This commit adds the overlayfs type to the lxc_container module. In
Adding the overlayfs type the commit adds the ability to clone a
container. While cloning is not locked down to only the overlayfs
container backend it is of particular interest when using the overlayfs
backend as it provides for amazingly fast snapshots.
Changes to the resource types and documentation have been added on how
the new backend type can be used along with the clone operation.
This PR addresses a question asked on the original merged pull request
for overlayfs support which came from @fghaas on PR
"https://github.com/ansible/ansible-modules-extras/pull/123".
The overlayfs archive function is a first class function and will
allow for the containers to be backed-up using all methods which
brings support up to that of all other storage backends.
The option parsing object within the module was performing a split
on an '=' sign and assuming that there would only ever be one '='
in a user provided option. Sadly, the assumption is incorrect and
the list comprehension that is building the options list needs to
be set to split on the first occurrence of an '=' sign in a given
option string. This commit adds the required change to make it
possible for options to contain additional '=' signs and be handled
correctly.
