gtk-update-icon-cache %posttrans (was Re: Error output from rpm pre/post scripts)

[Panu Matilainen]

On Thu, 5 Jul 2007, Toshio Kuratomi wrote:

> On Thu, 2007-07-05 at 16:15 -0400, Matthias Clasen wrote:
>> On Thu, 2007-07-05 at 16:13 -0400, Jesse Keating wrote:
>>> On Thursday 05 July 2007 16:15:02 Michael Thomas wrote:
>>>> What about adding 'Requires(post): coreutils' to bring in 'touch' for
>>>> the gtk+ icon cache scriptlet:
>>>> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246770
>>>>
>>>> It seems excessive to me, because I can't imagine a situation where
>>>> coreutils would not get installed.  But I also haven't looked that
>>>> closely at the dependency tree either.
>>>
>>> Often it's not about whether it will be installed or not, but rather it's
>>> about whether it will be installed /before/ your %pre/%post script is ran if
>>> the packages are in the same transaction (IE installer or big upgrades).
>>>
>>
>> Now that we are discussing this again, I'd like to point out that the
>> recent ldconfig/%posttrans discussion is somewhat related to this. If
>> we can make %posttrans useful for ldconfig, we can use it for icon cache
>> updates too. That would be a big win.
>>
> That would be great.  Unfortunately, %posttrans doesn't work in the
> ldconfig case because it doesn't run when only erasing packages.  Will
> that make a difference for gtk-update-icon-cache as well?

Well, the cache wouldn't be updated when packages are removed so it would 
cache nonexistent icons. Dunno how bad that is in reality.

What both ldconfig and gtk-update-icon-cache really beg for is a system, 
not package-level scripts that do stuff after the transaction completes.
Yum and apt both have such a mechanism, what's missing is one on plain rpm 
level.

Of course it would be possible to add some tracking mechanism ("touch 
need-ldconfig" style) but is it actually needed... I think not. It could 
be dirt simple like:

--
#!/bin/sh
/sbin/ldconfig
[ -x /usr/bin/gtk-update-icon-cache ] && /usr/bin/gtk-update-icon-cache

# any other similar stuff
--

That completes fast enough not to be noticeable *at all* when run just 
once at end of any transaction (the vast majority of the time spent will 
be in the transaction in all cases really), regardless of whether 
libraries or gtk-icon containing packages were installed or removed.

 	- Panu -