Make SingleValueStore extend Store instead of the other way around.

Signed-off-by: Felix Fontein <felix@fontein.de>

cmd/sops/main.go

@@ -2090,7 +2090,12 @@ func getEncryptConfig(c *cli.Context, fileName string, inputStore common.Store,
 		}
 	}
 
-	if inputStore.IsSingleValueStore() {
+	isSingleValueStore := false
+	if svs, ok := inputStore.(sops.SingleValueStore); ok {
+		isSingleValueStore = svs.IsSingleValueStore()
+	}
+
+	if isSingleValueStore {
 		// Warn about settings that potentially disable encryption of the single key.
 		if unencryptedSuffix != "" {
 			log.Warn(fmt.Sprintf("Using an unencrypted suffix does not make sense with the input store (the %s store produces one key that should always be encrypted) and will be ignored.", inputStore.Name()))
@@ -2142,7 +2147,7 @@ func getEncryptConfig(c *cli.Context, fileName string, inputStore common.Store,
 	}
 
 	// only supply the default UnencryptedSuffix when EncryptedSuffix, EncryptedRegex, and others are not provided
-	if cryptRuleCount == 0 && !inputStore.IsSingleValueStore() {
+	if cryptRuleCount == 0 && !isSingleValueStore {
 		unencryptedSuffix = sops.DefaultUnencryptedSuffix
 	}
 

sops.go

@@ -726,12 +726,6 @@ type CheckEncrypted interface {
 	HasSopsTopLevelKey(TreeBranch) bool
 }
 
-// SingleValueStore is the interface for determining whether a store uses only
-// one single key and no comments. This is basically identifying the binary store.
-type SingleValueStore interface {
-	IsSingleValueStore() bool
-}
-
 // Store is used to interact with files, both encrypted and unencrypted.
 type Store interface {
 	EncryptedFileLoader
@@ -740,10 +734,16 @@ type Store interface {
 	PlainFileEmitter
 	ValueEmitter
 	CheckEncrypted
-	SingleValueStore
 	Name() string
 }
 
+// SingleValueStore is the interface for determining whether a store uses only
+// one single key and no comments. This is basically identifying the binary store.
+type SingleValueStore interface {
+	Store
+	IsSingleValueStore() bool
+}
+
 // MasterKeyCount returns the number of master keys available
 func (m *Metadata) MasterKeyCount() int {
 	count := 0

stores/dotenv/store.go

@@ -23,10 +23,6 @@ func NewStore(c *config.DotenvStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
-func (store *Store) IsSingleValueStore() bool {
-	return false
-}
-
 func (store *Store) Name() string {
 	return "dotenv"
 }

stores/ini/store.go

@@ -21,10 +21,6 @@ func NewStore(c *config.INIStoreConfig) *Store {
 	return &Store{config: c}
 }
 
-func (store *Store) IsSingleValueStore() bool {
-	return false
-}
-
 func (store *Store) Name() string {
 	return "ini"
 }

stores/json/store.go

@@ -22,10 +22,6 @@ func NewStore(c *config.JSONStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
-func (store *Store) IsSingleValueStore() bool {
-	return false
-}
-
 func (store *Store) Name() string {
 	return "json"
 }

stores/yaml/store.go

@@ -24,10 +24,6 @@ func NewStore(c *config.YAMLStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
-func (store *Store) IsSingleValueStore() bool {
-	return false
-}
-
 func (store *Store) Name() string {
 	return "yaml"
 }