1 files changed, 10 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/build-support/fetchzip/default.nix b/nixpkgs/pkgs/build-support/fetchzip/default.nix
index cde4d4f579f4..b174c252fc0e 100644
--- a/nixpkgs/pkgs/build-support/fetchzip/default.nix
+++ b/nixpkgs/pkgs/build-support/fetchzip/default.nix
@@ -13,10 +13,17 @@
 , urls ? []
 , extraPostFetch ? ""
 , name ? "source"
+, # Allows to set the extension for the intermediate downloaded
+  # file. This can be used as a hint for the unpackCmdHooks to select
+  # an appropriate unpacking tool.
+  extension ? null
 , ... } @ args:
 
 (fetchurl (let
-  basename = baseNameOf (if url != "" then url else builtins.head urls);
+  tmpFilename =
+    if extension != null
+    then "download.${extension}"
+    else baseNameOf (if url != "" then url else builtins.head urls);
 in {
   inherit name;
 
@@ -30,7 +37,7 @@ in {
       mkdir "$unpackDir"
       cd "$unpackDir"
 
-      renamed="$TMPDIR/${basename}"
+      renamed="$TMPDIR/${tmpFilename}"
       mv "$downloadedFile" "$renamed"
       unpackFile "$renamed"
     ''
@@ -56,7 +63,7 @@ in {
     + ''
       chmod 755 "$out"
     '';
-} // removeAttrs args [ "stripRoot" "extraPostFetch" ])).overrideAttrs (x: {
+} // removeAttrs args [ "stripRoot" "extraPostFetch" "extension" ])).overrideAttrs (x: {
   # Hackety-hack: we actually need unzip hooks, too
   nativeBuildInputs = x.nativeBuildInputs ++ [ unzip ];
 })