Adding python3 support and gutenprint packages

Dockerfile

@@ -8,17 +8,21 @@ RUN echo "http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositorie
 	cups-client \
 	cups-filters \
 	cups-dev \
+	gutenprint \
+	gutenprint-libs \
+	gutenprint-doc \
+	gutenprint-cups \
 	ghostscript \
 	avahi \
 	inotify-tools \
-	python \
-	python-dev \
-	py-pip \
+	python3 \
+	python3-dev \
+	py3-pip \
 	build-base \
 	wget \
 	rsync \
-	&& pip --no-cache-dir install --upgrade pip \
-	&& pip install pycups \
+	&& pip3 --no-cache-dir install --upgrade pip \
+	&& pip3 install pycups \
 	&& rm -rf /var/cache/apk/*
 
 # This will use port 631

root/root/airprint-generate.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Copyright (c) 2010 Timothy J Fontaine <tjfontaine@atxconsulting.com>
@@ -22,9 +22,10 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
 
-import cups, os, optparse, re, urlparse
+import cups, os, optparse, re
+import urllib.parse as urlparse
 import os.path
-from StringIO import StringIO
+from io import StringIO
 
 from xml.dom.minidom import parseString
 from xml.dom import minidom
@@ -43,7 +44,8 @@ except:
             from elementtree import Element, ElementTree, tostring
             etree = None
         except:
-            raise 'Failed to find python libxml or elementtree, please install one of those or use python >= 2.5'
+            print('Failed to find python libxml or elementtree, please install one of those or use python >= 2.5')
+            raise
 
 XML_TEMPLATE = """<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
 <service-group>
@@ -121,7 +123,7 @@ class AirPrintGenerate(object):
             
         printers = conn.getPrinters()
         
-        for p, v in printers.items():
+        for p, v in list(printers.items()):
             if v['printer-is-shared']:
                 attrs = conn.getPrinterAttributes(p)
                 uri = urlparse.urlparse(v['printer-uri-supported'])

root/root/run_cups.sh

@@ -2,6 +2,16 @@
 set -e
 set -x
 
+# Is CUPSADMIN set? If not, set to default
+if [ -z "$CUPSADMIN" ]; then
+    CUPSADMIN="cupsadmin"
+fi
+
+# Is CUPSPASSWORD set? If not, set to $CUPSADMIN
+if [ -z "$CUPSPASSWORD" ]; then
+    CUPSPASSWORD=$CUPSADMIN
+fi
+
 if [ $(grep -ci $CUPSADMIN /etc/shadow) -eq 0 ]; then
     adduser -S -G lpadmin --no-create-home $CUPSADMIN 
 fi