Ubuntu Studio: We're out of space

[Steve Langasek]

On Wed, Mar 23, 2022 at 10:28:06PM -0700, Erich Eickmeyer wrote:

> At the time, it seemed like a good idea, as both Plasma and Xfce were
> around the same size in disk space, and we also decided, Ubuntu Studio
> isn't tied to its desktop environment.

> The problem that I'm seeing is that the ISO 9660 spec, the standard on
> which all of our ISO images are built, has a hard limit of 4096MB per file
> size.  In our case, the squashfs file size is exceeding that.  This is
> resulting in failed builds.

No, it isn't?  https://cdimage.ubuntu.com/ubuntustudio/dvd/

There have been multiple successful image builds over the past several days.

If this is all because of the 'OVERSIZED' warning, I've addressed that on
IRC.  The header on https://cdimage.ubuntu.com/ubuntustudio/dvd/current/
explains further:

  Warning: This image is oversized (which is a bug) and will not fit onto a
  single-sided single-layer DVD.  However, you may still test it using a
  larger USB drive or a virtual machine.

If Ubuntu Studio decide they don't care about the image fitting on a DVD, we
can simply raise the size limit.  But in that case, I don't think we should
call the image build itself a 'dvd' any more; and I also think that in short
order (but not necessarily for 22.04) we should stop building this as a
hybrid image since it's no longer practical to use it on optical media.  If
it's going to only be usable on a USB stick, then let's fix how we build it
and avoid all the indirection that exists ONLY so that it can be used on
optical media.

> HOWEVER, and this is why I'm CCing the Release Team and ubuntu-devel@,
> there is another ISO format that works for DVD: ISO 13346, aka UDF.  This
> allows for a virtually unlimited filesize, although I've seen anecdotal
> mentions of 1024GB (1TB).  This would be preferable, and on behalf of
> Ubuntu Studio, we request this switch if able, or even an alternative.  I
> realize this is short notice prior to beta,

I've established that it's not actually necessary here, but for the record
it would be completely impossible to make that switch in time for beta.  We
have never built a UDF-format image, none of the tools are installed on the
image build server to support this format, we have certainly never done a
hybrid image with UDF (which means the easiest implementation would be a
*non*-hybrid image, so if it's not a hybrid image why not just do a USB
image instead? see above), and various parts of our installer-specific
initramfs code assumes iso9660.

> It seems that Ubuntu Kylin shares our plight.

The only shared plight is that both flavors currently have images that are
oversized for the limits that have been declared in the code...

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                   https://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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