Merge pull request #3188 from scampi/issue3124

[rust.git] / build.rs

diff --git a/build.rs b/build.rs
index 2643946236d6c2a52a5172046806a7851ff9ab3c..3f1c412a7afc2518d057bf4e1dba886969e45f7b 100644 (file)
--- a/build.rs
+++ b/build.rs
@@ -11,10 +11,18 @@
 use std::env;
 use std::fs::File;
 use std::io::Write;
-use std::path::PathBuf;
+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"))
@@ -26,12 +34,22 @@ fn main() {
 // 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),
+    match (channel(), commit_hash(), commit_date()) {
+        (channel, Some(hash), Some(date)) => {
+            format!("{} ({} {})", channel, hash.trim_right(), 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"])