use std::process::Command;
fn main() {
let git_hash = if std::env::var("SOURCE_DATE_EPOCH").is_ok() {
"unknown".to_string()
} else {
Command::new("git")
.args(["rev-parse", "--short", "HEAD"])
.output()
.ok()
.and_then(|out| String::from_utf8(out.stdout).ok())
.map(|s| s.trim().to_owned())
.unwrap_or_else(|| "unknown".to_owned())
};
println!("cargo:rustc-env=GIT_HASH={git_hash}");
println!("cargo:rerun-if-changed=.git/HEAD");
}