Can I skip a component from being applied if the before_hook fails?

[flixman]

I have a terragrunt repository that deploys a web app, and in that component I have a before_hook checking the image of the app on a container registry exists. Is there any way to skip the application of this component if the before_hook fails, but letting the application of the rest of the infrastructure continue?

[yhakbar]

Ya, this is an example of how you'd do that:

# ./foo/main.tf

# ./foo/terragrunt.hcl
terraform {
	source = "."
	before_hook "flaky" {
                commands = ["plan", "apply"]
		execute = ["bash", "-c", "echo 'ERROR: Flaky hook!'; exit 1"]
	}
}

errors {
    ignore "flaky_hook" {
        ignorable_errors = [
            ".*ERROR: Flaky hook!.*",
        ]
        message = "Excluding unit from queue because of flaky hook"
    }
}

# ./bar/terragrunt.hcl
dependency "foo" {
	config_path = "../foo"

	mock_outputs = {
		"foo" = "mock foo"
	}
}

# ./bar/main.tf

Basically, use the errors configuration block to detect the error from your before hook, suppress the error, then proceed with the rest of the run queue.