#!/bin/bash

# Copyright (C) 2017-2018 Daniel Tartavel-jeannot   <contact@librepc.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.


function title()
{
    echo -e "\e[1;32m${1}\e[0m"
}


function info()
{
    echo -e "\e[36m${1}\e[0m"
}


function warning()
{
    echo -e "\e[1;35m${1}\e[0m"
}


function error()
{
    echo -e "\e[1;31m${1}\e[0m"
}


function help()
{
    echo -e "${CMDNAME} [option] [size of image in Go]"
    echo -e "Options:"
    echo -e "--all                create ready to burn image of Mageia ${MAGEIA_VERSION}"
    echo -e "--clean              Clean all (suppress all) to make a new image"
    echo -e "--size               size of image default: 7Go"
    echo -e "--build-path         Path to the build directory of the image of Mageia ${MAGEIA_VERSION}"
    echo -e "--target             target system (for now rpi, odroid)"
    echo -e "--target-version     version of the target (0, 1, 2, 3 for rpi, 3 or 4 for odroid)"
    echo -e "--config             Path to config files"
    echo -e "--bootfs             filesystem of boot partition (ext4 or vfat) default: ext4"
    echo -e "--nonfree            activate nonfree repos"
    echo -e "--tainted            activate tainted repos"
    echo -e "\nBuild levels:"
    echo -e "--create-chroot      Create the chroot directory"
    echo -e "--addmedia           add mirrors"
    echo -e "--update-mirror      update urpmi database"
    echo -e "--install-basesystem install base system"
    echo -e "--chroot             chroot to arm directory and launch packages installation"
    echo -e "--create-image       Create the image of Mageia ${MAGEIA_VERSION}"
    
    echo -e "\nFor image size, make sure it fit on physical support. (Default size is 7 Go)"
}


# cleaning build space
function clean()
{
    # Unmounting /dev /proc /sys in chroot
    title "Cleaning"
    if ! [ -z "$(mountpoint -qd "${BUILD_PATH}/dev")" ]; then # mountpoint - see if a directory or file is a mountpoint ; -d Show the major/minor numbers of the device that is mounted on the given directory.
        info "Unmounting ${BUILD_PATH}/dev"
        umount "${BUILD_PATH}/dev"
        if ! [ ${?} -ne 0 ]; then
            error "line ${LINENO} can't unmount ${BUILD_PATH}/dev : exiting"
            #exit ${ERR_1}
        fi
    fi
    if ! [ -z "$(mountpoint -qd "${BUILD_PATH}/sys")" ]; then
        info "Unmounting ${BUILD_PATH}/sys"
        umount "${BUILD_PATH}/sys"
        if ! [ ${?} -ne 0 ]; then
            error "line ${LINENO} can't unmount ${BUILD_PATH}/sys : exiting"
            #exit ${ERR_1}
        fi
    fi
    if ! [ -z "$(mountpoint -qd "${BUILD_PATH}/proc")" ]; then
        info "Unmounting ${BUILD_PATH}/proc"
        umount "${BUILD_PATH}/proc"
        if ! [ ${?} -ne 0 ]; then
            error "line ${LINENO} can't unmount ${BUILD_PATH}/proc : exiting"
            #exit ${ERR_1}
        fi
    fi
    # Removing old Build directory
    if [ -d "${BUILD_PATH}" ]; then
        info "Removing ${BUILD_PATH}"
        /bin/rm -Rf "${BUILD_PATH}"
    else
        warning "${BUILD_PATH} does not exists"
    fi
    # removing old image
    if [ -e "${IMAGE}" ]; then
        info "Removing ${IMAGE}"
        /bin/rm -f "${INSTALL_PATH}/${IMAGE}"
    else
        warning "${IMAGE} does not exists"
    fi
    # removing loop devices
    for LOOP in $(ls /dev/loop*[0-9]p1); do
        X=${LOOP:0:10}
        if [ -e "${X}" ]; then
            info "removing ${X}"
            partx -d "${X}" # Tell the kernel about the presence and numbering of partitions.
        fi
    done
    # Removing boot and root directory
    if [ -d "${BOOT}" ]; then
        info "Removing ${BOOT}"
        /bin/rmdir "${BOOT}"
    else
        warning "${BOOT} does not exists"
    fi
    if [ -d "${ROOT}" ]; then
        info "Removing ${ROOT}"
        /bin/rmdir "${ROOT}"
    else
        warning "${ROOT} does not exists"
    fi
    return 0
}


# creation of install path and copy of qemu ( installing it if not yet installed )
function createchroot()
{
    title "Making chroot"
    if ! [ -f /bin/qemu-arm-static ]; then
        title "Qemu package not present : installing qemu packages"
        /sbin/urpmi --auto --no-recommends qemu-user-static
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} can't install qemu-user-static : exiting"
            exit ${ERR_1}
        fi
    fi
    # Starting qemu service if not started
    /bin/systemctl is-active systemd-binfmt.service
    if  [ ${?} -ne 0 ]; then
        title "Starting systemd-binfmt.service"
        /bin/systemctl start systemd-binfmt.service
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} can't start qemu-user-static : exiting"
            exit ${ERR_1}
        fi
    fi
    return 0
}


# adding Mageia repositories
function addmedia()
{
    title "Creating media ${MIRROR}"
    /sbin/urpmi.addmedia --urpmi-root  "${BUILD_PATH}" --distrib "${MIRROR}"
    err=${?}
    if [ ${err} -ne 0 ]; then
        error "line ${LINENO} error ${err} - can't add medias from ${MIRROR} : exiting"
        exit ${ERR_1}
    fi
    if [ ${NONFREE} -eq 1 ]; then
        title "activating non-free repos"
        /sbin/urpmi.update --urpmi-root  "${BUILD_PATH}" --no-ignore Nonfree\ Release Nonfree\ Updates
        err=${?}
        if [ ${err} -ne 0 ]; then
            error "line ${LINENO} error ${err} - can't activate medias nonfree : exiting"
            exit ${ERR_1}
        fi
    fi
    if [ ${TAINTED} -eq 1 ]; then
        title "activating tainted repos"
        /sbin/urpmi.update --urpmi-root  "${BUILD_PATH}" --no-ignore Tainted\ Release Tainted\ Updates
        err=${?}
        if [ ${err} -ne 0 ]; then
            error "line ${LINENO} error ${err} - can't activate medias tainted : exiting"
            exit ${ERR_1}
        fi
    fi
    return 0
}


function updatemirror()
{
    title "updating mirror"
    /sbin/urpmi.update -a --urpmi-root "${BUILD_PATH}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} can't update mirrors : exiting"
        exit ${ERR_1}
    fi
    return 0
}


function installbasesystem()
{
    # Create Build path
    if ! [ -d "${BUILD_PATH}" ]; then
        warning "Build path ( ${BUILD_PATH} ) does not exist, do you want to create it ? [Y|n] "
        read yn
        if [ -z ${yn} ] || [ ${yn} = "Y" ] || [ ${yn} = "y" ]; then
            title "Creating ${BUILD_PATH}"
            /bin/mkdir -p "${BUILD_PATH}/usr/bin" "${BUILD_PATH}/usr/lib/binfmt.d"
            if [ ${?} -ne 0 ]; then
                error "line ${LINENO} can't create ${BUILD_PATH} : exiting"
                exit ${ERR_1}
            fi
        else
            exit ${ERR_1}
        fi
    else
        info "Build path exists"
    fi

    title "installing basesystem"
    /sbin/urpmi --urpmi-root "${BUILD_PATH}"  --ignorearch --no-verify-rpm --auto --split-level 200 --split-length 200 shadow-utils basesystem-minimal
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error installing shadow-utils or basesystem-minimal : exiting"
        exit ${ERR_1}
    fi
    #/sbin/urpmi --urpmi-root "${BUILD_PATH}"  --ignorearch --no-verify-rpm --auto --split-level 200 --split-length 200 basesystem-minimal
    #if [ ${?} -ne 0 ]; then
    #    error "line ${LINENO} error installing basesystem-minimal  : exiting"
    #    exit ${ERR_1}
    #fi
    /sbin/urpmi --urpmi-root "${BUILD_PATH}"  --ignorearch --no-verify-rpm --auto --split-level 200 --split-length 200 urpmi locales-fr systemd u-boot
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error installing urpmi or locales.fr : exiting"
        exit ${ERR_1}
    fi
    return 0
}


function preparechroot()
{
    title "Preparing chrooting in ${BUILD_PATH}"

    #Copying qemu

    /bin/cp /bin/qemu-arm-static "${BUILD_PATH}/usr/bin/"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} can't copy /bin/qemu-user-static to ${BUILD_PATH}/usr/bin/ : exiting"
        exit ${ERR_1}
    fi
    /bin/cp /usr/lib/binfmt.d/qemu-arm-static.conf "${BUILD_PATH}/usr/lib/binfmt.d"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} can't copy /usr/lib/binfmt.d/qemu-arm-static.conf to ${BUILD_PATH}/usr/lib/binfmt.d : exiting"
        exit ${ERR_1}
    fi


    info "making /etc/hostname"
    echo "${HOSTNAME}" > "${BUILD_PATH}/etc/hostname"

    info "copying second stage script in ${BUILD_PATH}"
    #echo "/bin/cp ${CONFIG_PATH}/second_stage_install.sh ${BUILD_PATH}/"
    cp --preserve=mode "${CONFIG_PATH}/second_stage_install.sh" "${BUILD_PATH}/second_stage_install.sh"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error copying ${CONFIG_PATH}/second_stage_install.sh : exiting"
        exit ${ERR_1}
    fi

    info "creation of user account"
    echo -e "/bin/passwd << EOF\n${ROOT_PWD}\n${ROOT_PWD}\nEOF\n    /sbin/useradd ${ID_USER}\n    /bin/passwd ${ID_USER} << EOF\n${PASSWORD}\n${PASSWORD}\nEOF" >>"${BUILD_PATH}/second_stage_install.sh"

    info "Copying skel in root directory"
    /bin/rsync -rlptH /etc/skel/ "${BUILD_PATH}/root/"

    postPrepareChroot
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error in postPrepareChroot function."
        exit ${ERR_1}
    fi
    return 0
}


function jumpchroot()
{
    title "chrooting to ${BUILD_PATH}"
    info "mounting dev, sys, proc directories in chroot"
    /bin/mount -B /dev "${BUILD_PATH}/dev"
    if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error mounting ${BUILD_PATH}/dev : exiting"
            exit ${ERR_1}
    fi
    /bin/mount -B /sys "${BUILD_PATH}/sys"
    if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error mounting ${BUILD_PATH}/sys : exiting"
            exit ${ERR_1}
    fi
    /bin/mount -B /proc "${BUILD_PATH}/proc"
    if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error mounting ${BUILD_PATH}/proc : exiting"
            exit ${ERR_1}
    fi
    info "Copying resolv.conf"
    /bin/cp -v --preserve=mode /etc/resolv.conf "${BUILD_PATH}/etc/"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error copying ${BUILD_PATH}/etc/resolv.conf : exiting"
        exit ${ERR_1}
    fi
    if [ "$OPT" = "chroot" ]; then
        /sbin/chroot "${BUILD_PATH}"
    else
        /sbin/chroot --userspec root:root "${BUILD_PATH}" /bin/bash -v -c 'sh /second_stage_install.sh'
    fi
    RET=${?}
    if [ ${RET} -ne 0 ]; then
        error "line ${LINENO} Warning : chrooting to ${BUILD_PATH} retrurn an error ${RET}"
        ERRORN=$((${ERRORN}+1))
    fi
    info "unmounting dev, sys, proc"
    /bin/umount -lf "${BUILD_PATH}/dev"
    if [ ${?} -ne 0 ]; then
        warning "line ${LINENO} Warning : error unmounting ${BUILD_PATH}/dev, continuing anyway"
        ERRORN=$((${ERRORN}+1))
    fi
    /bin/umount -lf "${BUILD_PATH}/sys"
    if [ ${?} -ne 0 ]; then
        warning "line ${LINENO} Warning : error unmounting ${BUILD_PATH}/sys, continuing anyway"
        ERRORN=$((${ERRORN}+1))
    fi
    /bin/umount -lf "${BUILD_PATH}/proc"
    if [ ${?} -ne 0 ]; then
        warning "line ${LINENO} Warning : error unmounting ${BUILD_PATH}/proc, continuing anyway"
        ERRORN=$((${ERRORN}+1))
    fi
    return 0
}


function verify_disk_space()
{
    title "Verifying if there is enough space on disk to make the image"
    DISK_SPACE=$(/usr/bin/df -BG --output=avail "${INSTALL_PATH}"  | sed '1d;s/[^0-9]//g')
    info "Free disk space: ${DISK_SPACE}G"
    if [ ${DISK_SPACE} -lt ${IMAGE_SIZE} ]; then
        warning "image size is greater than disk space"
        info "correct the problem and relaunch the script with parameter --create-rpi-image"
        info "${0} --size ${IMAGE_SIZE} --create-rpi-image"
        return 1
    fi
    return 0
}


function createImageWrap()
{
    title "Wrap image creation"
    preImgCreation
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error in the process ${CONFIG_PATH}/createImage.sh ."
        exit ${ERR_1}
    fi
    createimage
    if [ -z "${BOOTFS}" ]; then
        BOOTFS="ext4"
    fi
    formatpartitions ${BOOTFS} ext4
    copyingsystem
    return 0
}


createimage()
{
    title " in ${IMAGE}"
    if [ -f "${INSTALL_PATH}/${IMAGE}" ]; then
        warning "Deleting previous image"
        /bin/rm -f "${INSTALL_PATH}/${IMAGE}"
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error can't remove previous image at ${INSTALL_PATH}/${IMAGE} : exiting"
            exit ${ERR_1}
        fi
    fi

    warning "please wait until end of image creation"
    /bin/dd if=/dev/zero of="${INSTALL_PATH}/${IMAGE}" bs=1MB count=$(( ${IMAGE_SIZE} * 1024 ))
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} can't make image at ${INSTALL_PATH}/${IMAGE} : exiting"
        exit ${ERR_1}
    fi
    DEVICE=$(/sbin/losetup -f --show "${INSTALL_PATH}/${IMAGE}")
    
    ### TODO : Functionnalize
    
    if [ ${TARGET} = "odroid" ]; then
        info "installing blobs"
        pushd "${CONFIG_PATH}/sd_fuse"
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error directory ${CONFIG_PATH}/sd_fuse does not exists : exiting"
            exit ${ERR_1}
        else
            ./sd_fusing.sh "${DEVICE}"
        fi
        pushd
    fi
    
    ###

    info "making partitions"
    echo -e "${FDISK_SCRIPT}" | /sbin/fdisk ${DEVICE}

    # Activate loop device
    /sbin/losetup -d "${DEVICE}"
    DEVICE=$(/sbin/partx -va "${INSTALL_PATH}/${IMAGE}" | /bin/grep -m 1 -E -o '/dev/loop.?')
    info "device ${DEVICE}"
    info "partitions list:"
    info "$(/sbin/partx -v "${INSTALL_PATH}/${IMAGE}")"
    BOOTP="${DEVICE}p1"
    ROOTP="${DEVICE}p2"
    return 0
}


formatpartitions()
{
    info "Formatting partitions"
    info "Boot : ${BOOTP} as ${1}"
    "/sbin/mkfs.${1}" "${BOOTP}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error formating ${BOOTP} : exiting"
        /sbin/losetup -d "${DEVICE}"
        exit ${ERR_1}
    fi
    info "Root : ${ROOTP} as ${2}"
    "/sbin/mkfs.${2}" "${ROOTP}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error formating ${ROOTP} : exiting"
        /sbin/losetup -d "${DEVICE}"
        exit ${ERR_1}
    fi
    BOOT_UUID=$(blkid -s UUID -o value UUID "${BOOTP}")
    info "Boot UUID: ${BOOT_UUID}"
    ROOT_UUID=$(blkid -s UUID -o value UUID "${ROOTP}")
    info "Root UUID: ${ROOT_UUID}"
    return 0
}


copyingsystem()
{
    info "mounting partitions, making mountpoint if necessary"
    if ! [ -d "${BOOT}" ]; then
        /bin/mkdir "${BOOT}"
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error making directory ${BOOT} : exiting"
            exit ${ERR_1}
        fi
    fi
    if ! [ -d "${ROOT}" ]; then
        /bin/mkdir "${ROOT}"
        if [ ${?} -ne 0 ]; then
            error "line ${LINENO} error making directory ${ROOT} : exiting"
            exit ${ERR_1}
        fi
    fi
    /bin/mount "${BOOTP}" "${BOOT}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error mounting ${BOOTP} : exiting"
        exit ${ERR_1}
    fi
    /bin/mount "${ROOTP}" "${ROOT}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} error mounting ${ROOTP} : exiting"
        exit ${ERR_1}
    fi

    info "making /etc/fstab"
    ### BUG : /mnt/arm_boot is set to vfat for all plateforms, odroid configuration says ext4.
    echo -e "proc            /proc           proc    defaults        0       0\nUUID=${BOOT_UUID}  /mnt/arm_boot   vfat    defaults        0       0\nUUID=${ROOT_UUID}  /               ext4    defaults        0       0" > "${BUILD_PATH}/etc/fstab"

    if [ ! -d "${BUILD_PATH}/boot/extlinux" ]; then
        info "making /boot/extlinux/extlinux.conf"
        mkdir -p "${BUILD_PATH}/boot/extlinux"
    fi
    if [ ! -f "${BUILD_PATH}/boot/extlinux/extlinux.conf" ]; then
        sed -e s/\<UUID\>/${ROOT_UUID}/g ${CONFIG_PATH}/extlinux.conf >"${BUILD_PATH}/boot/extlinux/extlinux.conf"
        KERNEL_ID=$(basename ${BUILD_PATH}/usr/lib/linux-*)
        sed -i -e s/\<FDTDIR\>/${KERNEL_ID}/g "${BUILD_PATH}/boot/extlinux/extlinux.conf"
    fi
    
    ### TODO : Functionnalize
    
    case ${TARGET} in
        "rpi")
            info "copying 10-vchiq-permissions.rules"
            cp --preserve=mode "${CONFIG_PATH}/10-vchiq-permissions.rules" "${BUILD_PATH}/etc/udev/rules.d/"
            info "Making /etc/modules"
            echo -e "vchiq\nsnd_bcm2835\nvc4\nbrcmfmac" >> "${BUILD_PATH}"/etc/modules

            ARM_BOOT="${BUILD_PATH}/mnt/arm_boot"
            if ! [ -d "${ARM_BOOT}" ]; then
                mkdir -p "${ARM_BOOT}"
            fi
            info "copying modprobe.conf"
            /usr/bin/cp -v --preserve=mode "${CONFIG_PATH}/modprobe.conf" "${BUILD_PATH}/etc/"
            chown root:root "${BUILD_PATH}/etc/modprobe.conf"

            info "copying firmware, overlays in rpi boot partition"
#            cp -v --preserve=mode "${BUILD_PATH}/usr/lib/linux-"* "${BOOT}/dtb"
            cp -v --preserve=mode "${FIRMWARE_PATH}/${FIRMWARE_DIR}/boot/start"* "${ARM_BOOT}/"
            cp -v --preserve=mode "${FIRMWARE_PATH}/${FIRMWARE_DIR}/boot/fixup"* "${ARM_BOOT}/"
            cp -v --preserve=mode "${FIRMWARE_PATH}/${FIRMWARE_DIR}/boot/bootcode.bin"* "${ARM_BOOT}/"
            cp -vR --preserve=mode "${FIRMWARE_PATH}/${FIRMWARE_DIR}/boot/overlays" "${ARM_BOOT}/"

            info "copying u-boot binary to ${ARM_BOOT}"
            case ${TARGET_VERSION} in
                "0")
                    info "copying u-boot for ${TARGET} 0"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/rpi_0_w/u-boot.bin" "${ARM_BOOT}/kernel.img"
                    ;;
                "1")
                    info "copying u-boot for ${TARGET} 1"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/rpi/u-boot.bin" "${ARM_BOOT}/kernel.img"
                    ;;
                "2")
                    info "copying u-boot for ${TARGET} 2"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/rpi_2/u-boot.bin" "${ARM_BOOT}/kernel.img"
                    ;;
                "3_32")
                    info "copying u-boot for ${TARGET} 3 32 bits"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/rpi_3_32b/u-boot.bin" "${ARM_BOOT}/kernel.img"
                    ;;
                "3+")
                    info "copying u-boot for ${TARGET} 3b+ 32 bits"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/rpi_3_32b/u-boot.bin" "${ARM_BOOT}/kernel.img"
                    ;;
            esac

#            info "copying raspberry optionals files in opt"
#            /bin/rsync -rlptDH "${FIRMWARE_PATH}/${FIRMWARE_DIR}/opt/" "${BUILD_PATH}/opt/"

            info "copying wifi firmware file missing in kernel-firmware-nonfree"
            if ! [ -d "${ROOT}/usr/lib/firmware/brcm/" ]; then
                /bin/mkdir -p "${ROOT}/usr/lib/firmware/brcm/"
            fi
            if ! [ -f "${ROOT}/usr/lib/firmware/brcm/brcmfmac434"* ]; then
                /bin/cp --preserve=mode "${CONFIG_PATH}/brcmfmac434"* "${ROOT}/usr/lib/firmware/brcm/"
                if [ ${?} -ne 0 ]; then
                    error "line ${LINENO} error copying wifi firmware in ${ROOTP}/usr/lib/firmware/brcm/ : exiting"
                    exit ${ERR_1}
                fi
            fi

            info "copying Mageia image to root partition"
            /bin/rsync -rlptogDH --exclude "${ARM_BOOT}/" --exclude "qemu-arm-static*" "${BUILD_PATH}/" "${ROOT}/"
            /bin/rsync -rlptogDH "${ARM_BOOT}/" "${BOOT}/"
            ;;
            
        "odroid")
            ODROID_BOOT="${BUILD_PATH}/mnt/odroid_boot"
            if ! [ -d "${ODROID_BOOT}" ]; then
                mkdir -p "${ODROID_BOOT}"
            fi
            case ${TARGET_VERSION} in
                "xu4")
                    info "copying u-boot for ${TARGET} ${TARGET_VERSION}"
                    cp --preserve=mode "${BUILD_PATH}/usr/lib/u-boot/${TARGET}-${TARGET_VERSION}/u-boot.bin" "${ARM_BOOT}/"
                    ;;
            esac
            # temporary code waiting inclusion of xu4 in Mageia kernel and u-boot

            info "Copying extlinux.conf on ${ODROID_BOOT}"
            cp --preserve=mode -R "${BUILD_PATH}/boot/extlinux" "${ODROID_BOOT}/"
            info "copying Mageia image to root partition"
            /bin/rsync -rlptogDH --exclude "${ODROID_BOOT}/" --exclude "qemu-arm-static*" "${BUILD_PATH}/" "${ROOT}/"
            /bin/rsync -rlptogDH "${ODROID_BOOT}/" "${BOOT}/"
            ;;
            
        "bananaPro")
            #TODO
            ;;
    esac
    
    ### END TODO

#    info "copying tools in /usr/local/bin/"
#    /bin/cp -v --preserve=mode "${SOURCE_PATH}/tools/" "${BUILD_PATH}/usr/local/bin/"
#    if ! [ ${?} -eq 0 ]; then
#        error "line ${LINENO} error copying tools"
#        ERRORN=$((${ERRORN}+1))
#    fi
#    /bin/mkdir "${ROOT}/boot"

    copyingcommon
    # Syncing devices before unmounting
    /usr/bin/sync
    /usr/bin/umount "${BOOT}" "${ROOT}"
    if [ ${?} -eq 0 ]; then
        /bin/rmdir "${BOOT}" "${ROOT}"
    else
        error "line ${LINENO} error unmounting ${ROOT} or ${BOOT} : exiting"
        exit ${ERR_1}
    fi

    /usr/sbin/partx -d "${DEVICE}"
    if [ ${?} -ne 0 ]; then
        error "line ${LINENO} warning : error unmounting ${DEVICE} "
        exit ${ERR_1}
    fi
    warning "You can now burn the image ( ${INSTALL_PATH}/${IMAGE} ) on SD card"
    return 0
}


# Copying files common to all systems
copyingcommon()
{
    title "Copying common files and configuration"
    rsync -rlptDH "${SOURCE_PATH}/common/" "${ROOT}/"
    rsync -rlptDH "${SOURCE_PATH}/tools/"*.sh "${ROOT}/usr/local/bin/"
    chown root:root "${ROOT}/usr/local/bin/"
    return 0
}


function preImgCreation()
{
    error "This function is called if no sourced file about fdisk was lauched."
    return 1
}

function postPrepareChroot()
{
    error "This function is called if no sourced file contain postPrepareChroot function."
    return 1
}

ERRORN=0
ERR_1=1
ERR_DEFAULT_CONFIG=2
ERR_NO_CONFIG_FILE=3
ERR_4=4
ERR_5=5
ERR_NO_SPACE=6
ERR_7=7
ERR_8=8
ERR_9=9


#######################
# PROGRAMM START HERE #
#######################


info ${0}

SOURCE_PATH="$(/bin/dirname  "$(readlink -f "${0}")")"
INSTALL_PATH="${SOURCE_PATH}/arm"
FILES_PATH="${SOURCE_PATH}/files"
PLATFORMS_PATH="${SOURCE_PATH}/platforms"

CMDNAME=$(/bin/basename "${0}")

#while read -r;do
#    for MAGEIA_VERSION in $REPLY
#    do
#        if [ $MAGEIA_VERSION <= 5 ]; then
#            echo 'Mageia version >= 6 is needed'
#            exit
#        fi
#        break
#    done
#done < /etc/version


if [ ${#} == 0 ]; then
    help
    exit
fi


# parsing commandline
TEMP=$(getopt -o h,a --long all,help,clean,create-chroot,addmedia,create-image,,config:,target:,target-version:,chroot,bootfs:,install-basesystem,update-mirror,build-path:,size:,nonfree,tainted -n ${CMDNAME}  -- "${@}")
if [ ${?} -ne 0 ] ; then error "line ${LINENO} Failed parsing options." >&2 ; exit ${ERR_1} ; fi
eval set -- "${TEMP}"

echo "${TEMP}"
# Note the quotes around `$TEMP': they are essential! Or not, $( ) do the same as ` `. But there are the ` ' used ?
while true; do
    case "${1}" in
    -h|--help)
        help
        exit 0
        ;;
    -a|--all)
        OPT="all"
        shift 1
        ;;
    --clean)
        OPT="clean"
        shift
        ;;
    --size)
        IMAGE_SIZE_P=${2}
        shift 2
        ;;
    --build-path)
        INSTALL_PATH_P="${2}"
        shift 2
        ;;
    --chroot)
        if [ -z ${OPT} ]; then
            OPT="chroot"
        fi
        shift
        ;;
    --create-chroot)
        if [ -z ${OPT} ]; then
            OPT="createchroot"
        fi
        shift
        ;;
    --addmedia)
        if [ -z ${OPT} ]; then
            OPT="addmedia"
        fi
        shift
        ;;
    --update-mirror)
        if [ -z ${OPT} ]; then
            OPT="updatemirror"
        fi
        shift
        ;;
    --install-basesystem)
        if [ -z ${OPT} ]; then
            OPT="installbasesystem"
        fi
        shift
        ;;
    --create-image)
        if [ -z ${OPT} ]; then
            CREATEIMAGE=true
            OPT="createimage"
        fi
        shift
        ;;
    --target)
        TARGET_P=${2}
        shift 2
        ;;
    --target-version)
        TARGET_VERSION_P=${2}
        shift 2
        ;;
    --config)
        CONFIG_PATH="${PLATFORMS_PATH}/${2}"
        shift 2
        ;;
    --bootfs)
        BOOTFS_P=${2}
        shift 2
        ;;
    --nonfree)
        NONFREE_P=1
        ;;
    --tainted)
        TAINTED_P=1
        ;;
    --)
      shift
      break;;
    *)
        error "Parameter ${1} does not exists "
        exit ${ERR_1};;
    esac
done


# path of config file
if ! [ -d "${CONFIG_PATH}" ]; then
    info " Config path does not exists, defaulting to ./platforms/${TARGET}"
    CONFIG_PATH="${PLATFORMS_PATH}/${TARGET}"
    warning "Do you want to create it and to copy the template file in? [Y|n] "
    read yn
    if [ -z ${yn} ] || [ ${yn} = "Y" ] || [ ${yn} = "y" ]; then
        /usr/bin/mkdir "${CONFIG_PATH}/"
        /usr/bin/cp --preserve=mode "${SOURCE_PATH}/mageia4arm.cfg.template" "${CONFIG_PATH}/mageia4arm.cfg"
        warning "You need now to modify the config file (${CONFIG_PATH}/mageia4arm.cfg) and relaunch the script"
        exit ${ERR_DEFAULT_CONFIG}
    else
        error( "Error: Can't continue without config file, exiting" )
        exit ${ERR_NO_CONFIG_FILE}            
    fi
fi

if [ -e "${CONFIG_PATH}/mageia4arm.cfg" ]; then
    info "using ${CONFIG_PATH}/mageia4arm.cfg as config"
    source "${CONFIG_PATH}/mageia4arm.cfg"                  #NOTE1 : Here is sourced a file with variables.
else
    warning "Config file does not exists, do you want i copy template ? [Y|n] "
    read yn
    if [ -z ${yn} ] || [ ${yn} = "Y" ] || [ ${yn} = "y" ]; then
        /usr/bin/cp --preserve=mode "${SOURCE_PATH}/mageia4arm.cfg.template" "${CONFIG_PATH}/mageia4arm.cfg"
        warning "You need now to modify the config file (${CONFIG_PATH}/mageia4arm.cfg) and relaunch the script"
        exit ${ERR_DEFAULT_CONFIG}
    fi
fi
# else # What are this "else fi" related to ?
#     
# fi

if ! [ -z "${IMAGE_SIZE_P}" ]; then
    IMAGE_SIZE=${IMAGE_SIZE_P}
fi
if ! [ -z "${INSTALL_PATH_P}" ]; then
    INSTALL_PATH=${INSTALL_PATH_P}
fi
if ! [ -z "${TARGET_P}" ]; then
    TARGET=${TARGET_P}
fi
if ! [ -z "${TARGET_VERSION_P}" ]; then
    TARGET_VERSION=${TARGET_VERSION_P}
fi
if ! [ -z "${BOOTFS_P}" ]; then
    BOOTFS=${BOOTFS_P}
fi
if ! [ -z "${NONFREE_P}" ]; then
    NONFREE=${NONFREE_P}
fi
if ! [ -z "${TAINTED_P}" ]; then
    TAINTED=${TAINTED_P}
fi

info "Option: "${OPT}

IMAGE="Mageia-${MAGEIA_VERSION}-${TARGET}${TARGET_VERSION}.img"
BOOT="/mnt/boot"
ROOT="/mnt/root"
BUILD_PATH="${INSTALL_PATH}/build"
ARM_VERSION="armv7hl"

# assign function for building image of TARGET ( rpi, odroid )
# case ${TARGET} in #NOTE2 : Why isn't it inside the sourced file ? Inside the .cfg ? It will make the code more flexible.
#     "bananaPro")
#         CREATEIMG="createbproimage"
#         ;;
#         
#     "odroid")
#         CREATEIMG="createxu3image"
#         ;;
#         
#     "rpi")
#         CREATEIMG="createrpiimage"
#         ;;
#         
#     *)
#         error "No Target : ${TARGET}"
#         exit ${ERR_1}
#         ;;
# esac

# Assigne a script for creating a particular target image (rpi, odroid, ...)
if [ -e "${CONFIG_PATH}/specialFunctions.sh" ]; then
    source "${CONFIG_PATH}/specialFunctions.sh"
fi

info "target : ${TARGET}"
info "target_version : ${TARGET_VERSION}"
info "source path: ${SOURCE_PATH}"
info "Install path: ${INSTALL_PATH}"
info "Build path: ${BUILD_PATH}"
info "Commande : ${CMDNAME}"
info "Firmware path : ${FIRMWARE_PATH}"
info "Firmware dir : ${FIRMWARE_DIR}"

# Defining default image size to 7 go
if [[ "${IMAGE_SIZE}" -lt 7 ]] || [[ "${IMAGE_SIZE}" -gt 128 ]]; then
    IMAGE_SIZE=7
fi

# change dir to install path and create it if not existing
if [ "${OPT}" != "clean" ]; then
    info "cd ${INSTALL_PATH}"
    if ! [ -e "${INSTALL_PATH}" ]; then
        /bin/mkdir -p "${INSTALL_PATH}"
        if [ -z ${?} ]; then
            error "line ${LINENO} can't make directory ${INSTALL_PATH} , exiting"
            exit ${ERR_1}
        fi
    fi
    cd "${INSTALL_PATH}"
    if [ -z ${?} ]; then
        error "line ${LINENO} can't change to directory ${INSTALL_PATH} , exiting"
        exit ${ERR_1}
    fi
fi

#if no parameters then display help message
if  [ -z ${OPT} ]; then
    OPT="--help"
fi

info "Image size is: ${IMAGE_SIZE} Go"

case ${OPT} in
    "clean")
        clean
        ;;
    "all")
        verify_disk_space
        if [ ${?} -eq 1 ]; then
            echo -e "Not enough space on disk\nDo you want to continue anyway ? [Y,n]"
            read yn
            if [ ${yn} = "n" ]; then
                exit ${ERR_NO_SPACE}
            fi
        fi
        createchroot
        addmedia
        updatemirror
        installbasesystem
        preparechroot
        jumpchroot
#       ${CREATEIMG}
        createImageWrap
        ;;
    "createchroot")
        createchroot
        ;;
    "chroot")
        jumpchroot
        ;;
    "addmedia")
        addmedia
        ;;
    "updatemirror")
        updatemirror
        ;;
    "createimage")
        verify_disk_space
        if [ ${?} -eq 1 ]; then
            warning "Not enough space on disk"
            exit ${ERR_NO_SPACE}
        fi
#       ${CREATEIMG}
        createImageWrap
        ;;
    "installbasesystem")
        installbasesystem
        ;;
esac


if ! [ -z ${ERRORN} ]; then
    warning "Some errors occurs : ${ERRORN} errors"
fi

exit ${ERRORN}