Cache results in repository even if diff was empty

CHANGELOG.md

@@ -17,6 +17,8 @@ All notable changes to `src-cli` are documented in this file.
 
 ### Fixed
 
+- `src campaign [apply|preview]` now caches the result of running steps in a repository even if they didn't produce changes.
+
 ## 3.21.8
 
 ### Fixed

internal/campaigns/executor.go

@@ -261,25 +261,25 @@ func (x *executor) do(ctx context.Context, task *Task) (err error) {
 		return
 	}
 
+	// Build the changeset spec.
+	spec := createChangesetSpec(task, string(diff), x.features)
+
+	// Add to the cache. We don't use runCtx here because we want to write to
+	// the cache even if we've now reached the timeout.
+	if err = x.cache.Set(ctx, cacheKey, spec); err != nil {
+		err = errors.Wrapf(err, "caching result for %q", task.Repository.Name)
+	}
+
 	// If the steps didn't result in any diff, we don't need to add it to the
 	// list of specs that are displayed to the user and send to the server.
 	if len(diff) == 0 {
 		x.updateTaskStatus(task, status)
 		return
 	}
 
-	// Build the changeset spec.
-	spec := createChangesetSpec(task, string(diff), x.features)
-
 	status.ChangesetSpec = spec
 	x.updateTaskStatus(task, status)
 
-	// Add to the cache. We don't use runCtx here because we want to write to
-	// the cache even if we've now reached the timeout.
-	if err = x.cache.Set(ctx, cacheKey, spec); err != nil {
-		err = errors.Wrapf(err, "caching result for %q", task.Repository.Name)
-	}
-
 	// Add the spec to the executor's list of completed specs.
 	x.specsMu.Lock()
 	x.specs = append(x.specs, spec)