Detect virtualenv

Author: wil93

cms/conf.py

@@ -123,10 +123,12 @@ def __init__(self):
         self.pdf_printing_allowed = False
 
         # Installed or from source?
-        self.installed = sys.argv[0].startswith("/usr/") and \
-            sys.argv[0] != '/usr/bin/ipython' and \
-            sys.argv[0] != '/usr/bin/python2' and \
-            sys.argv[0] != '/usr/bin/python'
+        self.installed = (sys.argv[0].startswith("/usr/") and
+            sys.argv[0] != '/usr/bin/ipython' and
+            sys.argv[0] != '/usr/bin/python2' and
+            sys.argv[0] != '/usr/bin/python')
+        # Test for virtualenv (see http://stackoverflow.com/a/1883251/747654)
+        self.installed |= hasattr(sys, 'real_prefix')
 
         if self.installed:
             self.log_dir = os.path.join("/", "var", "local", "log", "cms")

cmsranking/Config.py

@@ -63,10 +63,12 @@ def __init__(self):
         self.buffer_size = 100  # Needs to be strictly positive.
 
         # File system.
-        self.installed = sys.argv[0].startswith("/usr/") and \
-            sys.argv[0] != '/usr/bin/ipython' and \
-            sys.argv[0] != '/usr/bin/python2' and \
-            sys.argv[0] != '/usr/bin/python'
+        self.installed = (sys.argv[0].startswith("/usr/") and
+            sys.argv[0] != '/usr/bin/ipython' and
+            sys.argv[0] != '/usr/bin/python2' and
+            sys.argv[0] != '/usr/bin/python')
+        # Test for virtualenv (see http://stackoverflow.com/a/1883251/747654)
+        self.installed |= hasattr(sys, 'real_prefix')
 
         self.web_dir = pkg_resources.resource_filename("cmsranking", "static")
         if self.installed:

docs/Installation.rst

@@ -161,8 +161,6 @@ Method 2: Virtual environment
 
 .. warning::
 
-   At the moment, CMS does not work correctly when installed in a virtual environment. You can use virtual enviroment to run CMS non-installed. See :ref:`the instructions <installation_running-cms-non-installed>` on how to run CMS without installing it.
-
 An alternative method to perform the installation is with a `virtual environment <https://virtualenv.pypa.io/en/latest/>`_, which is an isolated Python environment that you can put wherever you like and that can be activated/deactivated at will. The tool you need in order to create a virtual environment is called ``virtualenv``, and can be installed by looking for ``virtualenv`` using your Linux distribution's package manager. For example:
 
 * Ubuntu 14.x: `python-virtualenv <http://packages.ubuntu.com/trusty/python-virtualenv>`_.