how to determine if dvd is mounted

[scruffy72]

I wrote a bash script to copy files from the hard-drive to a dvd and then verify the burning by comparing all burned files with the original.

My problem is that I am having trouble remounting the dvd when the burn is complete. The code as I have it works 90% of the time but sometimes the mount call fails because the device is "already mounted or device is busy" or some thing like that.

Automounting is turned off for optical media and I would prefer to keep it that way, so an excerpt from my script looks like this (starting after burning is complete):

# open and close the drive
eject 
eject -T
sleep 20
mount /mnt/dvd
# another script verifies...
verifymedia /mnt/dvd $1

My question is, does anyone know of a better way to ensure the drive is mounted before proceeding? Mine is not only ugly but it doesn't always work.

Thanks in advance for any suggestions.

[ppesci]

Not a bahs expert but the expression:

grep -c /mount/point/of/dvd /etc/mtab

must return 1 if mounted and 0 if not

HTH

[scruffy72]

Thanks and yes, actually I had this:

while ! grep -q /mnt/dvd /etc/mtab ; do
  sleep 5
  mount /mnt/dvd
done

but as it turns out I have another mountpoint at /mnt/dvdiso so the while expression was always true and the block never ran. At this point I just modified it to "/mnt/dvd " with a space at the end but that seems sort of wrong to have to do that.

Ideally, I'd like to pause while whatever it is that runs when you close the dvd drawer (maybe udev? I have no idea) finishes so that the mount command never fails.

[ppesci]

May be you must change the line:

while ! grep -q ^/mnt/dvd$ /etc/mtab ; do

I think this is an exact match.

HTH