AB#2114 Add QEMU metadata API (#237)

* Add QEMU metadata API

* API server is started automatically when using terraform to deploy a QEMU cluster

* Enable QEMU metadata usage for disk-mapper, debugd and the Coordinator

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

terraform/libvirt/README.md

@@ -6,6 +6,7 @@ Prerequisite:
 
 - [qcow2 constellation image](/image/)
 - [setup](#setup-libvirt--terraform)
+- [qemu-metadata-api](/hack/qemu-metadata-api/README.md)
 
 Optional: Write a `terraform.tfvars` file in the terraform workspace (`terraform/libvirt`), defining required variables and overriding optional variables.
 See [variables.tf](./variables.tf) for a description of all available variables.

terraform/libvirt/main.tf

@@ -4,6 +4,10 @@ terraform {
       source  = "dmacvicar/libvirt"
       version = "0.6.14"
     }
+    docker = {
+      source = "kreuzwerker/docker"
+      version = "2.17.0"
+    }
   }
 }
 
@@ -11,6 +15,32 @@ provider "libvirt" {
   uri = "qemu:///session"
 }
 
+provider "docker" {
+  host = "unix:///var/run/docker.sock"
+
+  registry_auth {
+    address     = "ghcr.io"
+    config_file = pathexpand("~/.docker/config.json")
+  }
+}
+
+resource "docker_image" "qemu-metadata" {
+  name = "ghcr.io/edgelesssys/constellation/qemu-metadata-api:latest"
+  keep_locally = true 
+}
+
+resource "docker_container" "qemu-metadata" {
+  name = "qemu-metadata"
+  image = docker_image.qemu-metadata.latest
+  network_mode = "host"
+  rm = true
+  mounts {
+    source = "/var/run/libvirt/libvirt-sock"
+    target = "/var/run/libvirt/libvirt-sock"
+    type = "bind" 
+  }
+}
+
 module "control_plane" {
   source          = "./modules/instance_group"
   role            = "control-plane"