gevico/machina

[Open Source Workshop] Warn when -device is ignored on non-Unix or for unsupported devices

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#85 opened on Apr 25, 2026

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Description

Problem Description

In src/main.rs lines 192-203, the -device handler only enables virtio-net-device on Unix platforms:

"-device" => {
    let val = args.get(i).ok_or("-device requires argument")?;
    #[cfg(unix)]
    if val.starts_with("virtio-net-device,") {
        cli.device_net_raw = Some(val.clone());
    }
    let _ = val;
}

On Windows or other non-Unix platforms, a user passing -device virtio-net-device,netdev=net0 has the device silently dropped with no warning.

Even on Unix platforms, unsupported device names such as virtio-blk-device are silently ignored.

Expected Behavior

  1. On non-Unix platforms, when -device is specified, print a warning explaining that the device type is unsupported on that platform.
  2. On Unix platforms, print a warning for unsupported device names.

Affected Files

  • src/main.rs lines 192-203

Difficulty Notes

This only requires adding conditional branches and eprintln! warnings.

Contributor guide

Research direction
Add conditional compilation to detect non Unix platforms and unsupported device types, then print a warning using eprintln!.
Tech stack
rust
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90