Fix install_kustomize.sh

[bewing]

Github recently changed their API to sometimes remove whitespace from JSON responses. This commit updates the find_release_url bash function to use grep's --only-matching option to return just the browser_download_url keys and values regardless of whitespace.

I was able to test the regex against old and new by passing the JSON document through jq first:

$ curl -s --header "Authorization: Bearer $GITHUB_TOKEN" https://api.github.com/repos/kubernetes-sigs/kustomize/releases | grep -o '"browser_download_url":[[:space:]]*"[^" ]\+linux_amd64
[^" ]\+' | cut -d '"' -f 4 | sort -V
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.4/kustomize_v4.5.4_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.5/kustomize_v4.5.5_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.6/kustomize_v4.5.6_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.7/kustomize_v4.5.7_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.0/kustomize_v5.0.0_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.1/kustomize_v5.0.1_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.2/kustomize_v5.0.2_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.3/kustomize_v5.0.3_linux_amd64.tar.gz

$ curl -s --header "Authorization: Bearer $GITHUB_TOKEN" https://api.github.com/repos/kubernetes-sigs/kustomize/releases | jq . | grep -o '"browser_download_url":[[:space:]]*"[^" ]\+linu
x_amd64[^" ]\+' | cut -d '"' -f 4 | sort -V
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.4/kustomize_v4.5.4_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.5/kustomize_v4.5.5_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.6/kustomize_v4.5.6_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v4.5.7/kustomize_v4.5.7_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.0/kustomize_v5.0.0_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.1/kustomize_v5.0.1_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.2/kustomize_v5.0.2_linux_amd64.tar.gz
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v5.0.3/kustomize_v5.0.3_linux_amd64.tar.gz

closes #4769

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[k8s-ci-robot]

Hi @bewing. Thanks for your PR.

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[oxr463]

Works on my end:

/bin/bash ./hack/install_kustomize.sh
v5.0.3
kustomize installed to /home/oxr463/src/kustomize/kustomize

[Aisuko]

approved

[Aisuko]

I have tested it too. It works for me.

@Aisuko ➜ /workspaces/kustomize (install_fix) $ /bin/bash ./hack/install_kustomize.sh
v5.1.0
kustomize installed to /workspaces/kustomize/kustomize

[Aisuko]

/assign

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/lifecycle stale

[oxr463]

/remove-lifecycle stale

[antoooks]

Thanks for your kontribution @bewing !

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Aisuko, bewing, oxr463
Once this PR has been reviewed and has the lgtm label, please assign varshaprasad96 for approval. For more information see the Kubernetes Code Review Process.

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[bewing]

@ncapps or @KnVerey can I get a review of this PR?

[ncapps]

Hi,

Thank you for your contribution. I am not able to reproduce the issue described in #4769.

The install_kustomize.sh script appears to be installing the correct kustomize version on my machine. I am using the zsh shell.

zsh --version
zsh 5.9 (x86_64-apple-darwin23.0)

grep --version
grep (BSD grep, GNU compatible) 2.6.0-FreeBSD

# Install kustomize version 5.3.0 in tmp directory
$ ./hack/install_kustomize.sh 5.3.0 tmp
v5.3.0
kustomize installed to /Users/nick/go/src/github.com/ncapps/kustomize/tmp/kustomize

# Verify kustomize 5.3.0 is installed
$ tmp/kustomize version
v5.3.0

# Install kustomize version 5.2.1 in tmp directory
$ ./hack/install_kustomize.sh 5.2.1 tmp
v5.2.1
kustomize installed to /Users/nick/go/src/github.com/ncapps/kustomize/tmp/kustomize

# Verify kustomize 5.2.1 is installed
$ tmp/kustomize version             
v5.2.1

[bewing]

I'm still seeing single-line output from the Github API in my location (Chicago, IL)

$ dig AAAA +short github.com
$ dig +short github.com
140.82.114.3

$ curl -s https://api.github.com/repos/kubernetes-sigs/kustomize/releases | wc -l
0


$ hack/install_kustomize.sh
tar (child): ./kustomize_v*_linux_amd64.tar.gz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now