protos: Compile protos for trunks daemon

The TPM device will need these protos to communicate TPM commands to the
Trunks daemon and receive TPM responses.

BUG=chromium:911799
TEST=cargo check
TEST=cargo check --features tpm
TEST=FEATURES=test emerge-nami crosvm
TEST=FEATURES=test USE=crosvm-tpm emerge-nami crosvm
TEST=local kokoro
CQ-DEPEND=CL:1553610
CQ-DEPEND=CL:1553971

Change-Id: I1a67a7b4a3714236b20a790068ca19129446f71c
Reviewed-on: https://chromium-review.googlesource.com/1554982
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: David Tolnay <dtolnay@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>

2 files changed, 57 insertions, 0 deletions

diff --git a/protos/tests/common/mod.rs b/protos/tests/common/mod.rs
new file mode 100644
index 0000000..a5aaf07
--- /dev/null
+++ b/protos/tests/common/mod.rs
@@ -0,0 +1,35 @@
+// Copyright 2019 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+use protobuf::Message;
+
+/// Asserts that a given protobuf message object can be serialized to bytes and
+/// read back into a value of the same type, preserving equality between the
+/// original object and the one read back.
+///
+/// This is helpful for confirming that proto files have been compiled
+/// successfully and are exposed as intended by the public API of the parent
+/// crate. It also lets us exercise the full set of methods we intend to use for
+/// building particular proto objects so that we notice breakage early in the
+/// event that a proto external to this repository would make a breaking change.
+///
+/// Note: assumes that the given `message` is not just `T::new` so that we can
+/// tell that deserialization has happened successfully.
+///
+/// # Example
+///
+/// ```ignore
+/// let mut request = SendCommandRequest::new();
+/// request.set_command(b"...".to_vec());
+/// test_round_trip(request);
+/// ```
+pub fn test_round_trip<T: Message + PartialEq>(message: T) {
+    let serialized = message.write_to_bytes().unwrap();
+
+    let mut back = T::new();
+    assert_ne!(message, back);
+
+    back.merge_from_bytes(&serialized).unwrap();
+    assert_eq!(message, back);
+}
diff --git a/protos/tests/trunks.rs b/protos/tests/trunks.rs
new file mode 100644
index 0000000..574c110
--- /dev/null
+++ b/protos/tests/trunks.rs
@@ -0,0 +1,22 @@
+// Copyright 2019 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+mod common;
+
+use crate::common::test_round_trip;
+use protos::trunks::{SendCommandRequest, SendCommandResponse};
+
+#[test]
+fn send_command_request() {
+    let mut request = SendCommandRequest::new();
+    request.set_command(b"...".to_vec());
+    test_round_trip(request);
+}
+
+#[test]
+fn send_command_response() {
+    let mut response = SendCommandResponse::new();
+    response.set_response(b"...".to_vec());
+    test_round_trip(response);
+}