kurtosis online exec

README.md

kurtosis_exec.sh is a wrapper for fetching, temporarily storing and executing the kurtosis CLI which can be executed with a bash one liner.

It would live in a public location, somewhere like https://kurtosis.com/exec and then be invoked with a single command like:

bash <(curl -s https://kurtosis.com/exec)

where exec is a modified copy of kurtosis_exec.sh by CI to include correct SHASUMs and version numbers. The exec script itself would also need SHASUM files provided, so anyone running this on CI or as part of a deployment script anywhere can ensure that the installer itself has not been tampered with, either.

For the purpose of testing this functionality whilst the script is not hosted anywhere, yet, you can just:

bash <(curl -s file://`pwd`/kurtosis_exec.sh)

to fetch it locally and execute it.

kurtosis_exec.sh

#!/usr/bin/env bash

set -euo pipefail

# TODO: This will need to be generated for each release
KURTOSIS_CLI_VERSION="0.85.55"
KURTOSIS_CLI_SHA256="37bc2ffaddab49c72317dc44d21b4d6ad9a7c6caba946a05ac6a7ea7c9ae5f79"

debug() {
  >&2 echo "$*"
}

error() {
  debug "$@"
  exit 1
}

print_platform() {
  local OS
  OS=$(uname -s)
  local ARCH
  ARCH=$(uname -m)

  if [[ "${OS}" = "Linux" ]] ; then
    echo "linux_${ARCH}"
    return

  elif [[ "${OS}" == "Darwin" ]]; then
    echo "darwin_${ARCH}"
    return
  fi

  error "Unsupported platform; OS: ${OS}, ARCH: ${ARCH}"
}

print_tmpdir() {
    local t
    for t in "${TMPDIR:-}" "${TMP:-}" /var/tmp /tmp
    do
        test -d "${t}" && break
    done
    echo "${t}"
}

PLATFORM=$(print_platform)
KURTOSIS_CLI_URL="https://github.com/kurtosis-tech/kurtosis-cli-release-artifacts/releases/download/${KURTOSIS_CLI_VERSION}/kurtosis-cli_${KURTOSIS_CLI_VERSION}_${PLATFORM}.tar.gz"
STABLE_TMP_DIR=$(print_tmpdir)


main() {
    # TODO: We could have target_folder to be just /usr/local/bin or allow the user of the script to specify it and tell them how to amend their PATH
    # for the purpose of this script we just use a stable temp dir, so we download once and keep the binary there, assuming the release version is stable 
    local target_folder
    target_folder="${STABLE_TMP_DIR}kurtosis/${PLATFORM}/${KURTOSIS_CLI_VERSION}"
    mkdir -p "$target_folder"
    local cli_binary_name="kurtosis"
    local target_cli
    target_cli="${target_folder}/${cli_binary_name}"
    if ! [[ -f "${target_cli}" ]]; then
        pushd "${target_folder}" >/dev/null
        debug "Downloading Kurtosis CLI from ${KURTOSIS_CLI_URL} to ${target_folder}"
        # TODO: we only pull the kurtosis binary for now, but we may want shell completions as well
        curl -s -L "$KURTOSIS_CLI_URL" | tar xz - -C "." "${cli_binary_name}"
        echo "${KURTOSIS_CLI_SHA256} ${cli_binary_name}" | sha256sum --check --status
        popd >/dev/null
    fi

    "${target_cli}" "$@"
}

main "$@"