build.rs

   1 // build.rs
   2 use std::env;
   3 use std::process::Command;
   4
   5 fn main() {
   6     let repoid = match env::var("REPOID") {
   7         Ok(repoid) => repoid,
   8         Err(_) => {
   9             match Command::new("git")
  10                 .args(&["rev-parse", "HEAD"])
  11                 .output()
  12             {
  13                 Ok(output) => {
  14                     String::from_utf8(output.stdout).unwrap()
  15                 }
  16                 Err(err) => {
  17                     panic!("git rev-parse failed: {}", err);
  18                 }
  19             }
  20         }
  21     };
  22
  23     println!("cargo:rustc-env=REPOID={}", repoid);
  24 }