Revert "Always clear NFS exports for the VM booting [GH-529]"

This reverts commit 70705d2861.

lib/vagrant/action/vm/nfs.rb

@@ -60,19 +60,19 @@ module Vagrant
         # task.
         def extract_folders
           # Load the NFS enabled shared folders
-          @folders = {}
-          @env[:vm].config.vm.shared_folders.each do |name, opts|
+          @folders = @env[:vm].config.vm.shared_folders.inject({}) do |acc, data|
+            key, opts = data
+
             if opts[:nfs]
               # Duplicate the options, set the hostpath, and set disabled on the original
               # options so the ShareFolders middleware doesn't try to mount it.
-              opts = opts.dup
-              opts[:hostpath] = File.expand_path(opts[:hostpath], @env[:root_path])
+              acc[key] = opts.dup
+              acc[key][:hostpath] = File.expand_path(opts[:hostpath], @env[:root_path])
               opts[:disabled] = true
-              @folders[key] = opts
             end
-          end
 
-          @folders
+            acc
+          end
         end
 
         # Prepares the settings for the NFS folders, such as setting the

lib/vagrant/hosts/bsd.rb

@@ -56,10 +56,14 @@ module Vagrant
         return if !File.exist?("/etc/exports")
 
         retryable(:tries => 10, :on => TypeError) do
-          # Use sed to just strip out the block of code which was inserted
-          # by Vagrant, and restart NFS.
-          system("sudo sed -e '/^# VAGRANT-BEGIN: #{id}/,/^# VAGRANT-END: #{id}/ d' -ibak /etc/exports")
-          system(@nfs_restart_command)
+          system("cat /etc/exports | grep 'VAGRANT-BEGIN: #{id}' > /dev/null 2>&1")
+
+          if $?.to_i == 0
+            # Use sed to just strip out the block of code which was inserted
+            # by Vagrant, and restart NFS.
+            system("sudo sed -e '/^# VAGRANT-BEGIN: #{id}/,/^# VAGRANT-END: #{id}/ d' -ibak /etc/exports")
+            system(@nfs_restart_command)
+          end
         end
       end
     end

lib/vagrant/hosts/linux.rb

@@ -52,10 +52,13 @@ module Vagrant
 
       def nfs_cleanup(id)
         return if !File.exist?("/etc/exports")
+        system("cat /etc/exports | grep 'VAGRANT-BEGIN: #{id}' > /dev/null 2>&1")
 
-        # Use sed to just strip out the block of code which was inserted
-        # by Vagrant
-        system("sudo sed -e '/^# VAGRANT-BEGIN: #{id}/,/^# VAGRANT-END: #{id}/ d' -ibak /etc/exports")
+        if $?.to_i == 0
+          # Use sed to just strip out the block of code which was inserted
+          # by Vagrant
+          system("sudo sed -e '/^# VAGRANT-BEGIN: #{id}/,/^# VAGRANT-END: #{id}/ d' -ibak /etc/exports")
+        end
       end
     end
   end