fail to build SDL client

[SeanGuoXuan]

I fail to build SDL client at step 3: cargo build --release. I got the following error msg:

cargo build --release
Compiling point_viewer_grpc_proto_rust v0.1.0 (file:///home/sean/sean/cartographer_ws/point_cloud_viewer-master/point_viewer_grpc_proto_rust)
Compiling collision v0.18.0
error: failed to run custom build command for point_viewer_grpc_proto_rust v0.1.0 (file:///home/sean/sean/cartographer_ws/point_cloud_viewer-master/point_viewer_grpc_proto_rust)
process didn't exit successfully: /home/sean/sean/cartographer_ws/point_cloud_viewer-master/target/release/build/point_viewer_grpc_proto_rust-d13b2a85d9c9c3b2/build-script-build (exit code: 101)
--- stdout
cargo:rerun-if-changed=point_viewer_proto_rust/src/proto.proto
--- stderr
thread 'main' panicked at 'called Option::unwrap() on a None value', libcore/option.rs:335:21
note: Run with RUST_BACKTRACE=1 for a backtrace.
warning: build failed, waiting for other jobs to finish...
error: build failed

Before building sdl client, I have already installed "rust gRPC protobuf plugin". Under "${HOME}/.cargo/bin", I do see grpc_rust_plugin. Also, PATH variable has "/home/sean/.cargo/bin" section. Can someone give help on my issue?

[SeanGuoXuan]

I think I figure out the resaon:
build.rs is looking for '.git' file as a sign of root dir. However, I download the repro so there is no git file.

while !path.join(".git").exists() {
path = path.parent().unwrap();
}

[SirVer]

That is the likely reason. Would you provide a fix?

[cediy2088]

#cd point_cloud_viewer
#git init .
then recompile