allowed_pattern could not be 0 symbols hence omitted

[T0tt1]

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Terraform CLI and Terraform AWS Provider Version

Affected Resource(s)

• aws_ssm_parameter

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key: https://keybase.io/hashicorp
resource "aws_ssm_parameter" "default" {
  count           = var.enabled == "true" ? length(var.parameter_write) : 0
  name            = lookup(var.parameter_write[count.index], "name")
  description     = lookup(var.parameter_write[count.index], "description", lookup(var.parameter_write[count.index], "name"))
  type            = lookup(var.parameter_write[count.index], "type", "SecureString")
  key_id          = lookup(var.parameter_write[count.index], "type", "SecureString") == "SecureString" && length(var.kms_arn) > 0 ? var.kms_arn : ""
  value           = lookup(var.parameter_write[count.index], "value")
  overwrite       = lookup(var.parameter_write[count.index], "overwrite", "false")
  allowed_pattern = lookup(var.parameter_write[count.index], "allowed_pattern", "")
  tags            = var.tags
}

Debug Output

https://gist.github.com/T0tt1/e74a2b8f56e1dadeee74803904b6d475

Panic Output

Expected Behavior

allowed_pattern is optional attribute hence should be able to skip setting the attribute

Actual Behavior

Terraform expects length of the allowed_pattern attribute to be ` symbol at minimum

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000

[ewbankkit]

Related:

#17819
#17830

[ewbankkit]

@T0tt1 Thanks for raising this issue.
Is this a new or existing Terraform configuration? The additional validation of the allowed_pattern attribute was added in v3.35.0 of the Terraform AWS Provider and we would like to know whether this is a regression or not.

[T0tt1]

This is an existing configuration and it just happened to update the version of provider to the latest one yesterday and start throwing these errors while trying to deploy. I haven't tested if I create a new configuration from scratch if will fail in the same way during the terraform apply - just fyi.

[ewbankkit]

Related:

• new AWS provider 3.35 can't set aws_ssm_parameter with tags and overwrite #18550

[ewbankkit]

@T0tt1 As a workaround you could try allowed_pattern = lookup(var.parameter_write[count.index], "allowed_pattern", null).

[ghost]

This has been released in version 3.36.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!