Steps to reproduce
1. Wait for a Git commit where the hash begins with 0 (zero), e.g. the present #06772e6 (https://github.com/jamespetts/simutrans-extended/commit/06772e61bc26d962ab38e695882fcea47602187a).
2. Download the Linux client from Bridgewater-Brunel and try to connect to that server.
Expected behaviour
Both server and client report their version using the seven-digit commit hash.
Observed behaviour
The Linux client reports its version using the seven-digit commit hash:
(https://i.imgur.com/eMEtSmY.png)
But the server reports its version with the leading zero omitted:
(https://i.imgur.com/g8XzCsQ.png)
This prevents players joining using the in-game interface.
Workaround
Start the client from a terminal using the parameter -load net:bridgewater-brunel.me.uk in order to override the version check.
Background info
Here (https://forum.simutrans.com/index.php/topic,20592.msg193303.html#msg193303) are some notes I made about a different bug in the commit hash code last year. It might be irrelevant or out of date now.
Thank you for the report - this is a very odd one, especially as the problem appears to occur when the server and client are both running Linux. I do not believe that I wrote the hash truncating code myself (although I cannot remember much about it now), so I am not sure why it would produce different results on the server to those that it produces on the client.
I think the display itself will be fixed in this patch, but I'm not sure if it's affecting the mismatch check.
Because get_game_engine_revision() doesn't change. It just changes the UI display.