Verifies an archive after it has been downloaded and extracted.
This function is responsible for invoking hook_verify_update_archive().
string $project: The short name of the project to download.
string $archive_file: The filename of the unextracted archive.
string $directory: The directory that the archive was extracted into.
array An array of error messages to display if the archive was invalid. If there are no errors, it will be an empty array.
function update_manager_archive_verify($project, $archive_file, $directory) {
return module_invoke_all('verify_update_archive', $project, $archive_file, $directory);
}