feat(nix): Ignore many files when creating src

[doronbehar]

No description provided.

[doronbehar]

In response to #1231 (comment)

[alerque]

Thanks for looking into this.

Just a few question marks in my mind. See comments, plus more generally does this filter have any kind of wildcard/globbing/regex support? Could it accept a file list from another source / format? We now have include/exclude lists for quite a few purposes: git ignores, linting include / exclude, vendored libraries, autotools dist_files, docker builds, etc. Someday we're going to want to unify them a bit.

[doronbehar]

more generally does this filter have any kind of wildcard/globbing/regex support?

Sort of, but it's not that well developed, see: https://github.com/numtide/nix-filter#design-notes

Could it accept a file list from another source / format?

Yes, we can read a list of files from another file, we can even read that list of files and ignore the file itself along.

We now have include/exclude lists for quite a few purposes: git ignores, linting include / exclude, vendored libraries, autotools dist_files, docker builds, etc. Someday we're going to want to unify them a bit.

I'm not against that, but to my view many of these exclude lists perhaps intersect but not match a lot since they serve different purposes. The sole purpose of this exclude list is to make the source directory of the build cleaner so that running nix build two times in a row won't require a real rebuild if the source is exactly the same - exactly the same regarding source files that are actually used in the build.

I do see a reason to ignore both what's in the list here, and what's written in .gitignore. I'll see how can I use https://github.com/hercules-ci/gitignore.nix as well.

[doronbehar]

.gitignore is used now to ignore files, and the other list of files are also excluded.