minecraft_server overviewer log rotation

--- minecraft_server    Sun Dec 23 15:47:12 2012
+++ minecraft_server    Sun Dec 23 15:51:52 2012
@@ -33,6 +33,8 @@
 #   watch <world>         - Watch the log file for the Minecraft world server.
 #   backup <world>        - Backup the Minecraft world.  Backup all worlds by
 #                           default.
+#   logrotate <world>     - Rotate the server.log file.
+#                           Will rotate the server log for all worlds by default.
 #   map <world>           - Run the Minecraft Overviewer mapping software on
 #                           the Minecraft world.  Map all worlds by default.
 #   update <software>     - Update a software package.  Update the server
@@ -162,6 +164,11 @@
 # Length in days that backups survive.
 BACKUP_DURATION=31

+## Server Log Configuration
+
+# How many rotations of server.log to keep
+LOG_COUNT=10
+

 ## Mirror image options.

@@ -489,6 +496,56 @@
    done
 }

+# Rotates the world server log file.
+#
+# @param 1 The world server generating the log to rotate.
+rotateLog() {
+   local WORLD_DIR LOG_LIST LOGBASE LOGTMP LOGNEW
+
+   WORLD_DIR="$WORLDS_LOCATION/$1"
+   # Use the mirror copy of the world directory if enabled.
+   if [ $ENABLE_MIRROR -eq 1 ] && [ -d $MIRROR_PATH ]; then
+       WORLD_DIR="$MIRROR_PATH/$1"
+   fi
+
+   # Make sure that the server.log file exists.
+   execute "touch $WORLD_DIR/server.log" $USER_NAME
+
+   # Scan the log for entires and skip rotate is none are found
+   local log_lines="$(cat "$WORLD_DIR/server.log" | wc -l )"
+
+   if [ "$log_lines" -le '1' ]; then
+       printf "No new log enteries to rotate. No changes made."
+       return 0
+   fi
+
+   # Server logfiles in chronological order
+   LOGLIST=$(ls -r $WORLD_DIR/server.log* | grep -v lck)
+
+   # Look at all the logfiles
+   for i in $LOGLIST; do
+       LOGTMP=$(ls $i | cut -d "." -f 3)
+       # If we're working with server.log, append .1 then compress it
+       if [ -z $LOGTMP ]; then
+           LOGTMP="$WORLD_DIR/server.log"
+           LOGNEW="${LOGTMP}.1"
+           execute "cp $WORLD_DIR/server.log $LOGNEW" $USER_NAME
+           execute "gzip $LOGNEW" $USER_NAME
+       # Otherwise, check if the file number is under $LOG_COUNT
+       elif [ $LOGTMP -eq $LOG_COUNT ]; then
+           # If so, delete it
+           execute "rm -f $i" $USER_NAME
+       else
+           # Otherwise, add one to the number
+           LOGBASE=$(ls $i | cut -d "." -f 1-2)
+           LOGNEW=$LOGBASE.$(($LOGTMP+1))
+           execute "cp $i $LOGNEW.gz" $USER_NAME
+       fi
+   done
+   # Blank the existing logfile to renew it
+   execute "cp \"/dev/null\" $WORLD_DIR/server.log" $USER_NAME
+}
+
 # Watch the world server log file.
 #
 # @param 1 The world server generating the log to watch.
@@ -907,6 +964,17 @@
            exit 1
        fi
    ;;
+   logrotate)
+       # Figure out which worlds to rotate the log.
+       WORLDS=$(checkOptionalArgument "$ALL_WORLDS" $0 $1 $2)
+       # Backup each world requested.
+       printf "Rotating Server Log:"
+       for WORLD in $WORLDS; do
+           printf " $WORLD"
+           rotateLog $WORLD
+       done
+       printf "\n"
+   ;;
    backup)
        # Figure out which worlds to backup.
        WORLDS=$(checkOptionalArgument "$ALL_WORLDS" $0 $1 $2)
@@ -1002,7 +1070,7 @@
        printf "\n"
    ;;
    *)
-       printf "Usage: $0 {start|stop|force-stop|restart|force-restart|status|sync|send|screen|watch|backup|update|map} {Optional: world or software package}\n"
+       printf "Usage: $0 {start|stop|force-stop|restart|force-restart|status|sync|send|screen|watch|backup|update|logrotate|map} {Optional: world or software package}\n"
        exit 1
    ;;
 esac