纯属瞎玩,可能有风险
1.安装工具

sudo apt install pacman-package-manager arch-install-scripts archlinux-keyring

2.创建要chroot的文件夹

mkdir directory-to-bootstrap

3.挂载chroot文件夹到chroot

sudo mount --bind directory-to-bootstrap directory-to-bootstrap
lsblk可以查看挂载情况

4.配置pacman的镜像源软件库

sudo vim /etc/pacman.conf
往里面加入,也可以是arch默认的pacman.conf配置文件

[options]

HoldPkg = pacman glibc

Architecture = auto

CheckSpace

SigLevel = Required DatabaseOptional
LocalFileSigLevel = Optional

[core]
Include = /etc/pacman.d/mirrorlist

[extra-testing]

Include = /etc/pacman.d/mirrorlist

[extra]
Include = /etc/pacman.d/mirrorlist

再加入镜像源

sudo vim /etc/pacman.d/mirrorlist
加入

Server = https://mirrors.tuna.tsinghua.edu.cn/archlinux/$repo/os/$arch
5.安装arch到directory-to-bootstrap
先初始化GnuPG 密钥环

sudo pacman-key --init
再初始化 GnuPG 密钥环并导入密钥

sudo pacman-key --populate
最后安装arch

sudo pacstrap base directory-to-bootstrap
6.chroot到directory-to-bootstrap

sudo arch-chroot directory-to-bootstrap