utils.py, bldr.py: support Python 3.12

By migrating from the deprecated pkg_resources API to
importlib_resources.

bldr/bldr.py

@@ -1,3 +1,4 @@
+import importlib_resources
 import logging
 import os
 import pwd
@@ -10,7 +11,7 @@
 from tempfile import TemporaryDirectory
 
 from .docker_utils import create_docker_client, DockerImageBuilder, DockerImage, DockerContainer, DEFAULT_DOCKER_TIMEOUT
-from .utils import BLDRError, BLDRSetupFailed, escape_docker_image_tag, get_resource
+from .utils import BLDRError, BLDRSetupFailed, escape_docker_image_tag
 
 
 PRE_BUILD_HOOK = "/hooks/pre-build"
@@ -106,7 +107,10 @@ def _build_image(self, tag: str, control_file: Optional[Path] = None) -> DockerI
 
         with TemporaryDirectory(prefix="bldr_docker_dir_") as tmp_dir:
             docker_files_dir = Path(tmp_dir).joinpath('docker_files')
-            shutil.copytree(str(get_resource('.')), str(docker_files_dir))
+            with importlib_resources.as_file(
+                    importlib_resources.files().joinpath('data')
+            ) as resource_dir:
+                shutil.copytree(resource_dir, docker_files_dir)
             if control_file is None:
                 docker_files_dir.joinpath('control').write_text('')
             else:

bldr/utils.py

@@ -1,7 +1,6 @@
 import os
 import pwd
 from pathlib import Path
-from pkg_resources import resource_filename
 
 
 class BLDRError(Exception):
@@ -19,10 +18,6 @@ def __init__(self, msg: str, exitcode: int = 1) -> None:
         super().__init__(msg, exitcode)
 
 
-def get_resource(path: str) -> Path:
-    return Path(resource_filename('bldr', str(Path('data', path))))
-
-
 def escape_docker_image_tag(tag: str) -> str:
     return tag.replace(":", "-").replace("/", "-")
 

requirements.in

@@ -1,2 +1,3 @@
 docker
 dockerpty
+importlib_resources

requirements.txt

@@ -14,6 +14,8 @@ dockerpty==0.4.1
     # via -r requirements.in
 idna==3.7
     # via requests
+importlib-resources==6.4.0
+    # via -r requirements.in
 requests==2.32.3
     # via docker
 six==1.16.0
@@ -22,3 +24,5 @@ urllib3==2.2.2
     # via
     #   docker
     #   requests
+zipp==3.19.2
+    # via importlib-resources

setup.py

@@ -54,6 +54,7 @@ def get_package_data():
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Topic :: System :: Systems Administration",
         "Topic :: Utilities",
     ],

test/unit/test_resources.py

@@ -0,0 +1,5 @@
+import importlib_resources
+
+
+def test_data_resource():
+    assert importlib_resources.files('bldr').joinpath('data').is_dir()