How To Detect a CD-ROM/DVD Driver Letter Under Cygwin

While automating a provisioning process I stumbled upon this issue... How do you know what drive letter is a CD-ROM?

The first try was:

grep -qw iso9660 /proc/mounts || return 1;

echo $(mount | awk '/iso9660/{print $3}')

which happens to work when a disk is inserted in the drive.

At my deliverables demo the disk was not present so bummer.

The second uses the Registry and works (in XP):

    cdrom='';

    for dr in D E F G H I J K L M N O P Q R S T U V W X Y Z

     do

      [ -e /proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/MountedDevices/%5CDosDevices%5C${dr}%3A ] || continue;

      tr -d '\00' < /proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/MountedDevices/%5CDosDevices%5C${dr}%3A | grep -qi cdrom || continue;

      cdrom="$dr";

     done

    [ -z "$cdrom" ] && return 1;

    echo /cygdrive/$(echo $cdrom | tr 'A-Z' 'a-z');

Brutal, eh?

Anyways

grep -qw iso9660 /proc/mounts || return 1;

is a great way to check whether a disk is in the unit (any unit).

-ulianov