File os-prober-make-btrfsprogs-optional.patch of Package os-prober.24321

Index: os-prober-1.76/os-probes/common/50mounted-tests
===================================================================
--- os-prober-1.76.orig/os-probes/common/50mounted-tests
+++ os-prober-1.76/os-probes/common/50mounted-tests
@@ -151,11 +151,20 @@ if [ "$types" = btrfs ]; then
 		rmdir "$tmpmnt" || true
 		exit 1
 	fi
-	# besides regular subvols, get ro and snapshot so thet can be excluded
-        subvols=$(btrfs subvolume list -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
-        rosubvols=$(btrfs subvolume list -r -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
-        sssubvols=$(btrfs subvolume list -s -a "$tmpmnt" | cut -d ' ' -f 14 | sed -e s!^\<FS_TREE\>/!!)
-        defaultvol=$(btrfs subvolume get-default "$tmpmnt" | cut -d ' ' -f 9)
+
+	if type btrfs >/dev/null 2>&1; then
+		# besides regular subvols, get ro and snapshot so thet can be excluded
+		subvols=$(btrfs subvolume list -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
+		rosubvols=$(btrfs subvolume list -r -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
+		sssubvols=$(btrfs subvolume list -s -a "$tmpmnt" | cut -d ' ' -f 14 | sed -e s!^\<FS_TREE\>/!!)
+		defaultvol=$(btrfs subvolume get-default "$tmpmnt" | cut -d ' ' -f 9)
+	else
+		subvols=""
+		rosubvols=""
+		sssubvols=""
+		defaultvol=""
+	fi
+
         if ! umount "$tmpmnt"; then
             warn "failed to umount btrfs volume on $tmpmnt"
             rmdir "$tmpmnt" || true