porch: Fix watcher duplication bug (#4067)

* Fix watcher duplication bug

Signed-off-by: John Belamaric <[email protected]>

* Free up space on GitHub runner

Signed-off-by: John Belamaric <[email protected]>

---------

Signed-off-by: John Belamaric <[email protected]>

Author: johnbelamaric

.github/workflows/porch-e2e.yml

@@ -53,6 +53,8 @@ jobs:
           - "kindest/node:v1.23.4@sha256:0e34f0d0fd448aa2f2819cfd74e99fe5793a6e4938b328f657c8e3f81ee0dfb9"
 
     steps:
+      - name: Free up disk space
+        run: sudo rm -rf /usr/share/dotnet && sudo rm -rf /opt/ghc && sudo rm -rf "/usr/local/share/boost" && sudo rm -rf "$AGENT_TOOLSDIRECTORY"
       - name: Set up Go
         uses: actions/setup-go@v3
         with:

porch/pkg/engine/watchermanager.go

@@ -71,20 +71,26 @@ func (r *watcherManager) WatchPackageRevisions(ctx context.Context, filter repos
 		filter:         filter,
 	}
 
+	active := 0
 	// See if we have an empty slot in the watchers list
 	inserted := false
 	for i, watcher := range r.watchers {
-		if watcher == nil {
+		if watcher != nil {
+			active += 1
+		} else if !inserted {
+			active += 1
 			r.watchers[i] = w
 			inserted = true
 		}
 	}
 
 	if !inserted {
 		// We didn't slot it in to an existing slot, append it
+		active += 1
 		r.watchers = append(r.watchers, w)
 	}
 
+	klog.Infof("added watcher %p; there are now %d active watchers and %d slots", w, active, len(r.watchers))
 	return nil
 }