Bug#730177: There are two bugs - in glib and gnome-shell

[John Hughes]

It seems to me that we have a classic situation of two bugs conspiring 
to ruin our day.

1. For some strange reason glib decides not to tell people about EACCES 
when they ask for information about a file/directory

2. gnome-shell thinks that just because glib provides it information 
about a directorty (from an lstat) it can read that directory.

We can tickle the second bug by doing something as simple as:

# mkdir -p /usr/local/share/gnome-shell/modes
# chmod -rx /usr/local/share/gnome-shell/modes


Bam!  next time gdm3 is started no greeter is displayed.