fix: do not overwrite .npmrc

Author: christophwitzko

update/package_json.go

@@ -26,5 +26,10 @@ func packageJson(newVersion string, file *os.File) error {
 	if err := enc.Encode(data); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(path.Join(path.Dir(file.Name()), ".npmrc"), []byte(npmrc), 0644)
+	npmrcPath := path.Join(path.Dir(file.Name()), ".npmrc")
+	_, err := os.Stat(npmrcPath)
+	if os.IsNotExist(err) {
+		return ioutil.WriteFile(npmrcPath, []byte(npmrc), 0644)
+	}
+	return err
 }

update/package_json_test.go

@@ -15,8 +15,10 @@ func TestPackageJson(t *testing.T) {
 	}
 	defer f.Close()
 	nVer := "1.2.3"
+	npmrcPath := "../test-fixtures/.npmrc"
+	os.Remove(npmrcPath)
 	packageJson(nVer, f)
-	npmfile, err := ioutil.ReadFile("../test-fixtures/.npmrc")
+	npmfile, err := ioutil.ReadFile(npmrcPath)
 	if err != nil || bytes.Compare(npmfile, []byte(npmrc)) != 0 {
 		t.Fatal("invalid .npmrc")
 	}
@@ -27,3 +29,25 @@ func TestPackageJson(t *testing.T) {
 		t.Fatal("invalid version")
 	}
 }
+
+func TestNpmrc(t *testing.T) {
+	f, err := os.OpenFile("../test-fixtures/package.json", os.O_RDWR, 0)
+	if err != nil {
+		t.Fatal("fixture missing")
+	}
+	defer f.Close()
+	nVer := "1.2.3"
+	npmrcPath := "../test-fixtures/.npmrc"
+	ioutil.WriteFile(npmrcPath, []byte("TEST"), 0644)
+	packageJson(nVer, f)
+	npmfile, err := ioutil.ReadFile(npmrcPath)
+	if err != nil || bytes.Compare(npmfile, []byte("TEST")) != 0 {
+		t.Fatal("invalid .npmrc")
+	}
+	f.Seek(0, 0)
+	var data map[string]json.RawMessage
+	json.NewDecoder(f).Decode(&data)
+	if bytes.Compare(data["version"], []byte("\""+nVer+"\"")) != 0 {
+		t.Fatal("invalid version")
+	}
+}