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install_kustomize.sh
executable file
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install_kustomize.sh
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#!/usr/bin/env bash
# If no argument is given -> Downloads the most recently released
# kustomize binary to your current working directory.
# (e.g. 'install_kustomize.sh')
#
# If one argument is given ->
# If that argument is in the format of #.#.#, downloads the specified
# version of the kustomize binary to your current working directory.
# If that argument is something else, downloads the most recently released
# kustomize binary to the specified directory.
# (e.g. 'install_kustomize.sh 3.8.2' or 'install_kustomize.sh $(go env GOPATH)/bin')
#
# If two arguments are given -> Downloads the specified version of the
# kustomize binary to the specified directory.
# (e.g. 'install_kustomize.sh 3.8.2 $(go env GOPATH)/bin')
#
# Fails if the file already exists.
set -e
# Unset CDPATH to restore default cd behavior. An exported CDPATH can
# cause cd to output the current directory to STDOUT.
unset CDPATH
where=$PWD
release_url=https://api.github.com/repos/kubernetes-sigs/kustomize/releases
if [ -n "$1" ]; then
if [[ "$1" =~ ^[0-9]+(\.[0-9]+){2}$ ]]; then
version=v$1
release_url=${release_url}/tags/kustomize%2F$version
elif [ -n "$2" ]; then
echo "The first argument should be the requested version."
exit 1
else
where="$1"
fi
fi
if [ -n "$2" ]; then
where="$2"
fi
if ! test -d "$where"; then
echo "$where does not exist. Create it first."
exit 1
fi
# Emulates `readlink -f` behavior, as this is not available by default on MacOS
# See: https://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac
function readlink_f {
TARGET_FILE=$1
cd "$(dirname "$TARGET_FILE")"
TARGET_FILE=$(basename "$TARGET_FILE")
# Iterate down a (possible) chain of symlinks
while [ -L "$TARGET_FILE" ]
do
TARGET_FILE=$(readlink "$TARGET_FILE")
cd "$(dirname "$TARGET_FILE")"
TARGET_FILE=$(readlink "$TARGET_FILE")
done
# Compute the canonicalized name by finding the physical path
# for the directory we're in and appending the target file.
PHYS_DIR=$(pwd -P)
RESULT=$PHYS_DIR/$TARGET_FILE
echo "$RESULT"
}
where="$(readlink_f $where)/"
if [ -f "${where}kustomize" ]; then
echo "${where}kustomize exists. Remove it first."
exit 1
elif [ -d "${where}kustomize" ]; then
echo "${where}kustomize exists and is a directory. Remove it first."
exit 1
fi
tmpDir=`mktemp -d`
if [[ ! "$tmpDir" || ! -d "$tmpDir" ]]; then
echo "Could not create temp dir."
exit 1
fi
function cleanup {
rm -rf "$tmpDir"
}
trap cleanup EXIT ERR
pushd "$tmpDir" >& /dev/null
opsys=windows
arch=amd64
if [[ "$OSTYPE" == linux* ]]; then
opsys=linux
elif [[ "$OSTYPE" == darwin* ]]; then
opsys=darwin
fi
RELEASE_URL=$(curl -s $release_url |\
grep browser_download.*${opsys}_${arch} |\
cut -d '"' -f 4 |\
sort -V | tail -n 1)
if [ ! -n "$RELEASE_URL" ]; then
echo "Version $version does not exist."
exit 1
fi
curl -sLO $RELEASE_URL
tar xzf ./kustomize_v*_${opsys}_${arch}.tar.gz
cp ./kustomize "$where"
popd >& /dev/null
${where}kustomize version
echo "kustomize installed to ${where}kustomize"