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#!/bin/sh
# Default to avoiding the first two disks on typical Linux and Mac OS installs
# Better safe than sorry :-)
BLACKLIST_DEVICES="/dev/sda /dev/sdb /dev/disk1 /dev/disk2"
# 1MB blocksize
BLOCKSIZE=1048576
usage() {
echo "Usage: $(basename $0) IMAGE DEVICE"
}
image_details() {
IMG=$1
echo "Image details"
echo "============="
echo " image: $(basename $IMG)"
# stat format is different on Mac OS and Linux
if [ "$(uname)" = "Darwin" ]; then
echo " size: $(stat -L -f '%z bytes' $IMG)"
echo " modified: $(stat -L -f '%Sm' $IMG)"
else
echo " size: $(stat -L -c '%s bytes' $IMG)"
echo " modified: $(stat -L -c '%y' $IMG)"
fi
echo " type: $(file -L -b $IMG)"
echo ""
}
device_details() {
DEV=$1
BLOCK_SIZE=512
echo "Device details"
echo "=============="
# Collect disk info using diskutil on Mac OS
if [ "$(uname)" = "Darwin" ]; then
diskutil info $DEVICE | egrep "(Device Node|Media Name|Total Size)"
return
fi
# Default / Linux information collection
echo " device: $DEVICE"
if [ -f "/sys/class/block/$DEV/device/vendor" ]; then
echo " vendor: $(cat /sys/class/block/$DEV/device/vendor)"
else
echo " vendor: UNKOWN"
fi
if [ -f "/sys/class/block/$DEV/device/model" ]; then
echo " model: $(cat /sys/class/block/$DEV/device/model)"
else
echo " model: UNKNOWN"
fi
if [ -f "/sys/class/block/$DEV/size" ]; then
echo " size: $(($(cat /sys/class/block/$DEV/size) * $BLOCK_SIZE)) bytes"
else
echo " size: UNKNOWN"
fi
echo ""
}
if [ $# -ne 2 ]; then
usage
exit 1
fi
IMAGE=$1
DEVICE=$2
if [ ! -e "$IMAGE" ]; then
echo "ERROR: Image $IMAGE does not exist"
usage
exit 1
fi
for i in ${BLACKLIST_DEVICES}; do
if [ "$i" = "$DEVICE" ]; then
echo "ERROR: Device $DEVICE is blacklisted"
exit 1
fi
done
if [ ! -w "$DEVICE" ]; then
echo "ERROR: Device $DEVICE does not exist or is not writable"
usage
exit 1
fi
image_details $IMAGE
device_details $(basename $DEVICE)
printf "Write $IMAGE to $DEVICE [y/N]? "
read RESPONSE
if [ "$RESPONSE" != "y" ]; then
echo "Write aborted"
exit 0
fi
echo "Writing image..."
dd if="$IMAGE" of="$DEVICE" bs="$BLOCKSIZE"
sync
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