latest nightly toolchain (a37c32e2d 2020-06-11) fails to build this crate: "file with name 'README.md' was not found"

[oconnor663]

https://github.com/oconnor663/blake2_simd/runs/764237325

In that run, I see this failure in one of my sub-crates:

/usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo test

    Updating crates.io index
 Downloading crates ...
error: failed to download `remove_dir_all v0.5.2`

Caused by:
  unable to get packages from source

Caused by:
  failed to parse manifest at `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.2/Cargo.toml`

Caused by:
  readme file with name 'README.md' was not found
Command failed :(

In my CI setup, it only fails on the nightly compiler, but it seems to reliably fail with nightly on every OS target. However locally, I can't seem to reproduce the failure at all.

Any chance you recognize this error message? I just have no idea what could really be causing it.

[XAMPPRocky]

Thank you for your issue! If you’re only getting this on nightly then likely there’s been regression on the rustc/cargo side. Would you mind reporting it upstream?

[dignifiedquire]

It seems this was fixed on master in e2747c6 but not yet published. As far as I understand the issue is that cargo/rustc is now more strict on these checks, actually failing the build when these files are missing.

[oconnor663]

Ok, now I see why I wasn't repro'ing this locally. I was using the default rustup profile, so rustup update was doing this:

info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'                                                                                                                           
info: latest update on 2020-06-12, rust version 1.46.0-nightly (a37c32e2d 2020-06-11)                                                                                                          
info: skipping nightly which is missing installed component 'rustfmt-preview'                                                                                                                  

But on CI, I was doing rustup set profile minimal, so I was able to pick up that build. Presumably in a few days when a more complete nightly build comes out, everyone running the default profile will start seeing this issue on nightly too.

[oconnor663]

I just confirmed that adding this to my Cargo.toml fixes the problem:

[patch.crates-io]
remove_dir_all = { git = 'https://github.com/XAMPPRocky/remove_dir_all' }

Based on that, could you publish current master as a v0.5.3 release? I think that would fix most callers automatically.

[oconnor663]

I just filed rust-lang/rust#73282 upstream. EDIT: Looks like this is tracked at rust-lang/cargo#8351 and already fixed by rust-lang/cargo#8353.

[XAMPPRocky]

I’ll publish a patch release shortly that should address the issue.

[kvark]

We are also hit by this in gfx-rs land. Looking forward to a patch!

[XAMPPRocky]

This has been fixed in 0.5.3.