Ignore encryption selection options for binary store (and warn when they are used).

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

cmd/sops/main.go

@@ -1023,7 +1023,7 @@ func main() {
 				}
 				svcs := keyservices(c)
 
-				encConfig, err := getEncryptConfig(c, fileNameOverride, nil)
+				encConfig, err := getEncryptConfig(c, fileNameOverride, inputStore, nil)
 				if err != nil {
 					return toExitError(err)
 				}
@@ -1369,7 +1369,7 @@ func main() {
 					}
 				} else {
 					// File doesn't exist, edit the example file instead
-					encConfig, err := getEncryptConfig(c, fileName, nil)
+					encConfig, err := getEncryptConfig(c, fileName, inputStore, nil)
 					if err != nil {
 						return toExitError(err)
 					}
@@ -1908,7 +1908,7 @@ func main() {
 		}
 		var output []byte
 		if isEncryptMode {
-			encConfig, err := getEncryptConfig(c, fileNameOverride, config)
+			encConfig, err := getEncryptConfig(c, fileNameOverride, inputStore, config)
 			if err != nil {
 				return toExitError(err)
 			}
@@ -1996,7 +1996,7 @@ func main() {
 				output, err = edit(opts)
 			} else {
 				// File doesn't exist, edit the example file instead
-				encConfig, err := getEncryptConfig(c, fileNameOverride, config)
+				encConfig, err := getEncryptConfig(c, fileNameOverride, inputStore, config)
 				if err != nil {
 					return toExitError(err)
 				}
@@ -2050,7 +2050,7 @@ func main() {
 	}
 }
 
-func getEncryptConfig(c *cli.Context, fileName string, optionalConfig *config.Config) (encryptConfig, error) {
+func getEncryptConfig(c *cli.Context, fileName string, inputStore common.Store, optionalConfig *config.Config) (encryptConfig, error) {
 	unencryptedSuffix := c.String("unencrypted-suffix")
 	encryptedSuffix := c.String("encrypted-suffix")
 	encryptedRegex := c.String("encrypted-regex")
@@ -2090,6 +2090,33 @@ func getEncryptConfig(c *cli.Context, fileName string, optionalConfig *config.Co
 		}
 	}
 
+	if inputStore.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()))
+		}
+		if encryptedSuffix != "" {
+			log.Warn(fmt.Sprintf("Using an encrypted 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()))
+		}
+		if encryptedRegex != "" {
+			log.Warn(fmt.Sprintf("Using an encrypted regex 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()))
+		}
+		if unencryptedRegex != "" {
+			log.Warn(fmt.Sprintf("Using an unencrypted regex 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()))
+		}
+		if encryptedCommentRegex != "" {
+			log.Warn(fmt.Sprintf("Using an encrypted comment regex does not make sense with the input store (the %s store never produces comments) and will be ignored.", inputStore.Name()))
+		}
+		// Do not warn about unencryptedCommentRegex and macOnlyEncrypted since they cannot have any effect.
+		unencryptedSuffix = ""
+		encryptedSuffix = ""
+		encryptedRegex = ""
+		unencryptedRegex = ""
+		encryptedCommentRegex = ""
+		unencryptedCommentRegex = ""
+		macOnlyEncrypted = false
+	}
+
 	cryptRuleCount := 0
 	if unencryptedSuffix != "" {
 		cryptRuleCount++
@@ -2115,7 +2142,7 @@ func getEncryptConfig(c *cli.Context, fileName string, optionalConfig *config.Co
 	}
 
 	// only supply the default UnencryptedSuffix when EncryptedSuffix, EncryptedRegex, and others are not provided
-	if cryptRuleCount == 0 {
+	if cryptRuleCount == 0 && !inputStore.IsSingleValueStore() {
 		unencryptedSuffix = sops.DefaultUnencryptedSuffix
 	}
 

sops.go

@@ -726,6 +726,12 @@ 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
@@ -734,6 +740,8 @@ type Store interface {
 	PlainFileEmitter
 	ValueEmitter
 	CheckEncrypted
+	SingleValueStore
+	Name() string
 }
 
 // MasterKeyCount returns the number of master keys available

stores/dotenv/store.go

@@ -23,6 +23,14 @@ func NewStore(c *config.DotenvStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
+func (store *Store) IsSingleValueStore() bool {
+	return false
+}
+
+func (store *Store) Name() string {
+	return "dotenv"
+}
+
 // LoadEncryptedFile loads an encrypted file's bytes onto a sops.Tree runtime object
 func (store *Store) LoadEncryptedFile(in []byte) (sops.Tree, error) {
 	branches, err := store.LoadPlainFile(in)

stores/ini/store.go

@@ -21,6 +21,14 @@ func NewStore(c *config.INIStoreConfig) *Store {
 	return &Store{config: c}
 }
 
+func (store *Store) IsSingleValueStore() bool {
+	return false
+}
+
+func (store *Store) Name() string {
+	return "ini"
+}
+
 func (store Store) encodeTree(branches sops.TreeBranches) ([]byte, error) {
 	iniFile := ini.Empty(ini.LoadOptions{AllowNonUniqueSections: true})
 	iniFile.DeleteSection(ini.DefaultSection)

stores/json/store.go

@@ -22,12 +22,29 @@ func NewStore(c *config.JSONStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
+func (store *Store) IsSingleValueStore() bool {
+	return false
+}
+
+func (store *Store) Name() string {
+	return "json"
+}
+
 // BinaryStore handles storage of binary data in a JSON envelope.
 type BinaryStore struct {
 	store  Store
 	config config.JSONBinaryStoreConfig
 }
 
+// The binary store uses a single key ("data") to store everything.
+func (store *BinaryStore) IsSingleValueStore() bool {
+	return true
+}
+
+func (store *BinaryStore) Name() string {
+	return "binary"
+}
+
 func NewBinaryStore(c *config.JSONBinaryStoreConfig) *BinaryStore {
 	return &BinaryStore{config: *c, store: *NewStore(&config.JSONStoreConfig{
 		Indent: c.Indent,

stores/yaml/store.go

@@ -24,6 +24,14 @@ func NewStore(c *config.YAMLStoreConfig) *Store {
 	return &Store{config: *c}
 }
 
+func (store *Store) IsSingleValueStore() bool {
+	return false
+}
+
+func (store *Store) Name() string {
+	return "yaml"
+}
+
 func (store Store) appendCommentToList(comment string, list []interface{}) []interface{} {
 	if comment != "" {
 		for _, commentLine := range strings.Split(comment, "\n") {