a09860dc61
Runs at env module load so the backup fires ahead of offline and online migration paths, as well as alembic current / revision. A failing backup does not stop the migration: this is defense in depth, not a hard prerequisite, and the common failure case is "DB does not exist yet" on a fresh checkout. Refs #5 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
75 lines
1.9 KiB
Python
75 lines
1.9 KiB
Python
import subprocess
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from logging.config import fileConfig
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from pathlib import Path
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from sqlalchemy import engine_from_config, pool
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from alembic import context
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from quartermaster.config import DB_URL
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from quartermaster.models import Base
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def _backup_before_migrations() -> None:
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script = Path(__file__).resolve().parents[1] / "scripts" / "backup-db.sh"
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if not script.is_file():
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return
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result = subprocess.run(
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[str(script), "alembic"],
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check=False,
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capture_output=True,
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text=True,
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)
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if result.stdout:
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print(result.stdout, end="")
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if result.returncode != 0 and result.stderr:
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print(
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f"alembic: backup-db.sh returned {result.returncode}; "
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f"continuing without a fresh backup.\n{result.stderr}",
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)
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_backup_before_migrations()
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config = context.config
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config.set_main_option("sqlalchemy.url", DB_URL)
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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target_metadata = Base.metadata
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def run_migrations_offline() -> None:
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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render_as_batch=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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render_as_batch=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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