#!/bin/sh

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PATH=/bin:/sbin

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[ -e /proc/self/mounts ] \

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|| (mkdir -p /proc && mount -t proc -o nosuid,noexec,nodev proc /proc)

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grep -q '^sysfs /sys sysfs' /proc/self/mounts \

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|| (mkdir -p /sys && mount -t sysfs -o nosuid,noexec,nodev sysfs /sys)

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grep -q '^devtmpfs /dev devtmpfs' /proc/self/mounts \

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|| (mkdir -p /dev && mount -t devtmpfs -o mode=755,noexec,nosuid,strictatime devtmpfs /dev)

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grep -q '^tmpfs /run tmpfs' /proc/self/mounts \

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|| (mkdir -p /run && mount -t tmpfs -o mode=755,noexec,nosuid,strictatime tmpfs /run)

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# Load required modules

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modprobe loop

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modprobe squashfs

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modprobe overlay

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# Mount the squash image

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mount -t ramfs ramfs /squash

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mkdir -p /squash/root /squash/overlay/upper /squash/overlay/work

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mount -t squashfs -o ro,loop /squash-root.img /squash/root

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# Setup new root overlay

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mkdir /newroot

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mount -t overlay overlay -o lowerdir=/squash/root,upperdir=/squash/overlay/upper,workdir=/squash/overlay/work/ /newroot/

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# Move all mount points to new root to prepare chroot

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mount --move /squash /newroot/squash

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# Jump to new root and clean setup files

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SYSTEMD_IN_INITRD=lenient exec switch_root /newroot /init

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