Recent versions of Raspbian have been auto-magically copying
/etc/wpa_supplicant/wpa_supplicant.conf at boot as well as interpreting
/boot/ssh to enable the SSH service to allow most OSes to do headless setup of Raspbian.
Try it out and report your findings here! You may be surprised at the ingenuity of Raspberry Pi engineers in spite of the fact that not every OS supports Linux filesystems