rcmd_safe_env {callr}

rcmd_safe_env returns a set of environment variables that are more appropriate for rcmd_safe(). It is exported to allow manipulating these variables (e.g. add an extra one), before passing them to the rcmd() functions.

Description

It currently has the following variables:

• CYGWIN="nodosfilewarning": On Windows, do not warn about MS-DOS style file names.

• R_TESTS="" This variable is set by ⁠R CMD check⁠, and makes the child R process load a startup file at startup, from the current working directory, that is assumed to be the ⁠/test⁠ directory of the package being checked. If the current working directory is changed to something else (as it typically is by testthat, then R cannot start. Setting it to the empty string ensures that callr can be used from unit tests.

• R_BROWSER="false": typically we don't want to start up a browser from the child R process.

• R_PDFVIEWER="false": similarly for the PDF viewer.

Usage

rcmd_safe_env()

Details

Note that callr also sets the R_ENVIRON, R_ENVIRON_USER, R_PROFILE and R_PROFILE_USER environment variables appropriately, unless these are set by the user in the env argument of the r, etc. calls.

Value

A named character vector of environment variables.