#!/bin/bash
#
# LOCAL_SBIN="/usr/local/sbin/install_kompose" && echo "" > "${LOCAL_SBIN}" && vi "${LOCAL_SBIN}" && chmod 0755 "${LOCAL_SBIN}";
#
# ------------------------------------------------------------
if [[ 0 -eq 1 ]]; then # RUN THIS SCRIPT

curl -H 'Cache-Control: no-cache' -s "https://raw.githubusercontent.com/mcavallo-git/cloud-infrastructure/main/usr/local/sbin/install_kompose?t=$(date +'%s.%N')" | bash;

fi;
# ------------------------------
#
# kompose - Install kompose (converts ('bakes') docker-compose YAML files to Kubernetes YAML files, which kubectl can then deploy to K8S (Kubneretes) clusters))
#
# Get the latest version of kompose
echo "------------------------------------------------------------";
echo "Getting the latest version of \"kompose\"...";
KOMPOSE_LATEST_VERSION=$(curl -sL "https://github.com/kubernetes/kompose/releases" | grep 'https://github.com/kubernetes/kompose/releases/download' | grep -i 'linux-amd64' | head -n 1 | sed -re "s/^.+https:\/\/github\.com\/kubernetes\/kompose\/releases\/download\/v([0-9\.]+)\/kompose-linux-amd64\s+.+$/\1/";);
echo "Latest version of \"kompose\":  [ ${KOMPOSE_LATEST_VERSION} ]";
# Determine if latest version of kompose is installed
if [[ -z "$(command -v kompose-${KOMPOSE_LATEST_VERSION} 2>'/dev/null';)" ]]; then  # Distros: Debian, Ubuntu, etc.
  # kompose - Determine the local executable directory to place kompose into (which exists on the PATH)
  BIN_DIR="/usr/local/bin";
  BIN_PATH_TESTWRITE="${BIN_DIR}/test-write-permissions-$(date +'%Y%m%d_%H%M%S')";
  # Note: touch is required as Git Bash (for Windows) doesn't accurately show filepath write-permissions, thereby requiring actually performing a write & reactively performing followup steps if it fails
  touch "${BIN_PATH_TESTWRITE}" 1>'/dev/null' 2>&1;
  if [ ! -f "${BIN_PATH_TESTWRITE}" ]; then
    # If write failed, add path to user-specific directory already on said user's PATH env-var
    BIN_DIR=$(echo ${PATH} | tr ':' "\n" | grep ${HOME} | head -n 1);
    mkdir -p "${BIN_DIR}";
  else
    rm -f "${BIN_PATH_TESTWRITE}";
  fi;
  BIN_DIR_KOMPOSE_CLI="${BIN_DIR}/kompose";
  BIN_DIR_KOMPOSE_VERSIONED_CLI="${BIN_DIR}/kompose-${KOMPOSE_LATEST_VERSION}";
  echo "------------------------------------------------------------";
  echo "Downloading \"kompose-${KOMPOSE_LATEST_VERSION}\" to path \"${BIN_DIR_KOMPOSE_VERSIONED_CLI}\"...";
  if [ "$(uname -s)" == "Linux" ] || [[ "${OSTYPE}" == linux-gnu* ]]; then # Install kompose for Linux
    curl -sL "https://github.com/kubernetes/kompose/releases/download/v${KOMPOSE_LATEST_VERSION}/kompose-linux-amd64" -o "${BIN_DIR_KOMPOSE_VERSIONED_CLI}";
  elif [[ "${OSTYPE}" == "darwin"* ]]; then # Install kompose for MacOS
    curl -sL "https://github.com/kubernetes/kompose/releases/download/v${KOMPOSE_LATEST_VERSION}/kompose-darwin-amd64" -o "${BIN_DIR_KOMPOSE_VERSIONED_CLI}";
  else # Install kompose for Git Bash (Windows)
    curl -sL "https://github.com/kubernetes/kompose/releases/download/v${KOMPOSE_LATEST_VERSION}/kompose-windows-amd64.exe" -o "${BIN_DIR_KOMPOSE_VERSIONED_CLI}";
  fi;
  chmod +x "${BIN_DIR_KOMPOSE_VERSIONED_CLI}";
  # kompose - create a symbolic link from "kompose" command to "kompose-(version)" command
  ln -sf "${BIN_DIR_KOMPOSE_VERSIONED_CLI}" "${BIN_DIR_KOMPOSE_CLI}";
  echo "------------------------------------------------------------";
  echo "";
  echo "To use kompose, either:"
  echo " |";
  echo " |--> Call [ cd \"\${DIRNAME_INPUT_DOCKER_COMPOSE}\"; kompose convert; ]";
  echo " |    - Set \${DIRNAME_INPUT_DOCKER_COMPOSE} to the desired path of the docker-compose input file's parent/working directory";
  echo " |    - kompose will output the Kubernetes Manifest file(s) to the same (input) parent/working directory path, \${DIRNAME_INPUT_DOCKER_COMPOSE}";
  echo " |";
  echo " |--> Call [ kompose convert -f \"\${FULLPATH_INPUT_DOCKER_COMPOSE}\" -o \"\${FULLPATH_OUTPUT_KUBERNETES_MANIFEST}\"; ]";
  echo "      - Set \${FULLPATH_INPUT_DOCKER_COMPOSE} to the desired path of the input docker-compose file (to be converted)";
  echo "      - Set \${FULLPATH_OUTPUT_KUBERNETES_MANIFEST} to the desired path of the Kubernetes Manifest file output by kompose";
  echo "";
else
  echo "------------------------------------------------------------";
  echo "Skipping install (kompose-${KOMPOSE_LATEST_VERSION} already installed)";
fi;

# kompose - Show path to executables
echo "------------------------------------------------------------";
echo "Calling [ command -v kompose; ]...";
command -v kompose;

echo "------------------------------------------------------------";
echo "Calling [ command -v kompose-${KOMPOSE_LATEST_VERSION}; ]...";
command -v kompose-${KOMPOSE_LATEST_VERSION};

echo "------------------------------------------------------------";
echo "Calling [ kompose version; ]...";
kompose version


# ------------------------------------------------------------
#
# Citation(s)
#
#   kubernetes.io  |  "Translate a Docker Compose File to Kubernetes Resources | Kubernetes"  |  https://kubernetes.io/docs/tasks/configure-pod-container/translate-compose-kubernetes/#install-kompose
#
# ------------------------------------------------------------