Handle ltc create condition where cannot determine start command.

[Fixes #90207888]

Signed-off-by: David Wadden <[email protected]>

ltc/app_runner/command_factory/app_runner_command_factory.go

@@ -250,9 +250,14 @@ func (factory *AppRunnerCommandFactory) createApp(context *cli.Context) {
 	}
 
 	if startCommand == "" {
-		factory.output.Say("No start command specified, using start command from the image metadata...\n")
+		if len(imageMetadata.StartCommand) == 0 {
+			factory.output.SayLine("Unable to determine start command from image metadata.")
+			return
+		}
 
+		factory.output.Say("No start command specified, using start command from the image metadata...\n")
 		startCommand = imageMetadata.StartCommand[0]
+
 		factory.output.Say("Start command is:\n")
 		factory.output.Say(strings.Join(imageMetadata.StartCommand, " ") + "\n")
 

ltc/app_runner/command_factory/app_runner_command_factory_test.go

@@ -516,6 +516,18 @@ var _ = Describe("CommandFactory", func() {
 				test_helpers.ExecuteCommandWithArgs(createCommand, args)
 
 				Expect(outputBuffer).ToNot(test_helpers.Say("Working directory is:"))
+				Expect(appRunner.CreateDockerAppCallCount()).To(Equal(1))
+			})
+
+			Context("when the metadata also has no start command", func() {
+				It("outputs an error message and exits", func() {
+					dockerMetadataFetcher.FetchMetadataReturns(&docker_metadata_fetcher.ImageMetadata{}, nil)
+
+					test_helpers.ExecuteCommandWithArgs(createCommand, args)
+
+					Expect(outputBuffer).To(test_helpers.Say("Unable to determine start command from image metadata.\n"))
+					Expect(appRunner.CreateDockerAppCallCount()).To(BeZero())
+				})
 			})
 		})