Support for setting Sentry DSN

locals.tf

@@ -9,7 +9,8 @@ locals {
   runners_max_builds_string = var.runners_max_builds == 0 ? "" : format("MaxBuilds = %d", var.runners_max_builds)
 
   // Define key for runner token for SSM
-  secure_parameter_store_runner_token_key = "${var.environment}-${var.secure_parameter_store_runner_token_key}"
+  secure_parameter_store_runner_token_key  = "${var.environment}-${var.secure_parameter_store_runner_token_key}"
+  secure_parameter_store_runner_sentry_dsn = "${var.environment}-${var.secure_parameter_store_runner_sentry_dsn}"
 
   // custom names for instances and security groups
   name_runner_agent_instance = var.overrides["name_runner_agent_instance"] == "" ? local.tags["Name"] : var.overrides["name_runner_agent_instance"]

main.tf

@@ -37,6 +37,18 @@ resource "null_resource" "remove_runner" {
   }
 }
 
+resource "aws_ssm_parameter" "runner_sentry_dsn" {
+  name  = local.secure_parameter_store_runner_sentry_dsn
+  type  = "SecureString"
+  value = "null"
+
+  tags = local.tags
+
+  lifecycle {
+    ignore_changes = [value]
+  }
+}
+
 locals {
   enable_asg_recreation = var.enable_forced_updates != null ? ! var.enable_forced_updates : var.enable_asg_recreation
 
@@ -65,6 +77,7 @@ locals {
       runners_gitlab_url                           = var.runners_gitlab_url
       runners_token                                = var.runners_token
       secure_parameter_store_runner_token_key      = local.secure_parameter_store_runner_token_key
+      secure_parameter_store_runner_sentry_dsn     = local.secure_parameter_store_runner_sentry_dsn
       secure_parameter_store_region                = var.aws_region
       gitlab_runner_registration_token             = var.gitlab_runner_registration_config["registration_token"]
       giltab_runner_description                    = var.gitlab_runner_registration_config["description"]
@@ -73,6 +86,7 @@ locals {
       gitlab_runner_run_untagged                   = var.gitlab_runner_registration_config["run_untagged"]
       gitlab_runner_maximum_timeout                = var.gitlab_runner_registration_config["maximum_timeout"]
       gitlab_runner_access_level                   = lookup(var.gitlab_runner_registration_config, "access_level", "not_protected")
+      sentry_dsn                                   = var.sentry_dsn
   })
 
   template_runner_config = templatefile("${path.module}/template/runner-config.tpl",
@@ -137,6 +151,7 @@ locals {
       runners_services_volumes_tmpfs    = join(",", [for v in var.runners_services_volumes_tmpfs : format("\"%s\" = \"%s\"", v.volume, v.options)])
       bucket_name                       = local.bucket_name
       shared_cache                      = var.cache_shared
+      sentry_dsn                        = var.sentry_dsn
     }
   )
 }

template/gitlab-runner.tpl

@@ -75,6 +75,16 @@ fi
 
 sed -i.bak s/__REPLACED_BY_USER_DATA__/`echo $token`/g /etc/gitlab-runner/config.toml
 
+ssm_sentry_dsn=$(aws ssm get-parameters --names "${secure_parameter_store_runner_sentry_dsn}" --with-decryption --region "${secure_parameter_store_region}" | jq -r ".Parameters | .[0] | .Value")
+if [[ `echo ${sentry_dsn}` == "__SENTRY_DSN_REPLACED_BY_USER_DATA__" && `echo $ssm_sentry_dsn` == "null" ]]
+then
+  ssm_sentry_dsn=""
+fi
+
+# For those of you wondering why commas are used in the sed below instead of forward slashes, see https://stackoverflow.com/a/16778711/13169919
+# It is because the Sentry DSN contains forward slashes as it is an URL so it would break out of the sed command with forward slashes as delimiters :)
+sed -i.bak s,__SENTRY_DSN_REPLACED_BY_USER_DATA__,`echo $ssm_sentry_dsn`,g /etc/gitlab-runner/config.toml
+
 # A small script to remove this runner from being registered with Gitlab.
 cat <<REM > /etc/rc.d/init.d/remove_gitlab_registration
 #!/bin/bash

template/runner-config.tpl

@@ -1,5 +1,6 @@
 concurrent = ${runners_concurrent}
 check_interval = 0
+sentry_dsn = "${sentry_dsn}"
 
 [[runners]]
   name = "${runners_name}"

variables.tf

@@ -549,6 +549,12 @@ variable "secure_parameter_store_runner_token_key" {
   default     = "runner-token"
 }
 
+variable "secure_parameter_store_runner_sentry_dsn" {
+  description = "The Sentry DSN name used to store the Sentry DSN in Secure Parameter Store"
+  type        = string
+  default     = "sentry-dsn"
+}
+
 variable "enable_manage_gitlab_token" {
   description = "Boolean to enable the management of the GitLab token in SSM. If `true` the token will be stored in SSM, which means the SSM property is a terraform managed resource. If `false` the Gitlab token will be stored in the SSM by the user-data script during creation of the the instance. However the SSM parameter is not managed by terraform and will remain in SSM after a `terraform destroy`."
   type        = bool
@@ -706,6 +712,12 @@ variable "docker_machine_iam_policy_arns" {
   default     = []
 }
 
+variable "sentry_dsn" {
+  default     = "__SENTRY_DSN_REPLACED_BY_USER_DATA__"
+  description = "Sentry DSN of the project for the runner to use (uses legacy DSN format)"
+  type        = string
+}
+
 variable "docker_machine_egress_rules" {
   description = "List of egress rules for the docker-machine instance(s)."
   type = list(object({