We have discovered that Octopus will automatically pick a value for a variable during a process step when the resolution of that variable is ambiguous. Is there a way to configure the server to fail the step if the variable resolution is ambiguous, or there is no matching variable at all?
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The variable should remain unevaluated if there isn’t a valid scoping against the target. One scenario to watch out for is when a Process Step is scope to a Role but the Target has additional Roles as well. We have a recent GitHub issue on this as the Variable Preview can be misleading.
I can think of two options for failing that may work for you. First, you can use Variable Run Conditions that will only allow a Step to run when the variable expression evaluates to true. The other option would be to add a script Step to the Process that compares the evaluated variable value against a list of acceptable values.
If you have any additional questions, please don’t hesitate to ask.
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