Add Ubuntu 18.04 LTS (Bionic) Support

* Adds patch for Postgres 10 https://stackoverflow.com/a/51373732/387558
* Adds Cosmic repo for pdftk-java https://askubuntu.com/a/1028983

Vagrantfile

@@ -116,6 +116,10 @@ SUPPORTED_OPERATING_SYSTEMS = {
     box: 'ubuntu/xenial64',
     box_url: 'https://app.vagrantup.com/ubuntu/boxes/xenial64'
   },
+  'bionic64' => {
+    box: 'ubuntu/bionic64',
+    box_url: 'https://app.vagrantup.com/ubuntu/boxes/bionic64'
+  },
   'stretch64' => {
     box: 'debian/stretch64',
     box_url: 'https://app.vagrantup.com/debian/boxes/stretch64'

config/initializers/backport_pg_10_support_to_rails_4.rb

@@ -0,0 +1,45 @@
+require 'active_record/connection_adapters/postgresql/schema_statements'
+
+#
+# Monkey-patch the refused Rails 4.2 patch at https://github.com/rails/rails/pull    /31330
+#
+# Updates sequence logic to support PostgreSQL 10.
+#
+
+module ActiveRecord
+  module ConnectionAdapters
+    module PostgreSQL
+      module SchemaStatements
+        # Resets the sequence of a table's primary key to the maximum value.
+        def reset_pk_sequence!(table, pk = nil, sequence = nil) #:nodoc:
+          unless pk and sequence
+            default_pk, default_sequence = pk_and_sequence_for(table)
+
+            pk ||= default_pk
+            sequence ||= default_sequence
+          end
+
+          if @logger && pk && !sequence
+            @logger.warn "#{table} has primary key #{pk} with no default sequence"
+          end
+
+          if pk && sequence
+            quoted_sequence = quote_table_name(sequence)
+            max_pk = select_value("SELECT MAX(#{quote_column_name pk}) FROM #{quote_table_name(table)}")
+            if max_pk.nil?
+              if postgresql_version >= 100000
+                minvalue = select_value("SELECT seqmin FROM pg_sequence WHERE seqrelid = #{quote(quoted_sequence)}::regclass")
+              else
+                minvalue = select_value("SELECT min_value FROM #{quoted_sequence}")
+              end
+            end
+
+            select_value <<-end_sql, 'SCHEMA'
+              SELECT setval(#{quote(quoted_sequence)}, #{max_pk ? max_pk : minvalue}, #{max_pk ? true : false})
+            end_sql
+          end
+        end
+      end
+    end
+  end
+end

config/packages.ubuntu-bionic

@@ -0,0 +1,37 @@
+build-essential
+bundler
+catdoc
+elinks
+geoip-database
+gettext
+ghostscript
+gnuplot-nox
+imagemagick
+libicu-dev
+libmagic-dev
+libmagickwand-dev
+libpq-dev
+libsqlite3-dev
+libxml2-dev
+libxslt-dev
+links
+lockfile-progs
+memcached
+mutt
+pdftk-java
+poppler-utils
+postgresql
+postgresql-client
+python-yaml
+rake
+ruby
+ruby-dev
+sqlite3
+tnef
+ttf-bitstream-vera
+unrtf
+unzip
+uuid-dev
+wkhtmltopdf-static
+wv
+xapian-tools

script/site-specific-install.sh

@@ -76,6 +76,26 @@ fi
 
 update_mysociety_apt_sources
 
+# Ubuntu Bionic Fixes
+if [ x"$DISTRIBUTION" = x"ubuntu" ] && [ x"$DISTVERSION" = x"bionic" ]
+then
+  # Add cosmic repo to get pdftk-java
+  cat > /etc/apt/sources.list.d/ubuntu-cosmic.list <<EOF
+deb http://archive.ubuntu.com/ubuntu/ cosmic universe
+deb-src http://archive.ubuntu.com/ubuntu/ cosmic universe
+EOF
+
+  # De-prioritise all packages from cosmic. We only add the repo to install
+  # pdftk-java, as pdftk is not available in bionic.
+  cat >> /etc/apt/preferences <<EOF
+Package: *
+Pin: release n=cosmic
+Pin-Priority: 50
+EOF
+
+  apt-get -qq update
+fi
+
 apt-get -y update
 
 echo 'Setting hostname...'