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Description of problem:
currently supported keywords by image-minimizer are:
drop <file path pattern>
keep <file path pattern>

which specify which part of the filesystem is removed, during creation.

Example usage:
%post --nochroot --interpreter image-minimizer
drop /usr/lib/libboost*
keep /usr/lib/libboost_program_options.so*
keep /usr/lib/libboost_filesystem.so*
keep /usr/lib/libboost_thread-mt.so*
keep /usr/lib/libboost_system.so*
drop /usr/kerberos
keep /usr/kerberos/bin/kinit
keep /usr/kerberos/bin/klist
%end

To support rhev-h blacklisting, following keywords are added:
droprpm <rpm name pattern>
keeprpm <rpm name pattern>

Example usage:
%post --nochroot --interpreter image-minimizer
droprpm perl-*
keeprpm perl-libs
%end

Posted upstream https://www.redhat.com/archives/thincrust-devel/2010-July/msg00003.html

Reposted upstream https://www.redhat.com/archives/thincrust-devel/2010-July/msg00007.html

Follow-up patch to support drop-keep-drop
https://www.redhat.com/archives/thincrust-devel/2010-July/msg00009.html