rd.py 文件源码

def contain(command, image_name, image_dir, container_id, container_dir,
            cpu_shares, memory, memory_swap):
    _setup_cpu_cgroup(container_id, cpu_shares)

    # TODO: similarly to the CPU cgorup, add Memory cgroup support here
    #       setup memory -> memory.limit_in_bytes,
    #       memory_swap -> memory.memsw.limit_in_bytes if they are not None

    linux.sethostname(container_id)  # Change hostname to container_id

    linux.mount(None, '/', None, linux.MS_PRIVATE | linux.MS_REC, None)

    new_root = create_container_root(
        image_name, image_dir, container_id, container_dir)
    print('Created a new root fs for our container: {}'.format(new_root))

    _create_mounts(new_root)

    old_root = os.path.join(new_root, 'old_root')
    os.makedirs(old_root)
    linux.pivot_root(new_root, old_root)

    os.chdir('/')

    linux.umount2('/old_root', linux.MNT_DETACH)  # umount old root
    os.rmdir('/old_root') # rmdir the old_root dir

    os.execvp(command[0], command)