警告：该脚本退出时虽然会尝试自动 umount 分区，但经常会 umount 失败。如果看到 umount 失败的提示，请勿用 rm -rf 删除 rootfs 文件夹，否则 mount 进去的文件夹会被删除。

用于在livecd中切换到已经挂载好的根文件系统去执行修复操作。

使用方法（请根据你的磁盘实际情况修改sdx1和sdx2）：

# 切换到root
sudo -i
# 挂载EFI分区（重要，之前未进行）
mount /dev/sdx1 /boot/efi
# 挂载根文件系统
mount /dev/sdx2 /mnt
# 进入根文件系统
chroot-system /mnt
# 挂载系统需要的其他分区
mount -a
# 查看mount是否成功
mount
# 重建initramfs
update-initramfs -k all -u
# 更新GRUB
update-grub
# 修复并升级软件包
apt install -f
apt update
apt dist-upgrade#!/bin/sh

if [ "$1" = "" ]; then
    chroot
    exit
fi

cd "$1"
mount --bind /dev dev
mount --bind /dev/pts dev/pts
mount --bind /dev/shm dev/shm
mount --bind /dev/snd dev/snd

mount --bind /proc proc
mount --bind /sys sys
mount --bind /run run
mount --bind /tmp tmp

mount --bind /boot/efi boot/efi

if ! [ -f "etc/resolv.conf" ]; then
        rm etc/resolv.conf
        touch etc/resolv.conf
fi
mount --bind /etc/resolv.conf etc/resolv.conf

shift
chroot . "$@"

umount etc/resolv.conf boot/efi tmp run sys proc dev/shm dev/pts dev/snd dev

内容，注意创建文件后要给执行权限才能用：

chmod +x /usr/local/bin/chroot-system

#!/bin/sh

if [ "$1" = "" ]; then
    chroot
    exit
fi

cd "$1"
mount --bind /dev dev
mount --bind /dev/pts dev/pts
mount --bind /dev/shm dev/shm
mount --bind /dev/snd dev/snd

mount --bind /proc proc
mount --bind /sys sys
mount --bind /run run
mount --bind /tmp tmp

mount --bind /boot/efi boot/efi

if ! [ -f "etc/resolv.conf" ]; then
        rm etc/resolv.conf
        touch etc/resolv.conf
fi
mount --bind /etc/resolv.conf etc/resolv.conf

shift
chroot . "$@"

umount etc/resolv.conf boot/efi tmp run sys proc dev/shm dev/pts dev/snd dev