Noticed the following warning:
```
direnv: `nix_direnv_watch_file` is deprecated - use `watch_file`
```
Which seems to come from here:
6455f38a8d/direnvrc (L207)
Seems this check is no longer needed
check-by-name: Remove check from .envrc
Co-authored-by: Silvan Mosberger <github@infinisil.com>
Now that the previous commit removed all the .display()'s that were
previously necessary for PathBuf's, but now aren't for RelativePathBuf,
we can also inline the format! arguments
An edge case was allowed when it shouldn't be: A package defined in
`pkgs/by-name` could be overridden in `all-packages.nix` if it was of
the form `callPackage (<expr>) { <non-empty> }`.
This is not right, it's required that the first argument be the path
matching the package to be overridden.
This adds a test to check that a commit like 0a3dab4af3 would fail CI
After doing some improvements to the `pkgs/by-name` check I discovered
that sbcl shouldn't have been allowed in `pkgs/by-name` after all as is.
Specifically, the requirement is that if `pkgs/by-name/sb/sbcl` exists,
the definition of the `sbcl` attribute must look like
sbcl = callPackage ../by-name/sb/sbcl/package.nix { ... };
However it currently is an alias like
sbcl = sbcl_2_4_1;
This wasn't detected before because `sbcl_2_4_1` was semantically
defined using `callPackage`:
sbcl_2_4_1 = wrapLisp {
pkg = callPackage ../development/compilers/sbcl { version = "2.4.1"; };
faslExt = "fasl";
flags = [ "--dynamic-space-size" "3000" ];
};
However this doesn't syntactically match what is required.
In https://github.com/NixOS/nixpkgs/pull/285089 I introduced syntactic
checks for exactly this, but they were only used for packages not
already in `pkgs/by-name`.
Only now that I'm doing the refactoring to also use this check for
`pkgs/by-name` packages this problem is noticed.
While introducing this new check is technically an increase in
strictness, and therefore would justify adding a new ratchet, I consider
this case to be rare enough that we don't need to do that.
This commit introduces a test to prevent such regressions in the
future
Moving sbcl back out of `pkgs/by-name` will be done when the pinned CI is updated
- Detect manual use of _internalCallByNamePackageFile for packages in
`pkgs/by-name` (can't be done for others though)
- Separate error message for when attribute locations can't be
determined for `pkgs/by-name` attributes
- Much better structure of the code in eval.rs, representing more
closely what is being checked
- Much more extensive comments
