42 lines
1.3 KiB
Rust
42 lines
1.3 KiB
Rust
use std::path::PathBuf;
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use std::{env, fs, io};
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fn main() {
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let git_sha = read_git_sha().unwrap();
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println!("cargo:rustc-env={}={}", "BUILD_SHA", git_sha);
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println!(
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"cargo:rustc-env=BUILD_TARGET={}",
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std::env::var("TARGET").unwrap()
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);
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}
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fn read_git_sha() -> io::Result<String> {
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let mut repo_path = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
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let mut git_path;
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loop {
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git_path = repo_path.join(".git");
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if git_path.exists() {
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break;
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} else {
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assert!(repo_path.pop());
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}
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}
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let git_head_path = git_path.join("HEAD");
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println!("cargo:rerun-if-changed={}", git_head_path.to_str().unwrap());
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let mut head_content = fs::read_to_string(&git_head_path)?;
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assert!(head_content.ends_with("\n"));
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head_content.pop();
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if head_content.starts_with("ref: ") {
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// We're on a branch. Read the SHA from the ref file.
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head_content.replace_range(0.."ref: ".len(), "");
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let ref_filename = git_path.join(&head_content);
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println!("cargo:rerun-if-changed={}", ref_filename.to_str().unwrap());
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fs::read_to_string(&ref_filename)
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} else {
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// We're not on a branch. The `HEAD` file itself contains the sha.
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assert_eq!(head_content.len(), 40);
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Ok(head_content)
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}
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}
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