Merge pull request #2068 from topecongiro/issue-2067

[rust.git] / build.rs

diff --git a/build.rs b/build.rs
index 3e6d051d9b1d67eda791b4bd418f290954105074..42d9330f75d8507194c995b90de0aaa7d7d17515 100644 (file)
--- a/build.rs
+++ b/build.rs
@@ -1,4 +1,4 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// 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.
 //
@@ -8,18 +8,43 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// Build script. Just copies default.toml from the src to the target dir.
-
 use std::env;
-use std::path::{Path, PathBuf};
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::Command;
+
 
 fn main() {
-    let in_file = Path::new("src/default.toml");
+    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();
+}
 
-    let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
-    let mut out_file = PathBuf::new();
-    out_file.push(manifest_dir);
-    out_file.push("default.toml");
+// 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 (commit_hash(), commit_date()) {
+        (Some(hash), Some(date)) => format!(" ({} {})", hash.trim_right(), date),
+        _ => String::new(),
+    }
+}
+
+fn commit_hash() -> Option<String> {
+    Command::new("git")
+        .args(&["rev-parse", "--short", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|r| String::from_utf8(r.stdout).ok())
+}
 
-    std::fs::copy(in_file, out_file).unwrap();
+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())
 }