entrypoint and empty cmd

[noteed]

This is similar to #1405, but instead of specifying entrypoint and not cmd, it is with specifying both of them but with cmd [].

I.e.

ENTRYPOINT ["echo"]

and

ENTRYPOINT ["echo"]
CMD []

should both work identically (the second doesn't work).

[crosbymichael]

@noteed Well in your first example an empty array is not the same thing as a nil array.

[noteed]

@crosbymichael Ok, but still, shouldn't they work the same way ? It is weird you cannot use CMD explicitely to provide no default arguments.

[crosbymichael]

Tagged as an easy fix

[joelreymont]

This should be fixed by #2266.

[shykes]

This is a special case of resetting a property inherited from the base image. That generic case is handled in #3465.

Closing this in favor of the more generic version.