Add ubuntu-2404 example

- Uses new cd_files functionality to pass in autoinstall user-data, as
  Ubuntu 24.04 blocks for 5 minutes on first boot if a floppy is used
- Installs xen-guest-agent from APT as older xe-guest-utilities didn't
  seem to work on Ubuntu 24.04
- Waits for cloud-init to complete after first reboot before this plugin
  shuts down the VM to create the template

examples/http/ubuntu-2404/user-data

@@ -0,0 +1,49 @@
+#cloud-config
+autoinstall:
+  version: 1
+  identity:
+    hostname: ubuntu-server
+    # This is the crypted pass of 'ubuntu'
+    password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0"
+    username: testuser
+  ssh:
+    install-server: true
+    allow-pw: true
+
+  packages:
+    - apt-transport-https
+    - ca-certificates
+    - curl
+    - software-properties-common
+  package_upgrade: false
+
+  # late-commands are run at the very end of the *installer*, before the first
+  # reboot. However users are actually created by cloud-init after the first
+  # reboot. So these commands can't affect anything that requires a user to
+  # actually exist.
+  late-commands:
+    # Add xen-guest-agent - this is impossible (!) on Ubuntu 24.04 using
+    # the normal apt/packages autoinstall configuration, because (a) the
+    # xen-guest-agent apt repository does not use the "components" field
+    # (odd, but legal); (b) curtin's apt-config process hard requires
+    # deb822 .sources to have a "Components:" key, and (c) even if we
+    # try to configure it with a .list entry rather than .source entry
+    # under "apt:", on Ubuntu 24 curtin force-converts "deb" lines to
+    # deb822 format. I wasted days on this. Have to just do it the
+    # old-fashioned way here.
+    - 'echo "deb [trusted=yes] https://gitlab.com/api/v4/projects/xen-project%252Fxen-guest-agent/packages/generic/deb-amd64/ release/" > /target/etc/apt/sources.list.d/xen.list'
+    - curtin in-target --target /target -- apt-get update
+    - curtin in-target --target /target -- apt-get install -y xen-guest-agent
+
+    # If you want to do anything custom with files from "cd_files",
+    # uncomment these lines
+    #- mount /dev/sr1 /mnt
+    #- cp /mnt/my-cool.conf /target/etc/path/cool.conf
+    #- umount /mnt
+
+  # User-data is passed to the "real" cloud-init, which runs after the first
+  # reboot after the installer has finished. So you can run commands which
+  # modify users here, such as added 'testuser' to a new group.
+  #user-data:
+  #  runcmd:
+  #    - [ 'usermod', '-a', '-G', 'backup', 'testuser' ]

examples/ubuntu/ubuntu-2404.pkr.hcl

@@ -0,0 +1,125 @@
+packer {
+  required_plugins {
+   xenserver= {
+      version = ">= v0.6.0"
+      source = "github.com/ddelnano/xenserver"
+    }
+  }
+}
+
+# The ubuntu_version value determines what Ubuntu iso URL and sha256 hash we lookup. Updating
+# this will allow a new version to be pulled in.
+data "null" "ubuntu_version" {
+  input = "24.04"
+}
+
+locals {
+  timestamp = regex_replace(timestamp(), "[- TZ:]", "")
+  ubuntu_version = data.null.ubuntu_version.output
+
+  # Update this map depending on what templates are available on your Xen server.
+  ubuntu_template_name = {
+    24.04 = "Ubuntu Focal Fossa 20.04"
+  }
+}
+
+# TODO(ddelnano): Update this to use a local once https://github.com/hashicorp/packer/issues/11011
+# is fixed.
+data "http" "ubuntu_sha_and_release" {
+  url = "https://releases.ubuntu.com/${data.null.ubuntu_version.output}/SHA256SUMS"
+}
+
+local "ubuntu_sha256" {
+  expression = regex("([A-Za-z0-9]+)[\\s\\*]+ubuntu-.*server", data.http.ubuntu_sha_and_release.body)
+}
+
+variable "remote_host" {
+  type        = string
+  description = "The ip or fqdn of your XenServer. This will be pulled from the env var 'PKR_VAR_remote_host'"
+  sensitive   = true
+  default     = null
+}
+
+variable "remote_password" {
+  type        = string
+  description = "The password used to interact with your XenServer. This will be pulled from the env var 'PKR_VAR_remote_password'"
+  sensitive   = true
+  default     = null
+}
+
+variable "remote_username" {
+  type        = string
+  description = "The username used to interact with your XenServer. This will be pulled from the env var 'PKR_VAR_remote_username'"
+  sensitive   = true
+  default     = null
+}
+
+variable "sr_iso_name" {
+  type        = string
+  description = "The name of the SR packer will use to store the installation ISO"
+  default     = ""
+}
+
+variable "sr_name" {
+  type        = string
+  description = "The name of the SR packer will use to create the VM"
+  default     = ""
+}
+
+source "xenserver-iso" "ubuntu-2404" {
+  iso_checksum    = "sha256:${local.ubuntu_sha256.0}"
+  iso_url         = "https://releases.ubuntu.com/${local.ubuntu_version}/ubuntu-${local.ubuntu_version}-live-server-amd64.iso"
+
+  sr_name         = var.sr_name
+  sr_iso_name     = var.sr_iso_name
+  remote_host     = var.remote_host
+  remote_password = var.remote_password
+  remote_username = var.remote_username
+
+  clone_template  = local.ubuntu_template_name[data.null.ubuntu_version.output]
+  vm_name         = "ubuntu-${data.null.ubuntu_version.output}-gold"
+  vm_description  = "Built at ${local.timestamp}"
+  vm_memory       = 8192
+  disk_size       = 10240
+  vcpus_max       = 4
+  vcpus_atstartup = 4
+
+  boot_command =  [
+    "c<wait5>",
+    "set gfxpayload=keep<enter>",
+    "linux /casper/vmlinuz autoinstall ---<enter>",
+    "initrd /casper/initrd<enter>",
+    "boot<enter>"
+  ]
+  cd_files = [
+    "examples/http/ubuntu-2404/meta-data",
+    "examples/http/ubuntu-2404/user-data"
+  ]
+
+  # The xenserver plugin needs to SSH in to the new VM, so we give it
+  # the information to do so
+  ssh_username            = "testuser"
+  ssh_password            = "ubuntu"
+  ssh_wait_timeout        = "60000s"
+  ssh_handshake_attempts  = 10000
+
+
+  output_directory = null
+  keep_vm          = "always"
+}
+
+build {
+  sources = ["xenserver-iso.ubuntu-2404"]
+
+  # Things to do on the new VM once it's past first reboot:
+
+  # Wait for cloud-init to finish everything. We need to do this as a
+  # packer provisioner to prevent packer-plugin-xenserver from shutting
+  # the VM down before all cloud-init processing is complete.
+  provisioner "shell" {
+    inline = [
+      "echo ubuntu | sudo -S cloud-init status --wait"
+    ]
+    valid_exit_codes = [0, 2]
+  }
+}