Fedora CoreOS support (#5657)

* fedora coreos support
- bootstrap and new fact for

* fedora coreos support
- fix bootstrap condition

* fedora coreos support
- allow customize packages for fedora coreos bootstrap

* fedora coreos support
- prevent install ptyhon3 and epel via dnf for fedora coreos

* fedora coreos support
- handle all ostree like os in same way

* fedora coreos support
- handle all ostree like os in same way for crio

* fedora coreos support
- add fcos documentations

roles/kubernetes/preinstall/meta/main.yml

@@ -2,6 +2,8 @@
 dependencies:
   - role: adduser
     user: "{{ addusers.kube }}"
-    when: not is_atomic
+    when:
+      - not is_atomic
+      - not is_fedora_coreos
     tags:
-      - kubelet
+      - kubelet

roles/kubernetes/preinstall/tasks/0040-set_facts.yml

@@ -27,9 +27,21 @@
     path: /run/ostree-booted
   register: ostree
 
+- name: set is_fedora_coreos
+  lineinfile:
+    path: /etc/os-release
+    line: "VARIANT_ID=coreos"
+    state: present
+  check_mode: yes
+  register: os_variant_coreos
+
+- name: set is_fedora_coreos
+  set_fact:
+    is_fedora_coreos: "{{ ostree.stat.exists and os_variant_coreos is not changed }}"
+
 - name: set is_atomic
   set_fact:
-    is_atomic: "{{ ostree.stat.exists }}"
+    is_atomic: "{{ ostree.stat.exists and not is_fedora_coreos }}"
 
 - name: set kube_cert_group on atomic hosts
   set_fact:

roles/kubernetes/preinstall/tasks/0070-system-packages.yml

@@ -24,6 +24,7 @@
   when:
     - ansible_distribution in ["CentOS","RedHat","OracleLinux"]
     - not is_atomic
+    - not is_fedora_coreos
 
 - name: Install python-dnf for latest RedHat versions
   command: dnf install -y python-dnf yum
@@ -36,6 +37,7 @@
     - ansible_distribution_major_version|int > 21
     - ansible_distribution_major_version|int <= 29
     - not is_atomic
+    - not is_fedora_coreos
   changed_when: False
   tags:
     - bootstrap-os
@@ -50,6 +52,7 @@
     - ansible_distribution == "Fedora"
     - ansible_distribution_major_version|int >= 30
     - not is_atomic
+    - not is_fedora_coreos
   changed_when: False
   tags:
     - bootstrap-os
@@ -61,6 +64,7 @@
   when:
     - ansible_distribution in ["CentOS","RedHat"]
     - not is_atomic
+    - not is_fedora_coreos
     - epel_enabled|bool
   tags:
     - bootstrap-os
@@ -79,7 +83,7 @@
   until: pkgs_task_result is succeeded
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
-  when: not (ansible_os_family in ["CoreOS", "Coreos", "Container Linux by CoreOS", "Flatcar", "Flatcar Container Linux by Kinvolk", "ClearLinux"] or is_atomic)
+  when: not (ansible_os_family in ["CoreOS", "Coreos", "Container Linux by CoreOS", "Flatcar", "Flatcar Container Linux by Kinvolk", "ClearLinux"] or is_atomic or is_fedora_coreos)
   tags:
     - bootstrap-os