Kubernetes: Put the non-existent key into the error message

[ttripp]

Kubernetes version (use kubectl version):
Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e099554f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"2017-01-12T04:52:34Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}

Environment:
Linux 4.8.0-37-generic #39-Ubuntu SMP Thu Jan 26 02:27:07 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

What happened:
When a key doesn't exist in a configmap, it produces an error:

references non-existent config key

Adding the missing key would help with debugging.

What you expected to happen:
It should show the key

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

Reference a key in a configmap that doesn't exist.

Anything else we need to know:

[k8s-github-robot]

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[kargakis]

/sig node

[tusharbanne]

H,
Not sure if this is the right place to ask. But not able to understand how to resolve the error.

MountVolume.SetUp failed for volume "kubernetes.io/configmap/b690cfd1-7386-11e7-b005-080027f96241-config" (spec.Name: "config") pod "b690cfd1-7386-11e7-b005-080027f96241" (UID: "b690cfd1-7386-11e7-b005-080027f96241") with: references non-existent config key.