set setup.py install_requires properly

Let's enable pip to solve the dependency.

The code is taken from OpenStack.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/utils.py

@@ -19,6 +19,7 @@ import inspect
 import logging
 import os
 import sys
+import re
 
 LOG = logging.getLogger('ryu.utils')
 
@@ -69,3 +70,43 @@ def round_up(x, y):
 
 def hex_array(data):
     return ' '.join(hex(ord(chr)) for chr in data)
+
+
+# the following functions are taken from OpenStack
+#
+# Get requirements from the first file that exists
+def get_reqs_from_files(requirements_files):
+    for requirements_file in requirements_files:
+        if os.path.exists(requirements_file):
+            with open(requirements_file, 'r') as fil:
+                return fil.read().split('\n')
+    return []
+
+
+def parse_requirements(requirements_files=['requirements.txt',
+                                           'tools/pip-requires']):
+    requirements = []
+    for line in get_reqs_from_files(requirements_files):
+        # For the requirements list, we need to inject only the portion
+        # after egg= so that distutils knows the package it's looking for
+        # such as:
+        # -e git://github.com/openstack/nova/master#egg=nova
+        if re.match(r'\s*-e\s+', line):
+            requirements.append(re.sub(r'\s*-e\s+.*#egg=(.*)$', r'\1',
+                                line))
+        # such as:
+        # http://github.com/openstack/nova/zipball/master#egg=nova
+        elif re.match(r'\s*https?:', line):
+            requirements.append(re.sub(r'\s*https?:.*#egg=(.*)$', r'\1',
+                                line))
+        # -f lines are for index locations, and don't get used here
+        elif re.match(r'\s*-f\s+', line):
+            pass
+        # argparse is part of the standard library starting with 2.7
+        # adding it to the requirements list screws distro installs
+        elif line == 'argparse' and sys.version_info >= (2, 7):
+            pass
+        else:
+            requirements.append(line)
+
+    return requirements

setup.py

@@ -21,6 +21,9 @@ from setuptools import find_packages
 from setuptools import setup
 
 from ryu import version
+from ryu import utils
+
+requires = utils.parse_requirements()
 
 doing_bdist = any(arg.startswith('bdist') for arg in sys.argv[1:])
 
@@ -53,6 +56,7 @@ setup(name='ryu',
       url='http://osrg.github.com/ryu/',
       author='Ryu project team',
       author_email='ryu-devel@lists.sourceforge.net',
+      install_requires=requires,
       license='Apache License 2.0',
       packages=find_packages(),
       scripts=['bin/ryu-manager',