init: log failures if a service cannot start during class_start

Test: boot system with this logging and see appropriate failures
Change-Id: I312dca89f6215afe05b10b2539258a212a0c1ae2

1 files changed, 8 insertions, 1 deletions

diff --git a/init/builtins.cpp b/init/builtins.cpp
index 60c0007c0e..027b392fd0 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -99,7 +99,14 @@ static void ForEachServiceInClass(const std::string& classname, F function) {
 static Result<Success> do_class_start(const BuiltinArguments& args) {
     // Starting a class does not start services which are explicitly disabled.
     // They must  be started individually.
-    ForEachServiceInClass(args[1], &Service::StartIfNotDisabled);
+    for (const auto& service : ServiceList::GetInstance()) {
+        if (service->classnames().count(args[1])) {
+            if (auto result = service->StartIfNotDisabled(); !result) {
+                LOG(ERROR) << "Could not start service '" << service->name()
+                           << "' as part of class '" << args[1] << "': " << result.error();
+            }
+        }
+    }
     return Success();
 }