[Unit]
Description=Restart KCG Backend on deploy

[Service]
Type=oneshot
ExecStart=/bin/bash -c '\
  DEPLOY_DIR=/devdata/services/kcg/backend; \
  SYSTEMD_DIR=/etc/systemd/system; \
  CHANGED=0; \
  for f in kcg-backend.service kcg-backend-watcher.service kcg-backend-watcher.path; do \
    if [ -f "$DEPLOY_DIR/$f" ] && ! diff -q "$DEPLOY_DIR/$f" "$SYSTEMD_DIR/$f" >/dev/null 2>&1; then \
      cp "$DEPLOY_DIR/$f" "$SYSTEMD_DIR/$f"; \
      CHANGED=1; \
    fi; \
  done; \
  [ "$CHANGED" = "1" ] && systemctl daemon-reload; \
  systemctl restart kcg-backend'