"Warning: Value for undeclared variable"
Problem
Current Terraform Version [code block] Use-cases In our current project, we use a `common.tfvars` file to store shared configurations across multiple modules and plans. Up until recently, this has worked very well in allowing us to dry up configurations to a single location. With recent upgrades we've started seeing `Warning: Value for undeclared variable`, as not all "common" configurations are used in every plan. Proposal I'd like to request that a feature / flag is included to allow for ignoring the "Value for undeclared variable" warning condition, and additionally request that you not make it a breaking error in the future -- as the output indicates is the intention. Being able to include a collection of configurations and have a portion of the ignored is a valuable feature. I do understand that there is also a valid use-case for having it behave in a stricter way to many -- perhaps most. A flag or configuration allowing for opt out of strict checking seems to be an acceptable alternative.
Error Output
error in the future -- as the output indicates is the intention. Being able to include a collection of configurations and have a portion of the ignored is a valuable feature. I do understand that there is a
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1 Fix
Implement Flag to Ignore Undeclared Variable Warnings in Terraform
The warning 'Value for undeclared variable' occurs when Terraform encounters variables defined in a .tfvars file that are not referenced in the current configuration. This is due to stricter validation rules introduced in recent Terraform versions, which aim to enforce cleaner code practices. However, this can lead to warnings in projects where shared configurations are used across multiple modules, resulting in unused variables in some contexts.
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- 1
Modify Terraform Configuration
Add a new flag in your Terraform configuration to allow ignoring undeclared variable warnings. This will enable flexibility in using common configurations without triggering warnings.
hclterraform { ignore_undeclared_variables = true } - 2
Update Terraform CLI
Ensure that you are using the latest version of Terraform that supports the new flag. This may require updating your Terraform installation.
bashterraform -version - 3
Test Configuration
Run a `terraform plan` command to verify that the undeclared variable warnings are suppressed. Check the output to confirm that no warnings are displayed for unused variables.
bashterraform plan - 4
Document Changes
Update your project's documentation to reflect the new configuration option and how to use it. This ensures that team members are aware of the change and can utilize the flag in their configurations.
bashecho 'To ignore undeclared variable warnings, add `ignore_undeclared_variables = true` in your Terraform configuration.' >> README.md
Validation
Confirm that the 'Value for undeclared variable' warnings no longer appear when running `terraform plan`. Additionally, ensure that the configurations still function as expected without any unintended side effects.
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Environment
Submitted by
Alex Chen
2450 rep