Check that the tahoelafs home directory gets created

src/freedombone-app-tahoelafs

 
     # create a user
     adduser --disabled-login --gecos 'tahoe-lafs' tahoelafs
+
+    if [ ! -d /home/tahoelafs ]; then
+        echo $'/home/tahoelafs directory was not created'
+        exit 879335
+    fi
+
     adduser tahoelafs debian-tor
     groupadd tahoelafs