AMF CLI installer

installer.sh

#!/usr/bin/env bash

# Copyright 2018 MuleSoft All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The install script is based off of the MIT-licensed script from glide,
# the package manager for Go: https://github.com/Masterminds/glide.sh/blob/master/get

PROJECT_NAME="amf"
DESIRED_VERSION="1.2.0"
AMF_DIST="amf-cli-${DESIRED_VERSION}.jar"
DOWNLOAD_URL="https://repository-master.mulesoft.org/nexus/content/repositories/releases/org/mule/amf/amf-cli/${DESIRED_VERSION}/${AMF_DIST}"

: ${AMF_INSTALL_DIR:="/usr/local/bin"}

# runs the given command as root (detects if we are root already)
runAsRoot() {
  local CMD="$*"

  if [ $EUID -ne 0 ]; then
    CMD="sudo $CMD"
  fi

  $CMD
}

# downloadFile downloads the latest binary package and also the checksum
# for that binary.
downloadFile() {
  AMF_TMP_ROOT="$(mktemp -dt amf-installer-XXXXXX)"
  AMF_TMP_FILE="$AMF_TMP_ROOT/$AMF_DIST"
  echo "Downloading $DOWNLOAD_URL"
  if type "curl" > /dev/null 2>&1; then
    curl -SsL "$DOWNLOAD_URL" -o "$AMF_TMP_FILE"
  elif type "wget" > /dev/null; then
    wget -q -O "$AMF_TMP_FILE" "$DOWNLOAD_URL"
  fi
}

convertToBash() {
  AMF_BASH_EXECUTABLE=$AMF_TMP_ROOT/${PROJECT_NAME}
  cat << 'EOF' > ${AMF_BASH_EXECUTABLE}
#!/bin/sh
MYSELF=`which "$0" 2>/dev/null`
[ $? -gt 0 -a -f "$0" ] && MYSELF="./$0"
java=java
if test -n "$JAVA_HOME"; then
    java="$JAVA_HOME/bin/java"
fi
exec "$java" $java_args -jar $MYSELF "$@"
exit 1
EOF
  cat ${AMF_TMP_FILE} >> ${AMF_BASH_EXECUTABLE}
}

installFile() {
  echo "Preparing to install into ${AMF_INSTALL_DIR}"
  runAsRoot cp "${AMF_BASH_EXECUTABLE}" "$AMF_INSTALL_DIR"
  runAsRoot chmod +x "${AMF_INSTALL_DIR}/${PROJECT_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 $PROJECT_NAME with the arguments provided: $INPUT_ARGUMENTS"
      help
    else
      echo "Failed to install $PROJECT_NAME"
    fi
    echo -e "\tFor support, go to https://github.com/mulesoft/amf."
  fi
  cleanup
  exit $result
}

# testVersion tests the installed client to make sure it is working.
testVersion() {
  set +e
  echo "$PROJECT_NAME installed into $AMF_INSTALL_DIR/$PROJECT_NAME"
  AMF="$(which $PROJECT_NAME)"
  if [ "$?" = "1" ]; then
    echo "$PROJECT_NAME not found. Is $AMF_INSTALL_DIR on your "'$PATH?'
    exit 1
  fi
  set -e
  echo "You can run '$PROJECT_NAME' now."
}

# help provides possible cli installation arguments
help () {
  echo "AMF installer:"
  echo "Accepted cli arguments are:"
  echo -e "\t[--help|-h ] ->> prints this help"
}

# cleanup temporary files
cleanup() {
  rm -rf "$AMF_TMP_ROOT"
}

# 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
    '--help'|-h)
       help
       exit 0
       ;;
    *) exit 1
       ;;
  esac
  shift
done
set +u

downloadFile
convertToBash
installFile
testVersion
cleanup