zulip/scripts/setup/terminate-psql-sessions

#!/usr/bin/env bash
set -e

POSTGRES_USER="postgres"
if [ "$(uname)" = "OpenBSD" ]; then
  POSTGRES_USER="_postgresql"
fi

cd /

username=$1

shift
tables="$(printf "'%s'," "${@//\'/\'\'}")"
tables="${tables%,}"

case "$(id -un)" in
root)
    psql=(su -s /usr/bin/env - -- "$POSTGRES_USER" psql postgres "$POSTGRES_USER")
    ;;
"$POSTGRES_USER")
    psql=(psql postgres "$POSTGRES_USER")
    ;;
*)
    psql=(psql -h localhost postgres "$username")
    ;;
esac

"${psql[@]}" <<EOF
SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname IN ($tables);
EOF