ISSUE:
It looks like Rgui.exe never processes ~/.Renviron - only ./.Renviron.
REPRODUCIBLE EXAMPLE:
On Windows, create the following ~/.Renviron and ~/.Rprofile files:
C:\Users\alice> Rscript -e "cat('FOO=123\n', file='~/.Renviron')"
C:\Users\alice> Rscript -e "cat('print(Sys.getenv(\'FOO\'))',
file='~/.Rprofile')"
and launch Rgui (from a folder other that ~):
C:\Users\alice> Rgui
and you'll see that FOO is reported as "" (empty), whereas with R or
Rscript, it is reported as "123".
TROUBLESHOOTING:
>From code inspection
(<https://github.com/wch/r-source/blob/1658c8491e9cdc6d2fe61603ed23ae56232b6727/src/main/Renviron.c#L298-L301>):
#ifdef Win32
{
char buf[1024]; /* MAX_PATH is less than this */
/* R_USER is not necessarily set yet, so we have to work harder */
s = getenv("R_USER");
if(!s) s = getenv("HOME");
if(!s) return;
snprintf(buf, 1024, "%s/.Renviron", s);
s = buf;
}
#endif
I think it happens because neither R_USER nor HOME is set when the
Rgui startup process calls process_user_Renviron().
WORKAROUND:
Setting R_USER or HOME prior to calling Rgui will cause Rgui to
process ~/.Renviron, e.g.
C:\User\alice> set R_USER=%UserProfile%\Documents
C:\User\alice> Rgui
The background for finding this is R-help thread '[R] tempdir() does
not respect TMPDIR' on 2020-08-29
(https://stat.ethz.ch/pipermail/r-help/2020-August/468573.html).
/Henrik
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