update cargo-xbuild

default.nix

@@ -1,7 +1,7 @@
 let
   pkgs = import <nixpkgs> { overlays = [ (import ./nix/mozilla-overlay.nix) ]; };
   rustPlatform = (import ./nix/rust-platform.nix { inherit pkgs; });
-  cargo-xbuild = (pkgs.cargo-xbuild.overrideAttrs(oa: { patches = oa.patches ++ [ ./xbuild_writable_lockfile.diff ]; } ));
+  cargo-xbuild = pkgs.callPackage ./nix/cargo-xbuild.nix {};
   cargoSha256Experiments = "0d2v6n6a73vhxm6yq60mvv9pxxxah88kzryb0w32i0ddhfj4rrs7";
   cargoSha256SZL = "0ghj5bbix8417wdismwmxkykvdknikwkvg7sjcjmrywnqk4ka6lg";
   build-crate = name: crate: features: cargoSha256:

nix/cargo-xbuild.nix

@@ -0,0 +1,22 @@
+{ lib, fetchFromGitHub, rustPlatform }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "cargo-xbuild";
+  version = "0.6.5";
+
+  src = fetchFromGitHub {
+    owner = "rust-osdev";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "18djvygq9v8rmfchvi2hfj0i6fhn36m716vqndqnj56fiqviwxvf";
+  };
+
+  cargoSha256 = "13sj9j9kl6js75h9xq0yidxy63vixxm9q3f8jil6ymarml5wkhx8";
+
+  meta = with lib; {
+    description = "Automatically cross-compiles the sysroot crates core, compiler_builtins, and alloc";
+    homepage = "https://github.com/rust-osdev/cargo-xbuild";
+    license = with licenses; [ mit asl20 ];
+    maintainers = with maintainers; [ johntitor xrelkd ];
+  };
+}

xbuild_writable_lockfile.diff

@@ -1,27 +0,0 @@
-diff --git a/src/sysroot.rs b/src/sysroot.rs
-index 1f3c8d1..422d3d0 100644
---- a/src/sysroot.rs
-+++ b/src/sysroot.rs
-@@ -85,10 +85,20 @@ fn build_crate(
-     }
- 
-     util::write(&td.join("Cargo.toml"), &stoml)?;
--    fs::copy(lockfile, &td.join("Cargo.lock")).chain_err(||
-+    let dst_file = td.join("Cargo.lock");
-+    fs::copy(lockfile, &dst_file).chain_err(||
-         format!("failed to copy Cargo.lock from `{}` to `{}`",
--            lockfile.display(), &td.join("Cargo.lock").display())
-+            lockfile.display(), &dst_file.display())
-     )?;
-+    let mut perms = fs::metadata(&dst_file).chain_err(||
-+        format!("failed to retrieve permissions for `{}`",
-+            dst_file.display())
-+    )?.permissions();
-+    perms.set_readonly(false);
-+    fs::set_permissions(&dst_file, perms).chain_err(||
-+        format!("failed to update permissions for `{}`",
-+            dst_file.display())
-+    );
-     util::mkdir(&td.join("src"))?;
-     util::write(&td.join("src/lib.rs"), "")?;
-