fetchurl: check that url is a string

Otherwise we (may) get a hard to debug issue in the tarball job, e.g. see the grandparent commit.
2021-04-01 22:29:39 +02:00 · 2021-04-01 22:29:39 +02:00 · e5ec487840
commit e5ec487840
parent d601532dfc
1 changed files with 3 additions and 1 deletions
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@ -104,7 +104,9 @@ let
    if urls != [] && url == "" then
      (if lib.isList urls then urls
       else throw "`urls` is not a list")
-    else if urls == [] && url != "" then [url]
+    else if urls == [] && url != "" then
+      (if lib.isString url then [url]
+       else throw "`url` is not a string")
    else throw "fetchurl requires either `url` or `urls` to be set";

  hash_ =