FlightGear version check

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Caution  When installing/using aircraft the FlightGear version and the aircraft version must match. Otherwise strange bugs should be expected and the version-mismatch combination will not be supported by the FlightGear community.

If in doubt, people should check the About dialog or even /sim/version in the property tree using the proeperty brwoser.

property browser showing /sim/version info

For aircraft developers

  <minimum-flightgear-version>4.0.0</minimum-flightgear-version>

Minimum FlightGear version required for this aircraft [1], note that this is a "soft" requirement - i.e. it will not terminate fg or trigger an error, but only show a warning in the console/fg window using a Nasal script that checks if the property is set. This is mainly intended to make compatibility issues more obvious, i.e. end-users downloading new aircraft and wanting to use them in conjunction with an old version of FlightGear, which is causing quite a bit of workload on the support forum. We are hoping to also display this info in the About dialog

Fgdata

Note  This is currently just proof-of-concept code which will need to be refined/reviewed and committed to fgdata.

$FG_ROOT/Nasal/version.nas

# anonymous function that will be called directly
(func()
var fgversion = getprop("/sim/version/flightgear");
print("FlightGear v.", fgversion);
)();