Allow SSH commands to ignore exit status

lib/vagrant/ssh.rb

@@ -149,8 +149,12 @@ module Vagrant
       # the actual `exec!` implementation, except that this
       # implementation also reports `:exit_status` to the block if given.
       def exec!(command, options=nil, &block)
+        options = {
+          :error_check => true
+        }.merge(options || {})
+
         block ||= Proc.new do |ch, type, data|
-          check_exit_status(data, command, options) if type == :exit_status
+          check_exit_status(data, command, options) if type == :exit_status && options[:error_check]
 
           ch[:result] ||= ""
           ch[:result] << data if [:stdout, :stderr].include?(type)

lib/vagrant/systems/linux.rb

@@ -66,7 +66,7 @@ module Vagrant
         logger.info "Preparing system for rsync..."
         vm.ssh.upload!(StringIO.new(render_rsync), config.vm.rsync_script)
         ssh.exec!("sudo chmod +x #{config.vm.rsync_script}")
-        ssh.exec!("sudo rm #{config.vm.rsync_crontab_entry_file}")
+        ssh.exec!("sudo rm #{config.vm.rsync_crontab_entry_file}", :error_check => false)
       end
 
       #-------------------------------------------------------------------

test/vagrant/systems/linux_test.rb

@@ -59,7 +59,7 @@ class LinuxSystemTest < Test::Unit::TestCase
     end
 
     should "remove old crontab entries file" do
-      @ssh.expects(:exec!).with("sudo rm #{@mock_env.config.vm.rsync_crontab_entry_file}")
+      @ssh.expects(:exec!).with("sudo rm #{@mock_env.config.vm.rsync_crontab_entry_file}", :error_check => false)
       @instance.prepare_rsync(@ssh)
     end