feat(installer): add installer script (#1280)

* feat(installer): add installer script

* chore(installer): update Rust install message

* chore(installer): update cargo-binstall arguments

* chore(installer): update unsupported message

* chore(installer): update rustup install arguments

* chore(installer): update cargo install arguments

* feat(installer): check if cargo-shuttle is already installed

* feat(installer): prompt for rustup install

* feat(installer): check the package version for pacman install

install.sh

@@ -0,0 +1,180 @@
+#! /usr/bin/env bash
+
+set -euo pipefail
+
+cat <<EOF
+     _           _   _   _      
+ ___| |__  _   _| |_| |_| | ___ 
+/ __| '_ \\| | | | __| __| |/ _ \\
+\__ \\ | | | |_| | |_| |_| |  __/
+|___/_| |_|\\__,_|\\__|\\__|_|\\___|
+                                
+https://www.shuttle.rs
+https://github.com/shuttle-hq/shuttle
+
+Please file an issue if you encounter any problems!
+===================================================
+EOF
+
+if ! command -v curl &>/dev/null; then
+  echo "curl not installed. Please install curl."
+  exit
+elif ! command -v sed &>/dev/null; then
+  echo "sed not installed. Please install sed."
+  exit
+fi
+
+REPO_URL="https://github.com/shuttle-hq/shuttle"
+LATEST_RELEASE=$(curl -L -s -H 'Accept: application/json' "$REPO_URL/releases/latest")
+# shellcheck disable=SC2001
+LATEST_VERSION=$(echo "$LATEST_RELEASE" | sed -e 's/.*"tag_name":"\([^"]*\)".*/\1/')
+
+_install_linux() {
+  echo "Detected Linux!"
+  echo "Checking distro..."
+  if (uname -a | grep -qi "Microsoft"); then
+    OS="ubuntuwsl"
+  elif ! command -v lsb_release &>/dev/null; then
+    echo "lsb_release could not be found. Falling back to /etc/os-release"
+    OS="$(grep -Po '(?<=^ID=).*$' /etc/os-release | tr '[:upper:]' '[:lower:]')" 2>/dev/null
+  else
+    OS=$(lsb_release -i | awk '{ print $3 }' | tr '[:upper:]' '[:lower:]')
+  fi
+  case "$OS" in
+  "arch" | "manjarolinux" | "endeavouros")
+    _install_arch_linux
+    ;;
+  "ubuntu" | "ubuntuwsl" | "debian" | "linuxmint" | "parrot" | "kali" | "elementary" | "pop")
+    # TODO: distribute .deb packages via `cargo-deb` and install them here
+    _install_unsupported
+    ;;
+  *)
+    _install_unsupported
+    ;;
+  esac
+}
+
+_install_arch_linux() {
+  echo "Arch Linux detected!"
+  if command -v pacman &>/dev/null; then
+    pacman_version=$(sudo pacman -Si cargo-shuttle | sed -n 's/^Version *: \(.*\)/\1/p')
+    if [[ "${pacman_version}" != "${LATEST_VERSION#v}"* ]]; then
+      echo "cargo-shuttle is not updated in the repos, ping @orhun!!!"
+      _install_unsupported
+    else
+      echo "Installing with pacman"
+      sudo pacman -S cargo-shuttle
+    fi
+  else
+    echo "Pacman not found"
+    exit 1
+  fi
+}
+
+# TODO: package cargo-shuttle for Homebrew
+_install_mac() {
+  _install_unsupported
+}
+
+_install_binary() {
+  echo "Installing pre-built binary..."
+  case "$OSTYPE" in
+  linux*) target="x86_64-unknown-linux-musl" ;;
+  darwin*) target="x86_64-apple-darwin" ;;
+  *)
+    echo "Cannot determine the target to install"
+    exit 1
+    ;;
+  esac
+  temp_dir=$(mktemp -d)
+  pushd "$temp_dir" >/dev/null || exit 1
+  curl -LO "$REPO_URL/releases/download/$LATEST_VERSION/cargo-shuttle-$LATEST_VERSION-$target.tar.gz"
+  tar -xzf "cargo-shuttle-$LATEST_VERSION-$target.tar.gz"
+  echo "Installing to $HOME/.cargo/bin/cargo-shuttle"
+  mv "cargo-shuttle-$target-$LATEST_VERSION/cargo-shuttle" "$HOME/.cargo/bin/"
+  popd >/dev/null || exit 1
+  if [[ ":$PATH:" != *":$HOME/.cargo/bin:"* ]]; then
+    echo "Add $HOME/.cargo/bin to PATH to run cargo-shuttle"
+  fi
+}
+
+_install_cargo() {
+  echo "Attempting install with cargo"
+  if ! command -v cargo &>/dev/null; then
+    echo "cargo not found! Attempting to install Rust and cargo via rustup"
+    if command -v rustup &>/dev/null; then
+      echo "rustup was found, but cargo wasn't. Something is up with your install"
+      exit 1
+    fi
+    while true; do
+      read -r -p "cargo not found! Do you wish to attempt to install Rust and cargo via rustup? [Y/N] " yn
+      case $yn in
+      [Yy]*)
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s
+        source "$HOME/.cargo/env"
+        ;;
+      [Nn]*) exit ;;
+      *) echo "Please answer yes or no." ;;
+      esac
+    done
+    echo "rustup installed! Attempting cargo install"
+  fi
+
+  cargo install --locked cargo-shuttle
+}
+
+_install_unsupported() {
+  echo "Installing with package manager is not supported"
+
+  if command -v cargo-binstall &>/dev/null; then
+    echo "Installing with cargo-binstall"
+    cargo binstall -y --locked cargo-shuttle
+    return 0
+  fi
+
+  while true; do
+    read -r -p "Do you wish to attempt to install the pre-built binary? [Y/N] " yn
+    case $yn in
+    [Yy]*)
+      _install_binary
+      break
+      ;;
+    [Nn]*)
+      read -r -p "Do you wish to attempt an install with 'cargo'? [Y/N] " yn
+      case $yn in
+      [Yy]*)
+        echo "Installing with 'cargo'..."
+        _install_cargo
+        break
+        ;;
+      [Nn]*) exit ;;
+      *) echo "Please answer yes or no." ;;
+      esac
+      ;;
+    *) echo "Please answer yes or no." ;;
+    esac
+  done
+}
+
+if command -v cargo-shuttle &>/dev/null; then
+  if [[ "$(cargo-shuttle -V)" = *"${LATEST_VERSION#v}" ]]; then
+    echo "cargo-shuttle is already at the latest version!"
+    exit
+  else
+    echo "Updating cargo-shuttle to $LATEST_VERSION"
+  fi
+fi
+
+case "$OSTYPE" in
+linux*) _install_linux ;;
+darwin*) _install_mac ;;
+*) _install_unsupported ;;
+esac
+
+cat <<EOF
+Thanks for installing cargo-shuttle! 🚀
+
+If you have any issues, please open an issue on GitHub or visit our Discord (https://discord.gg/shuttle)!
+EOF
+
+# vim: ts=2 sw=2 et: