[v14] Migrated install scripts to Teleport repo (#43457)

* Migrated install scripts to Teleport repo

* Fix linting errors in install scripts

assets/install-scripts/install-connect.sh

@@ -0,0 +1,327 @@
+#!/bin/bash
+# Copyright 2022 Gravitational, Inc
+#
+# 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.
+
+# This script detects the current Linux distribution and installs Teleport Connect
+# through its package manager, if supported, or downloading a tarball otherwise.
+# We'll download Teleport from the official website and checksum it to make sure it was properly
+# downloaded before executing.
+
+# The script is wrapped inside a function to protect against the connection being interrupted
+# in the middle of the stream.
+
+# For more download options, head to https://goteleport.com/download/
+
+set -euo pipefail
+
+# download uses curl or wget to download a teleport connect binary
+download() {
+  URL=$1
+  TMP_PATH=$2
+
+  echo "Downloading $URL"
+  if type curl &>/dev/null; then
+    set -x
+    $SUDO $CURL -o "$TMP_PATH" "$URL"
+  else
+    set -x
+    $SUDO $CURL -O "$TMP_PATH" "$URL"
+  fi
+  set +x
+}
+
+install_via_apt_get() {
+  echo "Installing Teleport Connect v$TELEPORT_VERSION via apt-get"
+  add_apt_key
+  set -x
+  $SUDO apt-get install -y teleport-connect=$TELEPORT_VERSION
+  set +x
+}
+
+add_apt_key() {
+  APT_REPO_ID=$ID
+  APT_REPO_VERSION_CODENAME=$VERSION_CODENAME
+  IS_LEGACY=0
+
+  # check if we must use legacy .asc key
+  case "$ID" in
+  ubuntu | pop | neon | zorin)
+    if ! expr "$VERSION_ID" : "2.*" >/dev/null; then
+      IS_LEGACY=1
+    fi
+    ;;
+  debian | raspbian)
+    if [ "$VERSION_ID" -lt 11 ]; then
+      IS_LEGACY=1
+    fi
+    ;;
+  linuxmint | parrot)
+    if [ "$VERSION_ID" -lt 5 ]; then
+      IS_LEGACY=1
+    fi
+    ;;
+  elementary)
+    if [ "$VERSION_ID" -lt 6 ]; then
+      IS_LEGACY=1
+    fi
+    ;;
+  kali)
+    YEAR="$(echo "$VERSION_ID" | cut -f1 -d.)"
+    if [ "$YEAR" -lt 2021 ]; then
+      IS_LEGACY=1
+    fi
+    ;;
+  esac
+
+  if [[ "$IS_LEGACY" == 0 ]]; then
+    # set APT_REPO_ID if necessary
+    case "$ID" in
+    linuxmint | kali | elementary | pop | raspbian | neon | zorin | parrot)
+      APT_REPO_ID=$ID_LIKE
+      ;;
+    esac
+
+    # set APT_REPO_VERSION_CODENAME if necessary
+    case "$ID" in
+    linuxmint | elementary | pop | neon | zorin)
+      APT_REPO_VERSION_CODENAME=$UBUNTU_CODENAME
+      ;;
+    kali)
+      APT_REPO_VERSION_CODENAME="bullseye"
+      ;;
+    parrot)
+      APT_REPO_VERSION_CODENAME="buster"
+      ;;
+    esac
+  fi
+
+  echo "Downloading Teleport's PGP public key..."
+  TEMP_DIR=$(mktemp -d -t teleport-XXXXXXXXXX)
+  MAJOR=$(echo "$TELEPORT_VERSION" | cut -f1 -d.)
+  TELEPORT_REPO=""
+
+  if [[ "$IS_LEGACY" == 1 ]]; then
+    if ! type gpg >/dev/null; then
+      echo "Installing gnupg"
+      set -x
+      $SUDO apt-get update
+      $SUDO apt-get install -y gnupg
+      set +x
+    fi
+    TMP_KEY="$TEMP_DIR/teleport-pubkey.asc"
+    download "https://deb.releases.teleport.dev/teleport-pubkey.asc" "$TMP_KEY"
+    set -x
+    cat $TMP_KEY | $SUDO apt-key add -
+    set +x
+    TELEPORT_REPO="deb https://apt.releases.teleport.dev/${APT_REPO_ID?} ${APT_REPO_VERSION_CODENAME?} stable/v${MAJOR}"
+  else
+    TMP_KEY="$TEMP_DIR/teleport-pubkey.gpg"
+    download "https://apt.releases.teleport.dev/gpg" "$TMP_KEY"
+    set -x
+    cat $TMP_KEY | $SUDO tee /usr/share/keyrings/teleport-archive-keyring.asc >/dev/null
+    set +x
+    TELEPORT_REPO="deb [signed-by=/usr/share/keyrings/teleport-archive-keyring.asc]  https://apt.releases.teleport.dev/${APT_REPO_ID?} ${APT_REPO_VERSION_CODENAME?} stable/v${MAJOR}"
+  fi
+
+  set -x
+  echo "$TELEPORT_REPO" | $SUDO tee /etc/apt/sources.list.d/teleport.list >/dev/null
+  set +x
+
+  set -x
+  $SUDO apt-get update
+  set +x
+}
+
+install_via_yum() {
+  TEMP_DIR=$(mktemp -d -t teleport-connect-XXXXXXXXXX)
+
+  ARCH_RPM=$ARCH
+  case $ARCH in
+  amd64)
+    ARCH_RPM="x86_64"
+    ;;
+  esac
+
+  TELEPORT_FILENAME="teleport-connect-${TELEPORT_VERSION}.${ARCH_RPM}.rpm"
+  URL="https://cdn.teleport.dev/${TELEPORT_FILENAME}"
+  download "${URL}" "${TEMP_DIR}/${TELEPORT_FILENAME}"
+
+  TMP_CHECKSUM="${TEMP_DIR}/${TELEPORT_FILENAME}.sha256"
+  download "${URL}.sha256" "$TMP_CHECKSUM"
+
+  set -x
+  cd "$TEMP_DIR"
+  $SUDO $SHA_COMMAND -c "$TMP_CHECKSUM"
+  cd -
+
+  if type dnf &>/dev/null; then
+    echo "Installing Teleport Connect v$TELEPORT_VERSION through dnf"
+    $SUDO dnf -y install "${TEMP_DIR}/${TELEPORT_FILENAME}"
+  else
+    echo "Installing Teleport Connect v$TELEPORT_VERSION through yum"
+    $SUDO yum -y localinstall "${TEMP_DIR}/${TELEPORT_FILENAME}"
+  fi
+  set +x
+}
+
+# download .tar.gz file via curl/wget, unzip it and run the install sript
+install_via_curl() {
+  TEMP_DIR=$(mktemp -d -t teleport-connect-XXXXXXXXXX)
+
+  TELEPORT_FILENAME="teleport-connect-v$TELEPORT_VERSION-linux-$ARCH.tar.gz"
+  URL="https://cdn.teleport.dev/${TELEPORT_FILENAME}"
+  download "${URL}" "${TEMP_DIR}/${TELEPORT_FILENAME}"
+
+  TMP_CHECKSUM="${TEMP_DIR}/${TELEPORT_FILENAME}.sha256"
+  download "${URL}.sha256" "$TMP_CHECKSUM"
+
+  set -x
+  cd "$TEMP_DIR"
+  $SUDO $SHA_COMMAND -c "$TMP_CHECKSUM"
+  cd -
+
+  $SUDO tar -xzf "${TEMP_DIR}/${TELEPORT_FILENAME}" -C "$TEMP_DIR"
+  $SUDO "$TEMP_DIR/teleport/install"
+  set +x
+}
+
+# wrap script in a function so a partially downloaded script
+# doesn't execute
+install_teleport() {
+  # exit if not on Linux
+  if [[ $(uname) != "Linux" ]]; then
+    echo "ERROR: This script works only for Linux. Please go to the downloads page to find the proper installation method for your operating system:"
+    echo "https://goteleport.com/download/"
+    exit 1
+  fi
+
+  KERNEL_VERSION=$(uname -r)
+  MIN_VERSION="2.6.23"
+  if [ $MIN_VERSION != "$(echo -e "$MIN_VERSION\n$KERNEL_VERSION" | sort -V | head -n1)" ]; then
+    echo "ERROR: Teleport Connect requires Linux kernel version $MIN_VERSION+"
+    exit 1
+  fi
+
+  # check if can run as admin either by running as root or by
+  # having 'sudo' or 'doas' installed
+  IS_ROOT=""
+  SUDO=""
+  if [ "$(id -u)" = 0 ]; then
+    # running as root, no need for sudo/doas
+    IS_ROOT="YES"
+    SUDO=""
+  elif type sudo &>/dev/null; then
+    SUDO="sudo"
+  elif type doas &>/dev/null; then
+    SUDO="doas"
+  fi
+
+  if [ -z "$SUDO" ] && [ -z "$IS_ROOT" ]; then
+    echo "ERROR: The installer requires a way to run commands as root."
+    echo "Either run this script as root or install sudo/doas."
+    exit 1
+  fi
+
+  # require curl/wget
+  CURL=""
+  if type curl &>/dev/null; then
+    CURL="curl -fL"
+  elif type wget &>/dev/null; then
+    CURL="wget"
+  fi
+  if [ -z "$CURL" ]; then
+    echo "ERROR: This script requires either curl or wget in order to download files. Please install one of them and try again."
+    exit 1
+  fi
+
+  # require shasum/sha256sum
+  SHA_COMMAND=""
+  if type shasum &>/dev/null; then
+    SHA_COMMAND="shasum -a 256"
+  elif type sha256sum &>/dev/null; then
+    SHA_COMMAND="sha256sum"
+  else
+    echo "ERROR: This script requires sha256sum or shasum to validate the download. Please install it and try again."
+    exit 1
+  fi
+
+  # detect distro
+  OS_RELEASE=/etc/os-release
+  ID=""
+  ID_LIKE=""
+  if [[ -f "$OS_RELEASE" ]]; then
+    # Skip checking the os release file
+    # shellcheck source=/dev/null
+    . $OS_RELEASE
+  fi
+
+  # detect architecture
+  ARCH=""
+  case $(uname -m) in
+  x86_64)
+    ARCH="amd64"
+    ;;
+  **)
+    echo "ERROR: Teleport Connect is currently only supported on amd64."
+    echo "Please refer to the installation guide for more information:"
+    echo "https://goteleport.com/docs/installation/"
+    exit 1
+    ;;
+  esac
+
+  # select install method based on distribution
+  # if ID is debian derivate, run apt-get
+  case "$ID" in
+  debian | ubuntu | kali | linuxmint | pop | raspbian | neon | zorin | parrot | elementary)
+    install_via_apt_get
+    ;;
+  # if ID is amazon Linux 2/RHEL/etc, run yum
+  centos | rhel | fedora | rocky | almalinux | xenenterprise | ol | scientific | amzn)
+    install_via_yum
+    ;;
+  *)
+    # before downloading manually, double check if we didn't miss any
+    # debian or rh/fedora derived distros using the ID_LIKE var
+    case "$ID_LIKE" in
+    ubuntu | debian)
+      install_via_apt_get
+      ;;
+    "rhel fedora" | fedora | "centos rhel fedora")
+      install_via_yum
+      ;;
+    *)
+      # if ID and ID_LIKE didn't return a supported distro, download through curl
+      echo "There is no officially supported package to your package manager. Downloading and installing Teleport Connect via curl."
+      install_via_curl
+      ;;
+    esac
+    ;;
+  esac
+
+  GREEN='\033[0;32m'
+  COLOR_OFF='\033[0m'
+
+  echo ""
+  echo -e "${GREEN}Teleport Connect $TELEPORT_VERSION installed successfully!${COLOR_OFF}"
+  echo "run \`teleport-connect\` to start using Teleport Connect."
+}
+
+TELEPORT_VERSION=""
+if [ $# -ge 1 ] && [ -n "$1" ]; then
+  TELEPORT_VERSION=$1
+else
+  echo "ERROR: Please provide the version you want to install (e.g., 10.2.1)."
+  exit 1
+fi
+install_teleport