Throw an error if NIXPKGS_OVERLAYS is invalid and improve documentation.

2017-01-16 01:17:33 +01:00
parent 6a83c315ec
commit f9da1fa957
2 changed files with 5 additions and 3 deletions
@@ -31,7 +31,9 @@
        let content = readDir dir; in
        map (n: import "${dir}/${n}") (sort lessThan (attrNames content));
    in
-      if dirCheck dirEnv then overlays dirEnv
+      if dirEnv != "" then
+        if dirCheck dirEnv then overlays dirEnv
+        else throw "The environment variable NIXPKGS_OVERLAYS does not name a valid directory."
      else if dirCheck dirHome then overlays dirHome
      else []