From 9b3a34a754a12cfa73921bf2a4f8aea32cdb5fba Mon Sep 17 00:00:00 2001
From: Mateusz Sylwestrzak <401237-mattz7@users.noreply.gitlab.com>
Date: Sat, 24 Feb 2024 01:53:23 +0100
Subject: [PATCH] refind: account for btrfs setups when generating manual
 stanzas

---
 srcpkgs/refind/files/kernel.post-install | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/srcpkgs/refind/files/kernel.post-install b/srcpkgs/refind/files/kernel.post-install
index fd18f9c45ffe07..3b416721222f3e 100755
--- a/srcpkgs/refind/files/kernel.post-install
+++ b/srcpkgs/refind/files/kernel.post-install
@@ -22,12 +22,27 @@ tmpfile=$(mktemp /tmp/refind.XXXXXXX)
 
 zversion=$(echo "$VERSION" | sed 's/[.]/[.]/g')
 
+# establish ESP mounting point
+efipath=$(echo $REFIND_CONF | sed 's/\/EFI.*$//')
+if [ $efipath = "/boot" ]; then # mounting ESP to /boot with vmlinuz- and intramfs- stored on the EFI partition
+    efiprefix=""
+else
+    efiprefix="\/$(dirname $efipath)" # mounting ESP to /boot/efi or another path
+fi
+rootfslabel=$(blkid -s LABEL -o value $(df -P / | awk 'NR==2 {print $1}'))
+
+# account for the BTRFS setups including subvolumes
+if df -T / | awk 'NR==2 && $2 == "btrfs" {print "Root filesystem is Btrfs"}'; then
+    rootfssubvol=$(btrfs subvolume show / | head -n1)
+    echo "Btrfs subvol for ROOT is: $rootfssubvol"
+fi
+
 zentry=$(cat <<EOF
 menuentry "Void Linux $VERSION" {
-	volume   "Void Linux"
-	loader   /vmlinuz-$VERSION
-	initrd   /initramfs-$VERSION.img
-	options  "$OPTIONS"
+        volume   "$rootfslabel"
+        loader   ${rootfssubvol}${efiprefix}/vmlinuz-$VERSION
+        initrd   ${rootfssubvol}${efiprefix}/initramfs-$VERSION.img
+        options  "$OPTIONS"
 }
 EOF
 )