dasharo-deploy & btg_key_validator: reword error messages

Signed-off-by: Michał Iwanicki <michal.iwanicki@3mdeb.com>

Author: m-iwanicki

scripts/btg_key_validator

@@ -62,10 +62,10 @@ parse_args "$@"
 
 if [ -z "$expected_hash" ]; then
   board_config
-  error_check "Failed to download board configuration"
+  error_check "Failed to download board configuration."
   if [ -z "$INTEL_BTG_HASH" ]; then
-    error_exit "Cannot determine expected key hash.
-Make sure your platform firmware supports Intel BootGuard"
+    error_exit "Platform configuration is missing expected key hash.
+The most likely reason is that there is no fusing binary for your platform."
   fi
   expected_hash="$INTEL_BTG_HASH"
 fi

scripts/dasharo-deploy.sh

@@ -1450,6 +1450,9 @@ fuse_workflow() {
     echo "No release with fusing support is available for your platform."
     exit "${CANCEL}"
   fi
+  if [ -z "$INTEL_BTG_HASH" ]; then
+    error_exit "Platform config is missing hash of the key used to sign firmware"
+  fi
 
   BIOS_LINK="${EOM_LINK_COMM_CAP}"
   BIOS_HASH_LINK="${EOM_HASH_LINK_COMM_CAP}"
@@ -1471,7 +1474,8 @@ fuse_workflow() {
   download_bios
   verify_artifacts bios
   btg_key_validator --file "$BIOS_UPDATE_FILE" --key-hash "$INTEL_BTG_HASH"
-  error_check "Firmware Intel BootGuard signature check failed. Aborting..."
+  error_check "Firmware Intel BootGuard signature check failed. Aborting...
+Platform has not been fused and no changes were made."
   # Ask user for confirmation:
   display_warning