stdenv/mkDerivation: derive pname and version when not given

[Synthetica9]

Motivation for this change

Add pname and version to all packages automatically when not already given.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Added a release notes entry if the change is major or breaking
• Fits CONTRIBUTING.md.

[Synthetica9]

This shouldn't break anything, unless anyone is explicitly depending on pname or version not being set somewhere. Is it major enough for a release notes entry? Do we want to backport this to 21.05?

[grahamc]

I am keen on seeing the evaluation performance report in the Checks tab for this change.

[jtojnar]

It sounds problematic for the same reason as #68620 (comment).

[Synthetica9]

It sounds problematic for the same reason as #68620 (comment).

Yeah, I was thinking about adding a check to ensure that name = "${pname}-${version}

[xaverdh]

actually this is pretty cool!

Yeah, I was thinking about adding a check to ensure that name = "${pname}-${version}

we could also hunt down those occurrences (in nixpkgs), by adding a trace

[stale]

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

[drupol]

Hi @Synthetica9,

I'm cherry-picking abandoned PR in nixpkgs and I found this one, I think this could be a nice addition.

Do you think you could give it a refresh so we can move forward?

If not, feel free to close the PR.

Thanks in advance.

[jtojnar]

Another reason this can be problematic is that with the current convention for unstable versions, it can split it improperly – not that there are many such packages (16 according to comm -12 <(rg -l '\bname.+\$\{version' | sort) <(rg -l 'version = .+unstable' | sort)).

But I would rather just treat name as opaque and require explicit pname and version for project packages.

[Artturin]

We're moving away from setting name #103997 so i don't see a need for this PR