py-i2phosts-checker: add run_prog()

Needed for run other tools in common way.

py-i2phosts-checker

@@ -3,12 +3,14 @@
 import os
 import sys
 import pwd
+import errno
 import argparse
 import datetime
 import time
 import hashlib
 import base64
 import configobj
+import subprocess
 import daemon
 import daemon.pidlockfile
 
@@ -48,6 +50,20 @@ def check():
 	S.close()
 	log.info('check finished')
 
+def run_prog(prog):
+	try:
+		log.info('launching %s (see his log for details)', prog)
+		p = subprocess.Popen([prog], shell=False, stdin=None,
+				stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+	except OSError, e:
+		log.error('failed to exec %s: %s', prog, e)
+		if e.errno == errno.ENOENT:
+			log.error('maybe it isn\'t in PATH')
+	else:
+		out = p.communicate()[0]
+		if out:
+			log.info('got output from %s: %s', prog, out)
+
 def main():
 	while True:
 		check()