1

One of the recent Craft updates (something close to 3.1.25) also brought a redactor migration (https://github.com/craftcms/redactor/blob/v2/src/migrations/m190225_003922_split_cleanup_html_settings.php), which fails when those 2 configs are disabled:

'allowAdminChanges' => false,
'useProjectConfigFile' => false,

The reason why it fails is that the migration tries to do something with projectConfig, which is read only when allowAdminChanges is disabled.

2

According to P&T this is expected behavior. Their solution is to put this in config/app.php:

'components' => [
    'projectConfig' => function() {
        $config = craft\helpers\App::projectConfigConfig();
        $config['readOnly'] = false;
        return Craft::createObject($config);
    },
],

(Thanks Oli, Brandon, Andris!)

Since I do all migration via Craft's console commands, this shorter solution works for me:

'allowAdminChanges' => (php_sapi_name() === 'cli')

It simply enables admin changes when using the console command.

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