feat: add a variant to KnownJobCobs that makes no updates

src/adapter.rs

@@ -535,7 +535,7 @@ mod test {
 
     #[allow(clippy::unwrap_used)]
     fn known() -> Arc<Mutex<KnownJobCobs>> {
-        Arc::new(Mutex::new(KnownJobCobs::new().unwrap()))
+        Arc::new(Mutex::new(KnownJobCobs::updater().unwrap()))
     }
 
     #[allow(clippy::unwrap_used)]

src/bin/cibtoolcmd/cob.rs

@@ -29,7 +29,7 @@ impl Leaf for CobCmd {
         let url = Url::parse("https://liw.fi").unwrap();
         let run_id = RunId::default();
         let known = Arc::new(Mutex::new(
-            KnownJobCobs::new().map_err(CibToolError::KnownJobCobs)?,
+            KnownJobCobs::updater().map_err(CibToolError::KnownJobCobs)?,
         ));
         for i in 0..self.n {
             println!("{i}");

src/broker.rs

@@ -223,7 +223,7 @@ mod test {
 
     #[allow(clippy::unwrap_used)]
     fn known() -> Arc<Mutex<KnownJobCobs>> {
-        Arc::new(Mutex::new(KnownJobCobs::new().unwrap()))
+        Arc::new(Mutex::new(KnownJobCobs::updater().unwrap()))
     }
 
     #[test]

src/cob.rs

@@ -29,19 +29,27 @@ use crate::{ergo::Oid, logger, msg::RunId};
 /// Lookup cache for job COBs.
 ///
 /// This assumes job COBs are not removed from the node.
+#[allow(clippy::large_enum_variant)]
 pub enum KnownJobCobs {
+    NoUpdates,
     Updater(JobUpdater),
 }
 
 impl KnownJobCobs {
+    /// Cre3ate q new [`KnownJobCobs`] that does NOT update job COBs.
+    pub fn no_updater() -> Self {
+        Self::NoUpdates
+    }
+
     /// Create a new [`KnownJobCobs`] that updates job COBs.
-    pub fn new() -> Result<Self, JobError> {
+    pub fn updater() -> Result<Self, JobError> {
         Ok(Self::Updater(JobUpdater::new()?))
     }
 
     /// Look up job COB for a specific commit.
     pub fn create_job(&mut self, repo_id: RepoId, oid: Oid) -> Option<JobId> {
         match self {
+            Self::NoUpdates => None,
             Self::Updater(x) => x.create_job(repo_id, oid),
         }
     }
@@ -58,6 +66,7 @@ impl KnownJobCobs {
         announce: bool,
     ) {
         match self {
+            Self::NoUpdates => (),
             Self::Updater(x) => x.create_run(repo_id, oid, run_id, url, announce),
         }
     }

src/queueproc.rs

@@ -76,7 +76,7 @@ impl QueueProcessorBuilder {
             child_pid_tx,
             child_pid_rx,
             known_job_cobs: Arc::new(Mutex::new(
-                KnownJobCobs::new().map_err(QueueError::KnownJobCobs)?,
+                KnownJobCobs::updater().map_err(QueueError::KnownJobCobs)?,
             )),
         })
     }