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#!/bin/sh
#
# SPDX-License-Identifier: GPL-2.0-only
#
# 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 $IMG)"
echo ""
}
device_details() {
BLOCK_SIZE=512
echo "Device details"
echo "=============="
# Collect disk info using diskutil on Mac OS
if [ "$(uname)" = "Darwin" ]; then
diskutil info $DEVICE | egrep "(Device Node|Media Name|Total Size)"
return
fi
# Default / Linux information collection
ACTUAL_DEVICE=`readlink -f $DEVICE`
DEV=`basename $ACTUAL_DEVICE`
if [ "$ACTUAL_DEVICE" != "$DEVICE" ] ; then
echo " device: $DEVICE -> $ACTUAL_DEVICE"
else
echo " device: $DEVICE"
fi
if [ -f "/sys/class/block/$DEV/device/vendor" ]; then
echo " vendor: $(cat /sys/class/block/$DEV/device/vendor)"
else
echo " vendor: UNKNOWN"
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 ""
}
check_mount_device() {
if cat /proc/self/mounts | awk '{ print $1 }' | grep /dev/ | grep -q -E "^$1$" ; then
return 0
fi
return 1
}
is_mounted() {
if [ "$(uname)" = "Darwin" ]; then
if df | awk '{ print $1 }' | grep /dev/ | grep -q -E "^$1(s[0-9]+)?$" ; then
return 0
fi
else
if check_mount_device $1 ; then
return 0
fi
DEV=`basename $1`
if [ -d /sys/class/block/$DEV/ ] ; then
PARENT_BLKDEV=`basename $(readlink -f "/sys/class/block/$DEV/..")`
if [ "$PARENT_BLKDEV" != "block" ] ; then
if check_mount_device $PARENT_BLKDEV ; then
return 0
fi
fi
for CHILD_BLKDEV in `find /sys/class/block/$DEV/ -mindepth 1 -maxdepth 1 -name "$DEV*" -type d`
do
if check_mount_device /dev/`basename $CHILD_BLKDEV` ; then
return 0
fi
done
fi
fi
return 1
}
is_inuse() {
HOLDERS_DIR="/sys/class/block/`basename $1`/holders"
if [ -d $HOLDERS_DIR ] && [ `ls -A $HOLDERS_DIR` ] ; then
return 0
fi
return 1
}
if [ $# -ne 2 ]; then
usage
exit 1
fi
IMAGE=$1
DEVICE=$2
if [ ! -e "$IMAGE" ]; then
echo "ERROR: Image $IMAGE does not exist"
usage
exit 1
fi
if [ "$(uname)" = "Darwin" ]; then
# readlink doesn't support -f on MacOS, just assume it isn't a symlink
ACTUAL_DEVICE=$DEVICE
else
ACTUAL_DEVICE=`readlink -f $DEVICE`
fi
if is_mounted $ACTUAL_DEVICE ; then
echo "ERROR: Device $DEVICE is currently mounted - check if this is the right device, and unmount it first if so"
device_details
exit 1
fi
if is_inuse $ACTUAL_DEVICE ; then
echo "ERROR: Device $DEVICE is currently in use (possibly part of LVM) - check if this is the right device!"
device_details
exit 1
fi
if [ ! -w "$DEVICE" ]; then
echo "ERROR: Device $DEVICE does not exist or is not writable"
usage
exit 1
fi
image_details $IMAGE
device_details
printf "Write $IMAGE to $DEVICE [y/N]? "
read RESPONSE
if [ "$RESPONSE" != "y" ]; then
echo "Write aborted"
exit 0
fi
echo "Writing image..."
if which pv >/dev/null 2>&1; then
pv "$IMAGE" | dd of="$DEVICE" bs="$BLOCKSIZE"
else
dd if="$IMAGE" of="$DEVICE" bs="$BLOCKSIZE"
fi
sync
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