XPath and Structured Configuration Variables gotcha

This is not necessarily a bug in Octopus, but I thought it may help others in the future.

I’m using the XPath variable replacement available when using the ‘Structured Configuration Variables’ (SCV) feature.

I had these 2 variables defined:

  • WebURL
  • /configuration/appSettings/@key='WebURL'

Since the SCV feature can handle both formats, it doesn’t actually like you including the full XPath version.
If you do you will get an XPath exception:

    System.NullReferenceException: Object reference not set to an instance of an object.
08:25:45   Error    |       at System.Xml.XPath.XPathNodeIterator.Enumerator.get_Current()
08:25:45   Error    |       at Calamari.Common.Features.StructuredVariables.XmlFormatVariableReplacer.ModifyFile(String filePath, IVariables variables)

Removing the XPath version of the variables fixes the issue.


Hi Tony,

Thanks for letting us know, great pickup!


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