Re: [PLUG] HELP! PLUG needs more JOBS mailing list moderators

[wes]

I volunteer.

-wes

On Mon, Jan 29, 2018 at 10:37 PM, Michael Dexter 
wrote:

>
> Hello,
>
> The spammers are attacking and it would be great if a few more people
> would be willing to moderate the list. This is done through a web interface.
>
> Interested?
>
> Thanks!
>
> Michael Dexter
> PLUG Volunteer
>
> (Yes, there is a 1st Thursday speaker lined up. Working on the
> announcement)
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Re: [PLUG] SCSI device driver

[John Jason Jordan]

On Mon, 29 Jan 2018 19:55:45 -0800
King Beowulf  dijo:

>On 01/29/2018 02:22 AM, Tomas Kuchta wrote:
>> Pretty old distro/kernel. For what is worth it - I do not have the
>> same problem with 16.04.
>> 
>> Anyway, how about creating soft link pointing to /dev/sr?. Did you
>> try that?

>IIRC, /dev/sg* are character devices, /dev/sr* are block devices, and
>you can't just link them together with 'ln'
>
>lsscsi -g  should list the connection of block to scsi char device if
>the sg module is loaded correctly and udev creates the dev nodes
>
>I did read somewhere that ubuntu dropped sg as "unused".  Since others
>here have said that newer Ubuntu kernels have sg and it works.  Perhaps
>an upgrade is the best fix.

For now I have shelved the idea of a symlink.

Here is what I get from lsscsi -g:
$ lsscsi -g
[2:0:0:0]cd/dvd  hp  BD MLT UJ260AF FW06  /dev/sr0/dev/sg0 
[4:0:0:0]disk   ATA Crucial_CT480M50 MU03  /dev/sda   /dev/sg1 
[6:0:0:0]disk   H/W RAID 0   0106  /dev/sdb   /dev/sg3 
[7:0:0:0]cd/dvd HL-DT-ST DVDRAM GU90N 1.00  /dev/sr1   /dev/sg2 
[8:0:0:0]disk  PNY  USB 3.0 FD  1.00  /dev/sdc   /dev/sg4
[9:0:0:0]disk  LG   USB Drive 1100  /dev/sdd   /dev/sg5 

Tomas mentioned previously that he had no problem with MakeMKV on
Ubuntu 16.04. I assume he meant the latest version 1.10.10, because I
can still run 1.10.8 on Ubuntu 14.04. The only reason I need the latest
version is because it has recently released aacs keys. Not only does
this affect only a few very recently released Blu-rays, but there is a
workaround. I can use dd (although I prefer ddrescue) to make an .iso
of the disk, and MakeMKV 1.10.10 can use that, thus not needing access
to the optical drive at all. It's a clunky workaround, but it works.

I should mention in passing that, while not open source, the Linux
version of MakeMKV is free, although you get some extras if you pay for
it. And dumphd is a FOSS program with similar functionality, although I
could never get it to work. If anyone wishes to play around with these
things you can do so with no cost except your time. Oh, that is,
assuming you have a Blu-ray drive for your computer.

As I write this there are 68 comments in the thread about this on the
MakeMKV Linux forum, including several by the admin asking for input
from users. The problem is being worked on, so I'm going to sit back
and wait. 
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Re: [PLUG] SCSI device driver

[King Beowulf]

On 01/29/2018 02:22 AM, Tomas Kuchta wrote:
> Pretty old distro/kernel. For what is worth it - I do not have the same
> problem with 16.04.
> 
> Anyway, how about creating soft link pointing to /dev/sr?. Did you try that?
> 
> Tomas
> 

IIRC, /dev/sg* are character devices, /dev/sr* are block devices, and
you can't just link them together with 'ln'

lsscsi -g  should list the connection of block to scsi char device if
the sg module is loaded correctly and udev creates the dev nodes

I did read somewhere that ubuntu dropped sg as "unused".  Since others
here have said that newer Ubuntu kernels have sg and it works.  Perhaps
an upgrade is the best fix.

-Ed



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Re: [PLUG] SCSI device driver

[Tim Bruce - PLUG]

JJJ -

/dev is usually a protected directory.

You should probably be doing:

   sudo ln -s /dev/sg0 /dev/sr0

Tim
-- 
Timothy J. Bruce

visit my Website at: http://www.tbruce.com
Registered Linux User #325725

On Mon, January 29, 2018 15:31, Rich Shepard wrote:
> On Mon, 29 Jan 2018, John Jason Jordan wrote:
>
>> ln -s /dev/sr0/ /dev/sg0/
>> ln: failed to access ‘/dev/sg0/’: Not a directory
>
>Oops. My mistake.
>
>> ln -s /dev/sr0 /dev/sg0
>> ln: failed to create symbolic link ‘/dev/sg0’: File exists
>
>When you do a long list of devices,
>   ls -l /dev/s*
> do you see sg0? Is it displayed as a file, a link, or something else? The
> color should provide the answer.
>
>For example, from this host:
>
> $ ll /dev/s*
> brw-rw 1 root disk   8,   0 Jan 19 12:26 /dev/sda
> brw-rw 1 root disk   8,   1 Jan 19 12:26 /dev/sda1
> brw-rw 1 root disk   8,   2 Jan 19 12:26 /dev/sda2
> brw-rw 1 root disk   8,   3 Jan 19 12:26 /dev/sda3
> brw-rw 1 root disk   8,   4 Jan 19 12:26 /dev/sda4
> brw-rw 1 root disk   8,   5 Jan 19 12:26 /dev/sda5
> brw-rw 1 root disk   8,   6 Jan 19 12:26 /dev/sda6
> brw-rw 1 root disk   8,   7 Jan 19 12:26 /dev/sda7
> brw-rw 1 root disk   8,   8 Jan 19 12:26 /dev/sda8
> brw-rw 1 root disk   8,   9 Jan 19 12:26 /dev/sda9
> crw--- 1 root root  10, 231 Jan 19 12:26 /dev/snapshot
> brw-rw 1 root cdrom 11,   0 Jan 19 12:26 /dev/sr0
> lrwxrwxrwx 1 root root   15 Jan 19 04:26 /dev/stderr ->
> /proc/self/fd/2
> lrwxrwxrwx 1 root root   15 Jan 19 04:26 /dev/stdin -> /proc/self/fd/0
> lrwxrwxrwx 1 root root   15 Jan 19 04:26 /dev/stdout ->
> /proc/self/fd/1
>
>You can see the difference between actual files and links (on the
> bottom
> 3).
>
> Rich
>
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Re: [PLUG] SCSI device driver

[John Jason Jordan]

On Mon, 29 Jan 2018 14:18:07 -0800 (PST)
Rich Shepard  dijo:

>On Mon, 29 Jan 2018, John Jason Jordan wrote:
>
>> A slight problem:
>>
>> $ ln -s /dev/sg0 /dev/sr0
>> ln: failed to create symbolic link ‘/dev/sr0’: File exists
>>
>> What am I doing wrong?

>   You have them backwards. Try:
>
>   ln -s /dev/sr0/ /dev/sg0/
>
>   sr0 is the target and sg0 is the link name. 'man ln' has details.

OK, still doesn't work:

 ln -s /dev/sr0/ /dev/sg0/
ln: failed to access ‘/dev/sg0/’: Not a directory

ln -s /dev/sr0 /dev/sg0
ln: failed to create symbolic link ‘/dev/sg0’: File exists

I read the man page for ln and maybe I need to give the command the
name of a file that it will create? Still confused.
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Re: [PLUG] SCSI device driver

[John Jason Jordan]

On Mon, 29 Jan 2018 13:10:41 -0800
Tomas Kuchta  dijo:

>Yes, this would create soft link to /dev/sr1 and satisfy your
>application. And so on...

>I assume the syntax should be ln -s /dev/sg0 /dev/sr0, and
>ln -s /dev/sg2 /dev/sr1, right? Or do I have that backwards?

A slight problem:

$ ln -s /dev/sg0 /dev/sr0
ln: failed to create symbolic link ‘/dev/sr0’: File exists

What am I doing wrong?
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Re: [PLUG] SCSI device driver

[Tomas Kuchta]

Yes, this would create soft link to /dev/sr1 and satisfy your application.
And so on...

These links might disappear at some point, but that would be easy to solve,
if it works for you.

Tomas

On Jan 29, 2018 8:49 AM, "John Jason Jordan"  wrote:

On Mon, 29 Jan 2018 02:22:22 -0800
Tomas Kuchta  dijo:

>Pretty old distro/kernel. For what is worth it - I do not have the same
>problem with 16.04.
>
>Anyway, how about creating soft link pointing to /dev/sr?. Did you try
>that?

No, I did not. try creating a soft link. I assume it would need to
point /dev/sg* to /dev/sr0 and /dev/sr1 (my optical drives).

ls -la /dev/sg*
crw-rw+ 1 root cdrom 21, 0 Jan 23 16:33 /dev/sg0
crw-rw  1 root disk  21, 1 Jan 23 16:33 /dev/sg1
crw-rw+ 1 root cdrom 21, 2 Jan 23 16:33 /dev/sg2
crw-rw  1 root disk  21, 3 Jan 23 16:33 /dev/sg3
crw-rw  1 root disk  21, 4 Jan 23 16:34 /dev/sg4
crw-rw  1 root disk  21, 5 Jan 26 23:00 /dev/sg5

I note that the /dev folder has sx zero byte files for sg0 - 5, plus
zero byte sr0 and sr1.
I assume the syntax should be ln -s /dev/sg0 /dev/sr0, and
ln -s /dev/sg2 /dev/sr1, right? Or do I have that backwards?
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Re: [PLUG] SCSI device driver

[John Jason Jordan]

On Mon, 29 Jan 2018 02:22:22 -0800
Tomas Kuchta  dijo:

>Pretty old distro/kernel. For what is worth it - I do not have the same
>problem with 16.04.
>
>Anyway, how about creating soft link pointing to /dev/sr?. Did you try
>that?

No, I did not. try creating a soft link. I assume it would need to
point /dev/sg* to /dev/sr0 and /dev/sr1 (my optical drives).

ls -la /dev/sg*
crw-rw+ 1 root cdrom 21, 0 Jan 23 16:33 /dev/sg0
crw-rw  1 root disk  21, 1 Jan 23 16:33 /dev/sg1
crw-rw+ 1 root cdrom 21, 2 Jan 23 16:33 /dev/sg2
crw-rw  1 root disk  21, 3 Jan 23 16:33 /dev/sg3
crw-rw  1 root disk  21, 4 Jan 23 16:34 /dev/sg4
crw-rw  1 root disk  21, 5 Jan 26 23:00 /dev/sg5

I note that the /dev folder has sx zero byte files for sg0 - 5, plus
zero byte sr0 and sr1.
I assume the syntax should be ln -s /dev/sg0 /dev/sr0, and 
ln -s /dev/sg2 /dev/sr1, right? Or do I have that backwards?
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Re: [PLUG] SCSI device driver

[Tomas Kuchta]

Pretty old distro/kernel. For what is worth it - I do not have the same
problem with 16.04.

Anyway, how about creating soft link pointing to /dev/sr?. Did you try that?

Tomas

On Jan 27, 2018 9:39 AM, "John Jason Jordan"  wrote:

> Xubuntu 14.04.5, all updates applied.
>
> I have a program that can't find ether of my optical drives, /dev/sr0
> and /dev/sr1. Apparently there is a new module, 'sg,' that calls
> them /dev/sg0 and /dev/sg1, and those are all that the program will
> look for. I can't tell if I have the module installed or not:
>
> sudo modprobe sg - returns nothing, no error messages
> lsmod | grep sg - also returns nothing
> ls -la /dev/sg* returns:
> crw-rw+ 1 root cdrom 21, 0 Jan 23 16:33 /dev/sg0
> crw-rw  1 root disk  21, 1 Jan 23 16:33 /dev/sg1
> crw-rw+ 1 root cdrom 21, 2 Jan 23 16:33 /dev/sg2
> crw-rw  1 root disk  21, 3 Jan 23 16:33 /dev/sg3
> crw-rw  1 root disk  21, 4 Jan 23 16:34 /dev/sg4
> crw-rw  1 root disk  21, 5 Jan 26 23:00 /dev/sg5
> ls -la /dev/sr* returns:
> brw-rw+ 1 root cdrom 11, 0 Jan 25 17:46 /dev/sr0
> brw-rw+ 1 root cdrom 11, 1 Jan 23 16:33 /dev/sr1
>
> Synaptic lists no module 'sg,' although it does list 'sg3_utils and
> 'sscsitools-gui,' which I installed. I can't figure out how to use
> either one, no man pages and no way to launch the GUI.
>
> According to http://sg.danny.cz/sg/#mozTocId689512 the latest version
> of sg is 3.0.19.
>
> If it matters, uname -a gives:
> Linux Devil-Bonobo 3.13.0-139-generic #188-Ubuntu SMP Tue Jan 9
> 14:43:09 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
>
> I can't tell is the module is installed or not. Evidence is confusing:
> 1) the program still can't find the devices
> 2) lsmod doesn't find it
> 3) modprobe returns no error messages
> 4) ls -la /dev/sg* shows the devices
>
> I could use some suggestions.
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