mmdebstrap/run_null.sh

#!/bin/sh

set -eu

SUDO=
while [ "$#" -gt 0 ]; do
	key="$1"
	case "$key" in
		SUDO)
			SUDO=sudo
			;;
		*)
			echo "Unknown argument: $key"
			exit 1
			;;
	esac
	shift
done

# - Run command with fds 3 and 4 closed so that whatever test.sh does it
#   cannot interfere with these.
# - Both stdin and stderr of test.sh are written to stdout
# - Write exit status of test.sh to fd 3
# - Write stdout to shared/output.txt as well as to fd 4
# - Redirect fd 3 to stdout
# - Read fd 3 and let the group exit with that value
# - Redirect fd 4 to stdout
ret=0
{ { { {
        ret=0;
        ( exec 3>&- 4>&-; env --chdir=./shared $SUDO sh -x ./test.sh 2>&1) || ret=$?;
        echo $ret >&3;
      } | tee shared/output.txt >&4;
    } 3>&1;
  } | { read -r xs; exit "$xs"; }
} 4>&1 || ret=$?
if [ "$ret" -ne 0 ]; then
	echo "test.sh failed"
	exit 1
fi