Raise an error only when `require_master_key` is specified

To prevent errors from being raise in environments where credentials
is unnecessary.

Context: https://github.com/rails/rails/issues/31283#issuecomment-348801489

Fixes #31283

1 files changed, 10 insertions, 2 deletions

diff --git a/railties/lib/rails/commands/encrypted/encrypted_command.rb b/railties/lib/rails/commands/encrypted/encrypted_command.rb
index 898094f1a4..912c453f09 100644
--- a/railties/lib/rails/commands/encrypted/encrypted_command.rb
+++ b/railties/lib/rails/commands/encrypted/encrypted_command.rb
@@ -37,9 +37,9 @@ module Rails
 
       def show(file_path)
         require_application_and_environment!
+        encrypted = Rails.application.encrypted(file_path, key_path: options[:key])
 
-        say Rails.application.encrypted(file_path, key_path: options[:key]).read.presence ||
-          "File '#{file_path}' does not exist. Use bin/rails encrypted:edit #{file_path} to change that."
+        say encrypted.read.presence || missing_encrypted_message(key: encrypted.key, key_path: options[:key], file_path: file_path)
       end
 
       private
@@ -72,6 +72,14 @@ module Rails
 
           Rails::Generators::EncryptedFileGenerator.new
         end
+
+        def missing_encrypted_message(key:, key_path:, file_path:)
+          if key.nil?
+            "Missing '#{key_path}' to decrypt data. See bin/rails encrypted:help"
+          else
+            "File '#{file_path}' does not exist. Use bin/rails encrypted:edit #{file_path} to change that."
+          end
+        end
     end
   end
 end