/usr/share/gocode/src/google.golang.org/grpc/interop/ is in golang-google-grpc-dev 1.0.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/google.golang.org/grpc/interop/client/
/usr/share/gocode/src/google.golang.org/grpc/interop/client/client.go
/usr/share/gocode/src/google.golang.org/grpc/interop/client/testdata/
/usr/share/gocode/src/google.golang.org/grpc/interop/client/testdata/ca.pem
/usr/share/gocode/src/google.golang.org/grpc/interop/client/testdata/server1.key
/usr/share/gocode/src/google.golang.org/grpc/interop/client/testdata/server1.pem
/usr/share/gocode/src/google.golang.org/grpc/interop/grpc_testing/
/usr/share/gocode/src/google.golang.org/grpc/interop/grpc_testing/test.pb.go
/usr/share/gocode/src/google.golang.org/grpc/interop/grpc_testing/test.proto
/usr/share/gocode/src/google.golang.org/grpc/interop/server/
/usr/share/gocode/src/google.golang.org/grpc/interop/server/server.go
/usr/share/gocode/src/google.golang.org/grpc/interop/server/testdata/
/usr/share/gocode/src/google.golang.org/grpc/interop/server/testdata/ca.pem
/usr/share/gocode/src/google.golang.org/grpc/interop/server/testdata/server1.key
/usr/share/gocode/src/google.golang.org/grpc/interop/server/testdata/server1.pem
/usr/share/gocode/src/google.golang.org/grpc/interop/test_utils.go