kubernetes/vendor/github.com/opencontainers/runc/libcontainer/cgroups/systemd/user.go

// newUserSystemdDbus creates a connection for systemd user-instance.
func newUserSystemdDbus() (*systemdDbus.Conn, error) { … }

// DetectUID detects UID from the OwnerUID field of `busctl --user status`
// if running in userNS. The value corresponds to sd_bus_creds_get_owner_uid(3) .
//
// Otherwise returns os.Getuid() .
func DetectUID() (int, error) { … }

// DetectUserDbusSessionBusAddress returns $DBUS_SESSION_BUS_ADDRESS, if set.
// Otherwise it returns "unix:path=$XDG_RUNTIME_DIR/bus", if $XDG_RUNTIME_DIR/bus exists.
func DetectUserDbusSessionBusAddress() (string, error) { … }