At this point there seem to be /proc, /sys and /run still under /. For /proc and /sys, there is code to move the mount to /root in /usr/share/initramfs-tools/init. This has also the chain call into run-init which seems to do the final move...
At this point there seem to be /proc, /sys and /run still under /. For /proc and /sys, there is code to move the mount to /root in /usr/share/ initramfs- tools/init. This has also the chain call into run-init which seems to do the final move...