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#!/usr/bin/bash
set -euo pipefail
usage() {
echo "Usage: $0 [{stable|regular|rapid}]" >&2
}
get_channel() {
echo ${PWD##*/} | grep -Eo '\-(stable|regular|rapid)-' | tr -d '\-'
}
get_major_version() {
curl https://cloud.google.com/feeds/gke-stable-channel-release-notes.xml \
| sed 's/xmlns=".*"//g' \
| xmllint --nocdata --xpath '(/feed/entry)[1]/content/text()' - \
| rg -o 'v?(\d\.\d+)\.\d+-gke\.\d+' -r '$1' \
| head -n 1
}
if [[ $# -eq 0 ]];
then
readonly channel=$(get_channel)
echo "Channel is not specified, automatically detected: $channel" >&2
read -p "Is it correct? y/n " yn
case $yn in
[Yy]* ) set -- "$channel" ;;
* ) usage; exit 0;;
esac
else
readonly channel=$1
fi
case $1 in
-h)
usage
exit 0
;;
stable | regular | rapid)
readonly major_version=$(get_major_version $1)
;;
*)
usage
exit 1
;;
esac
readonly pkgname=kubectl
readonly version=$(curl -sSL "https://gcsweb.k8s.io/gcs/kubernetes-release/release/stable-$major_version.txt")
readonly arches=$( \
curl -sSL https://gcsweb.k8s.io/gcs/kubernetes-release/release/$version/bin/linux/ \
| rg -o --pcre2 '(?<=/icons/dir.png"> )(\w+)' \
| sed -r "/386|amd64|arm|arm64/!d; \
s/386/i686/; \
s/amd64/x86_64/; \
s/\<arm\>/armv5 armv6h armv7h/; \
s/arm64/aarch64/" \
| tr '\n' ' ' \
)
cat <<EOF
# Maintainer: German Lashevich <german.lashevich@gmail.com>
pkgname=$pkgname-gke-$channel-bin
pkgver=$version
pkgrel=1
pkgdesc='Kubernetes.io client binary, compatible with the GKE version from the $channel channel'
provides=("$pkgname=$version")
conflicts=($pkgname $pkgname-bin)
arch=($arches)
url="https://github.com/kubernetes/kubectl"
license=('Apache-2.0')
package() {
install -Dm755 "\$srcdir/$pkgname-$version" "\$pkgdir/usr/bin/kubectl"
}
EOF
for arch in $arches; do
case $arch in
i686)
_arch=386
;;
x86_64)
_arch=amd64
;;
arm*)
_arch=arm
;;
aarch64)
_arch=arm64
;;
*)
echo "Unsupported architecture: $arch" >&2
exit 1
;;
esac
base_url="https://storage.googleapis.com/kubernetes-release/release/$version/bin/linux/$_arch"
echo "source_$arch=('$pkgname-$version::$base_url/kubectl')"
echo "sha256sums_$arch=('$(curl -sSL $base_url/kubectl.sha256)')"
done
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