updated script to install non module versions of kustomize

[nasir-rabbani]

This PR aims to add support of installing the module as well as non module version of kustomize using the install_kustomize.sh script. Related issue : #4130

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[nasir-rabbani]

signed CLA

[natasha41575]

/ok-to-test

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/lifecycle stale

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/lifecycle rotten

[KnVerey]

In trying to figure out how this works (I'm not great at bash!) I discovered it seems to be taken from StackOverflow. Since that uses a CC BY-SA 4.0 license, I don't think we can accept it--Kustomize uses Apache 2.0.

That said, we are dealing with a well-known set of tags here, and both they and our input are guaranteed (by the regex at L73) to have three digits, which makes the task much simpler than the general case. In fact, I'd suggest going with the most naive solution of literally checking the list of exceptions, e.g.:

function getTagName () {
    local requested=$1
    # The complete list of tags published before we started prefixing
    local unprefixedTags=(v1.0.0 v1.0.1 v1.0.10 v1.0.11 v1.0.2 v1.0.3 v1.0.4 v1.0.5 v1.0.6 v1.0.7 v1.0.8 v1.0.9 v2.0.0 v2.0.1 v2.0.2 v2.0.3 v2.1.0 v3.0.0 v3.0.1 v3.0.2 v3.0.3 v3.1.0 v3.2.0 v3.3.0 v3.3.1)

    for tag in ${unprefixedTags[@]}; do
        if [[ $tag = "v$requested" ]]; then
            echo "v$requested"
            return 0
        fi
    done

    echo "kustomize/v$requested"
    return 0
}

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/close

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@k8s-triage-robot: Closed this PR.

In response to this:

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/close

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