VCS module mangles path in nested NFS mount.

[jinks]

When I cd into a deeply nested NFS mount the current path is somehow broken via the VCS module.

[root@client] ~ # showmount -e server
Export list for server:
/mnt/storage/share/Pictures     192.168.0.99
/mnt/storage/share/Programs     192.168.0.99
/mnt/storage/share/Downloads    192.168.0.99
/mnt/storage/share/Books        192.168.0.99
/mnt/storage/share/Clips        192.168.0.99
/mnt/storage/share/Music        192.168.0.99
/mnt/storage                    192.168.0.99

(The nested exports are because those are BTRFS subvolumes which require manually setting fsids)

[root@client] ~ # cd /mnt/server/share/Music/X-Mas

[root@client] /mnt/server/share/Music/X-Mas # /bin/ls
bin  boot  checkout  dev  esp  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

[root@client] /mnt/server/share/Music/X-Mas # /bin/ls $PWD
'Die Stars Der Hitparade Feiern Weihnachten (2009)'  'RTL Weihnachten 2008'  'The Ultimate Christmas Music Collection'  'Various Artists'
'Frank Schöbel'                                      'Roland Kaiser'         'Top Christmas Songs of All Time'          'von Wilfried'

You can clearly see the difference between ls and ls $PWD, which should not exist.

Removing the VCS module from :prompt:grml:left:setup fixes this, but I can't determine why it happens in the first place.