rd.py 文件源码

def contain(command, image_name, image_dir, container_id, container_dir):
    linux.unshare(linux.CLONE_NEWNS)  # create a new mount namespace
    # TODO: switch to a new UTS namespace, change hostname to container_id
    # HINT: use linux.sethostname()

    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)