On Mar 30, 2020, at 5:29 PM, dcpomatic-request@carlh.net wrote:

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Today's Topics:

  1. Re: DCP-o-matic Disk Writer alpha test (Carl Hetherington)
  2. Re: DCP-o-matic Disk Writer alpha test
     (cjflynn@digitaltesttools.com)


----------------------------------------------------------------------

Message: 1
Date: Tue, 31 Mar 2020 01:14:09 +0100 (BST)
From: Carl Hetherington <cth@carlh.net>
To: "audiovisual@t-online.de" <audiovisual@t-online.de>
Cc: "dcpomatic@carlh.net" <dcpomatic@carlh.net>
Subject: Re: [DCP-o-matic] DCP-o-matic Disk Writer alpha test
Message-ID: <alpine.DEB.2.21.2003310105070.1218@main.carlh.net>
Content-Type: text/plain; charset="utf-8"

Hi all,

Can you tell us how this works/what it is doing in detail?

There is some platform-specific code to find available drives and open
them as devices that DCP-o-matic can write raw data to.  Then there is a
library called lwext4 (https://github.com/gkostka/lwext4) (that I have
tweaked a little) which can make an ext2 filesystem given a place to write
the raw data.

So the DCP-o-matic Disk Writer just asks for a DCP and a drive, then
formats the drive as ext2 with the required inode size, copies the data
and verifies it.

It seems to work on Windows and Linux and I am just working on the Mac
version.

The two main concerns I have are:

1. does it destroy users' data?
2. does it *always* either a) make a valid DCP drive or b) give an error.

If we are confident that (1) happens rarely and (2) happens mostly then we
will probably have a useful tool.  TBH one of the main motivations here is
to remove a source of error that can be blamed on DCP-o-matic, and to
simplify the explanation of the DCP-making process to truly be "put your
file in, click the button, get a drive out".

All the best,
Carl

- Carsten


-----Original-Nachricht-----
Betreff: [DCP-o-matic] DCP-o-matic Disk Writer alpha test
Datum: 2020-03-30T00:35:45+0200
Von: "Carl Hetherington via DCPomatic" <dcpomatic@carlh.net>
An: "dcpomatic@carlh.net" <dcpomatic@carlh.net>

Hi all,

I'm hopefully not-too-far (TM) away from having a very alpha-quality
version of a "disk writer" tool for DCP-o-matic.  This is a thing which
can format a drive as EXT2 and copy a DCP onto it from
Linux/macOS/Windows.

Since the potential for disaster is fairly high with this tool (i.e.
unrecoverably destroyed hard disk partitions) I am hoping to find some
brave and interested parties to test it out in a sort of "closed beta"
arrangement, rather than making it available to everybody in the normal
test version.

If you are interested in helping out with testing, drop me a line!  All
that's really required is an understanding that the software might destroy
any data that happens to be on any drive connected to the computer that
you run it on.  So if you have an old machine that you could tolerate
re-installing, that would be ideal!  It doesn't need any great CPU power.

If you have access to a cinema to test your copied drives, even better!

I hope everybody is keeping as well as can be expected given the current
state of the world.

Kind regards,
Carl


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------------------------------

Message: 2
Date: Mon, 30 Mar 2020 17:28:56 -0700
From: "cjflynn@digitaltesttools.com" <cjflynn@digitaltesttools.com>
To: Carl Hetherington <cth@carlh.net>
Cc: "audiovisual@t-online.de" <audiovisual@t-online.de>,
"dcpomatic@carlh.net" <dcpomatic@carlh.net>
Subject: Re: [DCP-o-matic] DCP-o-matic Disk Writer alpha test
Message-ID:
<75956F52-8767-4467-946C-252982593D1E@digitaltesttools.com>
Content-Type: text/plain; charset="utf-8"

My spare Mac situation might be great for this since it is booting off an external USB. So, if the program will confuse and wipe out anything, it will be a good target. I?ll make certain to make an image of it for when you are ready for testing!

Best in return,
C J

On Mar 30, 2020, at 5:14 PM, Carl Hetherington via DCPomatic <dcpomatic@carlh.net> wrote:

Hi all,

Can you tell us how this works/what it is doing in detail?

There is some platform-specific code to find available drives and open
them as devices that DCP-o-matic can write raw data to.  Then there is a
library called lwext4 (https://github.com/gkostka/lwext4 <https://github.com/gkostka/lwext4>) (that I have
tweaked a little) which can make an ext2 filesystem given a place to write
the raw data.

So the DCP-o-matic Disk Writer just asks for a DCP and a drive, then
formats the drive as ext2 with the required inode size, copies the data
and verifies it.

It seems to work on Windows and Linux and I am just working on the Mac
version.

The two main concerns I have are:

1. does it destroy users' data?
2. does it *always* either a) make a valid DCP drive or b) give an error.

If we are confident that (1) happens rarely and (2) happens mostly then we
will probably have a useful tool.  TBH one of the main motivations here is
to remove a source of error that can be blamed on DCP-o-matic, and to
simplify the explanation of the DCP-making process to truly be "put your
file in, click the button, get a drive out".

All the best,
Carl

- Carsten


-----Original-Nachricht-----
Betreff: [DCP-o-matic] DCP-o-matic Disk Writer alpha test
Datum: 2020-03-30T00:35:45+0200
Von: "Carl Hetherington via DCPomatic" <dcpomatic@carlh.net>
An: "dcpomatic@carlh.net" <dcpomatic@carlh.net>

Hi all,

I'm hopefully not-too-far (TM) away from having a very alpha-quality
version of a "disk writer" tool for DCP-o-matic.  This is a thing which
can format a drive as EXT2 and copy a DCP onto it from
Linux/macOS/Windows.

Since the potential for disaster is fairly high with this tool (i.e.
unrecoverably destroyed hard disk partitions) I am hoping to find some
brave and interested parties to test it out in a sort of "closed beta"
arrangement, rather than making it available to everybody in the normal
test version.

If you are interested in helping out with testing, drop me a line!  All
that's really required is an understanding that the software might destroy
any data that happens to be on any drive connected to the computer that
you run it on.  So if you have an old machine that you could tolerate
re-installing, that would be ideal!  It doesn't need any great CPU power.

If you have access to a cinema to test your copied drives, even better!

I hope everybody is keeping as well as can be expected given the current
state of the world.

Kind regards,
Carl


_______________________________________________
DCPomatic mailing list
DCPomatic@carlh.net
http://main.carlh.net/cgi-bin/mailman/listinfo/dcpomatic
?

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http://main.carlh.net/cgi-bin/mailman/listinfo/dcpomatic

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