envoy: switch default WASM runtime to wasmtime (#435633)

pkgs/by-name/en/envoy/bazel_nix.BUILD.bazel

···
 load("@bazel_tools//tools/sh:sh_toolchain.bzl", "sh_toolchain")
 load("@rules_rust//rust:toolchain.bzl", "rust_toolchain")
+load("@rules_rust//rust:defs.bzl", "rust_stdlib_filegroup")
 
 toolchains = {
     "x86_64": "x86_64-unknown-linux-gnu",
     "aarch64": "aarch64-unknown-linux-gnu",
 }
 
-exports_files(["cargo", "rustdoc", "ruststd", "rustc"])
+exports_files(["cargo", "rustdoc", "rustc"])
+
+[
+    rust_stdlib_filegroup(
+        name = "rust_nix_" + k + "_stdlib",
+        srcs = glob(
+            [
+                "rustcroot/lib/rustlib/" + v + "/lib/**",
+            ],
+            allow_empty=True,
+        ),
+    )
+    for k, v in toolchains.items()
+]
 
 [
     rust_toolchain(
···
         exec_triple = v,
         cargo = ":cargo",
         rust_doc = ":rustdoc",
-        rust_std = ":ruststd",
+        rust_std = ":rust_nix_" + k + "_stdlib",
         rustc = ":rustc",
         stdlib_linkflags = ["-ldl", "-lpthread"],
         staticlib_ext = ".a",

pkgs/by-name/en/envoy/package.nix

···
   gnutar,
   gnugrep,
   envoy,
+  git,
 
   # v8 (upstream default), wavm, wamr, wasmtime, disabled
-  wasmRuntime ? "wamr",
+  wasmRuntime ? "wasmtime",
+
+  # Allows overriding the deps hash used for building - you will likely need to
+  # set this if you have changed the 'wasmRuntime' setting.
+  depsHash ? null,
 }:
 
 let
···
   };
 
   # these need to be updated for any changes to fetchAttrs
-  depsHash =
-    {
-      x86_64-linux = "sha256-E6yUSd00ngmjaMds+9UVZLtcYhzeS8F9eSIkC1mZSps=";
-      aarch64-linux = "sha256-ivboOrV/uORKVHRL3685aopcElGvzsxgVcUmYsBwzXY=";
-    }
-    .${stdenv.system} or (throw "unsupported system ${stdenv.system}");
+  depsHash' =
+    if depsHash != null then
+      depsHash
+    else
+      {
+        x86_64-linux = "sha256-t4Xv4UGYW5YU0kmv+1rdf2JvM1BYQyNWdtpz6Cdmxm4=";
+        aarch64-linux = "sha256-aIBnNGzc0hTdlTgRyJ7eLnWvHqZ5ywhqOM+mHfH3/18=";
+      }
+      .${stdenv.system} or (throw "unsupported system ${stdenv.system}");
 
   python3 = python312;
 
···
     ln -sf "${cargo}/bin/cargo" bazel/nix/cargo
     ln -sf "${rustc}/bin/rustc" bazel/nix/rustc
     ln -sf "${rustc}/bin/rustdoc" bazel/nix/rustdoc
-    ln -sf "${rustPlatform.rustLibSrc}" bazel/nix/ruststd
+    ln -sf "${rustc.unwrapped}" bazel/nix/rustcroot
     substituteInPlace bazel/dependency_imports.bzl \
       --replace-fail 'crate_universe_dependencies()' 'crate_universe_dependencies(rust_toolchain_cargo_template="@@//bazel/nix:cargo", rust_toolchain_rustc_template="@@//bazel/nix:rustc")' \
       --replace-fail 'crates_repository(' 'crates_repository(rust_toolchain_cargo_template="@@//bazel/nix:cargo", rust_toolchain_rustc_template="@@//bazel/nix:rustc",'
···
     ninja
     patchelf
     cacert
+    git
   ];
 
   buildInputs = [ linuxHeaders ];
 
   fetchAttrs = {
-    sha256 = depsHash;
+    sha256 = depsHash';
     env.CARGO_BAZEL_REPIN = true;
     dontUseCmakeConfigure = true;
     dontUseGnConfigure = true;
···
     "--linkopt=-Wl,-z,noexecstack"
     "--config=gcc"
     "--verbose_failures"
+    "--incompatible_enable_cc_toolchain_resolution=true"
 
     # Force use of system Java.
     "--extra_toolchains=@local_jdk//:all"