Add packer stuff

README.md

@@ -24,6 +24,15 @@ it is necessary to run the following once:
 
 Note that some roles already run this automatically.
 
+##### Note about packer
+
+We use packer to build snapshots on hcloud to use as server base images.
+In order to use this, you need to install packer and then run
+
+	packer build -var $(./packer/get_hetzner_cloud_api_key.sh) packer/archlinux.json
+
+This will take some time after which a new snapshot will have been created on the primary hcloud archlinux project.
+
 ##### Note about opendkim
 
 The opendkim DNS data has to be added to DNS manually. The roles verifies that the DNS is correct before starting opendkim.

host_vars/packer-base-image

+---
+hostname: "archlinux-packer"
+
+dhcp: true
+network_interface: "en*"
+filesystem: btrfs
+system_disks:
+  - /dev/sda
+
+ansible_python_interpreter: /usr/bin/python3

misc/hetzner-password.vault

 $ANSIBLE_VAULT;1.1;AES256
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packer/archlinux.json

+{
+    "variables": {
+        "hetzner_cloud_api_key": null
+    },
+    "sensitive-variables": ["hetzner_cloud_api_key"],
+    "builders": [{
+        "type": "hcloud",
+        "snapshot_name": "archlinux-{{ isotime \"2006-01-02T15:04\" }}",
+        "token": "{{ user `hetzner_cloud_api_key` }}",
+        "image": "ubuntu-18.04",
+        "server_type": "cx11",
+        "ssh_username": "root",
+        "location": "nbg1",
+        "rescue": "linux64"
+    }],
+    "provisioners": [{
+        "type": "ansible",
+        "playbook_file": "playbooks/tasks/install_arch.yml",
+        "host_alias": "packer-base-image",
+        "inventory_directory": "."
+    }]
+}

packer/get_hetzner_cloud_api_key.sh

+#!/bin/bash
+
+echo "hetzner_cloud_api_key=$(ansible-vault view misc/hetzner-password.vault | grep hetzner_cloud_api_key | cut -f2 -d' ')"