Date: Tue, 2 Sep 1997 15:24:32 -0500 (CDT) From: "Lee Crites (AEI)" <leec@adam.adonai.net> To: freebsd-questions@freebsd.org Subject: Check for dos floppy/floppy write protected... Message-ID: <Pine.BSF.3.95.970902150002.10472A-100000@adam.adonai.net>
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I glanced at the thread about checking to see if a floppy is write
protected. Unfortuantely, I did not check it closely enough to know for
sure which list it came from. However, since I didn't remember seeing
the inevitable "don't ask -hackers" response, I assumed it was to
-questions, so that is where my reply is going...
I have three scripts for each of my floppy drives which take care of
mounting, unmounting, and checking the floppy. They work for me and my
limited uses of them. Your mileage, as they say, my vary. Here they
are, for your personal pleasure and enjoyment. You'll laugh; you'll
cry; you'll hurl... ;)
Remember, we're talking about msdos compatible floppies here. Also, I
have a /floppy directory which I use as the base for the floppy drives.
I also have /floppy/A and /floppy/B for, you guessed it, the A and B
floppy drives. This has long ago since become nothing more than a
nomenclature for this system since FreeBSD is the only os on it. But
since I have a large "A" on the 3.5" and "B" on the 5.25" drives, it
still has some meaning to me. In each of the two directories, I have a
file called "nothing.is.mounted" (touch /floppy/A/nothing.is.mounted)
which can only be seen if no floppy drive has been mounted.
So to set up for these scripts, do the following (logged in with root
permissions):
* mkdir /floppy
* mkdir /floppy/A
* mkdir /floppy/B
* touch /floppy/A/nothing.is.mounted
* touch /floppy/B/nothing.is.mounted
* chmod -R 777 /floppy
* chown -R root.wheel /floppy
Just for giggles and grins, I also have a /scripts directory into which
I place all sorts of fun things like these. But that's a different
story...
This script checks to see if a floppy looks like it has been mounted.
It assumes you know what you want, so if it sees something that looks
like it has been mounted it will unmount it first. Finally, it mounts
the floppy using mount_msdos. There are some who don't like using the
mount_xxx commands, and their arguments are good. If you don't like
that plan, pitch these scripts.
#!/bin/csh -f
#
# Mount the A floppy drive.
#
echo "Mounting the A floppy (3.50)..."
if ! ( -e /floppy/A/nothing.is.mounted ) then
echo " -- already mounted, removing old version"
umount /floppy/A
endif
mount_msdos /dev/fd0 /floppy/A && goto GotIt
echo " -- error mounting floppy"
exit
GotIt:
echo " -- floppy mounted"
This will just unmount the floppy.
#!/bin/csh -f
#
# Unmount the A floppy drive.
#
echo "Unmounting the A floppy..."
if ( -e /floppy/A/nothing.is.mounted ) then
echo " -- nothing mounted"
exit
endif
umount /floppy/A
This one assumes a floppy has been mounted but does not assume what the
path to it is. Actually, I use this on more than just my FreeBSD
server, so it had to have something just a little different. It checks
the df -k command for the /dev/fd0 line, grabs the path from it, and
tries to create a dummy file there. If the file can be created, guess
what -- the floppy is writeable. SO..... That's what I try to do.
Write a file then check for it. IF it's there, remove it and tell me
the floppy is writeable.
#!/bin/csh -f
#
# This will check to see if the floppy is write-protected.
# -- this assumes the A drive is /dev/fd0
#
echo "Checking to see if floppy is writable"
#
# Grab the pathname from the df command
#
set fdir = `df -k|grep /dev/fd0|awk '{print $6}'`
#
# See if we got something.
#
if ( "$fdir" == "" ) then
echo " -- df could not find the floppy drive"
exit
endif
#
# Try to write something there.
#
touch $fdir/goober.goo >>& /dev/null
#
# See if it is there.
#
if ! ( -e $fdir/goober.goo ) then
echo " -- floppy write protected"
exit
endif
#
# If we are here, the floppy is writeable
#
rm -f $fdir/goober.goo
echo " -- floppy is writeable"
#
# done
#
I have a set of scripts called mountA, umountA, and checkA (the ones
which are enclosed). I also have mountB, umountB, and checkB. That
rounds out my msdos floppy set. I also used some stuff from Greg
Lehey's book to make a mounta and mountb -- notice the case of A/B. If
anyone cares, I can toss those into a message as well.
Lee
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