[sshfs] Wrong permissions returned in access() call

[Alkis G. <al...@gm...>]

Hi, SSHFS returns "writeable, executable" even for files that lack those
attributes:

$ mkdir /tmp/etc
$ sshfs localhost:/etc /tmp/etc

$ strace gvfs-info /etc/login.defs 2>&1 | grep '^access.*login.defs'
access("/etc/login.defs", R_OK)         = 0
access("/etc/login.defs", W_OK)         = -1 EACCES (Permission denied)
access("/etc/login.defs", X_OK)         = -1 EACCES (Permission denied)

$ strace gvfs-info /tmp/etc/login.defs 2>&1 | grep '^access.*login.defs'
access("/tmp/etc/login.defs", R_OK)     = 0
access("/tmp/etc/login.defs", W_OK)     = 0
access("/tmp/etc/login.defs", X_OK)     = 0


This e.g. makes nautilus try to execute text files on sshfs mounts:
https://bugzilla.gnome.org/show_bug.cgi?id=679187
https://bugs.launchpad.net/ubuntu/+source/sshfs-fuse/+bug/1017870