update installation docs

Author: furlongm

INSTALL.md

@@ -57,17 +57,14 @@ patchman-manage createsuperuser
 
 ### virtualenv + pip
 
-TBD - not working yet
-
 ```shell
-apt -y install gcc libxml2-dev libxslt1-dev virtualenv python3-dev zlib1g-dev  # (debian/ubuntu)
-dnf -y install gcc libxml2-devel libxslt-devel python3-virtualenv              # (rocky/alma/redhat)
+apt -y install python3-venv        # (debian/ubuntu)
+dnf -y install python3-virtualenv  # (rocky/alma/redhat)
 mkdir /srv/patchman
 cd /srv/patchman
 python3 -m venv .venv
 . .venv/bin/activate
-pip install --upgrade pip
-pip install patchman gunicorn whitenoise==3.3.1
+pip install patchman gunicorn whitenoise
 patchman-manage migrate
 patchman-manage createsuperuser
 gunicorn patchman.wsgi -b 0.0.0.0:80

patchman/settings.py

@@ -148,12 +148,12 @@
     # if sys.prefix + conf_path doesn't exist, try ./etc/patchman (source)
     if not os.path.isdir(conf_path):
         conf_path = './etc/patchman'
-    # if ./etc/patchman doesn't exist, try site.getsitepackages() (pip)
+    # if ./etc/patchman doesn't exist, try site.getsitepackages() (pip/new-style virtualenv)
     if not os.path.isdir(conf_path):
         try:
-            sitepackages = site.getsitepackages()
-        except AttributeError:
-            # virtualenv, try site-packages in sys.path
+            sitepackages = site.getsitepackages()[0]
+        except (AttributeError, IndexError):
+            # old-style virtualenv, try site-packages in sys.path
             sp = 'site-packages'
             sitepackages = [s for s in sys.path if s.endswith(sp)][0]
         conf_path = os.path.join(sitepackages, 'etc/patchman')