By default, `emaint sync' runs all sync commands at normal verbosity. If the PORTAGE_QUIET environment variable is set, then all sync commands are run quietly. It should be possible to set quiet/verbose for individual repos. Like, main gentoo repo is sync'd quietly, but overlays are sync'd with default output. This is somewhat possible by using the sync-*-extra-opts variables in repos.conf. But it's not completely possible in the case of git. There's a sync-git-pull-extra-opts variable, by which `git pull' can be made quiet. But emaint also runs `git merge' (see https://gitweb.gentoo.org/proj/portage.git/tree/lib/portage/sync/modules/git/git.py?id=1339a02103f57c456851d69d427bc130bcb671bc#n411), and the only way to get `git merge' to run quietly is to set PORTAGE_QUIET (see https://gitweb.gentoo.org/proj/portage.git/tree/lib/portage/sync/modules/git/git.py?id=1339a02103f57c456851d69d427bc130bcb671bc#n405). It would be nice to have a 'sync-quiet' and a 'sync-verbose' option available in the repository section of repos.conf for granular, per-repo setting of sync verbosity, no matter what sync method is used.
