fix: Temporarily disable universe domain query from GCE metadata server #493
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This is Ruby's response to internal issue b/349488459. In this PR, we add a (temporary, optional) attribute (
disable_universe_domain_check) to credential objects that signals the credential may incorrectly claim googleapis as its universe domain. This will be used for GCECredentials temporarily; when set (which for now it will be), GCECredentials will not query the metadata server for universe domain but will instead hard-codegoogleapis.com. Then, the client libraries (in gapic-common, via googleapis/gapic-generator-ruby#1119) will check for thedisable_universe_domain_checkattribute, and if present and set, will not perform the universe domain consistency check. This will effectively stop universe domain MDS calls and checks for GCE credentials while leaving them active for all other credential types. It will also not break existing normal (googleapis) users because those credential objects will continue to reportgoogleapis.comas the universe. Early testers of non-googleapis universes will simply have to update both the googleapis and gapic-common gems.