From 25f2a46fc3e50c882cd518244bb49d44d01ca442 Mon Sep 17 00:00:00 2001
From: Jonathan Davies <jpds@protonmail.com>
Date: Fri, 10 Mar 2023 11:40:58 +0000
Subject: [PATCH] rpc/system_metrics.rs: Added rustversion label to
 garage_build_info metric.

---
 Cargo.lock                | 1 +
 src/rpc/system_metrics.rs | 8 ++++----
 src/util/Cargo.toml       | 3 +++
 src/util/build.rs         | 8 ++++++++
 src/util/version.rs       | 4 ++++
 5 files changed, 20 insertions(+), 4 deletions(-)
 create mode 100644 src/util/build.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4fddd215..981af01d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1309,6 +1309,7 @@ dependencies = [
  "opentelemetry",
  "rand",
  "rmp-serde",
+ "rustc_version",
  "serde",
  "serde_json",
  "sha2 0.10.6",
diff --git a/src/rpc/system_metrics.rs b/src/rpc/system_metrics.rs
index 83f5fa97..af81b71f 100644
--- a/src/rpc/system_metrics.rs
+++ b/src/rpc/system_metrics.rs
@@ -31,10 +31,10 @@ impl SystemMetrics {
 				.u64_value_observer("garage_build_info", move |observer| {
 					observer.observe(
 						1,
-						&[KeyValue::new(
-							"version",
-							garage_util::version::garage_version(),
-						)],
+						&[
+							KeyValue::new("rustversion", garage_util::version::rust_version()),
+							KeyValue::new("version", garage_util::version::garage_version()),
+						],
 					)
 				})
 				.with_description("Garage build info")
diff --git a/src/util/Cargo.toml b/src/util/Cargo.toml
index abeccbbd..9c182fd6 100644
--- a/src/util/Cargo.toml
+++ b/src/util/Cargo.toml
@@ -47,6 +47,9 @@ hyper = "0.14"
 
 opentelemetry = { version = "0.17", features = [ "rt-tokio", "metrics", "trace" ] }
 
+[build-dependencies]
+rustc_version = "0.4.0"
+
 [dev-dependencies]
 mktemp = "0.5"
 
diff --git a/src/util/build.rs b/src/util/build.rs
new file mode 100644
index 00000000..a4e955b8
--- /dev/null
+++ b/src/util/build.rs
@@ -0,0 +1,8 @@
+use rustc_version::version;
+
+fn main() {
+	// Acquire the version of Rust used to compile, this is added as a label to
+	// the garage_build_info metric.
+	let v = version().unwrap();
+	println!("cargo:rustc-env=RUSTC_VERSION={v}");
+}
diff --git a/src/util/version.rs b/src/util/version.rs
index b515dccc..2b2ea271 100644
--- a/src/util/version.rs
+++ b/src/util/version.rs
@@ -26,3 +26,7 @@ pub fn init_version(version: &'static str) {
 pub fn init_features(features: &'static [&'static str]) {
 	FEATURES.store(Some(Arc::new(features)));
 }
+
+pub fn rust_version() -> &'static str {
+	env!("RUSTC_VERSION")
+}