basic (INSECURE!) init system

createimg.sh

@@ -16,7 +16,7 @@ echo "PARTITION_START=${PARTITION_START}"
 
 #create room for a  partition
 ls -al iglunix.img  -h
-dd if=/dev/zero bs=1 count=0 seek=2G of=iglunix.img
+dd if=/dev/zero bs=1 count=0 seek=20G of=iglunix.img
 ls -al iglunix.img  -h
 
 echo "n
@@ -68,6 +68,11 @@ cp /etc/vconsole.conf ${ROOT}/etc/vconsole.conf
 #TODO: this is a systemd file,
 #      use udev/kbd
 
+echo "Copying init.d files& inittab"
+mkdir ${ROOT}/etc/init.d/
+cp -r /iglunix/init/init.d ${ROOT}/etc/
+cp /iglunix/init/inittab ${ROOT}/etc/
+
 echo "Unmounting & closing loopback"
 
 umount ${ROOT}

geninitrd.sh

@@ -57,7 +57,8 @@ done
 
 
 echo "Starting switch_root"
-exec switch_root /mnt /bin/sh
+#exec switch_root /mnt /etc/init.d/rcS
+exec switch_root /mnt /sbin/init
 
 EOF
 

init/init.d/net

@@ -0,0 +1,4 @@
+#!/bin/sh
+ip link set lo up
+ip link set eth0 up
+udhcpc -i eth0 -x hostname:$(cat /etc/hostname)

init/init.d/rcS

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+mount -t tmpfs tmpfs /tmp
+
+echo 0 > /proc/sys/kernel/printk
+
+ln -s /proc/self/fs/0 /dev/stdin
+ln -s /proc/self/fs/1 /dev/stdout
+ln -s /proc/self/fs/2 /dev/stderr
+
+mkdir -p /dev/pts
+mount -t devpts devpts /dev/pts
+
+hostname -F /etc/hostname
+
+mdev -s
+mdev -d
+
+mount -a
+
+/etc/init.d/net
+/etc/init.d/sshd
+
+#See https://github.com/landley/toybox/issues/111
+echo 0 9999999 > /proc/sys/net/ipv4/ping_group_range
+
+/bin/sh

init/init.d/sshd

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/usr/sbin/sshd -R -s

init/inittab

@@ -0,0 +1,8 @@
+::sysinit:/etc/init.d/rcS
+::ctrlaltdel:/sbin/reboot
+::shutdown:/sbin/swapoff -a
+::shutdown:/bin/umount -a -r
+::restart:/sbin/init
+ttyS0::askfirst:-/bin/sh
+::respawn:/sbin/getty 38400 tty1
+::respawn:/sbin/getty 38400 tty2