[Bug 1766126] [NEW] exportfs always returns success status

[amk]

Public bug reported:

It is impossible to determine whether exportfs command failed or
succeeded based on the exit status:

root at ver:~# exportfs asdf ; echo $?
exportfs: Invalid exporting option: asdf
0

user at ver:~$ exportfs ; echo $?
exportfs: could not open /var/lib/nfs/.etab.lock for locking: errno 13 (Permission denied)
0

Search did not reveal a duplicate bug but a similar issue was resolved upstream back in 2013:
https://bugzilla.redhat.com/show_bug.cgi?id=966237

root at ver:~# lsb_release -rd
Description:	Ubuntu 16.04.4 LTS
Release:	16.04

root at ver:~# apt-cache policy nfs-utils
N: Unable to locate package nfs-utils
root at ver:~# apt-cache policy nfs-kernel-server
nfs-kernel-server:
  Installed: 1:1.2.8-9ubuntu12.1
  Candidate: 1:1.2.8-9ubuntu12.1

What is expected to happen: Command exits with status = 0 only in case
of successful execution

What happens instead: Command exit status is 0 regardless of outcome.

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1766126

Title:
  exportfs always returns success status

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  It is impossible to determine whether exportfs command failed or
  succeeded based on the exit status:

  root at ver:~# exportfs asdf ; echo $?
  exportfs: Invalid exporting option: asdf
  0

  user at ver:~$ exportfs ; echo $?
  exportfs: could not open /var/lib/nfs/.etab.lock for locking: errno 13 (Permission denied)
  0

  Search did not reveal a duplicate bug but a similar issue was resolved upstream back in 2013:
  https://bugzilla.redhat.com/show_bug.cgi?id=966237

  root at ver:~# lsb_release -rd
  Description:	Ubuntu 16.04.4 LTS
  Release:	16.04

  root at ver:~# apt-cache policy nfs-utils
  N: Unable to locate package nfs-utils
  root at ver:~# apt-cache policy nfs-kernel-server
  nfs-kernel-server:
    Installed: 1:1.2.8-9ubuntu12.1
    Candidate: 1:1.2.8-9ubuntu12.1

  What is expected to happen: Command exits with status = 0 only in case
  of successful execution

  What happens instead: Command exit status is 0 regardless of outcome.

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