Make Komodo portable

[jondequinor]

Calls to bash, rsync, pip via komodo.shell are hard to debug. STDOUT is swallowed, and it is non-trivial to spit this out again. The assumption here is that all useful info goes over STDERR, which is not always true.

These calls also represents a very turbulent boundary between textual interfaces and Python. You send in strings and get strings back. It in most cases this prevents Komodo from doing any thing intelligent to—or reasoning about why—something failing. Exceptions > error codes.

And it has value that it is easy to run komodo on non-Redhat machines. In the cloud you might use Alpine which ships busybox (subset of normal linux utils). If you run on Debian (and derivatives), the default renamer will crash.

Testing should be easy
At what level should you mock? There's only one available, and that's komodo. And most often komodo is a thin layer on top of a bunch of binaries. Does komodo need testing? Yes.