expand_dependencies() was a public interface so we should try and
preserve backwards compat. However, since the interface is really
broken, add a new exported function "get_elements" that instack can
switch to. This returns the canonical list of elements without
duplicates, and gives the path to each element too.
This highlighted that the unit tests were really a bit wrong. They're
testing inner functions when we have an "API" in the get_elements()
function. Convert all unit-tests to use this function instead. Since
this is a library call, convert the sys.exit() calls to raised
exceptions.
Refactor the variable output into a separate function so we can do a
sanity check on it.
The added flake8 ignores are for the "over-indented for ... indent"
which happens a lot with these new longer lines. Most other projects
ignore them.
This is an alternative proposal to
I15609389c18adf3017220fc94552514d195b323a
Change-Id: If97bcd21e45de1b5ed91023fdc441a4617051a6b
5da7574aee