Restore bagit-python 1.8.1

A direct dependency on 5b772435 worked locally but PyPI rejected it with the
following error:

WARNING  Error during upload. Retry with the --verbose option for more details.
ERROR    HTTPError: 400 Bad Request from https://upload.pypi.org/legacy/
         Can't have direct dependency: bagit@
         git+https://github.com/LibraryOfCongress/bagit-python. See
         https://packaging.python.org/specifications/core-metadata for more
         information.

CHANGELOG.rst

@@ -31,11 +31,6 @@ Changed
 - Replace ``pip``, ``pip-tools`` and ``virtualenv`` with ``uv``.
 - Update dependencies.
 
-Removed
--------
-
-- Remove ``shim_pkg_resources`` (bagit-python now uses ``importlib.metadata``).
-
 .. _changelog-0.7.10:
 
 0.7.10 — 2024-03-21

a3m/cli/__init__.py

@@ -0,0 +1,28 @@
+import sys
+from importlib.metadata import version
+
+
+def shim_pkg_resources():
+    """Injects a pkg_resources fake needed by bagit-python in Python 3.12.
+
+    The underlying error is only reproducible if setuptools is not installed.
+    """
+
+    class Distribution:
+        def __init__(self, name):
+            self.version = version(name)
+
+    class FakeDistributionNotFound(Exception):
+        pass
+
+    def fake_get_distribution(_, name):
+        return Distribution(name)
+
+    class PkgResources:
+        DistributionNotFound = FakeDistributionNotFound
+        get_distribution = fake_get_distribution
+
+    sys.modules["pkg_resources"] = PkgResources()  # type: ignore
+
+
+shim_pkg_resources()

pyproject.toml

@@ -18,7 +18,7 @@ dependencies = [
   # Used by client modules
   "ammcpc~=0.1",
   "metsrw~=0.4",
-  "bagit @ git+https://github.com/LibraryOfCongress/bagit-python",
+  "bagit~=1.8",
   "lxml~=4.9",
   "unidecode~=1.3",
   "pygfried~=0.6",

requirements-dev.txt

@@ -12,7 +12,7 @@ attrs==23.2.0
     #   scriv
 babel==2.14.0
     # via sphinx
-bagit @ git+https://github.com/LibraryOfCongress/bagit-python@5b7724356d8c5c3a3be9120814d4d996574485a9
+bagit==1.8.1
 boto3==1.34.87
 botocore==1.34.87
     # via

requirements.txt

@@ -7,7 +7,7 @@ attrs==23.2.0
     # via
     #   jsonschema
     #   referencing
-bagit @ git+https://github.com/LibraryOfCongress/bagit-python@5b7724356d8c5c3a3be9120814d4d996574485a9
+bagit==1.8.1
 boto3==1.34.87
 botocore==1.34.87
     # via