Greetings, Charles Plager! > Short version: When writing to network drives (and probably local > ones) as Cygwin is setup by default, we see the permissions being set > using the ACLs where "creator owner" is given "full control" and > "creator" group are given "read/execute", but by setting "special > permissions" instead of just having "full control" or "read/execute" > set.
> Why does it not just set "full control" or "read/execute"? Cygwin by default mimicking POSIX permission set. If this behavior is undesirable, You can work around it by letting operating system control the ACL. Modify cygdrive entry in /etc/fstab to include noacl option. Then any files accessed outside direct/implied mounts will have permissions controlled by OS. > Long, slightly different version: When the above permissions get set, > we sometimes see (sometimes = 1 file in a million or less) a file that > ends up with no permissions. Owner loses permissions, admin loses > permissions and so far, IT has only been able to make the file go away > by reformatting the drive. > When we tell Cygwin not to use ACLs (adding the following in > /etc/fstab), this does not seem to happen (in 100 million or so files > created). > none /cygdrive/ cygdrive binary,posix=0,user,noacl 0 0 > This only seems to happen for files created by Cygwin with the ACL > permissions (although, to be fair, without Cygwin, I don't know that > anybody is generating as many files). I'm assuming it isn't Cygwin, > per say, but rather something that interacts with how Cygwin setup the > permissions (and given the rarity of the problem it is difficult to > diagnose more thoroughly. > So, to sum up: > * Why use special permissions and not default settings when using ACLs? > * Anybody else experience files that lose all permissions? Any > suggestions on resetting the file (short of reformatting the drive)? > * Any other hints/insights that might be useful here? > Thanks, > Charles > p.s. We see this behavior for Cygwin 1.7.9 and beyond. In 1.7.5, it > doesn't appear as if the ACLs are used and it acts as if "noacl" is > set. -- WBR, Andrey Repin (anrdae...@yandex.ru) 11.03.2014, <16:08> Sorry for my terrible english... -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
