[Bug 1570142] Re: net-interface-handler needs updating for newer ifupdown

[Scott Moser]

Marking this fix-released.
I'm 98% certain its no longer a problem on xenial.
I'm 100% certain its not a problem on zesty.
I'm 100% certain that the fix does not apply to artful (with netplan).


** Changed in: open-iscsi (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1570142

Title:
  net-interface-handler needs updating for newer ifupdown

Status in open-iscsi package in Ubuntu:
  Fix Released

Bug description:
  newer ifupdown versions (those in xenial) now keep interface state in
  /run/network/ifstate.<interfacename> rather than combined in
  /run/network/ifstate .

  We need to update /lib/open-iscsi/net-interface-handler to write the
  interface name into /run/network/ifstate.<interfacename> and then also
  tear that down on down.

  The failure can be seen when booting a maas image, if you first move the included symlink out of the way:
  p="/etc/network/interfaces";
   [ -e "$p.link" -o -L "$p.link" ] || mv "$p" "$p.link"; cp "$p.dist" "$p"

  (maas images ship with /etc/network/interfaces as a symlink to ../../run/network/dynamic-interfaces
  and /run/network/dynamic-interfaces is populated by cloud-initramfs-dyn-netconf).

  This affects:
    * cloud-init: cloud-init's fallback config currently writes 'auto' for the network device. the cloud-initramfs-dyn-netconf writes 'manual', and so ifupdown doesn't try to bring up *or* down the device.
    * maas-images: the single difference from filesystem viewpoint from xenial lxd image to maas image is 'ln -snf ../../run/dynamic-interfaces /etc/network/interfaces'
    * open-iscsi: the real need for open-iscsi's udev integration is to get the resolvconf updates applied.

  Related bugs:
   * bug 1568637:  network config of initramfs devices writes 'auto', breaking iscsi root boot 

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: open-iscsi 2.0.873+git0.3b4b4500-14ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Wed Apr 13 23:58:27 2016
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
  SourcePackage: open-iscsi
  UpgradeStatus: No upgrade log present (probably fresh install)

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