MySQL Permission Errors After Moving Datadir

I wanted to make space on my root partition and so moved my mysql data dir to /home/mysql in /etc/mysql/my.conf and received the following errors:

dwiel@dwiel:~$ sudo mysqld 091111 20:39:16 [Warning] Can't create test file /home/mysql/dwiel.lower-test 091111 20:39:16 [Warning] Can't create test file /home/mysql/dwiel.lower-test 091111 20:39:16 [Note] Plugin 'FEDERATED' is disabled. mysqld: Can't find file: './mysql/plugin.frm' (errno: 13) 091111 20:39:16 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 091111 20:39:16 InnoDB: Operating system error number 13 in a file operation. InnoDB: The error means mysqld does not have the access rights to InnoDB: the directory. InnoDB: File name ./ibdata1 InnoDB: File operation call: 'open'. InnoDB: Cannot continue operation.

The problem was with apparmor. It was restricting mysql from reading and writing to /home/mysql. To correct this I edited the file /etc/apparmor.d/usr.sbin.mysqld and added:

/home/mysql r, /home/mysql** rwk,

to the end of the file. Then restarted apparmor:

sudo /etc/init.d/apparmor restart

and then restarted apache with no problem

Build tolua++ files with makefile

Here is how you can have your makefile build your tolua++ .cpp and .h files for you. It should work for plain tolua also.

TOLUA = tolua++5.1
 
tolua_%.cpp tolua_%.h : %.pkg
	$(TOLUA) -o $(@:%.h=%.cpp) -H $(@:%.cpp=%.h) $<

this will generate tolua_file.cpp and tolua_file.h files from corresponding file.pkg files anytime they the .cpp or .h file is depended on somewhere else in the file. In my case I just added tolua_file.o to my list of objects. Here is the full makefile for the project which required this - for reference:

 
 
# LINUX
LIBLUA=lua5.1
# MAC OSX
#LIBLUA=lua
 
# LDFLAGS=-arch x86_64
OBJS = swarm.o group.o scene.o vmath.o tolua_group.o tolua_swarm.o tolua_vmath.o
CXX = g++
CXXFLAGS = -Wall -c -O2 `sdl-config --cflags`
LDFLAGS = -Wall `sdl-config --libs`
INCLUDES = -I./include -I/usr/include/lua5.1 -I/opt/local/include
LIBS = -L./lib -lANN -lGL -lGLU -llo -ltolua++5.1 -l$(LIBLUA)
TOLUA = tolua++5.1
 
tolua_%.cpp tolua_%.h : %.pkg
	$(TOLUA) -o $(@:%.h=%.cpp) -H $(@:%.cpp=%.h) $<
 
%.o: %.cpp
	$(CXX) $(INCLUDES) $(CXXFLAGS) -c $< -o $@
 
# the executable
swarm: $(OBJS)
	$(CXX) $(LDFLAGS) -o $@ $^ $(LIBS)

download

Howto install pyclutter 0.8.2 on Ubuntu

Ubuntu 8.04 has pyclutter 0.6.2 in the repositories while the current stable version is 0.8.2. Here is how I installed pyclutter 0.8.2 with all of the extra available libraries (gtk, gst, cairo):

download:

also make sure you have python-cairo-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev installed. There may be more required, but these were the only ones I didn't already have installed.

For some reason I had to configure all of these libraries with --prefix /usr to get pycluster to see all of them.

Also, configure pycluster with --enable-docs if you want any documentation.

have fun!

JQuery + Greasemonkey

Had to look around to figure out how to include jquery in greasemonkey. Should have just guessed this first; Just use the @require, and your standard jquery document ready code. Heres my template anyway.

 
// ==UserScript==
// @name           JQuery Template
// @author         Zach Dwiel
// @description    Provide a basic template for using jquery in greasemonkey
// @include        *://*
// @require        http://code.jquery.com/jquery-latest.js
// ==/UserScript==
 
$(document).ready( function() {
    // your jquery code here
}

Controlling Samples by Spitting Them

Last night, Nate and I were able to sucessfully and intuitively control up to 3 or 4 individual drums based on different sounds vocalized into a mic. The bass drum would play when 'oooh' was sung, a snare when 'eee' was sung and a cymbal when 'aaah' was sung. There are still some kinks in the system, but as a proof of concept, it works fairly well. The mapping between input sound and MIDI event are learned in real time so you are not restricted to different vowel sounds. The 3 distinguishing sounds could have just as easily been a clap, growl and whistle. The code: fftknn.

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