update sources.nix

bytes-zone · May 25, 2021 · b510cd0 · b510cd0
1 parent e748c5f
commit b510cd0
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/nix/sources.nix b/nix/sources.nix
@@ -98,7 +98,10 @@ let
       saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
       ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
     in
-      if ersatz == "" then drv else ersatz;
+      if ersatz == "" then drv else
+        # this turns the string into an actual Nix path (for both absolute and
+        # relative paths)
+        if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
 
   # Ports of functions for older nix versions