Apply upstream patch for temp dir usage with LUKS

Resolves: rhbz2228779

rear-luks-key-bz2228779.patch

@@ -0,0 +1,25 @@
+commit 2aa7b47354bdf5863071c8b479d29c99aad05ecb
+Author: Johannes Meixner <jsmeix@suse.com>
+Date:   Fri Jul 24 13:02:45 2020 +0200
+
+    Update 240_reassign_luks_keyfiles.sh
+    
+    Use ReaR specific TMP_DIR (not TMPDIR or hardcoded /tmp)
+
+diff --git a/usr/share/rear/finalize/GNU/Linux/240_reassign_luks_keyfiles.sh b/usr/share/rear/finalize/GNU/Linux/240_reassign_luks_keyfiles.sh
+index d989c3fb..358f3950 100644
+--- a/usr/share/rear/finalize/GNU/Linux/240_reassign_luks_keyfiles.sh
++++ b/usr/share/rear/finalize/GNU/Linux/240_reassign_luks_keyfiles.sh
+@@ -24,9 +24,9 @@ awk '
+ while read target_name source_device original_keyfile; do
+     Log "Re-assigning keyfile $original_keyfile to LUKS device $target_name ($source_device)"
+ 
+-    # The scheme for generating a temporary keyfile path must be the same here and in the 'layout/prepare' stage.
+-    temp_keyfile="${TMPDIR:-/tmp}/LUKS-keyfile-$target_name"
+-    [ -f "$temp_keyfile" ] || BugError "temporary keyfile $temp_keyfile not found"
++    # The scheme for generating a temporary keyfile path must be the same here and in the 'layout/prepare' stage:
++    temp_keyfile="$TMP_DIR/LUKS-keyfile-$target_name"
++    test -f "$temp_keyfile" || BugError "temporary LUKS keyfile $temp_keyfile not found"
+ 
+     target_keyfile="$TARGET_FS_ROOT/$original_keyfile"
+ 

rear.spec

@@ -47,6 +47,7 @@ Patch56: s390-no-clobber-disks.patch
 Patch57: rear-bz2188593-nbu-systemd.patch
 Patch58: rear-device-shrinking-bz2223895.patch
 Patch59: rear-usb-uefi-part-size-bz2228402.patch
+Patch60: rear-luks-key-bz2228779.patch
 
 # rear contains only bash scripts plus documentation so that on first glance it could be "BuildArch: noarch"
 # but actually it is not "noarch" because it only works on those architectures that are explicitly supported.