Change status code when config is write protected

Add hint msg, you can make config file read only

If the config.php is not writable, print an error message: #6893
 - set config writable
 - or set option to keep it read only

Signed-off-by: Eric Masseran <rico.masseran@gmail.com>

lib/base.php

@@ -249,14 +249,18 @@ class OC {
 			if (self::$CLI) {
 				echo $l->t('Cannot write into "config" directory!')."\n";
 				echo $l->t('This can usually be fixed by giving the webserver write access to the config directory')."\n";
-				echo "\n";
 				echo $l->t('See %s', [ $urlGenerator->linkToDocs('admin-dir_permissions') ])."\n";
+				echo "\n";
+				echo $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it.')."\n";
+				echo $l->t('See %s', [ $urlGenerator->linkToDocs('admin-config') ])."\n";
 				exit;
 			} else {
 				OC_Template::printErrorPage(
 					$l->t('Cannot write into "config" directory!'),
 					$l->t('This can usually be fixed by giving the webserver write access to the config directory. See %s',
-					 [ $urlGenerator->linkToDocs('admin-dir_permissions') ])
+					[ $urlGenerator->linkToDocs('admin-dir_permissions') ]) . '. '
+					. $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it. See %s',
+					[ $urlGenerator->linkToDocs('admin-config') ] )
 				);
 			}
 		}

lib/private/legacy/util.php

@@ -745,7 +745,9 @@ class OC_Util {
 				$errors[] = array(
 					'error' => $l->t('Cannot write into "config" directory'),
 					'hint' => $l->t('This can usually be fixed by giving the webserver write access to the config directory. See %s',
-						[$urlGenerator->linkToDocs('admin-dir_permissions')])
+						[ $urlGenerator->linkToDocs('admin-dir_permissions') ]) . '. '
+						. $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it. See %s',
+						[ $urlGenerator->linkToDocs('admin-config') ] )
 				);
 			}
 		}