#NOT IN USE:
#(currently overlay has to be given in the spec file when building a stage:
# portage_overlay: /etc/spb2/portage)
# create the portage tarball including spblinux overlay:
#   - all packages which exist in overlay /etc/spb2/portage AND in /usr/portage
#     have to be renamed
#         inside /usr/portage to *.orig
#     why? catalyst merges both directories into one which would give bad
#     checksums (renaming automatically undone with next emerge sync command).
#IN USE:
# to be run as
# catalyst -s 2007.0 -f /bak_spb/gentoo/snapshot.spec