#! /bin/sh

DISK=/dev/mmcblk1

PARTNUM="$(sgdisk -p $DISK|grep writable|sed -r 's/^([^ ]*[ ]*){1}([^ ]*).*/\2/')"

GUID="$(sgdisk -i $PARTNUM $DISK|grep unique| sed 's/^.*: //g')"
FIRST="$(sgdisk -i $PARTNUM $DISK|grep ^First| sed 's/^.*: //g;s/ .*$//')"

echo $PARTNUM $FIRST $GUID

# delete part $PARTNUM
sgdisk -d $PARTNUM $DISK

# create part $PARTNUM starting at $FIRST
sgdisk -n $PARTNUM:$FIRST:0 $DISK

# set $GUID for $PARTNUM
sgdisk -u $PARTNUM:$GUID $DISK

# set name of $PARTNUM to "writable"
sgdisk -c $PARTNUM:writable $DISK

e2fsck -f ${DISK}${PARTNUM}
resize2fs ${DISK}${PARTNUM}