Give user a course of action in the case where the suggestions do not
work. This will hopefully allow us to work through any further issues
much faster.
Check commit enables using tls when using the docker_image module. It
also removes the default for docker_url which doesn't allow us to check
for DOCKER_HOST which is a more sane default. This allows you to use
docker_image on OSX but more documentation is needed.
When pulling an image using Docker 1.8, it seems the output
JSON stream has an empty dict at the very end. This causes
ansible to fail when pulling an image, as it's expecting a
status message in that dict which it uses to determine whether
it had to download the image or not. As a bit of an ugly hack
for that which remains backward compatible, try the last item
in the stream, and if it's an empty dict, take the last-but-one
item instead.
The strip() is needed as the exact value appears to be '{}/r/n';
we could just match that, but it seems like the kind of thing
where maybe it'd happen to just be '{}/n' or '{}' or something
in some cases, so let's just use strip() in case.
A recent change [1] in docker between v1.8.2 and v1.8.3 changed what
is returned in the json when inspecting an image. Five variables which
could have been expected before will now be omited when empty. Only
one of those variables is being addressed in the docker, ExposedPorts.
Unfortunately there was also no API version change on this so this
can't be easily corrected with pinning the API to the older version.
This does a get() which will return None if the variable is not in the
dict formed from the json that was returned. Everything else works the
same way.
[1] 9098628b29
Before this patch:
- Command was matched if 'Command' field of docker-py
representation of Docker container ends with 'command' passed
to Ansible docker module by user.
- That can give false positives and false negatives.
- For example:
a) If 'command' was set up with more than one spaces,
like 'command=sleep 123', it would be never matched again
with a container(s) launched by this task.
Because after launching, command would be normalized and
appear, in docker-py API call, just as 'sleep 123' - with one
space. This is false negative case.
b) If 'entrypoint + command = command', for example
'sleep + 123 = sleep 123', module would give false positive
match.
This patch fixes it, by making matching more explicit - against
'Config'->Cmd' field of 'docker inspect' output, provided by docker-py
API and with proper normalization of user input by splitting it to
tokens with 'shlex.split()'.
