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raspberrymatic-addon-rmupdate/resize_image.sh

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#!/bin/bash -e
LOOP_DEV=4
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BOOT_SIZE=$((100*1024*1024))
ROOT_SIZE=$((1900*1024*1024))
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USR_LOCAL_SIZE=$((2*1024*1024))
if [[ $EUID -ne 0 ]]; then
echo "This script must be run as root." 1>&2
exit 1
fi
image_file="$(realpath $1)"
new_image_file="${image_file/\.img/\.adjusted\.img}"
if [[ ! $image_file =~ .*\.img ]]; then
echo "Not an image file: ${image_file}." 1>&2
exit 1
fi
echo "image: ${image_file}"
echo "adjusted image: ${new_image_file}"
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echo "*** Creating new image file and partitions ***"
dd if=/dev/zero of=$new_image_file bs=1M count=$((((${BOOT_SIZE}+${ROOT_SIZE}+${USR_LOCAL_SIZE})/1024/1024)+1))
parted --script $new_image_file \
mklabel msdos \
mkpart primary fat16 512B ${BOOT_SIZE}B \
set 1 boot on \
mkpart primary ext4 $((512+${BOOT_SIZE}))B $((${BOOT_SIZE}+${ROOT_SIZE}))B \
mkpart primary ext4 $((512+${BOOT_SIZE}+${ROOT_SIZE}))B 100%
echo "*** Copying original partitons ***"
oIFS="$IFS"
IFS=$'\n'
for line in $(parted $image_file unit B print | grep primary); do
IFS=$oIFS
x=($line)
num=${x[0]}
start=$((${x[1]:0: -1}/512))
size=$((${x[3]:0: -1}/512))
echo $num - $start - $size
seek=0
[ "$num" = "1" ] && seek=$start
[ "$num" = "2" ] && seek=$(((512+${BOOT_SIZE})/512))
[ "$num" = "3" ] && seek=$(((512+${BOOT_SIZE}+${ROOT_SIZE})/512))
dd if=$image_file of=$new_image_file bs=512 skip=$start count=$size seek=$seek conv=notrunc
done
echo "*** Resizing filesystems ***"
rm /dev/mapper/loop${LOOP_DEV}p 2>/dev/null || true
kpartx -d /dev/loop${LOOP_DEV} 2>/dev/null || true
losetup -d /dev/loop${LOOP_DEV} 2>/dev/null || true
losetup /dev/loop${LOOP_DEV} $new_image_file
kpartx -a /dev/loop${LOOP_DEV}
ln -s /dev/loop${LOOP_DEV} /dev/mapper/loop${LOOP_DEV}p
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#fsck.vfat -a /dev/mapper/loop${LOOP_DEV}p1
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fatresize --size $BOOT_SIZE /dev/mapper/loop${LOOP_DEV}p1
fsck.ext4 -f -y /dev/mapper/loop${LOOP_DEV}p2
resize2fs /dev/mapper/loop${LOOP_DEV}p2
fsck.ext4 -f -y /dev/mapper/loop${LOOP_DEV}p3
resize2fs /dev/mapper/loop${LOOP_DEV}p3
rm /dev/mapper/loop${LOOP_DEV}p
kpartx -d /dev/loop${LOOP_DEV}
losetup -d /dev/loop${LOOP_DEV}
echo "*** Resized image successfully created ***"