Removed use of temp file for comparison.

Author: JustAdam

template.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"io"
 	"io/ioutil"
 	"log"
 	"os"
@@ -85,21 +84,8 @@ func generateFile(config Config, containers Context) bool {
 		filteredContainers = containers
 	}
 
-	dest := os.Stdout
-	if config.Dest != "" {
-		dest, err = ioutil.TempFile(filepath.Dir(config.Dest), "docker-gen")
-		defer func() {
-			dest.Close()
-			os.Remove(dest.Name())
-		}()
-		if err != nil {
-			log.Fatalf("unable to create temp file: %s\n", err)
-		}
-	}
-
 	var buf bytes.Buffer
-	multiwriter := io.MultiWriter(dest, &buf)
-	err = tmpl.ExecuteTemplate(multiwriter, filepath.Base(templatePath), &filteredContainers)
+	err = tmpl.ExecuteTemplate(&buf, filepath.Base(templatePath), &filteredContainers)
 	if err != nil {
 		log.Fatalf("template error: %s\n", err)
 	}
@@ -115,7 +101,7 @@ func generateFile(config Config, containers Context) bool {
 		}
 
 		if bytes.Compare(contents, buf.Bytes()) != 0 {
-			err = os.Rename(dest.Name(), config.Dest)
+			err = ioutil.WriteFile(config.Dest, buf.Bytes(), os.FileMode(0640))
 			if err != nil {
 				log.Fatalf("unable to create dest file %s: %s\n", config.Dest, err)
 			}