Oops, I should not send mails that have a single dot in a line. :)

Roland Illig wrote:
> Christoph Badura wrote:
> 
>> On Mon, Jan 08, 2007 at 01:40:23AM +0000, Roland Illig wrote:
>>
>>> Modified Files:
>>>     pkgsrc/graphics/xart: Makefile
>>
>>
>>
>>> Log Message:
>>> When fixing file permissions with find | xargs, there is always a race
>>> condition. Fixed this by using find -exec for the directories.
>>
>>
>>
>> Exactly what race condition are you talking about?
> 
> 
> There have been directories that had been extracted with mode 415 (or 
> similar, at least non-executable for the user). These directories also 
> had subdirectories.
> 
> mkdir dir
> mkdir dir/subdir
> touch dir/subdir/file
> chmod 123 dir/subdir/file
> chmod 444 dir/subdir
> chmod 400 dir
> 
> When find(1) iterated over such a directory, it couldn't change to the 
> subdirectories to fix their permissions, too, because the directory was 
> still non-executable at that point.
> 
> $ find . -print
> .
> ./dir
> find: ./dir/subdir: Permission denied
> find: ./dir: Permission denied
> 
> When you add the xargs(1) pipe, and assuming that xargs runs the command 
> for every single argument, there can still be the case that find(1) 
> tries to change to the directory before xargs(1) has managed to run 
> chmod on it.

Roland