From 3340dbc2ed92a0d9e58193d2d4082a588c1d84ca Mon Sep 17 00:00:00 2001
From: Giancarlo Razzolini <grazzolini@archlinux.org>
Date: Thu, 16 Jul 2020 11:08:11 -0300
Subject: libalpm/scripts/mkinitcpio-remove: Added the patch for the pacsave
 functionality

When removing kernels, detect if the preset was changes and save it as a .pacsave,
instead of removing it.
---
 libalpm/scripts/mkinitcpio-remove | 38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/libalpm/scripts/mkinitcpio-remove b/libalpm/scripts/mkinitcpio-remove
index 86838e4..17b4b31 100644
--- a/libalpm/scripts/mkinitcpio-remove
+++ b/libalpm/scripts/mkinitcpio-remove
@@ -2,6 +2,20 @@
 
 package=0
 
+process_preset() {
+    if [[ -n "${pkgbase}" && -e $preset ]]; then
+        if ! cmp $preset > /dev/null 2>&1 <(sed "s|%PKGBASE%|${pkgbase}|g" /usr/share/mkinitcpio/hook.preset); then
+            if [[ ! -e $preset.pacsave ]]; then
+                # save the preset as pacsave
+                mv $preset $preset.pacsave && return 0
+            fi
+        else
+            # remove the preset
+            rm $preset && return 0
+        fi
+    fi
+}
+
 while read -r line; do
     if [[ $line != */vmlinuz ]]; then
         # triggers when it's a change to usr/lib/initcpio/*
@@ -23,17 +37,25 @@ while read -r line; do
         # remove the installed kernel
         rm $kernel
     fi
-    if [[ -e $preset ]]; then
-        # remove the preset
-        rm $preset
+
+    process_preset "${pkgbase}" $preset
+
+    if [[ -e $initramfs ]]; then
+        # remove the main image
+        rm $initramfs
     fi
-    if [[ -e $initramfs && -e $fallback_initramfs ]]; then
-        # remove the images
-        rm $initramfs $fallback_initramfs
+    if [[ -e $fallback_initramfs ]]; then
+        # remove the fallback image
+        rm $fallback_initramfs
     fi
 done
 
 if (( package )) && compgen -G /etc/mkinitcpio.d/"*.preset" > /dev/null; then
-    # remove all presets
-    rm /etc/mkinitcpio.d/*.preset
+    shopt -s nullglob
+    for preset in /etc/mkinitcpio.d/*.preset; do
+        pkgbase=${preset##*/}
+        pkgbase=${pkgbase%.preset}
+        process_preset "${pkgbase}" $preset
+    done
+    shopt -u nullglob
 fi
-- 
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