why building RCall.jl failed during the registration of an package

[szcf-weiya]

I am struggling with an error in the AutoMege step when registering my package that depends on RCall.jl. Here is the pull request on the General repo and the action log info.

JuliaRegistries/General#86838
https://github.com/JuliaRegistries/General/actions/runs/5464785321/jobs/9947294633?pr=86838

According to the action log info, it failed during the build of RCall.jl

It confused me that it tries to install a conda R. If I understand correctly, the conda R procedure is only triggered when R_HOME is set to be *,

RCall.jl/deps/build.jl

Lines 27 to 37 in 2df5ef8

	Rhome = get(ENV, "R_HOME", "")
	if Rhome == "*"
	# install with Conda
	@info "Installing R via Conda. To use a different R installation,"*
	" set the \"R_HOME\" environment variable and re-run "*
	"Pkg.build(\"RCall\")."
	conda_provided_r = true
	Conda.add_channel("r")
	Conda.add("r-base>=3.4.0,<4") # greater than or equal to 3.4.0 AND strictly less than 4.0
	Rhome = joinpath(Conda.LIBDIR, "R")
	libR = locate_libR(Rhome)

However, I did not set the env in my package. And I also check the last GitHub action log of RCall.jl in the AutoMerge step,

https://github.com/JuliaRegistries/General/actions/runs/4701731245/jobs/8338139220

Note that it did not print out Info: Installing R via Conda..., so it indeed did not try to install a Conda R, right?

So my question is why it tried to install a conda R during my registration. Am I missing something? Thanks!

[szcf-weiya]

Just found R_HOME=* is defined in the RegistryCI.jl

https://github.com/JuliaRegistries/RegistryCI.jl/blob/a20db2707b49acbff27c382e8acdf775a47bdc97/src/AutoMerge/guidelines.jl#L895

[szcf-weiya]

proposed a solution JuliaPy/Conda.jl#243