preinstall: simplify OS packages selection

Since a2019c1c (Add a JSON schema describing the packages install
structure, 2024-04-25), we use a custom structure to select which
packages should be installed on a particular host OS.

This has proven too rigid in practice, and the query is pretty
complicated.

Replace this by simply using an array of jinja conditions for the
packages, which should be easier to understand for everyone and more
flexible.

Also remove the associated schema and validation which are no longer
needed.

roles/kubernetes/preinstall/files/pkgs-schema.json

-{
-    "$schema": "https://json-schema.org/draft/2020-12/schema",
-    "$id": "https://kubespray.io/internal/os_packages.schema.json",
-    "title": "Os packages",
-    "description": "Criteria for selecting packages to install on Kubernetes nodes during installation by Kubespray",
-    "type": "object",
-    "patternProperties": {
-        ".*": {
-            "type": "object",
-            "additionalProperties": false,
-            "properties": {
-                "enabled": {
-                    "description": "Escape hatch to filter packages. The value is expected to be pre-resolved to a boolean by Jinja",
-                    "type": "boolean",
-                    "default": true
-                },
-                "groups": {
-                    "description": "Match if the host is in one of these groups. If not specified match any host.",
-                    "type": "array",
-                    "minItems": 1,
-                    "items":{
-                        "type": "string",
-                        "pattern": "^[0-9A-Za-z_]*$"
-                    }
-                },
-                "os": {
-                    "type": "object",
-                    "description": "If not specified match any OS. Otherwise, must match by 'families' or 'distributions' to be included.",
-                    "additionalProperties": false,
-                    "minProperties": 1,
-                    "properties": {
-                        "families": {
-                            "description": "Match if ansible_os_family is part of the list.",
-                            "type": "array",
-                            "minItems": 1,
-                            "items": {
-                                "type": "string"
-                            }
-                        },
-                        "distributions": {
-                            "type": "object",
-                            "description": "Match if ansible_distribution match one of defined keys.",
-                            "minProperties": 1,
-                            "patternProperties": {
-                                ".*": {
-                                    "description": "Match if either the value is the empty hash, or one major_versions/versions/releases contains the corresponding variable ('ansible_distrbution_*')",
-                                    "type": "object",
-                                    "additionalProperties": false,
-                                    "properties": {
-                                        "major_versions": {
-                                            "type": "array",
-                                            "minItems": 1,
-                                            "items": {
-                                                "type": "string"
-                                            }
-                                        },
-                                        "versions": {
-                                            "type": "array",
-                                            "minItems": 1,
-                                            "items": {
-                                                "type": "string"
-                                            }
-                                        },
-                                        "releases": {
-                                            "type": "array",
-                                            "minItems": 1,
-                                            "items": {
-                                                "type": "string"
-                                            }
-                                        }
-                                    }
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-}

roles/kubernetes/preinstall/tasks/0040-verify-settings.yml

@@ -321,11 +321,6 @@
     - kube_apiserver_enable_admission_plugins is defined
     - kube_apiserver_enable_admission_plugins | length > 0
 
-- name: Verify that the packages list structure is valid
-  ansible.utils.validate:
-    criteria: "{{ lookup('file', 'pkgs-schema.json') }}"
-    data: "{{ pkgs }}"
-
 - name: Verify that the packages list is sorted
   vars:
     pkgs_lists: "{{ pkgs.keys() | list }}"

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

@@ -60,23 +60,8 @@
     - bootstrap-os
 
 - name: Install packages requirements
-  vars:
-    # The json_query for selecting packages name is split for readability
-    # see files/pkgs-schema.json for the structure of `pkgs`
-    # and the matching semantics
-    full_query: "[? value | (enabled == null || enabled) && ( {{ filters_os }} ) && ( {{ filters_groups }} ) ].key"
-    filters_groups: "groups | @ == null || [? contains(`{{ group_names }}`, @)]"
-    filters_os: "os == null || (os | ( {{ filters_family }} ) || ( {{ filters_distro }} ))"
-    dquote: !unsafe '"'
-    # necessary to workaround Ansible escaping
-    filters_distro: "distributions.{{ dquote }}{{ ansible_distribution  }}{{ dquote }} |
-                          @ == `{}` ||
-                          contains(not_null(major_versions, `[]`), '{{ ansible_distribution_major_version }}') ||
-                          contains(not_null(versions, `[]`), '{{ ansible_distribution_version }}') ||
-                          contains(not_null(releases, `[]`), '{{ ansible_distribution_release }}')"
-    filters_family: "families && contains(families, '{{ ansible_os_family }}')"
   package:
-    name: "{{ pkgs | dict2items | to_json|from_json | community.general.json_query(full_query) }}"
+    name: "{{ pkgs | dict2items | selectattr('value', 'ansible.builtin.all') | map(attribute='key') }}"
     state: present
   register: pkgs_task_result
   until: pkgs_task_result is succeeded

roles/kubernetes/preinstall/vars/main.yml

 ---
 pkgs:
-  apparmor: &debian_family_base
-    os:
-      families:
-      - Debian
-  apt-transport-https: *debian_family_base
-  aufs-tools: &deb_10
-    groups:
-    - k8s_cluster
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "10"
-  bash-completion: {}
-  conntrack: &deb_redhat
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Debian
-      - RedHat
+  apparmor:
+    - "{{ ansible_os_family == 'Debian' }}"
+  apt-transport-https:
+    - "{{ ansible_os_family == 'Debian' }}"
+  aufs-tools:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '10' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  bash-completion: []
+  conntrack:
+    - "{{ ansible_os_family in ['Debian', 'RedHat'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   conntrack-tools:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-      distributions:
-        Amazon: {}
-  container-selinux: &redhat_family
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - RedHat
-  curl: {}
+    - "{{ ansible_os_family == 'Suse' or ansible_distribution == 'Amazon' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  container-selinux:
+    - "{{ ansible_os_family == 'RedHat' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  curl: []
   device-mapper:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-  device-mapper-libs: *redhat_family
-  e2fsprogs: {}
-  ebtables: {}
-  gnupg: &debian
-    groups:
-    - k8s_cluster
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "11"
-          - "12"
+    - "{{ ansible_os_family == 'Suse' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  device-mapper-libs:
+    - "{{ ansible_os_family == 'RedHat' }}"
+  e2fsprogs: []
+  ebtables: []
+  gnupg:
+    - "{{ ansible_distribution == 'Debian' }}"
+    - "{{ ansible_distribution_major_version in ['11', '12'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   ipset:
-    enabled: "{{ kube_proxy_mode != 'ipvs' }}"
-    groups:
-    - k8s_cluster
-  iptables: *deb_redhat
+    - "{{ kube_proxy_mode != 'ipvs' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  iptables:
+    - "{{ ansible_os_family in ['Debian', 'RedHat'] }}"
   ipvsadm:
-    enabled: "{{ kube_proxy_mode == 'ipvs' }}"
-    groups:
-    - k8s_cluster
-  libseccomp: *redhat_family
+    - "{{ kube_proxy_mode == 'ipvs' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  libseccomp:
+    - "{{ ansible_os_family == 'RedHat' }}"
   libseccomp2:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-      - Debian
+    - "{{ ansible_os_family in ['Debian', 'Suse'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   libselinux-python:  # TODO: Handle rehat_family + major < 8
-    os:
-      distributions:
-        Amazon: {}
+    - "{{ ansible_distribution == 'Amazon' }}"
   libselinux-python3:
-    os:
-      distributions:
-        Fedora: {}
+    - "{{ ansible_distribution == 'Fedora' }}"
   mergerfs:
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "12"
-  nss: *redhat_family
-  openssl: {}
-  python-apt: *deb_10
-  # TODO: not for debian 10
-  python3-apt: *debian_family_base
+    - "{{ ansible_distribution == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '12' }}"
+  nss:
+    - "{{ ansible_os_family == 'RedHat' }}"
+  openssl: []
+  python-apt:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '10' }}"
+  python3-apt:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version != '10' }}"
   python3-libselinux:
-    os:
-      distributions:
-        RedHat: {}
-        CentOS: {}
-  rsync: {}
-  socat: {}
-  software-properties-common: *debian_family_base
-  tar: {}
-  unzip: {}
-  xfsprogs: {}
+    - "{{ ansible_distribution in ['RedHat', 'CentOS'] }}"
+  rsync: []
+  socat: []
+  software-properties-common:
+    - "{{ ansible_os_family == 'Debian' }}"
+  tar: []
+  unzip: []
+  xfsprogs: []