Make starterd print out its own version on failed applications

We already printed out application versions if they had self-reported a
timing report before crashing; however, it is useful to always have
_some_ version information, so include the starterd's own version in the
log message.

Change-Id: Ia75b8a1b2f54bc659d05b05d131acefa6e2aa8ee
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/starter/subprocess_test.cc b/aos/starter/subprocess_test.cc
index 12f7f6d..fcc1128 100644
--- a/aos/starter/subprocess_test.cc
+++ b/aos/starter/subprocess_test.cc
@@ -105,6 +105,89 @@
   ASSERT_EQ(aos::starter::State::STOPPED, echo_stderr.status());
 }
 
+// Checks that when a child application crashing results in the starter printing
+// out its own version by default.
+TEST_F(SubprocessTest, PrintNoTimingReportVersionString) {
+  const std::string config_file =
+      ::aos::testing::ArtifactPath("aos/events/pingpong_config.json");
+
+  ::testing::internal::CaptureStderr();
+
+  // Set up application without quiet flag active
+  aos::FlatbufferDetachedBuffer<aos::Configuration> config =
+      aos::configuration::ReadConfig(config_file);
+  aos::ShmEventLoop event_loop(&config.message());
+  event_loop.SetVersionString("version_string");
+  bool observed_stopped = false;
+  Application error_out(
+      "false", "bash", &event_loop,
+      [&observed_stopped, &error_out]() {
+        if (error_out.status() == aos::starter::State::STOPPED) {
+          observed_stopped = true;
+        }
+      },
+      Application::QuietLogging::kNo);
+  error_out.set_args({"-c", "sleep 3; false"});
+
+  error_out.Start();
+  aos::TimerHandler *exit_timer =
+      event_loop.AddTimer([&event_loop]() { event_loop.Exit(); });
+  event_loop.OnRun([&event_loop, exit_timer]() {
+    exit_timer->Schedule(event_loop.monotonic_now() +
+                         std::chrono::milliseconds(5000));
+  });
+
+  event_loop.Run();
+
+  // Ensure presence of logs without quiet flag
+  std::string output = ::testing::internal::GetCapturedStderr();
+  std::string expected = "starter version 'version_string'";
+
+  ASSERT_TRUE(output.find(expected) != std::string::npos) << output;
+  EXPECT_TRUE(observed_stopped);
+  EXPECT_EQ(aos::starter::State::STOPPED, error_out.status());
+}
+
+TEST_F(SubprocessTest, PrintFailedToStartVersionString) {
+  const std::string config_file =
+      ::aos::testing::ArtifactPath("aos/events/pingpong_config.json");
+
+  ::testing::internal::CaptureStderr();
+
+  // Set up application without quiet flag active
+  aos::FlatbufferDetachedBuffer<aos::Configuration> config =
+      aos::configuration::ReadConfig(config_file);
+  aos::ShmEventLoop event_loop(&config.message());
+  event_loop.SetVersionString("version_string");
+  bool observed_stopped = false;
+  Application error_out(
+      "false", "false", &event_loop,
+      [&observed_stopped, &error_out]() {
+        if (error_out.status() == aos::starter::State::STOPPED) {
+          observed_stopped = true;
+        }
+      },
+      Application::QuietLogging::kNo);
+
+  error_out.Start();
+  aos::TimerHandler *exit_timer =
+      event_loop.AddTimer([&event_loop]() { event_loop.Exit(); });
+  event_loop.OnRun([&event_loop, exit_timer]() {
+    exit_timer->Schedule(event_loop.monotonic_now() +
+                         std::chrono::milliseconds(1500));
+  });
+
+  event_loop.Run();
+
+  // Ensure presence of logs without quiet flag
+  std::string output = ::testing::internal::GetCapturedStderr();
+  std::string expected = "starter version 'version_string'";
+
+  ASSERT_TRUE(output.find(expected) != std::string::npos) << output;
+  EXPECT_TRUE(observed_stopped);
+  EXPECT_EQ(aos::starter::State::STOPPED, error_out.status());
+}
+
 TEST_F(SubprocessTest, UnactiveQuietFlag) {
   const std::string config_file =
       ::aos::testing::ArtifactPath("aos/events/pingpong_config.json");
@@ -142,7 +225,8 @@
   std::string expectedRun = "exited unexpectedly with status";
 
   ASSERT_TRUE(output.find(expectedStart) != std::string::npos ||
-              output.find(expectedRun) != std::string::npos);
+              output.find(expectedRun) != std::string::npos)
+      << output;
   EXPECT_TRUE(observed_stopped);
   EXPECT_EQ(aos::starter::State::STOPPED, error_out.status());
 }