Hi,

I just noticed that Sage unconditionally changes the permissions of the 
DOT_SAGE directory to rwx--- even after the user manually modified them
(sage/misc/misc.py, l. 92ff). It seems to me however that there are 
perfectly valid reasons to share one's .sage with other users. Worse, 
Sage crashes if the attempt to set the permissions fails (try chattr +i 
~/.sage).

Despite some comments in the code, I don't understand how people got to 
the idea of fiddling with these permissions in the first place, so I'm 
not sure how to fix the issue. Any opinions?

Thanks,

-- 
Marc

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