I think you might be able to accomplish what you want using network block devices (NBD). Looking at the wikipedia page on the subject there is mention of a tool called
nbd. It's comprised of a client and server component.
In this scenario I'm setting up a CDROM on my Fedora 19 laptop (server) and I'm sharing it out to an Ubuntu 12.10 system (client).
sharing a CD
$ apt-cache search ^nbd-
nbd-client - Network Block Device protocol - client
nbd-server - Network Block Device protocol - server
$ sudo apt-get install nbd-server nbd-client
Now back on the server (Fedodra 19) I do a similar thing using its package manager YUM. Once complete I pop a CD in and run this command to share it out as a block device:
$ sudo nbd-server 2000 /dev/sr0
** (process:29516): WARNING **: Specifying an export on the command line is deprecated.
** (process:29516): WARNING **: Please use a configuration file instead.
A quick check to see if it's running:
Mounting the CD
$ ps -eaf | grep nbd
root 29517 1 0 12:02 ? 00:00:00 nbd-server 2000 /dev/sr0
root 29519 29071 0 12:02 pts/6 00:00:00 grep --color=auto nbd
Now back on the Ubuntu client we need to connect to the
nbd-client like so. NOTE: the name of the nbd-server is greeneggs in this example.
$ sudo nbd-client greeneggs 2000 /dev/nbd0
Negotiation: ..size = 643MB
bs=1024, sz=674983936 bytes
(On some systems - e.g. Fedora - one has to
modprobe nbd first.)
We can confirm that there's now a block device on the Ubuntu system using
$ sudo lsblk -l
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
sda1 8:1 0 243M 0 part /boot
sda2 8:2 0 1K 0 part
sda5 8:5 0 465.5G 0 part
ubuntu-root (dm-0) 252:0 0 461.7G 0 lvm /
ubuntu-swap_1 (dm-1) 252:1 0 3.8G 0 lvm [SWAP]
sr0 11:0 1 654.8M 0 rom
nbd0 43:0 0 643M 1 disk
nbd0p1 43:1 0 643M 1 part
And now we mount it:
did it work?
$ sudo mount /dev/nbd0p1 /mnt/
mount: block device /dev/nbd0p1 is write-protected, mounting read-only
The suspense is killing me, and we have liftoff:
$ sudo ls /mnt/
EFI GPL isolinux LiveOS
There's the contents of a LiveCD of CentOS that I mounted in the Fedora 19 laptop and was able to mount it as a block device of the network on Ubuntu.