CODEWITHSUNDEEP
terraformterraform-provider-azureterraform0.12+
szymon
szymon

Reputation: 1040

How to ignore change of an attribute in block

I'm deploying web apps in Azure and I'd like to ignore changes to scm_type attribute within site_config block.

During deployment the scm_type attribute set to None and later we are changing it to something different in Azure Portal.

My current TF code looks like this:

resource "azurerm_app_service" "web_app" {
  count               = length(var.app_names)
  name                = var.app_names[count.index]
  location            = data.azurerm_resource_group.app_resource_group.location
  resource_group_name = data.azurerm_resource_group.app_resource_group.name
  app_service_plan_id = azurerm_app_service_plan.app_plan.id
  tags                = var.tags
  app_settings        = var.app_settings[count.index]

  site_config {
    always_on                 = true
    websockets_enabled        = var.websockets_enabled[count.index]
    use_32_bit_worker_process = var.use_32_bit_worker_process
    scm_type                  = "None"
  }

  lifecycle {
    ignore_changes = [
      site_config.0.scm_type
    ]
  }
}

I expect terraform plan to ignore changes in scm_type during infrastructure updates, but it's trying to revert it back to None. Line from terraform plan output:

~ scm_type = "BitbucketGit" -> "None"

Upvotes: 56

Views: 67944

Answers (4)

Krzysztof Madej
Krzysztof Madej

Reputation: 40919

It seems that syntax changed. M_dk confirmed that site_config["scm_type"] doesn't work in terraform 1.1.5. And it is the same in version 1.3.9. What is even worse it doesn't throw error.

It ignores whole site_config, what effectively blocks changing the site.

For version 1.1.5 and above proper syntax is:

lifecycle {
    ignore_changes = [
        site_config[0].scm_type
    ]
}

Upvotes: 5

Venkata Subbaiah
Venkata Subbaiah

Reputation: 31

lifecycle {
    ignore_changes = [
        site_config["scm_type"]
    ]
}

here site_config["scm_type"]

without comma(,) also it will work

Here are the docs that have the syntax.

https://spacelift.io/blog/terraform-resource-lifecycle

Upvotes: 2

Jamie
Jamie

Reputation: 3347

I think you need to fix your syntax in the ignore changes. It should look like this, or at least from what I have been able to get to work.

lifecycle {
    ignore_changes = [
        site_config["scm_type"],
    ]
}

Here are the docs that have the syntax.

https://www.terraform.io/docs/language/meta-arguments/lifecycle.html#ignore_changes

Upvotes: 54

szymon
szymon

Reputation: 1040

It was a terraform bug: https://github.com/hashicorp/terraform/issues/21433 My syntax is correct, in version 0.12.4 it's working again.

Upvotes: 18

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