A shell script for supervising and keeping processes alive.

supervise.sh

#!/bin/sh

set -e

if [[ "$#" -lt 2 || ! -x "$2" ]]; then
	echo "Usage: supervise log_tag program [program-argument...]" >&2
	exit 2
fi

LOG_TAG="$1"
shift

set +e -o pipefail

while true; do
	STARTED_AT="$(date +%s)"
	"$@" 2>&1 | logger -t "${LOG_TAG}[$(pgrep -oP "$$")]"
	EXIT_CODE="$?"
	for CODE in 0 137 143; do [[ "${CODE}" -eq "${EXIT_CODE}" ]] && exit 0; done
	[[ "$(($(date +%s)-${STARTED_AT}))" -gt 5 ]] && sleep 0.1 || sleep 5
done