From 8d06588e8faa88b95c8f8981a505b5f985dc244f Mon Sep 17 00:00:00 2001
From: Graham Hayes <graham.hayes@hp.com>
Date: Mon, 13 Jul 2015 14:29:14 +0100
Subject: [PATCH] Limit p9 tag to 31 bytes

Libvirt p9 file system passthrough requires the tag be less than
31 bytes. Using the mount point as the tag can easily exceed this.

Fixes #323
---
 lib/vagrant-libvirt/cap/mount_p9.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/vagrant-libvirt/cap/mount_p9.rb b/lib/vagrant-libvirt/cap/mount_p9.rb
index 274edb1..586c6ea 100644
--- a/lib/vagrant-libvirt/cap/mount_p9.rb
+++ b/lib/vagrant-libvirt/cap/mount_p9.rb
@@ -1,3 +1,4 @@
+require "digest/md5"
 require "vagrant/util/retryable"
 
 module VagrantPlugins
@@ -16,7 +17,7 @@ module VagrantPlugins
             machine.communicate.sudo("mkdir -p #{expanded_guest_path}")
 
             # Mount
-            mount_tag = name.dup
+            mount_tag = Digest::MD5.new.update(name).to_s[0,31]
 
             mount_opts="-o trans=virtio"
             mount_opts += ",access=#{opts[:owner]}" if opts[:owner]