util.py 文件源码

def _prepare_nspawn_command(chrootPath, user, cmd, nspawn_args=None, env=None, cwd=None):
    cmd_is_list = isinstance(cmd, list)
    if nspawn_args is None:
        nspawn_args = []
    if user:
        # user can be either id or name
        if cmd_is_list:
            cmd = ['-u', str(user)] + cmd
        else:
            raise exception.Error('Internal Error: command must be list or shell=True.')
    elif not cmd_is_list:
        cmd = [cmd]
    nspawn_argv = ['/usr/bin/systemd-nspawn', '-q', '-M', uuid.uuid4().hex, '-D', chrootPath]
    distro_label = distro.linux_distribution(full_distribution_name=False)[0]
    if (distro_label != 'centos') and (distro_label != 'ol') and (distro_label != 'rhel') and (distro_label != 'deskos'):
        # EL7 does not support it (yet). See BZ 1417387
        nspawn_argv += ['-a']
    nspawn_argv.extend(nspawn_args)
    if cwd:
        nspawn_argv.append('--chdir={0}'.format(cwd))
    if env:
        # BZ 1312384 workaround
        env['PROMPT_COMMAND'] = r'printf "\033]0;<mock-chroot>\007"'
        env['PS1'] = r'<mock-chroot> \s-\v\$ '
        for k, v in env.items():
            nspawn_argv.append('--setenv={0}={1}'.format(k, v))
    cmd = nspawn_argv + cmd
    if cmd_is_list:
        return cmd
    else:
        return " ".join(cmd)