Bug 2042370

+++ This bug was initially created as a clone of Bug #2040143 +++

Version:
$ openshift-install version
openshift-install 4.10.0-0.nightly-2022-01-13-000150
built from commit 28cfc831cee01eb503a2340b4d5365fd281bf867
release image registry.ci.openshift.org/ocp/release@sha256:089541f3c2bb64b9561fefeed3dae688e422ad1f50a17400525c6cd0bab61f46
release architecture amd64
$ 

Platform: alibabacloud

Please specify:
* IPI

What happened?
Alibabacloud doesn't support VPC in the region "cn-nanjing (China (Nanjing))", so no way to launch a cluster in the region.  

What did you expect to happen?
Suggest to either remove the region from the list, or provide a better error message. The current error message complains about instanceType, which is not the root cause in fact. 

How to reproduce it (as minimally and precisely as possible)?
Always.

Anything else we need to know?
>(1) The current error message.
$ openshift-install create install-config --dir work3
? SSH Public Key /home/fedora/.ssh/ali.pub
? Platform alibabacloud
? Region cn-nanjing
? Base Domain alicloud-qe.devcluster.openshift.com
? Cluster Name jiwei-403
? Pull Secret [? for help] *************
FATAL failed to fetch Install Config: failed to generate asset "Install Config": [controlPlane.platform.alibabacloud.instanceType: Invalid value: "ecs.g6.xlarge": no available availability zones found, compute[0].platform.alibabacloud.instanceType: Invalid value: "ecs.g6.large": no available availability zones found]
$ 
>(2) You can see there's no VPC endpoint for the region "cn-nanjing".
$ aliyun vpc DescribeRegions | jq -c ".Regions.Region[] | select(.RegionId | contains(\"cn-nanjing\"))" | jq -r .RegionEndpoint
$ 
$ aliyun vpc DescribeRegions | jq -c ".Regions.Region[] | select(.RegionId | contains(\"cn-hangzhou\"))" | jq -r .RegionEndpoint
vpc.aliyuncs.com
$ 
$ aliyun vpc DescribeRegions | jq -c ".Regions.Region[] | select(.RegionId | contains(\"cn-zhangjiakou\"))" | jq -r .RegionEndpoint
vpc.cn-zhangjiakou.aliyuncs.com
$ 
>(3) Trying an installation in region "cn-nanjing" by customizing the install-config.yaml, finally runtime error shows up.
$ openshift-install create install-config --dir work
? SSH Public Key /home/fedora/.ssh/ali.pub
? Platform alibabacloud
? Region cn-hangzhou
? Base Domain alicloud-qe.devcluster.openshift.com
? Cluster Name jiwei-403
? Pull Secret [? for help] ******
INFO Install-Config created in: work
>$ (edit the install-config.yaml to change into region 'cn-nanjing' and set valid instanceType)
$ yq e '.platform' work/install-config.yaml 
alibabacloud:
  region: cn-nanjing
  defaultMachinePlatform:
    instanceType: ecs.g6e.xlarge
$ 
$ openshift-install create manifests --dir work
INFO Consuming Install Config from target directory 
INFO Manifests created in: work/manifests and work/openshift 
$ grep zoneId work -r
work/openshift/99_openshift-cluster-api_worker-machineset-0.yaml:          zoneId: cn-nanjing-a
work/openshift/99_openshift-cluster-api_master-machines-2.yaml:      zoneId: cn-nanjing-a
work/openshift/99_openshift-cluster-api_master-machines-0.yaml:      zoneId: cn-nanjing-a
work/openshift/99_openshift-cluster-api_master-machines-1.yaml:      zoneId: cn-nanjing-a
$ 
$ openshift-install create cluster --dir work --log-level info
INFO Consuming OpenShift Install (Manifests) from target directory 
INFO Consuming Openshift Manifests from target directory 
INFO Consuming Master Machines from target directory 
INFO Consuming Worker Machines from target directory 
INFO Consuming Common Manifests from target directory 
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
github.com/openshift/installer/pkg/asset/cluster.(*TerraformVariables).Generate(0x25849760, 0x5)
        /go/src/github.com/openshift/installer/pkg/asset/cluster/tfvars.go:744 +0x289a
github.com/openshift/installer/pkg/asset/store.(*storeImpl).fetch(0xc000fdedb0, {0x162dbdf8, 0x25849760}, {0x0, 0x0})
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:227 +0x604
github.com/openshift/installer/pkg/asset/store.(*storeImpl).Fetch(0x16451e58, {0x162dbdf8, 0x25849760}, {0x257fed00, 0x8, 0x8})
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:77 +0x48
main.runTargetCmd.func1({0x7fff94fa715e, 0x4})
        /go/src/github.com/openshift/installer/cmd/openshift-install/create.go:238 +0x116
main.runTargetCmd.func2(0x2580a460, {0xc000ffe480, 0x4, 0x4})
        /go/src/github.com/openshift/installer/cmd/openshift-install/create.go:265 +0xae
github.com/spf13/cobra.(*Command).execute(0x2580a460, {0xc000ffe440, 0x4, 0x4})
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:860 +0x5f8
github.com/spf13/cobra.(*Command).ExecuteC(0xc000fbaa00)
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:974 +0x3bc
github.com/spf13/cobra.(*Command).Execute(...)
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:902
main.installerMain()
        /go/src/github.com/openshift/installer/cmd/openshift-install/main.go:72 +0x29e
main.main()
        /go/src/github.com/openshift/installer/cmd/openshift-install/main.go:50 +0x125
$