librpm 0.2.1

RPM Package Manager library binding with an idiomatic Rust API
Documentation 
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/*
 * Copyright (C) RustRPM Developers
 *
 * Licensed under the Mozilla Public License Version 2.0
 * Fedora-License-Identifier: MPLv2.0
 * SPDX-2.0-License-Identifier: MPL-2.0
 * SPDX-3.0-License-Identifier: MPL-2.0
 *
 * This is free software.
 * For more information on the license, see LICENSE.
 * For more information on free software, see <https://www.gnu.org/philosophy/free-sw.en.html>.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
 */

// Forward librpm constant availability as cfg flags.
//
// librpm-sys (links = "rpm") scans its bindgen output and emits Cargo metadata
// for every rpmTag / rpmSigTag constant found in the system headers.  Cargo
// surfaces these as DEP_RPM_<KEY> environment variables here.  We re-export each
// one as a rustc-cfg so that enum variants in tag.rs can be gated with e.g.
// #[cfg(has_rpmtag_payloadsha3_256)], allowing the crate to build against older
// librpm versions that lack newer constants.
fn main() {
    for (key, _) in std::env::vars() {
        if let Some(name) = key.strip_prefix("DEP_RPM_") {
            let cfg = format!("has_{}", name.to_lowercase());
            println!("cargo:rustc-check-cfg=cfg({cfg})");
            println!("cargo:rustc-cfg={cfg}");
        }
    }
}