feat(proxmox): add ability to add a cloud-init drive

builder/proxmox/config.go

@@ -58,6 +58,9 @@ type Config struct {
 	TemplateDescription string `mapstructure:"template_description"`
 	UnmountISO          bool   `mapstructure:"unmount_iso"`
 
+	CloudInit            bool   `mapstructure:"cloud_init"`
+	CloudInitStoragePool string `mapstructure:"cloud_init_storage_pool"`
+
 	shouldUploadISO bool
 
 	ctx interpolate.Context
@@ -85,6 +88,8 @@ type vgaConfig struct {
 func (c *Config) Prepare(raws ...interface{}) ([]string, error) {
 	// Agent defaults to true
 	c.Agent = true
+	// Do not add a cloud-init cdrom by default
+	c.CloudInit = false
 
 	var md mapstructure.Metadata
 	err := config.Decode(c, &config.DecodeOpts{

builder/proxmox/config.hcl2spec.go

@@ -95,6 +95,8 @@ type FlatConfig struct {
 	TemplateName              *string           `mapstructure:"template_name" cty:"template_name"`
 	TemplateDescription       *string           `mapstructure:"template_description" cty:"template_description"`
 	UnmountISO                *bool             `mapstructure:"unmount_iso" cty:"unmount_iso"`
+	CloudInit                 *bool             `mapstructure:"cloud_init" cty:"cloud_init"`
+	CloudInitStoragePool      *string           `mapstructure:"cloud_init_storage_pool" cty:"cloud_init_storage_pool"`
 }
 
 // FlatMapstructure returns a new FlatConfig.
@@ -195,6 +197,8 @@ func (*FlatConfig) HCL2Spec() map[string]hcldec.Spec {
 		"template_name":                &hcldec.AttrSpec{Name: "template_name", Type: cty.String, Required: false},
 		"template_description":         &hcldec.AttrSpec{Name: "template_description", Type: cty.String, Required: false},
 		"unmount_iso":                  &hcldec.AttrSpec{Name: "unmount_iso", Type: cty.Bool, Required: false},
+		"cloud_init":                   &hcldec.AttrSpec{Name: "cloud_init", Type: cty.Bool, Required: false},
+		"cloud_init_storage_pool":      &hcldec.AttrSpec{Name: "cloud_init_storage_pool", Type: cty.String, Required: false},
 	}
 	return s
 }

builder/proxmox/config_test.go

@@ -125,6 +125,9 @@ func TestBasicExampleFromDocsIsValid(t *testing.T) {
 	if b.config.SCSIController != "lsi" {
 		t.Errorf("Expected SCSI controller to be 'lsi', got %s", b.config.SCSIController)
 	}
+	if b.config.CloudInit != false {
+		t.Errorf("Expected CloudInit to be false, got %t", b.config.CloudInit)
+	}
 }
 
 func TestAgentSetToFalse(t *testing.T) {

builder/proxmox/step_finalize_template_config.go

@@ -56,6 +56,43 @@ func (s *stepFinalizeTemplateConfig) Run(ctx context.Context, state multistep.St
 		changes["ide2"] = "none,media=cdrom"
 	}
 
+	if c.CloudInit {
+		vmParams, err := client.GetVmConfig(vmRef)
+		if err != nil {
+			err := fmt.Errorf("Error fetching template config: %s", err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+
+		cloudInitStoragePool := c.CloudInitStoragePool
+		if cloudInitStoragePool == "" {
+			if vmParams["bootdisk"] != nil && vmParams[vmParams["bootdisk"].(string)] != nil {
+				bootDisk := vmParams[vmParams["bootdisk"].(string)].(string)
+				cloudInitStoragePool = strings.Split(bootDisk, ":")[0]
+			}
+		}
+		if cloudInitStoragePool != "" {
+			ideControllers := []string{"ide3", "ide2", "ide1", "ide0"}
+			cloudInitAttached := false
+			// find a free ide controller
+			for _, controller := range ideControllers {
+				if vmParams[controller] == nil {
+					ui.Say("Adding a cloud-init cdrom in storage pool " + cloudInitStoragePool)
+					changes[controller] = cloudInitStoragePool + ":cloudinit"
+					cloudInitAttached = true
+					break
+				}
+			}
+			if cloudInitAttached == false {
+				err := fmt.Errorf("Found no free ide controller for a cloud-init cdrom")
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return multistep.ActionHalt
+			}
+		}
+	}
+
 	if len(changes) > 0 {
 		_, err := client.SetVmConfig(vmRef, changes)
 		if err != nil {

builder/proxmox/step_finalize_template_config_test.go

@@ -71,6 +71,51 @@ func TestTemplateFinalize(t *testing.T) {
 			},
 			expectedAction: multistep.ActionContinue,
 		},
+		{
+			name: "all options with cloud-init",
+			builderConfig: &Config{
+				TemplateName:        "my-template",
+				TemplateDescription: "some-description",
+				UnmountISO:          true,
+				CloudInit:           true,
+			},
+			initialVMConfig: map[string]interface{}{
+				"name":        "dummy",
+				"description": "Packer ephemeral build VM",
+				"ide2":        "local:iso/Fedora-Server-dvd-x86_64-29-1.2.iso,media=cdrom",
+				"bootdisk":    "virtio0",
+				"virtio0":     "ceph01:base-223-disk-0,cache=unsafe,media=disk,size=32G",
+			},
+			expectCallSetConfig: true,
+			expectedVMConfig: map[string]interface{}{
+				"name":        "my-template",
+				"description": "some-description",
+				"ide2":        "none,media=cdrom",
+				"ide3":        "ceph01:cloudinit",
+			},
+			expectedAction: multistep.ActionContinue,
+		},
+		{
+			name: "no available controller for cloud-init drive",
+			builderConfig: &Config{
+				TemplateName:        "my-template",
+				TemplateDescription: "some-description",
+				UnmountISO:          false,
+				CloudInit:           true,
+			},
+			initialVMConfig: map[string]interface{}{
+				"name":        "dummy",
+				"description": "Packer ephemeral build VM",
+				"ide0":        "local:iso/Fedora-Server-dvd-x86_64-29-1.2.iso,media=cdrom",
+				"ide1":        "local:iso/Fedora-Server-dvd-x86_64-29-1.2.iso,media=cdrom",
+				"ide2":        "local:iso/Fedora-Server-dvd-x86_64-29-1.2.iso,media=cdrom",
+				"ide3":        "local:iso/Fedora-Server-dvd-x86_64-29-1.2.iso,media=cdrom",
+				"bootdisk":    "virtio0",
+				"virtio0":     "ceph01:base-223-disk-0,cache=unsafe,media=disk,size=32G",
+			},
+			expectCallSetConfig: false,
+			expectedAction:      multistep.ActionHalt,
+		},
 		{
 			name: "no cd-drive with unmount=true should returns halt",
 			builderConfig: &Config{

website/pages/docs/builders/proxmox.mdx

@@ -193,6 +193,11 @@ builder.
   `lsi53c810`, `virtio-scsi-pci`, `virtio-scsi-single`, `megasas`, or `pvscsi`.
   Defaults to `lsi`.
 
+- `cloud_init` (bool) - If true, add a Cloud-Init CDROM drive after the virtual machine has been converted to a template.
+
+- `cloud_init_storage_pool` - (string) - Name of the Proxmox storage pool
+    to store the Cloud-Init CDROM on. If not given, the storage pool of the boot device will be used.
+
 ## Example: Fedora with kickstart
 
 Here is a basic example creating a Fedora 29 server image with a Kickstart