No feedback when kubectl fails to install

[gabegorelick]

If you attempt to install a version of kubectl that doesn't exist, e.g. because you didn't include the point release number, then asdf silently exits with error code 1. Outputting an error message would be nice so that the user is informed that it didn't actually succeed.

$ asdf install kubectl 1.22
Downloading kubectl from https://storage.googleapis.com/kubernetes-release/release/v1.22/bin/darwin/amd64/kubectl
$ echo $?
1

[Quezion]

Was about to open a bug report in the asdf main repo but found this thread. Included report below.

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I'm trying to troubleshoot why Kubectl plugin is "installing" but not appearing on m1. I'm not familiar with ASDF and don't know what the normal "success" prompts look like or where these installs should even go.

I found the error in this case -- there's no actual binary at arm64 here. Assumedly never was, as ARM is probably only on latest branches. https://storage.googleapis.com/kubernetes-release/release/v1.8.16/bin/darwin/arm64/kubectl

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[danieldides]

@Quezion I haven't fixed the error reporting but I did implement a "workaround" in this pr: #20