done

etcnixos/util/untar.nix

@@ -0,0 +1,21 @@
+{
+  stdenv,
+  gnutar,
+  src,
+}:
+stdenv.mkDerivation {
+  pname = "untar";
+  version = "1.0";
+
+  inherit src;
+
+  buildInputs = [ gnutar ];
+
+  # input is a file, not a directory, skip unpackPhase
+  unpackPhase = "true";
+
+  installPhase = ''
+    mkdir -p $out
+    tar xf ${src} -C $out/
+  '';
+}