guests/linux: don't show SMB password in plaintext on error [GH-3203]

CHANGELOG.md

@@ -18,6 +18,8 @@ BUG FIXES:
   - guests/fedora: Fix hostname setting. [GH-3382]
   - guests/fedora: Support predictable network interface names for
       public/private networks. [GH-3207]
+  - guests/linux: If SMB folder mounting fails, the password will no
+      longer be shown in plaintext in the output. [GH-3203]
   - providers/hyperv: Check for PowerShell features. [GH-3398]
   - synced\_folders/smb: Only set the chmod properly by default on Windows
       if it isn't already set. [GH-3394]

plugins/guests/linux/cap/mount_smb_shared_folder.rb

@@ -61,8 +61,11 @@ module VagrantPlugins
 
             attempts += 1
             if attempts > 10
+              command = mount_commands.join("\n")
+              command.gsub!(options[:smb_password], "PASSWORDHIDDEN")
+
               raise Vagrant::Errors::LinuxMountFailed,
-                command: mount_commands.join("\n")
+                command: command
             end
 
             sleep 2