Merge pull request #1309 from domelz/fix/master/1308

Add DEBUG messages to identify missing dependencies

manager/runner.go

@@ -691,12 +691,20 @@ func (r *Runner) runTemplate(tmpl *template.Template, runCtx *templateRunCtx) (*
 	// Grab the list of used and missing dependencies.
 	missing, used := result.Missing, result.Used
 
+	if l := missing.Len(); l > 0 {
+		log.Printf("[DEBUG] (runner) missing data for %d dependencies", l)
+		for _, missingDependency := range missing.List() {
+			log.Printf("[DEBUG] (runner) missing dependency: %s", missingDependency)
+		}
+	}
+
 	// Add the dependency to the list of dependencies for this runner.
 	for _, d := range used.List() {
 		// If we've taken over leadership for a template, we may have data
 		// that is cached, but not have the watcher. We must treat this as
 		// missing so that we create the watcher and re-run the template.
 		if isLeader && !r.watcher.Watching(d) {
+			log.Printf("[DEBUG] (runner) add used dependency %s to missing since isLeader but do not have a watcher", d)
 			missing.Add(d)
 		}
 		if _, ok := runCtx.depsMap[d.String()]; !ok {