Make downloading of kustomize more robust to GitHub API rate limits

[gozer]

Also, introduce kustomize_install as a boolean option that can disable
installing kustomize alltogether, assuming you install it some other way,
like with https://github.com/yokawasa/action-setup-kube-tools

Details of Change

Issue

Fixes #35

Test Results

[nfoucha]

@karancode Any chance of a review and merge of this? Had a pretty rough stretch today trying to get our actions workflows to succeed.

[karancode]

@nfoucha sorry for late.. will get it merged today. Thanks @gozer for the PR.

[karancode]

@gozer looks like this way will fail for older versions (for ex: 3.0.0). Could you please confirm that once ? Thanks!

[gozer]

100% right, I completely misread the loop and thought it was a retry loop, fixed!

❯ INPUT_KUSTOMIZE_VERSION=3.0.0 sh -x entrypoint.sh
+ main ''
++ dirname entrypoint.sh
+ scriptDir=.
+ source ./kustomize_build.sh
+ parse_inputs
+ '[' 3.0.0 '!=' '' ']'
+ kustomize_version=3.0.0
+ kustomize_build_dir=.
+ '[' '' '!=' '' ']'
+ '[' '' '!=' . ']'
+ kustomize_build_dir=
+ kustomize_comment=0
+ '[' '' == 1 ']'
+ '[' '' == true ']'
+ kustomize_install=1
+ '[' '' == 0 ']'
+ '[' '' == false ']'
+ kustomize_output_file=
+ '[' -n '' ']'
+ kustomize_build_options=
+ '[' -n '' ']'
+ enable_alpha_plugins=
+ '[' '' == 1 ']'
+ '[' '' == true ']'
+ '[' 1 == 1 ']'
+ install_kustomize
+ echo 'getting download url for kustomize 3.0.0'
getting download url for kustomize 3.0.0
+ for i in {1..100}
++ curl --retry-all-errors --fail --retry 30 --retry-max-time 120 -s 'https://api.github.com/repos/kubernetes-sigs/kustomize/releases?per_page=100&page=1'
++ jq -r '.[].assets[] | select(.browser_download_url | test("kustomize(_|.)?(v)?3.0.0_linux_amd64"))  | .browser_download_url'
+ url=
+ '[' '!' -z ']'
+ for i in {1..100}
++ curl --retry-all-errors --fail --retry 30 --retry-max-time 120 -s 'https://api.github.com/repos/kubernetes-sigs/kustomize/releases?per_page=100&page=2'
++ jq -r '.[].assets[] | select(.browser_download_url | test("kustomize(_|.)?(v)?3.0.0_linux_amd64"))  | .browser_download_url'
+ url=https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64
+ '[' '!' -z https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64 ']'
+ break
+ '[' '!' -z https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64 ']'
+ echo 'Download URL found in https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64'
Download URL found in https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64
+ echo 'Downloading kustomize v3.0.0'
Downloading kustomize v3.0.0
+ [[ https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64 =~ .tar.gz$ ]]
+ curl --retry 30 --retry-max-time 120 -s -S -L https://github.com/kubernetes-sigs/kustomize/releases/download/v3.0.0/kustomize_3.0.0_linux_amd64 -o /usr/bin/kustomize
curl: (23) Failure writing output to destination
+ '[' 23 -ne 0 ']'
+ echo 'Failed to download kustomize v3.0.0.'
Failed to download kustomize v3.0.0.
+ exit 1

[karancode]

@gozer thanks a lot for the contribution. Changes added in the new release v1.3.0 ❤️