diff --git a/pkg/backy/allowedexternaldirectives_enumer.go b/pkg/backy/allowedexternaldirectives_enumer.go
new file mode 100644
index 0000000..3b32870
--- /dev/null
+++ b/pkg/backy/allowedexternaldirectives_enumer.go
@@ -0,0 +1,145 @@
+// Code generated by "enumer -linecomment -yaml -text -json -type=AllowedExternalDirectives"; DO NOT EDIT.
+
+package backy
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+const _AllowedExternalDirectivesName = "DefaultExternalDirvaultvault-filevault-file-envfile-envfileenv"
+
+var _AllowedExternalDirectivesIndex = [...]uint8{0, 18, 23, 33, 47, 55, 59, 62}
+
+const _AllowedExternalDirectivesLowerName = "defaultexternaldirvaultvault-filevault-file-envfile-envfileenv"
+
+func (i AllowedExternalDirectives) String() string {
+	if i < 0 || i >= AllowedExternalDirectives(len(_AllowedExternalDirectivesIndex)-1) {
+		return fmt.Sprintf("AllowedExternalDirectives(%d)", i)
+	}
+	return _AllowedExternalDirectivesName[_AllowedExternalDirectivesIndex[i]:_AllowedExternalDirectivesIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _AllowedExternalDirectivesNoOp() {
+	var x [1]struct{}
+	_ = x[DefaultExternalDir-(0)]
+	_ = x[AllowedExternalDirectiveVault-(1)]
+	_ = x[AllowedExternalDirectiveVaultFile-(2)]
+	_ = x[AllowedExternalDirectiveAll-(3)]
+	_ = x[AllowedExternalDirectiveFileEnv-(4)]
+	_ = x[AllowedExternalDirectiveFile-(5)]
+	_ = x[AllowedExternalDirectiveEnv-(6)]
+}
+
+var _AllowedExternalDirectivesValues = []AllowedExternalDirectives{DefaultExternalDir, AllowedExternalDirectiveVault, AllowedExternalDirectiveVaultFile, AllowedExternalDirectiveAll, AllowedExternalDirectiveFileEnv, AllowedExternalDirectiveFile, AllowedExternalDirectiveEnv}
+
+var _AllowedExternalDirectivesNameToValueMap = map[string]AllowedExternalDirectives{
+	_AllowedExternalDirectivesName[0:18]:       DefaultExternalDir,
+	_AllowedExternalDirectivesLowerName[0:18]:  DefaultExternalDir,
+	_AllowedExternalDirectivesName[18:23]:      AllowedExternalDirectiveVault,
+	_AllowedExternalDirectivesLowerName[18:23]: AllowedExternalDirectiveVault,
+	_AllowedExternalDirectivesName[23:33]:      AllowedExternalDirectiveVaultFile,
+	_AllowedExternalDirectivesLowerName[23:33]: AllowedExternalDirectiveVaultFile,
+	_AllowedExternalDirectivesName[33:47]:      AllowedExternalDirectiveAll,
+	_AllowedExternalDirectivesLowerName[33:47]: AllowedExternalDirectiveAll,
+	_AllowedExternalDirectivesName[47:55]:      AllowedExternalDirectiveFileEnv,
+	_AllowedExternalDirectivesLowerName[47:55]: AllowedExternalDirectiveFileEnv,
+	_AllowedExternalDirectivesName[55:59]:      AllowedExternalDirectiveFile,
+	_AllowedExternalDirectivesLowerName[55:59]: AllowedExternalDirectiveFile,
+	_AllowedExternalDirectivesName[59:62]:      AllowedExternalDirectiveEnv,
+	_AllowedExternalDirectivesLowerName[59:62]: AllowedExternalDirectiveEnv,
+}
+
+var _AllowedExternalDirectivesNames = []string{
+	_AllowedExternalDirectivesName[0:18],
+	_AllowedExternalDirectivesName[18:23],
+	_AllowedExternalDirectivesName[23:33],
+	_AllowedExternalDirectivesName[33:47],
+	_AllowedExternalDirectivesName[47:55],
+	_AllowedExternalDirectivesName[55:59],
+	_AllowedExternalDirectivesName[59:62],
+}
+
+// AllowedExternalDirectivesString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func AllowedExternalDirectivesString(s string) (AllowedExternalDirectives, error) {
+	if val, ok := _AllowedExternalDirectivesNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _AllowedExternalDirectivesNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to AllowedExternalDirectives values", s)
+}
+
+// AllowedExternalDirectivesValues returns all values of the enum
+func AllowedExternalDirectivesValues() []AllowedExternalDirectives {
+	return _AllowedExternalDirectivesValues
+}
+
+// AllowedExternalDirectivesStrings returns a slice of all String values of the enum
+func AllowedExternalDirectivesStrings() []string {
+	strs := make([]string, len(_AllowedExternalDirectivesNames))
+	copy(strs, _AllowedExternalDirectivesNames)
+	return strs
+}
+
+// IsAAllowedExternalDirectives returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i AllowedExternalDirectives) IsAAllowedExternalDirectives() bool {
+	for _, v := range _AllowedExternalDirectivesValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}
+
+// MarshalJSON implements the json.Marshaler interface for AllowedExternalDirectives
+func (i AllowedExternalDirectives) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface for AllowedExternalDirectives
+func (i *AllowedExternalDirectives) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return fmt.Errorf("AllowedExternalDirectives should be a string, got %s", data)
+	}
+
+	var err error
+	*i, err = AllowedExternalDirectivesString(s)
+	return err
+}
+
+// MarshalText implements the encoding.TextMarshaler interface for AllowedExternalDirectives
+func (i AllowedExternalDirectives) MarshalText() ([]byte, error) {
+	return []byte(i.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface for AllowedExternalDirectives
+func (i *AllowedExternalDirectives) UnmarshalText(text []byte) error {
+	var err error
+	*i, err = AllowedExternalDirectivesString(string(text))
+	return err
+}
+
+// MarshalYAML implements a YAML Marshaler for AllowedExternalDirectives
+func (i AllowedExternalDirectives) MarshalYAML() (interface{}, error) {
+	return i.String(), nil
+}
+
+// UnmarshalYAML implements a YAML Unmarshaler for AllowedExternalDirectives
+func (i *AllowedExternalDirectives) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+
+	var err error
+	*i, err = AllowedExternalDirectivesString(s)
+	return err
+}