dpkg database during postinst processing

Hi,

I'm trying to look at the list of installed files from a program that 
uses libdpkg and runs as part of postinst processing.

Simple test case is a package containing a single file /testfile, and a 
postinst "exec /bin/bash -i <>/dev/tty", installed into empty 
installation and database directories.

Here, info/status is empty, and the new package can only be seen in 
updates/000*. When I now call ensure_allinstfiles_available(), the files 
installed with my package are not visible as namenodes.

I'd assume it's the same for all files installed within the same 
transaction -- so I am seeing a slightly outdated view. For dpkg-divert, 
that is probably not a big problem (but might still be wrong), but if I 
want to check for file conflicts caused by aliasing, I absolutely need 
the view to be up-to-date.

Do I need to do anything special to get the current view, or should 
libdpkg provide a current view in any case?

    Simon