#! /bin/sh
#
# x10d_fstab  - add detected devices to fstab (for live system)
#
# Author: Michael Towers (larch42 at googlemail dot com)
#
# This file is part of the larch project.
#
#    larch is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    larch is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with larch; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
#----------------------------------------------------------------------------
# 2009.10.01

# Passing '-n' as command-line option will just report on the
# changes that would be made, nothing will be written to /etc/fstab.
# Otherwise if /etc/fstab.larch exists the script will do nothing at all.

# Get a list of partitions which could, potentially be mounted.
# Return the device basename, a tag: '+' for removable or '-' for not,
# and the detected file-system type, space separated.

# Note that paths within /sys might prove to be a bit variable

usables ()
{
    blkid -c /dev/null -s TYPE | sed -r s'|:.*=| |' |  tr -d \" | \
        while read dev type; do
            # Ignore if type is "swap", these are included by the initramfs
            if [ "${type}" = "swap" ]; then
                continue
            fi
            # Ignore if type is "lvm2pv"
            if [ "${type}" = "lvm2pv" ]; then
                continue
            fi
            part=${dev:5}
            bdev=${part:0:3}
            # skip loop devices
            [ "${bdev}" = "loo" ] && continue
            echo -n "${part}"
            if [ $( cat /sys/block/${bdev}/removable 2>/dev/null ) -ne 0 ]; then
                echo -n " + "
            else
                echo -n " - "
            fi
            echo "${type}"
        done
}

 # This may be useful, too:
 #blkid -o value -s UUID -s TYPE /dev/sda8

# test if the script is started by root user. If not, exit
if [ $UID -ne 0 ]; then
    echo "Only root can run ${APP}"; exit 1
fi

# In addition, mountpoints will be generated
MNT=/mnt

if [ "$1" = "-n" ]; then
    DST=""
elif [ -f /etc/fstab.larch ]; then
    exit
else
    DST=">>/etc/fstab"
    if [ -n "$( df | grep " ${MNT}" )" ]; then
        echo "ERROR: Mounted filesystem at/within ${MNT}"
        exit 1
    fi
    mkdir -p ${MNT}
    rm -rf ${MNT}/*
fi

# Get usable partitions, but only fixed ones
usables | while read part rem fstype; do
        if [ "${rem}" = "+" ]; then
            # Removable
            continue
        fi
        mp=$( basename ${part} )
        if [ "${fstype}" = "ntfs" ]; then
            eval printf '"/dev/%-12s %-12s %-8s users,noauto,utf8,umask=0   0 0\n"' \
                    ${part} ${MNT}/${mp} ntfs-3g ${DST}
        elif [ "${fstype}" = "vfat" ]; then
            eval printf '"/dev/%-12s %-12s %-8s users,noauto,utf8,umask=0   0 0\n"' \
                    ${part} ${MNT}/${mp} vfat ${DST}
        else
            eval printf '"/dev/%-12s %-12s %-8s users,noauto,noatime   0 0\n"' \
                    ${part} ${MNT}/${mp} ${fstype} ${DST}
        fi
        if [ -n "${DST}" ]; then
            mkdir -p ${MNT}/${mp}
        fi
    done

### CD devices
#if [ -f /proc/sys/dev/cdrom/info ]; then
#    for dev in $( cat /proc/sys/dev/cdrom/info 2>/dev/null | head -n 3 | \
#            tail -n 1 | cut -d ":" -f 2 ); do
#        mountdir="${dev}_cd"
#        mkdir ${MNT}/${mountdir}
#        eval printf '"%-12s %-12s %-8s user,noauto,exec,unhide 0     0\n"' \
#                /dev/${dev} /mnt/${mountdir} auto >>${DEST}
#    done
#fi

#eval echo ${DST}
#eval echo "# This would do for a floppy" ${DST}
#eval echo "#/dev/fd0        /mnt/floppy    vfat,ext2 rw,user,noauto,noatime    0     0" ${DST}
#eval echo "#    +   mkdir /mnt/floppy" ${DST}
#eval echo ${DST}
#eval echo "# E.g. for USB storage:" ${DST}
#eval echo "#/dev/sdb1        /mnt/usb      auto      rw,user,noauto,noatime   0     0" ${DST}
#eval echo "#    +   mkdir /mnt/usb" ${DST}