Create build to fill environment variables git (commit and date)

1 files changed, 21 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..52cbd9f
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,21 @@
+use std::process::Command;
+
+fn main() {
+    let git_hash = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
+        .unwrap_or_else(|_| "unknown".into());
+
+    let git_date = Command::new("git")
+        .args(["show", "-s", "--format=%cI", "HEAD"])
+        .output()
+        .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
+        .unwrap_or_else(|_| "unknown".into());
+
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+    println!("cargo:rustc-env=BUILD_DATE={}", git_date);
+
+    println!("cargo:rerun-if-changed=.git/HEAD");
+    println!("cargo:rerun-if-changed=.git/refs/heads");
+}