From 047fe2fe23a902c777e10ba37534b8a1b7072a1e Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Sat, 12 Jun 2021 17:28:00 +0200
Subject: [PATCH] emptyFile, emptyDirectory: init

---
 pkgs/build-support/trivial-builders.nix | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index 0bf67d21b3be..219f808403cc 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -571,6 +571,22 @@ rec {
       installPhase = "cp -R ./ $out";
     };
 
+  /* An immutable file in the store with a length of 0 bytes. */
+  emptyFile = runCommand "empty-file" {
+    outputHashAlgo = "sha256";
+    outputHashMode = "recursive";
+    outputHash = "0ip26j2h11n1kgkz36rl4akv694yz65hr72q4kv4b3lxcbi65b3p";
+    preferLocalBuild = true;
+  } "touch $out";
+
+  /* An immutable empty directory in the store. */
+  emptyDirectory = runCommand "empty-directory" {
+    outputHashAlgo = "sha256";
+    outputHashMode = "recursive";
+    outputHash = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5";
+    preferLocalBuild = true;
+  } "mkdir $out";
+
   /* Checks the command output contains the specified version
    *
    * Although simplistic, this test assures that the main program