Re: Improve consistency of relative paths in kernel hooks

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

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New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/24079#issuecomment-669887298

Comment:
Simplified refind, no complicated logic, what do you think?
For your convenience, that patch can be taken from here: https://github.com/void-linux/void-packages/pull/23688/commits/6fac00c4dadc63454ebb09a424478aec703e86d0
```sh
#!/bin/sh
#
# Kernel hook for refind.
#
# Arguments passed to this script: $1 pkgname, $2 version.
#
PKGNAME="$1"
VERSION="$2"

. "${ROOTDIR}/etc/default/refind-kernel-hook.conf"
if [ "z$UPDATE_REFIND_CONF" != "z1" ]; then
	exit 0;
fi

# Default refind.conf
: "${REFIND_CONF:=boot/EFI/refind/refind.conf}"
REFIND_CONF=${REFIND_CONF#/}
[ -n "${REFIND_CONF}" ] || exit 0

# refind-install only supports those two paths
refind_dir=
case "$REFIND_CONF" in
*/EFI/[Bb][Oo][Oo][Tt]/refind.conf)
	refind_dir="/EFI/BOOT" ;;
*/EFI/refind/refind.conf)
	refind_dir="/EFI/refind" ;;
*)
	echo >&2 "unsupported \$REFIND_CONF: $REFIND_CONF"
	exit 1 ;;
esac

tmpfile=$(mktemp /tmp/refind.XXXXXXX)

zversion=$(echo "$VERSION" | sed 's/[.]/[.]/g')

(
	cat <<EOF
menuentry "Void Linux $VERSION" {
	icon     $refind_dir/icons/os_void.png
	volume   "Void Linux"
	loader   /vmlinuz-$VERSION
	initrd   /initramfs-$VERSION.img
	options  "$OPTIONS"
}
EOF
	# Clean itself if this is force reconfigure
	sed "/^menuentry \"Void Linux $zversion\" [{]\$/,/[}]/d" <"$REFIND_CONF"
) >"$tmpfile"

mv "$tmpfile" "$REFIND_CONF"

exit 0
```

---
EDIT: `cat` first, `sed` later, keep old conf layout.