// Package envexec provides utility function to run program in restricted environments // through container and cgroup. // // # Cmd // // Cmd defines single program to run, including copyin files before exec, run the program and copy // out files after exec // // ## Single // // Single defines single Cmd with Environment and Cgroup Pool // // ## Group // // Group defines multiple Cmd with Environment and Cgroup Pool, together with Pipe mapping between // different Cmd package envexec