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Re: [Libguestfs] [PATCH] builder: templates: For RHEL, CentOS >= 7 and all Fedora, default to GPT.

On Tue, Nov 07, 2017 at 02:57:50PM +0100, Pino Toscano wrote:
> On Tuesday, 17 October 2017 17:35:51 CET Richard W.M. Jones wrote:
> > The immediate issue is with Fedora/ppc64 and /ppc64le which currently
> > use extended partitions, breaking the virt-builder ā€˜--sizeā€™ parameter,
> > eg:
> > 
> >   $ virt-builder --arch ppc64le fedora-26 --size 20G
> >   ...
> >   [  21.6] Resizing (using virt-resize) to expand the disk to 20.0G
> >   virt-resize: error: /dev/sda5: partition not found in the source disk image
> >   (this error came from '--expand' option on the command line).  Try running
> >   this command: virt-filesystems --partitions --long -a /var/tmp/vbf67b8c.img
> > 
> > However more generally MBR is broken and should die.  GPT is supported
> > by all modern virtual bootloaders, so just default to it.
> > 
> > Notes:
> > 
> > * This is different from mandating a UEFI bootloader.
> > 
> > * I am not planning to rebuild any existing images except the
> >   F26 ppc64 & ppc64le ones.
> > ---
> The reasons above suggest me that we should switch all the distros (in the
> libguestfs.org repository) to GPT, not just the ones in this patch.

I agree, although that's a bit more work as I'd have to work out how
to actually do that for the other distros.

This change fixes a concrete problem with Fedora/ppc64 which affects
us right now (with an open bug IIRC).

I'm not proposing to rebuild old images (except Fedora 26/ppc64*)
in any case.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch

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