RFE: Support for Nested OCP clusters in disconnected environments.

[ElCoyote27]

Context: I am trying to use https://github.com/karmab/kcli/blob/main/extras/kubevirt-pod.yml to create an OCP cluster (Nested) on a disconnected baremetal OCP clusters.

I've mirrored to the following images to the local quay:

images="karmab/curl:multi \
karmab/kcli:latest \
karmab/origin-coredns:multi \
karmab/haproxy:multi \
karmab/origin-keepalived-ipfailover:multi \
karmab/mdns-publisher:multi \
karmab/kubectl:multi"

I've made the following changes to the above yaml:

$ diff -b kubevirt-pod.yml.orig kubevirt-pod.yml
32c32
<     image: quay.io/karmab/kcli:latest
---
>     image: central-quay-mvp1.vimv2.ecocenter.fr/ocp4/karmab/kcli
62c62
<       kcli -n $NAMESPACE create cluster openshift -P pull_secret=/etc/pull-secret/pull-secret -P sno_vm=true -P numcpus=$NUMCPUS -P memory=$MEMORY -P service_network_ipv4=$SERVICE_NETWORK_IPV4 -P cluster_network_ipv4=$CLUSTER_NETWORK_IPV4 $CLUSTER
---
>       kcli -n $NAMESPACE create cluster openshift -P pull_secret=/etc/pull-secret/.dockerconfigjson -P sno_vm=true -P numcpus=$NUMCPUS -P memory=$MEMORY -P tag=4.16.4 -P disconnected_url=central-quay-mvp1.vimv2.ecocenter.fr/ocp4 -P disconnected_user=OBFUSCATED -P disconnected_password=OBFUSCATED -P service_network_ipv4=$SERVICE_NETWORK_IPV4 -P cluster_network_ipv4=$CLUSTER_NETWORK_IPV4 $CLUSTER

The result was this:

$ oc apply -f kubevirt-pod.yml
serviceaccount/kcli unchanged
rolebinding.rbac.authorization.k8s.io/kcli-rolebinding unchanged
pod/kubevirt-kcli created


$ oc logs kubevirt-kcli
Deploying on client local
Deploying cluster testk8
sno_disk will be discovered
Using stable version
Downloading oc in current directory

gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
chmod: cannot access 'oc': No such file or directory
Downloading openshift-install from https://mirror.openshift.com/pub/openshift-v4/clients/ocp/4.16.4
Couldn't open url https://mirror.openshift.com/pub/openshift-v4/clients/ocp/4.16.4
Couldn't download openshift-install
error: error reading /root/.kcli/clusters/testk8/auth/kubeconfig.ext: no such file or directory

The pull secret was also a challenge, I ended up copying the one from openshift-config to the 'default' namespace and I had to change /etc/pull-secret/pull-secret to /etc/pull-secret/.dockerconfigjson as a result (I wasn't sure how to create /etc/pull-secret/pull-secret to way it was expected)