Drop dependency on Setuptools

Instead of relying on `setuptools` to get functionality from
`pkg_resources` (which is slowly being refactored away), leverage
`packaging` for the functionality used by Conda-Build.

conda_build/skeletons/cpan.py

@@ -7,7 +7,7 @@
 
 import codecs
 import hashlib
-from pkg_resources import parse_version
+from packaging.version import Version
 from glob import glob
 import gzip
 import json
@@ -231,7 +231,7 @@ def get_build_dependencies_from_src_archive(package_url, sha256, src_cache):
 
 
 def loose_version(ver):
-    return str(parse_version(str(ver)))
+    return str(Version(str(ver)))
 
 
 def get_cpan_api_url(url, colons):
@@ -438,7 +438,7 @@ def skeletonize(packages, output_dir=".", version=None,
             release_data = latest_release_data
         else:
             release_data = get_release_info(meta_cpan_url, cache_dir, core_modules, package,
-                                            parse_version(version))
+                                            Version(version))
 
         # Check if recipe directory already exists
         dir_path = join(output_dir, packagename, release_data['version'])
@@ -566,7 +566,7 @@ def is_core_version(core_version, version):
     if core_version is None:
         return False
     elif core_version is not None and ((version in [None, '']) or
-                                       (core_version >= parse_version(version))):
+                                       (core_version >= Version(version))):
         return True
     else:
         return False
@@ -619,7 +619,7 @@ def latest_pkg_version(pkg):
     except:
         pkg_list = None
     if pkg_list:
-        pkg_version = parse_version(pkg_list[-1].version)
+        pkg_version = Version(pkg_list[-1].version)
     else:
         pkg_version = None
     return pkg_version
@@ -707,7 +707,7 @@ def deps_for_package(package, release_data, output_dir, cache_dir,
                 # There is a dep version and a pkg_version ... why?
                 if dep_dict['version'] in {'', 'undef'}:
                     dep_dict['version'] = '0'
-                dep_version = parse_version(dep_dict['version'])
+                dep_version = Version(dep_dict['version'])
 
                 # Make sure specified version is valid
                 # TODO def valid_release_info
@@ -718,7 +718,7 @@ def deps_for_package(package, release_data, output_dir, cache_dir,
                            'dependency for %s, %s, is not available on MetaCPAN, ' +
                            'so we are just assuming the latest version is ' +
                            'okay.') % (orig_dist, package, str(dep_version)))
-                    dep_version = parse_version('0')
+                    dep_version = Version('0')
 
                 # Add version number to dependency, if it's newer than latest
                 # we have package for.
@@ -991,12 +991,12 @@ def get_release_info(cpan_url, cache_dir, core_modules, package, version):
     if version is not None:
         version_str = str(version)
         rel_version = str(rel_dict['version'])
-        loose_str = str(parse_version(version_str))
+        loose_str = str(Version(version_str))
 
         try:
             version_mismatch = (version is not None) and (
                 loose_version('0') != loose_version(version_str) and
-                parse_version(rel_version) != loose_version(version_str))
+                Version(rel_version) != loose_version(version_str))
             # print(version_mismatch)
         except Exception as e:
             print('We have some strange version mismatches. Please investigate.')

conda_build/skeletons/pypi.py

@@ -12,7 +12,7 @@
 from os import makedirs, listdir, getcwd, chdir
 from os.path import join, isdir, exists, isfile, abspath
 
-from pkg_resources import parse_version
+from packaging.version import Version
 import re
 from shutil import copy2
 import subprocess
@@ -277,7 +277,7 @@ def skeletonize(packages, output_dir=".", version=None, recursive=False,
 
             pypi_data = pypi_resp.json()
 
-            versions = sorted(pypi_data["releases"].keys(), key=parse_version)
+            versions = sorted(pypi_data["releases"].keys(), key=Version)
 
             if version_compare:
                 version_compare(versions)

conda_build/variants.py

@@ -8,7 +8,7 @@
 from functools import lru_cache
 from itertools import product
 import os.path
-from pkg_resources import parse_version
+from packaging.version import Version
 import re
 import sys
 
@@ -87,9 +87,9 @@
 def _get_default_compilers(platform, py_ver):
     compilers = DEFAULT_COMPILERS[platform].copy()
     if platform == 'win':
-        if parse_version(py_ver) >= parse_version('3.5'):
+        if Version(py_ver) >= Version('3.5'):
             py_ver = '3.5'
-        elif parse_version(py_ver) <= parse_version('3.2'):
+        elif Version(py_ver) <= Version('3.2'):
             py_ver = '2.7'
         compilers['c'] = compilers['c'][py_ver]
         compilers['cxx'] = compilers['cxx'][py_ver]

recipe/meta.yaml

@@ -34,6 +34,7 @@ requirements:
     - filelock
     - futures       # [py<3]
     - jinja2
+    - packaging
     - patchelf      # [linux]
     - patch     >=2.6   # [not win]
     - m2-patch  >=2.6   # [win]
@@ -44,7 +45,6 @@ requirements:
     - pyyaml
     - requests
     - scandir       # [py<34]
-    - setuptools
     - six
     - glob2  >=0.6
     - pytz

setup.py

@@ -26,7 +26,7 @@
     "psutil",
     "six",
     "libarchive-c",
-    "setuptools",
+    "packaging",
     # "conda-package-handling",  # remove comment once released on PyPI
     "glob2",
 ]

tests/test_api_skeleton.py

@@ -5,7 +5,7 @@
 import subprocess
 import sys
 
-from pkg_resources import parse_version
+from packaging.version import Version
 import pytest
 
 from conda_build.skeletons.pypi import get_package_metadata, \
@@ -342,7 +342,7 @@ def test_pypi_version_sorting(testing_workdir, testing_config):
     # any effect.
     api.skeletonize(packages='impyla', repo='pypi', config=testing_config)
     m = api.render('impyla')[0][0]
-    assert parse_version(m.version()) >= parse_version("0.13.8")
+    assert Version(m.version()) >= Version("0.13.8")
 
 
 def test_list_skeletons():
@@ -359,7 +359,7 @@ def test_pypi_with_version_arg(testing_workdir):
     # regression test for https://github.com/conda/conda-build/issues/1442
     api.skeletonize('PrettyTable', 'pypi', version='0.7.2')
     m = api.render('prettytable')[0][0]
-    assert parse_version(m.version()) == parse_version("0.7.2")
+    assert Version(m.version()) == Version("0.7.2")
 
 
 @pytest.mark.slow
@@ -373,7 +373,7 @@ def test_pypi_with_extra_specs(testing_workdir, testing_config):
     api.skeletonize('bigfile', 'pypi', extra_specs=extra_specs,
                     version='0.1.24', python="3.6", config=testing_config)
     m = api.render('bigfile')[0][0]
-    assert parse_version(m.version()) == parse_version("0.1.24")
+    assert Version(m.version()) == Version("0.1.24")
     assert any('cython' in req for req in m.meta['requirements']['host'])
     assert any('mpi4py' in req for req in m.meta['requirements']['host'])
 
@@ -389,7 +389,7 @@ def test_pypi_with_version_inconsistency(testing_workdir, testing_config):
     api.skeletonize('mpi4py_test', 'pypi', extra_specs=extra_specs,
                     version='0.0.10', python="3.6", config=testing_config)
     m = api.render('mpi4py_test')[0][0]
-    assert parse_version(m.version()) == parse_version("0.0.10")
+    assert Version(m.version()) == Version("0.0.10")
 
 
 def test_pypi_with_basic_environment_markers(testing_workdir):