>> reprepro doesn't seem to have one, :( though of course creating a
>> script to do both would work (but it's not optimal). --Cameron
+>>> reprepro has two kind of hooks that could be used. One is called
+>>> whenever a Packages file is changed (normaly used to generate
+>>> Packages.diff files, but it does not need to add new files).
+>>> The other (though only available since 2.1) is called whenever
+>>> a package is added or removed (there is an example in the docs
+>>> for extracting changelogs using this).
+
> For ikiwiki to notice that the Packages file outside its tree has
> changed and things need to be updated, a `needsbuild` hook could be
> used. This seems very doable.