busybox-udhcpc: add default file to control the modification of /etc/resolv.conf

- using commit aee3a65e2a,
  which fixes the route metrics from holger for all machines

Fixes: SYS#1126

recipes-core/busybox/busybox_sysmocom.inc

@@ -1,21 +1,25 @@
 SYSMOCOM := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
 FILESEXTRAPATHS_prepend := "${SYSMOCOM}/busybox-${SYSMOCOM_ORIG_PV}:${SYSMOCOM}/files:"
-PRINC = "26"
+PRINC = "27"
 
 SRC_URI += "file://busybox-ifplugd.sh \
             file://ifplugd.sh \
             file://udhcpc-ntp.sh \
             file://udhcpc-ntp.default \
+            file://udhcpc.default \
            "
 
 PACKAGES =+ "${PN}-ifplugd ${PN}-udhcpc-ntp"
 
+FILES_${PN}-udhcpc += "${sysconfdir}/default/udhcpc"
+
 FILES_${PN}-ifplugd = "${sysconfdir}/ifplugd.sh ${sysconfdir}/init.d/busybox-ifplugd.sh"
 
 FILES_${PN}-udhcpc-ntp = "${sysconfdir}/udhcpc.d/60ntp \
                           ${sysconfdir}/default/udhcpc-ntp \
                          "
 
+CONFFILES_${PN}-udhcpc += "${sysconfdir}/default/udhcpc"
 CONFFILES_${PN}-udhcpc-ntp = "${sysconfdir}/default/udhcpc-ntp"
 
 INITSCRIPT_PACKAGES += "${PN}-ifplugd"
@@ -30,4 +34,5 @@ do_install_append() {
 	install -m 0755 ${WORKDIR}/udhcpc-ntp.sh ${D}/${sysconfdir}/udhcpc.d/60ntp
 	install -d ${D}/${sysconfdir}/default
 	install -m 0644 ${WORKDIR}/udhcpc-ntp.default ${D}/${sysconfdir}/default/udhcpc-ntp
+        install -m 0644 ${WORKDIR}/udhcpc.default ${D}/${sysconfdir}/default/udhcpc
 }

recipes-core/busybox/files/simple.script

@@ -4,7 +4,12 @@
 
 [ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
 
+
+
 RESOLV_CONF="/etc/resolv.conf"
+
+[ -r /etc/default/udhcpc ] && . /etc/default/udhcpc
+
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 [ -n "$subnet" ] && NETMASK="netmask $subnet"
 
@@ -64,7 +69,7 @@ case "$1" in
                                 metric=$(($metric + 1))
 			done
 		fi
-
+                if [ "$STATIC_DNS" != "yes" ]; then
 			# Update resolver configuration file
 			R=""
 			[ -n "$domain" ] && R="domain $domain
@@ -80,6 +85,7 @@ case "$1" in
 			else
 				echo -n "$R" > "$RESOLV_CONF"
 			fi
+                fi
 		;;
 esac
 

recipes-core/busybox/files/udhcpc.default

@@ -0,0 +1,2 @@
+# Uncomment the following line, if udhcpc should not touch /etc/resolv.conf
+# STATIC_DNS="yes"