base-files: add wrapper for procd service list command

A service managed by procd does have a json object with usefull information.
This information could by dumped with the following command.

ubus call service list "{ 'verbose':true, 'name': '<service-name>)'". }"

This line is long and complicated to enter. This commit adds a wrapper
call to the procd service section tool to simplify the input and get the
output faster.

We could now enter the command /etc/initd/<service> info to get the info
faster.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

package/base-files/files/etc/rc.common

@@ -126,6 +126,7 @@ extra_command "enabled" "Check if service is started on boot"
 	extra_command "running" "Check if service is running"
 	extra_command "status" "Service status"
 	extra_command "trace" "Start with syscall trace"
+	extra_command "info" "Dump procd service info"
 
 	. $IPKG_INSTROOT/lib/functions/procd.sh
 	basescript=$(readlink "$initscript")
@@ -149,6 +150,13 @@ extra_command "enabled" "Check if service is started on boot"
 		start "$@"
 	}
 
+	info() {
+		json_init
+		json_add_string name "$(basename ${basescript:-$initscript})"
+		json_add_boolean verbose "1"
+		_procd_ubus_call list
+	}
+
 	stop() {
 		procd_lock
 		stop_service "$@"