Kubernetes Rollout Status - Terraform External Data Source

main.tf

resource "local_file" "kube_config" {
  content  = "${var.kube_config}"
  filename = "${path.module}/kubeconfig"
}

# Hacky way to force a dependency on some external resource (since modules dont support a depends_on)
data "template_file" "deps" {
  template = "${join(",", var.depends_on)}"
}

data "external" "ds" {
  depends_on = ["local_file.kube_config", "data.template_file.deps"]
  program = ["bash", "${path.module}/rollout-status.sh"]
  query {
    name = "${var.name}"
    type = "${var.type}"
    timeout = "${var.timeout}"
    kubeconfig = "${path.module}/kubeconfig"
    namespace = "${var.namespace}"
  }
}

outputs.tf

output "status" {
  value       = "${data.external.ds.result["status"]}"
  description = "Result of the rollout status check"
}

rollout-status.sh

#!/bin/bash

# Exit if any of the intermediate steps fail
set -e

# Extract args to script
eval "$(jq -r '@sh "NAMESPACE=\(.namespace) TYPE=\(.type) NAME=\(.name) TIMEOUT=\(.timeout) KUBE_CONFIG=\(.kubeconfig)"')"

kubectl rollout status ${TYPE} ${NAME} -n ${NAMESPACE} --timeout=${TIMEOUT} --kubeconfig ${KUBE_CONFIG} &> /dev/null

# Safely produce a JSON object containing the result value.
# jq will ensure that the value is properly quoted
# and escaped to produce a valid JSON string.
jq -n --arg status "true" '{"status":$status}'

variables.tf

variable "namespace" {
  description = "Kubernetes namespace"
  default = "default"
}

variable "type" {
  description = "The type of the resource"
  default = "deployment"
}

variable "timeout" {
  description = "The amount of time to wait for the completion, before timing out."
  default = "1m"
}

variable "kube_config" {
  description = "The path of the kubeconfig"
}

variable "name" {
  description = "Name of the resource"
}

variable "depends_on" {
  description = "List of dependencies. To create explicit dependency on external resources."
  default = []
}