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[ChristianEhrhardt <1718227@xxxxxxxxxxxxxxxxxx>]

Tested on chrony which has a NetworkManager dispatch script that also
works as a hook for networkd-dispatcher.

Works fine by just dropping the links for now.
Changes visible when these hooks are in place

1. when sources get unreachable it detects offlining immediately (instead of trying all the time)
2. when a network drops but sources stay reachable nothing happens (no accidental offline)
3. when sources are offline and network is attached without connecting to anything they stay offline
4. when sources are offline and a connecting network is attached they all become online immediately
5. when a network is lost that was connecting to just to some sources only those get set offline.

P.S. most of these cases can be well tested with virsh attach-device /
detach-device with multiple network cards (one that connects to network
and one that does not for example)

The biggest issue is that reusing that is very nice, but OTOH dangerous if it gets NM only code.
I'll start discussing that upstream before using it in any way.
That happened post 3.2 in
  b563048 "examples: ignore non-up/down events in nm-dispatcher script"

I'm now doing:
1. discussing upstream how we want to do it
2. bring that upstream for networkd-dispatcher
3. backport the change to Bionic chrony package
4. place the files to trigger the callbacks

-- 
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https://bugs.launchpad.net/bugs/1718227

Title:
  replacement of ifupdown with netplan needs integration for
  /etc/network/if{up,down}.d scripts

Status in aiccu package in Ubuntu:
  Invalid
Status in aoetools package in Ubuntu:
  New
Status in avahi package in Ubuntu:
  New
Status in bind9 package in Ubuntu:
  Invalid
Status in chrony package in Ubuntu:
  Confirmed
Status in clamav package in Ubuntu:
  Triaged
Status in controlaula package in Ubuntu:
  New
Status in epoptes package in Ubuntu:
  New
Status in ethtool package in Ubuntu:
  New
Status in guidedog package in Ubuntu:
  New
Status in htpdate package in Ubuntu:
  New
Status in ifenslave package in Ubuntu:
  Won't Fix
Status in ifmetric package in Ubuntu:
  Won't Fix
Status in ifupdown-multi package in Ubuntu:
  New
Status in ifupdown-scripts-zg2 package in Ubuntu:
  Invalid
Status in isatapd package in Ubuntu:
  New
Status in lprng package in Ubuntu:
  New
Status in miredo package in Ubuntu:
  New
Status in mythtv package in Ubuntu:
  New
Status in nplan package in Ubuntu:
  New
Status in nss-pam-ldapd package in Ubuntu:
  New
Status in ntp package in Ubuntu:
  New
Status in openntpd package in Ubuntu:
  New
Status in openresolv package in Ubuntu:
  Won't Fix
Status in openssh package in Ubuntu:
  New
Status in openvpn package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  New
Status in postfix package in Ubuntu:
  New
Status in quicktun package in Ubuntu:
  New
Status in resolvconf package in Ubuntu:
  New
Status in sendmail package in Ubuntu:
  New
Status in shorewall-init package in Ubuntu:
  New
Status in sidedoor package in Ubuntu:
  New
Status in slrn package in Ubuntu:
  New
Status in tinc package in Ubuntu:
  New
Status in ubuntu-fan package in Ubuntu:
  Fix Released
Status in ucarp package in Ubuntu:
  New
Status in uml-utilities package in Ubuntu:
  New
Status in uruk package in Ubuntu:
  New
Status in vlan package in Ubuntu:
  Won't Fix
Status in vzctl package in Ubuntu:
  Triaged
Status in wide-dhcpv6 package in Ubuntu:
  New
Status in wpa package in Ubuntu:
  New

Bug description:
  when network is configured with ifupdown, scripts in
  /etc/network/ifup.d/ were called on network being brought up and
  /etc/network/ifdown.d were called on network being brought down.

  Any packages that shipped these hooks need to be verified to have the
  same functionality under a netplan configured system.

  # binpkgs=$(apt-file search /etc/network/if-up | sed 's,: .*,,' | sort -u)
  # for i in $binpkgs; do
    src=$(apt-cache show $i | awk '$1 == "Source:" { print $2; exit(0); }');
    [ -z "$src" ] && src="$i"; echo $src; done | sort -u

  aiccu
  aoetools
  avahi
  bind9
  chrony
  clamav
  controlaula
  epoptes
  ethtool
  guidedog
  htpdate
  ifenslave
  ifmetric
  ifupdown-extra
  ifupdown-multi
  ifupdown-scripts-zg2
  isatapd
  lprng
  miredo
  mythtv-backend
  nss-pam-ldapd
  ntp
  openntpd
  openresolv
  openssh
  openvpn
  postfix
  quicktun
  resolvconf
  sendmail
  shorewall-init
  sidedoor
  slrn
  tinc
  ubuntu-fan
  ucarp
  uml-utilities
  uruk
  vlan
  vzctl
  wide-dhcpv6
  wpa

  
  Related bugs:
   * bug 1718227: replacement of ifupdown with netplan needs integration for /etc/network/if{up,down}.d scripts 
   * bug 1713803: replacement of resolvconf with systemd needs integration 
   * bug 1717983: replacement of isc-dhcp-client with with systemd-networkd for dhclient needs integration

  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: netplan (not installed)
  ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
  Uname: Linux 4.12.0-11-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue Sep 19 10:53:08 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (789 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: plan
  UpgradeStatus: No upgrade log present (probably fresh install)

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