Re: Bugreport on Ubuntu LTS: not ok - 2 Objects creation does not break ACLs with restrictive umask

On Tue, Jun 05, 2012 at 09:31:54AM -0700, Junio C Hamano wrote:

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  setfacl -m m:rwx .
  perl -MFcntl -e 'sysopen(X, "a", O_WRONLY|O_CREAT, 0444)'
  umask 077
  perl -MFcntl -e 'sysopen(X, "b", O_WRONLY|O_CREAT, 0444)'
  getfacl a b

[...]

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Reading the withdrawn posix 1003.1e and "man 5 acl", it seems pretty
clear that if a default ACL is present, it should be used, and umask
consulted only if it is not (so the umask should not be making a
difference in this case).

The reproduction recipe above shows the minimum required to trigger it;
adding a more realistic default ACL (with actual entries for users) does
not seem to make a difference.

Thanks; so combining the above with your earlier patch to 1304 we
would have a good detection for SETFACL prerequisite?

Yes, I think we can detect it reliably. I'd like to hear back from
ecryptfs folks before making a final patch, though. It may be that there
is some subtle reason for their behavior, and I want to make sure before
we write it off as just buggy.

-Peff