On 07/12/2012 10:23 AM, Stefano Lattarini wrote: >> Other than that, the only supported method in existing POSIX for >> checking for equal files is by parsing 'ls -i' output; but I don't know >> if 'ls -i' is portable to ancient hosts. >> > I was fearing this would have got quickly complex and messy ... > > So I think I'll stick to my dumber and safer "test -f /bin/RMDIR" as a > way to detect case-insensible filesystems.
Assuming it was intentional, I like your re-wording of "case-insensible", as an apt description of the pain case-insensitive systems cause on portability :) That said, /bin/RMDIR is probably completely portable, but seems like it would be reliable in practice. POSIX doesn't reqiure /bin/rmdir to exist (about the only files that you can guarantee with POSIX are /tmp, /dev/null, /dev/tty, and /dev/console). Since /dev/ generally doesn't exist on mingw, that almost limits you to just testing if /tmp and /TMP are the same directory to detect a case-insensitive system. But I don't know of any systems that lack /bin/rmdir on a default installation, nor do I suspect many users intentionally create /bin/RMDIR (or even better, /bIn/rMdIr), so using it as a hueristic seems okay for a first cut at the problem at hand. Or, maybe you should just create a file in /tmp under one spelling and check existence of the file by another spelling. -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature
