template the sources.list

roles/bullseye-upgrade/tasks/main.yml

@@ -4,6 +4,11 @@
 - name: Preliminary package upgrade
   apt: upgrade=dist
 
+- name: Ensure apt sources are set to Bullseye
+  template:
+    src: sources.list
+    dest: /etc/apt/sources.list
+
 - name: Check for additional apt sources
   find:
     paths: /etc/apt/sources.list.d
@@ -11,9 +16,6 @@
     patterns: '*.list'
   register: findoutput
 
-- name: Ensure apt sources are set to Bullseye
-  shell: sed -i 's/buster/bullseye/' /etc/apt/sources.list
-
 - name: Ensure extra apt sources are set to Bullseye
   shell: sed -i 's/buster/bullseye/' /etc/apt/sources.list.d/*
   when: findoutput.examined != 0

roles/bullseye-upgrade/templates/sources.list

+# main repos
+deb http://deb.debian.org/debian/ bullseye main
+deb-src http://deb.debian.org/debian/ bullseye main
+
+# security updates
+deb http://security.debian.org/debian-security bullseye-security/updates main
+deb-src http://security.debian.org/debian-security bullseye-security/updates main
+
+# bullseye-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ bullseye-updates main
+deb-src http://deb.debian.org/debian/ bullseye-updates main