Currently GetComponents assumes that the $USER environment variable is set. This is not true inside of docker containers and requires some workarounds in the Dockerfile to handle correctly.

Pull request https://github.com/gridaphobe/CRL/pull/11/files instead uses Perl’s getpwuid to get the user name from the OS which does not rely on USER. I tested getpwuid to work fine in a Ubuntu container.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2612/getcomponents-assumes-that-user-is-defined