package/modem-manager: init script for systemV-like init systems

ModemManager get started by NetworkManager, in case of systemd init
system. In case of other systems it needs to be started by init script.

Debian [1] solved it by detection in code. For Buildroot it's IMHO
enough to install init script for systemV-like init systems.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770871

[Thomas:
 - slightly simplify the script by removing the MODEMMANAGER_BIN
   variable which was used at only one place, and use directly $?
   instead of an intermediate $ret variable.
 - split the too long line added in the .mk file.]

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/modem-manager/S44modem-manager

@@ -0,0 +1,42 @@
+#!/bin/sh
+#
+# Starts ModemManager
+#
+
+PIDFILE=/var/run/ModemManager.pid
+
+[ -x $MODEMMANAGER_BIN ] || exit 0
+
+start() {
+	echo -n "Starting ModemManager: "
+	umask 077
+	start-stop-daemon -S -q -b -m -p $PIDFILE \
+		--exec /usr/sbin/ModemManager
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+}
+stop() {
+	echo -n "Stopping ModemManager: "
+	start-stop-daemon -K -q -p $PIDFILE
+	[ $? = 0 ] && { echo "OK"; rm -f $PIDFILE; } || echo "FAIL"
+}
+restart() {
+	stop
+	start
+}
+
+case "$1" in
+	start)
+		start
+		;;
+	stop)
+		stop
+		;;
+	restart|reload)
+		restart
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+esac
+
+exit $ret

package/modem-manager/modem-manager.mk

@@ -26,4 +26,9 @@ else
 MODEM_MANAGER_CONF_OPTS += --without-mbim
 endif
 
+define MODEM_MANAGER_INSTALL_INIT_SYSV
+	$(INSTALL) -m 0755 -D package/modem-manager/S44modem-manager \
+		$(TARGET_DIR)/etc/init.d/S44modem-manager
+endef
+
 $(eval $(autotools-package))