In Gerrit, we assign permissions to groups of accounts. These groups can be provided by an external system such as LDAP, but Gerrit also has a group system built-in ("internal groups")
Starting from 2.16, these internal groups are fully stored in NoteDb.
A group is characterized by the following information:
list of members (accounts)
list of subgroups
Groups are keyed by the following unique identifiers:
GroupID, the former database key (a sequential number)
UUID, an opaque identifier. Internal groups use a 40 byte hex string as UUID
Name: Gerrit enforces that group names are unique
Group data is stored in the
All-Users repository. For each
group, there is a ref, stored as a sharded UUID, e.g.
The ref points to commits holding files. The files are
members, holding numeric account IDs of members, one per line
subgroups, holding group UUIDs of subgroups, one per line
group.config, holding further configuration.
group.config file follows the following format
[group] name = <name of the group> id = 42 visibleToAll = false description = <description of the group> groupOwnerUuid = <UUID of the owner group>
Gerrit updates the ref for a group based on REST API calls, and the commit log effectively forms an audit log which shows how group membership evolved over time.
To ensure uniqueness of the name, a separate ref
refs/meta/group-names contains a notemap, ie. a map represented as a
branch with a flat list of files.
The format of this map is as follows:
keys are the normal SHA1 of the group name
values are blobs that look like
[group] name = <name of the group> uuid = <hex UUID identifier of the group>
To ensure uniqueness of the sequential ID, the ID for each new group
is taken from the sequence counter under
which works analogously to the ones for accounts and changes.
Group ownership together with
visibleToAll determines visibility of
the groups in the REST API.
Fetching a group ref is permitted to the group’s owners that also have
READ permissions on the ref. For users that are not owners, the
permissions on the ref are ignored. In addition, anyone with the
capability can read all group refs. The
refs/meta/group-names ref is
visible only to users with the
Pushing to group refs
Validation on push for changes to the group ref is not implemented, so pushes are rejected. Pushes that bypass Gerrit should be avoided since the names, IDs and UUIDs must be internally consistent between all the branches involved. In addition, group references should not be created or deleted manually either. If you attempt any of these actions anyway, don’t forget to Index Group reindex the affected groups manually.
In a replicated setting (eg. backups and or master/replica
configurations), all refs in the
All-Users project must be copied
onto all replicas, including