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Description of problem:
Gnome fails when postlogin script exits with status 1

Version-Release number of selected component (if applicable):
- current

How reproducible:
verified by frontline support

Steps to Reproduce:
1. create /etc/gdm/PostLogin/Default
2. add the line 'exit 1'
3. save changes, make the Default file executable
4. Restart GDM 
5. Attempt GUI login
6. Observe

Actual results:
- Gnome hangs

Expected results:
- Gnome should start normally

Additional info:
- Gnome should not fail when the post login script fails. 
- No errors in debug output when Gnome debugging is enabled

Expected results should be changed to:

- Gnome restarts login process

(In reply to Joel Huddleson from comment #2)
> Expected results should be changed to:
> 
> - Gnome restarts login process

Incidentally, this expected result *is* the documented behavior for GNOME3.

So the behavior changed a bit in RHEL 7.2 since we've rebased to newer GDM.  We no longer hang, but there is still a show stopping problem.

Namely, the login screen in RHEL 7 is not capable of showing windows (including windows created by zenity).

I think the best option is to move the PostLogin/PreSession scripts to get run after the login screen is torn down, immediately before forking to start the session.

With the script added, the log in process is restarted and does not hang on gdm-3.14.2-18.el7.

Verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2451.html