New comment by prez on void-packages repository

https://github.com/void-linux/void-packages/pull/42667#issuecomment-1493424924

Comment:
I've been testing this on my system (x86_64 glibc) - systemd-boot works well. 
The hook could use some logic to check whether the configured kernel is newer than the current default one (always replacing the default with a potentially older kernel isn't expected behaviour, I think).
And here's a suggestion for a post-remove hook:

```sh
#!/bin/sh
#
# Kernel post-remove hook for systemd-boot.
#
# Arguments passed to this script: $1 pkgname, $2 version.
#
PKGNAME="$1"
VERSION="$2"

. "$ROOTDIR/etc/default/systemd-boot"

if [ "$SYSTEMD_BOOT_DISABLE" ]; then
	exit 0
fi

boot="$ROOTDIR/boot"
entries="$boot/loader/entries"
name="void-$VERSION"
entry="$entries/$name.conf"
loader="$boot/loader/loader.conf"

[ -r "$loader" ] || exit 0

rm -f "$entry"

if grep -q "^default ${name}" "$loader" 2>/dev/null; then
	# Replace removed default entry with another
	alternative="$(ls -r "$entries" | head -n 1)"
	[ -n "$alternative" ] || exit 0
	sed -i "s/default.*/default ${alternative%.conf}/" "$loader"
fi
```