Improve error message when S3 bucket name is taken

[crea1]

Was struggling for a while with running concourse-up deploy <projectname>. And got stuck with this error message.

Forbidden: Forbidden
	status code: 403, request id: 1234567890123456

After alot of headscratching we found out this was because the S3 bucket name was already taken. It looks like the bucket name is constructed like this.

concourse-up-<projectname>-<region>-blobstore
concourse-up-<projectname>-<region>-config

Probably a lot of people will try to use "ci" or something similar as project name and get the same error as I did. A better error message would've saved me some time on debugging.

Cheers,
Marius

[karlkfi]

Duplicate of #17 but thanks for the extra details.

[will-gant]

Hi. I agree that kind of error is completely unhelpful, and that it'd be better if we presented something a bit more informative when there are AWS errors.

I've added a story to our Icebox, which will be considered by the PM in due course.

[vanjan]

I'm also getting a 403 but must be a different reason, as I don't have any s3 buckets yet. How can I debug this further?

Forbidden: Forbidden
	status code: 403, request id: 0716BC31FDCF4F05, host id: ciP7058tk3s8XYKGSor69G8Olv8W8XGUGGkqeTB+dX4Io0TCRnxrT5ROtIxkefMGobp876n6mJI=

edit: oh, s3 bucket names have to be unique across all AWS users...