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|
#!/bin/bash
# scsi_ch_swp
#
# Script to change the Software Read Protect (SWP) state of a disk in Linux.
# When '-s <n>' (or '--set <n>') is not given then read SWP state.
#
# Uses sdparm and blockdev utilities.
#
# Douglas Gilbert 20130606
rdonly="--readonly"
swp="-1"
verbose=""
bdverbose=""
usage()
{
echo "Usage: scsi_ch_swp [-h] [-s 0|1] [-v] [-w] <blk_device>"
echo " where:"
echo " -h, --help print usage message"
echo " -s 0|1, --set 0|1 where:"
echo " 0 - clear SWP and set RW mode"
echo " 1 - set SWP and set RO mode"
echo " (default: read SWP and get RO flag)"
echo " -v, --verbose more verbose, show commands invoked"
echo " -w, --wr access <blk_device> read-write when '-s 0'"
echo " (default: access read-only in this case)"
echo ""
echo "Access the Software Write Protect (SWP) bit in the SCSI control"
echo "mode page and if changed adjust the Linux block device (e.g."
echo "/dev/sdc) settings accordingly. If supported, when the SWP bit"
echo "is set (1) the device is read-only; when clear (0) the device"
echo "is read-write (i.e. its contents can be read and changed)."
echo "When no options given it reads SWP and gets blockdev's RO flag."
}
opt="$1"
while test ! -z "$opt" -a -z "${opt##-*}"; do
opt=${opt#-}
case "$opt" in
h|-help) usage ; exit 0 ;;
s|-set) shift ; let swp=$1 ;;
v|-verbose) verbose="-v" ;;
w|-wr) rdonly="" ;;
vv) verbose="-vv" ;;
vvv) verbose="-vvv" ;;
*) echo "Unknown option: -$opt " ; exit 1 ;;
esac
shift
opt="$1"
done
if [ $# -lt 1 ] ; then
echo "Need at least a <blk_device> argument."
echo ""
usage
exit 1
fi
if [ ${verbose} ] ; then
bdverbose="-v"
fi
if ( which sdparm >/dev/null 2>&1 ) ; then
true
else
echo "sdparm not found"
sdparm ${rdonly} ${verbose}
fi
if ( which blockdev >/dev/null 2>&1 ) ; then
true
else
echo "blockdev not found"
blockdev
fi
if [ $swp -lt 0 ] ; then
if [ ${verbose} ] ; then
echo sdparm --quiet ${rdonly} ${verbose} --get=SWP=1 $1
fi
sdparm --quiet ${rdonly} ${verbose} --get=SWP=1 $1
if [ ${bdverbose} ] ; then
echo "blockdev --getro ${bdverbose} $1"
fi
echo -n "blockdev's RO flag: "
blockdev --getro ${bdverbose} $1
elif [ $swp = "0" ] ; then
if [ ${verbose} ] ; then
echo sdparm --quiet ${rdonly} ${verbose} --clear=SWP $1
fi
sdparm --quiet ${rdonly} ${verbose} --clear=SWP $1
res=$?
if [ $res -ne 0 ] ; then
exit $res
fi
if [ ${bdverbose} ] ; then
echo blockdev --setrw ${bdverbose} $1
fi
blockdev --setrw ${bdverbose} $1
# res=$?
# if [ $res -ne 0 ] ; then
# exit $res
# fi
## There is still some uncertainity whether calling blockdev --rereadpt
## is needed or defeats this operation. Feedback please.
# # Need to re-read partition table before --setro takes effect
# if [ ${bdverbose} ] ; then
# echo blockdev --rereadpt ${bdverbose} $1
# fi
# blockdev --rereadpt ${bdverbose} $1
elif [ $swp = "1" ] ; then
if [ ${verbose} ] ; then
echo sdparm --quiet ${verbose} --set=SWP $1
fi
sdparm --quiet ${verbose} --set=SWP $1
res=$?
if [ $res -ne 0 ] ; then
exit $res
fi
if [ ${bdverbose} ] ; then
echo blockdev --setro ${bdverbose} $1
fi
blockdev --setro ${bdverbose} $1
# res=$?
# if [ $res -ne 0 ] ; then
# exit $res
# fi
## There is still some uncertainity whether calling blockdev --rereadpt
## is needed or defeats this operation. Feedback please.
# # Need to re-read partition table before --setrw takes effect
# if [ ${bdverbose} ] ; then
# echo blockdev --rereadpt ${bdverbose} $1
# fi
# blockdev --rereadpt ${bdverbose} $1
else
echo "option --set ${swp} is invalid"
exit 1
fi
|
