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#!/usr/bin/python3
import argparse
import os
# Implement `command < /dev/null 2>&1 | cat >&2` with `command`
# as the main process (for signals, return status, etc).
# This protects us against node setting stdio non-blocking.
# NB: as of today (node v14.17.0) node doesn't mess with the
# controlling terminal.
parser = argparse.ArgumentParser()
parser.add_argument('cmd', nargs='+', help='The command to run')
args = parser.parse_args()
n = os.open('/dev/null', os.O_RDONLY)
r, w = os.pipe()
if os.fork():
os.dup2(n, 0) # stdin from /dev/null
os.dup2(w, 1) # stdout to cat
os.dup2(w, 2) # stderr to cat
os.execvp(args.cmd[0], args.cmd)
else:
os.dup2(r, 0) # read from wrapped process
os.dup2(2, 1) # all output to stderr
os.execvp('cat', ['cat'])
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