ble: Add device information service

build.rs

@@ -9,6 +9,7 @@ fn main() -> std::io::Result<()> {
         println!("cargo:rustc-link-arg=-Tlinkall.x");
     }
 
+    // compile protobuf definition to rust code
     let descriptor_path =
         std::path::PathBuf::from(env::var("OUT_DIR").unwrap()).join("proto_descriptor.bin");
 
@@ -17,6 +18,27 @@ fn main() -> std::io::Result<()> {
         .compile_well_known_types()
         .compile_protos(&["docs/c_its-messages.proto"], &["docs/"])?;
 
+    // get git revision
+    println!("cargo:rustc-rerun-if-changed=.git/HEAD");
+
+    // length:
+    // - tag name:      6-8 chars (v0.1.0 to v1.23.42)
+    // - offset+hash:   0-12 chars (up to 99 commits from tag + 8 char hash)
+    // - SUM:           6-20
+    let git_output = std::process::Command::new("git")
+        .args(["describe", "--tags", "--match", "v*", "--always"])
+        .output()
+        .unwrap();
+    assert!(
+        git_output.stderr.is_empty(),
+        "{}",
+        String::from_utf8(git_output.stderr).unwrap()
+    );
+    println!(
+        "cargo:rustc-env=GIT_REVISION={}",
+        String::from_utf8(git_output.stdout).unwrap()
+    );
+
     Ok(())
 }