From Gentoo Wiki
- Specifies main repository.
- Makes all repositories inherit eclasses from the specified repositories. Setting this attribute is generally not recommended since resulting changes in eclass inheritance may trigger performance issues due to invalidation of metadata cache.
- The egencache, emirrordist and repoman tools ignore this parameter by default as their operations are generally not site-specific (their operations are focused on the global, non-customized aspects of portage and the Gentoo repository). This behavior can be overruled by setting
force = eclass-overrides.
- Specifies names of attributes, which should be forcefully respected by egencache, emirrordist, and repoman. Valid values: