Unable to build nix package

[L0ric0]

Trying to build the nix package fails with the following error:

error: builder for '/nix/store/c7wqyyl07y5qaifwcz689blqalj762qb-468.drv' failed with exit code 1;
       last 9 log lines:                                                                                            
       >
       > trying http://www.ulisses-spiele.de/download/468/
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       > 100   322  100   322    0     0   6618      0 --:--:-- --:--:-- --:--:--  6708
       >   0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
       >   0     0    0     0    0     0      0      0 --:--:--  0:00:03 --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download 468 from any mirror
       For full logs, run 'nix log /nix/store/c7wqyyl07y5qaifwcz689blqalj762qb-468.drv'.
error: 1 dependencies of derivation '/nix/store/m2fl4c0aqpvcka2p5gw8pd0rxjf80r81-dsa41held.drv' failed to build

It seams Ulisses removed the file http://www.ulisses-spiele.de/download/468/ is it possible to get is somewhere else?

[flyx]

This URL seems to host the same pdf: https://dsa-satinavsketten.de/fileadmin/downloads/offiziell/Regelmaterial%26Errata/WdS-Handouts.pdf

Hash is different but (Edit: Hash is actually the same after correctly escaping the URL) extracting the background wallpaper seems to work. I don't have a completely working environment right now to test everything.

Since Ulisses removed the PDF from their site and the alternative URL is also owned by Ulisses, I wouldn't bet on it being available much longer, possibly this is only an oversight since that website seems to be abandoned. Since I am not allowed to redistribute the PDF myself, possibly the best I can do is to make this PDF dependency a non-flake input to the flake, so that people can inject their own local copy of the PDF.

[flyx]

Fixed in 09f662c07f8f2ee77a500ce1955815c9bbbfc71b. Also fixes another download that vanished.

Both files are now flake inputs, so they can potentially be overridden when importing the flake should they vanish. I suggest at least keeping a copy of the files.

Updated Flake needs recent Nix which is able to depend on arbitrary URLs. 2.8.0 is too old, 2.17.0 is working, not sure which is the minimum version that works.