[Bug 1732883] Re: uvt-kvm wait command will never return on Trusty with a future guest using systemd such as Xenial

[Po-Hsu Lin]

** Attachment removed: "fix-wait-debdiff"
   https://bugs.launchpad.net/ubuntu/+source/uvtool/+bug/1732883/+attachment/5042252/+files/fix-wait-debdiff

** Attachment added: "fix-wait-debdiff"
   https://bugs.launchpad.net/ubuntu/+source/uvtool/+bug/1732883/+attachment/5042253/+files/fix-wait-debdiff

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Title:
  uvt-kvm wait command will never return on Trusty with a future guest
  using systemd such as Xenial

Status in uvtool package in Ubuntu:
  Fix Released
Status in uvtool source package in Trusty:
  In Progress

Bug description:
  == SRU Justification ==

  [Impact]
  * When running a newer guest (which uses systemd) on Trusty, the `uvt-kvm wait` command will never return as the tool is not aware of the newer runlevel 5 for systemd.

  [Test Case]
  Steps:
   1. Install Trusty + X-hwe kernel
   2. sudo apt-get install uvtool -y
   3. ssh-keygen -f /home/ubuntu/.ssh/id_rsa -t rsa -N ''
   4. sudo uvt-simplestreams-libvirt sync release=xenial arch=amd64
   5. sudo uvt-kvm create test-kvm release=xenial arch=amd64
   6. sudo uvt-kvm wait test-kvm --insecure

  Result:
   * Step no 6. will never return. Even you can already ssh into that KVM

  [Regression potential]
  * This patch only adds compatibility for Trusty users, and limited to the uvt-kvm wait command on Trusty, therefore the risk for causing a regression is low.
  * This patch has been tested on Trusty, with positive test result.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.4.0-98-generic 4.4.0-98.121~14.04.1
  ProcVersionSignature: User Name 4.4.0-98.121~14.04.1-generic 4.4.90
  Uname: Linux 4.4.0-98-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.25
  Architecture: amd64
  Date: Fri Nov 17 10:13:10 2017
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-xenial
  UpgradeStatus: No upgrade log present (probably fresh install)

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