openethereum/util/version/build.rs

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Rust
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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
// Parity Ethereum 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.
// Parity Ethereum 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
// along with Parity Ethereum. 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;
use std::fs::File;
use std::io::Write;
use std::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() {
vergen(OutputFns::all()).expect(ERROR_MSG);
let version = rustc_version::version().expect(ERROR_MSG);
let cargo: toml::Value = toml::from_str(include_str!("./Cargo.toml")).expect(ERROR_MSG);
let track = cargo["package"]["metadata"]["track"].as_str().expect("'track' has to be a string!");
create_file("meta.rs", format!("
/// This versions track.
#[allow(unused)]
pub const TRACK: &str = {track:?};
/// Returns compiler version.
pub fn rustc_version() -> &'static str {{
\"{version}\"
}}
",
track = track,
version = version,
));
}
fn create_file(filename: &str, data: String) {
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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}