[JIRA] Created: (CC-1026) Configure environment variables in <exec> configuration

Configure environment variables in <exec> configuration
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                 Key: CC-1026
                 URL: http://jira.public.thoughtworks.org/browse/CC-1026
             Project: CruiseControl
          Issue Type: New Feature
         Environment: all
            Reporter: Daniel Tihelka
            Priority: Major


When running custom scripts (e.g. in python with submodules), the PYTHONPATH environment variable must be set for correct import  of the packages. The variable may be set before CruiseControl is started, but it will not work for project-dependent settings - e.g. when one project requires module of a given version, while another requires different version.

I propose patch extending the <exec /> configuration in the following way:
<exec>
  <!--  Defines new value or sets new value to the existing env variable -->
  <env name="" value=""  />
  <!--  Deletes the existing env variable -->
  <env name="" del="true" />
</exec>
while the <env /> sub-element is optional.

Both 'name' and 'value' may contain references to CC properties, and in addition, if an unresolved property ${PROP} is found in the value, and the environment contains variable named 'PROP', the unresolved property is substituted by the value of the environment variable. In this way, we can extend already existing environment variable, e.g. as:

 <env name="PATH" value="new/path/added:${PATH}" />

where 'PATH' exists only as environment variable, not being defined as CC property. If it is defined as the CC property, its value would be preffered and used.


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