add status message when launcher failed (#487)

launch.go

@@ -764,13 +764,14 @@ func launchAction(api screwdriver.API, buildID int, rootDir, emitterPath, metaSp
 
 	err, sourceDir, launchShellBin := launch(api, buildID, rootDir, emitterPath, metaSpace, storeURI, uiURI, shellBin, buildTimeout, buildToken, cacheStrategy, pipelineCacheDir, jobCacheDir, eventCacheDir, cacheCompress, cacheMd5Check, isLocal, cacheMaxSizeInMB, cacheMaxGoThreads)
 	if err != nil {
-		if _, ok := err.(executor.ErrStatus); ok {
-			log.Printf("Failure due to non-zero exit code: %v\n", err)
-		} else {
-			log.Printf("Error running launcher: %v\n", err)
+		var errMsg string
+		errMsg = fmt.Sprintf("Error running launcher: %v", err)
+		if statusErr, ok := err.(executor.ErrStatus); ok {
+			errMsg = fmt.Sprintf("Error running launcher due to non-zero exit code: %v", statusErr)
 		}
+		log.Println(errMsg)
 
-		prepareExit(screwdriver.Failure, buildID, api, metaSpace, "")
+		prepareExit(screwdriver.Failure, buildID, api, metaSpace, errMsg)
 		TerminateSleep(launchShellBin, sourceDir, true)
 		cleanExit()
 		return nil