Merge pull request 'Use only oxalica/rust-overlay toolchain and not nixpkgs' (#710) from oxalica-toolchain-only into main

Reviewed-on: Deuxfleurs/garage#710

nix/compile.nix

@@ -19,30 +19,9 @@ let
       overlays = [ cargo2nixOverlay ];
     };
 
-  /* Cargo2nix is built for rustOverlay which installs Rust from Mozilla releases.
+  toolchainOptions = {
-     This is fine for 64-bit platforms, but for 32-bit platforms, we need our own Rust
-     to avoid incompatibilities with time_t between different versions of musl
-     (>= 1.2.0 shipped by NixOS, < 1.2.0 with which rustc was built), which lead to compilation breakage.
-     So we want a Rust release that is bound to our Nix repository to avoid these problems.
-     See here for more info: https://musl.libc.org/time64.html
-     Because Cargo2nix does not support the Rust environment shipped by NixOS,
-     we emulate the structure of the Rust object created by rustOverlay.
-     In practise, rustOverlay ships rustc+cargo in a single derivation while
-     NixOS ships them in separate ones. We reunite them with symlinkJoin.
-  */
-  toolchainOptions = if target == null || target == "x86_64-unknown-linux-musl"
-  || target == "aarch64-unknown-linux-musl" then {
     rustVersion = "1.73.0";
     extraRustComponents = [ "clippy" ];
-  } else {
-    rustToolchain = pkgs.symlinkJoin {
-      name = "rust-static-toolchain-${target}";
-      paths = [
-        pkgs.rustPlatform.rust.cargo
-        pkgs.rustPlatform.rust.rustc
-        # clippy not needed, it only runs on amd64
-      ];
-    };
   };
 
   buildEnv = (drv:

nix/toolchain.nix

@@ -3,29 +3,9 @@
 with import ./common.nix;
 
 let
-  platforms = [
-    #"x86_64-unknown-linux-musl"
-    "i686-unknown-linux-musl"
-    #"aarch64-unknown-linux-musl"
-    "armv6l-unknown-linux-musleabihf"
-  ];
-  pkgsList = builtins.map (target:
-    import pkgsSrc {
-      inherit system;
-      crossSystem = {
-        config = target;
-        isStatic = true;
-      };
-      overlays = [ cargo2nixOverlay ];
-    }) platforms;
   pkgsHost = import pkgsSrc { };
-  lib = pkgsHost.lib;
   kaniko = (import ./kaniko.nix) pkgsHost;
   winscp = (import ./winscp.nix) pkgsHost;
   manifestTool = (import ./manifest-tool.nix) pkgsHost;
-in lib.flatten (builtins.map (pkgs: [
+in [ kaniko winscp manifestTool ]
-  pkgs.rustPlatform.rust.rustc
-  pkgs.rustPlatform.rust.cargo
-  pkgs.buildPackages.stdenv.cc
-]) pkgsList) ++ [ kaniko winscp manifestTool ]