James E. Blair 640059a67a Report a config error for unsupported merge mode ... This updates the branch cache (and associated connection mixin) to include information about supported project merge modes. With this, if a project on github has the "squash" merge mode disabled and a Zuul user attempts to configure Zuul to use the "squash" mode, then Zuul will report a configuration syntax error. This change adds implementation support only to the github driver. Other drivers may add support in the future. For all other drivers, the branch cache mixin simply returns a value indicating that all merge modes are supported, so there will be no behavior change. This is also the upgrade strategy: the branch cache uses a defaultdict that reports all merge modes supported for any project when it first loads the cache from ZK after an upgrade. Change-Id: I3ed9a98dfc1ed63ac11025eb792c61c9a6414384		2022-11-11 09:53:28 -08:00
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__init__.py	Report a config error for unsupported merge mode	2022-11-11 09:53:28 -08:00