diskimage-builder/elements/debian/install.d/10-cloud-opinions
Antoine Musso 23be09ce35 debian: cloud hostname ignored by Jessie
5af25b5f fixed the hostname of Debian images to "debian" since a lack of
hostname definition set the hostname to "(None)".

It has been done by introducing /etc/cloud/cloud.cfg.d/01_hostname.cfg
with content:

  hostname: debian

Review supposed the hostname would be overriden by cloud meta-data. That
might have stand true for Wheezy but it is not the case for Jessie.

cloud-init 0.7.6 ignores cloud metadata whenever "hostname" or "fqdn"
are set in a config file. Roughly:

    # no fqdn set, get fqdn from cloud
    # get hostname from cfg if available otherwise cloud
    fqdn = cloud.get_hostname(fqdn=True)
    if "hostname" in cfg:
        # hashar: set from config file NOT cloud
        hostname = cfg['hostname']
    else:
        # fallback to cloud
        hostname = cloud.get_hostname()

Relevant code is
https://github.com/number5/cloud-init/blob/0.7.6/cloudinit/util.py#L839-L860

Only inject "hostname: debian" for the Wheezy release.

Bug: https://phabricator.wikimedia.org/T117283
Change-Id: I6e2522bd725cbf9651f11c76ecdc72ecbc92f402
2015-10-30 22:34:10 +01:00

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#!/bin/bash
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
DIB_DEBIAN_ALT_INIT_PACKAGE=${DIB_DEBIAN_ALT_INIT_PACKAGE:-sysvinit}
adduser --gecos Debian-cloud-init-user --disabled-password --quiet debian
install -d -m 0755 -o root -g root /etc/sudoers.d
echo 'debian ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/debian-cloud-init
chmod 0440 /etc/sudoers.d/debian-cloud-init
if [ "$DIB_DEBIAN_ALT_INIT_PACKAGE" != "sysvinit" ]; then
# To avoid a conflict against an essential package, we need to remove sysvinit first
dpkg --purge --force remove-essential sysvinit
apt-get install -y $apt_get_bp_extra_opts $DIB_DEBIAN_ALT_INIT_PACKAGE
printf \"Package: sysvinit\nPin: origin ""\nPin-Priority: -1\n\" > \
/etc/apt/preferences.d/sysvinit > /etc/apt/preferences.d/sysvinit
fi
# Since Jessie, when either 'hostname' or 'fqdn' are in a config file, it
# considers them as authoritative and would only use cloud meta data as a
# fallback.
if [ "$DIB_RELEASE" = 'wheezy' ]; then
# specify a hostname so that cloud-init does not default to (None)
echo 'hostname: debian' > /etc/cloud/cloud.cfg.d/01_hostname.cfg
fi