yb 0.5.2

Secure blob storage on a YubiKey
Documentation 
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// SPDX-FileCopyrightText: 2025 - 2026 Frederic Ruget <fred@atlant.is> (GitHub: @douzebis)
//
// SPDX-License-Identifier: MIT

use anyhow::Result;
use clap::Args;
use yb_core::{
    errors::{explain_pcsc, PcscCode},
    HardwarePiv, PivBackend as _, VirtualPiv,
};

#[derive(Args, Debug)]
pub struct ListReadersArgs {}

/// Run list-readers without constructing a Context (works when no YubiKey is connected).
pub fn run(_args: &ListReadersArgs) -> Result<()> {
    let readers = if let Ok(path) = std::env::var("YB_FIXTURE") {
        VirtualPiv::from_fixture(std::path::Path::new(&path))?.list_readers()?
    } else {
        HardwarePiv::new().list_readers()?
    };
    if readers.is_empty() {
        // Same explanation as "no YubiKey found" elsewhere (spec 0025 ยง4);
        // still exit 0, as before.
        eprintln!("No PC/SC readers found.");
        if let Some(fix) = explain_pcsc(&PcscCode::NoReaders).and_then(|e| e.fix) {
            eprintln!("  Try: {fix}.");
        }
    } else {
        for r in &readers {
            println!("{r}");
        }
    }
    Ok(())
}