"""ghost — BACKUP overlay (Phase 1e HC3 / Phase 2 P4): assertion-only + additive.

ops.pre_backup seeded ci_marker='original' into the MySQL `ghost` DB before the backup op (the
recipe's backupbot pre-hook runs `mysqldump ... ghost --tab /var/lib/mysql-files/`, dumping every
`ghost` table — including ci_marker — into the backed-up path). The orchestrator performed the
backup once. This overlay ADDS: the seeded row is intact in the live DB at backup time. The
backup→restore divergence (dropping the table) is in ops.pre_restore.
"""

import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
from harness import lifecycle  # noqa: E402


def _mysql(domain, sql):
    cmd = (
        'MYSQL_PWD="$(cat /run/secrets/db_password)" '
        f'mysql -u root -N -s ghost -e "{sql}"'
    )
    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()


def test_backup_captures_state(live_app):
    assert _mysql(live_app, "SELECT v FROM ci_marker;") == "original", (
        "the seeded ghost MySQL marker was not present at backup time"
    )