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https://issues.apache.org/jira/browse/MINIFI-424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324727#comment-16324727
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Joseph Percivall commented on MINIFI-424:
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Any ideas what we could use for the "escape" identifiers are welcome.
> Expose bootstrap properties in the ConfigTransformer
> ----------------------------------------------------
>
> Key: MINIFI-424
> URL: https://issues.apache.org/jira/browse/MINIFI-424
> Project: Apache NiFi MiNiFi
> Issue Type: New Feature
> Reporter: Joseph Percivall
> Assignee: Joseph Percivall
>
> The ConfigTransformer takes in the config.yml and creates the nifi.properties
> and flow.xml. In order to better support customizations on a per MiNiFi
> instance for things that aren't able to reference EL, we could expose the
> properties listed in the bootstrap.conf.
> As an example, the bootstrap conf could have properties identifying the S2S
> URL and port UUID to use. Then when MiNiFi pulls down the new config.yml it
> would translate the keys to their proper values as identified in the
> bootstrap.conf.
> The main unknown is what the "escape" identifiers would be. In EL it is
> "${.....}". This would need to be specific enough that it doesn't collide
> with anything that'd be in the config.yml.
> Much further down the line, this could eventually evolve to expose ENV
> variables, key/values stored in a file, and maybe even basic functions as
> needed. Essentially a basic version of EL but I hesitate to call it that b/c
> I don't want users to expect all of that functionality. This should really be
> for things that can't be done via EL.
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