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#ident	"@(#)sadmin:admin/makefsys	2.12"
#	Create a new file system on a removable medium.
#help# 
#help#	Makefsys creates a new file system on a removable medium which can
#help#	then store data which you do not wish to keep on the built-in disks.
#help#	When "mounted", the file system has all the properties of a
#help#	file kept on the built-in disks.

#!	chmod +x ${file}

set -e

#	With gap == 1 the blocks/cylinder has no effect in the file system.
#	Since most formatting routines lay the sectors out in an optimal
#	way, gap == 1 is a reasonable assumption.
gap=1		# rotational gap size
blockcyl=32	# blocks/cylinder

trap 'exit 0' 1 2 15
flags="-qq -k$$"

usage () {
	echo >&2 "Usage:  `basename $0` [ -p pattern ]"
	exit 1
}

patterns=
case $# in
0 )
	;;
2 )
	if [ $1 = -p ]
	then
		patterns=$2
		shift 2
	else
		usage
	fi
	;;
* )
	usage
esac

dir=${0}.d
if [ -z "${patterns}"  -a  -d ${dir} ]
then
	patterns=`ls ${dir} 2>/dev/null`
fi

ddrive=`selectdevice -b $$ /dev/SA ${patterns}`
ndrive=`drivename ${ddrive}`

if [ -n "${patterns}" ]
then
	. ${dir}/`selpattern ${ddrive}`
fi

l=`disklabel -n "${ndrive}" $$ ${ddrive}`
eval `labelfsname "${l}"`

if [ -n "${label}"  -o  -n "${fsname}" ]
then
	echo "This medium already has a label and/or file system name.
	${label:+label = ${label}		}${fsname:+file system name = ${fsname}}"
	checkyn ${flags} -f \
	'
	WARNING:  If you answer "yes", all data on this medium will be LOST!
	BE SURE THIS IS WHAT YOU WANT TO DO!!
Do you want to erase this file system and build another?'  ||  {
		echo 'This medium will not be erased.  Remove the medium.'
		exit 0
	}
fi

label=`checkre ${flags} ${label:+-D${label}} -H'
	The medium label identifies this particular medium.
	Usually it is the initials or name of the owner and a number,
	for example "liz001".
	The label may be no more than 6 characters long.' -fe \
	"Enter the label to be put on the medium ${label:+(default: ${label})} [?, q]" \
	'^.\{1,6\}$' 'Must be at least one and no more than 6 characters.' \
	'^[!-~]*$' 'Must be printing characters only only.'`

fsname=`checkre ${flags} ${fsname:+-D${fsname}} -H'
	The file system name is the name of the directory where you want the
	file system mounted.  It determines the first name in the full path
	names of the files it contains.  Thus if you specify "ray" as the
	file system name, the file system will be mounted on directory "/ray"
	and all file names will begin with "/ray/".' -fe \
	"Enter the file system name ${fsname:+(default: ${fsname})} [?, q]" \
	'^/\{0,1\}.\{1,6\}$' 'Must be at least one and no more than 6 characters.' \
	'^/\{0,1\}[a-zA-Z0-9]*$' 'Must be letters and numbers only.'`

fsname=`expr ${fsname} : '/*\(.*\)'`

blocks=`spclsize -b ${ddrive}`
#	Funny calculation of inodes gives nice multiple-of-10 values.
inodes=`expr ${blocks} / 70 \* 10`
halfblocks=`expr ${blocks} / 2`
while true
do
	i=`checkre ${flags} -fe -D "${inodes}" \
		"Enter the maximum number of files and directories on this medium
	(default ${inodes}) [q]:" \
		'^[0-9]\{1,\}$' 'You must enter a number or just press RETURN.' \
		-R '^00*$' 'The number must be greater than zero.'`
	if [ ${i} -lt ${halfblocks} ]
	then
		break
	fi
	echo "The number of files and directories must be less than ${halfblocks}."
done
#	So  df -t  reports what was requested.
inodes=`expr ${i} + 8`

echo "Building '${fsname}' file system on '${label}'."
sleep 2

trap 'exit 1' 1 2 15
trap '	trap "" 1 2
	cat -s /tmp/$$makefsys;  rm -f /tmp/$$makefsys;  exit 1' 0

# The echo writes over the beginning of the first block, which mkfs(1M) does not.
# This helps make the medium not recognizable as other than a file system.
echo '                                                            ' >${ddrive}
/etc/mkfs ${ddrive} ${blocks}:${inodes} ${gap} ${blockcyl} >/tmp/$$makefsys 2>&1  ||
	exit 1
/etc/labelit ${ddrive} ${fsname} ${label} >>/tmp/$$makefsys 2>&1  ||  exit 1
sync
rm /tmp/$$makefsys

set -e

if [ ! -d /${fsname} ]
then
	mkdir /${fsname}
fi
chmod 777 /${fsname}
/etc/mount ${ddrive} /${fsname}  ||  {
	admerr $0 mount of ${ddrive} on /${fsname} failed.
	exit 1
}

trap "	trap '' 1 2
	cd /;  diskumount -n '${ndrive}' ${ddrive} /${fsname}" 0

echo "Initializing '${fsname}' file system."
cd /${fsname}
umask 000
mkdir lost+found
cd lost+found
set +e
#	Populate the lost+found directory to grow it to a usable size.
i=`expr ${inodes} / 40 + 1`
while [ ${i} -gt 0 ]
do
	tee ${i}1 ${i}2 ${i}3 ${i}4 ${i}5 ${i}6 ${i}7 ${i}8 ${i}9 ${i}0 </dev/null
	i=`expr ${i} - 1;  exit 0`	# exit 0 should not be needed, but is.
done
rm -fr .

if checkyn ${flags} -f -H '
	If you leave the file system mounted, then you can use it right now.
	Otherwise, this procedure will unmount it.' \
	"Do you want to leave '/${fsname}' mounted?"
then
	sync
	trap 0
	echo 'Mounted.  DO NOT REMOVE THE MEDIUM UNTIL IT IS UNMOUNTED!'
fi
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