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#!/usr/bin/python
import sys
import ec2init
def Usage(out = sys.stdout):
out.write("Usage: cloud-init-run-module freq sem-name mod-name [args]\n")
def main():
# expect to be called with
# <freq> <semaphore-name> <module-name> args
if len(sys.argv) < 4:
Usage(sys.stderr)
sys.exit(1)
(freq,semname,modname)=sys.argv[1:4]
run_args=sys.argv[4:]
if ec2init.sem_has_run(semname,freq):
sys.stderr.write("%s already ran %s\n" % (semname,freq))
sys.exit(0)
try:
mod = __import__('ec2init.' + modname)
inst = getattr(mod,modname)
except:
sys.stderr.write("Failed to load module ec2init.%s\n" % modname)
sys.exit(1)
import os
cfg_path = None
cfg_env_name = ec2init.cfg_env_name
if os.environ.has_key(cfg_env_name):
cfg_path = os.environ[cfg_env_name]
try:
if not ec2init.sem_acquire(semname,freq):
sys.stderr.write("Failed to acquire lock on %s\n" % semname)
sys.exit(1)
inst.run(run_args,cfg_path)
except:
ec2init.sem_clear(semname,freq)
raise
sys.exit(0)
if __name__ == '__main__':
main()
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