[Rd] tempdir() may be deleted during long-running R session

[Dirk Eddelbuettel]

On 26 April 2017 at 16:39, Tomas Kalibera wrote:
| I agree this should be solved in configuration of 
| systemd/tmpreaper/whatever tmp cleaner - the cleanup must be prevented 

Yep.

| in configuration files of these tools. Moving session directories under 
| /var/run (XDG_RUNTIME_DIR) does not seem like a good solution to me, 
| sooner or later someone might come with auto-cleaning that directory too.

(These days it seems /run is used too. I seem to have a screenful of things
in there.)
 
| It might still be useful if R could sometimes detect when automated 
| cleanup happened and warn the user. Perhaps a simple way could be to 
| always create an empty file inside session directory, like 
| ".tmp_cleaner_trap". R would never touch this file, but check its 
| existence time-to-time. If it gets deleted, R would issue a warning and 
| ask the user to check tmp cleaner configuration. The idea is that this 
| file will be the oldest one in the session directory, so would get 
| cleaned up first.

That's a very good third idea.

Dirk 

-- 
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