588e87590d
* add support for systemd, OpenRC, SysVinit, and Dinit * add automatic init-system detection through CMake * make libsystemd optional for non-systemd builds * add native service definitions for all supported init systems * add Gentoo ebuild and Alpine APKBUILD packaging support * publish the official BastionGuard source repository * update the README with supported distributions, init systems, repository information, and build documentation
113 lines
2.3 KiB
Bash
Executable file
113 lines
2.3 KiB
Bash
Executable file
#!/bin/sh
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# Minimal foreground supervisor for init systems without native Restart=.
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set -u
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restart=on-failure
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delay=5
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workdir=/
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logfile=""
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usage() {
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echo "usage: $0 [--restart always|on-failure|never] [--delay SEC] [--chdir DIR] [--log FILE] -- command [args...]" >&2
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exit 64
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}
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while [ "$#" -gt 0 ]; do
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case "$1" in
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--restart)
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[ "$#" -ge 2 ] || usage
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restart=$2
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shift 2
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;;
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--delay)
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[ "$#" -ge 2 ] || usage
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delay=$2
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shift 2
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;;
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--chdir)
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[ "$#" -ge 2 ] || usage
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workdir=$2
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shift 2
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;;
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--log)
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[ "$#" -ge 2 ] || usage
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logfile=$2
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shift 2
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;;
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--)
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shift
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break
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;;
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*) usage ;;
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esac
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done
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[ "$#" -gt 0 ] || usage
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case "$restart" in always|on-failure|never) ;; *) usage ;; esac
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case "$delay" in ""|*[!0-9]*) usage ;; esac
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[ -d "$workdir" ] || mkdir -p "$workdir" 2>/dev/null || exit 73
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if [ -n "$logfile" ]; then
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logdir=$(dirname "$logfile")
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[ -d "$logdir" ] || mkdir -p "$logdir" 2>/dev/null || exit 73
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fi
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stopping=0
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child=""
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forward_term() {
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stopping=1
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if [ -n "$child" ]; then
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target=$child
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kill -TERM "$target" 2>/dev/null || true
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count=0
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while kill -0 "$target" 2>/dev/null && [ "$count" -lt 30 ]; do
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sleep 0.1
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count=$((count + 1))
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done
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kill -KILL "$target" 2>/dev/null || true
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fi
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}
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forward_hup() {
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if [ -n "$child" ]; then
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kill -HUP "$child" 2>/dev/null || true
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fi
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}
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trap forward_term INT TERM
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trap forward_hup HUP
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while [ "$stopping" -eq 0 ]; do
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(
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cd "$workdir" || exit 73
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if [ -n "$logfile" ]; then
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exec "$@" >>"$logfile" 2>&1
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fi
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exec "$@"
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) &
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child=$!
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wait "$child"
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status=$?
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child=""
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[ "$stopping" -eq 0 ] || exit 0
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case "$restart" in
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never) exit "$status" ;;
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on-failure)
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[ "$status" -ne 0 ] || exit 0
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;;
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always) ;;
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esac
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[ "$delay" -eq 0 ] || {
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sleep "$delay" &
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child=$!
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wait "$child" 2>/dev/null || true
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child=""
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}
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done
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exit 0
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