fix: use proto from env if present

libs/realtime-entity/build.rs

@@ -1,11 +1,14 @@
 use std::process::Command;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-  let protoc_path = protoc_bin_vendored::protoc_bin_path().expect("protoc bin path");
-  let protoc_path_str = protoc_path.to_str().expect("protoc path to str");
+  // If the `PROTOC` environment variable is set, don't use vendored `protoc`
+  std::env::var("PROTOC").map(|_| ()).unwrap_or_else(|_| {
+    let protoc_path = protoc_bin_vendored::protoc_bin_path().expect("protoc bin path");
+    let protoc_path_str = protoc_path.to_str().expect("protoc path to str");
 
-  // Set the `PROTOC` environment variable to the path of the `protoc` binary.
-  std::env::set_var("PROTOC", protoc_path_str);
+    // Set the `PROTOC` environment variable to the path of the `protoc` binary.
+    std::env::set_var("PROTOC", protoc_path_str);
+  });
 
   prost_build::Config::new()
     .out_dir("src/")

shell.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  packages = with pkgs; [
+    pkg-config rustup
+    grpc-tools openssl
+  ];
+  shellHook = ''
+    export PROTOC=$(which protoc)
+  '';
+}