[Pkg-zfsonlinux-devel] Bug#975873: Please hook zfs-share up to nfs-kernel-server stop+start

[Trent W. Buck]

Package: zfsutils-linux
Version: 0.8.4-1~bpo10+1
Severity: minor

I'm not sure who is 'at fault' here, or where the fix belongs.

The problem I ran into was this:

  1. I zfs set sharenfs (not /etc/exports), because
     it makes config management a little easier (exports(5) lacks a "drop-in" dir).

  2. During an apt update, needrestart asks to restart NFS.

  3. I tell needrestart "sure, go ahead".

  4. All my NFS exports are gone!

I can reproduce the symptoms with stop+start, but not restart:

    root at odin:~# exportfs -s
    /srv/old-disks  goll.lan(ro,async,wdelay,root_squash,no_subtree_check,mountpoint,sec=sys,ro,secure,root_squash,no_all_squash)
    root at odin:~# systemctl restart nfs-kernel-server
    root at odin:~# exportfs -s
    /srv/old-disks  goll.lan(ro,async,wdelay,root_squash,no_subtree_check,mountpoint,sec=sys,ro,secure,root_squash,no_all_squash)
    root at odin:~# systemctl stop nfs-kernel-server
    root at odin:~# systemctl start nfs-kernel-server
    root at odin:~# exportfs -s
    [UH OH, PROBLEM!]
    root at odin:~# zfs share -a
    root at odin:~# exportfs -s
    /srv/old-disks  goll.lan(ro,async,wdelay,root_squash,no_subtree_check,mountpoint,sec=sys,ro,secure,root_squash,no_all_squash)

Can ZFS hook NFS, or vice-versa, so this problem flow stops happening?
This has already bitten me twice! :-(