From 34105077c777b0d2c5c69f39921f376b84ce1443 Mon Sep 17 00:00:00 2001
From: Philip J Freeman <elektron@halo.nu>
Date: Sat, 31 May 2025 12:34:14 -0700
Subject: Deploying a demo amd64 debian-based OS via ostree

This is a prototype outline for building and deploying a debian based OS
with ostree.  For purposes of demonstration, the OS runs from a bootable
USB device on a UEFI capable amd64 machine.  Once a USB device is
created and booted, the OS can be updated using a simple shell script.

<https://ostreedev.github.io/ostree/>
<https://www.nin.wiki/Halo_numbers>
---
 hooks/build-os-post/20-ostree-kernel-mangle | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 hooks/build-os-post/20-ostree-kernel-mangle

(limited to 'hooks/build-os-post/20-ostree-kernel-mangle')

diff --git a/hooks/build-os-post/20-ostree-kernel-mangle b/hooks/build-os-post/20-ostree-kernel-mangle
new file mode 100755
index 0000000..1e51905
--- /dev/null
+++ b/hooks/build-os-post/20-ostree-kernel-mangle
@@ -0,0 +1,22 @@
+#!/bin/bash -xe
+set -o pipefail
+
+# Kernel mangling
+
+kver=$(ls -1 "${root:?}"/usr/lib/modules)
+
+# move kernel out of /boot into /usr/lib/modules/
+mv "${root:?}"/boot/vmlinuz-"$kver" "${root:?}"/usr/lib/modules/"$kver"/vmlinuz
+mv "${root:?}"/boot/initrd.img-"$kver" "${root:?}"/usr/lib/modules/"$kver"/initramfs.img
+mv "${root:?}"/boot/config-"$kver" "${root:?}"/usr/lib/modules/"$kver"/config
+mv "${root:?}"/boot/System.map-"$kver" "${root:?}"/usr/lib/modules/"$kver"/System.map
+
+# remove kernel symlinks from root
+rm "${root:?}"/vmlinuz* "${root:?}"/initrd.*
+
+khash=$(sha256sum "${root:?}"/usr/lib/modules/"$kver"/vmlinuz | awk '{print $1}')
+
+# add ostree style kernel links from /usr/lib/ostree-boot
+mkdir -p "${root:?}"/usr/lib/ostree-boot
+ln -s /usr/lib/modules/"$kver"/vmlinuz "${root:?}"/usr/lib/ostree-boot/vmlinuz-"$khash"
+ln -s /usr/lib/modules/"$kver"/initramfs.img "${root:?}"/usr/lib/ostree-boot/initramfs-"$khash"
-- 
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