Commits on Sep 20, 2024

1. remote_execution: implement OSS write_action_result for `local_only… …

   …` cache uploads
   
   Forward port of part of <facebook#477>,
   which implements code in the OSS path for putting results of actions marked
   `local_only = True` into the RBE `ActionCache`.
   
   For people actually using the "remote execution" part of RBE and not just a
   cache, this rather large omission in the system will often be transparently
   mitigated because RBE services will not only record `ActionCache` entries
   on your behalf, they will also implement "EX-to-AC" forwarding where any
   execution calls will immediately get looked up in the `ActionCache` anyway as an
   optimization. Which means you'll never see this for things that properly hit CAS
   inputs/outputs.
   
   However, a `CommandExecutorConfig` configured with `remote_enabled = False` can
   still enable `remote_cache_enabled = allow_cache_uploads = True` which will both
   enable the ActionCache/CAS support, and also allow uploads to those interfaces
   too.
   
   The most useful example of this type of setup is in a CI system like GitHub
   Actions: where you run the build inside a container or image that provides
   something quasi-hermetic (e.g. including your toolchains), while the RBE system
   is purely a cache storing inputs/outputs/ActionCache entries and never uses
   remote execution.
   
   The hope is that this functionality will soon be plug-and-play on GitHub using
   an RBE-to-GHA caching proxy, so Buck2 projects will be able to get a quick and
   easy cache, but without RE. Therefore this functionality will become highly
   useful.
   
   Co-authored-by: Austin Seipp <aseipp@pobox.com>

   

   cormacrelf and thoughtpolice committed Sep 20, 2024
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