config: check a remote exists when creating a new one

fs/config/config.go

@@ -1084,12 +1084,17 @@ func fsOption() *fs.Option {
 	return o
 }
 
-// NewRemoteName asks the user for a name for a remote
+// NewRemoteName asks the user for a name for a new remote
 func NewRemoteName() (name string) {
 	for {
 		fmt.Printf("name> ")
 		name = ReadLine()
-		err := fspath.CheckConfigName(name)
+		_, err := getConfigData().GetSection(name)
+		if err == nil {
+			fmt.Printf("Remote %q already exists.\n", name)
+			continue
+		}
+		err = fspath.CheckConfigName(name)
 		switch {
 		case name == "":
 			fmt.Printf("Can't use empty name.\n")

fs/config/config_test.go

@@ -115,14 +115,6 @@ func TestCRUD(t *testing.T) {
 	assert.Equal(t, "true", FileGet("asdf", "bool"))
 	assert.Equal(t, "secret", obscure.MustReveal(FileGet("asdf", "pass")))
 
-	// no-op rename, asdf → asdf
-	RenameRemote("asdf")
-
-	assert.Equal(t, []string{"asdf"}, configFile.GetSectionList())
-	assert.Equal(t, "config_test_remote", FileGet("asdf", "type"))
-	assert.Equal(t, "true", FileGet("asdf", "bool"))
-	assert.Equal(t, "secret", obscure.MustReveal(FileGet("asdf", "pass")))
-
 	// delete remote
 	DeleteRemote("asdf")
 	assert.Equal(t, []string{}, configFile.GetSectionList())
@@ -163,6 +155,28 @@ func TestChooseOption(t *testing.T) {
 	assert.Equal(t, "", FileGet("test", "pass"))
 }
 
+func TestNewRemoteName(t *testing.T) {
+	defer testConfigFile(t, "crud.conf")()
+
+	// script for creating remote
+	ReadLine = makeReadLine([]string{
+		"config_test_remote", // type
+		"true",               // bool value
+		"n",                  // not required
+		"y",                  // looks good, save
+	})
+	NewRemote("test")
+
+	ReadLine = makeReadLine([]string{
+		"test",           // already exists
+		"",               // empty string not allowed
+		"bad@characters", // bad characters
+		"newname",        // OK
+	})
+
+	assert.Equal(t, "newname", NewRemoteName())
+}
+
 func TestCreateUpatePasswordRemote(t *testing.T) {
 	defer testConfigFile(t, "update.conf")()