[Rd] system2 fails with quiet=TRUE, but runs through with quiet=FALSE
JARauh at web.de
Tue Dec 6 16:28:32 CET 2016
I have recently tried to check the test coverage using library("covr") and, interestingly, the command
> covr::package_coverage(quiet = FALSE)
runs through without problem. I traced the problem to a call to utils::install.packages(), where the option quiet is passed on. In utils::install.packages(), the problem seems to lie in the following call of system2():
output <- if (quiet)
FALSE else ""
status <- system2(cmd0, args, env = env, stdout = output,
stderr = output)
Manually changing stdout to "" makes the program run through without error (but then the output is there again, of course...).
The function system2 seems to be a wrapper around
.Internal(system(command, flags, f, stdout, stderr))
In this call, if quiet = TRUE, then flags <- 21, otherwise flags <- 22. stdout and stderr are passed through from system2.
I should mention that I am working with R 3.3.1 on Windows 8.
Does anyone have an idea what the flags mean and how they can make a system call fail?
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