According to the Linux setfacl man page, in order for an ACL to be valid,
the following rules must be satisfied:
* Whenever an ACL contains any Default ACL entries, the three Default
ACL base entries (default owner, default group, and default others)
must also exist.
* Whenever a Default ACL contains named user entries or named group
objects, it must also contain a default effective rights mask.
Some implementations of setfacl (Linux) do this automatically when
necessary, some (Solaris) do not. Solaris's setfacl croaks when trying to
create a default user ACL if the above rules are not satisfied. So, create
them before modifying the default user ACL's.
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>