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    Provide a simple read-only maintenance mode for repositories · 3c26e384
    epriestley authored
    Summary:
    Ref T13393. While doing a shard migration in the Phacility cluster, we'd like to stop writes to the migrating repository. It's safe to continue serving reads.
    
    Add a simple maintenance mode for making repositories completely read-only during maintenance.
    
    Test Plan: Put a repository into read-only mode, tried to write via HTTP + SSH. Viewed web UI. Took it back out of maintenance mode.
    
    Maniphest Tasks: T13393
    
    Differential Revision: https://secure.phabricator.com/D20748
    3c26e384