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Merge #1387 Describe gating in GATING.rst.

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Jan Kaluža
2019-08-22 12:54:39 +00:00
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Modules gating using Greenwave
==============================
Every successfully built module is moved to ``done`` state. Modules in this state cannot
be used as a build-dependency for other modules. They need to be moved to ``ready`` state.
By default, MBS moves the module from ``done`` state to ``ready`` state automatically,
but MBS can also be configured to gate move from ``done`` to ``ready`` state according
to Greenwave service.
When Greenwave integration is configured, then following additional MBS features are enabled:
- When the module is moved to ``done`` state, Greenwave is queried to find out whether to module
can be moved to ``ready`` state instantly.
- If the module cannot be moved to ``ready`` state yet, MBS keeps the module build in the
``done`` state and waits for a message from Greenwave. If this message says that all the
tests defined by Greenwave policy have passed, then the module build is moved to ``ready``
state.
- MBS also queries Greenwave periodically to find out the current gating status for modules
in the ``done`` state. This is useful in case when message from Greenwave has been lost.