From 227484b679bff1f9856bd54921aaea9ba8ef16e0 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Tue, 12 May 2026 18:41:34 +0200
Subject: [PATCH] remove the superfluous borg.checksums module

---
 scripts/make.py                      |  1 -
 setup.py                             |  5 -----
 src/borg/archiver/benchmark_cmd.py   |  2 +-
 src/borg/checksums.pyi               |  1 -
 src/borg/checksums.pyx               |  6 ------
 src/borg/legacy/repository.py        |  2 +-
 src/borg/testsuite/checksums_test.py | 23 -----------------------
 7 files changed, 2 insertions(+), 38 deletions(-)
 delete mode 100644 src/borg/checksums.pyi
 delete mode 100644 src/borg/checksums.pyx
 delete mode 100644 src/borg/testsuite/checksums_test.py

diff --git a/scripts/make.py b/scripts/make.py
index 3b71b01c6..d1e52613f 100644
--- a/scripts/make.py
+++ b/scripts/make.py
@@ -561,7 +561,6 @@ src/borg/chunkers/buzhash64.pyx
 src/borg/chunkers/reader.pyx
 src/borg/hashindex.pyx
 src/borg/item.pyx
-src/borg/checksums.pyx
 src/borg/platform/posix.pyx
 src/borg/platform/linux.pyx
 src/borg/platform/syncfilerange.pyx
diff --git a/setup.py b/setup.py
index 07b763515..c95c09ed5 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,6 @@ buzhash64_source = "src/borg/chunkers/buzhash64.pyx"
 reader_source = "src/borg/chunkers/reader.pyx"
 hashindex_source = "src/borg/hashindex.pyx"
 item_source = "src/borg/item.pyx"
-checksums_source = "src/borg/checksums.pyx"
 platform_posix_source = "src/borg/platform/posix.pyx"
 platform_linux_source = "src/borg/platform/linux.pyx"
 platform_syncfilerange_source = "src/borg/platform/syncfilerange.pyx"
@@ -72,7 +71,6 @@ cython_sources = [
     reader_source,
     hashindex_source,
     item_source,
-    checksums_source,
     platform_posix_source,
     platform_linux_source,
     platform_syncfilerange_source,
@@ -163,8 +161,6 @@ if not on_rtd:
         dict(extra_compile_args=cflags),
     )
 
-    checksums_ext_kwargs = members_appended(dict(sources=[checksums_source]), dict(extra_compile_args=cflags))
-
     if sys.platform == "linux":
         linux_ext_kwargs = members_appended(
             dict(sources=[platform_linux_source]),
@@ -184,7 +180,6 @@ if not on_rtd:
         Extension("borg.chunkers.buzhash", [buzhash_source], extra_compile_args=cflags),
         Extension("borg.chunkers.buzhash64", [buzhash64_source], extra_compile_args=cflags),
         Extension("borg.chunkers.reader", [reader_source], extra_compile_args=cflags),
-        Extension("borg.checksums", **checksums_ext_kwargs),
     ]
 
     posix_ext = Extension("borg.platform.posix", [platform_posix_source], extra_compile_args=cflags)
diff --git a/src/borg/archiver/benchmark_cmd.py b/src/borg/archiver/benchmark_cmd.py
index 1903909b8..6cf5a4f1e 100644
--- a/src/borg/archiver/benchmark_cmd.py
+++ b/src/borg/archiver/benchmark_cmd.py
@@ -216,7 +216,7 @@ class BenchmarkMixIn:
                 print(f"{spec:<24} {format_file_size(size):<10} {dt:.3f}s")
 
         from xxhash import xxh64
-        from ..checksums import crc32
+        from zlib import crc32
 
         if not args.json:
             print("Non-cryptographic checksums / hashes ===========================")
diff --git a/src/borg/checksums.pyi b/src/borg/checksums.pyi
deleted file mode 100644
index 35bab571f..000000000
--- a/src/borg/checksums.pyi
+++ /dev/null
@@ -1 +0,0 @@
-def crc32(data: bytes, value: int = 0) -> int: ...
diff --git a/src/borg/checksums.pyx b/src/borg/checksums.pyx
deleted file mode 100644
index ccf15f198..000000000
--- a/src/borg/checksums.pyx
+++ /dev/null
@@ -1,6 +0,0 @@
-import zlib
-
-
-# Borg 2.0 repositories do not compute CRC32 over large amounts of data,
-# so speed does not matter much anymore, and we can just use zlib.crc32.
-crc32 = zlib.crc32
diff --git a/src/borg/legacy/repository.py b/src/borg/legacy/repository.py
index 288c5a60d..60e375e3e 100644
--- a/src/borg/legacy/repository.py
+++ b/src/borg/legacy/repository.py
@@ -11,6 +11,7 @@ from configparser import ConfigParser
 from functools import partial
 from itertools import islice
 from collections.abc import Callable
+from zlib import crc32
 
 import xxhash
 
@@ -28,7 +29,6 @@ from ..logger import create_logger
 from ..manifest import Manifest, NoManifestError
 from ..platform import SaveFile, SyncFile, sync_dir, safe_fadvise
 from ..repoobj import RepoObj
-from ..checksums import crc32
 from ..crypto.file_integrity import IntegrityCheckedFile, FileIntegrityError
 
 logger = create_logger(__name__)
diff --git a/src/borg/testsuite/checksums_test.py b/src/borg/testsuite/checksums_test.py
deleted file mode 100644
index a799bf6e8..000000000
--- a/src/borg/testsuite/checksums_test.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from xxhash import xxh64
-
-from ..helpers import hex_to_bin
-
-
-def test_xxh64():
-    assert xxh64(b"test", 123).hexdigest() == "2b81b9401bef86cf"
-    assert xxh64(b"test").hexdigest() == "4fdcca5ddb678139"
-    assert (
-        xxh64(
-            hex_to_bin(
-                "6f663f01c118abdea553373d5eae44e7dac3b6829b46b9bbeff202b6c592c22d724"
-                "fb3d25a347cca6c5b8f20d567e4bb04b9cfa85d17f691590f9a9d32e8ccc9102e9d"
-                "cf8a7e6716280cd642ce48d03fdf114c9f57c20d9472bb0f81c147645e6fa3d331"
-            )
-        ).hexdigest()
-        == "35d5d2f545d9511a"
-    )
-
-    hasher = xxh64(seed=123)
-    hasher.update(b"te")
-    hasher.update(b"st")
-    assert hasher.hexdigest() == "2b81b9401bef86cf"