The motivation is a touch convoluted. I dual boot Linux and MS-Windows. Having the Steam Linux client use a library made under MS-Windows does NOT work; running any game this way fails (I think this is because how Steam does its Proton integration). However, what does work is to make the explicit directory name of the game in the Linux game library and then softlink all of the MS-Windows install game files to it. For example, for the game 30XX the sequence is:

/code
~/.steam/steam/steamapps/common$ mkdir 30XX
~/.steam/steam/steamapps/common$ ln -s /path/to/windows/install/30XX/* 30XX
/encode

then installing the game on the Steam Linux client is just validating the files; though make sure the NTFS partition is mounted rw (instead of ro)

Now for my part; my Linux partition is not very big and a number of games exceed its freespace and so the Steam Linux client will refuse to "install" a game because it won't fit even though in truth nothing is downloaded and it does "fit" because the files are already there (via softlinks).

So, is there a way to get the Steam Linux Client to skip the space check? or a way to lie to the Steam Linux client on space remaining? This is also valid if people do interesting soft-link logic under .steam as well....