add first working meta-layer

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

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+# 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/boot-to-recovery

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+#! /bin/sh
+
+if [[ $(/usr/bin/id -u) -ne 0 ]]; then
+    echo "$0 shall be run as root"
+    exit 1
+fi
+
+. /etc/profile
+
+if [ ! -e /boot/config.txt ]; then
+    # prepare env for recovery boot
+    cat << EOF > /boot/config.txt
+recovery=true
+recovery_image=recovery-${MACHINE}.cpio.gz
+EOF
+else
+    sed -i 's/^.*recovery.*/recovery=true/g' /boot/config.txt || \
+                echo "recovery=true" >> /boot/config.txt
+fi
+echo "Rebooting to recovery mode"
+reboot

recipes-diya/diya-overlay/files/confd

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+#!/bin/sh
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+DESC="Auto deployment configuration from media"
+
+case "$1" in
+    start)
+        echo -n "Start $DESC: "
+        # mount the overlay which is not auto mount by fstab
+        # this make /etc editable
+        mount -t overlay -o lowerdir=/etc,upperdir=/var/etc/upper,workdir=/var/etc/work overlay /etc
+        # for some reason the LCD backlight is turned off
+        # need to turn it on manually
+        if [ -f "/boot/fs_resize" ]; then
+            /sbin/expandfs.sh
+            touch /boot/home_partition_should_be_formated
+            rm /boot/fs_resize
+            reboot
+        fi
+        if [ -f "/boot/home_partition_should_be_formated" ]; then
+            echo "Trying to format the home partition"
+            umount /dev/mmcblk1p4
+            yes | mkfs.ext4 /dev/mmcblk1p4
+            mount /dev/mmcblk1p4 /home
+            mkdir -p /home/diya
+            chown -R diya:diya /home/diya
+            rm /boot/home_partition_should_be_formated
+        fi
+        if [ -e "/boot/wpa_supplicant.conf" ];then
+            mv /boot/wpa_supplicant.conf /etc/network/
+            reboot
+        fi
+        # display information
+        # disable wifi power save
+        # /usr/sbin/iw wlan0 set power_save off
+    ;;
+    *)
+        N=/etc/init.d/$NAME
+        echo "Usage: $N {start}" >&2
+        exit 1
+    ;;
+esac
+
+exit 0

recipes-diya/diya-overlay/files/expandfs.sh

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+#! /bin/sh
+
+if [[ $(/usr/bin/id -u) -ne 0 ]]; then
+    echo "$0 shall be run as root"
+    exit 1
+fi
+
+line=$(
+sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk /dev/mmcblk1 | grep /dev/mmcblk1p4
+p
+q
+EOF
+)
+
+echo "Partition: $line"
+#start_sector=$(echo "$line" | cut -d' ' -f14)
+start_sector=$(echo "$line" | cut -d' ' -f15)
+echo "Start sector is: $start_sector"
+
+if [ -z "$start_sector" ]; then
+	echo "Cannot find the start sector"
+	exit 1
+fi
+
+echo "Expanding the partition"
+sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk /dev/mmcblk1p4
+d # delete partition
+4 # number 4
+n # new partition
+p # primary partition
+4 # partition number 4
+$start_sector
+  # default - end of disk 
+p # print the in-memory partition table
+w # write the partition table
+q # and we're done
+EOF

recipes-diya/diya-overlay/files/fs_resize

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+resize the partition