region and profile handling improved

include/aws_profile_loader

@@ -17,6 +17,9 @@
 # instance profile (metadata server) if runs in an EC2 instance
 
 INSTANCE_PROFILE=$(curl -s -m 1 http://169.254.169.254/latest/meta-data/iam/security-credentials/)
+if echo "$INSTANCE_PROFILE" | grep -q '404 - Not Found'; then
+    INSTANCE_PROFILE=
+fi
 
 if [[ $PROFILE ]]; then
   PROFILE_OPT="--profile $PROFILE"
@@ -32,3 +35,13 @@ else
     PROFILE="default"
     PROFILE_OPT="--profile $PROFILE"
 fi
+
+# Set default region by aws config, fall back to us-east-1
+REGION_CONFIG=$(aws configure get region)
+if [[ $REGION_OPT ]]; then
+    REGION="$REGION_OPT"
+elif [[ $REGION_CONFIG ]]; then
+    REGION="$REGION_CONFIG"
+else
+    REGION="us-east-1"
+fi