Allow excludedatabases when using file_per_database

Fixes #449 #461

Author: HT43-bqxFqB

manifests/backup/mysqldump.pp

@@ -33,6 +33,7 @@
   $compression_command      = 'bzcat -zc',
   $compression_extension    = '.bz2',
   $backupmethod_package     = undef,
+  Array[Strings] $excludedatabases = [],
 ) inherits mysql::params {
   $backuppassword_unsensitive = if $backuppassword =~ Sensitive {
     $backuppassword.unwrap

manifests/server/backup.pp

@@ -80,6 +80,8 @@
 #   Configure the file extension for the compressed backup (when using the mysqldump provider)
 # @param backupmethod_package
 #   The package which provides the binary specified by the backupmethod parameter.
+# @param excludedatabases
+#   Give a list of excluded databases when using file_per_database, e.g.: [ 'information_schema', 'performance_schema' ]
 class mysql::server::backup (
   $backupuser               = undef,
   Optional[Variant[String, Sensitive[String]]] $backuppassword = undef,
@@ -110,6 +112,7 @@
   $compression_command      = undef,
   $compression_extension    = undef,
   $backupmethod_package     = $mysql::params::xtrabackup_package_name,
+  Array[Strings] $excludedatabases = [],
 ) inherits mysql::params {
   if $prescript and $provider =~ /(mysqldump|mysqlbackup)/ {
     warning("The 'prescript' option is not currently implemented for the ${provider} backup provider.")
@@ -145,6 +148,7 @@
         'compression_command'      => $compression_command,
         'compression_extension'    => $compression_extension,
         'backupmethod_package'     => $backupmethod_package,
+        'excludedatabases'         => $excludedatabases,
       }
   })
 }

spec/classes/mysql_backup_mysqldump_spec.rb

@@ -71,6 +71,17 @@ class { 'mysql::server': }
           is_expected.not_to contain_package('bzip2')
         }
       end
+
+      context "with file_per_database and excludedatabases" do
+        let(:params) do
+          {
+            'file_per_database'  => true,
+            'excludedatabases'   => [ 'information_schema' ],
+          }.merge(default_params)
+        end
+
+        it { is_expected.to contain_file('mysqlbackup.sh').with_content(%r{grep -v.*information_schema}) }
+      end
     end
   end
   # rubocop:enable RSpec/NestedGroups

templates/mysqlbackup.sh.erb

@@ -81,7 +81,7 @@ cleanup
 <% end -%>
 <% if @backupdatabases.empty? -%>
 <% if @file_per_database -%>
-mysql --defaults-extra-file=$TMPFILE -s -r -N -e 'SHOW DATABASES' | while read dbname
+mysql --defaults-extra-file=$TMPFILE -s -r -N -e 'SHOW DATABASES' <% if ! @excludedatabases.empty? %> | grep -v '^\(<% @excludedatabases.join('|') %>)$' <% end %> | while read dbname
 do
   <%= @backupmethod -%> --defaults-extra-file=$TMPFILE --opt --flush-logs --single-transaction \
     ${ADDITIONAL_OPTIONS} \