http://pad.lv/1709180
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1709180

# ensure contiguous logs across timezone changes in cloud-init

=== Begin SRU Template ===
[Impact]
Logs don't contain timezone information so cloud-config changes to timezone may
make logs appear to go backwards across time changes. This change ensures UTC is used for all logging.

[Test Case]
# create a timezone changing cloud-config
cat >timestamp.yaml <<EOF
#cloud-config
timezone: Pacific/Honolulu
EOF

## launch an instance and validate logs
for release in xenial zesty; do
  ref=$release-proposed;
  name=test-$release;
  lxc-proposed-snapshot --proposed --publish $release $ref;
  lxc init $ref $name;
  lxc config set $name user.user-data - < timestamp.yaml
  lxc start $name;
  sleep 10;
  lxc exec $name -- cat /var/log/cloud-init.log  # and make sure timestamps are contiguous around timezone change
done


[Regression Potential]
Minimal just log timestamp formatting changes

[Other Info]
Upstream commit at
  https://git.launchpad.net/cloud-init/commit/?id=556a0220

=== End SRU Template ===


output logs


Creating xenial-proposed-1068128618
The configuration file contains legacy configuration keys.
Please update your configuration file!
--proposed -- 
...
Get:1 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 cloud-init all 17.1-18-gd4f70470-0ubuntu1~16.04.1 [342 kB]
2017-10-16 22:39:29,443 - handlers.py[DEBUG]: finish: modules-config/config-ntp: SUCCESS: config-ntp ran successfully
2017-10-16 22:39:29,443 - stages.py[DEBUG]: Running module timezone (<module 'cloudinit.config.cc_timezone' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_timezone.py'>) with frequency once-per-instance
2017-10-16 22:39:29,443 - handlers.py[DEBUG]: start: modules-config/config-timezone: running config-timezone with frequency once-per-instance
2017-10-16 22:39:29,443 - util.py[DEBUG]: Writing to /var/lib/cloud/instances/test-xenial/sem/config_timezone - wb: [644] 24 bytes
2017-10-16 22:39:29,444 - helpers.py[DEBUG]: Running config-timezone using lock (<FileLock using file '/var/lib/cloud/instances/test-xenial/sem/config_timezone'>)
2017-10-16 22:39:29,444 - util.py[DEBUG]: Writing to /etc/timezone - wb: [644] 17 bytes
2017-10-16 22:39:29,445 - util.py[DEBUG]: Attempting to remove /etc/localtime
2017-10-16 22:39:29,445 - handlers.py[DEBUG]: finish: modules-config/config-timezone: SUCCESS: config-timezone ran successfully
2017-10-16 22:39:29,446 - stages.py[DEBUG]: Running module disable-ec2-metadata (<module 'cloudinit.config.cc_disable_ec2_metadata' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_disable_ec2_metadata.py'>) with frequency always


----- zesty
Creating zesty-proposed-315387554
The configuration file contains legacy configuration keys.
Please update your configuration file!
--proposed -- 
Get:1 http://archive.ubuntu.com/ubuntu zesty-proposed/main amd64 cloud-init all 17.1-18-gd4f70470-0ubuntu1~17.04.1 [340 kB]
Preconfiguring packages ...
2017-10-16 22:40:41,855 - __init__.py[DEBUG]: Searching for local data source in: ['DataSourceNoCloud']
...
2017-10-16 22:40:48,354 - util.py[DEBUG]: Read 0 bytes from /etc/system-image/channel.ini
2017-10-16 22:40:48,354 - cc_apt_configure.py[DEBUG]: handling apt config: {}
2017-10-16 22:40:48,470 - handlers.py[DEBUG]: finish: modules-config/config-ntp: SUCCESS: config-ntp ran successfully
2017-10-16 22:40:48,470 - stages.py[DEBUG]: Running module timezone (<module 'cloudinit.config.cc_timezone' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_timezone.py'>) with frequency once-per-instance
2017-10-16 22:40:48,470 - handlers.py[DEBUG]: start: modules-config/config-timezone: running config-timezone with frequency once-per-instance
2017-10-16 22:40:48,470 - util.py[DEBUG]: Writing to /var/lib/cloud/instances/test-zesty/sem/config_timezone - wb: [644] 24 bytes
2017-10-16 22:40:48,471 - helpers.py[DEBUG]: Running config-timezone using lock (<FileLock using file '/var/lib/cloud/instances/test-zesty/sem/config_timezone'>)
2017-10-16 22:40:48,471 - util.py[DEBUG]: Writing to /etc/timezone - wb: [644] 17 bytes
2017-10-16 22:40:48,472 - util.py[DEBUG]: Attempting to remove /etc/localtime
2017-10-16 22:40:48,473 - handlers.py[DEBUG]: finish: modules-config/config-timezone: SUCCESS: config-timezone ran successfully
2017-10-16 22:40:48,473 - stages.py[DEBUG]: Running module disable-ec2-metadata (<module 'cloudinit.config.cc_disable_ec2_metadata' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_disable_ec2_metadata.py'>) with frequency always