support KUBECONFIG which contains a list of files

[dgrove-oss]

Per the spec (https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) the KUBECONFIG environment variable may contain a list of configuration files (using the platform-specific convention of : or ; to separate list elements).

When using igc 0.2.15, I found the that igc pipeline command fails if KUBECONFIG is set to a path (as opposed to being set to a single file). The output is

daves-mbp:inventory-management-bff-iz-solsa dgrove$ igc pipeline 
Error registering pipeline: Cannot read property 'namespace' of undefined

I also see that if I run the ibm-garage-cloud-cli test suite (clone repo, build, npm run test) that two unit tests fail (log appended) when run in an environment where KUBECONFIG contains a list, but pass if I change my KUBECONFIG to contain just a single element.

 FAIL  src/api/kubectl/role-binding.spec.ts
  ● role-binding › canary verifies test infrastructure

    TypeError: Cannot read property 'namespace' of undefined



      at convertKubeconfig (node_modules/kubernetes-client/backends/request/config.js:60:29)
      at new Request (node_modules/kubernetes-client/backends/request/client.js:112:26)
      at new Client (node_modules/kubernetes-client/lib/swagger-client.js:203:19)
      at new Client1_13 (node_modules/kubernetes-client/lib/swagger-client.js:225:5)
      at KubeClientProvider.get (src/api/kubectl/client.ts:408:12)
      at LocalScope.Object.<anonymous>.LocalScope.resolve (node_modules/typescript-ioc/src/typescript-ioc.ts:523:25)
      at ConfigImpl.Object.<anonymous>.ConfigImpl.getInstance (node_modules/typescript-ioc/src/typescript-ioc.ts:461:30)
      at Function.Object.<anonymous>.IoCContainer.get (node_modules/typescript-ioc/src/typescript-ioc.ts:316:23)
      at Function.Object.<anonymous>.Container.get (node_modules/typescript-ioc/src/typescript-ioc.ts:238:29)
      at Object.get (src/api/kubectl/role-binding.ts:311:42)

  ● role-binding › given updateWithNamespace() › when called › then update the namespace of each subject and in the metadata

    TypeError: Cannot read property 'namespace' of undefined



      at convertKubeconfig (node_modules/kubernetes-client/backends/request/config.js:60:29)
      at new Request (node_modules/kubernetes-client/backends/request/client.js:112:26)
      at new Client (node_modules/kubernetes-client/lib/swagger-client.js:203:19)
      at new Client1_13 (node_modules/kubernetes-client/lib/swagger-client.js:225:5)
      at KubeClientProvider.get (src/api/kubectl/client.ts:408:12)
      at LocalScope.Object.<anonymous>.LocalScope.resolve (node_modules/typescript-ioc/src/typescript-ioc.ts:523:25)
      at ConfigImpl.Object.<anonymous>.ConfigImpl.getInstance (node_modules/typescript-ioc/src/typescript-ioc.ts:461:30)
      at Function.Object.<anonymous>.IoCContainer.get (node_modules/typescript-ioc/src/typescript-ioc.ts:316:23)
      at Function.Object.<anonymous>.Container.get (node_modules/typescript-ioc/src/typescript-ioc.ts:238:29)
      at Object.get (src/api/kubectl/role-binding.ts:311:42)

  ● role-binding › given updateWithNamespace() › when called › then update the namespace of each subject and in the metadata

    TypeError: Cannot read property 'updateWithNamespace' of undefined

      33 |         const toNamespace = 'toNamespace';
      34 | 
    > 35 |         const result = classUnderTest.updateWithNamespace(roleBinding, toNamespace);
         |                                       ^
      36 | 
      37 |         expect(result.metadata.namespace).toEqual(toNamespace);
      38 |         expect(result.subjects[0].namespace).toEqual(toNamespace);

      at Object.<anonymous> (src/api/kubectl/role-binding.spec.ts:35:39)