Add files referenced by file: directive in setup.cfg to sdist

3 files changed, 24 insertions, 5 deletions

diff --git a/setuptools/command/egg_info.py b/setuptools/command/egg_info.py
index 1885efb0..194230a9 100644
--- a/setuptools/command/egg_info.py
+++ b/setuptools/command/egg_info.py
@@ -565,6 +565,7 @@ class manifest_maker(sdist):
         if os.path.exists(self.template):
             self.read_template()
         self.add_license_files()
+        self._add_referenced_files()
         self.prune_file_list()
         self.filelist.sort()
         self.filelist.remove_duplicates()
@@ -622,6 +623,12 @@ class manifest_maker(sdist):
             pass
         self.filelist.extend(license_files)
 
+    def _add_referenced_files(self):
+        """Add files referenced by the config (e.g. `file:` directive) to filelist"""
+        referenced = getattr(self.distribution, '_referenced_files', [])
+        # ^-- fallback if dist comes from distutils or is a custom class
+        self.filelist.extend(referenced)
+
     def prune_file_list(self):
         build = self.get_finalized_command('build')
         base_dir = self.distribution.get_fullname()
diff --git a/setuptools/config/setupcfg.py b/setuptools/config/setupcfg.py
index c2a974de..3df3b6e7 100644
--- a/setuptools/config/setupcfg.py
+++ b/setuptools/config/setupcfg.py
@@ -12,7 +12,7 @@ from collections import defaultdict
 from functools import partial
 from functools import wraps
 from typing import (TYPE_CHECKING, Callable, Any, Dict, Generic, Iterable, List,
-                    Optional, Tuple, TypeVar, Union)
+                    Optional, Set, Tuple, TypeVar, Union)
 
 from distutils.errors import DistutilsOptionError, DistutilsFileError
 from setuptools.extern.packaging.requirements import Requirement, InvalidRequirement
@@ -172,6 +172,9 @@ def parse_configuration(
             distribution.src_root,
         )
         meta.parse()
+        distribution._referenced_files.update(
+            options._referenced_files, meta._referenced_files
+        )
 
     return meta, options
 
@@ -247,6 +250,10 @@ class ConfigHandler(Generic[Target]):
         self.sections = sections
         self.set_options: List[str] = []
         self.ensure_discovered = ensure_discovered
+        self._referenced_files: Set[str] = set()
+        """After parsing configurations, this property will enumerate
+        all files referenced by the "file:" directive. Private API for setuptools only.
+        """
 
     @property
     def parsers(self):
@@ -365,8 +372,7 @@ class ConfigHandler(Generic[Target]):
 
         return parser
 
-    @classmethod
-    def _parse_file(cls, value, root_dir: _Path):
+    def _parse_file(self, value, root_dir: _Path):
         """Represents value as a string, allowing including text
         from nearest files using `file:` directive.
 
@@ -388,7 +394,8 @@ class ConfigHandler(Generic[Target]):
             return value
 
         spec = value[len(include_directive) :]
-        filepaths = (path.strip() for path in spec.split(','))
+        filepaths = [path.strip() for path in spec.split(',')]
+        self._referenced_files.update(filepaths)
         return expand.read_files(filepaths, root_dir)
 
     def _parse_attr(self, value, package_dir, root_dir: _Path):
diff --git a/setuptools/dist.py b/setuptools/dist.py
index 1c71e5ee..cd34d74a 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -17,7 +17,7 @@ from distutils.fancy_getopt import translate_longopt
 from glob import iglob
 import itertools
 import textwrap
-from typing import List, Optional, TYPE_CHECKING
+from typing import List, Optional, Set, TYPE_CHECKING
 from pathlib import Path
 
 from collections import defaultdict
@@ -481,6 +481,11 @@ class Distribution(_Distribution):
             },
         )
 
+        # Private API (setuptools-use only, not restricted to Distribution)
+        # Stores files that are referenced by the configuration and need to be in the
+        # sdist (e.g. `version = file: VERSION.txt`)
+        self._referenced_files: Set[str] = set()
+
         # Save the original dependencies before they are processed into the egg format
         self._orig_extras_require = {}
         self._orig_install_requires = []