Script for build root file system

#!/bin/sh

ROOT_NAME=rootfs
ARCH=armv4t
CROSS_COMPILE=arm-none-linux-gnueabi
CC=$CROSS_COMPILE-gcc
STRIP=$CROSS_COMPILE-strip


echo "Build root filesystem start..."

createROOT()
{
    echo Create $ROOT_NAME...
    rm -rf $ROOT_NAME || return 1
    mkdir $ROOT_NAME || return 1
    cd $ROOT_NAME
    echo "Create all dir needed..."
    mkdir dev etc home lib mnt proc sys tmp || return 1

    return 0
}

copyLIBS()
{
    echo "Copy all runtime libraries from toolchain directory..."
    TMP_DIR=`$CC -march=$ARCH -print-sysroot`/lib
    cp $TMP_DIR/ld-linux.so.3                 lib || return 1
    cp $TMP_DIR/libc.so.6                     lib || return 1
    cp $TMP_DIR/libgcc_s.so.1                 lib || return 1
    cp $TMP_DIR/libpthread.so.0             lib || return 1
    cp $TMP_DIR/librt.so.1                    lib || return 1
    cp $TMP_DIR/libcrypt.so.1                 lib || return 1
    cp $TMP_DIR/libdl.so.2                 lib || return 1
    cp $TMP_DIR/libm.so.6                 lib || return 1
    cp $TMP_DIR/libresolv.so.2             lib || return 1
    cp $TMP_DIR/libutil.so.1                lib || return 1
    $STRIP lib/*


    return 0
}

buildETC()
{
    cd etc

    echo "Create inittab in etc directory..."
    echo "null::sysinit:/bin/mount -a" > inittab                    || return 1
    echo "null::sysinit:/bin/hostname -F /home/yqliu29" >> inittab    || return 1
    echo "::sysinit:/etc/init.d/rcS" >> inittab                        || return 1
    echo "::askfirst:-/bin/sh" >> inittab                            || return 1
    echo "::restart:/sbin/init" >> inittab                            || return 1
    echo "::ctrlaltdel:/sbin/reboot" >> inittab                        || return 1
    echo "::shutdown:/bin/umount -a -r" >> inittab                    || return 1
    echo "::shutdown:/sbin/swapoff -a" >> inittab                    || return 1
    chmod +x inittab

    echo "Create fstab in etc directory..."
    echo "devpts /dev/pts devpts defaults,gid=5,mod=620 0 0" > fstab    || return 1
    echo "proc /proc proc 0 0" >> fstab    || return 1
    echo "tmpfs /tmp tmpfs defaults 0 0" >> fstab    || return 1
    echo "sysfs /sys sysfs defaults 0 0" >> fstab    || return 1

    echo "Create mdev.conf in etc..."
    touch mdev.conf || return 1

    echo "Create profile in etc..."
    echo "PS1='[\u@\h \w]'" > profile                        || return 1
    echo "PATH=/bin:/sbin:/usr/bin:/usr/sbin" >> profile    || return 1
    echo "export PS1 PATH" >> profile                        || return 1
    echo "export LD_LIBRARY_PATH=/lib" >> profile            || return 1

    echo "Create rcS in etc/init.d..."
    mkdir init.d    || return 1
    cd init.d        || return 1

    echo "#! /bin/sh" > rcS                                                            || return 1
    echo "echo /sbin/mdev > /proc/sys/kernel/hotplug" >> rcS                        || return 1
    echo "mdev -s" >> rcS                                                            || return 1
    echo "/sbin/ifconfig lo 127.0.0.1 up" >> rcS                                    || return 1
    echo "/sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo" >> rcS                || return 1
    echo "/sbin/ifconfig eth0 192.168.2.56 netmask 255.255.255.0" >> rcS            || return 1
    echo "/sbin/route add default gw 192.168.2.1" >> rcS                            || return 1
    echo "echo \"*******************************************************\"" >> rcS    || return 1
    echo "echo \"* Linux-2.6.34.4 YAFFS BOOT *\"" >> rcS    || return 1
    echo "echo \"* [e-mail] *\"" >> rcS    || return 1
    echo "echo \"*******************************************************\"" >> rcS    || return 1
    chmod +x rcS

    cd ../..

    return 0
}

buildHOME()
{
    echo "Build files in /home..."
    cd home    || return 1
    mkdir yqliu29    || return 1
    cd yqliu29        || return 1
    echo "yqliu29" > yqliu29 || return 1

    cd ../..                || return 1
    return 0
}

BUSY_BOX_ADDRESS=
BUSY_BOX_VERSION=1.19.4

buildBUSYBOX()
{
    echo "Build Busybox..."

    cd .. || return 1

    if [ ! -f busybox-$BUSY_BOX_VERSION.tar.bz2 ]
    then
        wget $BUSY_BOX_ADDRESS/busybox-$BUSY_BOX_VERSION.tar.bz2        || return 1
    fi

    if [ ! -d busybox-$BUSY_BOX_VERSION ]
    then
        tar xvf busybox-$BUSY_BOX_VERSION.tar.bz2                        || return 1
    fi

    cd busybox-$BUSY_BOX_VERSION || return 1

    OLD_MAKE_INFO=`grep 'CROSS_COMPILE ?=' Makefile`

    if [ "$OLD_MAKE_INFO" == "CROSS_COMPILE ?=" ]
    then
        sed -i 's/CROSS_COMPILE ?=/CROSS_COMPILE ?= arm-none-linux-gnueabi-/' Makefile || return 1
    fi

    make defconfig    || return 1
    make            || return 1
    make install    || return 1

    cp _install/* ../$ROOT_NAME -r || return 1

    return 0
}

createROOT         || exit 1
copyLIBS        || exit 1
buildETC        || exit 1
buildHOME        || exit 1
buildBUSYBOX    || exit 1

echo Build $ROOT_NAME finished normally!