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https://github.com/tumillanino/miasma-os.git
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90 lines
4.1 KiB
Bash
90 lines
4.1 KiB
Bash
#!/usr/bin/env bash
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# Replaces the stock Fedora kernel with the Bazzite kernel.
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# The Bazzite kernel ships sched-ext (SCX) support and gaming/realtime
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# optimizations, making it well-suited for low-latency audio workloads.
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#
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# Based on the solarpowered project kernel install approach:
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# https://github.com/solar-powered/solarpowered
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set -ouex pipefail
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OS_VERSION=$(rpm -E %fedora)
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VER=$(basename "$(curl -Ls -o /dev/null -w '%{url_effective}' https://github.com/bazzite-org/kernel-bazzite/releases/latest)")
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# Verify we got a valid version string
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if [[ -z "$VER" ]]; then
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echo "ERROR: Failed to determine latest bazzite kernel version" >&2
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exit 1
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fi
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echo "Bazzite kernel version: ${VER}"
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# Disable kernel-install hooks so they don't trigger inside the container
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# build environment. The initramfs will be generated explicitly below.
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mkdir -p /usr/lib/kernel/install.d
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pushd /usr/lib/kernel/install.d
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printf '%s\n' '#!/bin/sh' 'exit 0' >05-rpmostree.install
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printf '%s\n' '#!/bin/sh' 'exit 0' >50-dracut.install
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chmod +x 05-rpmostree.install 50-dracut.install
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popd
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# Erase stock Fedora kernel RPMs from the package database (matches Bazzite's approach)
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for pkg in kernel kernel-core kernel-modules kernel-modules-core kernel-modules-extra kernel-tools-libs kernel-tools; do
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rpm --erase "$pkg" --nodeps || true
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done
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# Remove ALL existing kernel module directories.
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rm -rf /usr/lib/modules
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# Create /boot/grub2 so grub2 RPM scriptlets don't fail in the container
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# build environment. It gets removed by the rm -rf /boot/* below.
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mkdir -p /boot/grub2
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echo "Installing Bazzite kernel ${VER}..."
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dnf5 install -y \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-common-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-core-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-devel-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-devel-matched-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-akmods-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-core-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-extra-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-extra-matched-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-modules-internal-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-tools-$VER.fc$OS_VERSION.x86_64.rpm \
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https://github.com/bazzite-org/kernel-bazzite/releases/download/$VER/kernel-tools-libs-$VER.fc$OS_VERSION.x86_64.rpm
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# Identify the newly installed Bazzite kernel version
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NEW_KVER=$(ls /usr/lib/modules | head -n1)
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# Ensure vmlinuz is at the path expected by rpm-ostree and bootc for boot
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# entry generation.
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if [ ! -f "/usr/lib/modules/${NEW_KVER}/vmlinuz" ]; then
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if [ -f "/boot/vmlinuz-${NEW_KVER}" ]; then
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cp "/boot/vmlinuz-${NEW_KVER}" "/usr/lib/modules/${NEW_KVER}/vmlinuz"
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else
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echo "ERROR: vmlinuz not found for kernel ${NEW_KVER}" >&2
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exit 1
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fi
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fi
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# Rebuild kernel module dependency map before generating initramfs.
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depmod -a "${NEW_KVER}"
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# Generate the initramfs inside the container image so that rpm-ostree and
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# bootc can use it directly at deploy time.
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dracut \
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--no-hostonly \
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--kver "${NEW_KVER}" \
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--reproducible \
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--zstd \
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-v \
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--add ostree \
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--force \
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"/usr/lib/modules/${NEW_KVER}/initramfs.img"
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# Atomic images manage /boot via the bootloader layer; clear any kernel
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# files the RPM dropped there.
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rm -rf /boot/*
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