agama-project / agama / 15634323747

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feat: initial support for Driver Update Disks (#2466)

A Driver Update Disk is a mechanism that allows to change the
installation media at runtime. It has been a key component for YaST so
we need to keep it around for Agama.

> [!NOTE]
> The current implementation is not complete but we will address the
missing pieces in subsequent pull requests.

## The format

An update can be a simple rpm package or a more complex "dud", created
with the [`mkdud`](https://github.com/openSUSE/mkdud) tool. The "dud"
might contain files to be copied to the installation media, updated or
new packages to be installed, scripts, etc.

## Usage

The URL of a DUD is specified through the kernel boot option `inst.dud`.
You can specify as many updates as you wish. Do not forget the
`rd.neednet` option if you need the network to retrieve the DUD.

```
inst.dud=http://192.168.122.1/agama.dud rd.neednet
```

For debugging purposes, you can add the `rd.break=pre-pivot´ option.

## Testing

If you want to give it a try, check the
[systemsmanagement:Agama:branches:dud
project](https://build.opensuse.org/package/show/systemsmanagement:Agama:branches:dud/agama-installer)
in OBS.

## Tasks

- [x] Add support for RPM packages.
- [x] Improve error handling (especially when something is not found).
- [x] Be more conservative with the space (processing one update at a
time and cleaning up).

## Follow-up

- Add/update kernel modules.
- Run scripts.
- Stop ignoring the "dist"?
- Use the packages repository at installation time.
- Check signatures.

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