[Rust] Unable to detect build.rs in crate

[Dustin Toff]

Package manage/ecosystem
Rust

Manifest contents prior to update

Cargo.toml

[package]
name = "wowser-glfw-sys"
version = "0.0.1"
authors = ["Dustin Toff <[e-mail]>"]
edition = "2018"
links = "glfw3"

[build-dependencies]
cmake = "0"
git2 = "0"
bindgen = "0"

There is also a build.rs in the same directory.

Updated dependency
N/A

What you expected to see, versus what you actually saw
Dependabot should be able to succeed in analyzing my project and suggesting updates.

It doesn't, however, and fails to parse the manifest with the error

info: syncing channel updates for '1.43.1-x86_64-unknown-linux-gnu'
info: latest update on 2020-05-07, rust version 1.43.1 (8d69840ab 2020-05-04)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-docs'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-docs'
info: installing component 'rust-std'
info: installing component 'rustc'
info: installing component 'rustfmt'
error: failed to parse manifest at `/home/dependabot/dependabot-updater/dependabot_tmp_dir/wowser-glfw-sys/Cargo.toml`

Caused by:
  package `wowser-glfw-sys v0.0.1 (/home/dependabot/dependabot-updater/dependabot_tmp_dir/wowser-glfw-sys)` specifies that it links to `glfw3` but does not have a custom build script

Images of the diff or a link to the PR, issue or logs
Repository: https://github.com/quittle/wowser
Root Cargo.toml: https://github.com/quittle/wowser/blob/master/Cargo.toml
Subcrate Cargo.toml: https://github.com/quittle/wowser/blob/master/wowser-glfw-sys/Cargo.toml
Subcrate build.rs: https://github.com/quittle/wowser/blob/master/wowser-glfw-sys/build.rsc
Dependabot-raised issue: https://github.com/quittle/wowser/issues
Dependabot run logs: dependabot-build-log.txt

Potentially related issue: dependabot/dependabot-core#1627

[Philip Harrison]

Dependabot currently doesn't fetch or run this Build.rs file which is why it's failing. We're looking into adding a dummy version of this file as we have disabled evaluating user-code when running updates.

Related issue: bytecodealliance/wasmtime#1684 (comment)

[Jurre]

I've fixed this behavior in dependabot-core, will try to roll out the change to production today, thanks for flagging it @quittle and thanks for the direction for the fix @feelepxyz 🎉