Merge pull request #53 from segmentio/allow-overriding-region

Allow overriding region

README.md

@@ -144,6 +144,8 @@ Chamber does not currently read the value of "AWS_DEFAULT_REGION". See
 [https://github.com/aws/aws-sdk-go#configuring-aws-region](https://github.com/aws/aws-sdk-go#configuring-aws-region)
 for more details.
 
+If you'd like to use a different region for chamber without changing `AWS_REGION`, you can use `CHAMBER_AWS_REGION` to override just for chamber.
+
 ### Using Path Based Keys
 
 If you'd prefer to use path based keys (`/service/key`) instead of the default period separated keys (`service.key`), you

store/ssmstore.go

@@ -47,6 +47,10 @@ func NewSSMStore(numRetries int) *SSMStore {
 		region, _ = ec2metadataSvc.Region()
 	}
 
+	if regionOverride, ok := os.LookupEnv("CHAMBER_AWS_REGION"); ok {
+		region = regionOverride
+	}
+
 	ssmSession := session.Must(session.NewSession(&aws.Config{
 		Region: aws.String(region),
 	}))