Make Read return name/value/info, but no all details.

Add Secret ID to Read struct

internal/juju/secrets.go

@@ -52,7 +52,10 @@ type ReadSecretInput struct {
 }
 
 type ReadSecretOutput struct {
-	SecretDetails apisecrets.SecretDetails
+	SecretId string
+	Name     string
+	Value    map[string]string
+	Info     string
 }
 
 type UpdateSecretInput struct {
@@ -133,7 +136,10 @@ func (c *secretsClient) ReadSecret(input *ReadSecretInput) (ReadSecretOutput, er
 	}
 
 	return ReadSecretOutput{
-		SecretDetails: results[0],
+		SecretId: results[0].Metadata.URI.String(),
+		Name:     results[0].Metadata.Label,
+		Value:    results[0].Value.EncodedValues(),
+		Info:     results[0].Metadata.Description,
 	}, nil
 }
 
@@ -185,6 +191,8 @@ func (c *secretsClient) UpdateSecret(input *UpdateSecretInput) error {
 				return typedError(err)
 			}
 		}
+	} else {
+		return errors.New("updating secrets by name is not supported")
 	}
 
 	return nil