Return error when ssh key does not exist

pkg/client/tunnel.go

@@ -1,6 +1,7 @@
 package client
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -71,16 +72,21 @@ func makeConfig(info *shared.SSHInfo) (*ssh.ClientConfig, error) {
 		keyPath = expandKeyPath(keyPath)
 	}
 
-	if fileExists(keyPath) {
+	if !fileExists(keyPath) {
+		return nil, errors.New("ssh public key not found at " + keyPath)
+	}
+
+	// Appen public key authentication method
 	key, err := parsePrivateKey(keyPath)
 	if err != nil {
 		return nil, err
 	}
-
 	methods = append(methods, ssh.PublicKeys(key))
-	}
 
+	// Append password authentication method
+	if info.Password != "" {
 		methods = append(methods, ssh.Password(info.Password))
+	}
 
 	cfg := &ssh.ClientConfig{
 		User:    info.User,

pkg/shared/ssh_info.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 )
 
+// SSHInfo contains ssh server configuration
 type SSHInfo struct {
 	Host     string `json:"host,omitempty"`
 	Port     string `json:"port,omitempty"`