feat(backup)!: mandatory repo-name and databases-csv, --only-files, --only-sql

Two defaults could not be right. --repo-name fell back to the literal 'backup-docker-to-local' while its help promised the git repo folder name, which nothing ever derived. --databases-csv pointed inside the installed package directory, where credentials must not live; when it applied, load_databases_df read a missing file as empty and the run finished without a single dump and without an error. Both are required now, --repo-name in the restore CLI too. The file itself may still be absent - babadcb's tolerance is untouched, only the path must be named.

--everything is withdrawn. Its one effect was to ignore --images-no-stop-required, which is what leaving that list empty already does, and its branch was the default path minus the requires_stop check. No caller, no test, and help and README described it differently.

--dump-only-sql becomes --only-sql, and --only-files joins it as the opposite half: no dumps at all, every volume as files. They form a mutually exclusive group. A host that only copies files has no business holding database passwords, so --databases-csv is not required there and is never read.

The smallest valid argv turned out to be written four times across the test tree; it now lives once. Withdrawn flags are listed in one place and proven to exit 2.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/e2e/test_e2e_only_files.py

@@ -0,0 +1,116 @@
+"""--only-files backs a database up as a file tree and asks for no credentials.
+
+The run deliberately passes no --databases-csv at all: a host that only copies
+files has no reason to hold database passwords, and requiring the file would
+make the flag useless there.
+"""
+
+import unittest
+
+from .helpers import (
+    POSTGRES_DATA_DIR,
+    POSTGRES_IMAGE,
+    backup_path,
+    cleanup_docker,
+    create_minimal_compose_dir,
+    ensure_empty_dir,
+    latest_version_dir,
+    require_docker,
+    run,
+    unique,
+    wait_for_postgres,
+)
+
+MARKER = "only-files-marker"
+
+
+class TestE2EOnlyFiles(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        require_docker()
+        cls.prefix = unique("baudolo-e2e-only-files")
+        cls.backups_dir = f"/tmp/{cls.prefix}/Backups"
+        ensure_empty_dir(cls.backups_dir)
+        cls.compose_dir = create_minimal_compose_dir(f"/tmp/{cls.prefix}")
+        cls.repo_name = cls.prefix
+
+        cls.pg_container = f"{cls.prefix}-pg"
+        cls.pg_volume = f"{cls.prefix}-pg-vol"
+        cls.containers = [cls.pg_container]
+        cls.volumes = [cls.pg_volume]
+
+        run(["docker", "volume", "create", cls.pg_volume])
+        run(
+            [
+                "docker",
+                "run",
+                "-d",
+                "--name",
+                cls.pg_container,
+                "-e",
+                "POSTGRES_PASSWORD=pgpw",
+                "-e",
+                "POSTGRES_DB=appdb",
+                "-e",
+                "POSTGRES_USER=postgres",
+                "-v",
+                f"{cls.pg_volume}:{POSTGRES_DATA_DIR}",
+                POSTGRES_IMAGE,
+            ]
+        )
+        wait_for_postgres(cls.pg_container, user="postgres", timeout_s=90)
+        run(
+            [
+                "docker",
+                "exec",
+                cls.pg_container,
+                "sh",
+                "-lc",
+                f"echo '{MARKER}' > {POSTGRES_DATA_DIR}/marker.txt",
+            ]
+        )
+
+        cp = run(
+            [
+                "baudolo",
+                "--compose-dir",
+                cls.compose_dir,
+                "--repo-name",
+                cls.repo_name,
+                "--backups-dir",
+                cls.backups_dir,
+                "--images-no-stop-required",
+                POSTGRES_IMAGE,
+                "--only-files",
+            ],
+            capture=True,
+            check=True,
+        )
+        cls.stdout = cp.stdout or ""
+        cls.hash, cls.version = latest_version_dir(cls.backups_dir, cls.repo_name)
+
+    @classmethod
+    def tearDownClass(cls) -> None:
+        cleanup_docker(containers=cls.containers, volumes=cls.volumes)
+
+    def _volume_dir(self):
+        return backup_path(
+            self.backups_dir, self.repo_name, self.version, self.pg_volume
+        )
+
+    def test_the_database_volume_is_backed_up_as_files(self) -> None:
+        marker = self._volume_dir() / "files" / "marker.txt"
+        self.assertTrue(marker.is_file(), f"expected a file backup at {marker}")
+        self.assertEqual(marker.read_text(encoding="utf-8").strip(), MARKER)
+
+    def test_no_dump_is_written(self) -> None:
+        sql_dir = self._volume_dir() / "sql"
+        dumps = list(sql_dir.glob("*.sql")) if sql_dir.exists() else []
+        self.assertEqual(dumps, [], f"did not expect any dump, found: {dumps}")
+
+    def test_the_missing_databases_csv_is_not_reported(self) -> None:
+        self.assertNotIn("databases.csv", self.stdout)
+
+
+if __name__ == "__main__":
+    unittest.main()