Run 'Til Good

rtg.sh

#!/bin/bash

# rtg ("Run 'Til Good")
#
# Usage: ./rtg [SLEEP_SECONDS] COMMAND
#
# Runs the specified COMMAND in a loop until it successfully exits
# (i.e., returns exit code 0). Waits SLEEP_SECONDS between attempts to
# run the COMMAND. If SLEEP_SECONDS is not provided, defaults to 60 seconds.

function usage {
    echo "Usage: $0 [SLEEP_SECONDS] COMMAND"
    echo ""
    echo "Runs the specified COMMAND in a loop until it successfully exits"
    echo "(i.e., returns exit code 0). Waits SLEEP_SECONDS between attempts to"
    echo "run the COMMAND. If SLEEP_SECONDS is not provided, defaults to 60 seconds."
    exit 1
}

function timestamp {
    date +"%F %T"
}

SLEEP_SECONDS=60

# Check if the first argument is a number (sleep time)
if [[ "$1" =~ ^[0-9]+$ ]]; then
    SLEEP_SECONDS="$1"
    shift
    # Ensure SLEEP_SECONDS is greater than zero
    if [ "$SLEEP_SECONDS" -le 0 ]; then
        echo "Error: SLEEP_SECONDS must be a positive integer."
        usage
    fi
fi

# Check if command is provided
if [ "$#" -eq 0 ]; then
    echo "Error: No command provided."
    usage
fi

while true; do
    echo "[$(timestamp)] Command: $@"
    "$@" && break
    echo "[$(timestamp)] Waiting $SLEEP_SECONDS seconds to retry"
    sleep "$SLEEP_SECONDS"
done