switching from cachy to bazzite kernel

files/scripts/bazzite-kernel.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+# Replaces the stock Fedora kernel with the Bazzite kernel.
+# The Bazzite kernel ships sched-ext (SCX) support and gaming/realtime
+# optimizations, making it well-suited for low-latency audio workloads.
+#
+# Based on the solarpowered project kernel install approach:
+# https://github.com/solar-powered/solarpowered
+
+set -ouex pipefail
+
+OS_VERSION=$(rpm -E %fedora)
+VER=$(basename $(curl -Ls -o /dev/null -w %{url_effective} https://github.com/bazzite-org/kernel-bazzite/releases/latest))
+
+# Disable kernel-install hooks so they don't trigger inside the container
+# build environment. The initramfs will be generated explicitly below.
+pushd /usr/lib/kernel/install.d
+printf '%s\n' '#!/bin/sh' 'exit 0' >05-rpmostree.install
+printf '%s\n' '#!/bin/sh' 'exit 0' >50-dracut.install
+chmod +x 05-rpmostree.install 50-dracut.install
+popd
+
+# Erase stock Fedora kernel RPMs from the package database
+for pkg in kernel kernel-core kernel-modules kernel-modules-core; do
+  rpm --erase "$pkg" --nodeps || true
+done
+
+# Remove ALL existing kernel module directories.
+for KVER in $(ls /usr/lib/modules 2>/dev/null); do
+  rm -rf "/usr/lib/modules/$KVER"
+done
+
+echo 'Installing Bazzite kernel...'
+dnf install -y \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-common-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-core-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-devel-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-devel-matched-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-akmods-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-core-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-extra-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-extra-matched-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-internal-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-tools-$VER.fc$OS_VERSION.x86_64.rpm \
+    https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-tools-libs-$VER.fc$OS_VERSION.x86_64.rpm
+
+# Identify the newly installed Bazzite kernel version
+NEW_KVER=$(ls /usr/lib/modules | head -n1)
+
+# Ensure vmlinuz is at the path expected by rpm-ostree and bootc for boot
+# entry generation.
+if [ ! -f "/usr/lib/modules/${NEW_KVER}/vmlinuz" ]; then
+  if [ -f "/boot/vmlinuz-${NEW_KVER}" ]; then
+    cp "/boot/vmlinuz-${NEW_KVER}" "/usr/lib/modules/${NEW_KVER}/vmlinuz"
+  else
+    echo "ERROR: vmlinuz not found for kernel ${NEW_KVER}" >&2
+    exit 1
+  fi
+fi
+
+# Rebuild kernel module dependency map before generating initramfs.
+depmod -a "${NEW_KVER}"
+
+# Generate the initramfs inside the container image so that rpm-ostree and
+# bootc can use it directly at deploy time.
+dracut \
+  --reproducible \
+  --no-hostonly \
+  --add "ostree" \
+  --filesystems "btrfs" \
+  --add-drivers "btrfs" \
+  --force \
+  "/usr/lib/modules/${NEW_KVER}/initramfs.img" \
+  "${NEW_KVER}"
+
+# Atomic images manage /boot via the bootloader layer; clear any kernel
+# files the RPM dropped there.
+rm -rf /boot/*