#!/bin/bash # services/changedetection.sh — Web page change detection and notification (Changedetection.io). # Part of the modular post-install system (sourced by setup.sh). # # Can also be run standalone on any machine: # sudo bash changedetection.sh # (Docker must already be installed when run standalone) # ── Standalone bootstrap ────────────────────────────────────────────────────── if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then [[ "$(id -u)" == "0" ]] || { echo "Run with sudo: sudo bash $0"; exit 1; } _SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" _COMMON="$_SELF_DIR/../lib/common.sh" if [[ -f "$_COMMON" ]]; then source "$_COMMON" else log_info() { echo -e "\033[0;34m[INFO]\033[0m $*"; } log_success() { echo -e "\033[0;32m[OK]\033[0m $*"; } log_warning() { echo -e "\033[1;33m[WARN]\033[0m $*"; } log_error() { echo -e "\033[0;31m[ERROR]\033[0m $*" >&2; } require_docker() { command -v docker &>/dev/null || { log_error "Docker not found. Install it first:" log_error " curl -fsSL https://get.docker.com | sudo sh" return 1 } docker compose version &>/dev/null || { log_error "Docker Compose plugin missing:" log_error " sudo apt-get install -y docker-compose-plugin" return 1 } } ensure_docker_dir_ownership() { chown -R "$ACTUAL_USER:$ACTUAL_USER" "$@" 2>/dev/null || true } port_in_use() { local _port="$1" _proto="${2:-tcp}" local _flag="-tlnH" [ "$_proto" = "udp" ] && _flag="-ulnH" ss "$_flag" "sport = :${_port}" 2>/dev/null | grep -q . } find_free_port() { local _varname="$1" _port="$2" _proto="${3:-tcp}" while port_in_use "$_port" "$_proto"; do _port=$((_port + 1)) done eval "$_varname='$_port'" } prompt_text() { local _q="$1" _def="$2" _var="$3" _r [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; } read -r -p " $_q " _r eval "$_var='${_r:-$_def}'" } prompt_yn() { local _q="$1" _def="$2" _var="$3" _r [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; } read -r -p " $_q " _r eval "$_var='${_r:-$_def}'" } configure_caddy_for_service() { local _name="$1" _upstream="$2" _subdomain="$3" _extra="${4:-}" local _caddy_dir="$DOCKER_DIR/caddy" local _caddyfile="$_caddy_dir/Caddyfile" local _display_port="${_upstream##*:}" # Determine mode: local Caddy, remote Caddy, or none local _mode="none" [[ -d "$_caddy_dir" ]] && _mode="local" [[ -n "${CADDY_REMOTE_HOST:-}" ]] && [[ "$_mode" != "local" ]] && _mode="remote" [[ "$_mode" == "none" ]] && { log_info "Access $_name directly on port $_display_port." return 0 } echo "" local _do_caddy="" if [[ "$_mode" == "remote" ]]; then log_info "Remote Caddy configured (${CADDY_REMOTE_HOST})." log_info "A snippet file will be saved to ~/docker/caddy-snippets/." fi read -r -p " Configure Caddy reverse proxy for $_name? [y/N]: " _do_caddy [[ "${_do_caddy,,}" == "y" ]] || { log_info "Skipping — access at: http://localhost:$_display_port" return 0 } # Domain prompt — pre-fill from SITE_DOMAIN when available local _default_domain="" if [[ -n "${SITE_DOMAIN:-}" ]] && [[ "$SITE_DOMAIN" != "example.com" ]]; then _default_domain="${_subdomain}.${SITE_DOMAIN}" log_info "Default: $_default_domain" fi local _domain="" read -r -p " Domain [${_default_domain:-required}]: " _domain _domain="${_domain:-$_default_domain}" [[ -n "$_domain" ]] || { log_warning "No domain entered — skipping Caddy."; return 0; } # Build upstream — remote Caddy uses host IP:port, not container name local _block_upstream="$_upstream" if [[ "$_mode" == "remote" ]]; then _block_upstream="${CADDY_REMOTE_HOST}:${_display_port}" fi local _site_block _site_block="$(cat << CBLOCK # $_name ${_domain} { reverse_proxy ${_block_upstream} header { Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" X-Content-Type-Options "nosniff" X-Frame-Options "SAMEORIGIN" Referrer-Policy "strict-origin-when-cross-origin" } log { output file /var/log/caddy/${_domain}.log format json } ${_extra} } CBLOCK )" if [[ "$_mode" == "local" ]]; then if [[ -f "$_caddyfile" ]]; then local _bk="$_caddy_dir/Caddyfile.backup.$(date +%Y%m%d-%H%M%S)" cp "$_caddyfile" "$_bk" log_info "Backed up Caddyfile to $(basename "$_bk")" else touch "$_caddyfile" fi if grep -q "^${_domain}" "$_caddyfile" 2>/dev/null; then log_warning "$_domain already in Caddyfile" local _ow="" read -r -p " Overwrite? [y/N]: " _ow [[ "${_ow,,}" == "y" ]] || { log_info "Keeping existing entry."; return 0; } sed -i "/^${_domain}/,/^}/d" "$_caddyfile" fi printf '%s\n' "$_site_block" >> "$_caddyfile" log_success "Added $_domain to Caddyfile" docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true if docker exec caddy caddy reload --config /etc/caddy/Caddyfile 2>/dev/null; then log_success "$_name accessible at: https://$_domain" else log_warning "Reload failed — check: docker logs caddy" log_info "Manual reload: docker exec caddy caddy reload --config /etc/caddy/Caddyfile" fi else local _snippet_dir="$DOCKER_DIR/caddy-snippets" local _snippet_file="$_snippet_dir/${_subdomain}.caddy" mkdir -p "$_snippet_dir" printf '%s\n' "$_site_block" > "$_snippet_file" chown "$ACTUAL_USER:$ACTUAL_USER" "$_snippet_file" 2>/dev/null || true log_success "Snippet saved: $_snippet_file" log_info "Copy to Caddy machine:" log_info " scp $_snippet_file caddy-host:~/caddy-snippets/" log_info " rsync -av $_snippet_dir/ caddy-host:~/caddy-snippets/ (all at once)" fi } write_readme() { local _dir="$1"; shift mkdir -p "$_dir" cat > "$_dir/README.md" } backup_if_exists() { local _file="$1" [ -f "$_file" ] || return 0 cp -p "$_file" "${_file}.bak.$(date +%Y%m%d-%H%M%S)" 2>/dev/null } fi ACTUAL_USER="${ACTUAL_USER:-${SUDO_USER:-$USER}}" ACTUAL_HOME="$(getent passwd "$ACTUAL_USER" 2>/dev/null | cut -d: -f6 || echo "${HOME:-/root}")" DOCKER_DIR="${DOCKER_DIR:-$ACTUAL_HOME/docker}" DRY_RUN="${DRY_RUN:-false}" UNATTENDED="${UNATTENDED:-false}" SITE_TZ="${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}" SITE_DOMAIN="${SITE_DOMAIN:-example.com}" SITE_CADDY_NET="${SITE_CADDY_NET:-caddy_net}" CADDY_REMOTE_HOST="${CADDY_REMOTE_HOST:-}" register_service() { :; } _RUN_STANDALONE=1 fi # ───────────────────────────────────────────────────────────────────────────── register_service changedetection utilities "Web page change detection and notification (Changedetection.io)" 5000 install_changedetection() { require_docker || return 1 log_info "Installing Changedetection.io..." local CD_DIR="$DOCKER_DIR/changedetection" local WEB_PORT="5000" if [ "$DRY_RUN" = true ]; then echo "[DRY-RUN] Would create $CD_DIR" echo "[DRY-RUN] Would write docker-compose.yml and .env" echo "[DRY-RUN] Would auto-scan for a free host port" return 0 fi # Scan for a free host port — this default (5000) isn't unique to # Changedetection.io in this repo (frigate also defaults to 5000), so a # plain install shouldn't silently claim a port another already-running # service holds. See CLAUDE.md's "Port collision avoidance" section. find_free_port WEB_PORT "$WEB_PORT" mkdir -p "$CD_DIR/data" ensure_docker_dir_ownership "$CD_DIR" cd "$CD_DIR" || return 1 # Mirrors configure_caddy_for_service's own mode resolution (lib/common.sh): # explicit CADDY_MODE from the site config wins, then a local ~/docker/caddy, # then the legacy CADDY_REMOTE_HOST var. Only "local" joins caddy_net — a # remote Caddy box can't resolve container names on this host's bridge # network anyway; it reaches this service via the host's published port. local _CADDY_MODE="${CADDY_MODE:-none}" [ "$_CADDY_MODE" = "none" ] && [ -d "$DOCKER_DIR/caddy" ] && _CADDY_MODE="local" [ "$_CADDY_MODE" = "none" ] && [ -n "${CADDY_REMOTE_HOST:-}" ] && _CADDY_MODE="remote" local _CADDY_NET_BLOCK="" local _CADDY_NET_SECTION="" if [ "$_CADDY_MODE" = "local" ]; then _CADDY_NET_BLOCK=" networks: - caddy_net " _CADDY_NET_SECTION=" networks: caddy_net: external: true name: ${SITE_CADDY_NET:-caddy_net} " fi backup_if_exists docker-compose.yml cat > docker-compose.yml << CD_COMPOSE name: changedetection services: changedetection: image: ghcr.io/dgtlmoon/changedetection.io:latest container_name: changedetection hostname: changedetection restart: unless-stopped ports: - "${WEB_PORT}:5000" environment: - BASE_URL=\${BASE_URL} - PLAYWRIGHT_DRIVER_URL=ws://playwright-chrome:3000 volumes: - ./data:/datastore ${_CADDY_NET_BLOCK} depends_on: - playwright-chrome playwright-chrome: image: browserless/chrome:latest container_name: playwright-chrome hostname: playwright-chrome restart: unless-stopped environment: - DEFAULT_LAUNCH_ARGS=--no-sandbox --disable-dev-shm-usage ${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION} CD_COMPOSE backup_if_exists .env cat > .env << CD_ENV # Changedetection.io environment — edit before starting if needed BASE_URL=https://changes.${SITE_DOMAIN} CADDY_NET=${SITE_CADDY_NET} CD_ENV chown -R "$ACTUAL_USER:$ACTUAL_USER" "$CD_DIR" chmod 600 "$CD_DIR/.env" echo "" log_success "Changedetection.io configured at $CD_DIR" configure_caddy_for_service "Changedetection" "changedetection:5000" "changes" write_readme "$CD_DIR" << MD # Changedetection.io Monitor web pages for changes and receive notifications via email, Slack, Discord, ntfy, and many other channels. Includes a Playwright/Chrome sidecar for JavaScript-heavy pages. ## Access - URL: http://localhost:${WEB_PORT} - Optional password can be set in Settings → General within the UI. ## Manage \`\`\`bash docker compose up -d # start docker compose down # stop docker compose logs -f # logs docker compose pull && docker compose down && docker compose up -d # update \`\`\` ## Environment Edit \`.env\` to change \`BASE_URL\` (used for notification links), then restart: \`docker compose down && docker compose up -d\` MD local START_CD="" prompt_yn "Start Changedetection.io now? (y/n):" "y" START_CD if [ "$START_CD" = "y" ] || [ "$START_CD" = "Y" ]; then docker compose up -d 2>/dev/null \ && log_success "Changedetection.io started" \ || log_warning "Failed to start — check: docker compose logs" fi echo " Access at: http://localhost:${WEB_PORT}" echo "" } # Run immediately when executed directly (deferred until after function definition) [[ "${_RUN_STANDALONE:-0}" == 1 ]] && install_changedetection