How to specify R path

[liutiming]

There are multiple versions of R installed on my cluster and when I used callr with https://github.com/ropensci/targets and https://github.com/mschubert/clustermq/, although I used R in 3.6.1 and r(function() Sys.which("R")) also returns 3.6.1, the job was submitted in R 4.0... is there an option to specify the path for callr?

[gaborcsardi]

callr alawys runs the same version of R in the subprocess, it uses R.home() to query the path of the current version:

callr/R/setup.R

Line 222 in 65e336f

options$bin <- file.path(R.home("bin"), exec)

There is actually a feature request to run a different version than the current: #89.

So if you can reproduce this, and you think it is a callr bug, then please send use some reproducible example.