-extern crate walkdir;
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
use std::env;
use std::fs::File;
use std::io::Write;
-use std::path::Path;
+use std::path::{Path, PathBuf};
use std::process::Command;
-use walkdir::WalkDir;
-
fn main() {
- let out_dir = env::var("OUT_DIR").unwrap();
- let dest_path = Path::new(&out_dir).join("git_info.rs");
- let mut f = File::create(&dest_path).unwrap();
+ // 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");
+ }
- writeln!(f,
- "const COMMIT_HASH: Option<&'static str> = {:?};",
- git_head_sha1())
- .unwrap();
- writeln!(f,
- "const WORKTREE_CLEAN: Option<bool> = {:?};",
- git_tree_is_clean())
+ 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_right(), date)
+ }
+ _ => String::new(),
+ }
+}
- // cargo:rerun-if-changed requires one entry per individual file.
- for entry in WalkDir::new("src") {
- let entry = entry.unwrap();
- println!("cargo:rerun-if-changed={}", entry.path().display());
+fn channel() -> String {
+ if let Ok(channel) = env::var("CFG_RELEASE_CHANNEL") {
+ channel
+ } else {
+ "nightly".to_owned()
}
}
-// Returns `None` if git is not available.
-fn git_head_sha1() -> Option<String> {
+fn commit_hash() -> Option<String> {
Command::new("git")
- .arg("rev-parse")
- .arg("--short")
- .arg("HEAD")
+ .args(&["rev-parse", "--short", "HEAD"])
.output()
.ok()
- .and_then(|o| String::from_utf8(o.stdout).ok())
- .map(|mut s| {
- let len = s.trim_right().len();
- s.truncate(len);
- s
- })
+ .and_then(|r| String::from_utf8(r.stdout).ok())
}
-// Returns `None` if git is not available.
-fn git_tree_is_clean() -> Option<bool> {
+fn commit_date() -> Option<String> {
Command::new("git")
- .arg("status")
- .arg("--porcelain")
- .arg("--untracked-files=no")
+ .args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
.output()
.ok()
- .map(|o| o.stdout.is_empty())
+ .and_then(|r| String::from_utf8(r.stdout).ok())
}