R package

[cthoyt]

See:

• https://cran.r-project.org/web/packages/rextendr/vignettes/package.html (tutorial: https://www.youtube.com/watch?v=tRm-Qq2_Ap0)
• https://github.com/r-rust (template repo: https://github.com/r-rust/hellorust; this is mediated with C, which has caused various inflammatory reactions)

[cthoyt]

@vemonet looks like there's an issue with the R build right now

[vemonet]

Nice consistency, 3 months ago: Adding libR-sys v0.6.0 (latest: v0.7.1) no problem in the GH workflow where R was not present

And all of sudden, same version, no changes in any dependencies, it now fails because R not present on the system (according to their logs)

error: failed to run custom build command for `libR-sys v0.6.0`

Caused by:
  process didn't exit successfully: `/home/runner/work/curies.rs/curies.rs/target/debug/build/libR-sys-8058795fe5904c73/build-script-build` (exit status: 1)
  --- stdout
  Problem locating local R install: Os { code: 2, kind: NotFound, message: "No such file or directory" }

So I have added - uses: r-lib/actions/setup-r@v2, and now cargo build and clippy pass, but cargo test fails because the official action to setup R is not doing its job properly... error while loading shared libraries: libR.so: cannot open shared object file: No such file or directory (nice testament of the quality bad of R environment setup...).

Note the test pass on my machine where R is installed (I managed to installed it somehow, but it was failing to install standard R packages like testthat so I kind of left it on the side...)

Funny thing is that I don't even provide a single test for the R part, so no idea why now it tries to run it and fails

Finally, adding sudo apt-get install -y r-base r-base-dev after the setup-r fixes it...

If someone with some decent experience on how to setup and install R elegantly in a way that is reproducible (i.e. through bash commands for mac, debian and gh actions), I would love to get some guidelines