Commits on Jul 28, 2017

1. Relax restrictions on environment variable names. …

   The POSIX standard restricts environment variable names to uppercase
   letters, digits, and the underscore character in shell contexts only.
   For generic application usage, it is stated that all other characters
   shall be tolerated.
   
   This change relaxes the rules to some degree. Namely, we stop requiring
   environment variable names to be strict C_IDENTIFIERS and start
   permitting lowercase, dot, and dash characters.
   
   Public container images using environment variable names beyond the
   shell-only context can benefit from this relaxation. Elasticsearch is
   one popular example.

   

   timoreimann committed Jul 28, 2017
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