Bug 175880 - Yelp fails to open any docbook files, with error "An unknown error occured There is no default action associated with this location."
Yelp fails to open any docbook files, with error "An unknown error occured T...
Product: Fedora
Classification: Fedora
Component: yelp (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Dave Malcolm
Depends On:
Blocks: FC5Target
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Reported: 2005-12-15 17:08 EST by Dave Malcolm
Modified: 2007-11-30 17:11 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2005-12-19 23:51:50 EST
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Tracker ID Priority Status Summary Last Updated
GNOME Bugzilla 324926 None None None Never

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Description Dave Malcolm 2005-12-15 17:08:30 EST
Description of problem:
Yelp seems to be totally broken; any attempt to open an xml help file fails

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.  Click on Desktop/System menu -> Help, or run "yelp" from terminal
2.  See "Help Topics", click on e.g. Desktop
3.  Mouseover "User Guide", then click it.
Actual results:
mouseover shows a local URL of an xml file, of the form
Clicking on it brings up an error dialog:
bold text "An unknown error occured"
extra text: "There is no default action associated with this location."

Expected results:
It should open the help file.
Comment 1 Dave Malcolm 2005-12-15 17:10:38 EST
Confirmed on another machine, with yelp-2.13.1-1
Comment 2 Dave Malcolm 2005-12-15 18:51:48 EST
It's doing a gnome_url_show on the URL, which internally calls
gnome_vfs_url_show_with_env, which appears to be returning
Comment 3 Dave Malcolm 2005-12-15 18:59:24 EST
Looking in Nautilus at a typical file:

It's reported as having mimetype:

Open With tab gives no applications selected for handling files of type DocBook

Comment 4 Dave Malcolm 2005-12-15 19:11:47 EST
Looks like Yelp should be registered as a handler for DocBook files.

yelp.desktop.in.in (from upstream tarball) doesn't include any mime types, and
neither does the generated yelp.desktop (in the resulting rpm) 

See http://www.fedoraproject.org/wiki/ScriptletSnippets
for related packaging notes for the specfile.
Comment 5 Dave Malcolm 2005-12-16 11:46:02 EST
That doesn't fix it, and running 
yelp /usr/share/gnome/help/user-guide/C/user-guide.xml
also fails (yelp tries to spawn an external progam, and if it's registered to
handle docbook, spawns itself in a loop)

Looks like get_doc_type doesn't recognize the new mimetype for DocBook, and is
returning YELP_DOC_TYPE_EXTERNAL; I'll patch this for our packages and send it
Comment 6 Dave Malcolm 2005-12-16 12:08:56 EST
Hmmm.. nautilus is reporting it as "application/docbook+xml", but inside yelp,
gnome_vfs_get_mime_type is reporting it as "application/xml".  (slow vs fast
mime sniffing?)  I'll patch it so that yelp can survive either...
Comment 7 Dave Malcolm 2005-12-16 12:24:45 EST
Grrr... at least it can start loading the user guide now, but gives an error
dialog generating the HTML:

Could not process document

The document ‘/usr/share/gnome/help/user-guide/C/user-guide.xml’ could not be
processed. The file ‘/usr/share/yelp/xslt/db2html.xsl’ is either missing, or it
is not a valid XSLT stylesheet.

On starting from a terminal we get some extra debug output:
I/O warning : failed to load external entity "/usr/share/xml/gnome/xslt/d
compilation error: file /usr/share/xml/gnome/xslt/docbook/html/db2html.xsl line
45 element include
xsl:include : unable to load
Comment 8 Dave Malcolm 2005-12-16 12:26:24 EST
Seems to affect all documentation, not just the user guide...
Comment 9 Dave Malcolm 2005-12-16 14:28:59 EST
This was with gnome-doc-utils-0.5.1-1; db2html-bibliography.xsl is indeed
referenced but not installed (the various other stylesheets are) 

Comment 10 Dave Malcolm 2005-12-16 14:34:13 EST
Looks like this was fixed 2 weeks ago in the upstream Makefile.am and we need a
new upstream tarball of gnome-doc-utils:
Comment 11 Dave Malcolm 2005-12-16 14:48:37 EST
I've filed the gnome-doc-utils problem here:

Building with the fix for the mimetype problem into rawhide as yelp-2.13.2-2 
Comment 12 Dave Malcolm 2005-12-16 15:15:47 EST
Sent upstream (with patch) here: http://bugzilla.gnome.org/show_bug.cgi?id=324296

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