[PR PATCH] efibootmgr: have efibootmgr scripts behave more like grub with kernel…

[ddmgh <ddmgh@users.noreply.github.com>]

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There is a new pull request by ddmgh against master on the void-packages repository

https://github.com/ddmgh/void-packages efibootmgr-with-minor
https://github.com/void-linux/void-packages/pull/53001

efibootmgr: have efibootmgr scripts behave more like grub with kernel…
… minor version entries, and allow vkpurge to function properly here

#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)

efibootmgr.post-install only creates one boot entry for the latest kernel minor version of a major version; it removes the current boot entry and replaces it with the kernel that's been installed.  Additionally, efibootmgr.post-remove does nothing when called by vkpurge due to the "pkgname" that's passed to it.

This patch makes these scripts behave a little more like the related grub process in that you can easily boot from a previous kernel, as it simply adds a boot entry every time a kernel is installed.  In relation to this, efibootmgr.post-remove is also altered to allow vkpurge to do what one would expect, which is actually remove the related boot entry from EFI.

Please know this is my first commit on GitHub, so it's very possible something here is incorrect.

A patch file from https://github.com/void-linux/void-packages/pull/53001.patch is attached

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From 36d936aa0a97f9b63cee1609654a7e32a2ebd236 Mon Sep 17 00:00:00 2001
From: ddmgh <26882569+ddmgh@users.noreply.github.com>
Date: Mon, 11 Nov 2024 13:03:45 -0700
Subject: [PATCH] efibootmgr: have efibootmgr scripts behave more like grub
 with kernel minor version entries, and allow vkpurge to function properly
 here

---
 .../files/kernel.d/efibootmgr.post-install    | 25 +++----------------
 .../files/kernel.d/efibootmgr.post-remove     |  8 +++---
 srcpkgs/efibootmgr/template                   |  2 +-
 3 files changed, 7 insertions(+), 28 deletions(-)

diff --git a/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-install b/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-install
index adf523e7b1fae3..00698b5016b8e8 100644
--- a/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-install
+++ b/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-install
@@ -4,7 +4,7 @@
 #
 # Arguments passed to this script: $1 pkgname, $2 version.
 #
-PKGNAME="$1"
+# PKGNAME="$1"
 VERSION="$2"
 
 . "${ROOTDIR}/etc/default/efibootmgr-kernel-hook"
@@ -22,24 +22,5 @@ if [ "x${PART}" != x ]; then
 	args="$args -p $PART"
 fi
 
-# get major version, e.g. "4.8" for "linux4.8"
-major_version=$(echo $PKGNAME | cut -c 6-)
-
-# look for previous entry for this major kernel version
-existing_entry=$(efibootmgr | grep "Void Linux with kernel ${major_version}")
-
-# get the boot order
-# this is required because when in the next step the existing entry is removed,
-# it is also removed from the order so it needs to be restored later
-bootorder=$(efibootmgr |grep "BootOrder: " |cut -c 12-)
-
-# if existing, remove it
-if [ "$existing_entry" != "" ]; then
-  /etc/kernel.d/post-remove/50-efibootmgr $PKGNAME
-fi
-
-# create the new entry
-efibootmgr -qc $args -L "Void Linux with kernel ${major_version}" -l /vmlinuz-${VERSION} -u "${OPTIONS}"
-
-# restore the boot order
-efibootmgr -qo $bootorder
+# create new entry (new bootnum will be added to the start of bootorder)
+efibootmgr -qc $args -L "Void Linux with kernel ${VERSION}" -l /vmlinuz-${VERSION} -u "${OPTIONS}"
diff --git a/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-remove b/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-remove
index 54557e5cb7920c..1da7c9b7aba2ed 100644
--- a/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-remove
+++ b/srcpkgs/efibootmgr/files/kernel.d/efibootmgr.post-remove
@@ -4,18 +4,16 @@
 #
 # Arguments passed to this script: $1 pkgname, $2 version.
 #
-PKGNAME="$1"
+# PKGNAME="$1"
+VERSION="$2"
 
 . "${ROOTDIR}/etc/default/efibootmgr-kernel-hook"
 if [ "x${MODIFY_EFI_ENTRIES}" != x1 ]; then
 	exit 0
 fi
 
-# get major version, e.g. "4.8" for "linux4.8"
-major_version=$(echo $PKGNAME | cut -c 6-)
-
 # get hex number of the matching entry
-hexnum=$(efibootmgr | grep "Void Linux with kernel ${major_version}" | cut -c "5-8")
+hexnum=$(efibootmgr | grep "Void Linux with kernel ${VERSION}" | cut -c "5-8")
 
 # delete it
 [ "$hexnum" ] && efibootmgr -Bq -b $hexnum
diff --git a/srcpkgs/efibootmgr/template b/srcpkgs/efibootmgr/template
index 2f636914a56695..8db1f68fd3f633 100644
--- a/srcpkgs/efibootmgr/template
+++ b/srcpkgs/efibootmgr/template
@@ -1,7 +1,7 @@
 # Template file for 'efibootmgr'
 pkgname=efibootmgr
 version=18
-revision=1
+revision=2
 hostmakedepends="pkg-config"
 makedepends="libefivar-devel popt-devel"
 short_desc="Tool to modify UEFI Firmware Boot Manager Variables"