Support AWS CLI --profile

[bhdicaire]

To the best of my knowledge, it's currently impossible to identify which profile stored in ~/.aws/credentials to use with iamy.

I'll recommend to include profile as pull and push sub parameter to support AWS CLI --profile.

[pda]

This will require a fair bit of internal change;

• awsSession() caches the session; it will need to guard against returning the wrong session for a profile (key the cache by profile, or at least validate the cached session is the same profile as requested).
• the profile name needs to be passed through to all callers of awsSession() (or stored somewhere global 😬)
  • func (a *awsSyncCmdGenerator) deleteOldEntities() calls iam := newIamClient(awsSession())
  • func (a *AwsFetcher) init() calls s := awsSession() for IAM and S3
  • func (a *AwsFetcher) getAccount() (*Account, error) calls acct.Id, err = GetAwsAccountId(awsSession()) for IAM and sometimes EC2.

Instead, you could set AWS_PROFILE in your environment, and aws-sdk-go will pick it up from there as per https://godoc.org/github.com/aws/aws-sdk-go/aws/session#hdr-Creating_Sessions

AWS_PROFILE=foo iamy pull --delete