Attempt to fix partial config parsing issue

Using a *yaml.Node does not work.

backend/backend.go

@@ -16,5 +16,5 @@ type Database interface {
 // Config is how users configure a database backend.
 type Config struct {
 	Type   string    `yaml:"type"`
-	Params *yaml.Node `yaml:"params"`
+	Params yaml.Node `yaml:"params"`
 }

dovecot/keyproxy.go

@@ -98,9 +98,9 @@ func NewKeyLookupProxy(config *Config) (*KeyLookupProxy, error) {
 	var db backend.Database
 	switch config.Backend.Type {
 	case "ldap":
-		db, err = ldapBE.New(config.Backend.Params)
+		db, err = ldapBE.New(&config.Backend.Params)
 	case "sql":
-		db, err = sqlBE.New(config.Backend.Params)
+		db, err = sqlBE.New(&config.Backend.Params)
 	default:
 		err = errors.New("unknown backend type")
 	}

dovecot/keyproxy_test.go

@@ -44,11 +44,10 @@ func withTestDB(t testing.TB, schema string) (func(), string) {
 	}, dbPath
 }
 
-func makeMapSlice(m map[string]interface{}) *yaml.Node {
-	var out yaml.Node
+func makeMapSlice(m map[string]interface{}) (out yaml.Node) {
 	d, _ := yaml.Marshal(m)
-	yaml.Unmarshal(d, &out)
-	return &out
+	yaml.Unmarshal(d, &out) // nolint: errcheck
+	return
 }
 
 var (

server/keystore.go

@@ -106,9 +106,9 @@ func NewKeyStore(config *Config) (*KeyStore, error) {
 	var err error
 	switch config.Backend.Type {
 	case "ldap":
-		db, err = ldapBE.New(config.Backend.Params)
+		db, err = ldapBE.New(&config.Backend.Params)
 	case "sql":
-		db, err = sqlBE.New(config.Backend.Params)
+		db, err = sqlBE.New(&config.Backend.Params)
 	default:
 		err = errors.New("unknown backend type")
 	}