Bundle the build dependencies to re-enable source builds. Fixes #980.

.gitignore

@@ -13,4 +13,4 @@ setuptools.egg-info
 *.swp
 *~
 .hg*
-requirements.txt
+build-deps.txt

CHANGES.rst

@@ -1,3 +1,9 @@
+v34.3.0
+-------
+
+* #980: Re-enable building of setuptools from source by
+  bundling its build dependencies.
+
 v34.2.0
 -------
 

MANIFEST.in

@@ -12,3 +12,4 @@ include launcher.c
 include msvc-build-launcher.cmd
 include pytest.ini
 include tox.ini
+include build-deps.zip

bootstrap.py

@@ -89,16 +89,20 @@ def install_deps():
         shutil.rmtree(tmpdir)
 
 
+def bundle_deps():
+    """
+    Generate 'build-deps.zip'
+    """
+    gen_deps()
+    with install_deps() as dir:
+        shutil.make_archive('build-deps', 'zip', dir)
+    os.remove('requirements.txt')
+
+
 def main():
+    bundle_deps()
     ensure_egg_info()
-    gen_deps()
-    try:
-        # first assume dependencies are present
-        run_egg_info()
-    except Exception:
-        # but if that fails, try again with dependencies just in time
-        with install_deps():
-            run_egg_info()
+    run_egg_info()
 
 
 __name__ == '__main__' and main()

setup.py

@@ -8,9 +8,10 @@
 import sys
 import textwrap
 
-import setuptools
-
 here = os.path.dirname(__file__)
+sys.path.append(os.path.abspath(os.path.join(here, 'build-deps.zip')))
+
+import setuptools
 
 
 def require_metadata():

tox.ini

@@ -1,7 +1,6 @@
 [testenv]
 deps=
     -rtests/requirements.txt
-    -rrequirements.txt
 passenv=APPDATA USERPROFILE HOMEDRIVE HOMEPATH windir APPVEYOR
 commands=py.test {posargs:-rsx}
 usedevelop=True