Hello! On Sat, May 24, 2008 at 10:44:21PM +0100, Samuel Thibault wrote: > It's quite common to see code that calls test -x to check whether the x > bit was disabled on a file, before trying to execute it. > > That does not work on the Hurd for uid 0: > > # touch foo > # ls -l foo > -rw-r--r-- 1 root root 0 May 24 21:31 foo > # [ -x foo ] && echo erf > erf > # ./foo > -bash: ./foo: Permission denied > > because in fshelp_access(), as soon as user->uids contains 0, everything > is permitted, thus making access() always return X_OK... > > What POSIX says is `New implementations are discouraged from returning > X_OK unless at least one execution permission bit is set.' > > Now, I can not remember about executability in the Hurd: can it happen > that something -x may actually be executable? If not, shouldn't we > change our behavior?
I say we should do here what other POSIX systems use. No need to be special, in my opinion. I'll change this (or Samuel does) unless somebody objects, OK? Regards, Thomas
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