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#!/bin/sh
LOG="logger -p user.info -t mdev-mount"
WARN="logger -p user.warn -t mdev-mount"

MOUNTBASE=/media
MOUNTOPT="  -o iocharset=utf8"
MOUNTPOINT="$MOUNTBASE/$MDEV$MOUNTOPT"
ROOTDEV=$(readlink /dev/root)

# do not add or remove root device again...
[ "$ROOTDEV" = "$MDEV" ] && exit 0
if [ -e /tmp/.nomdevmount ]; then
   $LOG "no action on $MDEV -- /tmp/.nomdevmount exists"
   exit 0
fi

create_symlinks() {
   DEVBASE=${MDEV:0:3} # first 3 characters
   PARTNUM=${MDEV:3}   # characters 4-
   read MODEL < /sys/block/$DEVBASE/device/model
   MODEL=${MODEL// /_} # replace ' ' with '_'
   OLDPWD=$PWD
   cd $MOUNTBASE
   # this is a hack and will break with kernel updates, but so might DEVPATH :-(
   # and DEVPATH is not available at runtime, only at hotplug
   DEV_P=$(readlink /sys/block/$DEVBASE) # ../devices/...
   DEV_P=${DEV_P:2} # strip off '..'
   if which blkid > /dev/null; then
      BLKID=$(blkid /dev/$MDEV)
      eval ${BLKID#*:}
   fi
   if [ -n "$LABEL" ]; then
      rm -f "$LABEL"
      ln -s $MDEV "$LABEL"
   fi
   if [ -n "$UUID" ]; then
      LINK="${TYPE}${TYPE:+-}${UUID}"
      rm -f "${LINK}"
      ln -s $MDEV "${LINK}"
   fi
   if [ -n "$MODEL" ]; then
      LINK="${MODEL}${PARTNUM:+-}${PARTNUM}"
      rm -f "${LINK}"
      ln -s $MDEV "${LINK}"
   fi
   BUS=""
   PORT=""
   P=$DEV_P
   case "$P" in
   /devices/platform/stm-usb.?/stm-ehci.?/usb?/?-?/?-?.?/?-?.?:?.?/host*) # hub
      PORT=${P#*.*.*.}   # strip off /devices/platform/stm-usb.?/stm-ehci.?/usb?/?-?/?-?
      PORT=${PORT%%/*}   # strip off /?-?.?:?.?/host*, leaving the port
      BUS="usb-${P:37:1}-hub-${PORT}"
      ;;
   /devices/platform/stm-usb.?/stm-ehci.?/usb?/?-?/?-?:?.?/host*) # no hub
      #############################^37
      BUS="usb-${P:37:1}"
      ;;
   *)
      # BUS="unknown" # ignored for now
      ;;
   esac
   if [ -n "$BUS" ]; then
      LINK="${BUS}${PARTNUM:+-}${PARTNUM}"
      rm -f "${LINK}"
      ln -s $MDEV "${LINK}"
   fi

   cd $OLDPWD
}

remove_symlinks() {
   OLDPWD=$PWD
   cd $MOUNTBASE
   for i in *; do
      [ -L "$i" ] || continue
      TARGET=$(readlink "$i")
      if [ "$TARGET" = "$MDEV" ]; then
         rm "$i"
      fi
   done
   cd $OLDPWD
}

case "$ACTION" in
   add|"")
      if [ ${#MDEV} = 3 ]; then # sda, sdb, sdc => whole drive
         PARTS=$(sed -n "/ ${MDEV}[0-9]$/{s/ *[0-9]* *[0-9]* * [0-9]* //;p}" /proc/partitions)
         if [ -n "$PARTS" ]; then
            $LOG "drive has partitions $PARTS, not trying to mount $MDEV"
            exit 0
         fi
      fi
      if grep -q "/dev/$MDEV " /proc/mounts; then
         $LOG "/dev/$MDEV already mounted - not mounting again"
         exit 0
      fi
      $LOG "mounting /dev/$MDEV to $MOUNTPOINT"
      NTFSMOUNT=$(which ntfs-3g)
      RET2=$?
      # remove old mountpoint symlinks we might have for this device
      rm -f $MOUNTPOINT
      mkdir -p $MOUNTPOINT
      for i in 1 2 3 4 5; do # retry, my freeagent drive sometimes needs more time
         # $LOG "mounting /dev/$MDEV to $MOUNTPOINT try $i"
         OUT1=$(mount -t auto /dev/$MDEV $MOUNTPOINT 2>&1 >/dev/null)
         RET1=$?
         [ $RET1 = 0 ] && break
         sleep 1
      done
      if [ $RET1 != 0 -a -n "$NTFSMOUNT" ]; then
         # failed,retry with ntfs-3g
         for i in 1 2; do # retry only twice, waited already 5 seconds
            $NTFSMOUNT /dev/$MDEV $MOUNTPOINT
            RET2=$?
            [ $RET2 = 0 ] && break
            sleep 1
         done
      fi
      if [ $RET1 = 0 -o $RET2 = 0 ]; then
         create_symlinks
      else
         $WARN "mount   /dev/$MDEV $MOUNTPOINT failed with $RET1"
         $WARN "        $OUT1"
         if [ -n "$NTFSMOUNT" ]; then
            $WARN "ntfs-3g /dev/$MDEV $MOUNTPOINT failed with $RET2"
         fi
         rmdir $MOUNTPOINT
      fi
      ;;
   remove)
      $LOG "unmounting /dev/$MDEV"
      grep -q "^/dev/$MDEV " /proc/mounts || exit 0 # not mounted...
      umount -lf /dev/$MDEV
      RET=$?
      if [ $RET = 0 ]; then
         rmdir $MOUNTPOINT
         remove_symlinks
      else
         $WARN "umount /dev/$MDEV failed with $RET"
      fi
      ;;
esac

/dev/sda1 /media/sda1 vfat rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=utf8,shortname=mixed,errors=remount-ro 0 0

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