Re: Bug#35568: apt keeps complaining about dpkg's post-invoke

[Jason Gunthorpe <jgg@ualberta.ca>]

On Mon, 5 Apr 1999, Linh Dang wrote:

> Package: apt
> Version: 0.3.3
> 
> when I install with apt, I keep getting this error message after dpkg
> finished installing everything:
> 
>  mount: /usr is busy
>  E: Problem executing scripts DPkg::Post-Invoke 'mount -o remount,ro /usr'
>  E: Sub-process returned an error code
> 
> My /etc/apt/apt.conf is:
> 
>  DPkg 
>  {
>      // Auto re-mounting of a readonly /usr
>      Pre-Invoke {"mount -o remount,rw /usr";};
>      Post-Invoke {"mount -o remount,ro /usr";};
>  }
>                            
> I type 'mount -o remount,ro /usr', the mount is successful.

I'll need your help to determine why APT cannot remount /usr, I need to
know what program is keeping the partition busy.

Can you use lsof > /tmp/blah as the post-invoke script and look to see
what could be keeping things busy? Can you try adding a long sleep before
the unmount? AFAIK apt itself does not do anything to the /usr partition
so I am at a loss why the kernel would refuse to unmount it.

Maybe you need a shell script that sleeps, unmounts and repeats untill the
parition can by unmounted, and maybe you need a sync in there as well??

Jason