Re: Command queuing with dpkg à la update-menus
On Sat, 14 Jun 2003, Bill Allombert wrote:
> Hello debian-devel,
>
> I would like to implement something that do the following
> 1) Packages can raise a flag in theirs postinst/prerm
> 2) When dpkg has completed, if at least one flag is raised, a specific
> program is run *once*.
>
> In fact this is already implemented in update-menus but it is rather
> involved:
>
> 1.0) update-menus first check for lock /var/run/update-menus.pid
> 1.1) If found it kill the pid mentionned.
> 1.2) update-menus create the lock.
>
> 2) update-menus check /var/lib/dpkg/lock. If it is locked,
> it goes to background until lock is removed (by checking every second)
> 3) update-menus do its (time-consuming) processing.
>
> As you see, there only one background update-menus process at a time,
> and step 3 will be performed only once. This behaviour is neccessary
> since update-menus is run each time a menu entry is added/removed, so
> this save a lot of processing time.
>
> Now, do you have a simpler solution ? I have a similar problem with
> GAP and I would like to handle it the same way (and why not provide
> a generic framework to do that).
>
> Step 2 is a bit involved since it involve fcntl().
dpkg 2.0 will have hooks.
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