Carl Harris created GUACAMOLE-464:
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Summary: Extension configuration properties from the OS environment
Key: GUACAMOLE-464
URL: https://issues.apache.org/jira/browse/GUACAMOLE-464
Project: Guacamole
Issue Type: New Feature
Reporter: Carl Harris
In the start.sh script of the Docker container image for Guacamole, environment
variables are used to pass configuration properties to several different
authentication providers. The names of the environment variables are derived
from the names of the corresponding properties by converting all letters to
upper case and replacing all hyphens with underscores. It would he helpful if
this was generalized such that the configuration properties for any extension
module could be specified in the environment.
As described in [The Twelve Factor App](https://12factor.net), the environment
should be the preferred way to inject deployment-specific configuration. This
is particularly helpful in the context of containers, but in general is easier
for operations personnel than application-specific configuration
files/formats/locations.
Extension modules generally use an Environment instance to get configuration
property values. Through a relatively small modification of the
LocalEnvironment implementation, the System.getenv(String) method could be used
to first check for the configuration property in the environment (using the
name transformed as described above) and then fall back to retrieving it from
the Properties instance that was used to load guacamole.properties.
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