Only mount /etc/{{ pkg_mgr_suffix }}/vars if it exists

/etc/{{ pkg_mgr_suffix }}/vars exists on stream and
some other platforms but is missing from RHEL 8.x.

This patch checks that that directory exists first
before mounting it.

Change-Id: I048434b38eb1d6b1c83a89d90e01f71d467d7fb7

tasks/yum_install_buildah.yml

@@ -38,13 +38,20 @@
     chdir: "{{ yum_repos_dir_path }}"
   register: file_repos
 
+- name: Find if /etc/{{ pkg_mgr_suffix }}/vars exists
+  stat:
+    path: /etc/{{ pkg_mgr_suffix }}/vars
+  register: pkg_mgr_vars_stat
+
 - block:
     - name: Run yum_install.sh
       command: >
         buildah run
           --volume {{ yum_install.path }}:/tmp/yum_install.sh
           --volume {{ yum_repos_dir_path }}:/etc/yum.repos.d
+          {% if pkg_mgr_vars_stat.stat.exists %}
           --volume /etc/{{ pkg_mgr_suffix }}/vars:/etc/{{ pkg_mgr_suffix }}/vars
+          {% endif %}
           {% for repo in file_repos.stdout_lines %}
             {% if repo is exists %}
               --volume {{ repo }}:{{ repo }}
@@ -62,7 +69,9 @@
         buildah --debug run
           --volume {{ yum_install.path }}:/tmp/yum_install.sh
           --volume {{ yum_repos_dir_path }}:/etc/yum.repos.d
+          {% if pkg_mgr_vars_stat.stat.exists %}
           --volume /etc/{{ pkg_mgr_suffix }}/vars:/etc/{{ pkg_mgr_suffix }}/vars
+          {% endif %}
           {% for repo in file_repos.stdout_lines %}
             {% if repo is exists %}
               --volume {{ repo }}:{{ repo }}

tasks/yum_update_buildah.yml

@@ -48,6 +48,11 @@
   register: file_repos
   when: rpms_path is undefined
 
+- name: Find if /etc/{{ pkg_mgr_suffix }}/vars exists
+  stat:
+    path: /etc/{{ pkg_mgr_suffix }}/vars
+  register: pkg_mgr_vars_stat
+
 - name: Define bind-mount modes for yum cache to be populated or used
   when: yum_cache is defined and yum_cache
   block:
@@ -103,7 +108,9 @@
         buildah run
           --volume {{ yum_update.path }}:/tmp/yum_update.sh
           --volume {{ yum_repos_dir_path }}:/etc/yum.repos.d
+          {% if pkg_mgr_vars_stat.stat.exists %}
           --volume /etc/{{ pkg_mgr_suffix }}/vars:/etc/{{ pkg_mgr_suffix }}/vars
+          {% endif %}
           --volume /etc/pki:/etc/pki
           {% if cache_volume is defined and cache_volume %}
           --volume {{ cache_volume }}
@@ -125,7 +132,9 @@
         buildah --debug run
           --volume {{ yum_update.path }}:/tmp/yum_update.sh
           --volume {{ yum_repos_dir_path }}:/etc/yum.repos.d
+          {% if pkg_mgr_vars_stat.stat.exists %}
           --volume /etc/{{ pkg_mgr_suffix }}/vars:/etc/{{ pkg_mgr_suffix }}/vars
+          {% endif %}
           --volume /etc/pki:/etc/pki
           {% for repo in file_repos.stdout_lines %}
             {% if repo is exists %}