add py3.5 netifaces

lib/python3.4/site-packages/pip/commands/install.py

@@ -24,6 +24,7 @@ from pip.utils.deprecation import RemovedInPip10Warning
 from pip.utils.filesystem import check_path_owner
 from pip.wheel import WheelCache, WheelBuilder
 
+from pip.locations import running_under_virtualenv
 
 logger = logging.getLogger(__name__)
 
@@ -54,6 +55,12 @@ class InstallCommand(RequirementCommand):
     def __init__(self, *args, **kw):
         super(InstallCommand, self).__init__(*args, **kw)
 
+        default_user = True
+        if running_under_virtualenv():
+            default_user = False
+        if os.geteuid() == 0:
+            default_user = False
+
         cmd_opts = self.cmd_opts
 
         cmd_opts.add_option(cmdoptions.constraints())
@@ -103,6 +110,7 @@ class InstallCommand(RequirementCommand):
             '-I', '--ignore-installed',
             dest='ignore_installed',
             action='store_true',
+            default=default_user,
             help='Ignore the installed packages (reinstalling instead).')
 
         cmd_opts.add_option(cmdoptions.no_deps())
@@ -114,10 +122,20 @@ class InstallCommand(RequirementCommand):
             '--user',
             dest='use_user_site',
             action='store_true',
+            default=default_user,
             help="Install to the Python user install directory for your "
                  "platform. Typically ~/.local/, or %APPDATA%\Python on "
                  "Windows. (See the Python documentation for site.USER_BASE "
-                 "for full details.)")
+                 "for full details.)  On Debian systems, this is the "
+                 "default when running outside of a virtual environment "
+                 "and not as root.")
+
+        cmd_opts.add_option(
+            '--system',
+            dest='use_user_site',
+            action='store_false',
+            help="Install using the system scheme (overrides --user on "
+                 "Debian systems)")
 
         cmd_opts.add_option(
             '--egg',