From e5561aef977b6d18ed06a773d04f0732efac590c Mon Sep 17 00:00:00 2001
From: Joao Fracarolli <joao.vicentinifracarolli@windriver.com>
Date: Fri, 11 Jul 2025 14:45:55 -0300
Subject: [PATCH] Copy host UUID into Nova's config dir

This patch adds some new fields in Nova's chart. The first one, 'hosts_uuids',
contains a list of hosts and its respectives UUIDs. By default, this list
is empty and is populated through system overrides.
The second one is 'manifests.compute_uuid_self_provisioning',which is used
to set self provisioning on or off. The default is 'true'.
It also adds a code in nova-compute-init.sh script to copy the current
host's UUID obtained via helm chart into the Nova's state_path
directory, in order to ensure that Nova will always use the same
UUID of the node it's running in. By doing this, we are provisioning
the UUID, accordingly to [1].

[1] https://docs.openstack.org/nova/latest/admin/compute-node-identification.html

Signed-off-by: Joao Fracarolli <joao.vicentinifracarolli@windriver.com>
---
 nova/templates/bin/_nova-compute-init.sh.tpl | 10 ++++++++++
 nova/values.yaml                             |  4 ++++
 2 files changed, 14 insertions(+)

diff --git a/nova/templates/bin/_nova-compute-init.sh.tpl b/nova/templates/bin/_nova-compute-init.sh.tpl
index 4bc71a393..5218d3707 100644
--- a/nova/templates/bin/_nova-compute-init.sh.tpl
+++ b/nova/templates/bin/_nova-compute-init.sh.tpl
@@ -16,6 +16,16 @@ limitations under the License.
 
 set -ex
 
+{{- if and .Values.hosts_uuids (not .Values.manifests.compute_uuid_self_provisioning) }}
+# Extract Host's uuid from helm chart and save it to the compute_id file
+  {{- range $host := .Values.hosts_uuids }}
+hostname="{{- $host.name}}"
+if [ "$hostname" == $HOSTNAME ]; then
+  echo "{{ $host.uuid }}" > {{ $.Values.conf.nova.DEFAULT.state_path }}/compute_id
+fi
+  {{- end }}
+{{- end }}
+
 # Make the Nova Instances Dir as this is not autocreated.
 mkdir -p /var/lib/nova/instances
 
diff --git a/nova/values.yaml b/nova/values.yaml
index 621d52b95..08288dfc5 100644
--- a/nova/values.yaml
+++ b/nova/values.yaml
@@ -2554,6 +2554,7 @@ tls:
 
 manifests:
   certificates: false
+  compute_uuid_self_provisioning: true
   configmap_bin: true
   configmap_etc: true
   cron_job_cell_setup: true
@@ -2602,4 +2603,7 @@ manifests:
   service_spiceproxy: true
   service_osapi: true
   statefulset_compute_ironic: false
+
+# List of hosts and uuids
+hosts_uuids: []
 ...
-- 
2.34.1