[Users] Problem with clawsrc occasionally reverting to default

Michael Schwendt bugreporter at abwesend.de
Thu Mar 26 15:07:43 CET 2015

On Thu, 26 Mar 2015 14:18:11 +0100, Paul Rolland (ポール・ロラン) wrote:

> > > So what is the situation that leaves you with *no* clawsrc and a
> > > clawsrc.tmp in the ~/.claws-mail folder ?
> > 
> > Since I won't be able to skim over the source code until possibly end
> > of next week, here are just my thoughts:
> > 
> > Preferably, it would create a _new_ clawsrc.tmp file and write
> > everything to that file, and when done, it would create a backup of
> > the existing clawrc and then rename(3) clawsrc.tmp to clawsrc.
> > If Claws Mail gets interrupted/killed prior to the final renaming
> > step, the old clawsrc file would still be present.
> I've just been looking very briefly at the code, and it looks like this is
> what's done...

I've just had a look. It doesn't do that.

It's vulnerable to race-conditions while being killed, because in
prefs_file_close() it

 1) _renames_ clawsrc to clawsrc.bak
 2) _renames_ clawsrc.tmp to clawsrc

Between 1) and 2) there is no clawsrc file anymore as two separate rename
calls are not atomic. IMO, it ought to copy in step 1.


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