1 files changed, 19 insertions, 10 deletions
diff --git a/pkgs/build-support/fetchurl/boot.nix b/pkgs/build-support/fetchurl/boot.nix
index 8f8c78b7a454..4aa76094a843 100644
--- a/pkgs/build-support/fetchurl/boot.nix
+++ b/pkgs/build-support/fetchurl/boot.nix
@@ -1,12 +1,15 @@
-let mirrors = import ./mirrors.nix; in
+let
+  mirrors = import ./mirrors.nix;
+in
 
 { system }:
 
-{ url ? builtins.head urls
-, urls ? []
-, sha256 ? ""
-, hash ? ""
-, name ? baseNameOf (toString url)
+{
+  url ? builtins.head urls,
+  urls ? [ ],
+  sha256 ? "",
+  hash ? "",
+  name ? baseNameOf (toString url),
 }:
 
 # assert exactly one hash is set
@@ -14,12 +17,18 @@ assert hash != "" || sha256 != "";
 assert hash != "" -> sha256 == "";
 
 import <nix/fetchurl.nix> {
-  inherit system hash sha256 name;
+  inherit
+    system
+    hash
+    sha256
+    name
+    ;
 
   url =
     # Handle mirror:// URIs. Since <nix/fetchurl.nix> currently
     # supports only one URI, use the first listed mirror.
-    let m = builtins.match "mirror://([a-z]+)/(.*)" url; in
-    if m == null then url
-    else builtins.head (mirrors.${builtins.elemAt m 0}) + (builtins.elemAt m 1);
+    let
+      m = builtins.match "mirror://([a-z]+)/(.*)" url;
+    in
+    if m == null then url else builtins.head (mirrors.${builtins.elemAt m 0}) + (builtins.elemAt m 1);
 }