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use std::env;
use std::fs::File;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::process::Command;
fn main() {
// Only check .git/HEAD dirty status if it exists - doing so when
// building dependent crates may lead to false positives and rebuilds
if Path::new(".git/HEAD").exists() {
println!("cargo:rerun-if-changed=.git/HEAD");
}
println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
File::create(out_dir.join("commit-info.txt"))
.unwrap()
.write_all(commit_info().as_bytes())
.unwrap();
}
// Try to get hash and date of the last commit on a best effort basis. If anything goes wrong
// (git not installed or if this is not a git repository) just return an empty string.
fn commit_info() -> String {
match (channel(), commit_hash(), commit_date()) {
(channel, Some(hash), Some(date)) => format!("{} ({} {})", channel, hash.trim_end(), date),
_ => String::new(),
}
}
fn channel() -> String {
if let Ok(channel) = env::var("CFG_RELEASE_CHANNEL") {
channel
} else {
"nightly".to_owned()
}
}
fn commit_hash() -> Option<String> {
Command::new("git")
.args(&["rev-parse", "--short", "HEAD"])
.output()
.ok()
.and_then(|r| String::from_utf8(r.stdout).ok())
}
fn commit_date() -> Option<String> {
Command::new("git")
.args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
.output()
.ok()
.and_then(|r| String::from_utf8(r.stdout).ok())
}
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