openethereum/crates/util/version/build.rs

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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.
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// OpenEthereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
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// OpenEthereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
extern crate rustc_version;
extern crate toml;
extern crate vergen;
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use std::{env, fs::File, io::Write, path::Path};
use vergen::{vergen, OutputFns};
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const ERROR_MSG: &'static str = "Failed to generate metadata files";
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fn main() {
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vergen(OutputFns::all()).expect(ERROR_MSG);
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let version = rustc_version::version().expect(ERROR_MSG);
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create_file(
"meta.rs",
format!(
"
/// Returns compiler version.
pub fn rustc_version() -> &'static str {{
\"{version}\"
}}
",
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version = version,
),
);
}
fn create_file(filename: &str, data: String) {
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let out_dir = env::var("OUT_DIR").expect(ERROR_MSG);
let dest_path = Path::new(&out_dir).join(filename);
let mut f = File::create(&dest_path).expect(ERROR_MSG);
f.write_all(data.as_bytes()).expect(ERROR_MSG);
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}