Permissions managing iso's with virsh vs libosinfo

[Cameron Showalter]

Hi all,

I'm stuck trying to figure out how to manage iso's in libvirt. It seems
like all `virsh --connect qemu:///system` commands work correctly, but
`virt-install --connect qemu:///system --osinfo detect=on,require=on` will
use libosinfo, which can't read volumes owned by root.

```
(osdict:119) Error creating libosinfo media object: g-io-error-quark:
Failed to open file: Error opening file
/var/lib/libvirt/test/Win10_22H2_English_x64.iso: Permission denied (14)
# (Then the last line the output later on):
ERROR (cli:257) --os-variant/--osinfo OS name is required, but no value was
set or detected.
```

The iso is a libvirt volume, created with `virsh --connect qemu:///system
vol-create-as` to be the same size as the iso, then data uploaded to it
with `virsh --connect qemu:///system vol-upload`. I read somewhere this was
the recommended way since it lets libvirt handle the permissions.

I also saw after that the pool xml supports setting a owner/group ID, so I
tried creating a new pool with those set to my user (1000:1000), and
uploaded a volume to that. When I tried `ls -halt <pool>`, it showed the
volume itself is still owned by root so I still hit the same error. There's
no command in virsh I saw either to upload and respect the pool's
permissions.

Do you know if I'm on the right track at least? Is there a better way to
manage iso and/or permissions? I'm writing a library, so I don't want it to
jump to root for chown/chmod the isos after uploading or anything similar.
(Which is why I was really hopeful with pools supporting uid:gid's, you
don't need sudo to set it in the xml). My user is added to the libvirt
group.

Thanks for your time!
Cameron
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