Red Hat Bugzilla – Bug 496237
mimeinfo.cache lists applications for PDF files in an inappropriate order (gimp before evince)
Last modified: 2010-03-06 20:04:04 EST
Description of problem:
The symptom is that in firefox and thunderbird, when you ask to open a PDF file, it tries to use GIMP to open it rather than evince or okular or acroread. And there are various work-arounds, but in particular, using nautilus and the file properties box to say you want to open PDF files in evince for example doesn't change things in firefox and thunderbird.
The problem seems to be caused by the fact that /usr/share/applications/mimeinfo.cache contains this line
which puts GIMP ahead of all the normal PDF viewers. This problem appeared recently, and I suppose it might have been caused by a recent GIMP update, but I haven't had time to look into that.
If edit mimeinfo.cache and move gimp.desktop; to the end of that line, firefox and thunderbird automatically pick one of the other viewers for PDF files and all is well. But as soon as you install a package update that calls update-desktop-database, the fix is lost and you have to do it again.
I'm filing this here because there doesn't seem to be a nice mechanism within the .desktop architecture for specifying how the mimeinfo.cache file and programs that use it should prioritize all the applications that claim to handle PDF files.
Happens in rawhide too.
I see the problem in Fedora 9 as well.
Me too! I have just had this problem on RedHat 5.3.
I think "update-desktop-database" should be removed and/or RPM post install scripts should not be allowed to call update-desktop-database until these problems are cleared up. We desperately need documentation on update-desktop-database and we need some method to prioritize programs so that the ones we actually want are at the front of the list in /usr/share/applications/mimeinfo.cache.
I spent the day tracking down the problem in our computer lab. We updated kdegraphics and bam! all of the users went crazy when they tried to view pdf files. A program called kghostview, which doesn't appear to be able to display most of the pdf files we use, was being called. It is quite baffling because /usr/share/applications/defaults.list does have evince. It appears lots of programs ignore defaults.list, and they just read the mimeinfo.cache file. Even when configurations use xdg-open as the pdf viewer, readers were not getting evince.
Did you notice that update-desktop-database has been removed from the README file that is provided with the xdg file utils?
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Seeing this on Fedora 12 as well:
[stijn@pclin250] </usr/share/applications> grep xpdf mimeinfo.cache
The version of this bug needs to be updated to 12, or possibly rawhide.
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This is still the case on Fedora 12 as I submitted in comment #5
the lists in mimeinfo.cache are in random order. If it's choosing one from the list then that means we need a defaults.list update.
Right, now I feel silly. Thank you for reopening this but...
I know that at the time I double checked this (comment #5) it was the case that for me all PDF files opened using xpdf instead of evince. I also know that I did not ever select xpdf as the default PDF opener. I remember checking the configuration in ~/.local by hand to verify this. Hence why I provided the output I did.
After making comment #5 I used the nautilus interface to select Evince as my default PDF viewer in order to work around what I thought was this bug.
However, now that I'm attempting to reproduce this on an up to date Fedora 12 I cannot get this to happen anymore. I deleted my ~/.local/share/applications/mimeinfo.cache etc, and I got evince by default. I also made a new test user without any settings and still got evince by default.
So I'm very sorry for the bug spam but I don't see this anymore as I did previously... therefore I support this bug being closed again :(
just to confirm, looking in defaults.list I see:
Well, I have this in defaults.list,
but these systems all still use evince to try to open pdfs. Since evince can't print most of the pdf files we open (a different bug), I'd rather not have it pop up at all. The only explanation I can figure out for this is that mimecache.info has this:
And even when I go in and change that by hand so that it does not use evince first, the update cache program runs and obliterates the change.
I'm poster of #3 in this thread, and I still think there's a problem
how do you have application/pdf=AdobeReader.desktop in defaults.list ? defaults.list is a static file shipped with the distribution in the shared-mime-info package.
If you want to change the default for pdfs, right click on a pdf file and choose properties, then go to the "Open With" tab.
I need to make a change for all users, not just one user. How else except by editing defaults.list and futzing about with mimecache.info??? We find that Evince does not print most PDFs that our users find. That's a known problem that is being worked on in the evince/cairo teams, but until then I don't want to hear the constant complaints from lab users who say "the printer is not working" (when in fact they've just hit the weird behavior of Evince).
Unfortunately, I don't have a good answer for you. CCing Alex, because he might. (it's been a really long time since I've looked at mime handling stuff and some of the details have changed since I've looked).
From briefly reading the code, it looks like you can make the changes for one user, and then:
mkdir -p /usr/local/share/applications
mv ~/.local/share/applications/mimeapps.list /usr/local/share/applications
That's obviously not a great solution though. What we really need is the ability to edit
and have that work. It doesn't look like the code works that way though.
I think there is some confusion here as to where the bug is:
miminfo.cache is not a priority system, it is just a simple cache that lists (in random order) which desktop files list that they support each mimetype, so that you can avoid reading all the desktop files to get this info.
For each user there is a priority list of what applications should handle each type. This is standardized to some level between kde and gnome. This information is stored in ~/.local/share/applications/mimeapps.list (can be changed with $XDG_DATA_DIRS).
An example file here may look like:
The added associations are added to the list of apps that handle the mime type, and additionally the list is sorted in priority order for picking the default app. The removed associations stuff is so that you can hide system installed apps.
If there is no match in this for the mimetype, then the system default is picked. The system default currently varies between desktops. In gnome we first look at the default.list file and follow its ordering, if there is nothing specified there we pick the first in the (randomly ordered) mimeinfo.cache list. Kde has another system with some form of priority stored in the desktop files.
There has been discussions on having a common system default too, but its hard to come up with a good system there because the exact priorities to user are obviously different on the different desktops, so there has been no progress on this.
Going back to this bug, it seems that something is not following this system but instead only looking at mimeinfo.cache. We ship a default.list file that lists evince as handling pdf files, and kde has its priorities that probably picks okular. And both the gnome code (in gio) and the kde code should be following the standard for user-specific preferences. So it seems to be some application implementing this by itself, wrongly.
So, what applications do you see this behaviour in? nautilus? dolphin? firefox?
Thanks so much for clarifying this.
I only saw this problem in firefox and thunderbird, and it seems to have gone away now that I've upgraded to fedora 12. Is there documentation posted somewhere for developers on how to appropriately interact with the user's preferred applications in gnome and kde and xfce etc? I don't do much development, but when problems like this show up, that documentation would help me track down the problem and maybe file better bug reports. (In hindsight, this was probably a mozilla bug.)
Generally these things are discussed on the email@example.com list and then written down as freedesktop standards. However, the mimeapps.list stuff hasn't actually been written down yet, due to lameness on our (the participants of the discussion) part.
Marking this as closed then.