As currently implemented, R CMD build copies everything in the package
directory to a working directory, then unlinks those in .Rbuildignore
(see this comment by Jim Hester from 2018).
https://github.com/r-lib/rcmdcheck/issues/90#issuecomment-435938362
If one accidentally happens :-( to create a directory with many
gigabytes of junk in it, say from reverse-dependency-checking a widely
used package, then the presence of that directory (even if
.Rbuildignore'd) will make R CMD build hang as it tries to copy the
contents of the directory ...
I realize it's considerably more complicated to skip .Rbuildignore'd
files in the process of copying (I don't see offhand how to do it
without some fairly fancy unix-`find`-like tool, as opposed to a
straight-up `file.copy(..., recursive = TRUE)`, but I wonder if there's
any appetite for changing this behaviour?
cheers
Ben Bolker
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