"kubectl exec" in Cygwin gets "Upgrade request required", but not in cmd shell

[Marco Atzeri]

On 13.06.2020 20:53, David Karr via Cygwin wrote:
> I've been using kubectl in Cygwin on Windows 10 for quite a while, to
> communicate to our in-house k8s clusters. I often use "kubectl exec" to
> open a shell in a container or directly execute a shell command.  This has
> worked perfectly fine for a long time.
> 
> A couple of days ago, I discovered that all of these attempts were failing
> with "Upgrade request required".  I hadn't upgraded kubectl or Cygwin in
> quite a while. I doubt our clusters had a k8s upgrade, but it's entirely
> possible.
> 
> A colleague of mine has a very similar desktop configuration (Windows 10,
> Cygwin), and he's not seeing this symptom.
> 
> I noticed that when I ran "kubectl exec" with max verbosity, it shows the
> resulting "curl" command that it runs. I tried that resulting command, and
> it results in the same response. I then tried updating my Cygwin tools and
> retesting, no change.
> 
> I then took the entire resulting "kubectl exec" command line and ran it in
> a "cmd" shell.  No problem at all.  No error.
> 
> I know I haven't provided much useful information yet. I wanted to get an
> initial response before I started providing those diagnostics. Is there a
> clear issue here that I'm not aware of?
> --

from where is kubectl coming from ?

In cygwin I found only a kubectl.py in the ansible package