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EDIT :: init-squash.sh

#!/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) # Load required modules modprobe loop modprobe squashfs modprobe overlay # Mount the squash image mount -t ramfs ramfs /squash mkdir -p /squash/root /squash/overlay/upper /squash/overlay/work mount -t squashfs -o ro,loop /squash-root.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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