ev3dev-rootfs/sdcard-img-create at master · fdetro/ev3dev-rootfs · GitHub

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#!/bin/sh
# ------------------------------------------------------------------------------
# sdcard-img-create - Create the SD Card image using a file instead of the
#                     physical card - faster and easier to distribute!
#
# ------------------------------------------------------------------------------

die() { echo -n >&2 "\n$0: $@\n"; exit 1; }

# ------------------------------------------------------------------------------
# Make sure we're running as root, and that we have found the right sdcard!

[ "$(whoami)" != "root" ] && die "Sorry, you are not root!"

# ------------------------------------------------------------------------------
# Make sure we want to overwrite the file if it already exists!

echo    "-------------------------------------------------------------------------------"
echo    "WARNING - If you type \"Yes\" to the prompt, this script"
echo    "          will OVERWRITE the ev3dev.img file!"
echo    "-------------------------------------------------------------------------------"

echo -n "   Type \"Yes\" to continue ... "
read YesNo

[ ! "${YesNo}" = "Yes" ] && die " .. aborting, you typed \"${YesNo}\""

# ------------------------------------------------------------------------------
# If we find a pre-existing file, then ask if we want to recreate a blank one

if [ -e ev3dev.img ]; then
    echo    "-------------------------------------------------------------------------------"
    echo -n "   Found an existing ev3dev.img, type \"Yes\" to create a new blank image ... "
    read YesNo
fi

if [ ! -e ev3dev.img ] || [ -e ev3dev.img ] && [ "${YesNo}" = "Yes" ]; then
    echo    "-------------------------------------------------------------------------------"
    echo -n "   Creating a blank ev3dev.img file - should only take a few seconds ... "
    if ! type "fallocate" > /dev/null; then
        dd bs=512 if=/dev/zero of=ev3dev.img count=1M > /dev/null 2>&1
    else
        fallocate -l $((512*1024*1024)) ev3dev.img
    fi
    echo    "done."
fi


# ------------------------------------------------------------------------------
# Repartition ev3dev.img

echo    "-------------------------------------------------------------------------------"
echo -n "   Type \"Yes\" to repartition ev3dev.img ... "
read YesNo

if [ "${YesNo}" = "Yes" ]; then

    sector_size=$((512))
    sectors=$((1024 * 1024))

    part1_start=$((2048))
    part1_end=$((((48 * 1024 * 1024) / ${sector_size}) - 1 ))
    part2_start=$((((48 * 1024 * 1024) / ${sector_size})     ))
    part2_end=$((${sectors}-1 ))

    echo    "-------------------------------------------------------------------------------"
    echo
    echo    "ev3dev.img partition characteristics"
    echo
    echo    "Sector size       -> ${sector_size}"
    echo    "Sectors           -> ${sectors}"
    echo
    echo    "Partition 1 start -> ${part1_start}"
    echo    "Partition 1 end   -> ${part1_end}"
    echo    "Partition 2 start -> ${part2_start}"
    echo    "Partition 2 end   -> ${part2_end}"
    echo
    echo    "-------------------------------------------------------------------------------"
    echo -n "   Creating new disk label for ev3dev.img ... "

    parted -s --align minimal ev3dev.img  mklabel msdos                                       \
                                          mkpart  primary fat32 ${part1_start}s ${part1_end}s \
                                          mkpart  primary ext3  ${part2_start}s ${part2_end}s
    echo    "done."
fi

echo    "-------------------------------------------------------------------------------"
echo

# ------------------------------------------------------------------------------
# Display the ev3dev.img partitions

parted ev3dev.img print

# ------------------------------------------------------------------------------
# Now build up the file systems - first we mount the image using kpartx. The
# option for -p is there so we can identify the device later on like this:
#
# /dev/mapper/loop?-ev3dev-1   This will be the fat32 partition
# /dev/mapper/loop?-ev3dev-2   This will be the ext3  partition
#

echo    "-------------------------------------------------------------------------------"
echo    "   Mapping partitions from ev3dev.img ... "
echo

kpartx -vlsa -p"-ev3dev-" ./ev3dev.img

echo    "-------------------------------------------------------------------------------"
echo -n "   Type \"Yes\" to create a fresh fat32 file system on Partition 1 ... "
read YesNo

if [ "${YesNo}" = "Yes" ]; then

    echo -n "   Checking for ev3dev-fat32 mountpoint, will create if needed ... "
    [ -e ev3dev-fat32 ] && [ ! -d ev3dev-fat32 ] && die "ev3dev-fat32 exists, but it's a file!"
    [ ! -e ev3dev-fat32 ] && mkdir ev3dev-fat32
    echo    "done."

    echo -n "   Creating fat32 filesystem in ev3dev.img ... "
    eval mkfs.msdos -n EV3DEV_FAT32 "/dev/mapper/loop?-ev3dev-1" > /dev/null 2>&1
    echo    "done"
fi

echo    "-------------------------------------------------------------------------------"
echo -n "   Type \"Yes\" to create a fresh ext3 file system on Partition 2 ... "
read YesNo

if [ "${YesNo}" = "Yes" ]; then

    echo -n "   Checking for ev3dev-ext3 mountpoint, will create if needed ... "
    [ -e ev3dev-ext3 ] && [ ! -d ev3dev-ext3 ] && die "ev3dev-ext3 exists, but it's a file!"
    [ ! -e ev3dev-ext3 ] && mkdir ev3dev-ext3
    echo    "done."

    echo -n "   Creating ext3 filesystem in ev3dev.img ... "
    eval mkfs.ext3 -L EV3DEV_EXT3 "/dev/mapper/loop?-ev3dev-2" > /dev/null 2>&1
    echo    "done"
fi

sync

echo    "-------------------------------------------------------------------------------"
echo    "   Unmapping partitions from ev3dev.img ... "
echo

kpartx -vlsd -p"-ev3dev-" ./ev3dev.img

echo    "-------------------------------------------------------------------------------"
exit