pkgcheck scan must be run from all related ebuild directories (or related category directories or top-level directory) on the tip of the local master branch (as in: right before you push and also after resolving push-conflicts).
Every commit on the left-most line of the history (that is, all the commits following the first parent of each commit) must be GPG signed by a Gentoo developer.
Commits may span across multiple ebuilds/directories if it's one logical change.
All commits must be pkgcheck-valid (exceptions only on right-hand branches).
7.9 Automatic git pull/rebase merge involving conflicts with KEYWORDS.
7.8 A cli-tool to crawl through pull requests.
7.7 Retaining commit author information.
7.6 Preventing 'git repack -a' from touching huge packs.
7.5 Grafting Gentoo history onto the active repository.
7.3 Using the gentoo git checkout as your local tree.