[mdaniel]

That was the "I can't grok the docs.rs in order to tell you" part; in boto and the sane SDKs, there's a bunch of "Credential Providers" and they're in a list, meaning some are tried before others

I have no idea what implementations there are for this: https://docs.rs/aws-sdk-s3/latest/aws_sdk_s3/struct.Credenti... and its official page is even worse: https://docs.aws.amazon.com/sdk-for-rust/latest/dg/credentia...

Going all the way down to the GH readme seems to back up the investigation that, no, they really seem to have forgotten about "AWS_SESSION_TOKEN": https://github.com/awslabs/aws-sdk-rust#getting-started-with...

[simtel20]

Not sure if this is any better than the docs (which are raw, at best) - I'm a middling beginner rust programmer, but I did do this test[1] for myself and it matches most of the other SDKs.

[1] https://github.com/pcn/check-assume-role-s3/blob/master/src/...

[mdaniel]

That's excellent news, thanks so much for taking the time to put that together!