[mythtv-users] Using mythlink.pl in a system event.

Zarthan South zarthan at gmail.com
Tue Feb 7 16:18:35 UTC 2012


Thanks
The only reason I had for wanting to delete the individual links was
thinking that recreating the links might disturb an in progress video
playing. I will add mythlink to a system event and see what happens.

Thanks again.

On Mon, Feb 6, 2012 at 6:28 PM, Michael T. Dean <mtdean at thirdcontact.com>wrote:

> On 02/06/2012 06:49 PM, Zarthan South wrote:
> > I have mythlink.pl as a part of a userjob. It is suggested that you
> > can use mythlink.pl with "Recording deleted" and "Recording expired"
> > system events to just remove the deleted links. Can someone tell me
> > the format of the event entry.
> > Would it be just
> >     /path/to/mythlink --link /tv/shows --chanid --starttime ??
>
> mythlink.pl, itself, cannot be used to remove individual symlinks.
>
> What the wiki page ( http://www.mythtv.org/wiki/Mythlink.pl ) is trying
> to suggest is:
>   a) when receiving a "Recording deleted" or "Recording expired" system
> event, just do a "full" run of mythlink.pl, which will delete all links
> in the link/destination directory, then create new links for all recordings
>   b) when receiving a "Recording deleted" or "Recording expired" system
> event, run your own script that figures out which recording got deleted
> and deletes its symlink
>
> Option b) isn't that difficult, as the name of the file should be
> <chanid>_<starttime>.<ext> (with the appropriate start time format), so
> you could do a long list of the directory/directories content and grep
> for the recording file name, then remove that link (possibly checking
> that the file it references is, in fact, no longer on the file system).
> Alternatively, you could just check every link in the
>
> By the time the recording is deleted, though, we no longer have
> recording database metadata available to get a definitive file name from
> the database via the bindings.  This "uncertainty" and the fact that a
> "full run" of mythlink.pl nicely cleans up the links to the deleted
> recording(s) (and any other garbage/orphaned links) is the main reason
> that mythlink.pl doesn't try to handle "single link deletes" itself.
>
> My recommendation is to just create a script to run mythlink.pl without
> --chanid/--starttime/--filename arguments and run it when you get a
> Recording deleted/expired event.  You could even do a simple "locking"
> mechanism for it (to ensure only one "full-run" copy of mythlink.pl is
> executed at a time and to allow "rolling up" multiple close-in-time
> requests into a single run).
>
> Mike
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