install

#!/usr/bin/env bash

# this the install script for Dirac CLI tool

set -e -o pipefail

INSTALL_LOCATION=${1:-/usr/local/bin}

NAME="dirac"
SOURCE_URL="https://raw.githubusercontent.com/binaryage/dirac/master/dirac"
TARGET="$INSTALL_LOCATION/$NAME"
EXPECTED_CHECKSUM=${DIRAC_INSTALL_EXPECTED_CHECKSUM:-8e580df350401c1a00c0d93aa720103177dfc4050bdc4ded5e817ff5c403c8ed}

TMP_FILE=$(mktemp "/tmp/dirac.XXXXXX")

echo "Downloading Dirac CLI tool..."
curl -s "$SOURCE_URL" >"$TMP_FILE"

# here we perform a paranoid checksum test to make sure we got expected file
if [[ -n "$EXPECTED_CHECKSUM" ]]; then
  CHECKSUM=$(shasum -a 256 "$TMP_FILE" | cut -d " " -f 1)
  if [[ "$CHECKSUM" != "$EXPECTED_CHECKSUM" ]]; then
    echo "SHA checksum of downloaded file does not match expected value"
    echo "  URL: $SOURCE_URL"
    echo "  FILE: $TMP_FILE"
    echo "  '$CHECKSUM' != '$EXPECTED_CHECKSUM'"
    echo
    echo "If this is not a network issue, please file an issue at https://github.com/binaryage/dirac/issues"
    exit 1
  fi
fi

echo "Installing Dirac CLI tool as '$TARGET'..."
mkdir -p "$(dirname "$TARGET")"
cp "$TMP_FILE" "$TARGET"
chmod a+rx "$TARGET"

command -v $NAME