Variables in XML transforms

Jon_Curtis · 14 August 2013 09:40

Is it possible to use variables in XML config transformations?

David_Roberts · 14 August 2013 15:08

To my knowledge the short answer is No. However you can use Powershell to do something close to the goal I believe you are attempting to get. I have a powershell script that uses special naming to modify config files outside of the regular Octopus Deploy variable transformation.

gist.github.com

https://gist.github.com/davidroberts63/6231873

ConfigFileVariables.ps1


<#
#    Any variables in $OctopusParameters that use the following format will be used.
#
#    {config file name w/o extension (aka BaseName)}:{xpath to node value to change}
#
#    Examples:
#
#    Given the configFilename = log4net.config
#    And an Octopus variable named = log4net://configuration/log4net/appender[@name='FileAppender']/file/@value

This file has been truncated. show original

Sample Octopus Variables for sample.config

$OctopusParameters = @{
  "sample://configuration/someSection/theSubNode" = "Value from script"
}

sample.config

<configuration>
  <someSection>
    <theSubNode>OriginalValue</theSubNode>
  </someSection>
</configuration>

It’s not normal web transformation but it gets the job done. Setup a variable in your Octopus project like: “log4net://configuration/log4net/appender[@name=‘FileAppender’]/file/@value” = “path to your log file”

Then run the script and it will use the first part (before the ‘:’) to determine which config file to apply the variable too. Then it uses the XPath (part after ‘:’) to locate the appropriate node.

The gist above has a sample config file and sample setup of the Octopus parameters. I’m on the jabbr board if it gives you any problems.

a_milorava · 15 June 2015 13:30

Using your script as a module in OD, slightly modified, but overall same basis.
Thank you!