavailable(LockException):
pass
class lock(object):
def __init__(self, file, timeout=-1, releasefn=None):
self.f = file
self.held = 0
self.timeout = timeout
self.releasefn = releasefn
self.lock()
def __del__(self):
self.release()
def lock(self):
timeout = self.timeout
while 1:
try:
self.trylock()
return 1
except LockHeld, inst:
if timeout != 0:
time.sleep(1)
if timeout > 0:
timeout -= 1
continue
raise inst
def trylock(self):
pid = os.getpid()
try:
util.makelock(str(pid), self.f)
self.held = 1
except (OSError, IOError), why:
if why.errno == errno.EEXIST:
raise LockHeld(util.readlock(self.f))
else:
raise LockUnavailable(why)
def release(self):
if self.held:
self.held = 0
if self.releasefn:
self.releasefn()
try:
os.unlink(self.f)
except: pass