saltstack/salt — pull request #3039 by shadowfax-chc (2012-12-27 16:12:41+00:00)
Title: Modified ebuild upgrade command to preform a full system upgrade.

See: http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml?part=2&chap=1#doc_chap3
"Code Listing 3.13: Performing a full update"