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#!/bin/bash
ask() {
# http://djm.me/ask
local prompt default REPLY
while true; do
if [ "${2:-}" = "Y" ]; then
prompt="Y/n"
default=Y
elif [ "${2:-}" = "N" ]; then
prompt="y/N"
default=N
else
prompt="y/n"
default=
fi
# Ask the question (not using "read -p" as it uses stderr not stdout)
echo -n "$1 [$prompt] "
# Read the answer (use /dev/tty in case stdin is redirected from somewhere else)
read REPLY </dev/tty
# Default?
if [ -z "$REPLY" ]; then
REPLY=$default
fi
# Check if the reply is valid
case "$REPLY" in
Y*|y*) return 0 ;;
N*|n*) return 1 ;;
esac
done
}
if [[ $EUID -ne 0 ]]; then
echo ""
echo " This script must be run as root" 1>&2
echo ""
exit 1
fi
if [ -z "$1" ]; then
echo ""
echo " Flash a built image with an ATS Garage device config file baked in."
echo ""
echo " Usage: ./flash-configured-image.sh device [imagefile] "
echo ""
echo ""
echo " device : The device name to flash. Must be a removable device."
echo " Example: sdb"
echo ""
echo " imagefile : An image file generated by bitbake (optional)."
echo " Default: ./tmp/deploy/images/raspberrypi3/rpi-basic-image-raspberrypi3.rpi-sdimg-ota"
echo ""
echo " The following utilities are prerequisites:"
echo ""
echo " dd"
echo " parted"
echo " e2fsck"
echo " fdisk"
echo " resize2fs"
echo ""
exit 1
fi
set -euo pipefail
DEVICE_TO_FLASH=$1
IMAGE_TO_FLASH="${2-tmp/deploy/images/raspberrypi3/rpi-basic-image-raspberrypi3.rpi-sdimg-ota}"
DEVICE_IS_REMOVABLE=$(cat /sys/block/$DEVICE_TO_FLASH/removable)
if [[ $DEVICE_IS_REMOVABLE != "1" ]]; then
echo ""
echo " For safety, this script will only flash removable block devices."
echo ""
echo " This check is implemented by reading /sys/block/$DEVICE_TO_FLASH/removable."
echo ""
exit 1
fi
echo " "
echo " Writing image file: $IMAGE_TO_FLASH "
echo " to device : $DEVICE_TO_FLASH "
echo " "
if ask "Do you want to continue?" N; then
echo " "
else
exit 1
fi
if [ ! -f "$IMAGE_TO_FLASH" ]; then
echo " "
echo " Error: $IMAGE_TO_FLASH doesn't exist"
echo ""
exit 1
fi
echo "Unmounting all partitions on $DEVICE_TO_FLASH"
umount /dev/$DEVICE_TO_FLASH* || true
sleep 2
echo "Writing image to $DEVICE_TO_FLASH..."
dd if=$IMAGE_TO_FLASH of=/dev/$DEVICE_TO_FLASH bs=32M && sync
sleep 2
# It turns out there are card readers that give their partitions funny names, like
# "/dev/mmcblk0" will be the device, but the partitions are called "/dev/mmcblk0p1"
# for example. Better to just get the name of the partition after we flash it.
SECOND_PARTITION=$(fdisk -l /dev/$DEVICE_TO_FLASH | tail -n 1 | awk '{print $1}')
echo "Resizing rootfs partition to fill all of $DEVICE_TO_FLASH..."
parted -s /dev/$DEVICE_TO_FLASH resizepart 2 '100%'
sleep 2
e2fsck -f $SECOND_PARTITION || true
sleep 2
echo "Resizing filesystem on $SECOND_PARTITION to match partition size..."
resize2fs -p $SECOND_PARTITION
sleep 2
echo "Done!"
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