rust: Allow setting cargoSha256 to null.

Setting the hash to null is a convenient way to bypass the hash check
while developing. It looks like the ability to do this was inadvertently
removed while adding vendor directory support.

This still checks that the user is explicitly setting the value but
allows null as a valid option.

1 files changed, 2 insertions, 2 deletions

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 83ef146de5f8..f407ba25bf85 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -4,7 +4,7 @@ let
     inherit stdenv cacert git rust cargo-vendor;
   };
 in
-{ name, cargoSha256 ? null
+{ name, cargoSha256 ? "unset"
 , src ? null
 , srcs ? null
 , sourceRoot ? null
@@ -17,7 +17,7 @@ in
 , cargoVendorDir ? null
 , ... } @ args:
 
-assert cargoVendorDir == null -> cargoSha256 != null;
+assert cargoVendorDir == null -> cargoSha256 != "unset";
 
 let
   lib = stdenv.lib;