GH-4201: Added rsync__showoutput to display rsync output to console

CHANGELOG.md

@@ -40,6 +40,8 @@ IMPROVEMENTS:
   - synced\_folders/nfs: Won't use `sudo` to write to /etc/exports if there
       are write privileges. [GH-2643]
   - synced\_folders/smb: Credentials from one SMB will be copied to the rest. [GH-4675]
+  - synced\_filders/rsync: Added rsync__showoutput option to echo rsync output
+      to console [GH-4201]
 
 BUG FIXES:
 

plugins/synced_folders/rsync/helper.rb

@@ -121,13 +121,23 @@ module VagrantPlugins
           machine.ui.info(I18n.t(
             "vagrant.rsync_folder_excludes", excludes: excludes.inspect))
         end
+        if opts.include?(:showoutput)
+          machine.ui.info(I18n.t("vagrant.rsync_showingoutput"));
+        end
 
         # If we have tasks to do before rsyncing, do those.
         if machine.guest.capability?(:rsync_pre)
           machine.guest.capability(:rsync_pre, opts)
         end
 
-        r = Vagrant::Util::Subprocess.execute(*(command + [command_opts]))
+        if opts.include?(:showoutput)
+	  command_opts[:notify] = [ :stdout, :stderr ];
+          r = Vagrant::Util::Subprocess.execute(
+            *(command + [command_opts])) { |io_name,data| machine.ui.info("rsync[#{io_name}] -> #{data}") }
+        else
+          r = Vagrant::Util::Subprocess.execute(*(command + [command_opts]))
+        end
+
         if r.exit_code != 0
           raise Vagrant::Errors::RSyncError,
             command: command.join(" "),

templates/locales/en.yml

@@ -212,6 +212,7 @@ en:
       The provider ('%{provider}') for the machine '%{name}' is
       using a proxy machine. RSync will sync to this proxy
       instead of directly to the environment itself.
+    rsync_showing_output: "Showing rsync output..."
     rsync_ssh_password: |-
       The machine you're rsyncing folders to is configured to use
       password-based authentication. Vagrant can't script rsync to automatically

website/docs/source/v2/synced-folders/rsync.html.md

@@ -62,6 +62,10 @@ The rsync synced folder type accepts the following options:
   pattern. By default, the ".vagrant/" directory is excluded. We recommend
   excluding revision control directories such as ".git/" as well.
 
+* `rsync__showoutput` (boolean) - If true, then the output from the rsync
+  process will be echoed to the console. The output of rsync is subject
+  to rsync__args of course. By default, this is false.
+
 ## Example
 
 The following is an example of using RSync to sync a folder: