CurrenciCombo/scripts/deployment/install.sh

#!/usr/bin/env bash
# install.sh — idempotent first-time setup for CurrenciCombo on a systemd host.
#
# Intended to run ONCE per host as root (or with sudo). Running it again is
# safe: it will skip already-present artifacts and warn on conflicts.
#
# What this does:
#   1. Creates the `currencicombo` system user and /opt/currencicombo tree.
#   2. Installs nginx (Debian/Ubuntu or Alpine) if not present.
#   3. Ensures a local Postgres is running and creates a fresh
#      `currencicombo` role + DB (refuses to touch an existing one unless
#      --force-recreate is passed).
#   4. Ensures a local Redis is running.
#   5. Writes /etc/currencicombo/orchestrator.env from .env.prod.example,
#      auto-populating EVENT_SIGNING_SECRET and ORCHESTRATOR_API_KEYS with
#      fresh randoms the first time.
#   6. Installs /etc/currencicombo/webapp-nginx.conf.
#   7. Installs the two systemd units and runs `systemctl daemon-reload`.
#   8. Enables (does NOT start) both units. First start happens via
#      scripts/deployment/deploy-currencicombo-8604.sh after the first
#      successful build.
#
# This script is target-agnostic. It has no hardcoded IP / hostname /
# VLAN. The NPMplus ingress in front of it is configured separately —
# see scripts/deployment/README.md.

set -euo pipefail

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
APP_USER="currencicombo"
APP_HOME="/opt/currencicombo"
ETC_DIR="/etc/currencicombo"
LOG_DIR="/var/log/currencicombo"
REPO_DIR="/var/lib/currencicombo/repo"
ENV_FILE="${ETC_DIR}/orchestrator.env"
NGINX_FILE="${ETC_DIR}/webapp-nginx.conf"
SYSTEMD_DIR="/etc/systemd/system"

FORCE_RECREATE_DB=0
DRY_RUN=0
SKIP_NGINX_INSTALL=0

log()  { printf '[install] %s\n' "$*" >&2; }
warn() { printf '[install][WARN] %s\n' "$*" >&2; }
die()  { printf '[install][FATAL] %s\n' "$*" >&2; exit 1; }
run()  { if [[ "${DRY_RUN}" -eq 1 ]]; then printf '[install][dry-run] %s\n' "$*" >&2; else eval "$*"; fi; }

usage() {
  cat <<'USAGE'
Usage: sudo ./install.sh [--force-recreate-db] [--skip-nginx-install] [--dry-run]

  --force-recreate-db    DROP and recreate the currencicombo Postgres role
                         and DB even if they already exist. DESTRUCTIVE.
  --skip-nginx-install   Do not apt/apk install nginx (use if you already
                         have a custom nginx build in place).
  --dry-run              Print the commands that would run, don't run them.
USAGE
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --force-recreate-db)  FORCE_RECREATE_DB=1; shift ;;
    --skip-nginx-install) SKIP_NGINX_INSTALL=1; shift ;;
    --dry-run)            DRY_RUN=1; shift ;;
    -h|--help)            usage; exit 0 ;;
    *)                    die "unknown arg: $1" ;;
  esac
done

[[ "$EUID" -eq 0 ]] || die "must run as root (sudo)"

# ----------------------------------------------------------------------
# 1. User + tree
# ----------------------------------------------------------------------
if id "${APP_USER}" >/dev/null 2>&1; then
  log "user ${APP_USER} already exists"
else
  log "creating system user ${APP_USER}"
  run useradd --system --home-dir "${APP_HOME}" --shell /usr/sbin/nologin --user-group "${APP_USER}"
fi

for d in "${APP_HOME}" "${APP_HOME}/orchestrator" "${APP_HOME}/webapp" \
         "${APP_HOME}/webapp/dist" "${ETC_DIR}" "${LOG_DIR}" "${REPO_DIR}"; do
  run install -d -o "${APP_USER}" -g "${APP_USER}" -m 0755 "$d"
done
run chown "${APP_USER}:${APP_USER}" "${APP_HOME}" "${LOG_DIR}" "${REPO_DIR}"
run chmod 0750 "${ETC_DIR}"

# ----------------------------------------------------------------------
# 2. nginx (required by currencicombo-webapp.service)
# ----------------------------------------------------------------------
if [[ "${SKIP_NGINX_INSTALL}" -eq 0 ]]; then
  if command -v nginx >/dev/null 2>&1; then
    log "nginx already installed ($(nginx -v 2>&1 | head -1))"
  elif command -v apt-get >/dev/null 2>&1; then
    log "installing nginx via apt"
    run 'DEBIAN_FRONTEND=noninteractive apt-get update -q'
    run 'DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends nginx-light'
    # We use our own nginx.conf via -c, so disable the distro site.
    run systemctl disable --now nginx 2>/dev/null || true
  elif command -v apk >/dev/null 2>&1; then
    log "installing nginx via apk"
    run apk add --no-cache nginx
    run rc-update del nginx 2>/dev/null || true
  else
    die "no apt or apk available — install nginx manually or re-run with --skip-nginx-install"
  fi
fi
[[ -f /etc/nginx/mime.types ]] || warn "/etc/nginx/mime.types missing; webapp-nginx.conf may fail"

# ----------------------------------------------------------------------
# 3. Postgres role + DB
# ----------------------------------------------------------------------
if ! command -v psql >/dev/null 2>&1; then
  die "psql not on PATH — install Postgres on this host (e.g. apt install postgresql) before running install.sh"
fi

# Use the OS `postgres` superuser for DDL.
pg_role_exists() {
  sudo -u postgres psql -tAc "SELECT 1 FROM pg_roles WHERE rolname='${APP_USER}';" 2>/dev/null | grep -q 1
}
pg_db_exists() {
  sudo -u postgres psql -tAc "SELECT 1 FROM pg_database WHERE datname='${APP_USER}';" 2>/dev/null | grep -q 1
}

if pg_role_exists; then
  if [[ "${FORCE_RECREATE_DB}" -eq 1 ]]; then
    log "dropping existing role/DB (--force-recreate-db)"
    run "sudo -u postgres psql -c 'DROP DATABASE IF EXISTS ${APP_USER};'"
    run "sudo -u postgres psql -c 'DROP ROLE IF EXISTS ${APP_USER};'"
  else
    warn "Postgres role ${APP_USER} already exists — skipping role/DB creation. Re-run with --force-recreate-db to wipe."
  fi
fi

if ! pg_role_exists; then
  log "creating Postgres role ${APP_USER}"
  run "sudo -u postgres psql -c \"CREATE ROLE ${APP_USER} LOGIN;\""
fi
if ! pg_db_exists; then
  log "creating Postgres database ${APP_USER}"
  run "sudo -u postgres psql -c \"CREATE DATABASE ${APP_USER} OWNER ${APP_USER};\""
fi
# Peer auth from the currencicombo OS user → currencicombo DB role "just works"
# on Debian-style pg_hba (local all all peer). No password needed.

# ----------------------------------------------------------------------
# 4. Redis
# ----------------------------------------------------------------------
if systemctl list-unit-files | grep -q '^redis-server\.service'; then
  run systemctl enable --now redis-server
elif systemctl list-unit-files | grep -q '^redis\.service'; then
  run systemctl enable --now redis
elif command -v redis-cli >/dev/null 2>&1; then
  warn "redis-cli present but no redis-server.service / redis.service unit — assuming external Redis"
else
  warn "redis not detected; orchestrator will fall back to in-process event bus. Install redis for multi-replica support."
fi

# ----------------------------------------------------------------------
# 5. orchestrator.env
# ----------------------------------------------------------------------
if [[ -f "${ENV_FILE}" ]]; then
  log "${ENV_FILE} already exists — leaving alone"
else
  log "writing ${ENV_FILE}"
  install -o "${APP_USER}" -g "${APP_USER}" -m 0640 "${SCRIPT_DIR}/.env.prod.example" "${ENV_FILE}"
  # Auto-fill the two REQUIRED secrets so first boot doesn't crash.
  SECRET="$(openssl rand -hex 32)"
  INIT_KEY="$(openssl rand -hex 24)"
  SETT_KEY="$(openssl rand -hex 24)"
  AUD_KEY="$(openssl rand -hex 24)"
  run "sed -i 's|^EVENT_SIGNING_SECRET=.*|EVENT_SIGNING_SECRET=${SECRET}|' '${ENV_FILE}'"
  run "sed -i 's|^ORCHESTRATOR_API_KEYS=.*|ORCHESTRATOR_API_KEYS=${INIT_KEY}:initiator,${SETT_KEY}:settler,${AUD_KEY}:auditor|' '${ENV_FILE}'"
  log "  generated EVENT_SIGNING_SECRET (64 hex)"
  log "  generated 3 API keys (initiator/settler/auditor) — grep ${ENV_FILE}"
fi

# ----------------------------------------------------------------------
# 6. webapp-nginx.conf
# ----------------------------------------------------------------------
run install -o "${APP_USER}" -g "${APP_USER}" -m 0644 \
  "${SCRIPT_DIR}/webapp-nginx.conf" "${NGINX_FILE}"

# ----------------------------------------------------------------------
# 7. systemd units
# ----------------------------------------------------------------------
run install -o root -g root -m 0644 \
  "${SCRIPT_DIR}/systemd/currencicombo-orchestrator.service" \
  "${SYSTEMD_DIR}/currencicombo-orchestrator.service"
run install -o root -g root -m 0644 \
  "${SCRIPT_DIR}/systemd/currencicombo-webapp.service" \
  "${SYSTEMD_DIR}/currencicombo-webapp.service"
run systemctl daemon-reload

# ----------------------------------------------------------------------
# 8. Enable (but do NOT start yet — no build exists)
# ----------------------------------------------------------------------
run systemctl enable currencicombo-orchestrator.service
run systemctl enable currencicombo-webapp.service

log "install complete."
log "  next: run scripts/deployment/deploy-currencicombo-8604.sh as root to build + start."