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#!/usr/bin/python
import sys
if len(sys.argv) < 3 :
print """
This script launches a commandline just if it can adquire a given lock
file. It can be used to avoid duplicated instances of an application.
$ runOnce.py /path/to/the/lock/file.lock program arg1 arg2....
"""
sys.exit(-1)
import os
class FileLock :
def __init__(self, filename) :
try:
self.filename = filename
self.lockfd = os.open(filename, os.O_RDWR|os.O_EXCL|os.O_CREAT)
os.write(self.lockfd, str(os.getpid()))
except OSError:
self.lockfd = None
def wasAdquired(self): return not self.lockfd is None
def __del__(self) :
if not self.lockfd : return
os.close(self.lockfd)
os.remove(self.filename)
import time
import sys
import subprocess
lockfile = sys.argv[1]
command = sys.argv[2:]
lock = FileLock(lockfile)
if lock.wasAdquired() :
subprocess.call(command)
del lock
sys.exit()
print "Already running. Remove the file %s if you think it is not"%lockfile
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