automatically modify nfs configuration depending on home volume

Author: sjpb

docs/production.md

@@ -106,6 +106,8 @@ and referenced from the `site` and `production` environments, e.g.:
   by a parallel filesystem (e.g. manila) use
 
       home_volume_provisioning = "none"
+
+  In this case the NFS share for home directories is automatically disabled.
   
 - Enable `etc_hosts` templating:
 

environments/common/inventory/group_vars/all/nfs.yml

@@ -11,7 +11,7 @@ _nfs_node_ips: "{{ groups['nfs'] | map('extract', hostvars, 'ansible_host') | jo
 # default *all* entries in nfs_configurations to only permitting mounts from above IPs:
 nfs_export_clients: "{{ _nfs_node_ips }}"
 
-nfs_configurations:
+nfs_configuration_home_volume: # volume-backed home directories
   - comment: Export /exports/home from Slurm control node as /home
     nfs_enable:
         server:  "{{ inventory_hostname in groups['control'] }}"
@@ -25,8 +25,20 @@ nfs_configurations:
     # accidently overriden via default options
     nfs_export_options: 'rw,secure,root_squash'
 
+nfs_configuration_compute_nodes: # cluster configuration for compute_init/slurm-controlled rebuild
   - comment: Export /exports/cluster from Slurm control node
     nfs_enable:
         server: "{{ inventory_hostname in groups['control'] }}"
         clients: false
     nfs_export: "/exports/cluster"
+
+nfs_configurations_extra: [] # site-specific nfs shares
+
+nfs_configurations: >- # construct stackhpc.nfs variable
+  {{
+    nfs_configuration_home_volume if (cluster_home_volume | default(true)) else []
+    +
+    nfs_configuration_compute_nodes
+    +
+    nfs_configurations_extra
+  }}

environments/skeleton/{{cookiecutter.environment}}/tofu/inventory.tf

@@ -7,6 +7,7 @@ resource "local_file" "hosts" {
                             "login_groups": module.login
                             "compute_groups": module.compute
                             "state_dir": var.state_dir
+                            "cluster_home_volume": var.home_volume_provisioning != "none"
                           },
                           )
   filename = "../inventory/hosts.yml"

environments/skeleton/{{cookiecutter.environment}}/tofu/inventory.tpl

@@ -2,6 +2,7 @@ all:
     vars:
         openhpc_cluster_name: ${cluster_name}
         cluster_domain_suffix: ${cluster_domain_suffix}
+        cluster_home_volume: ${cluster_home_volume}
 
 control:
     hosts: