feat(sshx): allow to disable SFTP subsystem

pkg/sshx/client.go

@@ -77,8 +77,11 @@ func NewClient(config *Config, options ...Option) (*Client, error) {
 		}
 	}
 
-	if client.SFTP, err = sftp.NewClient(client.SSH); err != nil {
-		return nil, err
+	// Prevent issues with SSH servers that do not permit SFTP.
+	if !client.STFPDisabled {
+		if client.SFTP, err = sftp.NewClient(client.SSH); err != nil {
+			return nil, err
+		}
 	}
 
 	return client, nil

pkg/sshx/options.go

@@ -8,9 +8,10 @@ import (
 
 // Options contains the configuration for an operation.
 type Options struct {
-	Logger  *zerolog.Logger
-	Proxy   *Client
-	Timeout time.Duration
+	Logger       *zerolog.Logger
+	Proxy        *Client
+	Timeout      time.Duration
+	STFPDisabled bool
 }
 
 // Option applies a configuration option
@@ -33,9 +34,10 @@ func GetDefaultOptions() *Options {
 	logger := zerolog.Nop()
 
 	return &Options{
-		Proxy:   nil,
-		Timeout: time.Second * 5,
-		Logger:  &logger,
+		Proxy:        nil,
+		Timeout:      time.Second * 5,
+		Logger:       &logger,
+		STFPDisabled: false,
 	}
 }
 
@@ -63,3 +65,11 @@ func WithTimeout(timeout time.Duration) Option {
 		return nil
 	}
 }
+
+// WithSTFPDisabled allows to disable the SFTP client.
+func WithSTFPDisabled() Option {
+	return func(options *Options) error {
+		options.STFPDisabled = true
+		return nil
+	}
+}