[Python-ideas] shutil.symlink to allow non-race replacement of existing link targets

[Antoine Pitrou]

On Thu, 16 May 2019 16:04:36 +0300
Serhiy Storchaka <storchaka at gmail.com>
wrote:

> 16.05.19 14:33, Antoine Pitrou пише:
> > On Thu, 16 May 2019 13:05:48 +0300
> > Serhiy Storchaka <storchaka at gmail.com>
> > wrote:  
> >> 16.05.19 11:28, Barry Scott пише:  
> >>> To replace one symlink with another atomically is possible by using rename() or renameat()
> >>> something like:
> >>>
> >>> 	os.symlink( src, tmp_symlink )
> >>> 	os.rename( tmp_symlink, dst )  
> >>
> >> Somebody can replace tmp_symlink between os.symlink() and os.rename().  
> > 
> > Not if tmp_symlink is created in a directory with strict permissions, I
> > guess.  
> 
> But in such case we do not need complex games with a temporary symlink. 
> Just use os.symlink() and os.unlink() if needed.

I was talking about the *tmp_symlink*, not *dst*.