Patch to propose to https://github.com/mitchellh/vagrant/issues/1149

linux.rb.patch

--- linux.rb.ori        2012-09-24 19:20:39.094577648 +0200
+++ linux.rb    2012-09-24 19:41:02.079583990 +0200
@@ -42,14 +42,27 @@
         @ui.info I18n.t("vagrant.hosts.linux.nfs_export")
         sleep 0.5

+        # as we are potentially asking for a password when using sudo, the user may appreciate some log info
+
         nfs_cleanup(id)

-        output.split("\n").each do |line|
-          # This should only ask for administrative permission once, even
-          # though its executed in multiple subshells.
-          system(%Q[sudo su root -c "echo '#{line}' >> /etc/exports"])
-        end
+        # printing the content of the modification will not hurt and may save debugging time
+        @logger.info("Patching /etc/exports by appending following content : ")
+        @logger.info(output)
+
+        # now we need to escape some chars to make sure sed will work
+        # we know we make use of double-quotes, parenthesis, and multiple lines. So we are going to handle those cases
+        output = output.gsub("\"", "\\\"")
+        output = output.gsub("(", "\\(")
+        output = output.gsub(")", "\\)")
+        output = output.gsub("\n", "\\\n")
+
+        # printing the sed command will avoid a lot of struggle when debugging
+        sed_command = "sudo sed -e '$a#{output}' -ibak /etc/exports"
+        @logger.debug("Executing sed command : " + sed_command)
+        system(sed_command)

+        @logger.info("Restarting NFS server ...")
         # We run restart here instead of "update" just in case nfsd
         # is not starting
         system("sudo #{@nfs_server_binary} restart")
@@ -87,6 +100,7 @@

         # Use sed to just strip out the block of code which was inserted
         # by Vagrant
+        @logger.info("Cleaning up file /etc/exports ...")
         system("sudo sed -e '/^# VAGRANT-BEGIN: #{id}/,/^# VAGRANT-END: #{id}/ d' -ibak /etc/exports")
       end
     end

vagrant-issue-1149.patch

diff --git a/plugins/hosts/arch/host.rb b/plugins/hosts/arch/host.rb
index fe56f31..1dcf1fc 100644
--- a/plugins/hosts/arch/host.rb
+++ b/plugins/hosts/arch/host.rb
@@ -25,11 +25,14 @@ module VagrantPlugins
 
         nfs_cleanup(id)
 
-        output.split("\n").each do |line|
-          # This should only ask for administrative permission once, even
-          # though its executed in multiple subshells.
-          system(%Q[sudo su root -c "echo '#{line}' >> /etc/exports"])
-        end
+        # now we need to escape some chars to make sure sed will work
+        # we know we make use of double-quotes, parenthesis, and multiple lines. So we are going to handle those cases
+        output = output.gsub("\"", "\\\"")
+        output = output.gsub("(", "\\(")
+        output = output.gsub(")", "\\)")
+        output = output.gsub("\n", "\\\n")
+        sed_command = "sudo sed -e '$a#{output}' -ibak /etc/exports"
+        system(sed_command)
 
         if systemd?
           # Call start to be nice. This will be a no-op if things are
diff --git a/plugins/hosts/bsd/host.rb b/plugins/hosts/bsd/host.rb
index 28c9a62..88c9660 100644
--- a/plugins/hosts/bsd/host.rb
+++ b/plugins/hosts/bsd/host.rb
@@ -49,10 +49,14 @@ module VagrantPlugins
         nfs_cleanup(id)
 
         # Output the rendered template into the exports
-        output.split("\n").each do |line|
-          line = line.gsub('"', '\"')
-          system(%Q[sudo su root -c "echo '#{line}' >> /etc/exports"])
-        end
+        # now we need to escape some chars to make sure sed will work
+        # we know we make use of double-quotes, parenthesis, and multiple lines. So we are going to handle those cases
+        output = output.gsub("\"", "\\\"")
+        output = output.gsub("(", "\\(")
+        output = output.gsub(")", "\\)")
+        output = output.gsub("\n", "\\\n")
+        sed_command = "sudo sed -e '$a#{output}' -ibak /etc/exports"
+        system(sed_command)
 
         # We run restart here instead of "update" just in case nfsd
         # is not starting
diff --git a/plugins/hosts/linux/host.rb b/plugins/hosts/linux/host.rb
index b846d7a..9837714 100644
--- a/plugins/hosts/linux/host.rb
+++ b/plugins/hosts/linux/host.rb
@@ -45,12 +45,15 @@ module VagrantPlugins
 
         nfs_cleanup(id)
 
-        output.split("\n").each do |line|
-          # This should only ask for administrative permission once, even
-          # though its executed in multiple subshells.
-          system(%Q[sudo su root -c "echo '#{line}' >> /etc/exports"])
-        end
-
+        # now we need to escape some chars to make sure sed will work
+        # we know we make use of double-quotes, parenthesis, and multiple lines. So we are going to handle those cases
+        output = output.gsub("\"", "\\\"")
+        output = output.gsub("(", "\\(")
+        output = output.gsub(")", "\\)")
+        output = output.gsub("\n", "\\\n")
+        sed_command = "sudo sed -e '$a#{output}' -ibak /etc/exports"
+        system(sed_command)
+		
         # We run restart here instead of "update" just in case nfsd
         # is not starting
         system("sudo #{@nfs_server_binary} restart")