Add cosmo ignition target (#445)

Updated per RFD 142

Author: labbott

gateway-messages/src/lib.rs

@@ -69,7 +69,7 @@ pub const HF_PAGE_SIZE: usize = 256;
 /// for more detail and discussion.
 pub mod version {
     pub const MIN: u32 = 2;
-    pub const CURRENT: u32 = 20;
+    pub const CURRENT: u32 = 21;
 
     /// MGS protocol version in which SP watchdog messages were added
     pub const WATCHDOG_VERSION: u32 = 12;

gateway-messages/src/sp_to_mgs/ignition.rs

@@ -113,6 +113,7 @@ pub enum SystemType {
     Sidecar,
     Psc,
     Unknown(u16),
+    Cosmo,
 }
 
 impl From<u16> for SystemType {
@@ -121,6 +122,7 @@ impl From<u16> for SystemType {
             raw_system_type::GIMLET => Self::Gimlet,
             raw_system_type::SIDECAR => Self::Sidecar,
             raw_system_type::PSC => Self::Psc,
+            raw_system_type::COSMO => Self::Cosmo,
             _ => Self::Unknown(val),
         }
     }
@@ -131,6 +133,7 @@ mod raw_system_type {
     pub(super) const GIMLET: u16 = 0b0000_0000_0001_0001;
     pub(super) const SIDECAR: u16 = 0b0000_0000_0001_0010;
     pub(super) const PSC: u16 = 0b0000_0000_0001_0011;
+    pub(super) const COSMO: u16 = 0b0000_0000_0000_0100;
 }
 
 #[derive(

gateway-messages/tests/versioning/mod.rs

@@ -26,6 +26,7 @@ mod v17;
 mod v18;
 mod v19;
 mod v20;
+mod v21;
 
 pub fn assert_serialized<T: Serialize + SerializedSize + std::fmt::Debug>(
     expected: &[u8],

gateway-messages/tests/versioning/v21.rs

@@ -0,0 +1,34 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! This source file is named after the protocol version being tested,
+//! e.g. v01.rs implements tests for protocol version 1.
+//! The tested protocol version is represented by "$VERSION" below.
+//!
+//! The tests in this module check that the serialized form of messages from MGS
+//! protocol version $VERSION have not changed.
+//!
+//! If a test in this module fails, _do not change the test_! This means you
+//! have changed, deleted, or reordered an existing message type or enum
+//! variant, and you should revert that change. This will remain true until we
+//! bump the `version::MIN` to a value higher than $VERSION, at which point these
+//! tests can be removed as we will stop supporting $VERSION.
+
+use super::assert_serialized;
+use gateway_messages::ignition::SystemType;
+
+#[test]
+fn cosmo_ignition() {
+    // We technically only need `Cosmo` but test everything else
+    // here again for good measure
+    for (system_type, system_type_val) in [
+        (SystemType::Gimlet, &[0_u8] as &[_]),
+        (SystemType::Sidecar, &[1]),
+        (SystemType::Psc, &[2]),
+        (SystemType::Unknown(0xa0a1), &[3, 0xa1, 0xa0]),
+        (SystemType::Cosmo, &[4]),
+    ] {
+        assert_serialized(&system_type_val, &system_type);
+    }
+}