Nixpkgs: Processing seems broken (again?)

[maxdevjs]

Describe the bug

This issue has been previously referenced in #66518 and should have been fixed in #66740 . I tried to install Processing today and I get the same error described in #66518 .

hash mismatch in fixed-output derivation '/nix/store/74jkcqrddp7nxijr3ha09d2mnfck5836-reference.zip':
  wanted: sha256:0ai0cr62gc7n6y22ki3qibyj1qnlaxv1miqxmmahfk3hpbyfqz9n
  got:    sha256:198bpk8mzns6w5h0zdf50wr6iv7sgdi6v7jznj5rbsnpgyilxz35

cannot build derivation '/nix/store/bp16h84nmjx2fysz2ikaz41i5kw9hbwm-processing3-3.4.drv': 1 dependencies couldn't be built

Metadata
Please run nix run nixpkgs.nix-info -c nix-info -m and paste the result.

- system: `"x86_64-linux"`
 - host os: `Linux 4.19.77, NixOS, 19.03.173575.0e0ee084d6d (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - channels(max): `""`
 - channels(root): `"nixos-19.03.173663.6d448d7fbd6"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

Basically I get the old 3-3.4 and not the new 3.5.3.

How can I have the fixed version? Is it not available for channel 19.03 (I already updated the channel)?

[kolbycrouch]

Perhaps the hash wasn't updated to the reflect the version. Try copy-pasting the "got" hash into the expression for "processing" in your NIX_PATH and see if that works for you.

[maxdevjs]

Thank you @kolbycrouch , I had to switch to channel 19.09 to get the fixed version :)

[stephane-rolland]

@maxdevjs is it still ok for you ? Tried on the 19.09 in the current state and it still fails the same way. Gonna update the channel to check if that's better.

[maxdevjs]

@stephane-rolland sorry for the late reply.

No, for what I know it broke again a couple days after it was fixed (#66740, my comment) and still it is in 19.09 (tried right now).

I am not using NixOS, but what I did back then has been to use steam-run (installed steam-run-native).

Edit: did you find a solution?

[stephane-rolland]

@maxdevjs sorry I did not find a solution. But I did not tried very hard. I wanted just to give Processing a try, and discovered that Processing Python module is based on obsolete Python 2.7 / Jython , so it was not what I wanted.