48 lines
1.1 KiB
Bash
48 lines
1.1 KiB
Bash
|
command -v dd &>/dev/null || return 0
|
||
|
|
|
||
|
|
utils.dd() {
|
||
|
|
local ARGS=()
|
||
|
|
|
||
|
|
# "byte size" dd default is 512-bytes, but 4M is modern sweet spot
|
||
|
|
local bs=4M
|
||
|
|
|
||
|
|
# show the progress bar (I can never remember to include this)
|
||
|
|
local status=progress
|
||
|
|
|
||
|
|
# By default, dd goes through kernel write cache which means dd could
|
||
|
|
# report "Done" but the kernel is still flushing data to the USB in
|
||
|
|
# the background. Disconnecting the USB drive at that point will
|
||
|
|
# corrupt the image
|
||
|
|
#
|
||
|
|
# synchronous mosde is slower, but forces each write to hit the
|
||
|
|
# physical device before dd moves on to the next block
|
||
|
|
#
|
||
|
|
# tl;dr "synchronous" mode = Done means Done
|
||
|
|
local oflag=sync
|
||
|
|
|
||
|
|
local _S
|
||
|
|
while [[ ${#} -gt 0 ]]
|
||
|
|
do
|
||
|
|
_S=1
|
||
|
|
case ${1} in
|
||
|
|
( bs=* ) bs='' ; ARGS+=(${1}) ;;
|
||
|
|
( status=* ) status='' ; ARGS+=(${1}) ;;
|
||
|
|
( oflag=* ) oflag='' ; ARGS+=(${1}) ;;
|
||
|
|
( * ) ARGS+=(${1}) ;;
|
||
|
|
esac
|
||
|
|
|
||
|
|
shift ${_S} || {
|
||
|
|
echo "ERROR missing argument for '${1}'"
|
||
|
|
return 1
|
||
|
|
}
|
||
|
|
done
|
||
|
|
|
||
|
|
local my_default
|
||
|
|
for my_default in bs status oflag
|
||
|
|
do
|
||
|
|
[ "${(P)my_default}" ] && ARGS+=("${my_default}=${(P)my_default}")
|
||
|
|
done
|
||
|
|
|
||
|
|
dd ${ARGS[@]}
|
||
|
|
}
|