From 8b2715ff12b1d2a594d0aca02b3c42466ac06bed Mon Sep 17 00:00:00 2001
From: Recolic K <bensl@microsoft.com>
Date: Mon, 27 Sep 2021 16:55:05 +0800
Subject: [PATCH] add

---
 55-check-boot-mounted.hook    | 11 +++++++
 85-call-kernel-rename.hook    | 12 ++++++++
 README.md                     |  4 +++
 hook-check-bootdir-mounted.sh |  8 ++++++
 hook-kernel-rename.sh         | 54 +++++++++++++++++++++++++++++++++++
 5 files changed, 89 insertions(+)
 create mode 100644 55-check-boot-mounted.hook
 create mode 100644 85-call-kernel-rename.hook
 create mode 100755 hook-check-bootdir-mounted.sh
 create mode 100755 hook-kernel-rename.sh

diff --git a/55-check-boot-mounted.hook b/55-check-boot-mounted.hook
new file mode 100644
index 0000000..386ea18
--- /dev/null
+++ b/55-check-boot-mounted.hook
@@ -0,0 +1,11 @@
+[Trigger]
+Type = Path
+Operation = Install
+Operation = Upgrade
+Target = usr/lib/modules/*/vmlinuz
+
+[Action]
+Description = Checking if /boot is mounted...
+When = PreTransaction
+Exec = /usr/share/libalpm/scripts/hook-check-bootdir-mounted.sh
+
diff --git a/85-call-kernel-rename.hook b/85-call-kernel-rename.hook
new file mode 100644
index 0000000..3b26613
--- /dev/null
+++ b/85-call-kernel-rename.hook
@@ -0,0 +1,12 @@
+[Trigger]
+Type = Path
+Operation = Install
+Operation = Upgrade
+Target = usr/lib/modules/*/vmlinuz
+
+[Action]
+Description = Invoking hook-kernel-rename.sh to allow multiboot with different kparam...
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/hook-kernel-rename.sh
+NeedsTargets
+
diff --git a/README.md b/README.md
index 47f5b47..3daa82c 100644
--- a/README.md
+++ b/README.md
@@ -28,3 +28,7 @@ only supports grub
 
 only supports arch-based distributions. Tested on Arch Linux and Manjaro Linux. 
 
+## notes
+
+depends on: sed, bash, 
+
diff --git a/hook-check-bootdir-mounted.sh b/hook-check-bootdir-mounted.sh
new file mode 100755
index 0000000..452e894
--- /dev/null
+++ b/hook-check-bootdir-mounted.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# This is the pre-transaction hook, to force user to check if /boot is mounted. 
+# If there's no device mounted at /boot, generates an error. 
+
+mount | cut -d ' ' -f 3 | grep '^/boot$' > /dev/null
+exit $?
+
+
diff --git a/hook-kernel-rename.sh b/hook-kernel-rename.sh
new file mode 100755
index 0000000..3543b4d
--- /dev/null
+++ b/hook-kernel-rename.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+# post-transaction hook, to rename the installed kernel basing on hostname. 
+# This hook must run before mkinitcpio hook. 
+
+echo "Executing $0..." 1>&2
+
+function generate_mkinitcpio_preset () {
+    template='
+# mkinitcpio preset file for the "__PKGBASE__" package
+
+ALL_config="/etc/mkinitcpio.conf"
+ALL_kver="/boot/vmlinuz-__PKGBASE__"
+
+PRESETS=("default" "fallback")
+
+#default_config="/etc/mkinitcpio.conf"
+default_image="/boot/initramfs-__PKGBASE__.img"
+#default_options=""
+
+#fallback_config="/etc/mkinitcpio.conf"
+fallback_image="/boot/initramfs-__PKGBASE__-fallback.img"
+fallback_options="-S autodetect"
+'
+    new_pkgbase="$1"
+    echo -n "$template" | sed "s/__PKGBASE__/$new_pkgbase/g" > "/etc/mkinitcpio.d/${new_pkgbase}.preset"
+    # Maybe we should delete old_pkgbase.preset. I'm not sure if it would crash something on `mkinitcpio -P` (may called by mkinitcpio-install)
+    return $?
+}
+
+# Learned from /usr/share/libalpm/scripts/mkinitcpio-install
+while read -r line; do
+    [[ $line != */vmlinuz ]] && continue
+    if ! read -r pkgbase > /dev/null 2>&1 < "${line%/vmlinuz}/pkgbase"; then
+        # if the kernel has no pkgbase, we skip it
+        continue
+    fi
+
+    # Generates a filename for the kernel, and limit the length
+    new_pkgbase="${pkgbase}-$(hostname)"
+    new_pkgbase="${new_pkgbase:0:63}"
+
+    # Generate mkinitcpio presets
+    generate_mkinitcpio_preset "${new_pkgbase}" && 
+
+    # Rename vmlinuz
+    mv "/boot/vmlinuz-${pkgbase}" "/boot/vmlinuz-${new_pkgbase}" && 
+
+    # Overwrite /usr/lib/modules/.../pkgbase to make mkinitcpio-install use the new filename
+    echo "${new_pkgbase}" > "${line%/vmlinuz}/pkgbase" && 
+
+    echo "Renamed pkgbase from $pkgbase to $new_pkgbase successfully. " 1>&2 || 
+    exit $? # Crash on error
+done
+
-- 
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