Does Sys.chmod() work for you? [solved]

micro@

<br />
> Sys.info()<br />
                              sysname                               release<br />
                              "Linux"           "2.6.32-220.2.1.el6.x86_64"<br />
                              version                              nodename<br />
"#1 SMP Fri Dec 23 02:21:33 CST 2011"                             "x"<br />
                              machine                                 login<br />
                             "x86_64"                                 "x"<br />
                                 user                        effective_user<br />
                                "x"                                 "x"<br />
> sessionInfo()<br />
R version 2.15.0 (2012-03-30)<br />
Platform: x86_64-unknown-linux-gnu (64-bit)</p>
<p>locale:<br />
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C<br />
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8<br />
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8<br />
 [7] LC_PAPER=C                 LC_NAME=C<br />
 [9] LC_ADDRESS=C               LC_TELEPHONE=C<br />
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C</p>
<p>attached base packages:<br />
[1] stats     graphics  grDevices utils     datasets  methods   base</p>
<p>loaded via a namespace (and not attached):<br />
[1] tools_2.15.0<br />
> f=tempfile()<br />
> (dir.create(f))<br />
[1] TRUE<br />
> file.info(f)$mode<br />
[1] "755"<br />
> (Sys.chmod(f,'775'))<br />
[1] TRUE<br />
> file.info(f)$mode<br />
[1] "755"<br />
> (system(paste('chmod 775',f)))<br />
[1] 0<br />
> file.info(f)$mode<br />
[1] "775"<br />

Apparently, Sys.chmod did not change the mode but still returned TRUE.

I believe the code had been working in R 2.12 on the same computer.

Does anyone have the same problem?
</p>

micro@

I see. It's the umask that prevents the change.

nan.xiao

That's a bit of ... weird. Does it act like this on a Mac?

<br />
> Sys.info()<br />
                                      sysname<br />
                                      "Linux"<br />
                                      release<br />
                              "3.2.13-1-ARCH"<br />
                                      version<br />
"#1 SMP PREEMPT Sat Mar 24 09:10:39 CET 2012"<br />
...<br />
                                      machine<br />
                                     "x86_64"<br />
...<br />
> sessionInfo()<br />
R version 2.15.0 (2012-03-30)<br />
Platform: x86_64-unknown-linux-gnu (64-bit)</p>
<p>locale:<br />
 [1] LC_CTYPE=zh_CN.UTF-8       LC_NUMERIC=C<br />
 [3] LC_TIME=zh_CN.UTF-8        LC_COLLATE=zh_CN.UTF-8<br />
 [5] LC_MONETARY=zh_CN.UTF-8    LC_MESSAGES=zh_CN.UTF-8<br />
 [7] LC_PAPER=C                 LC_NAME=C<br />
 [9] LC_ADDRESS=C               LC_TELEPHONE=C<br />
[11] LC_MEASUREMENT=zh_CN.UTF-8 LC_IDENTIFICATION=C       </p>
<p>attached base packages:<br />
[1] stats     graphics  grDevices utils     datasets  methods   base<br />
> f=tempfile()<br />
> (dir.create(f))<br />
[1] TRUE<br />
> file.info(f)$mode<br />
[1] "755"<br />
> (Sys.chmod(f,'775'))<br />
[1] TRUE<br />
> file.info(f)$mode<br />
[1] "755"<br />
> (system(paste('chmod 775',f)))<br />
[1] 0<br />
> file.info(f)$mode<br />
[1] "775"<br />

</p>

micro@

The Sys.umask() turns out to be 22, which prevents adding the write permission, except to the owner.

Sys.chmod(f,'775',F) will work as before.