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#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
until [-m MAX] [-n SECONDS] COMMAND...
EOF
}
_SECONDS=5
while getopts 'm:n:h' flag; do
case "$flag" in
(m)
MAX="$OPTARG"
;;
(n)
_SECONDS="$OPTARG"
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
ATTEMPT=1
while true; do
printf 'Attempt %s.\n' "$ATTEMPT" >&2
ATTEMPT=$((ATTEMPT + 1))
if "$@"; then
break
fi
if [ -n "${MAX:-}" ] && [ "$ATTEMPT" -gt "$MAX" ]; then
printf 'Maximum number of attempts reached: %s.\n' "$MAX" >&2
exit 1
fi
sleep "$_SECONDS"
done
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