tree 64564abdc213acb66c83f6782566caf51e194678
parent a67df63ef18f7bcd1398dc5c3622c01c3fcad15d
author David Pursehouse <david.pursehouse@sonymobile.com> 1353026019 +0900
committer David Pursehouse <david.pursehouse@sonymobile.com> 1353123642 +0900

Allow command options to be set from environment variables

Extend the Command base class to allow options to be set from values
in environment variables, if the user has not given the option on the
command line and the environment variable is set.

Derived classes of Command can override the implementation of the method
_GetEnvironmentOptions to configure which of its options may be set from
environment variables.

Change-Id: I7c780bcf9644d6567893d9930984c054bce7351e