#!/bin/sh
#----------------------------------------------------------------------------
# /etc/boot.d/volume.inc
# Functions for finding/mounting/unmounting volumes.
#
# Last Update:  $Id$
#----------------------------------------------------------------------------

# List all block-devices excluding the raw device if partitions exist on it
scandevices()
{
  lastdev=''
  for dev in `sed -n '/ 1 [a-z]/d;s/^[ 0-9]\+\([^ 0-9#]\+[0-9]\{0,1\}\)$/\1/p' /proc/partitions | sed '/sr[0-9]/d'`
  do
    basedev=`echo $dev | sed 's/[0-9]\+//'`
    if [ "$lastdev" != "$basedev" ]
    then
      if [ -n "$lastdev" ]
      then
        echo $lastdev
      fi
    fi
    lastdev=$dev
  done
  if [ -n "$lastdev" ]
  then
    echo $lastdev
  fi
}

# Checks an unmounted filesystem.
# $1 = device
# $2 = file system
check_fs()
{
    case $2 in
    vfat)
        if type -p fsck.fat >/dev/null
        then
            fsck.fat -c 850 -a "$1"
        fi
        ;;
    ext2|ext3|ext4)
        if type -p e2fsck >/dev/null
        then
            e2fsck -p -C 0 "$1"
        fi
        ;;
    *)
        return 0
        ;;
    esac
}

# Mounts a volume. Checks its file system if possible before mounting.
# $1 = device
# $2 = mount path
# $3 = file system (vfat, ext[234])
# $4 = mount options (rw, ro, ...)
mount_volume()
{
    local opt=$4
    [ -n "$opt" ] && opt="-o $opt"

    check_fs $1 $3
    local rc=$?
    if [ $rc -gt 1 ]
    then
        log_error "File system check failed for $1 (return code $rc)! Mount aborted!"
        return 1
    elif ! mount -t $3 $opt $1 "$2"
    then
        log_error "Unable to mount volume $1 on $2!"
        return 2
    else
        return 0
    fi
}