[caspar]

Last time I checked,[0] this works great - as long as you don't particularly care which specific versions of imagemagick or cowsay you want.

If you do care, then welcome to learning about niv, flakes, etc.

[0]: admittedly 3 years ago or so.

[loremm]

This is a hack but I still found it helpful. If you do want to force a certain version, without worrying about flakes [1] this can be your bash shebang, with similar for nix configuration.nix or nix-shell interactive. It just tells nix to use a specific git hash for it's base instead of whatever your normal channel is.

For my use case, most things I don't mind tracking mainline, but some things I want to fix (chromium is very large, python changes a lot, or some version broke things)

```

#! nix-shell -i bash -p "cowsay" '(import (fetchTarball { url="https://github.com/NixOS/nixpkgs/archive/eb090f7b923b1226e8b..."; sha256 = "15iglsr7h3s435a04313xddah8vds815i9lajcc923s4yl54aj4j";}) {}).python3'

```

[1] flakes really aren't bad either, especially if you think about it as just doing above, but automatically