chore(build): compile protobufs with protox (#2122)

* chore(build): compile protobufs with protox

protox is a pure-rust implementation of the protobuf compiler.
Therefore, it can be managed by cargo.

This removes the implicit dependency on protoc being available
in the environment for the build.

* fix(build): replace copypasta in build script

The paths passed to `compile` aren't actually used by the build.
`skip_protoc_run` prevents that.
That's why a clean build succeeds even with this mistake.

However, the paths are passed to a `cargo:rerun-if-changed` directive.
So this mistake would've caused a failed incremental build if the
protobuf definitions were changed.

2 files changed, 17 insertions, 3 deletions

diff --git a/crates/atuin-daemon/Cargo.toml b/crates/atuin-daemon/Cargo.toml
index 3133bcdf..0f3ccb1a 100644
--- a/crates/atuin-daemon/Cargo.toml
+++ b/crates/atuin-daemon/Cargo.toml
@@ -38,4 +38,5 @@ rand.workspace = true
 listenfd = "1.0.1"
 
 [build-dependencies]
+protox = "0.6.0"
 tonic-build = "0.11"
diff --git a/crates/atuin-daemon/build.rs b/crates/atuin-daemon/build.rs
index 95118f6f..37721249 100644
--- a/crates/atuin-daemon/build.rs
+++ b/crates/atuin-daemon/build.rs
@@ -1,4 +1,17 @@
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    tonic_build::compile_protos("./proto/history.proto")?;
-    Ok(())
+use std::{env, fs, path::PathBuf};
+
+use protox::prost::Message;
+
+fn main() -> std::io::Result<()> {
+    let file_descriptors = protox::compile(["history.proto"], ["./proto/"]).unwrap();
+
+    let file_descriptor_path = PathBuf::from(env::var_os("OUT_DIR").expect("OUT_DIR not set"))
+        .join("file_descriptor_set.bin");
+    fs::write(&file_descriptor_path, file_descriptors.encode_to_vec()).unwrap();
+
+    tonic_build::configure()
+        .build_server(true)
+        .file_descriptor_set_path(&file_descriptor_path)
+        .skip_protoc_run()
+        .compile(&["history.proto"], &["."])
 }