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Portage rsync hardlink support - 11/07/2018 00:00 GMT

For users of the rsync tree, beginning with sys-apps/portage-2.3.42,
the default behavior for sync operations will use hardlinks in order
to ensure that a repository remains in a valid state if something
goes wrong [1]. For example, if signature verification fails during a
sync operation, the new hardlink behavior will preserve the previous
state of the repository.

The new behavior may conflict with configurations that restrict the
use of hardlinks, such as overlay filesystems. Therefore, users will
have to set "sync-allow-hardlinks = no" in repos.conf if they have
a configuration that restricts the use of hardlinks, but this should
not be very common:

sync-allow-hardlinks = no

Note that it is possible to sync more efficiently using git [2]
instead of rsync, though git consumes an increasing amount of disk
space over time unless shallow pull is enabled via the sync-depth
option in repos.conf [3] (requires sys-apps/portage-2.3.42 or later).

[1] sys-apps/portage: use rsync
    --link-dest to implement atomic repository updates (and abort if
    signature verification fails)
[3] sys-apps/portage: support shallow
    git pull by setting sync-depth = 1 in repos.conf

Posted By: Zac Medico