1. 安装qemu工具

1.1 Ubuntu系统

sudo apt install qemu-user-static

2. 常见使用

2.1 下载对应架构的根文件并解压

2.2 将对应架构的qemu-aarch64-static拷贝

2.3 运行下列终端即可进入

chroot "${PWD}/rootfs" /bin/bash

3. 常用脚本

3.1 脚本模板

function create_qemu_env(){
if [ ! -f "/usr/bin/qemu-aarch64-static" ]; then
echo "please install qemu-aarch64-static"
exit 1
fi
LDK_ROOTFS_DIR="${LDK_DIR}/rootfs"
cp /usr/bin/qemu-aarch64-static ${LDK_ROOTFS_DIR}/usr/bin/
chmod 755 ${LDK_ROOTFS_DIR}/usr/bin/qemu-aarch64-static
mv "${LDK_ROOTFS_DIR}/etc/resolv.conf" "${LDK_ROOTFS_DIR}/etc/resolv.conf.saved"
cp /etc/resolv.conf "${LDK_ROOTFS_DIR}/etc/"
mount /sys ${LDK_ROOTFS_DIR}/sys -o bind
mount /proc ${LDK_ROOTFS_DIR}/proc -o bind
mount /dev ${LDK_ROOTFS_DIR}/dev -o bind
mount /dev/pts ${LDK_ROOTFS_DIR}/dev/pts -o bind
mount $(pwd) ${LDK_ROOTFS_DIR}/mnt -o bind;
}

function clean_qemu_env(){
echo "Cleaning up virtual env"
LDK_ROOTFS_DIR="${LDK_DIR}/rootfs"
mountpoint -q "${LDK_ROOTFS_DIR}/sys" && umount "${LDK_ROOTFS_DIR}/sys"
mountpoint -q "${LDK_ROOTFS_DIR}/proc" && umount "${LDK_ROOTFS_DIR}/proc"
mountpoint -q "${LDK_ROOTFS_DIR}/dev/shm" && umount "${LDK_ROOTFS_DIR}/dev/shm"
mountpoint -q "${LDK_ROOTFS_DIR}/dev/pts" && umount "${LDK_ROOTFS_DIR}/dev/pts"
mountpoint -q "${LDK_ROOTFS_DIR}/dev" && umount "${LDK_ROOTFS_DIR}/dev"
mountpoint -q "${LDK_ROOTFS_DIR}/mnt" && umount "${LDK_ROOTFS_DIR}/mnt"

if [ -f "${LDK_ROOTFS_DIR}/etc/resolv.conf.saved" ]; then
mv "${LDK_ROOTFS_DIR}/etc/resolv.conf.saved" "${LDK_ROOTFS_DIR}/etc/resolv.conf"
fi
rm -f "${LDK_ROOTFS_DIR}/usr/bin/qemu-aarch64-static"

}

3.2 脚本使用方法

function do_run_cmd(){
    trap clean_qemu_env EXIT
    local cmd="$*"
    echo "do_run_cmd, cmd: $cmd"
    create_qemu_env
    # 显示将要执行的完整命令
    local full_command="LC_ALL=C chroot \"${LDK_DIR}/rootfs\" /bin/bash -c \"$cmd\""
    echo "Executing command: $full_command"
    if ! eval $full_command; then
        echo "ERROR: do_run_cmd failed!"
        exit 1
    else
        echo "do_run_cmd successful!"
        clean_qemu_env
        trap - EXIT
    fi
}