feat: add host-side auto-updater for zero-touch API container rebuilds
When the in-container self-updater downloads a new version, it writes trigger.json. The new systemd path unit watches for this file and runs dashcaddy-update.sh, which backs up current API files, copies the new ones, rebuilds the container, verifies health, and writes result.json. Automatic rollback on build or health check failure. Also fixes undefined `isWindows` variable in self-updater.js and adds DASHCADDY_HOST_UPDATES_DIR env var to the installer's docker-compose template for correct container-to-host path translation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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208
dashcaddy-api/scripts/dashcaddy-update.sh
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208
dashcaddy-api/scripts/dashcaddy-update.sh
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#!/usr/bin/env bash
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# DashCaddy Host-Side Updater
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# Triggered by systemd path unit when the container writes trigger.json.
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# Reads the trigger, backs up current API, copies new files, rebuilds container.
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# Writes result.json so the new container knows the outcome.
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#
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# This runs on the HOST, outside the container.
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set -euo pipefail
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readonly UPDATES_DIR="/opt/dashcaddy/updates"
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readonly TRIGGER_FILE="${UPDATES_DIR}/trigger.json"
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readonly RESULT_FILE="${UPDATES_DIR}/result.json"
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readonly BACKUPS_DIR="${UPDATES_DIR}/backups"
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readonly CONTAINER_NAME="dashcaddy-api"
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readonly MAX_BACKUPS=3
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readonly HEALTH_TIMEOUT=60
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log() { echo "[dashcaddy-update] $(date '+%Y-%m-%d %H:%M:%S') $*"; }
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write_result() {
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local success="$1" version="$2" duration="$3"
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shift 3
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local error="${1:-}"
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if [[ "$success" == "true" ]]; then
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cat > "$RESULT_FILE" <<EOF
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{
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"success": true,
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"version": "${version}",
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"duration": ${duration},
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"timestamp": "$(date -u +%Y-%m-%dT%H:%M:%SZ)"
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}
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EOF
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else
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cat > "$RESULT_FILE" <<EOF
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{
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"success": false,
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"version": "${version}",
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"duration": ${duration},
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"error": "${error}",
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"timestamp": "$(date -u +%Y-%m-%dT%H:%M:%SZ)"
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}
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EOF
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fi
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}
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cleanup_old_backups() {
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local count
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count=$(find "$BACKUPS_DIR" -maxdepth 1 -mindepth 1 -type d 2>/dev/null | wc -l)
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if (( count > MAX_BACKUPS )); then
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log "Cleaning old backups (${count} > ${MAX_BACKUPS})"
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find "$BACKUPS_DIR" -maxdepth 1 -mindepth 1 -type d -printf '%T+ %p\n' \
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| sort | head -n $(( count - MAX_BACKUPS )) | cut -d' ' -f2- \
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| xargs rm -rf
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fi
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}
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wait_for_health() {
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local port="${1:-3001}"
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local timeout="$HEALTH_TIMEOUT"
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local elapsed=0
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log "Waiting for health check (timeout: ${timeout}s)..."
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while (( elapsed < timeout )); do
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if curl -fsSL --max-time 3 "http://localhost:${port}/health" &>/dev/null; then
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log "Health check passed after ${elapsed}s"
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return 0
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fi
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sleep 2
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elapsed=$(( elapsed + 2 ))
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done
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log "Health check FAILED after ${timeout}s"
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return 1
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}
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main() {
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local start_time
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start_time=$(date +%s)
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# 1. Read trigger
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if [[ ! -f "$TRIGGER_FILE" ]]; then
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log "No trigger file found — nothing to do"
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exit 0
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fi
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# Parse trigger.json (uses python3 which is available on all supported distros)
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local action version from_version staging_dir api_source_dir
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action=$(python3 -c "import json; print(json.load(open('${TRIGGER_FILE}'))['action'])")
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version=$(python3 -c "import json; print(json.load(open('${TRIGGER_FILE}'))['version'])")
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from_version=$(python3 -c "import json; print(json.load(open('${TRIGGER_FILE}'))['fromVersion'])")
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staging_dir=$(python3 -c "import json; print(json.load(open('${TRIGGER_FILE}'))['stagingDir'])")
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api_source_dir=$(python3 -c "import json; print(json.load(open('${TRIGGER_FILE}'))['apiSourceDir'])")
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log "=== ${action^^}: v${from_version} -> v${version} ==="
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log "Staging: ${staging_dir}"
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log "API source: ${api_source_dir}"
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# Consume the trigger immediately so we don't re-process on failure
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mv "$TRIGGER_FILE" "${TRIGGER_FILE}.processing"
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# 2. Validate staging directory
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if [[ ! -d "$staging_dir" ]]; then
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log "ERROR: Staging directory not found: ${staging_dir}"
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write_result "false" "$version" "$(( $(date +%s) - start_time ))" "Staging directory not found"
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rm -f "${TRIGGER_FILE}.processing"
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exit 1
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fi
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# 3. Backup current API files
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local backup_dir="${BACKUPS_DIR}/${from_version}"
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mkdir -p "$backup_dir"
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log "Backing up current API files to ${backup_dir}"
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# Copy all JS files, package.json, Dockerfile, and routes
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for item in "$api_source_dir"/*.js "$api_source_dir"/package.json "$api_source_dir"/package-lock.json "$api_source_dir"/Dockerfile "$api_source_dir"/openapi.yaml; do
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[[ -f "$item" ]] && cp -f "$item" "$backup_dir/" 2>/dev/null || true
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done
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[[ -d "$api_source_dir/routes" ]] && cp -rf "$api_source_dir/routes" "$backup_dir/"
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# Save version marker
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echo "$from_version" > "$backup_dir/VERSION"
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cleanup_old_backups
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# 4. Copy new files from staging to API source
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log "Deploying new API files..."
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for item in "$staging_dir"/*.js "$staging_dir"/package.json "$staging_dir"/package-lock.json "$staging_dir"/Dockerfile "$staging_dir"/openapi.yaml; do
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[[ -f "$item" ]] && cp -f "$item" "$api_source_dir/" 2>/dev/null || true
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done
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[[ -d "$staging_dir/routes" ]] && cp -rf "$staging_dir/routes" "$api_source_dir/routes/"
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# 5. Rebuild container
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log "Rebuilding container..."
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cd "$api_source_dir"
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local build_ok=false
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if docker compose build --quiet 2>&1; then
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build_ok=true
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elif docker-compose build --quiet 2>&1; then
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build_ok=true
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fi
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if [[ "$build_ok" != "true" ]]; then
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log "ERROR: Docker build failed — rolling back"
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# Restore backup
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for item in "$backup_dir"/*.js "$backup_dir"/package.json "$backup_dir"/package-lock.json "$backup_dir"/Dockerfile "$backup_dir"/openapi.yaml; do
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[[ -f "$item" ]] && cp -f "$item" "$api_source_dir/" 2>/dev/null || true
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done
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[[ -d "$backup_dir/routes" ]] && cp -rf "$backup_dir/routes" "$api_source_dir/routes/"
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write_result "false" "$version" "$(( $(date +%s) - start_time ))" "Docker build failed"
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rm -f "${TRIGGER_FILE}.processing"
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exit 1
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fi
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# 6. Restart container
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log "Restarting container..."
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if docker compose up -d 2>&1 || docker-compose up -d 2>&1; then
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log "Container restarted"
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else
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log "ERROR: Container restart failed — rolling back"
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# Restore backup
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for item in "$backup_dir"/*.js "$backup_dir"/package.json "$backup_dir"/package-lock.json "$backup_dir"/Dockerfile "$backup_dir"/openapi.yaml; do
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[[ -f "$item" ]] && cp -f "$item" "$api_source_dir/" 2>/dev/null || true
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done
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[[ -d "$backup_dir/routes" ]] && cp -rf "$backup_dir/routes" "$api_source_dir/routes/"
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docker compose build --quiet 2>&1 || docker-compose build --quiet 2>&1 || true
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docker compose up -d 2>&1 || docker-compose up -d 2>&1 || true
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write_result "false" "$version" "$(( $(date +%s) - start_time ))" "Container restart failed"
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rm -f "${TRIGGER_FILE}.processing"
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exit 1
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fi
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# 7. Health check
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if wait_for_health; then
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local duration=$(( $(date +%s) - start_time ))
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log "=== Update successful: v${version} in ${duration}s ==="
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write_result "true" "$version" "$duration"
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else
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local duration=$(( $(date +%s) - start_time ))
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log "ERROR: Health check failed after update — rolling back"
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# Restore backup
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for item in "$backup_dir"/*.js "$backup_dir"/package.json "$backup_dir"/package-lock.json "$backup_dir"/Dockerfile "$backup_dir"/openapi.yaml; do
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[[ -f "$item" ]] && cp -f "$item" "$api_source_dir/" 2>/dev/null || true
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done
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[[ -d "$backup_dir/routes" ]] && cp -rf "$backup_dir/routes" "$api_source_dir/routes/"
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docker compose build --quiet 2>&1 || docker-compose build --quiet 2>&1 || true
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docker compose up -d 2>&1 || docker-compose up -d 2>&1 || true
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wait_for_health || log "WARNING: Rollback health check also failed"
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write_result "false" "$version" "$duration" "Health check failed after update"
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fi
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# 8. Cleanup
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rm -f "${TRIGGER_FILE}.processing"
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rm -rf "${UPDATES_DIR}/staging" 2>/dev/null || true
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log "=== Update process complete ==="
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}
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main "$@"
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