Raspberry Pi can emulate USB gadgets so we emulate it as a USB mass storage device that PS5 can write into and than we start a web server which provide you UI to access into the content of that emulated storage.
Note that will the access is enabled on the Web UI, the storage will be unmounted from PS5. You will need to lock it again for it to be usable on PS5.
I might have missed some steps here...
From a computer:
run yarn; yarn build in the repo
copy the repo into the sd card
From the raspberry pi:
Setup USB gadget mode (add dtoverlay=dwc2 to /boot/config, add dwc2 and g_mass_storage to /etc/modules)
Install nginx, supervisor, avahi-daemon, ruby
Change its hostname to pips5 (this allows it to be reachable via pips5.local)
copy supervisord.conf to /etc/supervisord/conf.d/pips5.conf
copy nginx.conf to /etc/nginx/sites-available/default
add fstab to /etc/fstab
add modprobe.conf to /etc/modprobe.conf
run setup.sh to create a 4GB image file
run bundle install in the repo
make sure nginx, supervisor and avahi-daemon are enabled (systemctl enable)
PS5 A small writeup + code for ROP userland execution for PS5 firmware 4.03