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