From e754db5fbd3fd475dfbe0869238b84ba200b7d15 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Thu, 10 Apr 2025 18:22:41 +0200
Subject: [PATCH] Consolidate hosts template

For alpine, debian, ceph and proxmox roles.

Add the union of IPv6 LL host entries across all distros to make sure nothing croaks.
---
 roles/alpine/templates/hosts.j2  |  2 --
 roles/ceph/templates/hosts.j2    | 10 ----------
 roles/proxmox/templates/hosts.j2 | 12 ------------
 templates/hosts.j2               | 15 +++++++++++++++
 4 files changed, 15 insertions(+), 24 deletions(-)
 delete mode 100644 roles/alpine/templates/hosts.j2
 delete mode 100644 roles/ceph/templates/hosts.j2
 delete mode 100644 roles/proxmox/templates/hosts.j2
 create mode 100644 templates/hosts.j2

diff --git a/roles/alpine/templates/hosts.j2 b/roles/alpine/templates/hosts.j2
deleted file mode 100644
index df67400..0000000
--- a/roles/alpine/templates/hosts.j2
+++ /dev/null
@@ -1,2 +0,0 @@
-127.0.0.1	{{ dns_name }} {{ dns_name | split('.') | first }} localhost.localdomain localhost
-::1		localhost localhost.localdomain
diff --git a/roles/ceph/templates/hosts.j2 b/roles/ceph/templates/hosts.j2
deleted file mode 100644
index 30f170b..0000000
--- a/roles/ceph/templates/hosts.j2
+++ /dev/null
@@ -1,10 +0,0 @@
-127.0.0.1 localhost
-::1 localhost ip6-localhost ip6-loopback
-ff02::1 ip6-allnodes
-ff02::2 ip6-allrouters
-
-{% for node in nodes %}
-{% for address in node|device_address %}
-{{ address.address | ipaddr('address') }} {{ node.inventory_hostname }}
-{% endfor %}
-{% endfor %}
diff --git a/roles/proxmox/templates/hosts.j2 b/roles/proxmox/templates/hosts.j2
deleted file mode 100644
index a4ac92f..0000000
--- a/roles/proxmox/templates/hosts.j2
+++ /dev/null
@@ -1,12 +0,0 @@
-127.0.0.1 localhost.localdomain localhost
-
-::1     ip6-localhost ip6-loopback
-fe00::0 ip6-localnet
-ff00::0 ip6-mcastprefix
-ff02::1 ip6-allnodes
-ff02::2 ip6-allrouters
-ff02::3 ip6-allhosts
-
-{% for address in interfaces | selectattr('name', '==', 'lo') | map(attribute='ip_addresses') | first %}
-{{ address.address | ipaddr('address') }} {{ address.dns_name }} {{ inventory_hostname }}
-{% endfor %}
diff --git a/templates/hosts.j2 b/templates/hosts.j2
new file mode 100644
index 0000000..8864201
--- /dev/null
+++ b/templates/hosts.j2
@@ -0,0 +1,15 @@
+127.0.0.1 localhost
+::1 localhost ip6-localhost ip6-loopback
+fe00::0 ip6-localnet
+ff00::0 ip6-mcastprefix
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
+ff02::3 ip6-allhosts
+
+{# Static entries for all nodes in the cluster or just this one if there is no cluster. #}
+{% for address in nodes | default([hostvars[inventory_hostname]])
+    | map(attribute='interfaces') | flatten
+    | map(attribute='ip_addresses') | flatten
+    | selectattr('dns_name') %}
+{{ address.address | ipaddr('address') }} {{ address.dns_name }} {{ address.dns_name | split('.') | first }}
+{% endfor %}