get.sh

#!/usr/bin/env bash

PROGRAM_NAME="elc"
OWNER="ensi-platform"
REPO="elc"
BIN_LOCATION="/opt/elc"
LINK_LOCATION="/usr/local/bin"

if [ "$VERSION" == "" ]; then
  version=$(curl -sI https://github.com/$OWNER/$REPO/releases/latest | grep -i "location:" | awk -F"/" '{ printf "%s", $NF }' | tr -d '\r')
else
  version="$VERSION"
fi

if [ ! $version ]; then
  echo "Failed while attempting to install $REPO. Please manually install:"
  echo ""
  echo "1. Open your web browser and go to https://github.com/$OWNER/$REPO/releases"
  echo "2. Download the latest release for your platform. Call it '$PROGRAM_NAME-<version>'."
  echo "3. chmod +x ./$PROGRAM_NAME-<version>"
  echo "4. mv ./$PROGRAM_NAME-<version> $BIN_LOCATION"
  echo "5. ln -sf $BIN_LOCATION/$PROGRAM_NAME-<version> $LINK_LOCATION/$PROGRAM_NAME"

  exit 1
fi

if [ -e "$BIN_LOCATION/$PROGRAM_NAME-$version" ]; then
  echo "Already downloaded"
else
  targetFile="/tmp/elc_linux_amd64"
  if [ -e "$targetFile" ]; then
    rm "$targetFile"
  fi

  if ! [ -e "$BIN_LOCATION" ]; then
    mkdir -p "$BIN_LOCATION"
  fi

  echo "Downloading package $url as $targetFile"
  url="https://github.com/$OWNER/$REPO/releases/download/$version/elc_linux_amd64"
  curl -sSL $url --output "$targetFile"
  if [ "$?" = "0" ]; then
    echo "Download complete."
    chmod +x "$targetFile"
    $targetFile --version $> /dev/null
    if [ "$?" != "0" ]; then
      echo "ERROR: Downloaded file is not executable"
      exit 1
    fi
    mv "$targetFile" "$BIN_LOCATION/$PROGRAM_NAME-$version"
    if [ "$?" != "0" ]; then
        echo "ERROR: Unable to move $targetFile into $BIN_LOCATION/$PROGRAM_NAME-$version"
        exit 1
    fi
  else
    echo "ERROR: Unable to download $url into $targetFile"
    exit 1
  fi
fi

if [ -e "$BIN_LOCATION/$PROGRAM_NAME-$version" ]; then
  ln -s -f "$BIN_LOCATION/$PROGRAM_NAME-$version" "$LINK_LOCATION/$PROGRAM_NAME"
fi

echo "Successfully installed"