Buildroot 打包文件系统流程跟踪

/*********************************************************************************
 *                  Buildroot 打包文件系统流程跟踪
 * 说明：
 *     之前在使用Buildroot过程中，发现其自身生成的rootfs.tar.bz2文件系统可以正常运行
 * 但自己使用命令打包的文件系统就有问题，于是跟一下其脚本运行的输出信息，原来使用到
 * 了fakeroot来模拟root权限。
 *
 *                                              2017-10-11 深圳 南山平山村 曾剑锋
 ********************************************************************************/

一、输出信息分析：
    >>>   Finalizing target directory
    rm -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/glib-2.0/schemas/*.xml /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/glib-2.0/schemas/*.dtd
    /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/glib-compile-schemas /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/share/glib-2.0/schemas --targetdir=/home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/glib-2.0/schemas
    No schema files found: doing nothing.
    PYTHONPATH="/home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/python3.5/sysconfigdata/:/home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/python3.5/site-packages/" /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/python3.5 support/scripts/pycompile.py /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/python3.5
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/python3.5 -name '*.py' -print0 | xargs -0 --no-run-if-empty rm -f
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/python3.5 -name '*.opt-1.pyc' -print0 -o -name '*.opt-2.pyc' -print0 | xargs -0 --no-run-if-empty rm -f
    # 创建etc目录
    mkdir -p /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc
    # 创建hostname目录
    echo "AplexOS" > /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/hostname
    # 使用sed对文件进行操作
    /bin/sed -i -e '$a 127.0.1.1	AplexOS' -e '/^127.0.1.1/d' /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/hosts
    mkdir -p /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc
    # 登录前欢迎语句
    echo "Welcome to AplexOS" > /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/issue
    # 创建network目录
    mkdir -p /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/network/
    # 设置loopback设备，这也就是为什么interfaces如果这里不进行修改，每次都会被修改的原因
    ( echo "# interface file auto-generated by buildroot"; echo ; echo "auto lo"; echo "iface lo inet loopback"; ) > /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/network/interfaces
    # 设置eth0设备
    ( echo ; echo "auto eth0"; echo "iface eth0 inet static"; echo "     address 192.168.1.202"; echo "     netmask 255.255.255.0"; echo "     broadcast 0.0.0.0"; echo "     gateway 192.168.1.1"; ) >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/network/interfaces
    /usr/bin/install -m 0755 -D package/skeleton//nfs_check /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/network/nfs_check
    # 生成root账户及密码
    /bin/sed -i -e s,^root:[^:]*:,root:"`/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/mkpasswd -m "md5" "aplex"`":, /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/shadow
    # debug port
    /bin/sed -i -e '/# GENERIC_SERIAL$/s~^.*#~console::respawn:/sbin/getty -L  console 0 vt100 #~' /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/inittab
    # 修改inittab文件
    /bin/sed -i -e '/^#.*-o remount,rw /$/s~^#+~~' /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/inittab
    rm -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/locales.nopurge
    for i in C en_US locale-archive; do echo $i >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/locales.nopurge; done
    for dir in /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/locale; do for langdir in $dir/*; do if [ -e "${langdir}" ]; then grep -qx "${langdir##*/}" /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/locales.nopurge || rm -rf $langdir; fi done; done
    if [ -d /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/X11/locale ]; then for lang in C en_US; do if [ -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/X11/locale/$lang/XLC_LOCALE ]; then echo "$lang/XLC_LOCALE: $lang"; fi done > /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/X11/locale/locale.dir; fi
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/include /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/aclocal 
        /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/pkgconfig /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/pkgconfig 
        /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/cmake /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/cmake
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/{lib,share}/ -name '*.cmake' -print0 | xargs -0 rm -f
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/lib/ /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/lib/ /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/libexec/ 
        ( -name '*.a' -o -name '*.la' ) -print0 | xargs -0 rm -f
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/gdb
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/bash-completion
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/zsh
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/man /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/man
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/info /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/info
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/doc /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/doc
    rm -rf /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share/gtk-doc
    rmdir /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/usr/share 2>/dev/null || true
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target -type f ( -perm /111 -o -name '*.so*' ) -not ( -name 'libpthread*.so*' -o -name 'ld-*.so*' -o -name '*.ko' ) -print0 | xargs -0 /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/arm-buildroot-linux-gnueabi-strip --remove-section=.comment --remove-section=.note 2>/dev/null || true
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/lib/ -type f -name 'libpthread*.so*' | 
        xargs -r /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/arm-buildroot-linux-gnueabi-strip --remove-section=.comment --remove-section=.note --strip-debug
    find /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/lib/ -type f -name 'ld-*.so*' | 
        xargs -r /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/arm-buildroot-linux-gnueabi-strip --remove-section=.comment --remove-section=.note --strip-debug
    # 检查一些库的存在
    test -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/ld.so.conf && 
        { echo "ERROR: we shouldn't have a /etc/ld.so.conf file"; exit 1; } || true
    test -d /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/ld.so.conf.d && 
        { echo "ERROR: we shouldn't have a /etc/ld.so.conf.d directory"; exit 1; } || true
    mkdir -p /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc
    ( 
        echo "NAME=Buildroot"; 
        echo "VERSION=2017.02.3"; 
        echo "ID=buildroot"; 
        echo "VERSION_ID=2017.02.3"; 
        echo "PRETTY_NAME="Buildroot 2017.02.3"" 
    ) >  /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/etc/os-release
    >>>   Generating root filesystem image rootfs.tar
    rm -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    rm -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM
    rm -f /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_users_table.txt
    echo '#!/bin/sh' > /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    echo "set -e" >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    echo "chown -h -R 0:0 /home/zengjf/zengjfos/buildroot-2017.02.3/output/target" >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    printf '       sshd -1 sshd -1 * - - - SSH drop priv user
     ftp -1 ftp -1 * /home/ftp - - Anonymous FTP User

' >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_users_table.txt
    PATH="/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/sbin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/sbin:/home/bin:/home/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/zengjf/zengjfos/buildroot-2016.08/output/host/opt/ext-toolchain/bin::/home/zengjf/zengjfos/AplexOS/git-repo:/home/linux/pycharm-community-2017.1.3/bin" /home/zengjf/zengjfos/buildroot-2017.02.3/support/scripts/mkusers /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_users_table.txt /home/zengjf/zengjfos/buildroot-2017.02.3/output/target >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    cat system/device_table.txt > /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_device_table.txt
    printf '       /bin/busybox                     f 4755 0  0 - - - - -
 /dev/console c 622 0 0 5 1 - - -

' >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_device_table.txt
    echo "/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/makedevs -d /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_device_table.txt /home/zengjf/zengjfos/buildroot-2017.02.3/output/target" >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    # 这里很重要，因为这里可以将target中的内容打包进入rootfs.tar中去
    printf '       (cd /home/zengjf/zengjfos/buildroot-2017.02.3/output/target; find -print0 | LC_ALL=C sort -z | tar  -cf /home/zengjf/zengjfos/buildroot-2017.02.3/output/images/rootfs.tar --null --no-recursion -T - --numeric-owner)
' >> /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    # 给_fakeroot.fs加执行权限
    chmod a+x /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    # 用fakeroot执行_fakeroot.fs
    PATH="/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/sbin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/sbin:/home/bin:/home/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/zengjf/zengjfos/buildroot-2016.08/output/host/opt/ext-toolchain/bin::/home/zengjf/zengjfos/AplexOS/git-repo:/home/linux/pycharm-community-2017.1.3/bin" /home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin/fakeroot -- /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    rootdir=/home/zengjf/zengjfos/buildroot-2017.02.3/output/target
    table='/home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_device_table.txt'
    # 相当于拷贝，同时可以设定权限
    /usr/bin/install -m 0644 support/misc/target-dir-warning.txt /home/zengjf/zengjfos/buildroot-2017.02.3/output/target/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM
    # 使用bzip2进行压缩
    PATH="/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/sbin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/bin:/home/zengjf/zengjfos/buildroot-2017.02.3/output/host/usr/sbin:/home/bin:/home/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/zengjf/zengjfos/buildroot-2016.08/output/host/opt/ext-toolchain/bin::/home/zengjf/zengjfos/AplexOS/git-repo:/home/linux/pycharm-community-2017.1.3/bin" bzip2 -9 -c /home/zengjf/zengjfos/buildroot-2017.02.3/output/images/rootfs.tar > /home/zengjf/zengjfos/buildroot-2017.02.3/output/images/rootfs.tar.bz2

二、fakeroot使用：
    1. 参考命令：fakeroot -- /home/zengjf/zengjfos/buildroot-2017.02.3/output/build/_fakeroot.fs
    2. cd <your path> && fakeroot -- tar jcvf rootfs.tar.bz2 *