Dear list,
Another recent update in Debian / Ubuntu has broken PDF thumbnail
generation in DSpace 5 and 6, though this time it is the Ghostscript
package rather than ImageMagick. You should see errors like this when you
try to run filter-media:
org.im4java.core.InfoException: org.im4java.core.CommandException:
org.im4java.core.CommandException: identify: FailedToExecuteCommand `"gs"
-q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=5
-dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4
-dGraphicsAlphaBits=4 "-r72x72" -dFirstPage=1 -dLastPage=1
"-sOutputFile=/tmp/magick-12989PcFN0DnJOej7%d"
"-f/tmp/magick-129895Bmp44lvUfxo" "-f/tmp/magick-12989C0QFG51fktLF"' (-1) @
error/delegate.c/ExternalDelegateCommand/461.
See Ubuntu Security Notice 3831-1[0] as well as a StackOverflow discussion
from this past weekend[1]. In this case it seems that there is a bug[2] in
the upstream Ghostscript project related to the pngalpha device and there
is currently no packaged version with a fix. One workaround for now,
suggested in the StackOverflow discussion, is to use the png16m output
device instead of pngalpha. I have confirmed that this works on standalone
invocations of `gs`, but I am not sure what implications this has for
speed, memory, or the quality of thumbnails.
Regards,
[0] https://usn.ubuntu.com/3831-1/
[1]
https://stackoverflow.com/questions/53560755/ghostscript-9-26-update-breaks-imagick-readimage-for-multipage-pdf
[2] https://bugs.ghostscript.com/show_bug.cgi?id=699815
On Fri, Oct 12, 2018 at 6:44 PM Alan Orth wrote:
> Great idea, Tim! I just logged it in Jira as DS-4052.
>
> https://jira.duraspace.org/browse/DS-4052
>
> Regards,
>
> On Thu, Oct 11, 2018 at 7:23 PM Tim Donohue
> wrote:
>
>> Alan,
>>
>> Could you create a "documentation" ticket for this in our JIRA system (as
>> that's sometimes an easier place to find "known issues")? This sounds like
>> something we should get into the official documentation, and having a
>> ticket to remind us (and as a place to add additional questions/comments)
>> would be useful.
>>
>> Thanks,
>>
>> Tim
>>
>> On Thu, Oct 11, 2018 at 12:27 AM Alan Orth wrote:
>>
>>> Dear DSpace people,
>>>
>>> Recently I noticed that our PDFs were not getting thumbnails generated
>>> for them. I ran the filter-media script manually and saw an error like this:
>>>
>>> org.im4java.core.InfoException: org.im4java.core.CommandException:
>>> org.im4java.core.CommandException: identify: not authorized
>>> `/tmp/impdfthumb5039464037201498062.pdf' @ error/constitute.c/ReadImage/412.
>>>
>>> According to an Ubuntu Security Notice from 2018-10 the Ubuntu
>>> developers have decided to disable PDF processing by default in their
>>> ImageMagick[0] package. This affects all currently supported Ubuntu
>>> long-term support releases.
>>>
>>> If you are using DSpace 5.x or 6.x with ImageMagick thumbnail support,
>>> you will need to change your system's ImageMagick policy.xml file to
>>> re-enable PDF processing. On Ubuntu 16.04 the file is
>>> /etc/ImageMagick-6/policy.xml. Delete or comment out the following line:
>>>
>>>
>>>
>>> Regards,
>>>
>>> [0] https://usn.ubuntu.com/3785-1/
>>> --
>>> Alan Orth
>>> alan.o...@gmail.com
>>> https://picturingjordan.com
>>> https://englishbulgaria.net
>>> https://mjanja.ch
>>> "In heaven all the interesting people are missing." ―Friedrich Nietzsche
>>>
>>> --
>>> All messages to this mailing list should adhere to the DuraSpace Code of
>>> Conduct: https://duraspace.org/about/policies/code-of-conduct/
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "DSpace Technical Support" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to dspace-tech+unsubscr...@googlegroups.com.
>>> To post to this group, send email to dspace-tech@googlegroups.com.
>>> Visit this group at https://groups.google.com/group/dspace-tech.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>> --
>> Tim Donohue
>> Technical Lead for DSpace & DSpaceDirect
>> DuraSpace.org | DSpace.org | DSpaceDirect.org
>>
>
>
> --
> Alan Orth
> alan.o...@gmail.com
> https://picturingjordan.com
> https://englishbulgaria.net
> https://mjanja.ch
> "In heaven all the interesting people are missing." ―Friedrich Nietzsche
>
--
Alan Orth
alan.o...@gmail.com
https://picturingjordan.com
https://englishbulgaria.net
https://mjanja.ch
"In heaven all the interesting people are missing." ―Friedrich Nietzsche
--
All messages to this mailing list should adhere to the DuraSpace Code of
Conduct: https://duraspace.org/about/policies/code-of-conduct/
---
You received this message because you are subscribed to the Google Groups
"DSpace Technical Support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to dspace-tech+unsubscr...@googlegroups.com.
To post to this group, send email to dspace-tech@googlegroups.com.
Visit this group at https://groups.
