Problem with XDG TryExec, how to force updating menu

jupiter jupiter.hce at
Wed Nov 28 09:56:30 CET 2012


Surely there must a command to trig xfce desktop menu update when I
was calling "touch /usr/share/applicaiton/tryexec_app.desktop. Could
anyone give a clue what is the command or how to trig the menu update
without to run "touch /usr/share/applications/tryexec_app.desktop"?

Thank you.

Kind regards.

On 11/27/12, jupiter <jupiter.hce at> wrote:
> Thanks for the response.
> That package was made from a friend of mine, he installed it on KDE in
> CentOS 6.2, it seems it works in KDE desktop, but not in XFCE 4
> desktop.
> I am not too worry about if I could use the "touch" to make it work,
> but rather try to see whether all xdg features can work properly in
> xfce or not.
> Thank you.
> Kind regards.
> On 11/27/12, Matthew Brush <mbrush at> wrote:
>> On 12-11-26 04:03 PM, jupiter wrote:
>>> Hi,
>>> I am running XFCE 4 on CentOS 6.2. I have an issue when a Linux
>>> package desktop application contains a TryExec statement which does
>>> not update menu when the  If the binary path is present and when it is
>>> executable according to the XDG spec.
>>> The package has two desktop applications in /usr/share/applications,
>>> request.desktop and response.desktop. the response.desktop has the
>>> statement "TryExec=/usr/local/bin/", but that script is not
>>> available until the application in request.desktop is called. It seems
>>> that the menu is not updating after the
>>> "TryExec=/usr/local/bin/" is available and therefore the
>>> response application could not see on the menu.
>> I doubt it sits there constantly polling the TryExec path, but rather
>> I'd guess it uses file monitoring on the desktop entry itself (or the
>> whole applications directory) to detect changes which triggers a
>> reload/recheck (which would explain why "touch"ing it causes an update).
>> I didn't look at the source, so it's just a guess, but it seems the most
>> sane way to do it.
>>> The only thing I could make the response item on menu is run "touch
>>> /usr/share/applications/response.desktop" which triggering the menu
>>> update. It is ugly and it is not workable.
>>> Are there any commands / utilities can be used to force updating menu?
>> You could delete the TryExec line from the response.desktop one so
>> there's no check performed and it's always in the menu (the spec says
>> it's not required). Another way would be to replace the request.desktop
>> Exec command with a custom script that runs the original program and
>> then "touch"es the response.desktop.
>> Out of curiosity, what is the package with this weird desktop entry
>> inter-dependency that is creating and deleting files in /usr/local/bin?
>> Cheers,
>> Matthew Brush
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