[Bugs-r-devel] FW: Mac bug regressions

[Gorjanc G. <Gre...@bf...>]

...
>>> As we can see from the log, the model file cannot be opened.  This is
>>> because the directory RtmpmMFxxp has the restrictive permissions 700.
>>> This naming convention looks like R created this directory.  If so,
>>> then can we have R make the permissions 755?  If not, then maybe we
>>> should be using C:\windows\temp since it has the right permissions
>>> to begin with.
>>>
>>
>> Are you sure about this? If you use working.directory="." then model file should be written in
>> current working directory and not in the temporary folder created by R.
>>
>> I looked in ?tempdir() and there is no sign that we could modify permissions. I did not check the
>> permissions on linux, but I find it odd that 700 does not allow WinBUGS to open the file. Afterall,
>> 700 should mean that all permissions are granted to the user (owner) of the file, which is the user
>> who started R and subsequently WinBUGS via wine.
>
> I'm sure. Actually, it does not mean that. It means, another process
> with your user id AND group id can access those files. But, the group
> id of the Wine processes and children is different. Therefore, it
> cannot access those files. That's why nobody uses 700 (except for
> something like ~/.ssh), but 755 and 750 are quite common. So, it's
> a bug.

Then this seems to be Mac specific, since I tested the new behaviour with
tempdir() on linux, before I committed last changes. It worked without permission
problems on linux. I checked and yes, tempdir() creates a directory with 700 permissions.

gg