/*
    DESCRIPTION:
    Ubuntu Server 20.04 LTS Kubernetes node template using the Packer Builder for VMware vSphere (vsphere-iso).
*/

//  BLOCK: packer
//  The Packer configuration.

packer {
  required_version = ">= 1.8.2"
  required_plugins {
    vsphere     = {
      version   = ">= 1.0.8"
      source    = "github.com/hashicorp/vsphere"
    }
    sshkey      = {
      version   = ">= 1.0.3"
      source    = "github.com/ivoronin/sshkey"
    }
  }
}

//  BLOCK: locals
//  Defines the local variables.
data "sshkey" "install" {
}

locals {
  ssh_public_key        = data.sshkey.install.public_key
  ssh_private_key_file  = data.sshkey.install.private_key_path
  build_tool            = "HashiCorp Packer ${packer.version}"
  build_date            = formatdate("YYYY-MM-DD hh:mm ZZZ", timestamp())
  build_description     = "Kubernetes Ubuntu 20.04 Node template\nBuild date: ${local.build_date}\nBuild tool: ${local.build_tool}"
  shutdown_command      = "sudo -S -E shutdown -P now"
  iso_paths             = ["[${var.common_iso_datastore}] ${var.iso_path}/${var.iso_file}"]
  iso_checksum          = "${var.iso_checksum_type}:${var.iso_checksum_value}"
  data_source_content   = {
    "/meta-data"            = file("data/meta-data")
    "/user-data"            = templatefile("data/user-data.pkrtpl.hcl", {
      build_username        = var.build_username
      build_password        = bcrypt(var.build_password)
      build_key             = var.build_key
      vm_guest_os_language  = var.vm_guest_os_language
      vm_guest_os_keyboard  = var.vm_guest_os_keyboard
      vm_guest_os_timezone  = var.vm_guest_os_timezone
      vm_guest_os_hostname  = var.vm_name
      apt_mirror            = var.cloud_init_apt_mirror
      apt_packages          = var.cloud_init_apt_packages
    })
  }
}

//  BLOCK: source
//  Defines the builder configuration blocks.

source "vsphere-iso" "ubuntu-k8s" {

  // vCenter Server Endpoint Settings and Credentials
  vcenter_server        = var.vsphere_endpoint
  username              = var.vsphere_username
  password              = var.vsphere_password
  insecure_connection   = var.vsphere_insecure_connection

  // vSphere Settings
  datacenter    = var.vsphere_datacenter
  cluster       = var.vsphere_cluster
  datastore     = var.vsphere_datastore
  folder        = var.vsphere_folder

  // Virtual Machine Settings
  vm_name                   = var.vm_name
  vm_version                = var.common_vm_version
  guest_os_type             = var.vm_guest_os_type
  firmware                  = var.vm_firmware
  CPUs                      = var.vm_cpu_count
  cpu_cores                 = var.vm_cpu_cores
  CPU_hot_plug              = var.vm_cpu_hot_add
  RAM                       = var.vm_mem_size
  RAM_hot_plug              = var.vm_mem_hot_add
  cdrom_type                = var.vm_cdrom_type
  remove_cdrom              = var.common_remove_cdrom
  disk_controller_type      = var.vm_disk_controller_type
  storage {
    disk_size               = var.vm_disk_size
    disk_thin_provisioned   = var.vm_disk_thin_provisioned
  }
  network_adapters {
    network                 = var.vsphere_network
    network_card            = var.vm_network_card
  }
  tools_upgrade_policy      = var.common_tools_upgrade_policy
  notes                     = local.build_description
  configuration_parameters  = {
    "devices.hotplug"       = "FALSE"
  }

  // Removable Media Settings
  iso_url                   = var.iso_url
  iso_paths                 = local.iso_paths
  iso_checksum              = local.iso_checksum
  cd_content                = local.data_source_content
  cd_label                  = var.cd_label

  // Boot and Provisioning Settings 
  boot_order        = var.vm_boot_order
  boot_wait         = var.vm_boot_wait
  boot_command      = var.vm_boot_command
  ip_wait_timeout   = var.common_ip_wait_timeout
  shutdown_command  = local.shutdown_command
  shutdown_timeout  = var.common_shutdown_timeout

  // Communicator Settings and Credentials
  communicator              = "ssh"
  ssh_username              = var.build_username
  ssh_password              = var.build_password
  ssh_private_key_file      = local.ssh_private_key_file
  ssh_clear_authorized_keys = var.build_remove_keys
  ssh_port                  = var.communicator_port
  ssh_timeout               = var.communicator_timeout

  // Snapshot Settings
  create_snapshot   = var.common_snapshot_creation
  snapshot_name     = var.common_snapshot_name

  // Template and Content Library Settings
  convert_to_template   = var.common_template_conversion
  dynamic "content_library_destination" {
    for_each            = var.common_content_library_name != null ? [1] : []
    content {
      library           = var.common_content_library_name
      description       = local.build_description
      ovf               = var.common_content_library_ovf
      destroy           = var.common_content_library_destroy
      skip_import       = var.common_content_library_skip_export
    }
  }

  // OVF Export Settings
  dynamic "export" {
    for_each            = var.common_ovf_export_enabled == true ? [1] : []
    content {     
      name              = var.vm_name
      force             = var.common_ovf_export_overwrite
      options           = [
        "extraconfig"
      ]
      output_directory  = "${var.common_ovf_export_path}/${var.vm_name}"
    }
  }
}

//  BLOCK: build
//  Defines the builders to run, provisioners, and post-processors.

build {
  sources = [
    "source.vsphere-iso.ubuntu-k8s"
  ]

  provisioner "file" {
    source      = "certs"
    destination = "/tmp"
  }

  provisioner "file" {
    source      = "packer_cache/ssh_private_key_packer.pem"
    destination = "/home/${var.build_username}/.ssh/id_ed25519"
  }

  provisioner "shell" {
    execute_command     = "export KUBEVERSION=${var.k8s_version}; bash {{ .Path }}"
    expect_disconnect   = true
    environment_vars    = [
      "KUBEVERSION=${var.k8s_version}"
    ]
    scripts             = var.post_install_scripts
  }

  provisioner "shell" {
    execute_command     = "bash {{ .Path }}"
    scripts             = var.pre_final_scripts
  }
}