Merge PR #19 'janetkuo-overwrite-not-append-file'

cli/app/app.go

@@ -285,6 +285,26 @@ func ProjectKuberConvert(p *project.Project, c *cli.Context) {
 		logrus.Fatalf("Failed to parse the compose project from %s: %v", composeFile, err)
 	}
 
+	//// check flags
+	//if c.BoolT("yaml") {
+	//	generateYaml = true
+	//}
+	//
+	//if c.BoolT("stdout") {
+	//	toStdout = true
+	//}
+
+	// Create the file f to write to if --out is specified
+	var f *os.File
+	var err error
+	if len(outFile) != 0 {
+		f, err = os.Create(outFile)
+		if err != nil {
+			logrus.Fatalf("error opening file: %v", err)
+		}
+		defer f.Close()
+	}
+
 	var mServices map[string]api.Service = make(map[string]api.Service)
 	var serviceLinks []string
 
@@ -689,20 +709,19 @@ func ProjectKuberConvert(p *project.Project, c *cli.Context) {
 		// If --out or --stdout is set, the validation should already prevent multiple controllers being generated
 		if createD {
 			// Create the deployment
-			print(name, "deployment", datadc, toStdout, generateYaml, outFile)
+			print(name, "deployment", datadc, toStdout, generateYaml, f)
 		}
 		if createDS {
 			// Create the daemonset
-			print(name, "daemonset", datads, toStdout, generateYaml, outFile)
+			print(name, "daemonset", datads, toStdout, generateYaml, f)
 		}
 		if createRS {
 			// Create the replicaset container
-			print(name, "replicaset", datars, toStdout, generateYaml, outFile)
+			print(name, "replicaset", datars, toStdout, generateYaml, f)
 		}
 		// We can create RC when we either don't print to --out or --stdout, or we don't create any other controllers
 		if !singleOutput || (!createD && !createDS && !createRS) {
-			// Create the replication controller
+			print(name, "rc", datarc, toStdout, generateYaml, f)
-			print(name, "rc", datarc, toStdout, generateYaml, outFile)
 		}
 
 		// Create the services
@@ -719,10 +738,13 @@ func ProjectKuberConvert(p *project.Project, c *cli.Context) {
 
 				logrus.Debugf("%s\n", datasvc)
 
-				print(k, "svc", datasvc, toStdout, generateYaml, outFile)
+				print(k, "svc", datasvc, toStdout, generateYaml, f)
 			}
 		}
 	}
+	if f != nil {
+		fmt.Fprintf(os.Stdout, "file %q created\n", outFile)
+	}
 
 	/* Need to iterate through one more time to ensure we capture all service/rc */
 	for name := range p.Configs {
@@ -746,30 +768,29 @@ func checkUnsupportedKey(service project.ServiceConfig) {
 	}
 }
 
-func print(name, trailing string, data []byte, toStdout, generateYaml bool, outFile string) {
+func print(name, trailing string, data []byte, toStdout, generateYaml bool, f *os.File) {
 	file := fmt.Sprintf("%s-%s.json", name, trailing)
 	if generateYaml {
 		file = fmt.Sprintf("%s-%s.yaml", name, trailing)
 	}
-	if outFile != "" {
-		file = outFile
-	}
 	separator := ""
 	if generateYaml {
 		separator = "---"
 	}
 	if toStdout {
 		fmt.Fprintf(os.Stdout, "%s%s\n", string(data), separator)
-	} else {
+	} else if f != nil {
-		f, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
+		// Write all content to a single file f
-		if err != nil {
+		if _, err := f.WriteString(fmt.Sprintf("%s%s\n", string(data), separator)); err != nil {
-			logrus.Fatalf("error opening file: %v", err)
-		}
-		defer f.Close()
-		if _, err = f.WriteString(string(data) + "\n" + separator); err != nil {
 			logrus.Fatalf("Failed to write %s to file: %v", trailing, err)
 		}
-		fmt.Println("file " + file + " has been created")
+		f.Sync()
+	} else {
+		// Write content separately to each file
+		if err := ioutil.WriteFile(file, []byte(data), 0644); err != nil {
+			logrus.Fatalf("Failed to write %s: %v", trailing, err)
+		}
+		fmt.Fprintf(os.Stdout, "file %q created\n", file)
 	}
 }