[Bugs] [Bug 1297862] New: Ganesha hook script executes showmount and causes a hang

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1297862

            Bug ID: 1297862
           Summary: Ganesha hook script executes showmount and causes a
                    hang
           Product: GlusterFS
           Version: 3.7.7
         Component: ganesha-nfs
          Keywords: Triaged
          Assignee: ndevos at redhat.com
          Reporter: ndevos at redhat.com
                CC: bugs at gluster.org
        Depends On: 1294446



+++ This bug was initially created as a clone of Bug #1294446 +++
+++                                                           +++
+++ Use this bug to backport the fix to release 3.7.          +++

Description of problem:
When rpcbind is not running on the server (or is firewalled), and a Gluster
volume is started (after create or stop), a hook script calls 'showmount' and
hangs.

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

How reproducible:
100%

Steps to Reproduce (from memory):
1. stop the rpcbind service (also rpcbind.sock on systemd based installations)
2. create a volume
3. set the 'ganesha.enable' volume option
4. start the volume

Actual results:
The 'gluster volume star ...' command hangs, 

Expected results:
No hang.

Additional info:
The cause seems to be the 'S31ganesha-start.sh' hook script. Instead of
'showmount', an equivalent dbus command could be used.

--- Additional comment from Vijay Bellur on 2015-12-28 10:40:26 CET ---

REVIEW: http://review.gluster.org/13098 (scripts: prevent running 'showmount'
from the start/post hook script) posted (#1) for review on master by Niels de
Vos (ndevos at redhat.com)

--- Additional comment from Niels de Vos on 2015-12-28 10:54:58 CET ---

(In reply to Niels de Vos from comment #0)
...
> Steps to Reproduce (from memory):
> 1. stop the rpcbind service (also rpcbind.sock on systemd based
> installations)
> 2. create a volume
> 3. set the 'ganesha.enable' volume option
> 4. start the volume

It does not seem to be required to set the 'ganesha.enable' volume option. The
'showmount' command that hangs, is executed before this option is checked.

--- Additional comment from Vijay Bellur on 2016-01-12 16:38:35 CET ---

COMMIT: http://review.gluster.org/13098 committed in master by Kaleb KEITHLEY
(kkeithle at redhat.com) 
------
commit 2b2294d2a4ef221fccb6eb9f74e9b7dc233b9f1d
Author: Niels de Vos <ndevos at redhat.com>
Date:   Mon Dec 28 10:26:20 2015 +0100

    scripts: prevent running 'showmount' from the start/post hook script

    The 31ganesha-start.sh hook script tries to run 'showmount' to see if
    the volume that is getting started should get exported by NFS-Ganesha.
    It was reported that this caused the 'gluster volume start ...' command
    to hang in case rpcbind is not running.

    Instead of running 'showmount', we can use DBus to contact NFS-Ganesha
    directly, and request the available exports. This will immediately fail
    in case NFS-Ganesha is not running.

    BUG: 1294446
    Change-Id: I3aba1f86fead67116ca5adb1864a8be626c334fa
    Reported-by: Jeff Darcy <jdarcy at redhat.com>
    Signed-off-by: Niels de Vos <ndevos at redhat.com>
    Reviewed-on: http://review.gluster.org/13098
    Tested-by: Raghavendra Talur <rtalur at redhat.com>
    Reviewed-by: jiffin tony Thottan <jthottan at redhat.com>
    Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1294446
[Bug 1294446] Ganesha hook script executes showmount and causes a hang
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