1 files changed, 8 insertions, 0 deletions
diff --git a/pkgs/lib/types.nix b/pkgs/lib/types.nix
index 1cb1185b8bb..6ddac61d91b 100644
--- a/pkgs/lib/types.nix
+++ b/pkgs/lib/types.nix
@@ -68,6 +68,14 @@ rec {
       merge = lib.concatStrings;
     };
 
+    # Like ‘string’, but add newlines between every value.  Useful for
+    # configuration file contents.
+    lines = mkOptionType {
+      name = "string";
+      check = lib.traceValIfNot builtins.isString;
+      merge = lib.concatStringsSep "\n";
+    };
+
     envVar = mkOptionType {
       name = "environment variable";
       inherit (string) check;