[buildd-tools-devel] Bug#813360: Bug#813360: Overlayfs available on newer Linux kernel only

[Johannes Schauer]

Hi,

Quoting Luca Falavigna (2016-02-01 16:34:11)
> A dumb method could be checking whether the filesystem is listed in
> /proc/filesystems:
> $ cat /proc/filesystems | grep overlay
> nodev overlay
> $
> 
> But I think it will return nothing if overlay module is not loaded via
> modprobe first, and again it's Linux-specific...
> 
> A full check would be like this:
>     if system is Linux:
>         if /proc/filesystem contains overlayfs:
>             overlayfs available
>         else if modprobe overlay:
>             overlayfs available
>         else:
>             overlayfs not available
>     else:
>         overlayfs not available
> 
> ... but my impression it's not 100% error-proof.

I don't think it needs to be. Should there be a system supporting overlayfs but
without /proc/filesystem or where modprobe fails, then the user can still
automatically edit their schroot configuration manually after having run
sbuild-createchroot and then file a bug against sbuild about why the existing
checks failed in their case at which point we can improve the check.

You initially offered a patch - I'd definitely welcome one :)

Thanks!

cheers, josch
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