folders/rsync: Shellescape guest paths

This allows users to have spaces or other special characters in
destination paths on the guest.

plugins/guests/linux/cap/rsync.rb

@@ -1,3 +1,5 @@
+require "shellwords"
+
 module VagrantPlugins
   module GuestLinux
     module Cap
@@ -11,9 +13,8 @@ module VagrantPlugins
         end
 
         def self.rsync_pre(machine, opts)
-          machine.communicate.tap do |comm|
-            comm.sudo("mkdir -p '#{opts[:guestpath]}'")
-          end
+          guest_path = Shellwords.escape(opts[:guestpath])
+          machine.communicate.sudo("mkdir -p #{guest_path}")
         end
 
         def self.rsync_post(machine, opts)
@@ -21,8 +22,10 @@ module VagrantPlugins
             return
           end
 
+          guest_path = Shellwords.escape(opts[:guestpath])
+
           machine.communicate.sudo(
-            "find '#{opts[:guestpath]}' " +
+            "find #{guest_path} " +
             "'!' -type l -a " +
             "'(' ! -user #{opts[:owner]} -or ! -group #{opts[:group]} ')' -print0 | " +
             "xargs -0 -r chown #{opts[:owner]}:#{opts[:group]}")

plugins/synced_folders/rsync/helper.rb

@@ -1,3 +1,5 @@
+require "shellwords"
+
 require "vagrant/util/platform"
 require "vagrant/util/subprocess"
 
@@ -43,6 +45,9 @@ module VagrantPlugins
           guestpath = machine.guest.capability(:rsync_scrub_guestpath, opts)
         end
 
+        # Shellescape
+        guestpath = Shellwords.escape(guestpath)
+
         if Vagrant::Util::Platform.windows?
           # rsync for Windows expects cygwin style paths, always.
           hostpath = Vagrant::Util::Platform.cygwin_path(hostpath)