function install_display_requirements

Displays installation requirements.

Parameters

array $install_state: An array of information about the current installation state.

array $requirements: An array of requirements, in the same format as is returned by hook_requirements().

Return value

array|null A themed status report, or an exception if there are requirement errors. If there are only requirement warnings, a themed status report is shown initially, but the user is allowed to bypass it by providing 'continue=1' in the URL. Otherwise, no output is returned, so that the next task can be run in the same page request.

Throws

\Drupal\Core\Installer\Exception\InstallerException

File

core/includes/install.core.inc, line 2273

Code

function install_display_requirements($install_state, $requirements) {
    // Check the severity of the requirements reported.
    $severity = drupal_requirements_severity($requirements);
    // If there are errors, always display them. If there are only warnings, skip
    // them if the user has provided a URL parameter acknowledging the warnings
    // and indicating a desire to continue anyway. See drupal_requirements_url().
    if ($severity == REQUIREMENT_ERROR || $severity == REQUIREMENT_WARNING && empty($install_state['parameters']['continue'])) {
        if ($install_state['interactive']) {
            $build['report']['#type'] = 'status_report';
            $build['report']['#requirements'] = $requirements;
            if ($severity == REQUIREMENT_WARNING) {
                $build['#title'] = t('Requirements review');
                $build['#suffix'] = t('Check the messages and <a href=":retry">retry</a>, or you may choose to <a href=":cont">continue anyway</a>.', [
                    ':retry' => drupal_requirements_url(REQUIREMENT_ERROR),
                    ':cont' => drupal_requirements_url($severity),
                ]);
            }
            else {
                $build['#title'] = t('Requirements problem');
                $build['#suffix'] = t('Check the messages and <a href=":url">try again</a>.', [
                    ':url' => drupal_requirements_url($severity),
                ]);
            }
            return $build;
        }
        else {
            // Throw an exception showing any unmet requirements.
            $failures = [];
            foreach ($requirements as $requirement) {
                // Skip warnings altogether for non-interactive installations; these
                // proceed in a single request so there is no good opportunity (and no
                // good method) to warn the user anyway.
                if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
                    $render_array = [
                        '#type' => 'inline_template',
                        '#template' => '{{ title }}:{{ value }}<br /><br />{{ description }}',
                        '#context' => [
                            'title' => $requirement['title'],
                            'value' => $requirement['value'],
                            'description' => $requirement['description'],
                        ],
                    ];
                    $failures[] = \Drupal::service('renderer')->renderInIsolation($render_array);
                }
            }
            if (!empty($failures)) {
                throw new InstallerException(implode("\n\n", $failures));
            }
        }
    }
}