Should I pipe it?

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#!/bin/bash

######################################################################
#
# Site.js installer for Linux (x86 and ARM) and macOS.
#
# Usage:
#
# wget -qO- https://sitejs.org/install | bash
#
# Or:
#
# curl -s https://sitejs.org/install | bash
#
# For alpha, replace bash with bash -s -- alpha
# For beta, replace bash with bash -s -- beta
#
# Copyright (c) 2019-2020 Aral Balkan.
# Released under the AGPL version 3.0 or later license.
# Made with ♥ by Small Technology Foundation (https://small-tech.org)
#
# Like this? Fund us! (https://small-tech.org/fund-us)
#
######################################################################

# Use either wget or curl to download the Site.js binary,
# whichever exists on the system (favour wget).
which wget > /dev/null
if [ $? -eq 0 ]
then
  # wget exists, we’ll use that.
  download="wget -q"
else
  which curl > /dev/null
  if [ $? -eq 0 ]
  then
    # curl exists, we’ll use that.
    download="curl -Os"
  else
    echo
    echo " ❌ The installation script needs either wget or curl installed to continue."
    echo
    exit 1
  fi
fi

set -e

function cleanUp {
  popd > /dev/null
  rm -rf /tmp/sitejs.org
}

releaseChannel=$1

# Release is the default release type (others are alpha and beta).
if [[ "$releaseChannel" == "" ]]; then
  releaseChannel='release'
fi

alphaBinaryVersion=20200823174121
alphaPackageVersion=14.3.0
alphaSourceVersion=90f059c

betaBinaryVersion=20200710135219
betaPackageVersion=14.1.1
betaSourceVersion=afde7bd

releaseBinaryVersion=20220914151124
releasePackageVersion=17.8.0
releaseSourceVersion=5cba1ee

binaryVersionVariableName="${releaseChannel}BinaryVersion"
packageVersionVariableName="${releaseChannel}PackageVersion"
sourceVersionVariableName="${releaseChannel}SourceVersion"

binaryVersion=${!binaryVersionVariableName}
packageVersion=${!packageVersionVariableName}
sourceVersion=${!sourceVersionVariableName}

if [[ "$binaryVersion" == "00000000000000" ]]; then
  echo " ❌ Sorry, no Site.js ${releaseChannel} binaries have been released yet."
  cleanUp
  exit 1
fi

echo
echo " 📡 Downloading Site.js version ${binaryVersion} (${packageVersion}/${sourceVersion})…"

# Mark alpha and beta releases prominently.
if [[ "$releaseChannel" == "alpha" ]]; then

  # Writes ALPHA in large red block letters.
  echo -e '\033[31m'
  echo '     █████  ██      ██████  ██   ██  █████'
  echo '    ██   ██ ██      ██   ██ ██   ██ ██   ██ '
  echo '    ███████ ██      ██████  ███████ ███████ '
  echo '    ██   ██ ██      ██      ██   ██ ██   ██ '
  echo '    ██   ██ ███████ ██      ██   ██ ██   ██'
  echo -e '\033[0m'

elif [[ "$releaseChannel" == "beta" ]]; then

  # Writes BETA in large yellow block letters.
  echo -e '\033[33m'
  echo '    ██████  ███████ ████████  █████ '
  echo '    ██   ██ ██         ██    ██   ██ '
  echo '    ██████  █████      ██    ███████ '
  echo '    ██   ██ ██         ██    ██   ██ '
  echo '    ██████  ███████    ██    ██   ██'
  echo -e '\033[0m'

fi

# Setup.
rm -rf /tmp/sitejs.org
mkdir -p /tmp/sitejs.org
pushd /tmp/sitejs.org > /dev/null

# Download the release.
if [[ "$OSTYPE" == "linux-gnu" || "$OSTYPE" == "linux-gnueabihf" ]]; then
  cpuArchitecture=`uname -m`
  if [[ "$cpuArchitecture" == "x86_64" ]]; then
    # Linux on x64.
    $download "https://sitejs.org/binaries/${releaseChannel}/linux/${binaryVersion}.tar.gz"
  elif [[ "$cpuArchitecture" == "armv7l" || "$cpuArchitecture" == "armv6l" ]]; then
    # Linux on ARM. Tested on Raspberry Pi Zero W (armv6l), 3B+ and 4B (both reporting armv7l).
    $download "https://sitejs.org/binaries/${releaseChannel}/linux-arm/${binaryVersion}.tar.gz"
  elif [[ "$cpuArchitecture" == "aarch64" ]]; then
    # Linux on ARM64. Tested with Pinebook Pro.
    $download "https://sitejs.org/binaries/${releaseChannel}/linux-arm64/${binaryVersion}.tar.gz"
  else
    # Error: unsupported architecture.
    echo
    echo " ❌ Error: this architecture is not supported on Linux (only x86_64, armv6l, and armv7l are)."
    echo
    cleanUp
    exit 1
  fi
elif [[ "$OSTYPE" == "darwin"* ]]; then
  # macOS
  $download "https://sitejs.org/binaries/${releaseChannel}/macos/${binaryVersion}.tar.gz"
else
  # Error: Unsupported operating system.
  echo
  echo " ❌ Error: this operating system is not supported."
  echo
  cleanUp
  exit 1
fi

# Install.
echo " 📦 Installing…"
gzip -d "${binaryVersion}.tar.gz"
tar -xf "${binaryVersion}.tar"

# Ensure /usr/local/bin directory exists (it does not by default on macOS)
sudo mkdir -p /usr/local/bin/

# Install the Site.js binary.
sudo mv site /usr/local/bin/

cleanUp

echo " 🎉 Done!"
echo
We don’t know.

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