use overlayfs for /etc

recipes-diya/diya-overlay/diya-overlay.bb

@@ -17,14 +17,14 @@ GROUPADD_PACKAGES = "${PN}"
 USERADD_PARAM:${PN} = "-u 1000 -d /home/diya -r -s /bin/sh diya"
 
 INITSCRIPT_NAME = "confd"
-INITSCRIPT_PARAMS = "start 80 S ."
+INITSCRIPT_PARAMS = "start 0 S ."
 
 do_install() {
     install -d ${D}/${sysconfdir}/init.d/
     install -m 0755 ${WORKDIR}/confd ${D}/${sysconfdir}/init.d/confd
     install -d ${D}/usr/bin/
     install -d ${D}/etc/default/volatiles
-	install -m 0644 ${WORKDIR}/80_diya ${D}${sysconfdir}/default/volatiles
+	# install -m 0644 ${WORKDIR}/80_diya ${D}${sysconfdir}/default/volatiles
     install -m 0755 ${WORKDIR}/expandfs.sh ${D}/usr/bin/expandfs.sh
     install -m 0755 ${WORKDIR}/fs_resize ${DEPLOY_DIR_IMAGE}/
 

recipes-diya/diya-overlay/files/80_diya

@@ -1,4 +1,3 @@
 # d root root 0755 /var/etc/upper none
 # d root root 0755 /var/etc/work none
-
 # l root root 0644 /etc/dropbear /var/etc/dropbear

recipes-diya/diya-overlay/files/confd

@@ -6,6 +6,9 @@ DESC="Auto deployment configuration from media"
 case "$1" in
     start)
         echo -n "Start $DESC: "
+        # mount the overlay which is not auto mount by fstab
+        # this make /etc editable
+        mount -t overlay -o lowerdir=/etc,upperdir=/var/etc/upper,workdir=/var/etc/work overlay /etc
         # for some reason the LCD backlight is turned off
         # need to turn it on manually
         echo  0 > /sys/class/backlight/backlight/bl_power
@@ -31,7 +34,6 @@ case "$1" in
         # display information
         # disable wifi power save
         /usr/sbin/iw wlan0 set power_save off
-        /sbin/ip a
     ;;
     *)
         N=/etc/init.d/$NAME