Ubuntu install script

Summary:
Simple script to install dependencies on Ubuntu.

There's probably lots of room for improvement here.

Test Plan:
Imaged a clean Ubuntu box in EC2 and ran this script, it appeared to work?

Reviewed By: tuomaspelkonen
Reviewers: kevinwallace, jungejason, tuomaspelkonen, aran
Commenters: aran
CC: moskov, aran, tuomaspelkonen, epriestley
Differential Revision: 384

scripts/install/install_ubuntu.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+confirm() {
+  echo "Press RETURN to continue, or ^C to cancel.";
+  read -e ignored
+}
+
+ISSUE=`cat /etc/issue`
+if [[ $ISSUE != Ubuntu* ]]
+then
+  echo "This script is intended for use on Ubuntu, but this system appears";
+  echo "to be something else. Your results may vary.";
+  echo
+  confirm
+fi
+
+echo "PHABRICATOR UBUNTU INSTALL SCRIPT";
+echo "This script will install Phabricator and all of its core dependencies.";
+echo "Run it from the directory you want to install into.";
+echo
+
+ROOT=`pwd`
+echo "Phabricator will be installed to: ${ROOT}.";
+confirm
+
+echo "Testing sudo..."
+sudo true
+if [ $? -ne 0 ]
+then
+  echo "ERROR: You must be able to sudo to run this script.";
+  exit 1;
+fi;
+
+echo "Installing dependencies: git, apache, mysql, php...";
+echo
+
+set +x
+
+sudo apt-get -qq update
+sudo apt-get install git mysql-server apache2 php5 php5-mysql php5-gd php5-dev php-apc dpkg-dev
+
+HAVEPCNTL=`php -r "echo extension_loaded('pcntl');"`
+if [ $HAVEPCNTL != "1" ]
+then
+  echo "Installing pcntl...";
+  echo
+  apt-get source php5
+  PHP5=`ls -1F | grep '^php5-.*/$'`
+  (cd $PHP5/ext/pcntl && phpize && ./configure && make && sudo make install)
+else
+  echo "pcntl already installed";
+fi
+
+if [ ! -e libphutil ]
+then
+  git clone git://github.com/facebook/libphutil.git
+else
+  (cd libphutil && git pull --rebase)
+fi
+
+if [ ! -e arcanist ]
+then
+  git clone git://github.com/facebook/arcanist.git
+else
+  (cd arcanist && git pull --rebase)
+fi
+
+if [ ! -e phabricator ]
+then
+  git clone git://github.com/facebook/phabricator.git
+else
+  (cd phabricator && git pull --rebase)
+fi
+
+(cd phabricator && git submodule update --init)
+
+echo
+echo
+echo "Install probably worked mostly correctly. Continue with the 'Configuration Guide':";
+echo
+echo "    http://phabricator.com/docs/phabricator/article/Configuration_Guide.html";
+echo
+echo "You can delete any php5-* stuff that's left over in this directory if you want.";