issue2551183 - Replace references to distutils in roundup/dist/command

First pass at fixing this. Seems to work in:

  native install
  virtual env

python 2.7 and 3.6. Also docker python 3.  Could use more testing
though.

Author: rouilj

roundup/dist/command/bdist_rpm.py

@@ -3,10 +3,22 @@
 # All rights reserved.
 # For license terms see the file COPYING.txt.
 #
-from distutils.command.bdist_rpm import bdist_rpm as base
-from distutils.file_util import write_file
+# converted to not use distutils 2021
+from setuptools.command.bdist_rpm import bdist_rpm as base
 import os
 
+# cribbed from 2.7 distutils
+def write_file (filename, contents):
+    """Create a file with the specified name and write 'contents' (a
+    sequence of strings without line terminators) to it.
+    """
+    f = open(filename, "w")
+    try:
+        for line in contents:
+            f.write(line + "\n")
+    finally:
+        f.close()
+
 class bdist_rpm(base):
 
     def finalize_options(self):

roundup/dist/command/build.py

@@ -5,7 +5,11 @@
 #
 from __future__ import print_function
 from roundup import msgfmt
-from distutils.command.build import build as base
+try:
+    from setuptool.command.install import install as base
+    raise ImportError
+except ImportError:
+    from distutils.command.build import build as base
 import os
 from glob import glob
 
@@ -24,10 +28,11 @@ def check_manifest():
     """Check that the files listed in the MANIFEST are present when the
     source is unpacked.
     """
+    manifest_file = 'roundup.egg-info/SOURCES.txt'
     try:
-        f = open('MANIFEST')
+        f=open(manifest_file)
     except:
-        print('\n*** SOURCE WARNING: The MANIFEST file is missing!')
+        print('\n*** SOURCE WARNING: The MANIFEST file "%s" is missing!' % manifest_file)
         return
     try:
         manifest = [l.strip() for l in f.readlines()]

roundup/dist/command/build_doc.py

@@ -8,14 +8,26 @@
 import os.path
 import glob
 
-from distutils.command import build
-from distutils.spawn import spawn, find_executable
-from distutils.dep_util import newer, newer_group
-from distutils.dir_util import copy_tree, remove_tree, mkpath
-from distutils.file_util import copy_file
-from distutils import sysconfig
-
-class build_doc(build.build):
+try:
+    from setuptools.command.install import install as _build_py
+    raise ImportError
+except ImportError:
+    from distutils.command.build import build as _build_py  # try/except clause
+    orig_build = _build_py
+
+try:
+    # would be nice to use setuptools.Command.spawn() as it
+    # obeys the dry-run flag.
+    from subprocess import run as spawn
+except ImportError:
+    from distutils.spawn import spawn  # try/except: in except for subprocess
+
+try:
+    from distutils.spawn import find_executable # try/except: in try local find
+except ImportError:
+    from roundup.dist.command import find_executable
+
+class build_doc(_build_py):
     """Defines the specific procedure to build roundup's documentation."""
 
     description = "build documentation"

roundup/dist/command/install_lib.py

@@ -1,5 +1,5 @@
 from roundup.dist.command.build import build_message_files, check_manifest
-from distutils.command.install_lib import install_lib as base
+from setuptools.command.install_lib import install_lib as base
 
 class install_lib(base):