bug#43810: ripgrep and fd create .crates.toml which reference to build dir.

[Efraim Flashner]

On Mon, Oct 05, 2020 at 03:45:45PM +0800, Zhu Zihao wrote:
> In Guix commit 7cb4440951fa3a91d48c63ac5be123636abfcf82. I found that ripgrep 
> and fd will emit a `.crates.toml` file outside of FHS structure(at the root 
> of profile).
> 
> 
> For example, the .crates.toml file from fd looks like.
> 
> 
> 
> ```
> 
> [v1]
> "fd-find 8.1.1 (path+file:///tmp/guix-build-fd-8.1.1.drv-0/fd-find-8.1.1)" = 
> ["fd"]
> ```
> 
> 
> This file records the build directory, I think we'd better to exclude this to 
> improve the determinisitc(If this file doesn't affect the functionality).
> 
> 
> If we can't exclude it, it's better to place it in a proper place, if we 
> leave it in the root of profile, .crates.toml from different rust apps will 
> override each other.

It turns out this file seems to exist in other crate packages too. I
just checked rust-cbindgen. Luckily the rust bootstrap process doesn't
use the cargo-build-system so it's something we can fix on master and
not staging.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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