No longer rely on pkg_resources

Signed-off-by: Katharina Dröge <kate@commandmc.de>

README.md

@@ -298,24 +298,8 @@ The available plugins can be listed with `whipper cd rip -h`. Specify a logger t
 whipper cd rip -L eac
 ```
 
-Whipper searches for logger plugins in the following paths:
-
-- `$XDG_DATA_HOME/whipper/plugins`
-- Paths returned by the following Python instruction:
-
-  `[x + '/whipper/plugins' for x in site.getsitepackages()]`
-
-- If whipper is run in a `virtualenv`, it will use these alternative instructions (from `distutils.sysconfig`):
-  - `get_python_lib(plat_specific=False, standard_lib=False, prefix='/usr/local') + '/whipper/plugins'`
-  - `get_python_lib(plat_specific=False, standard_lib=False) + '/whipper/plugins'`
-
-On a default Debian/Ubuntu installation, the following paths are searched by whipper:
-
-- `$HOME/.local/share/whipper/plugins`
-- `/usr/local/lib/python3.X/dist-packages/whipper/plugins`
-- `/usr/lib/python3.X/dist-packages/whipper/plugins`
-
-Where `X` stands for the minor version of the Python 3 release available on the system.
+Whipper searches for logger plugins using `importlib.metadata.entry_points`, meaning any package visible to the Python
+interpreter exporting a `whipper.logger` entry point will be loaded.
 
 Please note that locally installed logger plugins won't be recognized when whipper has been installed through the official Docker image.
 

requirements.txt

@@ -4,3 +4,4 @@ pycdio>0.20
 ruamel.yaml
 setuptools_scm
 discid
+packaging

whipper/__init__.py

@@ -2,11 +2,11 @@ import logging
 import os
 import sys
 
-from pkg_resources import (get_distribution,
-                           DistributionNotFound, RequirementParseError)
+from importlib.metadata import version, PackageNotFoundError
+
 try:
-    __version__ = get_distribution(__name__).version
-except (DistributionNotFound, RequirementParseError):
+    __version__ = version('whipper')
+except PackageNotFoundError:
     # not installed as package or is being run from source/git checkout
     from setuptools_scm import get_version
     __version__ = get_version()

whipper/command/main.py

@@ -3,14 +3,11 @@
 
 import os
 import sys
-import pkg_resources
 import musicbrainzngs
-import site
 import whipper
-from distutils.sysconfig import get_python_lib
 from whipper.command import cd, offset, drive, image, accurip, mblookup
 from whipper.command.basecommand import BaseCommand
-from whipper.common import common, directory, config
+from whipper.common import common, config
 from whipper.extern.task import task
 from whipper.program.utils import eject_device
 
@@ -35,22 +32,6 @@ def main():
                        "to make it work in whipper.", server['netloc'])
         musicbrainzngs.set_hostname(server['netloc'])
 
-    # Find whipper's plugins paths (local paths have higher priority)
-    plugins_p = [directory.data_path('plugins')]  # local path (in $HOME)
-    if hasattr(sys, 'real_prefix'):  # no getsitepackages() in virtualenv
-        plugins_p.append(
-            get_python_lib(plat_specific=False, standard_lib=False,
-                           prefix='/usr/local') + '/whipper/plugins')
-        plugins_p.append(get_python_lib(plat_specific=False,
-                         standard_lib=False) + '/whipper/plugins')
-    else:
-        plugins_p += [x + '/whipper/plugins' for x in site.getsitepackages()]
-
-    # register plugins with pkg_resources
-    distributions, _ = pkg_resources.working_set.find_plugins(
-        pkg_resources.Environment(plugins_p)
-    )
-    list(map(pkg_resources.working_set.add, distributions))
     try:
         cmd = Whipper(sys.argv[1:], os.path.basename(sys.argv[0]), None)
         ret = cmd.do()

whipper/common/program.py

@@ -27,6 +27,8 @@ import shutil
 import time
 
 from tempfile import NamedTemporaryFile
+from packaging.version import Version
+
 from whipper.common import accurip, checksum, common, mbngs, path
 from whipper.program import cdrdao, cdparanoia
 from whipper.result import result
@@ -99,9 +101,8 @@ class Program:
 
         Also warn about buggy cdrdao versions.
         """
-        from pkg_resources import parse_version as V
         version = cdrdao.version()
-        if V(version) < V('1.2.3rc2'):
+        if Version(version) < Version('1.2.3rc2'):
             logger.warning('cdrdao older than 1.2.3 has a pre-gap length bug.'
                            ' See http://sourceforge.net/tracker/?func=detail&aid=604751&group_id=2171&atid=102171')  # noqa: E501
 

whipper/result/result.py

@@ -18,7 +18,7 @@
 # You should have received a copy of the GNU General Public License
 # along with whipper.  If not, see <http://www.gnu.org/licenses/>.
 
-import pkg_resources
+from importlib.metadata import entry_points
 import time
 
 
@@ -157,7 +157,7 @@ def getLoggers():
     """
     d = {}
 
-    pluggables = list(pkg_resources.iter_entry_points("whipper.logger"))
+    pluggables = list(entry_points(group="whipper.logger"))
     for entrypoint in [EntryPoint(), ] + pluggables:
         plugin_class = entrypoint.load()
         d[entrypoint.name] = plugin_class