Add nasty Ubiquity hacks to force username, set password

Username is fixed, but password can still be changed.
Also forces encryption off, since it won't work with an existing
/home dir.

preseed.cfg

@@ -1,16 +1,30 @@
 # Commands to run at casper boot:
 # - Regenerate SSH keys
 # - Append /etc/hosts.nilm to /etc/hosts
+#
+# And the following hacks, which could also run in customize-inner.sh,
+# but doing them here ensures that they'll only be present during the
+# LiveCD session
 # - Append some stuff to /etc/enviroment that's needed for Ubiquity to
 #   create the initial user properly, when we've already created it.
+# - Hack Ubiquity to prevent changing the username, and to set
+#   a default password
 d-i preseed/early_command string \
     echo "early_command running" ; \
     chroot /root sh -c "rm -f /etc/ssh/ssh_host_*" ; \
     chroot /root sh -c "dpkg-reconfigure openssh-server" ; \
-    chroot /root sh -c "cat /etc/hosts.nilm >> /etc/hosts" ; \
-    chroot /root sh -c "echo OVERRIDE_SYSTEM_USER=1 >> /etc/environment" ; \
-    chroot /root sh -c "echo UBIQUITY_AUTOMATIC=1 >> /etc/environment" ; \
+    cat /root/etc/hosts.nilm >> /root/etc/hosts ; \
+    echo OVERRIDE_SYSTEM_USER=1 >> /root/etc/environment ; \
+    sed -i \
+        -e 's@id="login_encrypt">@id="login_encrypt"><property name="sensitive">False</property>@g' \
+        -e 's@id="fullname">@id="fullname"><property name="sensitive">False</property>@g' \
+        -e 's@id="username">@id="username"><property name="sensitive">False</property>@g' \
+        -e 's@"visibility">False@"visibility">True@g' \
+        -e 's@id="password">@id="password"><property name="text">nilm</property>@g' \
+        -e 's@id="verified_password">@id="verified_password"><property name="text">nilm</property>@g' \
+        /root/usr/share/ubiquity/gtk/stepUserInfo.ui ; \
     echo "early_command done"
+#    chroot /root sh -c "echo UBIQUITY_AUTOMATIC=1 >> /etc/environment"
 
 # Commands to run on successful install:
 #   (Ubiquity doesn't actually use preseed/late_command, so we do it
@@ -27,15 +41,14 @@ ubiquity ubiquity/success_command string \
     echo "success_command done" >>/target/var/log/installer/postinst.log
 
 ubiquity ubiquity/use_nonfree boolean true
-ubiquity ubiquity/use_nonfree seen false
 
 # Default user.  Ubiquity should let them change this.
 # (To skip the dialog completely, set the first 4, and put
 # UBIQUITY_AUTOMATIC in /etc/environment in early_command above)
 d-i passwd/user-fullname string NILM User
 d-i passwd/username string nilm
-d-i passwd/user-password password nilm
-d-i passwd/user-password-again password nilm
+#d-i passwd/user-password password nilm
+#d-i passwd/user-password-again password nilm
 d-i user-setup/allow-password-weak boolean true
 d-i user-setup/force-encrypt-home boolean false
 d-i user-setup/encrypt-home boolean false