Fly is doing fancy stuff to avoid using docker entirely, but with docker you can just run "docker export" to dump an image to a .tar file that contains the whol

Fly is doing fancy stuff to avoid using docker entirely, but with docker you can just run "docker export" to dump an image to a .tar file that contains the whole filesystem. Built-in feature. I use this as a convenient way to grab a foreign platform sysroot for clang cross-compilation; just pick a Docker image and rip the filesystem out.