1 files changed, 54 insertions, 4 deletions
diff --git a/lib/oxidized/cli.rb b/lib/oxidized/cli.rb
index c66ec8d..15d20c5 100644
--- a/lib/oxidized/cli.rb
+++ b/lib/oxidized/cli.rb
@@ -1,11 +1,14 @@
 module Oxidized
   class CLI
-    require 'oxidized'
     require 'slop'
+    require 'oxidized'
 
     def run
+      check_pid
       Process.daemon if @opts[:daemonize]
+      write_pid
       begin
+        Oxidized.logger.info "Oxidized starting, running as pid #{$$}"
         Oxidized.new
       rescue => error
         crash error
@@ -16,13 +19,16 @@ module Oxidized
     private
 
     def initialize
-      Log.info "Oxidized starting, running as pid #{$$}"
       _args, @opts = parse_opts
-      CFG.debug = true if @opts[:debug]
+
+      Config.load(@opts)
+      Oxidized.setup_logger
+
+      @pidfile = File.expand_path("pid")
     end
 
     def crash error
-      Log.fatal "Oxidized crashed, crashfile written in #{Config::Crash}"
+      Oxidized.logger.fatal "Oxidized crashed, crashfile written in #{Config::Crash}"
       open Config::Crash, 'w' do |file|
         file.puts '-' * 50
         file.puts Time.now.utc
@@ -40,5 +46,49 @@ module Oxidized
       end
       [opts.parse!, opts]
     end
+
+    def pidfile
+      @pidfile
+    end
+
+    def pidfile?
+      !!pidfile
+    end
+
+    def write_pid
+      if pidfile?
+        begin
+          File.open(pidfile, ::File::CREAT | ::File::EXCL | ::File::WRONLY){|f| f.write("#{Process.pid}") }
+          at_exit { File.delete(pidfile) if File.exists?(pidfile) }
+        rescue Errno::EEXIST
+          check_pid
+          retry
+        end
+      end
+    end
+
+    def check_pid
+      if pidfile?
+        case pid_status(pidfile)
+        when :running, :not_owned
+          puts "A server is already running. Check #{pidfile}"
+          exit(1)
+        when :dead
+          File.delete(pidfile)
+        end
+      end
+    end
+
+    def pid_status(pidfile)
+      return :exited unless File.exists?(pidfile)
+      pid = ::File.read(pidfile).to_i
+      return :dead if pid == 0
+      Process.kill(0, pid)
+      :running
+    rescue Errno::ESRCH
+      :dead
+    rescue Errno::EPERM
+      :not_owned
+    end
   end
 end