package/base-files: enhance service functions

 * allow matching process by name (useful for processes changing it)
 * check if first argument is executable
 * fix function name used in error messages

SVN-Revision: 28991

package/base-files/files/lib/functions.sh

@@ -287,12 +287,15 @@ uci_apply_defaults() {
 #
 # Environment variables exposed:
 #   SERVICE_DAEMONIZE    run EXEC in background
-#   SERVICE_WRITE_PID    create a pid file and use it
-#   SERVICE_USE_PID      assume EXEC creates its own pid file and use it
-#   SERVICE_PID_FILE     pid file to use (default to /var/run/EXEC.pid)
+#   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 for reloading
-#   SERVICE_SIG_STOP     default signal used for stopping
+#   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
@@ -305,9 +308,13 @@ 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 "$1" in
 	  -C)
@@ -315,24 +322,31 @@ service() {
 		;;
 	  -S)
 		ssd="$ssd -S${SERVICE_DAEMONIZE:+ -b}${SERVICE_WRITE_PID:+ -m}"
+		start=1
 		;;
 	  -K)
 		ssd="$ssd -K${SERVICE_SIG:+ -s $SERVICE_SIG}"
 		;;
 	  *)
-		echo "ssd: unknow action '$1'" 1>&2
+		echo "service: unknown ACTION '$1'" 1>&2
 		return 1
 	esac
 	shift
-	if [ -z "$1" ]; then
-		echo "ssd: missing arguments" 1>&2
+	exec="$1"
+	[ -n "$exec" ] || {
+		echo "service: missing argument" 1>&2
 		return 1
-	fi
-	ssd="$ssd -x $1"
-	if [ -n "$SERVICE_PID_FILE$SERVICE_USE_PID$SERVICE_WRITE_PID" ]; then
-		ssd="$ssd -p ${SERVICE_PID_FILE:-/var/run/${1##*/}.pid}"
-	fi
+	}
+	[ -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:+ -- "$@"}
 }