Example provided in classic image definition doesn't build

[Damian Zaręba]

OS: Ubuntu Unity 24.04
Ubuntu-image version: 3.4+snap1

When using example provided under this link: https://github.com/canonical/ubuntu-image/blob/main/internal/imagedefinition/README.rst

Image doesn't build at all.

Error:

```yaml
Error: yaml: unmarshal errors:
  line 8: cannot unmarshal !!map into string
```

When editing this like from

```yaml
kernel:
  name: linux-raspi
```

to:
```yaml
kernel: linux-raspi
```

Then ubuntu-image returns following error:

```
WARNING: rootfs.sources-list-deb822 was not set. Please explicitly set the format desired for sources list in your image definition.
WARNING: rootfs.sources-list-deb822 is set to false. The deprecated format will be used to manage sources list. Please if possible adopt the new format.
Error: Schema validation failed: [ModelAssertion: Does not match format 'uri']
```

[Paul Mars (upils)]

Hey Damian,

Thank you for reporting the bug. I confirm it appears we completely forgot to keep this example up-to-date.

I will fix this. Meanwhile, feel free to look at https://git.launchpad.net/ubuntu-images/tree/ to get working and up-to-date examples to help you get started.

You can also read the current doc https://canonical-subiquity.readthedocs-hosted.com/en/latest/reference/ubuntu-image.html

[Paul Mars (upils)]

This is now fixed, see https://github.com/canonical/ubuntu-image/pull/220

[Damian Zaręba (khazakar)]

Thanks, it went further but still cannot build it locally. Output in attachments.

[Paul Mars (upils)]

That is definitely a different issue because if you use the configuration from the (now current) documentation, it should build fine. To be sure I tested it on my machine and it worked.

Were you able to reproduce this error? Did you make any change in the image definition?

[Damian Zaręba (khazakar)]

I used configuration straight from documentation. Now it works fine, I was missing... git command. Then debootstrap complained about missing root privileges, but sudo did the trick... until not working chroot.

Got this error:
```
W: Failure trying to run: chroot "/tmp/ubuntu-image-1253d431-7842-4612-90c5-38e443233758/chroot" /bin/true
W: See /tmp/ubuntu-image-1253d431-7842-4612-90c5-38e443233758/chroot/debootstrap/debootstrap.log for details
```
When trying to find that log, it's not there:
```
> cat /tmp/ubuntu-image-1253d431-7842-4612-90c5-38e443233758/chroot/debootstrap/debootstrap.log
cat: /tmp/ubuntu-image-1253d431-7842-4612-90c5-38e443233758/chroot/debootstrap/debootstrap.log: No such file or directory
```

[Paul Mars (upils)]

Is your Ubuntu Unity 24.04 a fresh install or did you upgrade? I would like to reproduce so I will install a fresh ubuntu unity 24.04 VM.

I think you were the first one to run the tool on a host without git, so we never noticed it was missing from the snap. We should add that.

We should also make it more clear that the tool should always be run with sudo or as root because underlying tools require it.

[Damian Zaręba (khazakar)]

1. It was a fresh install, no upgrade :)
2. I was just simply trying to hack stuff around to build slightly customized image on a fresh PC not meant initially for development - I'm glad that it will be worked on.
3. Sure, it would be great.

BTW. I just would want to appreciate your patience and willingness to help my poor soul :)