Add Progress bar: Transferring cached image

[wfhartford]

I've recently started making use of the minikube image cache. When starting minikube, the startup stalls for a very long time at the following:

😄  minikube v1.8.2 on Linuxmint 19.3
✨  Using the kvm2 driver based on user configuration
🔥  Creating kvm2 VM (CPUs=8, Memory=18432MB, Disk=40000MB) ...
🐳  Preparing Kubernetes v1.17.3 on Docker 19.03.6 ...
🚀  Launching Kubernetes ... 
🌟  Enabling addons: default-storageclass, storage-provisioner

The first few times I encountered this, I though something had broken. It would be helpful to indicate to the user that progress is being made.

[priyawadhwa]

Hey @wfhartford -- thanks for opening this issue. Could you provide the output of:

minikube start --alsologtostderr

so that we can see exactly where minikube is stalling? Thanks!

[wfhartford]

Attaching the requested output:
minikube-start-logs.txt

In this log you can see that the time between these two lines is about 5 minutes.

🌟  Enabling addons: default-storageclass, storage-provisioner
⌛  Waiting for cluster to come online ...

Without the stderr logs, there is no clear indication as to what is taking so long. Once we realise that this delay is required to pre-load the docker image cache, the duration is completely understandable. I'm using quite a few large images.

To be clear, this issue is not a request to make that copy faster, simply to provide some indication to the user as to what is happening in the 5 minutes (or more or less depending on the contents of the cache) that there is no activity on the console.

[priyawadhwa]

@wfhartford thanks for clarifying!

I feel like the simple fix is just to add additional logging, something like:

   Transferring cached image busybox ...
   Transferring cached image ubuntu ....

and a slightly more advanced fix could be a progress bar.

If anyone is interested in adding either of these, please feel free to take on this issue by commenting /assign.

[wfhartford]

The simple logging solution could probably be easily enhanced by including image numbers like this:

Transferring cached image busybox (1/5) ...
Transferring cached image ubuntu (2/5) ....

[medyagh]

that is a very good suggestion @wfhartford
I would be happy review any PR that adds a progress bar or something like that to the UI !

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