ignore causes all calls to fetch(3) or functions that call fetch(3) (e.g., sub(3), include(3), etc) for all packages matching the glob pattern to be ignored.
Glob patterns must be escaped so that they are not expanded by the shell before the call to ignore.
To ignore a file or package, ignore must be called with a pattern that matches the file or package before the file or package is supposed to be fetched by the script.