I can't see from the changelogs what this was meant to fix, but users
already have methods of disabling nfsd if they don't want it to start,
so this change in behaviour doesn't seem to be necessary, and breaks
expected behaviour.

I can see two ways of solving this, either by simply deleting the  `grep
-q '^[[:space:]]*[^#]*/' $export_files` test (preferable since it
restores expected behaviour), or by introducing an additional switch in
/etc/default/nfs-kernel-server to control whether nfsd is started with
empty exports (this could default to on to restore expected behaviour,
but this still seems superfluous, since the user can simply disable the
init job using existing mechanisms).

** Description changed:

  Since the following change:
  
  --- a/debian/nfs-kernel-server.init        2012-09-18 11:03:38.389491693 +1000
  +++ b/debian/nfs-kernel-server.init       2012-09-18 10:54:36.317492001 +1000
  @@ -61,7 +61,13 @@
-  # See how we were called.
-  case "$1" in
-    start)
+  # See how we were called.
+  case "$1" in
+    start)
  -       if [ -f /etc/exports ]
  +       export_files="/etc/exports"
  +       for file in /etc/exports.d/*.exports ; do
  +               if [ -f "$file" ]; then
  +                       export_files="$export_files $file"
  +               fi
  +       done
  +       if [ -f /etc/exports ] && grep -q '^[[:space:]]*[^#]*/' $export_files
-         then
-                 do_modprobe nfsd
-  
- It is no longer possible to start nfsd without content in /etc/exports, 
making it impossible to create temporary exports (ie - using exportfs) if the 
host does not have permanent exports.  This also breaks other alternative 
management tools that eschew /etc/exports, like ZFS.
+         then
+                 do_modprobe nfsd
+ 
+ It is no longer possible to start nfsd without content in /etc/exports
+ (or /etc/exports.d/*), making it impossible to create temporary exports
+ (ie - using exportfs) if the host does not have permanent exports.  This
+ also breaks other alternative management tools that eschew /etc/exports,
+ like ZFS.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: nfs-kernel-server 1:1.2.6-3ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-14.19-generic 3.5.3
  Uname: Linux 3.5.0-14-generic x86_64
  NonfreeKernelModules: zfs zcommon znvpair zavl zunicode
  ApportVersion: 2.5.2-0ubuntu1
  Architecture: amd64
  Date: Tue Sep 18 10:47:08 2012
  InstallationMedia: Ubuntu-Server 12.10 "Quantal Quetzal" - Alpha amd64 
(20120903.2)
  ProcEnviron:
-  LANGUAGE=en_AU:en
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  LANG=en_AU.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_AU:en
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  LANG=en_AU.UTF-8
+  SHELL=/bin/bash
  SourcePackage: nfs-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1052264

Title:
  nfsd won't start unless exports has content

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