config: Fix generated passwords being stored as empty password - Fixes …

…#3492

fs/config/config.go

@@ -89,6 +89,9 @@ var (
 	// For security reasons, the temp file is deleted once the configKey is successfully loaded.
 	// This can be used to pass the configKey to a child process.
 	PassConfigKeyForDaemonization = false
+
+	// Password can be used to configure the random password generator
+	Password = random.Password
 )
 
 func init() {
@@ -854,14 +857,15 @@ func ChooseOption(o *fs.Option, name string) string {
 			actions = append(actions, "nNo leave this optional password blank")
 		}
 		var password string
+		var err error
 		switch i := Command(actions); i {
 		case 'y':
 			password = ChangePassword("the")
 		case 'g':
 			for {
 				fmt.Printf("Password strength in bits.\n64 is just about memorable\n128 is secure\n1024 is the maximum\n")
 				bits := ChooseNumber("Bits", 64, 1024)
-				password, err := random.Password(bits)
+				password, err = Password(bits)
 				if err != nil {
 					log.Fatalf("Failed to make password: %v", err)
 				}

fs/config/config_test.go

@@ -30,6 +30,7 @@ func testConfigFile(t *testing.T, configFileName string) func() {
 	oldConfig := fs.Config
 	oldConfigFile := configFile
 	oldReadLine := ReadLine
+	oldPassword := Password
 	os.Stdout = nil
 	ConfigPath = path
 	fs.Config = &fs.ConfigInfo{}
@@ -63,6 +64,7 @@ func testConfigFile(t *testing.T, configFileName string) func() {
 		os.Stdout = oldOsStdout
 		ConfigPath = oldConfigPath
 		ReadLine = oldReadLine
+		Password = oldPassword
 		fs.Config = oldConfig
 		configFile = oldConfigFile
 
@@ -71,24 +73,28 @@ func testConfigFile(t *testing.T, configFileName string) func() {
 	}
 }
 
-func TestCRUD(t *testing.T) {
-	defer testConfigFile(t, "crud.conf")()
-
-	// expect script for creating remote
+// makeReadLine makes a simple readLine which returns a fixed list of
+// strings
+func makeReadLine(answers []string) func() string {
 	i := 0
-	ReadLine = func() string {
-		answers := []string{
-			"config_test_remote", // type
-			"true",               // bool value
-			"y",                  // type my own password
-			"secret",             // password
-			"secret",             // repeat
-			"y",                  // looks good, save
-		}
+	return func() string {
 		i = i + 1
 		return answers[i-1]
 	}
+}
 
+func TestCRUD(t *testing.T) {
+	defer testConfigFile(t, "crud.conf")()
+
+	// script for creating remote
+	ReadLine = makeReadLine([]string{
+		"config_test_remote", // type
+		"true",               // bool value
+		"y",                  // type my own password
+		"secret",             // password
+		"secret",             // repeat
+		"y",                  // looks good, save
+	})
 	NewRemote("test")
 
 	assert.Equal(t, []string{"test"}, configFile.GetSectionList())
@@ -97,7 +103,11 @@ func TestCRUD(t *testing.T) {
 	assert.Equal(t, "secret", obscure.MustReveal(FileGet("test", "pass")))
 
 	// normal rename, test → asdf
-	ReadLine = func() string { return "asdf" }
+	ReadLine = makeReadLine([]string{
+		"asdf",
+		"asdf",
+		"asdf",
+	})
 	RenameRemote("test")
 
 	assert.Equal(t, []string{"asdf"}, configFile.GetSectionList())
@@ -118,6 +128,41 @@ func TestCRUD(t *testing.T) {
 	assert.Equal(t, []string{}, configFile.GetSectionList())
 }
 
+func TestChooseOption(t *testing.T) {
+	defer testConfigFile(t, "crud.conf")()
+
+	// script for creating remote
+	ReadLine = makeReadLine([]string{
+		"config_test_remote", // type
+		"false",              // bool value
+		"x",                  // bad choice
+		"g",                  // generate password
+		"1024",               // very big
+		"y",                  // password OK
+		"y",                  // looks good, save
+	})
+	Password = func(bits int) (string, error) {
+		assert.Equal(t, 1024, bits)
+		return "not very random password", nil
+	}
+	NewRemote("test")
+
+	assert.Equal(t, "false", FileGet("test", "bool"))
+	assert.Equal(t, "not very random password", obscure.MustReveal(FileGet("test", "pass")))
+
+	// script for creating remote
+	ReadLine = makeReadLine([]string{
+		"config_test_remote", // type
+		"true",               // bool value
+		"n",                  // not required
+		"y",                  // looks good, save
+	})
+	NewRemote("test")
+
+	assert.Equal(t, "true", FileGet("test", "bool"))
+	assert.Equal(t, "", FileGet("test", "pass"))
+}
+
 func TestCreateUpatePasswordRemote(t *testing.T) {
 	defer testConfigFile(t, "update.conf")()