Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!ogicse!ucsd!ucsdhub!hp-sdd!hplabs!hpfcso!hpfcmgw!hpfcse!hpuecoz!hpuecoa!speclab!rclark
From: rclark@speclab.bgp-usgs.gov (Roger N. Clark)
Newsgroups: comp.sys.hp
Subject: Re: removable r/w optical disk
Message-ID: <210045@speclab.bgp-usgs.gov>
Date: 26 Feb 90 18:26:07 GMT
References: <E5co$i@cs.psu.edu>
Organization: U.S. Geological Survey, Branch of Geophysics, Denver
Lines: 157

> We just installed the r/w optical disk on our HP9000/300 running HP-UX6.5.
> We want each user to be able to have a mount point in their home directory
> and mount/umount the optical disk.
> Is there any way to mount/umount file system without being a superuser.

We have an optical disk and have the same problem.  Below is a
simple mount and unmount program.  They get installed as set UID
root.  On our system, the optical disk is /i2 and the users can only
mount and unmount /i2, but you can change /i2 to anything you want.

If a user is using a disk, another user can't unmount it as long as
a process has a directory on /i2 as a working directory.

There is no manual, but the c programs are 2 lines long and should
be obvious.  Root should run the make.

<add standard disclaimer here>

Roger Clark
..!speclab!rclark



#---------------------------------- cut here ----------------------------------
# This is a shell archive.  Remove anything before this line,
# then unpack it by saving it in a file and typing "sh file".
#
# Wrapped by Roger N. Clark <rclark@speclab> on Mon Feb 26 10:48:52 1990
#
# This archive contains:
#	makefile	mounti2.c	umounti2.c	
#
# Existing files will not be overwritten.
# Error checking via wc(1) will be performed.
# Error checking via sum(1) will be performed.

unset LANG

if sum -r </dev/null >/dev/null 2>&1
then
	sumopt='-r'
else
	sumopt=''
fi

if test -f makefile
then
	echo Ok to overwrite existing file makefile\?
	read answer
	case "$answer" in
	[yY]*)	echo Proceeding;;
	*)	echo Aborting; exit 1;;
	esac
	rm -f makefile
	if test -f makefile
	then
		echo Error: could not remove makefile, aborting
		exit 1
	fi
fi
echo x - makefile
cat >makefile <<'@EOF'
all:	/usr/bin/mounti2 /usr/bin/umounti2

/usr/bin/mounti2:	mounti2.c
	cc -o mounti2 mounti2.c
	mv mounti2 /usr/bin/mounti2
	chmod 4555 /usr/bin/mounti2

/usr/bin/umounti2:	umounti2.c
	cc -o umounti2 umounti2.c
	mv umounti2 /usr/bin/umounti2
	chmod 4555 /usr/bin/umounti2
@EOF
set `sum $sumopt <makefile`; if test $1 -ne 10738
then
	echo ERROR: makefile checksum is $1 should be 10738
fi
set `wc -lwc <makefile`
if test $1$2$3 != 1127271
then
	echo ERROR: wc results of makefile are $* should be 11 27 271
fi

chmod 644 makefile

if test -f mounti2.c
then
	echo Ok to overwrite existing file mounti2.c\?
	read answer
	case "$answer" in
	[yY]*)	echo Proceeding;;
	*)	echo Aborting; exit 1;;
	esac
	rm -f mounti2.c
	if test -f mounti2.c
	then
		echo Error: could not remove mounti2.c, aborting
		exit 1
	fi
fi
echo x - mounti2.c
cat >mounti2.c <<'@EOF'
main()
{
	system ("/etc/mount /dev/dsk/c6d0s2 /i2");
	system ("/bin/chmod 775 /i2");
}
@EOF
set `sum $sumopt <mounti2.c`; if test $1 -ne 25919
then
	echo ERROR: mounti2.c checksum is $1 should be 25919
fi
set `wc -lwc <mounti2.c`
if test $1$2$3 != 51187
then
	echo ERROR: wc results of mounti2.c are $* should be 5 11 87
fi

chmod 644 mounti2.c

if test -f umounti2.c
then
	echo Ok to overwrite existing file umounti2.c\?
	read answer
	case "$answer" in
	[yY]*)	echo Proceeding;;
	*)	echo Aborting; exit 1;;
	esac
	rm -f umounti2.c
	if test -f umounti2.c
	then
		echo Error: could not remove umounti2.c, aborting
		exit 1
	fi
fi
echo x - umounti2.c
cat >umounti2.c <<'@EOF'
main()
{
	system ("/etc/umount /i2");
	system ("/bin/chmod 000 /i2");
}
@EOF
set `sum $sumopt <umounti2.c`; if test $1 -ne 43000
then
	echo ERROR: umounti2.c checksum is $1 should be 43000
fi
set `wc -lwc <umounti2.c`
if test $1$2$3 != 51072
then
	echo ERROR: wc results of umounti2.c are $* should be 5 10 72
fi

chmod 644 umounti2.c

exit 0