SH wrote:
>
>
> Just a small question:
>
> Is it possible to mount a disk-device (/dev/cdrom) to a file instead of a
> path?

Why?

> now: "/dev/cdrom" -> "/media/cdrom"
> i want: "/dev/cdrom" -> "/media/cdrom.iso" or similar

With Linux there is not so much difference between a file and a path.
The standard name is indeed /media/cdrom, but you can name it obviously
anything you desire.

But again, why? I have learned that the easiest way in the long run is
to just accept how things are. They are thought of by people who have
more experience then I have.

The moment I am able to change things without asking, I, most of the
time know why those people did it the way they did it. Sometimes I still
change it and then learn it the hard way and very seldom I think I am
right.

What I do then is file a bigreport, so the standard way of doing it is
changed.

So before I tell how, I would love to see why. Probably you have an
issue that can be solved in an other matter.

houghi
--



This space left blank intentionaly

"SH" writes:

>Just a small question:

>Is it possible to mount a disk-device (/dev/cdrom) to a file instead of a
>path?

>now: "/dev/cdrom" -> "/media/cdrom"
>i want: "/dev/cdrom" -> "/media/cdrom.iso" or similar

Why?

On November 4, 2008 16:20, in alt.os.linux.suse, SH
(trash_mail_account@web.de) wrote:

> Just a small question:
>
> Is it possible to mount a disk-device (/dev/cdrom) to a file instead of a
> path?

No, and yes.

No, you cannot /mount/ a block special file such as /dev/cdrom to a file.
Devices such as /dev/cdrom are data sources, not mountpoints.

Yes, you can /access/ a block special file as a file. Devices such
as /dev/cdrom can be read and written directly, without being mounted.
For example,
dd if=/dev/cdrom of=/tmp/contents_of_cdrom.iso bs=1024
will perform a bit-for-bit copy of the contents of the CDROM currently
sitting (not mounted) in the /dev/cdrom device to a flat file called
contents_of_cdrom.iso

Yes, you can /mount/ a flat file in place of a block special file. Files
such as cdrom.iso can be mounted as if they were devices.
For example
mount -t iso9660 -o loop /tmp/contents_of_cdrom.iso /media/cdrom
will mount the file contents_of_cdrom.iso onto the mountpoint /media/cdrom

> now: "/dev/cdrom" -> "/media/cdrom"
> i want: "/dev/cdrom" -> "/media/cdrom.iso" or similar

See my point about mounting a flat file, above

--
Lew Pitcher

Master Codewright & JOAT-in-training | Registered Linux User #112576
http://pitcher.digitalfreehold.ca/ | GPG public key available by request
---------- Slackware - Because I know what I'm doing. ------

Well, I don't want to mount an iso to a mountpoint.

Scenario:

- Video-DVD in /dev/cdrom
- Samba-Share on Mountpoint for Windows-HTPC does not work because of CSS
protection
- dvdreadfs with fuse to Samba-Share works, but is too slow and sometimes
stops while playing the movie on tv
- Samba-Share of the iso-File of the DVD and mount it for example with
"Alcohol 120%" on the Windows-machine _could_ work
- for that, i need the iso/image to be read "on the fly"
- LAN is 100mbit, so should be fast enough



S.H.

SH wrote:
> Well, I don't want to mount an iso to a mountpoint.
>
> Scenario:
>
> - Video-DVD in /dev/cdrom
> - Samba-Share on Mountpoint for Windows-HTPC does not work because of CSS
> protection
> - dvdreadfs with fuse to Samba-Share works, but is too slow and sometimes
> stops while playing the movie on tv
> - Samba-Share of the iso-File of the DVD and mount it for example with
> "Alcohol 120%" on the Windows-machine _could_ work
> - for that, i need the iso/image to be read "on the fly"
> - LAN is 100mbit, so should be fast enough

I would consider using VLC to stream the movie to the Windows box instead.

SH schrieb:

> Well, I don't want to mount an iso to a mountpoint.
>
> Scenario:
>
> - Video-DVD in /dev/cdrom
> - Samba-Share on Mountpoint for Windows-HTPC does not work because of CSS
> protection
>
CSS is working on the drive, not with the PC. The sectors are scrambled
until the player has identified itself against the drive. Try yourself.
Mount a DVD-Video and try to read a file simply by "cat". It will fail.
Check dmesg to get some more insight.

Now try a dvd playing application like mplayer (with internal libdvdcss).
Stop mplayer, do not umount the drive. Now you cat use "cat" on the files
on the disc or on the raw device, too.

Mounting the files will not help regardless of that. DVD menu structures use
disc-relative sector numbers, not file-relative. So the player application
needs a disc image in any case.


Just rip the entire image with

# cat /dev/cdrom >my_dvd.iso

You can safely do this even if the device is mounted, as it is read-only.
And remember: Before, you have to play at least some seconds of the disc
with mplayer to get rid of stupid CSS.

Kind regards

Jan

That sounds like... A lot of manual work to do, before i can watch a
movie...
The problem is, the Linux-Machine has no screen. I have no possibility to
"watch a few seconds".
Additionally, that should work automated: Insert disk in Linux-Server, watch
the movie on the HTPC (that has no optical drive, because it's so small).

SH wrote:
> That sounds like... A lot of manual work to do, before i can watch a
> movie...


Could you please start to quote what you are replying to? Makes it
easier to help.

houghi
--



This space left blank intentionaly

SH schrieb:

> That sounds like... A lot of manual work to do, before i can watch a
> movie...
> The problem is, the Linux-Machine has no screen. I have no possibility to
> "watch a few seconds".
>
Huh?

mplayer -vo null -ao null -frames 10 dvd://

will do the trick.


> Additionally, that should work automated: Insert disk in Linux-Server,
> watch the movie on the HTPC (that has no optical drive, because it's so
> small).
>
Write an udev rule that checks if the inserted disk is a DVD-Video and
starts a script with the above mplayer line and a

dd if=/dev/cdrom of=/tmp/dvd.iso bs=1M

afterwards. Dumping the dvd should go in about 10..20 minutes depending on
your dvd drive. After that, the iso is ready to play.

Kind regards

Jan

On Tue, 04 Nov 2008 22:20:35 +0100, SH typed this message:

> Just a small question:
>
> Is it possible to mount a disk-device (/dev/cdrom) to a file instead of
> a path?
>
> now: "/dev/cdrom" -> "/media/cdrom"
> i want: "/dev/cdrom" -> "/media/cdrom.iso" or similar
>
> Thank you.
>
> S.H.

IIUC from your replies you want to have the /dev/cdrom mounted as a file
or something that can accessed remotely to watch videos?

ISOs are easy sudo mount -o loop -t iso9660 /dev/cdrom /folder

As would be using ln -s /dev/cdrom /folder

The problem is accessing the /folder, not sure if NFS would see the
linked /folder, but Samba clients would definitely see Samba Server
shared folders. Then there's name changes that mplayer would need to
use, ie, /dev/cdrom/"this movie"


I think if your non-optical device remote PC is the NFS Server then share
a folder to the optical device enabled local PC. Then mount the optical
device as a folder on the NFS Server share.

nfs client:-> ln -s /dev/cdrom /nfsserver/nfs/folder

nfs server:-> mplayer dvd://nfs/folder

Sorry, I can't be more specific but I haven't had to do anything like
that in quite a few years.

Thank you for your help, but it's a Windows machine.
Seems, as if there's no real solution für my problem.

S.H.

> 10..20 minutes

Haha. ;-)


S.H.

> Could you please start to quote what you are replying to? Makes it
> easier to help.


Can't you see the post I replied to? Sorry. In Outlook Express (uarghs) it
would be obvious. :-P


S.H.

SH wrote:
> Can't you see the post I replied to? Sorry. In Outlook Express (uarghs) it
> would be obvious. :-P

With Linux not everybody reads news in the same way. Not everybody uses
the same program. For that reason the best way is not to asume how
people read news, but instead follow the standard rules of inline
quoting. That also shows you take sme effort and that in itself is an
incentive to help (at least for me)

And yes, I could see the message you replied to, but why must *I* do the
effort and what if that previous message never arrived?

There are reasons for correct quoting.

houghi
--
Come to think of it, there are already a million monkeys on a million
typewriters, and Usenet is NOTHING like Shakespeare.
-- Blair Houghton

"SH" writes:

>Thank you for your help, but it's a Windows machine.
>Seems, as if there's no real solution für my problem.

??? Windows has no /dev/cdrom.

And why are you asking in alt.os.linux.suse about a Windows machine?

On Wednesday, November 5th, 2008 at 21:53:30h +0100, SH despaired:
> Thank you for your help, but it's a Windows machine.
> Seems, as if there's no real solution für my problem.

Maybe I missing something in the details, but how about
SAMBA share the /dev/dvd device and on the Windoze machine
point the DVD player to the network device?

SH wrote:
> Thank you for your help, but it's a Windows machine.
> Seems, as if there's no real solution für my problem.

You didn't even reply to my post saying that I recommend VLC to stream
the video.

> Maybe I missing something in the details, but how about
> SAMBA share the /dev/dvd device and on the Windoze machine
> point the DVD player to the network device?

Because CSS will block that.

S.H.

> You didn't even reply to my post saying that I recommend VLC to stream
> the video.

That's no overall solution. Sorry. I just wanted to ask, if there's a
"simple" and automated way to get the CD/DVD-Images to my Windows-Machine.
But it seems hat buying a USB-CD/DVD-Device would be the easier way. Sad.

S.H.