raspberrypi_image.sh

#!/usr/bin/env bash
# Install/dd a raspberry pi os image to SD card

if [ $# -lt 2 ]; then
	echo "rdisks:"
	diskutil list
	echo
	echo "images:"
	ls -t *.zip *.xz
	echo
	echo "usage: $0 <image.zip|xz> <rdiskpath>"
	exit
fi
zip="$1"
rdisk="$2"

sudo -v

set -x
test -s "$zip" 					|| exit
#test -b "$rdisk" 				|| exit
test -e "$rdisk" 				|| exit
diskutil unmountDisk "$rdisk" 			|| exit
unzip $1 || xz -k -d $1				|| exit
image="$(ls -t *.img | head -1)"
test -s "$image" 				|| exit
set +x
read -p "dd over $image? (ctrl+c for no)"
if [ "$(uname)" == "Darwin" ]; then
	BS="4m"
else
	BS="4M"
fi
set -x
sudo dd if="$image" of="$2" bs=$BS 		|| exit
rm -rf "$image"
set +x
echo done