From 7fdd1b71ebf9fab9c44705fe42f4ff973f93a57e Mon Sep 17 00:00:00 2001
From: "hinto.janai" <hinto.janai@protonmail.com>
Date: Thu, 7 Dec 2023 21:15:41 -0500
Subject: [PATCH] add `build.rs` for `COMMIT` environment variable

---
 cuprate/build.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 cuprate/build.rs

diff --git a/cuprate/build.rs b/cuprate/build.rs
new file mode 100644
index 0000000..f0e8751
--- /dev/null
+++ b/cuprate/build.rs
@@ -0,0 +1,15 @@
+// This sets the git `COMMIT` environment variable.
+fn main() {
+	println!("cargo:rerun-if-changed=../.git/refs/heads/");
+
+	let output = std::process::Command::new("git")
+		.arg("rev-parse")
+		.arg("HEAD")
+		.output()
+		.unwrap();
+
+	let commit = String::from_utf8(output.stdout).unwrap();
+	assert!(commit.len() >= 40);
+
+	println!("cargo:rustc-env=COMMIT={commit}");
+}