No matching package named core found when building quickstart project

[jcard0na]

I just attempted to build the image but encountered an error in one of the last steps, when the quickstart project is built:

root@b9a96fa5aa60:/xtensa-rust-quickstart# xargo build
warning: dependency (core) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
    Updating crates.io index
error: no matching package named `core` found
location searched: registry `https://github.com/rust-lang/crates.io-index`
required by package `sysroot v0.0.0 (/tmp/xargo.bPt5rGmgAVze)`
error: `"cargo" "build" "--release" "--manifest-path" "/tmp/xargo.bPt5rGmgAVze/Cargo.toml" "--target" "xtensa-esp32-none-elf" "-p" "core"` failed with exit code: Some(101)
note: run with `RUST_BACKTRACE=1` for a backtrace

I'll be happy to try any suggestions and report.

[madbrenner]

@jcard0na I had a similar issue with building the quickstart project with this, so I created my own Docker image that uses cargo xbuild with support for building the project, converting the output binary to an image file, and/or flashing the image to an ESP32.
Please check it out and let me know how it works for you!
Docker Hub: https://hub.docker.com/r/madbrenner/rust-esp32
Source: https://gitlab.com/madbrenner/rust-esp32