experiment: Leave initramfs

Added experiment on booting past initramfs. It uses Makefile to build initramfs.

1 files changed, 23 insertions, 0 deletions

diff --git a/experiments/03_20251130_leaving_initramfs/init b/experiments/03_20251130_leaving_initramfs/init
new file mode 100644
index 0000000..27fcc61
--- /dev/null
+++ b/experiments/03_20251130_leaving_initramfs/init
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+echo "creating new root..."
+busybox mkdir /new_root
+busybox mount -t tmpfs tmpfs /new_root
+
+busybox cp -r bin etc init lib lib64 sbin usr var /new_root
+
+busybox mkdir /new_root/dev
+busybox mkdir /new_root/proc
+busybox mkdir /new_root/sys
+
+echo "mounting special filesystems..."
+busybox mount -t devtmpfs 	udev  	/new_root/dev
+busybox mount -t proc     	proc  	/new_root/proc
+busybox mount -t sysfs    	sysfs 	/new_root/sys
+
+echo "the cake is a lie!" > /new_root/cake
+
+echo "it's time to try 'switch_root' command and enter new_root"
+echo "look for /cake to verify it worked"
+
+exec busybox switch_root /new_root /bin/busybox sh