Ebuild
└─ Snapshots

There are two ways to name an ebuild which packages a snapshot version of a source repository:

1. ${last_released_version}_pYYYYMMDD: treat the snapshot as a patch to the last released version.

2. ${upcoming_version}_preYYYYMMDD: treat the snapshot as a prerelease of an upcoming version.

It's common to assume $upcoming_version to be 0 or 0.0.1 for repositories without tags.

See also:

• Gentoo Development Guide > Snapshots and live ebuilds