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multiplexer: Check backends with respect to their read-only nature

Closed multiplexer: Check backends with respect to their read-only nature
fix-multiplexer-check-config into master
Closed Antoine R. Dumont requested to merge fix-multiplexer-check-config into master
  1. May 31, 2024
    • Antoine R. Dumont's avatar
      multiplexer: Check backends with respect to their read-only nature · 12bc3ba8
      Antoine R. Dumont authored 
      Prior to this commit, a multiplexer instance would start during its
initialization to check the configuration of all its backends but also check
whether they can write or not even when not needed. As it exists read-only
backends for a multiplexer, that would just fail to start the service.

This evolves the objstorage to grow a check_write attribute (hence parametric
through configuration file). And then adapts accordingly the multiplexer
constructor so it can check the configuration of its backends according to
their respective configuration.

Refs. #4746
Refs. swh/infra/sysadm-environment#5334
      Verified
      12bc3ba8