Make pkg_resources an optional module dependency

README.rst

@@ -23,9 +23,11 @@ Python
 
 - Python_ 2.6 or above is required. Python_ 3.x is not yet supported.
 - Netifaces_ Python module
+- Optional: python-pkg-resources_ Python module
 
 .. _Python: http://python.org/
 .. _Netifaces: http://alastairs-place.net/netifaces/
+.. _python-pkg-resources: http://pythonhosted.org/distribute/pkg_resources.html
 
 Permissions
 -----------

pybootd/__init__.py

@@ -21,7 +21,11 @@ import os
 import sys
 
 def _get_package_name(default='', version='1.5.0'):
+    try:
         from pkg_resources import WorkingSet
+    except ImportError:
+        ws = []
+    else:
         ws = WorkingSet()
     _path, _ = os.path.split(os.path.dirname( \
                                     sys.modules['pybootd'].__file__))
@@ -48,9 +52,12 @@ def pybootd_path(path):
     else:
         try:
             from pkg_resources import Requirement, resource_filename
+            from pkg_resources import get_distribution
+        except ImportError:
+            raise IOError('pkg_resources module not available')
+        try:
             newpath = resource_filename(Requirement.parse(PRODUCT_NAME), path)
             if not newpath:
-                from pkg_resources import get_distribution
                 localpath = get_distribution(PRODUCT_NAME).location
                 newpath = os.path.join(localpath, path)
         except KeyError:

setup.py

@@ -36,7 +36,7 @@ setup(
     url='http://github.com/eblot/pybootd',
     download_url='https://github.com/eblot/pybootd/tarball/master',
     packages=['pybootd'],
-    requires=['netifaces (>= 0.5)'],
+    # requires=['netifaces (>= 0.5)'],
     classifiers=[
         'Development Status :: 4 - Beta',
         'Environment :: No Input/Output (Daemon)',