On 08/27/2014 09:15 AM, Achim Gratz wrote: > Ken Brown <kbrown <at> cornell.edu> writes: >> Achim, could you send me a recipe for reproducing the problem so that I >> can test further? Please be very detailed; I have no experience with ACLs. > > Let's get one issue out of the way first that may be a Cygwin bug: on Linux > a file with all access removed via standard POSIX modes and then access > granted via ACL would place the mask bits of the ACL (the maximum permission > that can be granted via ACL, usually rwx) into the group portion of the > POSIX modes (ls --color would even show these in different color if you > didn't happen to notice the "+"). That doesn't happen on Cygwin and it > seems that some software optimizes based on that information to not traverse > the ACL when there's no chance to ever get a permission granted. This > behaviour is mandated by POSIX IIUC (and it is what Linux is doing) so > unless Cygwin explicitly follows a different ACL model, I think that should > be taken care of before diving into this further.
Sadly, POSIX doesn't mandate ACLs (in part because there are so many differing implementations that it was impossible to standardize a common ground). So code using ACLs across multiple platforms has to deal with quirks, and although gnulib attempts to do so, it may be a shortcoming in the gnulib wrappers that emacs is using. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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