Use GIT_HASH for network identifier

rust/build.rs

@@ -0,0 +1,11 @@
+use std::process::Command;
+
+// https://stackoverflow.com/a/44407625
+fn main() {
+    let output = Command::new("git")
+        .args(&["rev-parse", "HEAD"])
+        .output()
+        .unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+}

rust/src/net/network_manager.rs

@@ -323,7 +323,7 @@ impl NetworkManager {
     }
 
     fn identifier() -> String {
-        format!("{}@{}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"))
+        format!("{}@{}", env!("CARGO_PKG_NAME"), env!("GIT_HASH"))
     }
 }