Add install-docker.sh

install-docker.sh

@@ -0,0 +1,152 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+log() {
+  printf '\n[%s] %s\n' "$(date -u +'%Y-%m-%d %H:%M:%S UTC')" "$*"
+}
+
+require_root() {
+  if [[ ${EUID:-$(id -u)} -ne 0 ]]; then
+    echo "Please run this script as root or with sudo." >&2
+    exit 1
+  fi
+}
+
+command_exists() {
+  command -v "$1" >/dev/null 2>&1
+}
+
+get_os_info() {
+  if [[ ! -f /etc/os-release ]]; then
+    echo "Cannot detect OS: /etc/os-release not found." >&2
+    exit 1
+  fi
+
+  # shellcheck disable=SC1091
+  . /etc/os-release
+  OS_ID="${ID:-}"
+  OS_LIKE="${ID_LIKE:-}"
+  OS_VERSION_ID="${VERSION_ID:-}"
+  OS_CODENAME="${UBUNTU_CODENAME:-${VERSION_CODENAME:-}}"
+  OS_NAME="${PRETTY_NAME:-${NAME:-unknown}}"
+}
+
+install_debian_family() {
+  log "Detected Debian/Ubuntu family: ${OS_NAME}"
+
+  apt update
+  apt install -y ca-certificates curl
+  install -m 0755 -d /etc/apt/keyrings
+
+  local repo_base
+  case "$OS_ID" in
+    ubuntu)
+      repo_base="https://download.docker.com/linux/ubuntu"
+      ;;
+    debian)
+      repo_base="https://download.docker.com/linux/debian"
+      ;;
+    *)
+      # Fallback for derivatives
+      repo_base="https://download.docker.com/linux/ubuntu"
+      ;;
+  esac
+
+  curl -fsSL "${repo_base}/gpg" -o /etc/apt/keyrings/docker.asc
+  chmod a+r /etc/apt/keyrings/docker.asc
+
+  if [[ -z "${OS_CODENAME}" ]]; then
+    echo "Could not determine distro codename from /etc/os-release." >&2
+    exit 1
+  fi
+
+  cat >/etc/apt/sources.list.d/docker.sources <<EOF
+Types: deb
+URIs: ${repo_base}
+Suites: ${OS_CODENAME}
+Components: stable
+Architectures: $(dpkg --print-architecture)
+Signed-By: /etc/apt/keyrings/docker.asc
+EOF
+
+  apt update
+  apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+  if command_exists systemctl; then
+    if systemctl is-enabled docker >/dev/null 2>&1 || systemctl enable --now docker; then
+      log "Docker service enabled and started."
+    else
+      log "Docker installed, but systemd could not enable/start it automatically."
+      systemctl start docker || true
+    fi
+  fi
+}
+
+install_rhel_family() {
+  log "Detected RHEL/Alma/Rocky/CentOS family: ${OS_NAME}"
+
+  if ! command_exists dnf; then
+    echo "dnf is required for RHEL-family installation but was not found." >&2
+    exit 1
+  fi
+
+  dnf -y install dnf-plugins-core
+  dnf config-manager --add-repo https://download.docker.com/linux/rhel/docker-ce.repo
+  dnf -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+  if command_exists systemctl; then
+    systemctl enable --now docker
+    log "Docker service enabled and started."
+  fi
+}
+
+verify_install() {
+  log "Verifying installation"
+
+  if command_exists docker; then
+    docker --version
+  else
+    echo "docker command not found after installation." >&2
+    exit 1
+  fi
+
+  if docker compose version; then
+    :
+  else
+    echo "docker compose plugin not available after installation." >&2
+    exit 1
+  fi
+
+  if command_exists systemctl; then
+    systemctl --no-pager --full status docker || true
+  fi
+}
+
+main() {
+  require_root
+  get_os_info
+
+  case "$OS_ID" in
+    ubuntu|debian)
+      install_debian_family
+      ;;
+    almalinux|rhel|rocky|centos|fedora)
+      install_rhel_family
+      ;;
+    *)
+      if [[ "$OS_LIKE" == *debian* ]]; then
+        install_debian_family
+      elif [[ "$OS_LIKE" == *rhel* ]] || [[ "$OS_LIKE" == *fedora* ]]; then
+        install_rhel_family
+      else
+        echo "Unsupported OS: ${OS_NAME} (ID=${OS_ID}, ID_LIKE=${OS_LIKE})" >&2
+        exit 1
+      fi
+      ;;
+  esac
+
+  verify_install
+  log "Done."
+}
+
+main "$@"