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use std::process::Command;
fn main() {
read_git_info().ok();
}
fn run(args: &[&str]) -> Result<String, std::io::Error> {
let out = Command::new(args[0]).args(&args[1..]).output()?;
Ok(String::from_utf8(out.stdout).unwrap().trim().to_string())
}
/// This method reads info from Git, namely tags, branch, and revision
fn read_git_info() -> Result<(), std::io::Error> {
// The exact tag for the current commit, can be empty when
// the current commit doesn't have an associated tag
let exact_tag = run(&["git", "describe", "--abbrev=0", "--tags", "--exact-match"])?;
println!("cargo:rustc-env=GIT_EXACT_TAG={}", exact_tag);
// The last available tag, equal to exact_tag when
// the current commit is tagged
let last_tag = run(&["git", "describe", "--abbrev=0", "--tags"])?;
println!("cargo:rustc-env=GIT_LAST_TAG={}", last_tag);
// The current branch name
let branch = run(&["git", "rev-parse", "--abbrev-ref", "HEAD"])?;
println!("cargo:rustc-env=GIT_BRANCH={}", branch);
// The current git commit hash
let rev = run(&["git", "rev-parse", "HEAD"])?;
let rev_short = rev.get(..12).unwrap_or_default();
println!("cargo:rustc-env=GIT_REV={}", rev_short);
// To access these values, use:
// env!("GIT_EXACT_TAG")
// env!("GIT_LAST_TAG")
// env!("GIT_BRANCH")
// env!("GIT_REV")
Ok(())
}
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