[mgs] Information about RoT updates

dev-tools/reconfigurator-sp-updater/src/main.rs

@@ -322,6 +322,8 @@ fn cmd_config(
                     expected_active_version, expected_inactive_version,
                 )?;
             }
+            // TODO-K: Print preconditions
+            PendingMgsUpdateDetails::RoT {} => todo!(),
         }
 
         writeln!(&mut s)?;

nexus/mgs-updates/src/driver.rs

@@ -319,6 +319,12 @@ impl MgsUpdateDriver {
 
                 (sp_update, Box::new(ReconfiguratorSpUpdater {}))
             }
+            // TODO-K: fill in necessary component information
+            nexus_types::deployment::PendingMgsUpdateDetails::RoT {
+                ..
+            } => {
+                todo!()
+            }
         };
 
         let baseboard_id = baseboard_id.clone();

nexus/mgs-updates/src/sp_updater.rs

@@ -212,7 +212,12 @@ impl SpComponentUpdateHelper for ReconfiguratorSpUpdater {
             let PendingMgsUpdateDetails::Sp {
                 expected_active_version,
                 expected_inactive_version,
-            } = &update.details;
+            } = &update.details
+            else {
+                unreachable!(
+                    "pending MGS update details will always be for the SP"
+                );
+            };
             if caboose.version != expected_active_version.to_string() {
                 return Err(PrecheckError::WrongActiveVersion {
                     expected: expected_active_version.clone(),

nexus/types/src/deployment.rs

@@ -1260,6 +1260,10 @@ pub enum PendingMgsUpdateDetails {
         /// expected contents of the inactive slot
         expected_inactive_version: ExpectedVersion,
     },
+    /// the RoT is being updated
+    RoT {
+        // TODO-K: Fill in fields
+    },
 }
 
 impl slog::KV for PendingMgsUpdateDetails {
@@ -1283,6 +1287,8 @@ impl slog::KV for PendingMgsUpdateDetails {
                     &format!("{:?}", expected_inactive_version),
                 )
             }
+            // TODO-K: Set serialiser information
+            PendingMgsUpdateDetails::RoT {} => todo!(),
         }
     }
 }