Init is called for container init process it will check if pid == 1, otherwise it is noop Init will do infinite loop on socket commands, and exits when at socket close, use it in init function.

PathEnv defines path environment variable for the container init process.

Builder builds instance of container environment.

ExecveParam is parameters to run process inside container.

OpenCmd correspond to a single open syscall.

SymbolicLink defines symlinks to be created after mount.

CredGenerator generates uid / gid credential used by container to isolate process and file system access.

Environment holds single progrem containerized environment.