refactor(bare): enhance security and performance optimizations

- Remove unnecessary sorting in advertise_refs for deterministic output
- Add path traversal detection and validation in bare_dir construction
- Implement symlink resolution checks to prevent security vulnerabilities
- Refactor cache system with CRC validation and improved metrics
- Integrate repo-specific cache invalidation using indexed keys
- Add comprehensive unit tests for commit operations and diff functionality
- Move configuration constants to centralized config module
- Optimize string operations in disk cache random value generation
- Enhance license detection algorithm with cleaner matching logic
- Streamline argument processing in various git operations
- Update dependencies including crc32fast and flate2 for performance
- Add signal handling capability to tokio runtime configuration

server/pack.rs

@@ -115,7 +115,6 @@ impl pack_service_server::PackService for GitksService {
                         .upload_pack(tokio_stream::wrappers::ReceiverStream::new(rx))
                         .await?;
                     let out = super::bridge_server_stream(resp.into_inner());
-                    // Create a dummy cancel token for the forwarded stream
                     let cancel_token = tokio_util::sync::CancellationToken::new();
                     let cancel_guard = cancel_token.drop_guard();
                     return Ok(tonic::Response::new(
@@ -190,7 +189,6 @@ impl pack_service_server::PackService for GitksService {
                         .receive_pack(tokio_stream::wrappers::ReceiverStream::new(rx))
                         .await?;
                     let out = super::bridge_server_stream(resp.into_inner());
-                    // Create a dummy cancel token for the forwarded stream
                     let cancel_token = tokio_util::sync::CancellationToken::new();
                     let cancel_guard = cancel_token.drop_guard();
                     return Ok(tonic::Response::new(
@@ -310,7 +308,6 @@ impl pack_service_server::PackService for GitksService {
                     return Ok(tonic::Response::new(ReceiverStream::new(rx)));
                 }
 
-                // Cache miss: execute pack-objects and tee to cache
                 tracing::info!(%repo, digest = %digest, "pack-objects cache miss");
                 let stream = gb.pack_objects(inner).await?;
                 let tee_stream = pc.tee_pack_stream(&digest, stream);