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From "J.C. Hamlin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IVY-1367) Support Conditional Setting of a Property
Date Tue, 31 Jul 2012 23:16:34 GMT
J.C. Hamlin created IVY-1367:
--------------------------------

             Summary: Support Conditional Setting of a Property
                 Key: IVY-1367
                 URL: https://issues.apache.org/jira/browse/IVY-1367
             Project: Ivy
          Issue Type: New Feature
          Components: Core
    Affects Versions: 2.2.0
            Reporter: J.C. Hamlin
            Priority: Minor


Please allow a way to make conditional use of environment variables in ivysettings.xml. If
the environment variable is set, then set the property, otherwise, don't set the property.
This can be generalized into a general test to set a property only if another property is
set.

Something like this, where the "ifset" is the new attribute of the property element.

  <properties environment="env"/>
  <property name="ivy.repos.server" value="${env.IVY_SERVER}" override="false" ifset="env.IVY_SERVER"
/>
  <property name="ivy.repos.server" value="http://ivy:8081" override="false"/>

In ant, you do something like this, which is very similar (but more verbose):

  <condition property="ivy.repos.server" value="${env.IVY_SERVER}">
    <isset property="env.IVY_SERVER"/>
  </condition>
  <property name="ivy.repos.server" value="http://ivy:8081"/>

So, if a user defines an environment variable it will override the default value provided
by the system. And if the environment variable is not defined in the environment, then the
system default value can apply.


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