graylog2-server: add launchd plist

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/graylog2-server.rb

@@ -22,24 +22,74 @@ class Graylog2Server < Formula
 
     etc.install "graylog2.conf"
     prefix.install Dir['*']
+
+    plist_path.write startup_plist
+    plist_path.chmod 0644
   end
 
   def caveats
     <<-EOS.undent
-      In the interest of allowing you to run `graylog2ctl`
-      without `sudo`, the default port is set to 8514.
+      In the interest of allowing you to run graylog2-server as a
+      non-root user, the default syslog_listen_port is set to 8514.
 
-      To start graylog2-server:
-        graylog2ctl start
+      If this is your first install, automatically load on login with:
+          mkdir -p ~/Library/LaunchAgents
+          cp #{plist_path} ~/Library/LaunchAgents/
+          launchctl load -w ~/Library/LaunchAgents/#{plist_path.basename}
 
-      To stop graylog2-server:
-        graylog2ctl stop
+      If this is an upgrade and you already have the #{plist_path.basename} loaded:
+          launchctl unload -w ~/Library/LaunchAgents/#{plist_path.basename}
+          cp #{plist_path} ~/Library/LaunchAgents/
+          launchctl load -w ~/Library/LaunchAgents/#{plist_path.basename}
 
-      The config file is located at:
-        #{etc}/graylog2.conf
+      Or to manage graylog2-server without launchd:
+
+        To start graylog2-server:
+          graylog2ctl start
+
+        To stop graylog2-server:
+          graylog2ctl stop
+
+        The config file is located at:
+          #{etc}/graylog2.conf
     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>#{plist_name}</string>
+  <key>ProgramArguments</key>
+  <array>
+    <string>java</string>
+    <string>-jar</string>
+    <string>#{prefix}/graylog2-server.jar</string>
+    <string>-f</string>
+    <string>#{etc}/graylog2.conf</string>
+    <string>-p</string>
+    <string>/tmp/graylog2.pid</string>
+  </array>
+  <key>RunAtLoad</key>
+  <true/>
+  <key>KeepAlive</key>
+  <false/>
+  <key>UserName</key>
+  <string>#{`whoami`.chomp}</string>
+  <key>WorkingDirectory</key>
+  <string>#{HOMEBREW_PREFIX}</string>
+  <key>StandardErrorPath</key>
+  <string>#{var}/log/graylog2-server/error.log</string>
+  <key>StandardOutPath</key>
+  <string>#{var}/log/graylog2-server/output.log</string>
+</dict>
+</plist>
+EOS
+  end
+
   def test
     system "#{bin}/graylog2ctl"
   end