OpenWrt – Rev 1

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#
# service: simple wrapper around start-stop-daemon
#
# Usage: service ACTION EXEC ARGS...
#
# Action:
#   -C  check if EXEC is alive
#   -S  start EXEC, passing it ARGS as its arguments
#   -K  kill EXEC, sending it a TERM signal if not specified otherwise
#
# Environment variables exposed:
#   SERVICE_DAEMONIZE   run EXEC in background
#   SERVICE_WRITE_PID   create a pid-file and use it for matching
#   SERVICE_MATCH_EXEC  use EXEC command-line for matching (default)
#   SERVICE_MATCH_NAME  use EXEC process name for matching
#   SERVICE_USE_PID     assume EXEC create its own pid-file and use it for matching
#   SERVICE_NAME        process name to use (default to EXEC file part)
#   SERVICE_PID_FILE    pid file to use (default to /var/run/$SERVICE_NAME.pid)
#   SERVICE_SIG         signal to send when using -K
#   SERVICE_SIG_RELOAD  default signal used when reloading
#   SERVICE_SIG_STOP    default signal used when stopping
#   SERVICE_STOP_TIME   time to wait for a process to stop gracefully before killing it
#   SERVICE_UID         user EXEC should be run as
#   SERVICE_GID         group EXEC should be run as
#
#   SERVICE_DEBUG       don't do anything, but show what would be done
#   SERVICE_QUIET       don't print anything
#

SERVICE_QUIET=1
SERVICE_SIG_RELOAD="HUP"
SERVICE_SIG_STOP="TERM"
SERVICE_STOP_TIME=5
SERVICE_MATCH_EXEC=1

service() {
        local ssd
        local exec
        local name
        local start
        ssd="${SERVICE_DEBUG:+echo }start-stop-daemon${SERVICE_QUIET:+ -q}"
        case "$1" in
          -C)
                ssd="$ssd -K -t"
                ;;
          -S)
                ssd="$ssd -S${SERVICE_DAEMONIZE:+ -b}${SERVICE_WRITE_PID:+ -m}"
                start=1
                ;;
          -K)
                ssd="$ssd -K${SERVICE_SIG:+ -s $SERVICE_SIG}"
                ;;
          *)
                echo "service: unknown ACTION '$1'" 1>&2
                return 1
        esac
        shift
        exec="$1"
        [ -n "$exec" ] || {
                echo "service: missing argument" 1>&2
                return 1
        }
        [ -x "$exec" ] || {
                echo "service: file '$exec' is not executable" 1>&2
                return 1
        }
        name="${SERVICE_NAME:-${exec##*/}}"
        [ -z "$SERVICE_USE_PID$SERVICE_WRITE_PID$SERVICE_PID_FILE" ] \
                || ssd="$ssd -p ${SERVICE_PID_FILE:-/var/run/$name.pid}"
        [ -z "$SERVICE_MATCH_NAME" ] || ssd="$ssd -n $name"
        ssd="$ssd${SERVICE_UID:+ -c $SERVICE_UID${SERVICE_GID:+:$SERVICE_GID}}"
        [ -z "$SERVICE_MATCH_EXEC$start" ] || ssd="$ssd -x $exec"
        shift
        $ssd${1:+ -- "$@"}
}

service_check() {
        service -C "$@"
}

service_signal() {
        SERVICE_SIG="${SERVICE_SIG:-USR1}" service -K "$@"
}

service_start() {
        service -S "$@"
}

service_stop() {
        local try
        SERVICE_SIG="${SERVICE_SIG:-$SERVICE_SIG_STOP}" service -K "$@" || return 1
        while [ $((try++)) -lt $SERVICE_STOP_TIME ]; do
                service -C "$@" || return 0
                sleep 1
        done
        SERVICE_SIG="KILL" service -K "$@"
        sleep 1
        ! service -C "$@"
}

service_reload() {
        SERVICE_SIG="${SERVICE_SIG:-$SERVICE_SIG_RELOAD}" service -K "$@"
}