Use the vendored prost everywhere.

This also introduces a `ProtoOptions` struct much like `CodegenOptions`,
so adding new options in the future is easier.

Note: this also needs to whitelist the ZLib license, as the dependency
graph now includes [`tinyvec`](https://github.com/Lokathor/tinyvec).

deny.toml

@@ -19,6 +19,7 @@ allow = [
   "ISC",
   "MIT",
   "OpenSSL",
+  "Zlib",
 ]
 
 [[licenses.clarify]]

examples/Cargo.toml

@@ -51,3 +51,7 @@ trusted_information_retrieval_client = { path = "trusted_information_retrieval/c
 # Third party.
 expect = { path = "../third_party/expect" }
 roughenough = { path = "../third_party/roughenough" }
+prost = { path = "../third_party/prost" }
+prost-build = { path = "../third_party/prost/prost-build" }
+prost-derive = { path = "../third_party/prost/prost-derive" }
+prost-types = { path = "../third_party/prost/prost-types" }

oak/server/Cargo.toml

@@ -14,3 +14,7 @@ oak_runtime = { path = "rust/oak_runtime" }
 oak_utils = { path = "../../oak_utils" }
 # Third party.
 roughenough = { path = "../../third_party/roughenough" }
+prost = { path = "../../third_party/prost" }
+prost-derive = { path = "../../third_party/prost/prost-derive" }
+prost-build = { path = "../../third_party/prost/prost-build" }
+prost-types = { path = "../../third_party/prost/prost-types" }

oak_abi/Cargo.toml

@@ -15,3 +15,8 @@ prost-types = "*"
 [build-dependencies]
 oak_utils = { path = "../oak_utils" }
 prost-build = "*"
+
+[patch.crates-io]
+prost-build = { path = "../third_party/prost/prost-build" }
+prost = { path = "../third_party/prost" }
+prost-types = { path = "../third_party/prost/prost-types" }

oak_abi/build.rs

@@ -14,10 +14,10 @@
 // limitations under the License.
 //
 
+// Keep clippy from complaining about a needless call to `Default::default()`.
+#[allow(clippy::needless_update)]
 fn main() {
-    // Exclude generation of service code, as it would require a reference to the Oak SDK to
-    // compile.
-    oak_utils::compile_protos_without_services(
+    oak_utils::compile_protos_with_options(
         &[
             "../oak/proto/application.proto",
             "../oak/proto/grpc_encap.proto",
@@ -29,5 +29,11 @@ fn main() {
             "../third_party/google/rpc/status.proto",
         ],
         &[".."],
+        oak_utils::ProtoOptions {
+            // Exclude generation of service code, as it would require a reference to the Oak SDK to
+            // compile.
+            generate_services: false,
+            ..Default::default()
+        },
     );
 }

oak_utils/Cargo.toml

@@ -21,3 +21,7 @@ tonic-build = { version = "*", default-features = false, features = [
   "prost",
   "transport"
 ] }
+
+[patch.crates-io]
+prost-build = { path = "../third_party/prost/prost-build" }
+prost = { path = "../third_party/prost" }