After 9defce6, commands have started to return exit status 1 if glacier warnings are encountered during execution. It is a breaking change for users who use version v1.3.0. I think it would be useful to add a flag for turning on/off glacier warnings similar to (--ignore-glacier-warnings)). As default, commands should exit with 0 for glacier warnings if we don't wanna break current API (v1.3.0).