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#!/bin/sh
PATH=/bin:/sbin
[ -e /proc/self/mounts ] \
|| (mkdir -p /proc && mount -t proc -o nosuid,noexec,nodev proc /proc)
grep -q '^sysfs /sys sysfs' /proc/self/mounts \
|| (mkdir -p /sys && mount -t sysfs -o nosuid,noexec,nodev sysfs /sys)
grep -q '^devtmpfs /dev devtmpfs' /proc/self/mounts \
|| (mkdir -p /dev && mount -t devtmpfs -o mode=755,noexec,nosuid,strictatime devtmpfs /dev)
grep -q '^tmpfs /run tmpfs' /proc/self/mounts \
|| (mkdir -p /run && mount -t tmpfs -o mode=755,noexec,nosuid,strictatime tmpfs /run)
if [ -e /erofs-root.img ]; then
_fs=erofs
_img=erofs-root.img
else
_fs=squashfs
_img=squashfs-root.img
fi
# Load required modules
modprobe loop
modprobe "$_fs"
modprobe overlay
# Mount the squash image
mount -t ramfs ramfs /squash
mkdir -p /squash/root /squash/overlay/upper /squash/overlay/work
mount -t "$_fs" -o ro,loop /"$_img" /squash/root
# Setup new root overlay
mkdir /newroot
mount -t overlay overlay -o lowerdir=/squash/root,upperdir=/squash/overlay/upper,workdir=/squash/overlay/work/ /newroot/
# Move all mount points to new root to prepare chroot
mount --move /squash /newroot/squash
# Jump to new root and clean setup files
SYSTEMD_IN_INITRD=lenient exec switch_root /newroot /init
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