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List:       busybox
Subject:    Re: Mounting an USB flask stick by-label
From:       Alexander Griesser <alexander.griesser () lkh-vil ! or ! at>
Date:       2009-02-16 12:26:23
Message-ID: 49995B6F.3070607 () lkh-vil ! or ! at
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Pedro Aguilar wrote:
> Hi,
> 
> I have an embbeded device with an initramfs with busybox inside it. We
> want to use this initramfs basically for updating the real filesystem that
> resides in an USB flash stick.
> 
> There could be several USB flash sticks connected to the target and we
> need to mount the one with our filesystem.
> We could differentiate our USB stick from the others by its label (mount
> -L), so I would like to know if there is a way with mdev to recognize an
> USB stick by-label or any other way (the serial id is not useful because
> each target has a different USB stick).

I'm using code like this for this purpose:

i=0
while [ "$i" != "10" ]; do
  LXTC_BOOT=$(blkid | awk -F: '/LABEL="LXTC_BOOT"/ { print $1 }')
  if [ "$LXTC_BOOT" = "" ]; then
    sleep 1
    i=$((i + 1))
    echo -n "."
    continue
  else
    echo "found ($LXTC_BOOT)".
    break
  fi
done

The label of my filesystem is "LXTC_BOOT", so by simply replacing this
label you will have the name of the blockdevice in the variable
"LXTC_BOOT" then.

The reason why I'm running through a 10 second time loop here is because
USB devices take some time to settle down and if the filesystem you're
looking for is on a USB drive (CD, stick, floppy, ...) the first
invocation will probably not find it immediately.

ciao,
- --
Alexander Griesser (Netzwerkadministration)
E-Mail: alexander.griesser@lkh-vil.or.at | Web: http://www.lkh-vil.or.at
KABEG LKH Villach | Nikolaigasse 43 | 9500 Villach
Tel.:   +43 4242 208 3061 | Fax.:   +43 4242 208 971 2061
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