edgy->feisty upgrades for people with nfs mounts and without nfs-common

[Matthias Klose]

Michael Vogt schrieb:
> Hi,
> 
> Julian Edwards discovered a interessting upgrade scenario the other
> day. 
> 
> On a stock edgy system without portmap or nfs-common it is possible to
> nfs mount a directory (also it takes some time for the kernel to
> timeout on portmap). Now this does no longer work on feisty, the
> kernel complains that it can't read the nfs superblock. So on the new
> feisty system the user will assume that something broke during the
> upgrade.
> 
> I would like to ask for opinions how we should deal with this
> situation in general and in the release-upgrader in particular. I see
> the following options if a nfs mount is detected in /etc/fstab:
> 
> 1. automatically install nfs-common (opens a port)
> 2. ask the user if he wants to install nfs-common (brings up a
>    additional question during the upgrade)
> 3. use some sort of notification (post-upgrade hook) to inform the
>    user 
> 4. just do nothing and assume people who can do nfs mounts can deal
>    with the situation 
> 
> Input would be appreciated. I personally like option number one, but
> this raises the security issue with a open port.

I would like to see option 1 for feisty; OOo tries to lock files, which does
fail on a nfs mount if nfs-common is not installed. 2 and 3 look ok as well, but
4 is just causing problems to unaware users.

  Matthias