default region set in ~/.aws/config is ignored by call ec2.DescribeInstances() #bug

[smile-on]

How to reproduce bug:

1. use widows aws cli to configure shared credentials and set default region
2. verify cli works C:> aws.exe ec2 describe-instances
3. have region hardcoding removed in standard describe-instances sdk example

// svc := ec2.New(session.New(), &aws.Config{Region: aws.String("us-west-2")})
svc := ec2.New(session.New())

run the example and you get error MissingRegion: could not find region configuration

[smile-on]

There is similar issue #384 where this is stated as limitation rather than bug. Would be nice to make this "limitation" documented, well at least be clear in describe-instances sdk example and instead of vague

// Note that you can also configure your region globally by
// exporting the AWS_REGION environment variable

write clearly

// Note that if you want configure your region globally 
// due to current limitation, you must configure it by
// exporting the AWS_REGION environment variable
// setting in ~/.aws/config file is ignored.

Same way as programmer does "AWS_REGION must be configured to run integration tests"

[jasdel]

Hi @smile-on thanks for contacting us. Correct #384 covers the feature request of adding support for the AWS CLI's config file to the Go SDK.

I've updated the README.md to be more clear that the AWS CLI's ~/aws/config file is not currently supported by the Go SDK and only the ~/aws/credentails shared credentails file is supported.

Closing this issue as the readme is updated, and #384 covers adding support for the aws/config file.