Fix downgrades

tasks/pkg-redhat.yml

@@ -31,6 +31,7 @@
     enabled: yes
     gpgcheck: yes
     gpgkey: "{{ datadog_yum_gpgkey }}"
+  register: repofile5
   when: (datadog_agent_major_version|int == 5) and (datadog_yum_repo | length == 0) and (not ansible_check_mode)
 
 - name: Install Datadog Agent 6 yum repo
@@ -41,6 +42,7 @@
     enabled: yes
     gpgcheck: yes
     gpgkey: "{{ datadog_yum_gpgkey }}"
+  register: repofile6
   when: (datadog_agent_major_version|int == 6) and (datadog_yum_repo | length == 0) and (not ansible_check_mode)
 
 - name: Install Datadog Agent 7 yum repo
@@ -51,6 +53,7 @@
     enabled: yes
     gpgcheck: yes
     gpgkey: "{{ datadog_yum_gpgkey_20200908 }}"
+  register: repofile7
   when: (datadog_agent_major_version|int == 7) and (datadog_yum_repo | length == 0) and (not ansible_check_mode)
 
 - name: Install Datadog Custom yum repo
@@ -61,8 +64,16 @@
     enabled: yes
     gpgcheck: yes
     gpgkey: "{{ datadog_yum_gpgkey }}"
+  register: repofilecustom
   when: (datadog_yum_repo | length > 0) and (not ansible_check_mode)
 
+- name: Clean repo metadata if repo changed
+  command: yum clean metadata --disablerepo="*" --enablerepo=datadog
+  ignore_errors: yes # Cleaning the metadata is only needed when downgrading a major version of the Agent, don't fail because of this
+  args:
+    warn: no
+  when: repofile5.changed or repofile6.changed or repofile7.changed or repofilecustom.changed
+
 - name: Remove old yum repo files
   yum_repository:
     name: "ansible_datadog_{{ item }}.repo"