autocomplete for kubectl version 1.22.0 does not work with exec -it option

[eugene-marchanka]

What happened:
autocomplete for kubectl version 1.22.0 does not work with exec -it option:

• kubectl exec -it <tab_to_see_pods> - does not show pods
• kubectl exec <tab_to_see_pods> -it -- bash - shows pods

What you expected to happen:
autocomplete for kubectl version 1.21.3 works fine with exec -it option:

• k exec -it <tab_to_see_pods> - shows pods list

How to reproduce it (as minimally and precisely as possible):

1. Install kubectl version 1.22.0 and try:

kubectl exec -it <tab_to_see_pods>

2. Install kubectl version 1.21.3 and try:

kubectl exec -it <tab_to_see_pods>

Anything else we need to know?:

Environment:

• Kubernetes client and server versions (use kubectl version):

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.0", GitCommit:"c2b5237ccd9c0f1d600d3072634ca66cefdf272f", GitTreeState:"clean", BuildDate:"2021-08-04T18:03:20Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.7-eks-d88609", GitCommit:"d886092805d5cc3a47ed5cf0c43de38ce442dfcb", GitTreeState:"clean", BuildDate:"2021-07-31T00:29:12Z", GoVersion:"go1.15.12", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.22) and server (1.20) exceeds the supported minor version skew of +/-1

• Cloud provider or hardware configuration:
  AWS/GCP/Baremetal
• OS (e.g: cat /etc/os-release):

$ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.5 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.5 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

[lauchokyip]

It's expected, check kubernetes/kubernetes#96087

Regression:
Custom completions don't work following concatenated short flags, e.g., kubectl exec -it .
This will be fixed in the next Cobra release: spf13/cobra#1258

For the time being, can you try

kubectl exec -i -t <pod>

based on this comment, spf13/cobra#1258 (comment)

[eddiezane]

Thanks for reporting and sorry you ran into this.

As Lau pointed out this was introduced by our migration to Go based completion. We should be able to get this fixed soon.

Tracking updating Cobra here kubernetes/kubernetes#103448.

/triage accepted
/priority backlog