From 4622240c6c6e24155b22eee70adbadb7919c3707 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Thu, 17 Mar 2022 15:14:49 -0500
Subject: [PATCH] r/netboot/jenkins-agent: Configure NBD exports

The *netboot/jenkins-agent* Ansible role configures three NBD exports:

* A single, shared, read-only export containing the Jenkins agent root
  filesystem, as a SquashFS filesystem
* For each defined agent host, a writable data volume for Jenkins
  workspaces
* For each defined agent host, a writable data volume for Docker

Agent hosts must have some kind of unique value to identify their
persistent data volumes.  Raspberry Pi devices, for example, can use the
SoC serial number.
---
 group_vars/pxe/jenkins-agent.yml                   |  2 ++
 roles/netboot/jenkins-agent/tasks/main.yml         |  7 +++++++
 .../jenkins-agent/templates/jenkins-agent.ini.j2   | 14 ++++++++++++++
 3 files changed, 23 insertions(+)
 create mode 100644 group_vars/pxe/jenkins-agent.yml
 create mode 100644 roles/netboot/jenkins-agent/tasks/main.yml
 create mode 100644 roles/netboot/jenkins-agent/templates/jenkins-agent.ini.j2

diff --git a/group_vars/pxe/jenkins-agent.yml b/group_vars/pxe/jenkins-agent.yml
new file mode 100644
index 0000000..b47f1f7
--- /dev/null
+++ b/group_vars/pxe/jenkins-agent.yml
@@ -0,0 +1,2 @@
+netboot_jenkins_agents:
+- ba5bebc5
diff --git a/roles/netboot/jenkins-agent/tasks/main.yml b/roles/netboot/jenkins-agent/tasks/main.yml
new file mode 100644
index 0000000..1960434
--- /dev/null
+++ b/roles/netboot/jenkins-agent/tasks/main.yml
@@ -0,0 +1,7 @@
+- name: ensure jenkins-agent nbd export is configured
+  template:
+    src: jenkins-agent.ini.j2
+    dest: /etc/nbd-server/config.d/jenkins-agent.conf
+    mode: u=rw,go=r
+  tags:
+  - nbd-config
diff --git a/roles/netboot/jenkins-agent/templates/jenkins-agent.ini.j2 b/roles/netboot/jenkins-agent/templates/jenkins-agent.ini.j2
new file mode 100644
index 0000000..7530d90
--- /dev/null
+++ b/roles/netboot/jenkins-agent/templates/jenkins-agent.ini.j2
@@ -0,0 +1,14 @@
+[jenkinsagent-aarch64]
+exportname = /var/lib/nbd/jenkinsagent-aarch64.squashfs
+readonly = true
+
+{% for name in netboot_jenkins_agents %}
+[docker-{{ name }}]
+exportname = /var/lib/nbd/docker-{{ name }}.img
+filesize = 10737418240
+
+[jenkins-ba5bebc5]
+exportname = /var/lib/nbd/jenkins-{{ name }}.img
+filesize = 10737418240
+#force_tls = true
+{% endfor %}