late_command not late enough?

[Alex Waite <alexqw85@gmail.com>]

Hello,

I am attempting (and failing) to achieve these final two tasks for my 
preseeded deployment of Wheezy to our computation cluster.

1) Add an NFS mount to fstab. partman seems to be unaware that NFS exists.
2) Setup network bonding. netcfg does not support bonding (and does not 
intend to).

My current approach is to use late_command to fix both of these 
problems. For fstab, I tried to simply append /etc/fstab; however, 
partman runs all if its scripts *after* late_command is executed and 
overwrites my change.

I tried to completely replace my /etc/network/interfaces file; however, 
netcfg runs all of its scripts *after* late_command and clobbers my 
changes. This is detailed in bug #709017.

I briefly attempted to create my own script 
(/usr/lib/finish-install.d/89true_late_command) to run after almost 
everything else, but -- as of yet -- I am unable to get debian-installer 
to execute it.

Any help and/or insight is most welcome.

---Alex