66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::env;
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use std::fs::File;
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use std::io::Write;
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use std::path::{Path, PathBuf};
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use std::process::Command;
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fn main() {
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// Only check .git/HEAD dirty status if it exists - doing so when
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// building dependent crates may lead to false positives and rebuilds
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if Path::new(".git/HEAD").exists() {
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println!("cargo:rerun-if-changed=.git/HEAD");
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}
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println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
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let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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File::create(out_dir.join("commit-info.txt"))
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.unwrap()
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.write_all(commit_info().as_bytes())
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.unwrap();
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}
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// Try to get hash and date of the last commit on a best effort basis. If anything goes wrong
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// (git not installed or if this is not a git repository) just return an empty string.
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fn commit_info() -> String {
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match (channel(), commit_hash(), commit_date()) {
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(channel, Some(hash), Some(date)) => format!("{} ({} {})", channel, hash.trim_end(), date),
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_ => String::new(),
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}
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}
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fn channel() -> String {
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if let Ok(channel) = env::var("CFG_RELEASE_CHANNEL") {
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channel
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} else {
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"nightly".to_owned()
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}
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}
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fn commit_hash() -> Option<String> {
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Command::new("git")
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.args(&["rev-parse", "--short", "HEAD"])
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.output()
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.ok()
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.and_then(|r| String::from_utf8(r.stdout).ok())
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}
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fn commit_date() -> Option<String> {
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Command::new("git")
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.args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
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.output()
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.ok()
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.and_then(|r| String::from_utf8(r.stdout).ok())
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}
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