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#!/usr/bin/env python
#
# Copyright (C) 2014 Wind River Systems, Inc.
#
# Description: Calls other scripts in order, so that there can be multiple
# scripts for a particular hook tied to libvirt.
#
# For example: If this script is called "qemu" and is in the
# "/etc/libvirt/hooks/" directory. This script will be called by libvirt
# when certain actions are performed on a qemu guest. This script then
# will in turn call any executable file in the same directory matching
# "qemu-" followed by at least one alpha-numeric character. The scripts
# are called in order (based on the python sorted function), and once any
# sub-script returns a non-zero exit code no futher scripts are called.
# This script passes any arguments it retrieves on the command line and a
# copy of stdin to the sub-scripts it calls.
import os
import re
import subprocess
import sys
def main():
return_value = 0
hook_name = os.path.basename( __file__ )
try:
hook_dir = os.path.dirname( __file__ )
hook_args = sys.argv
del hook_args[ 0 ] # Remove executable from argument list
# Save stdin, so we can pass it to each sub-script.
if sys.stdin.isatty():
stdin_save = [ "" ]
else:
stdin_save = sys.stdin.readlines()
# Match the name name of the hook + a dash + atleast
# one alpha-numeric character.
matcher = re.compile( "%s-\w+" % hook_name )
for file_name in sorted( os.listdir( hook_dir ) ):
file_path = os.path.join( hook_dir, file_name )
if matcher.match( file_name ) \
and os.access( file_path, os.X_OK ) \
and os.path.isfile( file_path ) \
and return_value == 0:
cmd = [ file_path ] + hook_args
p = subprocess.Popen( cmd, stdin=subprocess.PIPE )
p.communicate( input = ''.join( stdin_save ) )[0]
return_value = p.wait()
except Exception as e:
sys.stderr.write( "%s hook error: %s\n" % ( hook_name, str( e ) ) )
return_value = 1
return return_value
if __name__ == '__main__':
sys.exit( main() )
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