Updated formula: mongodb - Added configuration file, changing data dir to #{var}/mongodb, and adding launchd plist file.

Formula/mongodb.rb

@@ -4,6 +4,8 @@ require 'hardware'
 class Mongodb <Formula
   homepage 'http://www.mongodb.org/'
 
+  aka :mongo
+
   if Hardware.is_64_bit? and not ARGV.include? '--32bit'
     url 'http://downloads.mongodb.org/osx/mongodb-osx-x86_64-1.2.0.tgz'
     md5 'e2d6f7b7f1c0ab71fd629c015ced033c'
@@ -19,6 +21,66 @@ class Mongodb <Formula
   end
 
   def install
+    # Copy the prebuilt binaries to prefix
     system "cp -prv * #{prefix}"
+
+    # Create the data and log directories under /var
+    (var+'mongodb').mkpath
+    (var+'log/mongodb').mkpath
+
+    # Write the configuration files and launchd script
+    (prefix+'mongod.conf').write mongodb_conf
+    (prefix+'org.mongodb.mongod.plist').write startup_plist
+  end
+
+  def caveats; <<-EOS
+You can enable mongodb to automatically load on login with:
+    launchctl load -w #{prefix}/org.mongodb.mongod.plist
+
+Or start it manually:
+    #{bin}/mongod run --config #{prefix}/mongod.conf
+EOS
+  end
+
+  def mongodb_conf
+    return <<-EOS
+# Store data in #{var}/mongodb instead of the default /data/db
+dbpath = #{var}/mongodb
+
+# Only accept local connections
+bind_ip = 127.0.0.1
+EOS
+  end
+
+  def startup_plist
+    return <<-EOS
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>Label</key>
+  <string>org.mongodb.mongod</string>
+  <key>ProgramArguments</key>
+  <array>
+    <string>#{bin}/mongod</string>
+    <string>run</string>
+    <string>--config</string>
+    <string>#{prefix}/mongod.conf</string>
+  </array>
+  <key>RunAtLoad</key>
+  <true/>
+  <key>KeepAlive</key>
+  <true/>
+  <key>UserName</key>
+  <string>#{`whoami`}</string>
+  <key>WorkingDirectory</key>
+  <string>#{HOMEBREW_PREFIX}</string>
+  <key>StandardErrorPath</key>
+  <string>#{var}/log/mongodb/output.log</string>
+  <key>StandardOutPath</key>
+  <string>#{var}/log/mongodb/output.log</string>
+</dict>
+</plist>
+EOS
   end
 end