testing/inventory.tf

variable "vm_hosts" {
  default = {
    #"hostname.example.com" = {
    #  provider = "hetzner"
    #  groups = [ "testgroup" ]
    #  volumes = {
    #    data = { size = 32 }
    #  }
    #}
  }
}

variable "groups" {
  default = {
    #testgroup = {
    #  testvar1 = "bla"
    #}
  }
}

variable "ansible_inventory_filename" {
  type = string
  default = "inventory.json"
}

locals {
  vm_hosts_with_groups = {
    for hostname, host in var.vm_hosts: hostname => host if contains(keys(host),"groups")
  }
  vm_hosts_without_groups = {
    for hostname, host in var.vm_hosts: hostname => host if !contains(keys(host),"groups")
  }
  vm_groups = distinct(flatten(values(local.hetzner_vm_hosts_with_groups)[*].groups))
  ansible_inventory = {
    all = {
      hosts = {
        for hostname,host in var.vm_hosts: hostname => {}
      }
      children = merge(
        {
          for group in local.vm_groups: group => {
            hosts = {
              for hostname, host in local.vm_hosts_with_groups:
                hostname => {}
                if contains(host.groups,group)
            }
          }
        },{
          for providername, provider in local.providers: "provider_${providername}" => {
            hosts = {
              for hostname, host in var.vm_hosts:
                hostname => local.providers[host.provider].hostvars[hostname]
                if host.provider == providername
            }
          }
        }
      )
    }
  }
}

output "ansible_inventory" {
  value = local.ansible_inventory
}

resource "local_file" "ansible_inventory" {
    content = jsonencode(local.ansible_inventory)
    filename = var.ansible_inventory_filename
    file_permission = "0644"
    directory_permission = "0755"
}