albert / Docker Install Script

#!/bin/bash # # Installs Docker Engine on Debian-based Linux distributions with colored output. # Runs apt operations quietly, showing high-level status messages. # # Usage: # ./docker.sh # bash <(curl -s https://cdn.albert.lol/docker.sh) # # Requires: # - Running on a Debian-based system (Debian, Ubuntu, etc.) # - User executing the script must have sudo privileges. # - Internet connection. # - A terminal that supports ANSI color codes. # Strict mode set -euo pipefail # --- Configuration --- readonly DOCKER_GPG_KEY_PATH="/etc/apt/keyrings/docker.asc" readonly DOCKER_APT_SOURCE_PATH="/etc/apt/sources.list.d/docker.list" # --- Colors --- # Reference: https://misc.flogisoft.com/bash/tip_colors_and_formatting readonly COLOR_RESET='\033[0m' readonly COLOR_RED='\033[0;31m' readonly COLOR_GREEN='\033[0;32m' readonly COLOR_YELLOW='\033[0;33m' readonly COLOR_BLUE='\033[0;34m' readonly COLOR_BOLD='\033[1m' # --- Helper Functions --- # Logs an informational message (Blue). # Arguments: $*: Message to log. log_info() { echo -e "${COLOR_BLUE}[INFO]${COLOR_RESET} $*" } # Logs a success message (Green). # Arguments: $*: Message to log. log_success() { echo -e "${COLOR_GREEN}[SUCCESS]${COLOR_RESET} $*" } # Logs a warning message (Yellow). # Arguments: $*: Message to log. log_warning() { echo -e "${COLOR_YELLOW}[WARNING]${COLOR_RESET} $*" } # Logs an error message (Red) and exits. # Arguments: $*: Message to log. log_error() { # Ensure error message goes to stderr echo -e >&2 "${COLOR_RED}${COLOR_BOLD}[ERROR]${COLOR_RESET}${COLOR_RED} $*${COLOR_RESET}" exit 1 } # Checks if a command exists. # Arguments: $1: Command name. command_exists() { command -v "$1" >/dev/null 2>&1 } # --- Main Functions --- # Step 1: Update package lists and install prerequisite packages. install_prerequisites() { local pkgs=("ca-certificates" "curl" "gnupg") log_info "Updating package list (apt-get update)..." # Run update quietly (-qq) if ! sudo apt-get update -qq; then log_error "Failed to update package lists." fi log_info "Installing prerequisite packages: ${pkgs[*]}..." # Run install quietly (-qq) and assume yes (-y) if ! sudo apt-get install -y -qq "${pkgs[@]}"; then log_error "Failed to install prerequisite packages: ${pkgs[*]}." fi log_success "Prerequisites installed." } # Step 2: Set up Docker's official APT repository. setup_apt_repository() { log_info "Setting up Docker's APT repository..." # Create the directory for the GPG key if it doesn't exist log_info "Ensuring keyring directory exists: /etc/apt/keyrings" sudo install -m 0755 -d "$(dirname "${DOCKER_GPG_KEY_PATH}")" # Download Docker's official GPG key log_info "Downloading Docker GPG key to ${DOCKER_GPG_KEY_PATH}" # Use curl with fail-fast, silent, show-error, location-follow flags # Capture curl stderr to check for errors even with -s local curl_stderr if ! curl_stderr=$(sudo curl -fsSL "https://download.docker.com/linux/debian/gpg" -o "${DOCKER_GPG_KEY_PATH}" 2>&1); then log_error "Failed to download Docker GPG key. Curl output: ${curl_stderr}" fi # Ensure the key is readable by apt sudo chmod a+r "${DOCKER_GPG_KEY_PATH}" log_success "Docker GPG key downloaded and permissions set." # Detect architecture and OS codename local arch arch="$(dpkg --print-architecture)" local codename # Source os-release safely if [[ -f /etc/os-release ]]; then # shellcheck source=/dev/null codename="$(. /etc/os-release && echo "$VERSION_CODENAME")" else log_error "Cannot determine OS codename. /etc/os-release not found." fi if [[ -z "$codename" ]]; then log_error "Could not determine VERSION_CODENAME from /etc/os-release." fi # Add the Docker repository to Apt sources log_info "Adding Docker repository source to ${DOCKER_APT_SOURCE_PATH}" echo \ "deb [arch=${arch} signed-by=${DOCKER_GPG_KEY_PATH}] https://download.docker.com/linux/debian \ ${codename} stable" | sudo tee "${DOCKER_APT_SOURCE_PATH}" > /dev/null log_success "Docker APT repository added." } # Step 3: Install Docker Engine packages. install_docker() { local docker_pkgs=("docker-ce" "docker-ce-cli" "containerd.io" "docker-buildx-plugin" "docker-compose-plugin") log_info "Updating package list after adding Docker repository..." # Run update quietly (-qq) if ! sudo apt-get update -qq; then log_warning "Second 'apt-get update' failed. This might be okay if sources are correct, continuing installation..." # Don't exit here, as sometimes transient network issues cause this but install might still work if cache is okay. fi log_info "Installing Docker packages: ${docker_pkgs[*]}..." # Run install quietly (-qq) and assume yes (-y) if ! sudo apt-get install -y -qq "${docker_pkgs[@]}"; then log_error "Failed to install Docker packages: ${docker_pkgs[*]}." fi log_success "Docker packages installed." } # Step 4: Perform post-installation steps (add user to docker group). post_install() { log_info "Adding current user (${USER}) to the 'docker' group..." if getent group docker > /dev/null; then # Use GID instead of name for group check in usermod, slightly more robust local docker_gid docker_gid=$(getent group docker | cut -d: -f3) if ! groups "$USER" | grep -qw "$docker_gid" && ! groups "$USER" | grep -qw "docker"; then if sudo usermod -aG docker "$USER"; then log_success "User '${USER}' added to the 'docker' group." log_warning "${COLOR_BOLD}IMPORTANT:${COLOR_RESET}${COLOR_YELLOW} You must log out and log back in for this change to take effect!${COLOR_RESET}" log_info "Alternatively, run 'newgrp docker' in your current shell (may require password)." else log_error "Failed to add user '${USER}' to the 'docker' group." fi else log_info "User '${USER}' is already in the 'docker' group." fi else log_warning "The 'docker' group does not seem to exist. Skipping adding user." log_warning "This might indicate an issue during Docker package installation." fi } # --- Main Execution --- main() { log_info "${COLOR_BOLD}Starting Docker installation script...${COLOR_RESET}" # Basic checks if ! command_exists sudo; then log_error "'sudo' command not found. This script requires sudo privileges." fi # Allow running as root, but it's less common for interactive use. # if [[ $EUID -eq 0 ]]; then # log_warning "Running as root. It's generally recommended to run as a user with sudo privileges." # fi if ! command_exists dpkg || ! command_exists apt-get; then log_error "'dpkg' or 'apt-get' not found. This script requires a Debian-based system." fi if ! [[ -f /etc/os-release ]]; then log_error "File /etc/os-release not found. Cannot determine OS version. Aborting." fi # Execute steps install_prerequisites setup_apt_repository install_docker post_install echo # Add a newline for spacing log_success "-----------------------------------------------------" log_success "${COLOR_BOLD}Docker installation completed successfully! 🎉${COLOR_RESET}" log_warning "${COLOR_BOLD}REMEMBER TO LOG OUT AND LOG BACK IN${COLOR_RESET}${COLOR_YELLOW} to use Docker without 'sudo'.${COLOR_RESET}" log_info "After logging back in, verify installation by running: ${COLOR_BOLD}docker run hello-world${COLOR_RESET}" log_success "-----------------------------------------------------" } # Run the main function main