feat: --version output now includes Git commit

Signed-off-by: Lars Wirzenius <liw@liw.fi>

build.rs

@@ -0,0 +1,27 @@
+use std::process::Command;
+
+fn main() {
+    // Set a build-time `GIT_HEAD` env var which includes the commit id;
+    // such that we can tell which code is running.
+    let hash = Command::new("git")
+        .arg("rev-parse")
+        .arg("--short")
+        .arg("HEAD")
+        .output()
+        .ok()
+        .and_then(|output| {
+            if output.status.success() {
+                String::from_utf8(output.stdout).ok()
+            } else {
+                None
+            }
+        })
+        .unwrap_or_else(|| String::from("unknown"));
+
+    println!("cargo:rustc-env=GIT_HEAD={hash}");
+    println!(
+        "cargo:rustc-env=VERSION={}@{hash}",
+        env!("CARGO_PKG_VERSION")
+    );
+    println!("cargo:rustc-rerun-if-changed=.git/HEAD");
+}

src/bin/radicle-native-ci.rs

@@ -55,7 +55,7 @@ fn fallible_main() -> Result<bool, EngineError> {
     } else {
         for arg in args.iter() {
             match arg.as_str() {
-                "--version" => println!("{} {}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION")),
+                "--version" => println!("{} {}", env!("CARGO_PKG_NAME"), env!("VERSION")),
                 "--show-config" => {
                     let engine = Engine::new()?;
                     println!("{}", engine.config().as_json());