Re: qemu test with start_vm fails

[Henning Schild <henning.schild@siemens.com>]

Am Thu, 29 Nov 2018 13:20:17 +0100
schrieb Andreas Reichel <andreas.reichel.ext@siemens.com>:

> On Wed, Nov 28, 2018 at 08:34:58PM +0300, Maxim Yu. Osipov wrote:
> > Hi Andreas,
> > 
> > I would suggest to double check your statements before blaming that
> > something is not working
> >   
> Hi,
> 
> well unfortunately I was correct. There is an error in Isar:
> the offline cache is included in the root file system :)
> 
> There is a /base-apt in the resulting .ext4.img.
> 
> This way I got a rootfs of 720 MB with no free space, despite the
> 64M extra space. (file system overhead).

I think we now have a fix because we do not include the cache into the
image anymore. But that actually just hides the bug we have in the ext4
class, next time someone builds a 700M image the same thing will happen
again.

So we will also need a patch that prepares the ext4 for that case.
Things that could be done
 - mkfs -m 1 (instead of default 5)
 - multiply the size with an ext4 specific overhead factor
 - df assert the EXTRA while still mounted
 - double check what wic is doing, maybe use wic instead of ext4

Henning

> In your CI you obviously do not use the offline cache feature,
> that's why in CI this did not happen.
> 
> vG
> Andreas