Add support for the exec driver/transport

[hartmantis]

There's not really any configuring to do. After mapping it to Inspec's local
backend, it just works.

➜  bundle exec kitchen verify
-----> Starting Kitchen (v1.20.0)
-----> Verifying <default-localhost>...
       Loaded tests from {:path=>".private.tmp.pantstest.test.integration.default"} 

Profile: tests from {:path=>"/private/tmp/pantstest/test/integration/default"} (tests from {:path=>".private.tmp.pantstest.test.integration.default"})
Version: (not specified)
Target:  local://

  File /tmp/pantstest.txt
     ✔  should exist

Test Summary: 1 successful, 0 failures, 0 skipped
       Finished verifying <default-localhost> (0m0.49s).
-----> Kitchen is finished. (0m2.85s)

Signed-off-by: Jonathan Hartman [email protected]

[jquick]

Hey @RoboticCheese thanks for this PR! I have some questions about this implementation. If I understand this correctly we are just binding the runner to local backend which will actually test on the server running kitchen and not the targeted node created with kitchen(as your not using a transport to attach to the generated nodes). Can you lay out the use case for this?

[hartmantis]

Your understanding is correct. The exec driver doesn't create any VMs, Docker containers, etc.; it just shells out on the local machine. The instance running Kitchen and the instance under test are one in the same. The only piece missing to get a successful verify is something mapping Kitchen's exec driver to Inspec's local backend.

I'm not sure what other folks use the exec driver for, but I use it for cookbook testing in TravisCI's macOS build environment and Appveyor's Windows build environment.

[lilithmooncohen]

Anything needed on this to move forward?

[lilithmooncohen]

Great work @RoboticCheese You just saved me a bunch of time. Using local exec for kitchen-terraform provider with the inspec validator and working great!

[jquick]

Thanks for this @RoboticCheese . Talked this over with the team and we will be using the 'local' keyword instead of 'exec' to remove confusion. I will create a follow up PR that will prefer and document the 'local' transport.

[chris-rock]

@RoboticCheese nice work!
@jquick Are we tracking your planned improvements somewhere?

We should also document this behaviour in README.

[jquick]

@chris-rock issue is here #204