Discovering versions and auto-filling hashes

[pvonmoradi]

If a project needs a specific version of a library, one should manually check the nixpkgs repo history to find the desired version. This could be implemented directly into CLI to list all versions of a library.
NixDB does a similar thing as a webapp.
Also, when we are declaring a lib as a dependency, we should either provide a bogus hash or manually calculate it. I think this also should be integrated into nix tooling.

Describe alternatives you've considered
https://github.com/kamadorueda/four-shells

[stale]

I marked this as stale due to inactivity. → More info