add support for file share

files/cloud_init.cfg.tftpl

@@ -3,9 +3,11 @@ hostname: "${name}"
 manage_etc_hosts: true
 disable_root: false
 ssh_authorized_keys:
+
 %{ for key in admin_authorized_keys ~}
   - "${key}"
 %{ endfor ~}
+
 %{ if insecure_password }
 chpasswd:
   list: |
@@ -15,12 +17,14 @@ ssh_pwauth: true
 %{ else }
 ssh_pwauth: false
 %{ endif }
+
 %{ if use_host_cert }
 ssh_keys:
   ed25519_private: |
     ${indent(4, private_key)}
   ed25519_certificate: "${host_cert}"
 %{ endif}
+
 write_files:
 - path: /etc/default/locale
   content: |
@@ -29,10 +33,12 @@ write_files:
 - path: /etc/locale.gen
   content: |
     en_US.UTF-8 UTF-8
+
 runcmd:
 - dhclient -r
 - dhclient
 - locale-gen
+
 %{ if data_disk }
 device_aliases:
   data: /dev/vdb
@@ -46,9 +52,18 @@ fs_setup:
     filesystem: 'ext4'
     device: data.1
     overwrite: false
+%{ endif }
+
+%{ if data_disk || add_data_share }
 mounts:
+%{ if data_disk }
 - ["data.1", "/mnt/data"]
 %{ endif }
+%{ if add_data_share }
+- ["data", "/mnt/data", "9p", "trans=virtio", "0", "0"]
+%{ endif }
+%{ endif }
+
 %{ if fixed_dns != "" }
 manage_resolv_conf: true
 resolv_conf:

main.tf

@@ -16,6 +16,7 @@ locals {
     private_key           = tls_private_key.debian.private_key_openssh,
     data_disk             = var.data_disk != null
     fixed_dns             = var.fixed_dns
+    add_data_share        = var.add_data_share
   })
   cloudinit_network_config = templatefile("${path.module}/files/network_config.cfg.tftpl", {
     fixed_address = var.fixed_address
@@ -93,11 +94,22 @@ resource "libvirt_domain" "debian" {
 
   dynamic "disk" {
     for_each = var.data_disk != null ? [1] : []
+
     content {
       volume_id = var.data_disk
     }
   }
 
+  dynamic "filesystem" {
+    for_each = var.add_data_share ? [1] : []
+
+    content {
+      source   = "/data/${local.domain_name}/"
+      target   = "data"
+      readonly = false
+    }
+  }
+
   network_interface {
     bridge   = var.bridge_name
     hostname = var.name

variables.tf

@@ -106,3 +106,9 @@ variable "fixed_dns" {
   default     = ""
   description = "Fixed DNS server the machine should have."
 }
+
+variable "add_data_share" {
+  type        = bool
+  default     = true
+  description = "Whether to share /data with the guest OS."
+}