Add support for db purge cron job

This patch introduces a new class, manila::cron::db_purge, to set up
cron job to purge soft deleted records from database.

Backport note:
This change includes the follow-up change[1] which fixed the wrong
description.
[1] ace61c29eb

Also, fixed lint error caused by old lint packages in stable/train

Conflicts:
	spec/acceptance/basic_manila_spec.rb

Change-Id: I815a170a7fb2fc3c48bfabcfdf865d6a22f5cbe8
(cherry picked from commit 8ecb5530ba)
(cherry picked from commit f4ee768ce2)

manifests/cron/db_purge.pp

@@ -0,0 +1,89 @@
+#
+# Copyright (C) 2020 Red Hat Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# == Class: manila::cron::db_purge
+#
+# Remove deleted records from database
+#
+# === Parameters
+#
+#  [*minute*]
+#    (optional) Defaults to '1'.
+#
+#  [*hour*]
+#    (optional) Defaults to '0'.
+#
+#  [*monthday*]
+#    (optional) Defaults to '*'.
+#
+#  [*month*]
+#    (optional) Defaults to '*'.
+#
+#  [*weekday*]
+#    (optional) Defaults to '*'.
+#
+#  [*user*]
+#    (optional) User with access to manila files.
+#    Defaults to 'manila'.
+#
+#  [*age*]
+#    (optional) Number of days prior to today for deletion,
+#    e.g. value 60 means to purge deleted rows that have the "deleted_at"
+#    column greater than 60 days ago.
+#    Defaults to 0
+#
+#  [*destination*]
+#    (optional) Path to file to which rows should be archived
+#    Defaults to '/var/log/manila/manila-rowsflush.log'.
+#
+#  [*maxdelay*]
+#    (optional) In Seconds. Should be a positive integer.
+#    Induces a random delay before running the cronjob to avoid running
+#    all cron jobs at the same time on all hosts this job is configured.
+#    Defaults to 0.
+#
+#
+class manila::cron::db_purge (
+  $minute      = 1,
+  $hour        = 0,
+  $monthday    = '*',
+  $month       = '*',
+  $weekday     = '*',
+  $user        = 'manila',
+  $age         = 0,
+  $destination = '/var/log/manila/manila-rowsflush.log',
+  $maxdelay    = 0,
+) {
+
+  include ::manila::deps
+
+  if $maxdelay == 0 {
+    $sleep = ''
+  } else {
+    $sleep = "sleep `expr \${RANDOM} \\% ${maxdelay}`; "
+  }
+
+  cron { 'manila-manage db purge':
+    command     => "${sleep}manila-manage db purge ${age} >>${destination} 2>&1",
+    environment => 'PATH=/bin:/usr/bin:/usr/sbin SHELL=/bin/sh',
+    user        => $user,
+    minute      => $minute,
+    hour        => $hour,
+    monthday    => $monthday,
+    month       => $month,
+    weekday     => $weekday,
+    require     => Anchor['manila::install::end'],
+  }
+}

releasenotes/notes/cron-db_purge-749e862ad2d40647.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``manila::cron::db_purge`` class has been added. This class can be
+    used to set up cron job to purge soft-deleted records from database.

spec/acceptance/basic_manila_spec.rb

@@ -57,6 +57,7 @@ describe 'basic manila' do
         ssl => false,
       }
       class { '::manila::scheduler': }
+      class { '::manila::cron::db_purge': }
 
       # missing: backends, share, service_instance
       EOS
@@ -71,5 +72,8 @@ describe 'basic manila' do
       it { is_expected.to be_listening }
     end
 
+    describe cron do
+      it { is_expected.to have_entry('1 0 * * * manila-manage db purge 0 >>/var/log/manila/manila-rowsflush.log 2>&1').with_user('manila') }
+    end
   end
 end

spec/classes/manila_cron_db_purge_spec.rb

@@ -0,0 +1,65 @@
+require 'spec_helper'
+
+describe 'manila::cron::db_purge' do
+  let :params do
+    {
+      :minute      => 1,
+      :hour        => 0,
+      :monthday    => '*',
+      :month       => '*',
+      :weekday     => '*',
+      :user        => 'manila',
+      :age         => '0',
+      :maxdelay    => 0,
+      :destination => '/var/log/manila/manila-rowsflush.log'
+    }
+  end
+
+  shared_examples 'manila::cron::db_purge' do
+    context 'with required parameters' do
+      it { is_expected.to contain_cron('manila-manage db purge').with(
+        :command     => "manila-manage db purge #{params[:age]} >>#{params[:destination]} 2>&1",
+        :environment => 'PATH=/bin:/usr/bin:/usr/sbin SHELL=/bin/sh',
+        :user        => params[:user],
+        :minute      => params[:minute],
+        :hour        => params[:hour],
+        :monthday    => params[:monthday],
+        :month       => params[:month],
+        :weekday     => params[:weekday],
+        :require     => 'Anchor[manila::install::end]'
+      )}
+    end
+
+    context 'with required parameters with max delay enabled' do
+      before :each do
+        params.merge!(
+          :maxdelay => 600
+        )
+      end
+
+      it { should contain_cron('manila-manage db purge').with(
+        :command     => "sleep `expr ${RANDOM} \\% #{params[:maxdelay]}`; manila-manage db purge #{params[:age]} >>#{params[:destination]} 2>&1",
+        :environment => 'PATH=/bin:/usr/bin:/usr/sbin SHELL=/bin/sh',
+        :user        => params[:user],
+        :minute      => params[:minute],
+        :hour        => params[:hour],
+        :monthday    => params[:monthday],
+        :month       => params[:month],
+        :weekday     => params[:weekday],
+        :require     => 'Anchor[manila::install::end]'
+      )}
+    end
+  end
+
+  on_supported_os({
+    :supported_os => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'manila::cron::db_purge'
+    end
+  end
+end