mirror of
https://github.com/kevinveenbirkenbach/docker-volume-backup.git
synced 2026-10-20 09:45:37 +00:00
Kevin Veen-Birkenbach
07d819cb41
rsync -a expands to -rlptgoD, so the backup stored neither extended attributes nor ACLs nor hardlinks while the restore side asks for -aHAX. A generation therefore never held what a restore wants back, and rsync faithfully mirrored a snapshot that has none. Reproduced end to end against a source carrying user.oc.* attributes and a hardlink: with the old argv, getfattr -d -R over the generation returns nothing and the hardlink splits into two inodes; with -aHAX both sides come back identical to the source. That is the shape in which an OpenCloud volume survived a disaster-recovery drill with its files intact and its storage metadata gone, so its posix driver skipped every space it could no longer read. restore/files.py had the same gap on this repository's own restore path. Two consequences worth knowing. The first backup after this re-copies every attribute-carrying volume once, because rsync declines to hardlink against a generation whose xattrs do not match. And a backup destination on a filesystem without xattr support now fails the run instead of producing a generation that cannot be restored. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
99 lines
3.8 KiB
Python
99 lines
3.8 KiB
Python
"""Contract of the rsync invocation that copies a volume."""
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from __future__ import annotations
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import tempfile
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import unittest
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from pathlib import Path
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from unittest import mock
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from baudolo.backup import volume as mod
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class TestBackupVolume(unittest.TestCase):
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def copy(self, **kwargs) -> str:
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with tempfile.TemporaryDirectory() as tmp:
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defaults = {
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"versions_dir": tmp,
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"volume_name": "demo",
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"volume_dir": str(Path(tmp) / "gen" / "demo"),
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"authoritative": False,
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"source": "/var/lib/docker/volumes/demo/_data/",
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}
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defaults.update(kwargs)
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with mock.patch.object(mod, "execute_shell_command") as run:
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mod.backup_volume(
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defaults.pop("versions_dir"),
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defaults.pop("volume_name"),
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defaults.pop("volume_dir"),
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**defaults,
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)
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return run.call_args[0][0]
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def test_the_quick_check_pass_carries_no_checksum(self) -> None:
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self.assertNotIn("--checksum", self.copy(authoritative=False))
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def test_the_authoritative_pass_compares_by_content(self) -> None:
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self.assertIn("--checksum", self.copy(authoritative=True))
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def test_it_reads_from_the_given_source(self) -> None:
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command = self.copy(source="/snapshot/volumes/demo/_data/")
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self.assertIn("/snapshot/volumes/demo/_data/", command)
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def test_it_always_deletes_what_the_source_no_longer_has(self) -> None:
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self.assertIn("--delete", self.copy())
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def test_it_carries_no_kernel_objects_into_a_generation(self) -> None:
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self.assertIn("--no-D", self.copy())
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def test_it_stores_the_metadata_a_restore_has_to_give_back(self) -> None:
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self.assertIn("-aHAX", self.copy())
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def test_it_keeps_no_twin_of_what_the_second_pass_replaces(self) -> None:
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command = self.copy(authoritative=True)
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self.assertEqual(command[:3], ["rsync", "-aHAX", "-P"])
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self.assertNotIn("--backup", command)
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def test_it_creates_the_destination(self) -> None:
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with tempfile.TemporaryDirectory() as tmp:
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dest = Path(tmp) / "gen" / "demo"
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with mock.patch.object(mod, "execute_shell_command"):
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mod.backup_volume(
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tmp, "demo", str(dest), authoritative=False, source="/src/"
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)
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self.assertTrue((dest / "files").is_dir())
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def test_source_is_required(self) -> None:
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with self.assertRaises(TypeError):
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mod.backup_volume("/v", "demo", "/d", authoritative=False)
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def test_authoritative_is_required(self) -> None:
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with self.assertRaises(TypeError):
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mod.backup_volume("/v", "demo", "/d", source="/src/")
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class TestLastBackupDir(unittest.TestCase):
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def test_it_ignores_the_generation_being_written(self) -> None:
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with tempfile.TemporaryDirectory() as tmp:
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current = Path(tmp) / "20260101" / "demo" / "files"
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current.mkdir(parents=True)
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found = mod.get_last_backup_dir(tmp, "demo", str(current) + "/")
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self.assertIsNone(found)
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def test_it_finds_the_previous_generation(self) -> None:
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with tempfile.TemporaryDirectory() as tmp:
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older = Path(tmp) / "20260101" / "demo" / "files"
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older.mkdir(parents=True)
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current = Path(tmp) / "20260102" / "demo" / "files"
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current.mkdir(parents=True)
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found = mod.get_last_backup_dir(tmp, "demo", str(current) + "/")
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self.assertEqual(found, str(older) + "/")
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def test_a_first_run_has_no_predecessor(self) -> None:
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with tempfile.TemporaryDirectory() as tmp:
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self.assertIsNone(mod.get_last_backup_dir(tmp, "demo", f"{tmp}/x/"))
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if __name__ == "__main__":
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unittest.main()
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