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--everything is withdrawn.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 Withdrawn flags are listed in one place and proven to exit 2.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/unit/backup/test_cli.py

@@ -7,7 +7,7 @@ from unittest import mock
 
 from baudolo.backup.cli import parse_args
 
-REQUIRED = ["--compose-dir", "/compose", "--backups-dir", "/backups"]
+from . import REQUIRED, REQUIRED_PAIRS
 
 
 def parse(*extra: str):
@@ -68,19 +68,42 @@ class TestSnapshotFlags(unittest.TestCase):
 
 
 class TestRequiredFlags(unittest.TestCase):
-    def test_backups_dir_is_required(self) -> None:
-        with (
-            mock.patch("sys.argv", ["baudolo", "--compose-dir", "/compose"]),
-            self.assertRaises(SystemExit),
-        ):
-            parse_args()
+    def test_no_flag_falls_back_to_a_default(self) -> None:
+        for omitted, _ in REQUIRED_PAIRS:
+            argv = [a for pair in REQUIRED_PAIRS if pair[0] != omitted for a in pair]
+            with (
+                self.subTest(omitted=omitted),
+                mock.patch("sys.argv", ["baudolo", *argv]),
+                self.assertRaises(SystemExit),
+            ):
+                parse_args()
 
-    def test_compose_dir_is_required(self) -> None:
-        with (
-            mock.patch("sys.argv", ["baudolo", "--backups-dir", "/backups"]),
-            self.assertRaises(SystemExit),
-        ):
-            parse_args()
+
+class TestBackupScope(unittest.TestCase):
+    """--only-sql and --only-files name the two halves a generation can hold."""
+
+    def test_both_halves_by_default(self) -> None:
+        args = parse()
+        self.assertFalse(args.only_sql)
+        self.assertFalse(args.only_files)
+
+    def test_either_half_alone_is_accepted(self) -> None:
+        self.assertTrue(parse("--only-sql").only_sql)
+        self.assertTrue(parse("--only-files").only_files)
+
+    def test_asking_for_both_halves_alone_is_rejected(self) -> None:
+        with self.assertRaises(SystemExit):
+            parse("--only-sql", "--only-files")
+
+    def test_only_files_needs_no_databases_csv(self) -> None:
+        argv = [
+            arg
+            for pair in REQUIRED_PAIRS
+            if pair[0] != "--databases-csv"
+            for arg in pair
+        ]
+        with mock.patch("sys.argv", ["baudolo", *argv, "--only-files"]):
+            self.assertIsNone(parse_args().databases_csv)
 
 
 if __name__ == "__main__":