From 460c475a8d59a5e5d40829f5ab2e90ef03631a04 Mon Sep 17 00:00:00 2001
From: dalto <dalto@fastmail.com>
Date: Fri, 19 Feb 2021 16:03:45 -0600
Subject: [PATCH] Initial commit

---
 .../install.d/50-mkinitcpio-fallback.install  |  12 ++
 .../install.d/90-loaderentry-fallback.install | 124 ++++++++++++++++++
 .../libalpm/hooks/90-kernel-install.hook      |  11 ++
 .../share/libalpm/hooks/90-kernel-remove.hook |  10 ++
 src/usr/share/libalpm/scripts/kernel-install  |   8 ++
 5 files changed, 165 insertions(+)
 create mode 100755 src/usr/lib/kernel/install.d/50-mkinitcpio-fallback.install
 create mode 100755 src/usr/lib/kernel/install.d/90-loaderentry-fallback.install
 create mode 100644 src/usr/share/libalpm/hooks/90-kernel-install.hook
 create mode 100644 src/usr/share/libalpm/hooks/90-kernel-remove.hook
 create mode 100755 src/usr/share/libalpm/scripts/kernel-install

diff --git a/src/usr/lib/kernel/install.d/50-mkinitcpio-fallback.install b/src/usr/lib/kernel/install.d/50-mkinitcpio-fallback.install
new file mode 100755
index 0000000..5e95b1d
--- /dev/null
+++ b/src/usr/lib/kernel/install.d/50-mkinitcpio-fallback.install
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+case $1 in
+    add)
+        mkinitcpio -S autodetect -k "$2" -g "$3"/initrd-fallback
+        ;;
+    remove)
+        rm -f -- "$3"/initrd-fallback
+        ;;
+esac
+
+# vim: set ft=sh ts=4 sw=4 et:
diff --git a/src/usr/lib/kernel/install.d/90-loaderentry-fallback.install b/src/usr/lib/kernel/install.d/90-loaderentry-fallback.install
new file mode 100755
index 0000000..109f4c5
--- /dev/null
+++ b/src/usr/lib/kernel/install.d/90-loaderentry-fallback.install
@@ -0,0 +1,124 @@
+#!/usr/bin/env bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+COMMAND="$1"
+KERNEL_VERSION="$2"
+ENTRY_DIR_ABS="$3"
+KERNEL_IMAGE="$4"
+INITRD_OPTIONS_START="5"
+
+if ! [[ $KERNEL_INSTALL_MACHINE_ID ]]; then
+    exit 0
+fi
+
+if ! [[ -d "$ENTRY_DIR_ABS" ]]; then
+    exit 0
+fi
+
+MACHINE_ID=$KERNEL_INSTALL_MACHINE_ID
+
+BOOT_ROOT=${ENTRY_DIR_ABS%/$MACHINE_ID/$KERNEL_VERSION}
+BOOT_MNT=$(stat -c %m $BOOT_ROOT)
+ENTRY_DIR=${ENTRY_DIR_ABS#$BOOT_MNT}
+
+if [[ $COMMAND == remove ]]; then
+    rm -f "$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION-fallback.conf"
+    rm -f "$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION-fallback+"*".conf"
+    exit 0
+fi
+
+if ! [[ $COMMAND == add ]]; then
+    exit 1
+fi
+
+if ! [[ $KERNEL_IMAGE ]]; then
+    exit 1
+fi
+
+if [[ -f /etc/os-release ]]; then
+    . /etc/os-release
+elif [[ -f /usr/lib/os-release ]]; then
+    . /usr/lib/os-release
+fi
+
+if ! [[ $PRETTY_NAME ]]; then
+    PRETTY_NAME="Linux $KERNEL_VERSION"
+fi
+
+if [[ -f /etc/kernel/cmdline ]]; then
+    read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
+elif [[ -f /usr/lib/kernel/cmdline ]]; then
+    read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
+else
+    declare -a BOOT_OPTIONS
+
+    read -r -d '' -a line < /proc/cmdline
+    for i in "${line[@]}"; do
+        [[ "${i#initrd=*}" != "$i" ]] && continue
+        [[ "${i#BOOT_IMAGE=*}" != "$i" ]] && continue
+        BOOT_OPTIONS+=("$i")
+    done
+fi
+
+if [[ -f /etc/kernel/tries ]]; then
+    read -r TRIES </etc/kernel/tries
+    if ! [[ "$TRIES" =~ ^[0-9]+$ ]] ; then
+        echo "/etc/kernel/tries does not contain an integer." >&2
+        exit 1
+    fi
+    LOADER_ENTRY="$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION-fallback+$TRIES.conf"
+else
+    LOADER_ENTRY="$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION-fallback.conf"
+fi
+
+cp "$KERNEL_IMAGE" "$ENTRY_DIR_ABS/linux" &&
+   chown root:root "$ENTRY_DIR_ABS/linux" &&
+   chmod 0644 "$ENTRY_DIR_ABS/linux" || {
+    echo "Could not copy '$KERNEL_IMAGE to '$ENTRY_DIR_ABS/linux'." >&2
+    exit 1
+}
+
+INITRD_OPTIONS=( "${@:${INITRD_OPTIONS_START}}" )
+
+for initrd in "${INITRD_OPTIONS[@]}"; do
+    if [[ -f "${initrd}" ]]; then
+        initrd_basename="$(basename ${initrd})"
+        [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
+            echo "Installing $ENTRY_DIR_ABS/${initrd_basename}"
+        cp "${initrd}" "$ENTRY_DIR_ABS/${initrd_basename}" &&
+            chown root:root "$ENTRY_DIR_ABS/${initrd_basename}" &&
+            chmod 0644 "$ENTRY_DIR_ABS/${initrd_basename}" || {
+             echo "Could not copy '${initrd}' to '$ENTRY_DIR_ABS/${initrd_basename}'." >&2
+             exit 1
+        }
+    fi
+done
+
+# If no initrd option is supplied, fall back to "initrd" which is
+# the name used by dracut when generating it in its kernel-install hook
+[[ ${#INITRD_OPTIONS[@]} == 0 ]] && INITRD_OPTIONS=( initrd-fallback )
+
+mkdir -p "${LOADER_ENTRY%/*}" || {
+    echo "Could not create loader entry directory '${LOADER_ENTRY%/*}'." >&2
+    exit 1
+}
+
+[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
+    echo "Creating $LOADER_ENTRY"
+{
+    echo "title      $PRETTY_NAME"
+    echo "version    $KERNEL_VERSION-fallback"
+    echo "machine-id $MACHINE_ID"
+    echo "options    ${BOOT_OPTIONS[*]}"
+    echo "linux      $ENTRY_DIR/linux"
+    for initrd in "${INITRD_OPTIONS[@]}"; do
+        [[ -f $ENTRY_DIR_ABS/$(basename ${initrd}) ]] && \
+            echo "initrd     $ENTRY_DIR/$(basename ${initrd})"
+    done
+    :
+} > "$LOADER_ENTRY" || {
+    echo "Could not create loader entry '$LOADER_ENTRY'." >&2
+    exit 1
+}
+exit 0
diff --git a/src/usr/share/libalpm/hooks/90-kernel-install.hook b/src/usr/share/libalpm/hooks/90-kernel-install.hook
new file mode 100644
index 0000000..88874f1
--- /dev/null
+++ b/src/usr/share/libalpm/hooks/90-kernel-install.hook
@@ -0,0 +1,11 @@
+[Trigger]
+Type = Path
+Operation = Install
+Operation = Upgrade
+Target = usr/lib/modules/*/vmlinuz
+
+[Action]
+Description = Installing kernel...
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/kernel-install add
+NeedsTargets
diff --git a/src/usr/share/libalpm/hooks/90-kernel-remove.hook b/src/usr/share/libalpm/hooks/90-kernel-remove.hook
new file mode 100644
index 0000000..6ec9ef0
--- /dev/null
+++ b/src/usr/share/libalpm/hooks/90-kernel-remove.hook
@@ -0,0 +1,10 @@
+[Trigger]
+Type = Path
+Operation = Remove
+Target = usr/lib/modules/*/vmlinuz
+
+[Action]
+Description = Removing kernel...
+When = PreTransaction
+Exec = /usr/share/libalpm/scripts/kernel-install remove
+NeedsTargets
diff --git a/src/usr/share/libalpm/scripts/kernel-install b/src/usr/share/libalpm/scripts/kernel-install
new file mode 100755
index 0000000..d3929de
--- /dev/null
+++ b/src/usr/share/libalpm/scripts/kernel-install
@@ -0,0 +1,8 @@
+#!/bin/bash -e
+
+while read -r line; do
+    version=$(basename "${line%/vmlinuz}")
+    echo ":: Installing kernel $version"
+
+    kernel-install $1 "${version}" "${line}"
+done