Provides a Prolog predicate add_owner_approval/3 that appends label('Owner-Approval', need(_)) to a provided list.

Clone this repo:
  1. 9564784 Migrate submit requirements to `stable-3.6` by Jacek Centkowski · 2 days ago master stable-3.6
  2. 499bbee Return 'true' when submit requirement has no value by Jacek Centkowski · 2 days ago stable-3.5
  3. 313a5a0 Pave the way for the 'stable-3.6' submit requirements migration by Jacek Centkowski · 4 days ago
  4. d48a4ea Optimize the memory footprint for PathOwners cache by Jacek Centkowski · 5 weeks ago
  5. a740d77 Optimize the 'path_owners_entries' cache eviction by Jacek Centkowski · 7 weeks ago

Gerrit OWNERS Plugin

This plugin provides some Prolog predicates that can be used to add customized validation checks based on the approval of ‘path owners’ of a particular folder in the project.

That allows creating a single big project including multiple components and users have different roles depending on the particular path where changes are being proposed. A user can be “owner” in a specific directory, and thus influencing the approvals of changes there, but cannot do the same in others paths, so assuring a kind of dynamic subproject access rights.

How it works

There are currently two main prolog public verbs:

add_owner_approval/3 (UserList, InList, OutList) appends label('Owner-Approval', need(_)) to InList building OutList if UserList has no users contained in the defined owners of this path change.

In other words, the predicate just copies InList to OutList if at least one of the elements in UserList is an owner.

add_owner_approval/2 (InList, OutList) appends label('Owner-Approval', need(_)) to InList building OutList if no owners has given a Code-Review +2 to this path change.

This predicate is similar to the first one but generates a UserList with an hardcoded policy.

Since add_owner_approval/3 is not using hard coded policies, it can be suitable for complex customizations.

Auto assigner

There is a second plugin, gerrit-owners-autoassign which depends on gerrit-owners. It will automatically assign all of the owners to review a change when it's created or updated.

How to build

This plugin is built with Bazel and two build modes are supported:

  • Standalone
  • In Gerrit tree

Build standalone

To build the plugin, issue the following command:

  bazel build :all

The output is created in


To execute the tests run:

  bazel test //...

This project can be imported into the Eclipse IDE:


Build in Gerrit tree

Create symbolic links of the owners and owners-autoassign folders and of the external_plugin_deps.bzl file to the Gerrit source code /plugins directory.

Create a symbolic link of the owners-common plugin to the Gerrit source code directory.

Then build the owners and owners-autoassign plugins with the usual Gerrit plugin compile command.


   $ git clone
   $ git clone
   $ cd gerrit/plugins
   $ ln -s ../../owners/owners .
   $ ln -s ../../owners/owners-autoassign .
   $ ln -s ../../owners/owners-api .
   $ ln -sf ../../owners/external_plugin_deps.bzl .
   $ cd ..
   $ ln -s ../owners/owners-common .
   $ bazel build plugins/owners plugins/owners-autoassign

NOTE: the owners-common folder is producing shared artifacts for the two plugins and does not need to be built separately being a direct dependency of the build process. Its resulting .jar must not be installed in gerrit plugins directory.

The output is created in


To execute the tests run:

  bazel test owners-common:test

This project can be imported into the Eclipse IDE:

Add the plugin name to the CUSTOM_PLUGINS (and in case when you want to run tests from the IDE to CUSTOM_PLUGINS_TEST_DEPS) in Gerrit core in tools/bzl/plugins.bzl file and run: