Capture another program's std{in,out,err} (Python)

stddump

#! /usr/bin/env python
#
# stddump - A command line tool to capture std{in,out,err}
#
# Copyright (C) 2011 Sebastian Pipping <[email protected]>
# Licensed under GPL v3 or later
#
# 2011-03-01 14:30 UTC+1

import subprocess
import sys
import os

try:
	command = os.environ['STDDUMP_COMMAND']
except:
	print "stddump: Variable STDDUMP_COMMAND need be set, cannot continue"
	sys.exit(1)

args = [command, ] + sys.argv[1:]

stdin_grabber = subprocess.Popen(["tee", "stdin"],
	stdout=subprocess.PIPE)
monitee = subprocess.Popen(args,
	stdin=stdin_grabber.stdout,
	stdout=subprocess.PIPE,
	stderr=subprocess.PIPE)
stdout_grabber = subprocess.Popen(["tee", "stdout"],
	stdin=monitee.stdout)
stderr_grabber = subprocess.Popen(["tee", "stderr"],
	stdin=monitee.stderr,
	stdout=sys.stderr)

monitee.wait()
stdin_grabber.terminate()
sys.exit(monitee.returncode)