agama-project / agama / 13699602539

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feat: add support for some YaST-like URLs (#2118)

## Problem

Agama [Transfer's
API](https://github.com/agama-project/agama/blob/master/rust/agama-lib/src/utils/transfer.rs)
does not understand [YaST-specific
URLs](https://github.com/yast/yast-installation/blob/master/doc/url.md).

It is impossible to handle URLs like `usb://OEMDRV/autoinst.xml`,
`device:///autoinst.xml`, etc.

> [!NOTE]
> It might not cover 100% of the old API cases, but we are working
towards that.

## Solution

This PR aims to add partial support for these URLs. The following
schemes are supported: `device:`, `usb:`, `label:`, `HD:`, `DVD:` and
`cd:`. Support for well-known URLs (e.g., `file:`, `http:`, `https:`,
`ftp:`, `nfs:`, etc.) is still implemented using CURL.

> [!WARNING]
> `agama download` now requires specifying a DESTINATION file (instead
of writing to stdout). Agama uses stdout to tell where it is searching.

## Testing

- Added a new unit test
- Tested manually

37 of 156 new or added lines in 8 files covered. (23.72%)

20015 of 27608 relevant lines covered (72.5%)

42.48 hits per line