{'description': {'en': 'Official Gentoo ebuild repository'},
 'feed': ['https://cgit.gentoo.org/repo/gentoo.git/atom/'],
 'homepage': 'https://gentoo.org/',
 'name': 'gentoo',
 'owner': [{'email': 'bug-wranglers@gentoo.org', 'type': 'project'}],
 'quality': 'core',
 'source': [{'type': 'rsync', 'uri': 'rsync://rsync.gentoo.org/gentoo-portage'},
            {'type': 'git',
             'uri': 'https://anongit.gentoo.org/git/repo/gentoo.git'},
            {'type': 'git', 'uri': 'git://anongit.gentoo.org/repo/gentoo.git'},
            {'type': 'git',
             'uri': 'git+ssh://git@git.gentoo.org/repo/gentoo.git'}],
 'status': 'official'}
pkgcore 0.12.8

$ pmaint --config /var/lib/repo-mirror-ci/data-sync/etc/portage sync gentoo
WARNING:pkgcore:foo-overlay repo at '/var/lib/repo-mirror-ci/sync/foo-overlay', doesn't specify masters in metadata/layout.conf. Please explicitly set masters (use "masters =" if the repo is standalone).
*** syncing gentoo
You are not currently on a branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

!!! failed syncing gentoo
 * Sync failed with 1
 * Will try to re-create
$ pmaint --config /var/lib/repo-mirror-ci/data-sync/etc/portage sync gentoo
*** syncing gentoo
Cloning into '/var/lib/repo-mirror-ci/sync/gentoo'...
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Updating files: 100% (87525/87525), done.
*** synced gentoo
 * Sync succeeded after re-adding
$ git log --format=%ci -1
$ git show -q --pretty=format:%G? HEAD
$ pmaint --config /var/lib/repo-mirror-ci/data/etc/portage regen --use-local-desc --pkg-desc-index -t 32 gentoo
 * Cache regenerated successfully