Little helper to run CNCF's k3s in Docker
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k3d/install.sh

212 lines
5.5 KiB

#!/usr/bin/env bash
APP_NAME="k3d"
REPO_URL="https://github.com/k3d-io/k3d"
: ${USE_SUDO:="true"}
: ${K3D_INSTALL_DIR:="/usr/local/bin"}
# initArch discovers the architecture for this system.
initArch() {
ARCH=$(uname -m)
case $ARCH in
armv5*) ARCH="armv5";;
armv6*) ARCH="armv6";;
armv7*) ARCH="arm";;
aarch64) ARCH="arm64";;
x86) ARCH="386";;
x86_64) ARCH="amd64";;
i686) ARCH="386";;
i386) ARCH="386";;
esac
}
# initOS discovers the operating system for this system.
initOS() {
OS=$(uname|tr '[:upper:]' '[:lower:]')
case "$OS" in
# Minimalist GNU for Windows
mingw*)
OS="windows"
USE_SUDO="false"
if [[ ! -d "$K3D_INSTALL_DIR" ]]; then
# mingw bash that ships with Git for Windows doesn't have /usr/local/bin but ~/bin is first entry in the path
mkdir -p ~/bin
K3D_INSTALL_DIR=~/bin
fi
;;
esac
}
# runs the given command as root (detects if we are root already)
runAsRoot() {
local CMD="$*"
if [ $EUID -ne 0 -a $USE_SUDO = "true" ]; then
CMD="sudo $CMD"
fi
$CMD
}
# scurl invokes `curl` with secure defaults
scurl() {
# - `--proto =https` requires that all URLs use HTTPS. Attempts to call http://
# URLs will fail.
# - `--tlsv1.2` ensures that at least TLS v1.2 is used, disabling less secure
# prior TLS versions.
# - `--fail` ensures that the command fails if HTTP response is not 2xx.
# - `--show-error` causes curl to output error messages when it fails (when
# also invoked with -s|--silent).
curl --proto "=https" --tlsv1.2 --fail --show-error "$@"
}
# verifySupported checks that the os/arch combination is supported for
# binary builds.
verifySupported() {
local supported="darwin-386\ndarwin-amd64\ndarwin-arm64\nlinux-386\nlinux-amd64\nlinux-arm\nlinux-arm64\nwindows-386\nwindows-amd64"
if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
echo "No prebuilt binary for ${OS}-${ARCH}."
echo "To build from source, go to $REPO_URL"
exit 1
fi
if ! type "curl" > /dev/null && ! type "wget" > /dev/null; then
echo "Either curl or wget is required"
exit 1
fi
}
# checkK3dInstalledVersion checks which version of k3d is installed and
# if it needs to be changed.
checkK3dInstalledVersion() {
if [[ -f "${K3D_INSTALL_DIR}/${APP_NAME}" ]]; then
local version=$(k3d version | grep 'k3d version' | cut -d " " -f3)
if [[ "$version" == "$TAG" ]]; then
echo "k3d ${version} is already ${DESIRED_VERSION:-latest}"
return 0
else
echo "k3d ${TAG} is available. Changing from version ${version}."
return 1
fi
else
return 1
fi
}
# checkTagProvided checks whether TAG has provided as an environment variable so we can skip checkLatestVersion.
checkTagProvided() {
[[ ! -z "$TAG" ]]
}
# checkLatestVersion grabs the latest version string from the releases
checkLatestVersion() {
local latest_release_url="$REPO_URL/releases/latest"
if type "curl" > /dev/null; then
TAG=$(scurl -Ls -o /dev/null -w %{url_effective} $latest_release_url | grep -oE "[^/]+$" )
elif type "wget" > /dev/null; then
TAG=$(wget $latest_release_url --server-response -O /dev/null 2>&1 | awk '/^\s*Location: /{DEST=$2} END{ print DEST}' | grep -oE "[^/]+$")
fi
}
# downloadFile downloads the latest binary package and also the checksum
# for that binary.
downloadFile() {
K3D_DIST="k3d-$OS-$ARCH"
DOWNLOAD_URL="$REPO_URL/releases/download/$TAG/$K3D_DIST"
if [[ "$OS" == "windows" ]]; then
DOWNLOAD_URL=${DOWNLOAD_URL}.exe
fi
K3D_TMP_ROOT="$(mktemp -dt k3d-binary-XXXXXX)"
K3D_TMP_FILE="$K3D_TMP_ROOT/$K3D_DIST"
if type "curl" > /dev/null; then
scurl -sL "$DOWNLOAD_URL" -o "$K3D_TMP_FILE"
elif type "wget" > /dev/null; then
wget -q -O "$K3D_TMP_FILE" "$DOWNLOAD_URL"
fi
}
# installFile verifies the SHA256 for the file, then unpacks and
# installs it.
installFile() {
echo "Preparing to install $APP_NAME into ${K3D_INSTALL_DIR}"
runAsRoot chmod +x "$K3D_TMP_FILE"
runAsRoot cp "$K3D_TMP_FILE" "$K3D_INSTALL_DIR/$APP_NAME"
echo "$APP_NAME installed into $K3D_INSTALL_DIR/$APP_NAME"
}
# fail_trap is executed if an error occurs.
fail_trap() {
result=$?
if [ "$result" != "0" ]; then
if [[ -n "$INPUT_ARGUMENTS" ]]; then
echo "Failed to install $APP_NAME with the arguments provided: $INPUT_ARGUMENTS"
help
else
echo "Failed to install $APP_NAME"
fi
echo -e "\tFor support, go to $REPO_URL."
fi
cleanup
exit $result
}
# testVersion tests the installed client to make sure it is working.
testVersion() {
if ! command -v $APP_NAME &> /dev/null; then
echo "$APP_NAME not found. Is $K3D_INSTALL_DIR on your "'$PATH?'
exit 1
fi
echo "Run '$APP_NAME --help' to see what you can do with it."
}
# help provides possible cli installation arguments
help () {
echo "Accepted cli arguments are:"
echo -e "\t[--help|-h ] ->> prints this help"
echo -e "\t[--no-sudo] ->> install without sudo"
}
# cleanup temporary files
cleanup() {
if [[ -d "${K3D_TMP_ROOT:-}" ]]; then
rm -rf "$K3D_TMP_ROOT"
fi
}
# Execution
#Stop execution on any error
trap "fail_trap" EXIT
set -e
# Parsing input arguments (if any)
export INPUT_ARGUMENTS="${@}"
set -u
while [[ $# -gt 0 ]]; do
case $1 in
'--no-sudo')
USE_SUDO="false"
;;
'--help'|-h)
help
exit 0
;;
*) exit 1
;;
esac
shift
done
set +u
initArch
initOS
verifySupported
checkTagProvided || checkLatestVersion
if ! checkK3dInstalledVersion; then
downloadFile
installFile
fi
testVersion
cleanup