Executable bit check

[Illia Bobyr]

On 11/5/2010 11:56 AM, Eric Blake wrote:
> [...]
> On Linux:
>
> $ setfacl -m mask:rwx d/f
> $ getfacl d/f
> # file: d/f
> # owner: eblake
> # group: eblake
> user::rw-
> user:dummy:rwx
> group::rw-
> mask::rwx
> other::r--
>
> $ chmod -x d/f
> $ getfacl d/f
> # file: d/f
> # owner: eblake
> # group: eblake
> user::rw-
> user:dummy:rwx			#effective:rw-
> group::rwx			#effective:rw-
> mask::rw-
> other::r--
>
> Interestingly - that means that on Linux, chmod -x changed the mask
> entry of the ACLs, such that the effective permissions for the alternate
> user are no longer permitted; so even though user dummy has rwx ACLs,
> the mask prevents the user from executing the file any more.
>
> Cygwin does not emulate Linux in this regards at the moment, but now
> that you have pointed out a simple test case, it may be possible to
> patch cygwin1.dll to make the chmod() syscall affect the ACL mask as on
> Linux.

It seems that setfacl also does not change the "mask" part on Cygwin:

$ getfacl.exe abc
# file: abc
# owner: ibobyr
# group: Domain Users
user::rw-
group::r--
group:SYSTEM:rwx
group:Administrators:rwx
group:Users:r-x
mask:rwx
other:r--

$ setfacl.exe -m mask:rw- abc

$ getfacl.exe abc
# file: abc
# owner: ibobyr
# group: Domain Users
user::rw-
group::r--
group:SYSTEM:rwx
group:Administrators:rwx
group:Users:r-x
mask:rwx
other:r--

$ setfacl.exe -m mask:--- abc

$ getfacl.exe abc
# file: abc
# owner: ibobyr
# group: Domain Users
user::rw-
group::r--
group:SYSTEM:rwx
group:Administrators:rwx
group:Users:r-x
mask:rwx
other:r--