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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
until [-m MAX] [-n SECONDS] COMMAND...
until -h
EOF
}
help() {
cat <<-'EOF'
Options:
-n SECONDS the amount of seconds to sleep between
attempts (default: 5)
-m MAX the maximum number of attempts (default: unlimited)
-h, --help show this message
COMMAND the shell command to be executed
Runs COMMAND until it eventually succeeds, trying atmost MAX
times. Sleep SECONDS between attempts.
Examples:
Try flaky build until it succeeds:
$ until guix home build home.scm
Try atmost 10 timex to build until a new version is successfull,
waiting 30 seconds between attempts:
$ until -m 10 -n 30 -- x git pull AND make
EOF
}
for flag in "$@"; do
case "$flag" in
--)
break
;;
--help)
usage
help
exit
;;
*)
;;
esac
done
_SECONDS=5
while getopts 'm:n:h' flag; do
case "$flag" in
m)
MAX="$OPTARG"
;;
n)
_SECONDS="$OPTARG"
;;
h)
usage
help
exit
;;
*)
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
|
