The following script will remove all the workspace builds from Jenkins that exist, reset the build number for all projects specified
in the .hudson/jobs directory.

Use it with care. I take no responsibility for misuse of this or bugs etc…

On another note, there is a plugin available for Jenkins that allows you to change the build number, see: http://wiki.hudson-ci.org/display/HUDSON/Next+Build+Number+Plugin

#
# Hudson build cleaner
# Cleans out all builds for projects that exist in the directory
# Resets the build number to 1
# Backup all projects before running this
 
function cleanbuild {
 
  echo "cleaning $1"
  cd $1
  ls -l
  rm -Rf builds/*
  rm -Rf lastSuccesful
  rm -Rf lastStable/
  rm -Rf workspace/*
  rm -Rf modules/*
  rm -f lastSuccessful lastStable
  rm -f nextBuildNumber
  touch nextBuildNumber
  echo 1 >> nextBuildNumber
  cd -
}
 
for project in `find -L -maxdepth 1 -type d -name '*' ! -name '.*' -printf '%f\n' | column`
do
  cleanbuild $project
done

However, it didn’t prove to be the most straightforward of installs. Just a few tips here based on what I did:

I checked out the source code from the trunk of the Subversion repository. The reason I did this was because the binary that was installed didn’t include a PMS.conf, not sure whether I could have manually created it.

svn checkout http://ps3mediaserver.googlecode.com/svn/trunk/ ps3mediaserver-read-only

then proceeded to build it with ant form the Apache website.

ant

After that it was a case of configuring it. It appears that it installs the PMS.conf file in:

$/.config/PMS/PMS.conf

so you need to go there to configure it.

I had to change the network interface that it bound on and the port used.

That proved to be a pain as none of the configuration options are documented. I ended up digging out the PmsConfiguration.java file from the source, link here:

http://code.google.com/p/ps3mediaserver/source/browse/trunk/ps3mediaserver/net/pms/configuration/PmsConfiguration.java

That contains all the names of the keys you need so for my purposes I needed the following in PMS.conf:

network_interface = eth0

Starting this up with:

pms.sh &

and scanning via the Playstation 3 Video -> Detect MediaServers brings up my PS3MediaServer.

There’s also a help forum here:

http://www.ps3mediaserver.org/forum

If you’re using phpmyadmin to update the database directly the only two changes you have to make are to the site_url and home option-name‘s in wp_options. Make sure you change the option_value for each of these to the new address.

One of the problems you may come across is that your old posts may reference the old domain in same way. If you want to update these then it’s laborious and manual task of editing them in the database – which can be error prone, unless done carefully. You can run a SQL update to update the domain in the post_content column of the wp_posts table as follows:

UPDATE wp_posts SET post_content = REPLACE(post_content, 'olddomain.com', 'newdomain.com');

I used this method to update the guid column to reference my new domain instead of my old domain.

Make sure you backup your database before running this. It’s a pretty easy process to do the backup of a MySQL database.

mysqldump -u username -p -v old.db > old.sql

If you’re also renaming your database in relation to your domain name move you can use the following:

mysqldump -u username -p -v old.db > old.sql
mysqladmin -u username -p create newdb
mysql -u username -p newdb < old.sql

http://www.cloudera.com/blog/2009/08/hadoop-default-ports-quick-reference/

Installation involved downloading the hadoop distribution and creating the right configurations (core-site.xml, hdfs-site.xml and mapred-site.xml). It also involved formatting the namenode and starting everything up. It’s a pain to do manually so I wrote a script to do the whole lot to save time. A few caveats:

• You need to set the JAVA_HOME location on your machine at the top of the script
• Specify the distro name (hadoop-0.20.2) to match the apache download link
• Configure passwordless SSH for your local machine

You can configure passwordless SSH as follows:

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa_for_hadoop
cat ~/.ssh/id_dsa_for_hadoop.pub >> ~/.ssh/authorized_keys

Hopefully that’ll save you a bunch of time! : )

I found this when running WordPress with Apache2. In order to fix this you need to make sure that the Apache site configuration file, in my case /etc/apache2/sites-available/clientsite. In the clientsite configuration file you should make sure that the following settings exist:

Options Indexes FollowSymLinks MultiViews
AllowOverride all
Order allow,deny
allow from all

I needed to change AllowOverride from none to all in order to make WordPress permalinks work for Month and Name.

For more info on AllowOverride and Apache configuration see:

http://httpd.apache.org/docs/2.0/mod/core.html#allowoverride

One solution to avoid this (at least temporarily) is to use Maven’s system scope and systemPath feature:

<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.3.0</version>
<scope>system</scope>
<systemPath>${basedir}/lib/zookeeper-3.3.0.jar</systemPath>
</dependency>

This will reference a dependency from the local filesystem, which means you do not have to install the JAR into the repository in order to use it. This is particularly useful when you’re doing some prototyping or research into a new technology.

By the way Zookeeper does provide support for Maven, see https://issues.apache.org/jira/browse/ZOOKEEPER-224

For more information see: http://maven.apache.org/general.html#tools-jar-dependency

http://docs.fabfile.org/0.9.0/installation.html

First up a standard Python install (I used 2.6.2) and setup tools 0.6c11:

http://pypi.python.org/pypi/setuptools

and create a simple fabric script (fabfile.py)

from fabric.api import local, env, put
env.hosts = ["elephant@babar.net:40"]
env.show = ['debug']
def deploy():
	print "Deploying...";
	put("fabtest.txt", "/tmp/fabtest.txt");
	print "All Done...";

From there:

easy_install fabric

will result in:

...
Installed f:\python26\lib\site-packages\fabric-0.9.0-py2.6.egg
Processing dependencies for fabric
Searching for pycrypto>=1.9
Reading http://pypi.python.org/simple/pycrypto/
Reading http://pycrypto.sourceforge.net
Reading http://www.amk.ca/python/code/crypto
Best match: pycrypto 2.0.1
Downloading http://www.amk.ca/files/python/crypto/pycrypto-2.0.1.tar.gz
Processing pycrypto-2.0.1.tar.gz
Running pycrypto-2.0.1\setup.py -q bdist_egg --dist-dir f:\docume~1\admini~1\loc
als~1\temp\easy_install-clrpu1\pycrypto-2.0.1\egg-dist-tmp-1wszmf
error: Setup script exited with error: Unable to find vcvarsall.bat

You can solve this in a number of ways, the easiest of which is to install the binary for pycrypto manually from here:

http://www.voidspace.org.uk/downloads/pycrypto-2.0.1.win32-py2.6.exe

Next, try running fabric using: fab -f fabfile.py deploy. This results in:

Traceback (most recent call last):
  File "F:\Python26\Scripts\fab-script.py", line 8, in <module>
    load_entry_point('fabric==0.9.0', 'console_scripts', 'fab')()
  File "f:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.p
y", line 277, in load_entry_point
  File "f:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.p
y", line 2180, in load_entry_point
  File "f:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.p
y", line 1913, in load
  File "build\bdist.win32\egg\fabric\main.py", line 17, in <module>
  File "build\bdist.win32\egg\fabric\api.py", line 9, in <module>
  File "build\bdist.win32\egg\fabric\context_managers.py", line 12, in <module>
  File "build\bdist.win32\egg\fabric\state.py", line 125, in <module>
  File "build\bdist.win32\egg\fabric\state.py", line 74, in _get_system_username
 
ImportError: No module named win32api

Install the pywin32 extensions from here:

http://sourceforge.net/projects/pywin32/files/

and finally run fabric again (fab -f fabfile.py deploy), the script should run fine this time…

All Done...
Done.
Disconnecting from babar.net:40... done.

EnvironmentError: mysql_config not found
When trying to install MySQL-python
It was fixed by installing the libmysqlclient15-dev package and the installing the egg again:

sudo apt-get install libmysqlclient15-dev
easy_install MySQL_python-1.2.3c1-py2.5-linux-i686.egg

Package details here:

http://packages.debian.org/search?searchon=contents&keywords=mysql_config&mode=path&suite=stable&arch=any

As David comments, “It can be the easiest thing to create a logo for a client but when it comes to assessing what style of identity can best represent yourself or your business, this is a different matter altogether. It is tempting to use your own brand as a showcase of all your best techniques and ideas but this must be balanced with modesty and professionalism to gain the correct tone for your business image.”

Check out the full article (including our logo) here: http://www.dache.ch/dache/comments/100_Brands_of_Interest_II/

A pastebin allows you to share a patch/code selection/text selection with other people without having to resort to email/instant messenger.  You can either interact with pastebin via the URL or above or install the Eclipse plugin.  If you’ve installed the Eclispe plugin you then right click on the code/text you want to share and select Pastebin->Create Pastebin from the menu.  More instructions and screenshots are available on the website.

The Eclipse architecture is a little strange to start with, the support it provides via the extensions framework is easy enough to understand, although I’m a little confused now that they’ve announced declarative services and their bizarre use of OSGi. The plugin uses the org.eclipse.ui.popupmenus extension.  Dependency wise, I used the Eclipse UI and runtime along with the JFace Textfield components to provide the URL for the created pastebin.  The main plugin itself is made up of an Activator class along with a NewPastebinAction class which implements IObjectActionDelegate which provides a run(IAction action) method.  This obtains the current selection and checks to see whether it is a TextSelection (editor content selection) or a StructuredSelection (a package explorer/navigator file selection).

The selection is then wrapped in a simple domain object and passed to a web client facade that uses the Apache HttpClient (http://hc.apache.org/httpclient-3.x/) framework to provide connectivity with the pastebin website.

Finally, it uses a custom OkInputDialog to present the pastebin URL back to the user.

It’s not perfect at present (I need to unpick the dependency on the JDT plugin for the StructuredSelection), but it serves as a first attempt at creating a Eclipse plugin and understanding the internals of the Eclipse API.  Also, it unfortunately does not autodetect the file type and convert it into the internal pastebin format.

Packaging the plugin was very straightforward.  It involved using the File->Export function provided by Eclipse to package it into an appropriate JAR file.  Alternatively, you can publish an update site, I did this by creating a new feature project (and adding the plugin to it) then exporting the the update site using Eclipse.

I’m going to take the pastebin as a starting point for more collaborative features.