From 930f20f3c28f8ebf24323bf58a179cd6bac3be17 Mon Sep 17 00:00:00 2001
From: Deniz Taneli <7292227+dtaneli@users.noreply.github.com>
Date: Sat, 27 Oct 2018 13:19:22 +0100
Subject: [PATCH] Setuptools will install licenses if included in setup.cfg

Addressing #357

`python setup.py sdist` now includes the license file if `license_file`
is included in `setup.cfg` unless it is explicitly excluded in `MANIFEST.in`.

Co-Authored-By: Poyzan Nur Taneli <31743851+ptaneli@users.noreply.github.com>
---
 setuptools/command/egg_info.py |  1 +
 setuptools/command/sdist.py    | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/setuptools/command/egg_info.py b/setuptools/command/egg_info.py
index bd116e1f6cc..93100ab946d 100644
--- a/setuptools/command/egg_info.py
+++ b/setuptools/command/egg_info.py
@@ -568,6 +568,7 @@ def _should_suppress_warning(msg):
 
     def add_defaults(self):
         sdist.add_defaults(self)
+        self.check_license()
         self.filelist.append(self.template)
         self.filelist.append(self.manifest)
         rcfiles = list(walk_revctrl())
diff --git a/setuptools/command/sdist.py b/setuptools/command/sdist.py
index bcfae4d82f6..6820be9d603 100644
--- a/setuptools/command/sdist.py
+++ b/setuptools/command/sdist.py
@@ -198,3 +198,28 @@ def read_manifest(self):
                 continue
             self.filelist.append(line)
         manifest.close()
+
+    def check_license(self):
+        """Read the setup configuration file ('setup.cfg') and use it to find
+        if a license is defined with the 'license_file' attribute.
+        If the license is declared and exists, it will be added to
+        'self.filelist'.
+        """
+
+        from configparser import ConfigParser
+        cfg_file = 'setup.cfg'
+        log.debug("Reading configuration from %s", cfg_file)
+        parser = ConfigParser()
+        parser.read(cfg_file)
+        license_file = parser.get('metadata', 'license_file', fallback=None)
+
+        if not license_file:
+            log.debug("license_file attribute is not defined in setup.cfg")
+            return
+
+        if not os.path.exists(license_file):
+            log.warn("warning: Failed to find license file '%s' in setup.cfg",
+                     license_file)
+            return
+
+        self.filelist.append(license_file)