From 6ed9cff05fb1015fe50951c93430052004d22b01 Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@redhat.com>
Date: Fri, 21 May 2021 12:19:32 +0200
Subject: [PATCH] fix(dracut-functions): get_maj_min without
 get_maj_min_cache_file set

If `get_maj_min_cache_file` is unset `get_maj_min()` would error out.

Fix it to work without a cache file set.

(cherry picked from commit a277a5fc7acc0a9e8d853f09671495f9d27645c1)

Cherry-picked from: a277a5fc7acc0a9e8d853f09671495f9d27645c1
Resolves: #1957622
---
 dracut-functions.sh | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/dracut-functions.sh b/dracut-functions.sh
index a221967c..eb2ce748 100755
--- a/dracut-functions.sh
+++ b/dracut-functions.sh
@@ -200,13 +200,20 @@ get_fs_env() {
 # 8:2
 get_maj_min() {
     local _majmin
-    out="$(grep -m1 -oP "^$1 \K\S+$" "${get_maj_min_cache_file:?}")"
-    if [ -z "$out" ]; then
+    local _out
+
+    if [[ $get_maj_min_cache_file ]]; then
+        _out="$(grep -m1 -oP "^$1 \K\S+$" "$get_maj_min_cache_file")"
+    fi
+
+    if ! [[ "$_out" ]]; then
     _majmin="$(stat -L -c '%t:%T' "$1" 2>/dev/null)"
         out="$(printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))")"
-        echo "$1 $out" >> "${get_maj_min_cache_file:?}"
+        if [[ $get_maj_min_cache_file ]]; then
+            echo "$1 $_out" >> "$get_maj_min_cache_file"
+    fi
     fi
-    echo -n "$out"
+    echo -n "$_out"
 }
 
 # get_devpath_block <device>