From f4a0d9b4a7dfde51324ccba9c62c8f6549cdfe12 Mon Sep 17 00:00:00 2001
From: Eric Curtin <ecurtin@redhat.com>
Date: Wed, 12 Jun 2024 15:45:20 +0100
Subject: [PATCH] /proc/mounts is a clearly defined format

This is a more solid check for if "/" is "btrfs".

Signed-off-by: Eric Curtin <ecurtin@redhat.com>
---
 scripts/guess_rootfs.sh | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/scripts/guess_rootfs.sh b/scripts/guess_rootfs.sh
index cc61e26..c3b1550 100755
--- a/scripts/guess_rootfs.sh
+++ b/scripts/guess_rootfs.sh
@@ -12,11 +12,12 @@ set_lvm () {
 }
 
 check_btrfs () {
-    fs=$(lsblk -f | grep "$(awk '/ \/ / {print $1}' /etc/fstab | grep -oP '(?<=UUID=)[^ ]*')" | awk '{print $2}')
-    if [ "$fs" = "btrfs" ]
-    then
-	    set_btrfs
-    fi
+    while read -r device mountpoint fstype options dump pass; do
+        if [ "$mountpoint" = "/" ] && [ "$fstype" = "btrfs"]; then
+            set_btrfs
+            break
+        fi
+    done < /proc/mounts
 }
 
 set_btrfs () {