4ed59a020d
When launching a GNOME session from a text-mode VT, the logind session type is unlikely to be set to either "wayland" or "x11". We search for a supported session type first with logind and then with $XDG_SESSION_TYPE. As a fallback, we also test $DISPLAY in case of a "tty" logind session to support starting through xinit. Ideally, such setups should set XDG_SESSION_TYPE=x11. If no supported session type is found, we throw an error. https://bugzilla.gnome.org/show_bug.cgi?id=759388