Initial commit

6 files changed, 132 insertions, 0 deletions

diff --git a/.SRCINFO b/.SRCINFO
new file mode 100644
index 000000000000..d7d7dd97b46b
--- /dev/null
+++ b/.SRCINFO
@@ -0,0 +1,18 @@
+pkgbase = patch-kernel-pacman-hook
+	pkgdesc = Pacman hook to automatically build the linux package from ABS with additional patches upon updates.
+	pkgver = 1
+	pkgrel = 1
+	install = patch-kernel-pacman-hook.install
+	arch = any
+	license = MIT
+	depends = asp
+	backup = etc/pacman.d/patch-kernel.conf
+	source = build-patched-kernel
+	source = build-patched-kernel.hook
+	source = patch-kernel.conf
+	sha512sums = e2164f6511c179847aa9fda2372f38c59035ed333c5f0b589bb353756a6dd4abbf951e4b96e0d7d43948c0d323ca2daea968de8f2574a127d29ff6d84a0939a1
+	sha512sums = 134eb0cfdaedb4d677a3cc92e5d9fd2f5a63a657ffefd5c217fa662d06b1ba6cb47e29915c2763e34afcefbfeba7e61aa932b7f6258c639ac1ff4b9fd9b17df5
+	sha512sums = a8debf2dfac793689eb411cf31833eea9d8f20bd5af493f312f15d02082d77a2f025fa1cef047091cb95aae00f09a999ce4524c8696de10fcdb73678a8379025
+
+pkgname = patch-kernel-pacman-hook
+
diff --git a/PKGBUILD b/PKGBUILD
new file mode 100644
index 000000000000..418fd26ac543
--- /dev/null
+++ b/PKGBUILD
@@ -0,0 +1,26 @@
+# Maintainer: Daniel Kirchner <daniel@ekpyron.org>
+
+pkgname=patch-kernel-pacman-hook
+pkgver=1
+pkgrel=1
+pkgdesc="Pacman hook to automatically build the linux package from ABS with additional patches upon updates."
+arch=("any")
+depends=('asp')
+license=('MIT')
+backup=('etc/pacman.d/patch-kernel.conf')
+install="patch-kernel-pacman-hook.install"
+source=('build-patched-kernel'
+        'build-patched-kernel.hook'
+        'patch-kernel.conf')
+sha512sums=('e2164f6511c179847aa9fda2372f38c59035ed333c5f0b589bb353756a6dd4abbf951e4b96e0d7d43948c0d323ca2daea968de8f2574a127d29ff6d84a0939a1'
+            '134eb0cfdaedb4d677a3cc92e5d9fd2f5a63a657ffefd5c217fa662d06b1ba6cb47e29915c2763e34afcefbfeba7e61aa932b7f6258c639ac1ff4b9fd9b17df5'
+            'a8debf2dfac793689eb411cf31833eea9d8f20bd5af493f312f15d02082d77a2f025fa1cef047091cb95aae00f09a999ce4524c8696de10fcdb73678a8379025')
+
+package() {
+	install -m755 -d "${pkgdir}/usr/share/libalpm/scripts"
+	install -m755 -d "${pkgdir}/usr/share/libalpm/hooks"
+	install -m755 -d "${pkgdir}/etc/pacman.d"
+	install -m755 "${srcdir}/build-patched-kernel" "${pkgdir}/usr/share/libalpm/scripts/build-patched-kernel"
+	install -m644 "${srcdir}/build-patched-kernel.hook" "${pkgdir}/usr/share/libalpm/hooks/build-patched-kernel.hook"
+	install -m644 "${srcdir}/patch-kernel.conf" "${pkgdir}/etc/pacman.d/patch-kernel.conf"
+}
diff --git a/build-patched-kernel b/build-patched-kernel
new file mode 100755
index 000000000000..23a39e3daa3f
--- /dev/null
+++ b/build-patched-kernel
@@ -0,0 +1,56 @@
+#!/bin/bash -e
+
+CONFIG=/etc/pacman.d/patch-kernel.conf
+
+source "${CONFIG}"
+
+if [ "${KERNEL_PATCHES}" == "" ]; then
+	# Nothing to do.
+	exit 0
+fi
+
+if [ "${MAKEPKG_USER}" == "" ]; then
+	echo "You need to specify a non-root user to build the patched kernel in ${CONFIG}."
+	exit 1
+fi
+
+if [ "${BUILD_DIRECTORY}" == "" ]; then
+	echo "You need to specify a build directory for building the patched kernel in ${CONFIG}."
+	exit 1
+fi
+
+if [ "$EUID" -ne 0 ]; then
+	echo "This script is expected to be run as pacman hook as root user."
+fi
+
+
+CONFIG="${CONFIG}" su -s /bin/bash -w CONFIG - "${MAKEPKG_USER}" -c '
+set -e
+source "${CONFIG}"
+
+cd "${BUILD_DIRECTORY}"
+
+asp update linux &> /dev/null
+asp -f export core/linux &> /dev/null
+cd linux
+
+for patch in ${KERNEL_PATCHES}; do
+sed -i -e "/source=(/a\\" -e "\"${patch}\"" PKGBUILD
+sed -i -e "s/sha256sums=(/sha256sums=(\"SKIP\" /" PKGBUILD
+done
+
+echo "Building patched kernel. This may take a while. Logs will be written to \"${MAKEPKG_LOG:-/tmp/makepkg_linux.log}\"."
+if ! PKGEXT=".pkg.tar.zst" makepkg ${MAKEPKG_OPTIONS} &> "${MAKEPKG_LOG:-/tmp/makepkg_linux.log}"; then
+	echo "Failed to build patched kernel. Aborting."
+	exit 1
+fi
+
+echo "Build successful. Applied patches according to makepkg log:"
+grep -oP "Applying patch \K.*(?=\.\.\.)" "${MAKEPKG_LOG:-/tmp/makepkg_linux.log}"
+
+'
+
+echo "Overwriting pacman cache:"
+
+source "${BUILD_DIRECTORY}"/linux/PKGBUILD
+cp -v "${BUILD_DIRECTORY}"/linux/linux-${pkgver}-${pkgrel}-x86_64.pkg.tar.zst ${PACMAN_CACHE_DIR:-/var/cache/pacman/pkg/}
diff --git a/build-patched-kernel.hook b/build-patched-kernel.hook
new file mode 100644
index 000000000000..b09bead70bfe
--- /dev/null
+++ b/build-patched-kernel.hook
@@ -0,0 +1,10 @@
+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Package
+Target = linux
+[Action]
+Description = Patch linux kernel
+When = PreTransaction
+Exec = /usr/share/libalpm/scripts/build-patched-kernel
+AbortOnFail
diff --git a/patch-kernel-pacman-hook.install b/patch-kernel-pacman-hook.install
new file mode 100644
index 000000000000..97d0105e29eb
--- /dev/null
+++ b/patch-kernel-pacman-hook.install
@@ -0,0 +1,8 @@
+post_install() {
+	if [ -f "/etc/pacman.d/patch-kernel.conf.pacsave" ]; then
+		mv -v "/etc/pacman.d/patch-kernel.conf.pacsave" "/etc/pacman.d/patch-kernel.conf"
+	else
+		echo "To enable automatic kernel patching you have to customize /etc/pacman.d/patch-kernel.conf."
+		echo -e "\033[0;33mpatch-kernel-pacman-hook is highly experimental, use at your own risk.\033[0m"
+	fi
+}
diff --git a/patch-kernel.conf b/patch-kernel.conf
new file mode 100644
index 000000000000..7739c973846e
--- /dev/null
+++ b/patch-kernel.conf
@@ -0,0 +1,14 @@
+# Specify a non-root user used to build the patched kernel.
+MAKEPKG_USER=""
+
+# Specify a directory for building. The hook will use asp to create subdirectory called "linux" for the patched build.
+BUILD_DIRECTORY=""
+
+# A list of paths to kernel patches to apply to the kernel.
+KERNEL_PATCHES=""
+
+# An optional list of arguments to be passed to makepkg.
+# MAKEPKG_OPTIONS="--clean --skippgpcheck"
+
+# The pacman cache dir used to store the created package. Modify this, if you don't use the default.
+# PACMAN_CACHE_DIR=/var/cache/pacman/pkg