macOS support

[xzfc]

It can be done by adapting trace-nix.c to use DYLD_INSERT_LIBRARIES instead of LD_PRELOAD.

Alternative solutions: adding tracing support to nix itself or adopting logged-evaluation.nix from lorri.

[zimbatm]

https://github.com/jacereda/fsatrace has a similar implementation and supports macOS (more or less)

[SuperSandro2000]

Bump. I would need this for darwin but I am not familiar with rust at all.

[olebedev]

Bump on this one

[zimbatm]

I think this project could be combined with https://github.com/numtide/nix-eval-cache which is a bit more generic

[olebedev]

It sounds a bit fragile to be based on timestamps of nix files only, no?

[zimbatm]

It's a trade-off. It's quite rare for files to change and not their metadata. A more precise model would be to hash the content of the files, but that makes the check even more expensive.

[uri-canva]

Took a shot at it: #25