Claude
92f8503d48
Docker-based sync backend for the Anki app (afrima/anki-sync-server, the official Rust sync server). Supports multiple independent accounts per instance, the repo's multi-instance pattern, port collision avoidance, Caddy wiring, and update/fresh/cancel reinstall detection. No Authelia gate — this is a raw sync API the Anki client talks to, not a browser session, so a forward_auth portal in front of it would just break every sync request; SYNC_USER1/SYNC_USER2/... is its own auth boundary. Companion services/anki-sync-server.md covers client setup (Desktop, AnkiDroid, AnkiMobile) and the Quizlet import/export walkthrough. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014DyceEVVeQ33EeS6C1PDv5
487 lines
21 KiB
Bash
487 lines
21 KiB
Bash
#!/bin/bash
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# services/anki-sync-server.sh — Self-hosted Anki flashcard sync server.
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# Part of the modular post-install system (sourced by setup.sh).
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#
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# Can also be run standalone on any machine:
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# sudo bash anki-sync-server.sh
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# (Docker must already be installed when run standalone)
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# ── Standalone bootstrap ──────────────────────────────────────────────────────
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# Detected when the script is executed directly rather than sourced by setup.sh.
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# Sets up helpers and globals, then defers execution until after the function
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# definition at the bottom of this file.
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if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
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[[ "$(id -u)" == "0" ]] || { echo "Run with sudo: sudo bash $0"; exit 1; }
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_SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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_COMMON="$_SELF_DIR/../lib/common.sh"
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if [[ -f "$_COMMON" ]]; then
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# Full repo present — use the real helpers (picks up ~/docker/.config too)
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# shellcheck source=../lib/common.sh
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source "$_COMMON"
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else
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# One-off copy — inline minimal stubs so the script works without the repo
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log_info() { echo -e "\033[0;34m[INFO]\033[0m $*"; }
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log_success() { echo -e "\033[0;32m[OK]\033[0m $*"; }
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log_warning() { echo -e "\033[1;33m[WARN]\033[0m $*"; }
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log_error() { echo -e "\033[0;31m[ERROR]\033[0m $*" >&2; }
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require_docker() {
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command -v docker &>/dev/null || {
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log_error "Docker not found. Install it first:"
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log_error " curl -fsSL https://get.docker.com | sudo sh"
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return 1
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}
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docker compose version &>/dev/null || {
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log_error "Docker Compose plugin missing:"
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log_error " sudo apt-get install -y docker-compose-plugin"
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return 1
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}
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}
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ensure_docker_dir_ownership() {
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chown -R "$ACTUAL_USER:$ACTUAL_USER" "$@" 2>/dev/null || true
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}
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port_in_use() {
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local _port="$1" _proto="${2:-tcp}"
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local _flag="-tlnH"
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[ "$_proto" = "udp" ] && _flag="-ulnH"
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ss "$_flag" "sport = :${_port}" 2>/dev/null | grep -q .
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}
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find_free_port() {
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local _varname="$1" _port="$2" _proto="${3:-tcp}"
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while port_in_use "$_port" "$_proto"; do
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_port=$((_port + 1))
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done
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eval "$_varname='$_port'"
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}
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# Match common.sh's eval-based pattern so local vars in install_* are set correctly
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prompt_text() {
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local _q="$1" _def="$2" _var="$3" _r
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[[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
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read -r -p " $_q " _r
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eval "$_var='${_r:-$_def}'"
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}
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prompt_yn() {
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local _q="$1" _def="$2" _var="$3" _r
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[[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
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read -r -p " $_q " _r
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eval "$_var='${_r:-$_def}'"
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}
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prompt_reinstall_mode() {
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local _var="$1" _r
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if [[ "${UNATTENDED:-false}" == "true" ]]; then eval "$_var='cancel'"; return; fi
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echo " Already installed."
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read -r -p " (u)pdate / (f)resh reinstall / (c)ancel [c]: " _r
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case "${_r,,}" in
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u|update) eval "$_var='update'" ;;
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f|fresh) eval "$_var='fresh'" ;;
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*) eval "$_var='cancel'" ;;
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esac
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}
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generate_password() {
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local length="${1:-32}"
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openssl rand -base64 48 | tr -dc 'a-zA-Z0-9' | head -c "$length"
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}
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configure_caddy_for_service() {
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local _name="$1" _upstream="$2" _subdomain="$3" _extra="${4:-}"
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local _caddy_dir="$DOCKER_DIR/caddy"
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local _caddyfile="$_caddy_dir/Caddyfile"
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local _display_port="${_upstream##*:}"
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# Determine mode: local Caddy, remote Caddy, or none
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local _mode="none"
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[[ -d "$_caddy_dir" ]] && _mode="local"
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[[ -n "${CADDY_REMOTE_HOST:-}" ]] && [[ "$_mode" != "local" ]] && _mode="remote"
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[[ "$_mode" == "none" ]] && {
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log_info "Access $_name directly on port $_display_port."
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return 0
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}
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echo ""
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local _do_caddy=""
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if [[ "$_mode" == "remote" ]]; then
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log_info "Remote Caddy configured (${CADDY_REMOTE_HOST})."
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log_info "A snippet file will be saved to ~/docker/caddy-snippets/."
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fi
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read -r -p " Configure Caddy reverse proxy for $_name? [y/N]: " _do_caddy
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[[ "${_do_caddy,,}" == "y" ]] || {
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log_info "Skipping — access at: http://localhost:$_display_port"
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return 0
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}
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# Domain prompt — pre-fill from SITE_DOMAIN when available
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local _default_domain=""
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if [[ -n "${SITE_DOMAIN:-}" ]] && [[ "$SITE_DOMAIN" != "example.com" ]]; then
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_default_domain="${_subdomain}.${SITE_DOMAIN}"
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log_info "Default: $_default_domain"
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fi
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local _domain=""
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read -r -p " Domain [${_default_domain:-required}]: " _domain
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_domain="${_domain:-$_default_domain}"
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[[ -n "$_domain" ]] || { log_warning "No domain entered — skipping Caddy."; return 0; }
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# Build upstream — remote Caddy uses host IP:port, not container name
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local _block_upstream="$_upstream"
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if [[ "$_mode" == "remote" ]]; then
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_block_upstream="${CADDY_REMOTE_HOST}:${_display_port}"
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fi
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local _site_block
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_site_block="$(cat << CBLOCK
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# $_name
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${_domain} {
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reverse_proxy ${_block_upstream}
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header {
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Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
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X-Content-Type-Options "nosniff"
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X-Frame-Options "SAMEORIGIN"
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Referrer-Policy "strict-origin-when-cross-origin"
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}
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log {
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output file /var/log/caddy/${_domain}.log
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format json
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}
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${_extra}
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}
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CBLOCK
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)"
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if [[ "$_mode" == "local" ]]; then
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if [[ -f "$_caddyfile" ]]; then
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local _bk="$_caddy_dir/Caddyfile.backup.$(date +%Y%m%d-%H%M%S)"
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cp "$_caddyfile" "$_bk"
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log_info "Backed up Caddyfile to $(basename "$_bk")"
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else
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touch "$_caddyfile"
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fi
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if grep -q "^${_domain}" "$_caddyfile" 2>/dev/null; then
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log_warning "$_domain already in Caddyfile"
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local _ow=""
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read -r -p " Overwrite? [y/N]: " _ow
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[[ "${_ow,,}" == "y" ]] || { log_info "Keeping existing entry."; return 0; }
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sed -i "/^${_domain}/,/^}/d" "$_caddyfile"
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fi
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printf '%s\n' "$_site_block" >> "$_caddyfile"
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log_success "Added $_domain to Caddyfile"
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docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true
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if docker exec caddy caddy reload --config /etc/caddy/Caddyfile 2>/dev/null; then
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log_success "$_name accessible at: https://$_domain"
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else
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log_warning "Reload failed — check: docker logs caddy"
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log_info "Manual reload: docker exec caddy caddy reload --config /etc/caddy/Caddyfile"
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fi
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else
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local _snippet_dir="$DOCKER_DIR/caddy-snippets"
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local _snippet_file="$_snippet_dir/${_subdomain}.caddy"
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mkdir -p "$_snippet_dir"
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printf '%s\n' "$_site_block" > "$_snippet_file"
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chown "$ACTUAL_USER:$ACTUAL_USER" "$_snippet_file" 2>/dev/null || true
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log_success "Snippet saved: $_snippet_file"
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log_info "Copy to Caddy machine:"
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log_info " scp $_snippet_file caddy-host:~/caddy-snippets/"
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log_info " rsync -av $_snippet_dir/ caddy-host:~/caddy-snippets/ (all at once)"
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fi
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}
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write_readme() {
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local _dir="$1"; shift
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mkdir -p "$_dir"
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cat > "$_dir/README.md"
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}
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backup_if_exists() {
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local _file="$1"
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[ -f "$_file" ] || return 0
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cp -p "$_file" "${_file}.bak.$(date +%Y%m%d-%H%M%S)" 2>/dev/null
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}
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fi
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# Globals — ACTUAL_USER/ACTUAL_HOME must come before DOCKER_DIR
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# ($HOME under sudo is /root, not the real user's home)
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ACTUAL_USER="${ACTUAL_USER:-${SUDO_USER:-$USER}}"
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ACTUAL_HOME="$(getent passwd "$ACTUAL_USER" 2>/dev/null | cut -d: -f6 || echo "${HOME:-/root}")"
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DOCKER_DIR="${DOCKER_DIR:-$ACTUAL_HOME/docker}"
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DRY_RUN="${DRY_RUN:-false}"
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UNATTENDED="${UNATTENDED:-false}"
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SITE_TZ="${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}"
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SITE_DOMAIN="${SITE_DOMAIN:-example.com}"
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SITE_CADDY_NET="${SITE_CADDY_NET:-caddy_net}"
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register_service() { :; } # no-op — no wizard to register into
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_RUN_STANDALONE=1
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fi
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# ─────────────────────────────────────────────────────────────────────────────
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register_service anki-sync-server utilities "Self-hosted Anki flashcard sync server (spaced repetition, syncs across devices without AnkiWeb)" 8080
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install_anki-sync-server() {
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require_docker || return 1
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log_info "Installing Anki Sync Server..."
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# ── Instance selection ───────────────────────────────────────────────────
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# First instance keeps the plain "anki-sync-server" name/paths/port exactly
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# as before (zero behavior change for anyone with a single instance). Only
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# asking to add a second one introduces suffixed naming — same pattern as
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# services/ntfy.sh and services/homebox.sh. A second instance is a real
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# use case here (e.g. a second household wanting fully separate data on
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# the same box) even though one instance already supports multiple
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# independent accounts via SYNC_USER1/SYNC_USER2/... — see CLAUDE.md's
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# "Multi-instance services" section.
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local ANKI_DIR="$DOCKER_DIR/anki-sync-server"
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local INSTANCE_SUFFIX="" CONTAINER="anki-sync-server"
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local WEB_PORT="8080"
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if [ "$DRY_RUN" = true ]; then
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echo "[DRY-RUN] Would offer to add a new, separate instance if one already exists"
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echo "[DRY-RUN] Would create $ANKI_DIR(-<name>)"
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echo "[DRY-RUN] Would prompt for one or more sync accounts and generate passwords"
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echo "[DRY-RUN] Would write docker-compose.yml and .env"
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echo "[DRY-RUN] Would auto-scan for a free host port"
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return 0
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fi
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if [ -d "$ANKI_DIR" ]; then
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echo ""
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echo " Anki Sync Server is already installed at $ANKI_DIR."
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echo " 1) Manage that install (update / full reinstall / cancel)"
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echo " 2) Add a NEW, separate Anki Sync Server instance alongside it (its"
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echo " own data and port — full isolation)"
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echo ""
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local _TOP_CHOICE=""
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prompt_text " Choice [1/2]:" "1" _TOP_CHOICE
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if [ "$_TOP_CHOICE" = "2" ]; then
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local _suffix=""
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while true; do
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prompt_text " Short name for the new instance (letters/numbers/hyphens, e.g. 'family'):" "" _suffix
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_suffix="$(echo "$_suffix" | tr -cs 'a-zA-Z0-9-' '-' | sed 's/^-*//;s/-*$//')"
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if [ -z "$_suffix" ]; then
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log_warning "Name can't be empty."; continue
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fi
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if [ -d "$DOCKER_DIR/anki-sync-server-$_suffix" ]; then
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log_warning "anki-sync-server-$_suffix already exists — pick another name."; continue
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fi
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break
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done
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INSTANCE_SUFFIX="$_suffix"
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ANKI_DIR="$DOCKER_DIR/anki-sync-server-$_suffix"
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CONTAINER="anki-sync-server-$_suffix"
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log_info "New instance: $ANKI_DIR"
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else
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# "Manage that install" on THIS instance — the banner above promises
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# update/fresh/cancel, so actually offer it instead of falling straight
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# through into the same unconditional-overwrite flow as a new install.
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if [[ -f "$ANKI_DIR/docker-compose.yml" ]]; then
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local MODE=""
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prompt_reinstall_mode MODE
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case "$MODE" in
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update)
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log_info "Refreshing the Anki Sync Server image only — existing accounts, port, and Caddy setup are left as-is."
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( cd "$ANKI_DIR" && docker compose pull && docker compose up -d ) \
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&& log_success "Anki Sync Server image refreshed" \
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|| log_warning "Refresh failed — check: docker compose -f $ANKI_DIR/docker-compose.yml logs"
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return 0
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;;
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cancel)
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log_info "Leaving the existing install as-is."
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return 0
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;;
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fresh) ;; # fall through to the full install flow below
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esac
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fi
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fi
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fi
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# Scan for a free port unconditionally — not just when adding an explicit
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# additional instance. A plain first install can just as easily collide
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# with an unrelated service that already claimed this default port — see
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# CLAUDE.md's "Port collision avoidance" section.
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find_free_port WEB_PORT "$WEB_PORT"
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# ── Sync accounts ─────────────────────────────────────────────────────────
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# The official sync server has no signup flow of its own — accounts are
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# fixed credentials baked in as SYNC_USER1, SYNC_USER2, ... at container
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# start, one per line in .env. Ask for at least one now (each Anki client
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# — desktop, AnkiDroid, AnkiMobile — logs in with one of these) and offer
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# to add more for other people sharing this box, since a single instance
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# already keeps each account's collection completely separate.
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local ANKI_USERS=() ANKI_PASSWORDS=()
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local _u=""
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prompt_text " Username for your Anki sync account:" "$ACTUAL_USER" _u
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ANKI_USERS+=("$_u")
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ANKI_PASSWORDS+=("$(generate_password 24)")
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while true; do
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local _more=""
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prompt_yn " Add another Anki sync account (e.g. for a family member)? (y/n):" "n" _more
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[[ "$_more" =~ ^[Yy]$ ]] || break
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prompt_text " Username for the additional account:" "" _u
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if [ -z "$_u" ]; then
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log_warning "Name can't be empty."; continue
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fi
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ANKI_USERS+=("$_u")
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ANKI_PASSWORDS+=("$(generate_password 24)")
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if [ "${#ANKI_USERS[@]}" -ge 8 ]; then
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log_warning "That's plenty — stopping at 8 accounts. Add more later by editing .env and re-running 'docker compose up -d'."
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break
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fi
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done
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mkdir -p "$ANKI_DIR/data"
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ensure_docker_dir_ownership "$ANKI_DIR"
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cd "$ANKI_DIR" || return 1
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# Mirrors configure_caddy_for_service's own mode resolution (lib/common.sh):
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# explicit CADDY_MODE from the site config wins, then a local ~/docker/caddy,
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# then the legacy CADDY_REMOTE_HOST var. Only "local" joins caddy_net — a
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# remote Caddy box can't resolve container names on this host's bridge
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# network anyway; it reaches this service via the host's published port.
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local _CADDY_MODE="${CADDY_MODE:-none}"
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[ "$_CADDY_MODE" = "none" ] && [ -d "$DOCKER_DIR/caddy" ] && _CADDY_MODE="local"
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[ "$_CADDY_MODE" = "none" ] && [ -n "${CADDY_REMOTE_HOST:-}" ] && _CADDY_MODE="remote"
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local _CADDY_NET_BLOCK=""
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local _CADDY_NET_SECTION=""
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if [ "$_CADDY_MODE" = "local" ]; then
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_CADDY_NET_BLOCK=" networks:
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- caddy_net
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"
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_CADDY_NET_SECTION="
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networks:
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caddy_net:
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external: true
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name: ${SITE_CADDY_NET:-caddy_net}
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"
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fi
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# Build the SYNC_USERn=... lines for docker-compose.yml (compose-time
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# interpolation of ${ANKI_SYNC_USERn}/${ANKI_SYNC_PASSWORDn} from .env —
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# same \${VAR} pattern services/homebox.sh uses for its own .env values)
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# and the matching ANKI_SYNC_USERn/ANKI_SYNC_PASSWORDn lines for .env.
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local _COMPOSE_USER_LINES="" _ENV_USER_LINES="" i idx
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for i in "${!ANKI_USERS[@]}"; do
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idx=$((i + 1))
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_COMPOSE_USER_LINES+=" - SYNC_USER${idx}=\${ANKI_SYNC_USER${idx}}:\${ANKI_SYNC_PASSWORD${idx}}
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"
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_ENV_USER_LINES+="ANKI_SYNC_USER${idx}=${ANKI_USERS[$i]}
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ANKI_SYNC_PASSWORD${idx}=${ANKI_PASSWORDS[$i]}
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"
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done
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backup_if_exists docker-compose.yml
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cat > docker-compose.yml << ANKI_COMPOSE
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name: $CONTAINER
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services:
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anki-sync-server:
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image: afrima/anki-sync-server:latest
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container_name: $CONTAINER
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hostname: $CONTAINER
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restart: unless-stopped
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environment:
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- SYNC_HOST=0.0.0.0
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- SYNC_PORT=8080
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- SYNC_BASE=/data
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${_COMPOSE_USER_LINES} volumes:
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- ./data:/data
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ports:
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- "${WEB_PORT}:8080"
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${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
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ANKI_COMPOSE
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backup_if_exists .env
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cat > .env << ANKI_ENV
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TZ=${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}
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CADDY_NET=$SITE_CADDY_NET
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# One username/password pair per Anki sync account (SYNC_USER1, SYNC_USER2,
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# ... in docker-compose.yml). Enter these exact values as the account on
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# each Anki client (Preferences/Settings → self-hosted sync server). Add
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# more pairs by hand later (ANKI_SYNC_USER9=..., ANKI_SYNC_PASSWORD9=...)
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# and add the matching SYNC_USER9=\${ANKI_SYNC_USER9}:\${ANKI_SYNC_PASSWORD9}
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|
# line to docker-compose.yml, then 'docker compose up -d' to pick it up.
|
|
${_ENV_USER_LINES}
|
|
ANKI_ENV
|
|
chmod 600 .env
|
|
|
|
chown -R "$ACTUAL_USER:$ACTUAL_USER" "$ANKI_DIR"
|
|
|
|
echo ""
|
|
log_success "Anki Sync Server${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} configured at $ANKI_DIR (port $WEB_PORT)"
|
|
echo ""
|
|
echo " Sync accounts (also saved in $ANKI_DIR/.env):"
|
|
for i in "${!ANKI_USERS[@]}"; do
|
|
echo " ${ANKI_USERS[$i]} / ${ANKI_PASSWORDS[$i]}"
|
|
done
|
|
echo ""
|
|
|
|
# No Authelia gate here, unlike most other web-facing services in this
|
|
# repo: this is a raw HTTP sync API that the Anki client itself talks to
|
|
# (not a browser session), so a forward_auth login portal in front of it
|
|
# would just break every sync request instead of protecting anything.
|
|
# SYNC_USER1/SYNC_USER2/... above is this service's own auth boundary —
|
|
# same reasoning as the has-built-in-auth services in CLAUDE.md, just
|
|
# with no web UI to additionally gate.
|
|
configure_caddy_for_service "Anki Sync Server${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)}" "${CONTAINER}:8080" "anki${INSTANCE_SUFFIX:+-$INSTANCE_SUFFIX}"
|
|
|
|
local START=""
|
|
prompt_yn "Start Anki Sync Server${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} now? (y/n):" "y" START
|
|
if [ "$START" = "y" ] || [ "$START" = "Y" ]; then
|
|
docker compose up -d \
|
|
&& log_success "Anki Sync Server started" \
|
|
|| log_warning "Start failed — check: docker compose logs"
|
|
fi
|
|
|
|
write_readme "$ANKI_DIR" << MD
|
|
# Anki Sync Server${INSTANCE_SUFFIX:+ — $INSTANCE_SUFFIX}
|
|
|
|
Self-hosted sync server for the [Anki](https://apps.ankiweb.net/) flashcard
|
|
app — syncs your collection across devices without going through AnkiWeb.
|
|
Anki's own spaced-repetition scheduler (FSRS) gives failed cards more
|
|
repetition and correctly-recalled cards longer gaps automatically; nothing
|
|
here changes that, it's purely the sync backend.
|
|
$( [ -n "$INSTANCE_SUFFIX" ] && echo "
|
|
This is a separate, fully isolated instance (own data directory, own
|
|
accounts, own port) — not shared collections with another Anki Sync Server
|
|
instance.")
|
|
|
|
## Access
|
|
- Sync URL: $( [ -n "${CADDY_SERVICE_CONFIGURED:-}" ] && [ "$CADDY_SERVICE_CONFIGURED" = "true" ] && echo "https://${CADDY_SERVICE_DOMAIN}/" || echo "http://localhost:${WEB_PORT}/" )
|
|
- Accounts (username / password):
|
|
$(for i in "${!ANKI_USERS[@]}"; do echo " - ${ANKI_USERS[$i]} / ${ANKI_PASSWORDS[$i]}"; done)
|
|
|
|
Enter the Sync URL and one of the above accounts on each Anki client — see
|
|
the client setup section below for exactly where.
|
|
|
|
## Data
|
|
- Collections: \`$ANKI_DIR/data\`
|
|
- Credentials: \`$ANKI_DIR/.env\` (readable by $ACTUAL_USER only)
|
|
|
|
## Manage
|
|
\`\`\`bash
|
|
cd $ANKI_DIR
|
|
docker compose up -d
|
|
docker compose down
|
|
docker compose logs -f
|
|
docker compose pull && docker compose up -d
|
|
\`\`\`
|
|
MD
|
|
|
|
log_info "Full client setup + Quizlet import walkthrough written to $ANKI_DIR/README.md"
|
|
}
|
|
|
|
# ── Standalone execution ───────────────────────────────────────────────────
|
|
if [[ "${_RUN_STANDALONE:-0}" == "1" ]]; then
|
|
install_anki-sync-server
|
|
fi
|