[Portland-bugs] [Bug 22975] New: xdg-mime takes 15 seconds due to kdeinit/ktradertest bug in KDE4

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=22975

           Summary: xdg-mime takes 15 seconds due to kdeinit/ktradertest bug
                    in KDE4
           Product: Portland
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: xdg-utils
        AssignedTo: portland-bugs at lists.freedesktop.org
        ReportedBy: mdm at chromium.org


Created an attachment (id=28052)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28052)
patch to xdg-mime to work around kdeinit/ktradertest bug in KDE4

Under KDE, xdg-mime will use ktradertest to look up MIME handlers. In KDE4,
ktradertest starts kdeinit (with --suicide --new-startup) if there is not
already a running instance around (which, apparently, there is usually not).
This copy of kdeinit will persist for about 15 seconds after it is last needed,
presumably as an optimization to allow several clients to use the same
instance.

However, kdeinit does not close its standard output, so when ktradertest is
piped into grep by xdg-mime, grep will not exit until the kdeinit process
started by ktradertest exits (because kdeinit still has grep's standard input
open, even after ktradertest has exited). This causes xdg-mime to take about 15
seconds!

The true fix for this is to fix kdeinit/ktradertest, but xdg-mime can and
probably should work around it by running a "patsy" version of ktradertest just
to get kdeinit to start.

Patch attached.

We ran into this bug in Chromium, in the default browser detection code. See
http://code.google.com/p/chromium/issues/detail?id=17179 for reference.


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