utils.sh

#!/bin/bash

function debug {
  set +x
  echo "~ ${1} ~"
  set -x
}

function info {
  set +x
  echo
  echo "=== ${1} ==="
  echo
  set -x
}

function warning {
  set +x
  echo
  echo "!!! ${1} !!!"
  echo
  set -x
}

function git_clone_or_pull {
  set +x
  DIR=${1}
  REPO=${2}
  BRANCH=${3}
  set -x

  if [ ! -d "${DIR}" ]; then
    git clone -b "${BRANCH}" "${REPO}" "${DIR}"
  fi
  (
    cd "${DIR}" || return 1
    git pull origin "${BRANCH}"
    git submodule update --init --recursive
  )
}

function download_file {
  set +x
  DEST=${1}
  URL=${2}
  set -x

  TMP=$(mktemp)
  curl -4 -sSL -o "${TMP}" "${URL}"

  if [ -f "${DEST}" ]; then
    OLD_MD5=$(md5sum "${DEST}" | cut -d ' ' -f 1)
    NEW_MD5=$(md5sum "${TMP}" | cut -d ' ' -f 1)
    if [ "${OLD_MD5}" != "${NEW_MD5}" ]; then
      TMP2=$(mktemp)
      mv "${DEST}" "${TMP2}"
    fi
  fi

  mv "${TMP}" "${DEST}"
}

function download_executable {
  set +x
  DEST=${1}
  URL=${2}
  set -x

  TMP=$(mktemp)
  curl -4 -sSL -o "${TMP}" "${URL}"
  chmod +x "${TMP}"

  if [ -f "${DEST}" ]; then
    OLD_MD5=$(md5sum "${DEST}" | cut -d ' ' -f 1)
    NEW_MD5=$(md5sum "${TMP}" | cut -d ' ' -f 1)
    if [ "${OLD_MD5}" != "${NEW_MD5}" ]; then
      TMP2=$(mktemp)
      mv "${DEST}" "${TMP2}"
    fi
  fi

  mv "${TMP}" "${DEST}"
}

function create_symlink {
  set +x
  SOURCE_FILE=${1}
  DEST_FILE=${2}

  if [ "$(readlink -f "$DEST_FILE")" != "$SOURCE_FILE" ]; then
    debug "updating symlink ${DEST_FILE} -> ${SOURCE_FILE}"
    ln -f -s "$SOURCE_FILE" "$DEST_FILE"
  fi
  set -x
}