recipes-core: Add initial bootup script to busybox

recipes-core/busybox/busybox-initcfg.bb

@@ -5,6 +5,7 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
 
 SRC_URI += " \
         file://S20load_modules.sh \
+        file://S99firstboot.sh \
         file://S49cgroups_mount.sh \
         file://ntp.conf \
         file://ntpd \
@@ -17,6 +18,7 @@ do_install_append () {
         install -m 0644 ${WORKDIR}/ntp.conf ${D}${sysconfdir}
         install -m 0755 ${WORKDIR}/ntpd ${D}${sysconfdir}/init.d/
         install -m 0755 ${WORKDIR}/S20load_modules.sh ${D}${sysconfdir}/rcS.d/
+        install -m 0755 ${WORKDIR}/S99firstboot.sh ${D}${sysconfdir}/rcS.d/
         install -m 0755 ${WORKDIR}/S49cgroups_mount.sh ${D}${sysconfdir}/rcS.d/
 
         cd ${D}${sysconfdir}/rcS.d/

recipes-core/busybox/files/S99firstboot.sh

@@ -0,0 +1,110 @@
+#!/bin/sh
+
+function generate_hostname() {
+    mac=$( ifconfig |grep eth0 | grep -io '[0-9a-f:]\{15\}[0-9a-f]\{2\}' )
+    mac=${mac//:}
+    nic=${mac:6}
+    nic=$(( 16#$nic ))
+    let length=32
+
+    for i in 4 3 2 1 0; do
+        let div=$length**$i
+        let idx=$nic/$div
+        let nic=$nic%$div
+
+        if [ $idx = 0 ] ; then
+            res=a
+        elif [ $idx = 1 ] ; then
+            res=b
+        elif [ $idx = 2 ] ; then
+            res=c
+        elif [ $idx = 3 ] ; then
+            res=d
+        elif [ $idx = 4 ] ; then
+            res=e
+        elif [ $idx = 5 ] ; then
+            res=f
+        elif [ $idx = 6 ] ; then
+            res=g
+        elif [ $idx = 7 ] ; then
+            res=h
+        elif [ $idx = 8 ] ; then
+            res=i
+        elif [ $idx = 9 ] ; then
+            res=j
+        elif [ $idx = 10 ] ; then
+            res=k
+        elif [ $idx = 11 ] ; then
+            res=m
+        elif [ $idx = 12 ] ; then
+            res=n
+        elif [ $idx = 13 ] ; then
+            res=p
+        elif [ $idx = 14 ] ; then
+            res=q
+        elif [ $idx = 15 ] ; then
+            res=r
+        elif [ $idx = 16 ] ; then
+            res=s
+        elif [ $idx = 17 ] ; then
+            res=t
+        elif [ $idx = 18 ] ; then
+            res=u
+        elif [ $idx = 19 ] ; then
+            res=v
+        elif [ $idx = 20 ] ; then
+            res=w
+        elif [ $idx = 21 ] ; then
+            res=x
+        elif [ $idx = 22 ] ; then
+            res=y
+        elif [ $idx = 23 ] ; then
+            res=z
+        elif [ $idx = 24 ] ; then
+            res=2
+        elif [ $idx = 25 ] ; then
+            res=3
+        elif [ $idx = 26 ] ; then
+            res=4
+        elif [ $idx = 27 ] ; then
+            res=5
+        elif [ $idx = 28 ] ; then
+            res=6
+        elif [ $idx = 29 ] ; then
+            res=7
+        elif [ $idx = 30 ] ; then
+            res=8
+        elif [ $idx = 31 ] ; then
+            res=8
+        fi
+        basex="$basex${res}"
+    done
+
+    old_hostname=$( cat /etc/hostname )
+    new_hostname=unknown-$basex
+
+    if [ $old_hostname = raspberrypi3-64 ]
+    then
+        new_hostname=rpi3-$basex
+    fi
+
+    if [ $old_hostname = raspberrypi4-64 ]
+    then
+        new_hostname=rpi3-$basex
+    fi
+
+    echo $new_hostname > /etc/hostname
+}
+
+FLAG="/var/local/firstboot.log"
+
+if [ ! -f $FLAG ]; then
+    echo "First boot"
+    touch $FLAG
+
+    generate_hostname
+    generate_avahi_service
+
+    
+    reboot
+fi