abuild: implement initdcheck

this check verifies that the *.initd scripts are #!/sbin/runscript

abuild.in

@@ -254,11 +254,27 @@ fetch() {
 	default_fetch
 }
 
+# verify that all init.d scripts are openrc runscripts
+initdcheck() {
+	local i
+	for i in $source; do
+		case $i in
+		*.initd)
+			head -n 1 "$srcdir"/$i | grep -q '/sbin/runscript' \
+				&& continue
+			error "$i is not an openrc #!/sbin/runscript"
+			return 1
+			;;
+		esac
+	done			
+}
+
 # unpack the sources
 default_unpack() {
 	local u
 	if [ -z "$force" ]; then
 		md5check || return 1
+		initdcheck || return 1
 	fi
 	mkdir -p "$srcdir"
 	for u in $source; do