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[Launchpad Bug Tracker <1724951@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
17.1-27-geb292c18-0ubuntu1~16.04.1

---------------
cloud-init (17.1-27-geb292c18-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * New upstream snapshot.
    - EC2: Limit network config to fallback nic, fix local-ipv4 only
      instances. (LP: #1728152)
    - Gentoo: Use "rc-service" rather than "service". [Carlos Konstanski]

cloud-init (17.1-25-g17a15f9e-0ubuntu1~16.04.1) xenial-proposed;
urgency=medium

  * New upstream snapshot.
    - resizefs: Fix regression when system booted with root=PARTUUID=
      (LP: #1725067)
    - tools: make yum package installation more reliable
    - citest: fix remaining warnings raised by integration tests.
    - citest: show the class actual class name in results.
    - ntp: fix config module schema to allow empty ntp config
      (LP: #1724951)
    - tools: disable fastestmirror if using proxy [Joshua Powers]

cloud-init (17.1-18-gd4f70470-0ubuntu1~16.04.2) xenial-proposed;
urgency=medium

  * cherry-pick 41152f1: schema: Log debug instead of warning when
    jsonschema is absent (LP: #1724354)

cloud-init (17.1-18-gd4f70470-0ubuntu1~16.04.1) xenial-proposed;
urgency=medium

  * drop the following cherry picks, now incorporated in snapshot.
    + debian/patches/cpick-a2f8ce9c-Do-not-provide-systemd-fsck-drop...
  * debian/copyright: dep5 updates, reorganize, add Apache 2.0 license.
    (LP: #1718681)
  * debian/control: drop dependency on python3-prettytable
  * debian/rules: install rsyslog file with 0644 mode instead of 0755.
  * debian/rules, debian/apport-launcher.py: add an apport hook. (LP: #1607345)
  * New upstream snapshot. (LP: #1721847)
    - simpletable: Fix get_string method to return table-formatted string
    - net: Handle bridge stp values of 0 and convert to boolean type
      [Chad Smith]
    - tools: Give specific --abbrev=8 to "git describe"
    - network: bridge_stp value not always correct [Ryan Harper]
    - tests: re-enable tox with nocloud-kvm support [Joshua Powers]
    - systemd: remove limit on tasks created by cloud-init-final.service.
      [Robert Schweikert]
    - suse: Support addition of zypper repos via cloud-config.
      [Robert Schweikert]
    - tests: Combine integration configs and testcases [Joshua Powers]
    - Azure, CloudStack: Support reading dhcp options from systemd-networkd.
      [Dimitri John Ledkov]
    - packages/debian/copyright: remove mention of boto and MIT license
    - systemd: only mention Before=apt-daily.service on debian based distros.
      [Robert Schweikert]
    - Add missing simpletable and simpletable tests for failed merge
      [Chad Smith]
    - Remove prettytable dependency, introduce simpletable [Andrew Jorgensen]
    - debian/copyright: dep5 updates, reorganize, add Apache 2.0 license.
      [Joshua Powers]
    - tests: remove dependency on shlex [Joshua Powers]
    - AltCloud: Trust PATH for udevadm and modprobe.
    - DataSourceOVF: use util.find_devs_with(TYPE=iso9660)
      [Ryan Harper]
    - tests: remove a temp file used in bootcmd tests.
    - release 17.1
    - doc: document GCE datasource. [Arnd Hannemann]
    - suse: updates to templates to support openSUSE and SLES.
      [Robert Schweikert]
    - suse: Copy sysvinit files from redhat with slight changes.
      [Robert Schweikert]
    - docs: fix sphinx module schema documentation [Chad Smith]
    - tests: Add cloudinit package to all test targets [Chad Smith]
    - Makefile: No longer look for yaml files in obsolete ./bin/.
    - tests: fix ds-identify unit tests to set EC2_STRICT_ID_DEFAULT.
    - ec2: Fix maybe_perform_dhcp_discovery to use /var/tmp as a tmpdir
      [Chad Smith]
    - Azure: wait longer for SSH pub keys to arrive.
      [Paul Meyer]
    - GCE: Fix usage of user-data.
    - cmdline: add collect-logs subcommand. [Chad Smith]
    - CloudStack: consider dhclient lease files named with a hyphen.
    - resizefs: Drop check for read-only device file, do not warn on
      overlayroot. [Chad Smith]
    - tests: Enable the NoCloud KVM platform [Joshua Powers]
    - resizefs: pass mount point to xfs_growfs [Dusty Mabe]
    - vmware: Enable nics before sending the SUCCESS event. [Sankar Tanguturi]
    - cloud-config modules: honor distros definitions in each module
      [Chad Smith]
    - chef: Add option to pin chef omnibus install version
      [Ethan Apodaca]
    - tests: execute: support command as string [Joshua Powers]
    - schema and docs: Add jsonschema to resizefs and bootcmd modules
      [Chad Smith]
    - tools: Add xkvm script, wrapper around qemu-system [Joshua Powers]
    - vmware customization: return network config format
      [Sankar Tanguturi]
    - Ec2: only attempt to operate at local mode on known platforms.
    - Use /run/cloud-init for tempfile operations.
    - ds-identify: Make OpenStack return maybe on arch other than intel.
    - tests: mock missed openstack metadata uri network_data.json
      [Chad Smith]
    - relocate tests/unittests/helpers.py to cloudinit/tests
      [Lars Kellogg-Stedman]
    - tox: add nose timer output [Joshua Powers]
    - upstart: do not package upstart jobs, drop ubuntu-init-switch module.
    - tests: Stop leaking calls through unmocked metadata addresses
      [Chad Smith]
    - distro: allow distro to specify a default locale [Ryan Harper]
    - tests: fix two recently added tests for sles distro.
    - url_helper: dynamically import oauthlib import from inside oauth_headers
      [Chad Smith]
    - tox: make xenial environment run with python3.6
    - suse: Add support for openSUSE and return SLES to a working state.
      [Robert Schweikert]
    - GCE: Add a main to the GCE Datasource.
    - ec2: Add IPv6 dhcp support to Ec2DataSource. [Chad Smith]
    - url_helper: fail gracefully if oauthlib is not available
      [Lars Kellogg-Stedman]
    - cloud-init analyze: fix issues running under python 2. [Andrew Jorgensen]
    - Configure logging module to always use UTC time.
      [Ryan Harper]
    - Log a helpful message if a user script does not include shebang.
      [Andrew Jorgensen]
    - cli: Fix command line parsing of coniditionally loaded subcommands.
      [Chad Smith]
    - doc: Explain error behavior in user data include file format.
      [Jason Butz]
    - cc_landscape & cc_puppet: Fix six.StringIO use in writing configs
      [Chad Smith]
    - schema cli: Add schema subcommand to cloud-init cli and cc_runcmd schema
      [Chad Smith]
    - Debian: Remove non-free repositories from apt sources template.
      [Joonas Kylmälä]
    - tools: Add tooling for basic cloud-init performance analysis.
      [Chad Smith]
    - network: add v2 passthrough and fix parsing v2 config with bonds/bridge
      params [Ryan Harper]
    - doc: update capabilities with features available, link doc reference,
      cli example [Ryan Harper]
    - vcloud directory: Guest Customization support for passwords
      [Maitreyee Saikia]
    - ec2: Allow Ec2 to run in init-local using dhclient in a sandbox.
      [Chad Smith]
    - cc_ntp: fallback on timesyncd configuration if ntp is not installable
      [Ryan Harper]
    - net: Reduce duplicate code. Have get_interfaces_by_mac use
      get_interfaces.
    - tests: Fix build tree integration tests [Joshua Powers]
    - sysconfig: Dont repeat header when rendering resolv.conf
      [Ryan Harper]
    - archlinux: Fix bug with empty dns, do not render 'lo' devices.

 -- Chad Smith <chad.smith@xxxxxxxxxxxxx>  Tue, 31 Oct 2017 13:10:51
-0600

** Changed in: cloud-init (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1724951

Title:
  Ntp schema definition permits empty ntp cloud-config, but code
  disallows

Status in cloud-init:
  In Progress
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Released
Status in cloud-init source package in Zesty:
  Fix Released
Status in cloud-init source package in Artful:
  Fix Released

Bug description:
  http://pad.lv/1724951
  https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1724951

  === Begin SRU Template ===
  [Impact]
  Customers who provide the following cloud-config will get a Runtime error
  #cloud-config
  ntp:

  The expected behavior, per docs, is that an empty ntp configuration will result in
  "4 pools will be used in the format {0-3}.{distro}.pool.ntp.org.".

  [Test Case]

  if [ ! -f './lxc-proposed-snapshot' ]; then
    wget https://raw.githubusercontent.com/cloud-init/ubuntu-sru/master/bin/lxc-proposed-snapshot;
    chmod 755 lxc-proposed-snapshot;
  fi

  # 1. Provide a empty ntp configuration to cloud-init
  cat > install-ntp.conf <<EOF
  #cloud-config
  ntp:
  EOF

  # 2.
  for release in xenial zesty artful; do
          ref=$release-proposed;
          echo "$release START --------------";
          lxc-proposed-snapshot --proposed --publish $release $ref;
          lxc init $ref test-$release;
          lxc config set test-$release user.user-data - < install-ntp.conf;
          lxc start test-$release;
          sleep 10;
          # no runtime error
          lxc exec test-$release -- cat /run/cloud-init/result.json
          # ntp installed
          lxc exec test-$release -- dpkg-query --show ntp;
          # default pools
          lxc exec test-$release -- grep pool /etc/ntp.conf
  done

  [Regression Potential]
  Minimal, this fixes only a corner case where cloud-config ntp specified is completely empty.
  Any more complex ntp configuration are unaffected by code changes.

  [Other Info]
  Upstream commit at
    https://git.launchpad.net/cloud-init/commit/?id=6bc504e41666

  === End SRU Template ===

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