Ansible-bender

Ansible-bender now uses Azure Pipelines as a CI system.

Features

* There were updates to documentation in README:
* Info about vfs and overlay buildah storage backends.
* Rootless containers.
* How you can use base images with python2.
* Requirements of ansible-bender.
* Bender now produces a more clear message when a base image doesn't have a
python interpreter.
* You are now able to pass path to the python interpreter inside the base image
via CLI.

Bug fixes

* Bender now uses more buildah commands instead of podman.
* If bender is invoked with a non-root user, the ansible-playbook session is
now wrapped with `buildah unshare`.
* Don't print to error log when an image is being pulled.

I experimented with running ansible-bender inside an OpenShift pod. Details can
be found in a Makefile and in the `contrib/` directory.

Bug fixes

* Ansible-bender is now able to pull base images properly again if they are not
present before a build.
* `podman` is now used to perform `inspect`.
* Working container name was improved to be more safe.

Breaking changes

* Since our executable, `ab`, conflicted with a binary from `httpd` package, I
decided to rename it to `ansible-bender`. Please add a shell alias if you
want ab back.

Features

* You can pass extra arguments to `ansible-playbook` command via
`--ansible-extra-args=`. Use it with caution!
* Python packaging was improved, thanks to great help from webknjaz

Bug fixes

* Ansible-bender now correctly processes build volumes even when a layer is
loaded from cache.

Features

* There is a new command available: `push`. You can push the images you built
to remote locations. This is built on top of `podman push` command, for more
info please see manpages podman-push(1) or skopeo(1).
* Inspecting a build now produces more info: playbook path, ID of the image, build volumes.

Bug fixes

* For file-related actions, when ansible reports changed=False, the respective
layer will be now loaded from cache.

Bug fixes

* Correctly recreate working container when loading a layer from cache.
* When ab is installed using pip on Fedora 29, it wasn't able to import itself
when invoked from the callback plugin. This is now resolved.

Renamed to `ansible-bender`, the binary name was left intact.

Features

* Failed builds are commited as `-failed`.
* The tool tries to find python interpreter inside the base image.
* Added command `list-builds`.
* Added command `get-logs`.
* Added command `inspect`.
* Implemented a caching mechanism:
* Limitation of caching are file tasks: ansible can't detect that a file wasn't changed and reports it changed.
This means that ab is not able to load such result from cache.
* Caching can be controled by a tag `no-cache` which you can put into a task.
* You can disable layering either by build's option `--no-cache` or adding a tag `stop-Layering` to a task.
* Multiple user experience, output, polish changes.