1 files changed, 34 insertions, 0 deletions
diff --git a/modules.d/99squash/init-squash.sh b/modules.d/99squash/init-squash.sh
new file mode 100755
index 0000000..59769f6
--- /dev/null
+++ b/modules.d/99squash/init-squash.sh
@@ -0,0 +1,34 @@
+#!/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