feat: cleanup code and introduce custom labels

flatcar.pkr.hcl

@@ -2,7 +2,7 @@ packer {
   required_plugins {
     hcloud = {
       source  = "github.com/hetznercloud/hcloud"
-      version = "~> 1"
+      version = "~> 1.4.0"
     }
   }
 }
@@ -26,65 +26,87 @@ variable "channel" {
   default = "beta"
 }
 
-variable "image_version_id" {
+variable "version" {
   type    = string
   default = "current"
 }
 
-variable "flatcar_install_script" {
-  type    = string
-  default = "https://raw.githubusercontent.com/flatcar/init/flatcar-master/bin/flatcar-install"
+variable "labels" {
+  // Available replacements:
+  // $architecture
+  // $board
+  // $channel
+  // $version - if "current" was specified, this is resolved to the actual version
+  type = map(string)
+  default = {
+    os              = "flatcar"
+    flatcar-channel = "$channel"
+    flatcar-board   = "$board"
+    version         = "$version"
+    architecture    = "$architecture"
+  }
 }
 
 locals {
-  hcloud_location   = "fsn1"
-  hcloud_rescue     = "linux64"
-  hcloud_initial_os = "ubuntu-22.04"
-  flatcar_oem_id    = "hetzner"
-
-  board = {
+  boards = {
     x86 = "amd64-usr"
     arm = "arm64-usr"
   }
+
+  architectures = ["x86", "arm"]
+
+  // If the user wants the "current" version, we still want to make the
+  // actual version id available through labels + snapshot description
+  //
+  // regex matches: FLATCAR_VERSION=1234.0.0
+  version = regex("FLATCAR_VERSION=(\\d+\\.\\d+\\.\\d+)", data.http.version_info.body)[0]
+}
+
+data "http" "version_info" {
+  // We assume that both boards have the same version
+  url = "https://${var.channel}.release.flatcar-linux.net/amd64-usr/${var.version}/version.txt"
 }
 
 source "hcloud" "flatcar" {
   token = var.hcloud_token
 
-  image    = local.hcloud_initial_os
-  location = local.hcloud_location
-  rescue   = local.hcloud_rescue
-
-  snapshot_labels = {
-    os = "flatcar"
-  }
+  image    = "ubuntu-22.04"
+  location = "fsn1"
+  rescue   = "linux64"
 
   ssh_username = "root"
 }
 
 
 build {
-  source "hcloud.flatcar" {
-    name          = "x86"
-    server_type   = var.hcloud_server_type["x86"]
-    snapshot_name = "flatcar-x86"
-  }
+  dynamic "source" {
+    for_each = local.architectures
+    labels   = ["hcloud.flatcar"]
 
-  source "hcloud.flatcar" {
-    name          = "arm"
-    server_type   = var.hcloud_server_type["arm"]
-    snapshot_name = "flatcar-arm"
+    content {
+      name          = source.value
+      server_type   = var.hcloud_server_type[source.value]
+      snapshot_name = "flatcar-${var.channel}-${local.version}-${source.value}"
+
+      snapshot_labels = {
+        for k, v in var.labels : k => replace(replace(replace(replace(v,
+          "$channel", var.channel),
+          "$version", local.version),
+          "$architecture", source.value),
+          "$board", local.boards[source.name])
+      }
+    }
   }
 
   provisioner "shell" {
     inline = [
       # Download script and dependencies
       "apt-get -y install gawk",
-      "curl -fsSLO --retry-delay 1 --retry 60 --retry-connrefused --retry-max-time 60 --connect-timeout 20 ${var.flatcar_install_script}",
+      "curl -fsSLO --retry-delay 1 --retry 60 --retry-connrefused --retry-max-time 60 --connect-timeout 20 https://raw.githubusercontent.com/flatcar/init/flatcar-master/bin/flatcar-install",
       "chmod +x flatcar-install",
 
       # Install flatcar
-      "./flatcar-install -v -s -o hetzner -b https://${var.channel}.release.flatcar-linux.net/${local.board[source.name]} -V ${var.image_version_id}",
+      "./flatcar-install -s -o hetzner -C ${var.channel} -B ${local.boards[source.name]} -V ${var.version} ",
     ]
   }
 }