fn main() {
let hash = std::process::Command::new("git")
.args(["rev-parse", "--short", "HEAD"])
.output()
.ok()
.and_then(|o| {
if o.status.success() {
String::from_utf8(o.stdout).ok()
} else {
None
}
})
.map(|s| s.trim().to_string())
.unwrap_or_else(|| "unknown".to_string());
println!("cargo:rustc-env=GIT_HASH={hash}");
println!("cargo:rerun-if-changed=.git/HEAD");
println!("cargo:rerun-if-changed=.git/refs/heads");
}