Fix region configuration for LoginCredential's Signin client #3319
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jterapin
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Nov 20, 2025
dobrite
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Nov 24, 2025
We're invoking the credential provider chain in our production code with no args: ``` Aws::CredentialProviderChain.new.resolve ``` This fails on 176 with a `NameError` when config is enabled: ``` NameError: undefined local variable or method `region' for #<Aws::CredentialProviderChain:0x00000001094dc100 @config=nil> aws-sdk-core-3.239.1/lib/aws-sdk-core/credential_provider_chain.rb:176:in `login_credentials' aws-sdk-core-3.239.1/lib/aws-sdk-core/credential_provider_chain.rb:13:in `block in resolve' aws-sdk-core-3.239.1/lib/aws-sdk-core/credential_provider_chain.rb:12:in `each' aws-sdk-core-3.239.1/lib/aws-sdk-core/credential_provider_chain.rb:12:in `resolve' ``` PR aws#3319[^1] inadvertently caused this error by not checking if config was passed. Elsewhere in the file the code is guarding against that. Write a failing test, then make it pass. [^1]: aws#3319
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Fixes issue where Signin client initialization fails due to missing region configuration.
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