hi,
if you find your time would you mind pointing your eyes on bug 262010 [1].
There is interesting idea about loging usefull informations about repository 
for further usage (that thing i find interesting and already implemented [2]). 

But in comment 4 user ask about updates itself. If we have live package and 
revision does not change it is pointless waste of resources to recompile it 
usualy.

So i am asking if it is worth to implement some LIVE_FORCE_BUILD:bool where 
user specify if he wants recompile the package or not and if LIVE_FORCE_BUILD 
is set to false and nothing changes all relevant phases are skipped with 
something like:
elog "Doing nothing because we are UP-TO-DATE already."
which might result in faster emerge @live-rebuild for example because not 
every package is needed to be updated.

[1] - http://bugs.gentoo.org/show_bug.cgi?id=262010
[2] - 
http://git.overlays.gentoo.org/gitweb/?p=proj/x11.git;a=blob;f=eclass/git.eclass;h=17db06c9cd310c1f97360e3ad2d45cb6b30386d3;hb=ef91eb936e50262e32ee8c71c2853cfdbbfe18a1

Cheers
Tomas

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