Allow ara-report to run on any node

This role had some assumptions that it would run only on the
zuul-executor.  If we remove those assumptions, it can run on any
worker node, which allows it to be used in untrusted playbooks.

Note that this is backwards compatible only in the case that the
user did not provide a non-default value for ara_report_path.  If
a user overrode that (eg, to put the report in a directory other
than "ara" under the executor log dir), this will break.

Change-Id: I3a28368a049fa583398ece8a66f90783f53098f4

roles/ara-report/README.rst

@@ -51,9 +51,7 @@ If ARA is enabled, generates a report or saves a copy of the ARA database.
 .. _mimetypes: https://opendev.org/opendev/puppet-openstackci/src/commit/5fe1f3d2d5e40c2458721e7dcf8631d62ea2525f/templates/logs.vhost.erb#L24
 
 .. zuul:rolevar:: ara_report_path
-   :default: ``ara``
-
-   This path is relative to the root of the log directory.
+   :default: ``{{ zuul.executor.log_root }}/ara``
 
    When report_type is 'html' directory where the HTML report will be generated.
    When report_type is 'database', directory where the database is saved.

roles/ara-report/defaults/main.yaml

@@ -19,8 +19,7 @@ ara_report_type: 'html'
 # Note that when using 'database', an ARA web application can load the database
 # dynamically. See the ARA documentation for details:
 # https://ara.readthedocs.io/en/latest/advanced.html#serving-ara-sqlite-databases-over-http
-# This path is relative to the root of the log directory.
-ara_report_path: 'ara'
+ara_report_path: '{{ zuul.executor.log_root }}/ara'
 
 # When report_type is 'html', whether to compress the ARA HTML output or not
 ara_compress_html: true

roles/ara-report/tasks/main.yaml

@@ -7,7 +7,7 @@
     - name: Warn if ARA is not installed
       debug:
         msg: |
-          ARA is not installed on the executor node, no report will be available.
+          ARA is not installed, no report will be available.
       when: ara_installed.rc != 0
 
     - name: Check that the ARA database exists
@@ -36,10 +36,6 @@
           It is likely that no report will be available, please verify the
           execution and the parameters of the role for details.
 
-- name: Prefix the log path with the log root
-  set_fact:
-    final_ara_report_path: "{{ zuul.executor.log_root }}/{{ ara_report_path }}"
-
 - when:
     - ara_installed.rc == 0
     - ara_db.stat.exists
@@ -48,7 +44,7 @@
     # Always generate (true), never (false) or only on failure ('failure')
     # Additionally cover for edge cases where zuul_success might be undefined
     - name: Generate ARA HTML output
-      command: "{{ ara_report_executable }} generate html {{ final_ara_report_path }}"
+      command: "{{ ara_report_executable }} generate html {{ ara_report_path }}"
       environment:
         ARA_DATABASE: "sqlite:///{{ ara_database_path }}"
       when: ara_report_run | bool or
@@ -56,7 +52,7 @@
       register: ara_generated
 
     - name: Compress ARA HTML output
-      command: gzip --recursive --best {{ final_ara_report_path }}
+      command: gzip --recursive --best {{ ara_report_path }}
       when:
         - ara_compress_html | bool
         - not ara_generated is skipped
@@ -83,11 +79,11 @@
   block:
     - name: Create the ARA database report directory
       file:
-        path: "{{ final_ara_report_path }}"
+        path: "{{ ara_report_path }}"
         state: directory
 
     - name: Save the ARA database
-      command: cp {{ ara_database_path }} {{ final_ara_report_path }}
+      command: cp {{ ara_database_path }} {{ ara_report_path }}
     - name: Return ARA report
       zuul_return:
         data: