feature: Make config installation dir configurable (#173)

* feature: Make config installation dir configurable

Signed-off-by: Thomas Venieris <thomas.venieris@gmail.com>

* fix: blackbox_exporter_config_dir consistent

- Made blackbox_exporter_config_dir parameter consistent with other
  collection roles
- Added new parameter to meta/argument_specs.yml

Signed-off-by: Thomas Venieris <thomas.venieris@gmail.com>

---------

Signed-off-by: Thomas Venieris <thomas.venieris@gmail.com>

roles/blackbox_exporter/defaults/main.yml

@@ -68,3 +68,6 @@ blackbox_exporter_configuration_modules:
 #      preferred_ip_protocol: ip6
 #      validate_answer_rrs:
 #        fail_if_matches_regexp: [test]
+
+# Where to put the blackbox_exporter.yml main configuration file
+blackbox_exporter_config_dir: /etc

roles/blackbox_exporter/meta/argument_specs.yml

@@ -34,3 +34,6 @@ argument_specs:
             http:
               method: GET
               valid_status_codes: []
+      blackbox_exporter_config_dir:
+        description: "Directory where the blackbox exporter configuration file is placed"
+        default: "/etc"

roles/blackbox_exporter/tasks/configure.yml

@@ -12,7 +12,7 @@
 - name: Configure blackbox exporter
   ansible.builtin.template:
     src: blackbox_exporter.yml.j2
-    dest: /etc/blackbox_exporter.yml
+    dest: "{{ blackbox_exporter_config_dir }}/blackbox_exporter.yml"
     owner: root
     group: "{{ blackbox_exporter_group }}"
     mode: 0644

roles/blackbox_exporter/templates/blackbox_exporter.service.j2

@@ -12,7 +12,7 @@ Group={{ blackbox_exporter_group }}
 PermissionsStartOnly=true
 ExecReload=/bin/kill -HUP $MAINPID
 ExecStart=/usr/local/bin/blackbox_exporter \
-  --config.file=/etc/blackbox_exporter.yml \
+  --config.file={{ blackbox_exporter_config_dir }}/blackbox_exporter.yml \
   {% for flag, flag_value in blackbox_exporter_cli_flags.items() -%}
   --{{ flag }}={{ flag_value }} \
   {% endfor -%}