Make the Python module pip-installable

src/python/Makefile.am

@@ -2,6 +2,7 @@ include $(top_srcdir)/Makefile.defs
 
 PYTHON_BUILD_ARGS := --plat-name=$(shell $(srcdir)/crosscompileargs)
 PYTHON_SETUP_PY = env \
+	BUILD_MODULE=y \
 	SSO_LIB_DIR=$(top_builddir)/src/sso/.libs \
 	SRCDIR=$(srcdir) BUILDDIR=$(builddir) \
 	$(PYTHON) setup.py

src/python/setup.py

@@ -7,11 +7,21 @@ BUILDDIR = os.getenv('BUILDDIR', SRCDIR)
 SSO_LIB_DIR = os.getenv('SSO_LIB_DIR', '.')
 libsso_srcdir = os.path.join(SRCDIR, '..')
 
-setup(name='libsso',
-      ext_modules=[Extension('sso._sso_c', ['sso/sso.i'],
+# If BUILD_MODULE is not defined, bundle libsso into the Python
+# extension so that this package is pip-installable directly.
+ext_sources = ['sso/sso.i']
+libraries = ['sso']
+if not os.getenv('BUILD_MODULE'):
+    ext_sources.extend(os.path.join(libsso_srcdir, 'sso', x) for x in [
+        'base64.c', 'randombytes.c', 'sso.c', 'tweetnacl.c',
+    ])
+    libraries = []
+
+setup(name='sso',
+      ext_modules=[Extension('sso._sso_c', ext_sources,
                              swig_opts=['-c++', '-modern', '-I' + libsso_srcdir],
                              include_dirs=[libsso_srcdir],
-                             libraries=['sso'],
+                             libraries=libraries,
                              library_dirs=[SSO_LIB_DIR],
                             )],
       package_dir={'sso': 'sso'},