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