Make auto-generated files read-only (#2323)

github/gen-accessors.go

@@ -186,10 +186,18 @@ func (t *templateData) dump() error {
 		}
 
 		logf("Writing %v...", filename)
-		if err := ioutil.WriteFile(filename, clean, 0644); err != nil {
+		if err := os.Chmod(filename, 0644); err != nil {
+			return fmt.Errorf("os.Chmod(%q, 0644): %v", filename, err)
+		}
+
+		if err := ioutil.WriteFile(filename, clean, 0444); err != nil {
 			return err
 		}
 
+		if err := os.Chmod(filename, 0444); err != nil {
+			return fmt.Errorf("os.Chmod(%q, 0444): %v", filename, err)
+		}
+
 		return nil
 	}
 
@@ -329,6 +337,8 @@ const source = `// Copyright {{.Year}} The go-github AUTHORS. All rights reserve
 // license that can be found in the LICENSE file.
 
 // Code generated by gen-accessors; DO NOT EDIT.
+// Instead, please run "go generate ./..." as described here:
+// https://github.com/google/go-github/blob/master/CONTRIBUTING.md#submitting-a-patch
 
 package {{.Package}}
 {{with .Imports}}
@@ -373,6 +383,8 @@ const test = `// Copyright {{.Year}} The go-github AUTHORS. All rights reserved.
 // license that can be found in the LICENSE file.
 
 // Code generated by gen-accessors; DO NOT EDIT.
+// Instead, please run "go generate ./..." as described here:
+// https://github.com/google/go-github/blob/master/CONTRIBUTING.md#submitting-a-patch
 
 package {{.Package}}
 {{with .Imports}}

github/gen-stringify-test.go

@@ -352,7 +352,19 @@ func (t *templateData) dump() error {
 	}
 
 	logf("Writing %v...", t.filename)
-	return ioutil.WriteFile(t.filename, clean, 0644)
+	if err := os.Chmod(t.filename, 0644); err != nil {
+		return fmt.Errorf("os.Chmod(%q, 0644): %v", t.filename, err)
+	}
+
+	if err := ioutil.WriteFile(t.filename, clean, 0444); err != nil {
+		return err
+	}
+
+	if err := os.Chmod(t.filename, 0444); err != nil {
+		return fmt.Errorf("os.Chmod(%q, 0444): %v", t.filename, err)
+	}
+
+	return nil
 }
 
 func newStructField(receiverType, fieldName, fieldType, zeroValue string, namedStruct bool) *structField {
@@ -379,6 +391,8 @@ const source = `// Copyright {{.Year}} The go-github AUTHORS. All rights reserve
 // license that can be found in the LICENSE file.
 
 // Code generated by gen-stringify-tests; DO NOT EDIT.
+// Instead, please run "go generate ./..." as described here:
+// https://github.com/google/go-github/blob/master/CONTRIBUTING.md#submitting-a-patch
 
 package {{ $package := .Package}}{{$package}}
 {{with .Imports}}