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build.rs
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build.rs
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use chrono::{DateTime, Utc};
use std::env;
use std::process::Command;
fn main() {
// Generate the default 'cargo:' instruction output
println!("cargo:rerun-if-changed=build.rs");
// get timestamp
let now = match env::var("SOURCE_DATE_EPOCH") {
Ok(val) => DateTime::from_timestamp(val.parse::<i64>().unwrap(), 0).unwrap(),
Err(_) => Utc::now(),
};
println!("cargo:rustc-env=BUILD_TIMESTAMP={}", now.to_rfc3339());
// get rust target triple from TARGET env
println!(
"cargo:rustc-env=BUILD_TARGET={}",
std::env::var("TARGET").unwrap()
);
// get git commit
let command = Command::new("git").args(["rev-parse", "HEAD"]).output();
let commit = match command {
Ok(output) => String::from_utf8(output.stdout).unwrap(),
// if error, e.g. build from source with git repo, just show empty string
Err(_) => "".to_string(),
};
println!("cargo:rustc-env=GIT_COMMIT={}", commit);
}