Fixes #153: Use "distutils.sysconfig.get_python_lib()" when "site.get…

…sitepackages()" is unavailable (#154)

lib/getsitepackages.py

@@ -0,0 +1,12 @@
+import site
+
+if hasattr(site, 'getsitepackages'):
+    print site.getsitepackages()
+else:
+    # If "site" module has no "getsitepackages" function then most probably Python is running inside of "virtualenv".
+    # - https://github.com/pypa/virtualenv/issues/355
+    # - https://github.com/SFTtech/openage/pull/1031
+    # - https://github.com/dmlc/tensorboard/issues/38#issuecomment-343017735
+    from distutils.sysconfig import get_python_lib
+
+    print [get_python_lib()]

lib/variables.py

@@ -17,6 +17,12 @@
         )
     )
 
+dirs = {
+    'lib': os.path.realpath(__file__ + '/..'),
+    'self': os.path.realpath(__file__ + '/../..'),
+    'project': os.environ.get('CIKIT_PROJECT_DIR'),
+}
+
 # It's an interesting trick for detecting Python interpreter. Sometimes it
 # may differ. Especially on MacOS, when Ansible installed via Homebrew. For
 # instance, "which python" returns the "/usr/local/Cellar/python/2.7.13/
@@ -40,7 +46,7 @@
     if PYTHON_SYSTEM != PYTHON_ANSIBLE:
         import ast
 
-        for site_packages in ast.literal_eval(functions.call(PYTHON_ANSIBLE, '-c', 'import site; print(site.getsitepackages())')):
+        for site_packages in ast.literal_eval(functions.call(PYTHON_ANSIBLE, dirs['lib'] + '/getsitepackages.py')):
             if site_packages not in sys.path:
                 sys.path.append(site_packages)
 
@@ -67,12 +73,6 @@
     ],
 })
 
-dirs = {
-    'lib': os.path.realpath(__file__ + '/..'),
-    'self': os.path.realpath(__file__ + '/../..'),
-    'project': os.environ.get('CIKIT_PROJECT_DIR'),
-}
-
 if None is dirs['project']:
     dirs['project'] = os.getcwd()
     dirs['scripts'] = dirs['self']