Run an R child process, with no configurationSource:
It tries to mimic a fresh R installation. In particular:
No library path setting.
No CRAN(-like) repository is set.
The system and user profiles are not run.
Function object to call in the new R process. The function should be self-contained and only refer to other functions and use variables explicitly from other packages using the
::notation. By default the environment of the function is set to
.GlobalEnvbefore passing it to the child process. (See the
packageoption if you want to keep the environment.) Because of this, it is good practice to create an anonymous function and pass that to
callr, instead of passing a function object from a (base or other) package. In particular
does not work, because
.libPathsis defined in a special environment, but
works just fine.
Arguments to pass to the function. Must be a list.
The library path.
NULL, then no
reposoption is set. This options is only used if
FALSE, as it is set using the system or the user profile.
Command line arguments to pass to the R process. Note that
c("-f", rscript)is appended to this,
rscriptis the name of the script file to run. This contains a call to the supplied function and some error handling code.
Whether to use the system profile file.
Whether to use the user's profile file. If this is
"project", then only the profile from the working directory is used, but the
R_PROFILE_USERenvironment variable and the user level profile are not. See also "Security considerations" below.
Environment variables to set for the child process.
Additional arguments are passed to
callr makes a copy of the user's
.Renviron file and potentially of
the local or user
.Rprofile, in the session temporary
directory. Avoid storing sensitive information such as passwords, in
your environment file or your profile, otherwise this information will
get scattered in various files, at least temporarily, until the
subprocess finishes. You can use the keyring package to avoid passwords
in plain files.