app.php: make it idempotent from a puppet point of view

manifests/init.pp

@@ -26,6 +26,7 @@ class comptoir (
   String $comptoir_db_password         = 'comptoir',
   String $comptoir_db_host             = 'localhost',
   String $comptoir_db_port             = '5432',
+  Boolean $debug                       = false,
 ) {
 
   # Inner variables
@@ -48,14 +49,6 @@ class comptoir (
   # TODO Improve puppet code to be idempotent,
   # TODO ...maybe by creating an idempotent SQL, see https://stackoverflow.com/questions/33631186/how-do-i-make-alter-column-idempotent
 
-  # 2019-03-17 MFaure: could no make the connection validation work :(
-  # postgresql_conn_validator { 'validate my postgres connection':
-  #   host        => $comptoir_db_host,
-  #   port        => $comptoir_db_port,
-  #   db_username => $comptoir_db_user,
-  #   db_password => $comptoir_db_password,
-  #   db_name     => $comptoir_db_name,
-  # } ->
   postgresql_psql { 'Create SQL tables & procedures':
     command   => "\i ${comptoir_dir}/${_SQL_create_tables_and_procedure}",
     db        => $comptoir_db_name,
@@ -72,11 +65,12 @@ class comptoir (
   }
 
   # Comptoir configuration: APP.PHP
-  -> Exec { 'Comptoir remove debug':
+  -> Exec { 'Comptoir enable debug':
     command     => "/bin/sed -i -e \"s/\/\/COMPTOIR-DEBUG//\" $_file_app_php",
     cwd         => $comptoir_dir,
     user        => $comptoir_user,
     environment => [ 'HOME=/home/comptoir' ],
+    onlyif      => [ $debug, "grep '//COMPTOIR-DEBUG' $_file_app_php" ],
   }
 
   # Comptoir configuration: COMPTOIR.PHP