Translations:Layman/42/en
From Gentoo Wiki
Since the release of layman version 2.2.0, support for squashfs repository types has been included. layman will interact with squashfs repository by mounting them as read-only on the filesystem. On the initial install of the squashfs repository, it will be mounted as read-only. However, after a reboot the repository will no longer be mounted and the ebuilds in that repository will not be accessible by the system.