Category Archives: Ubuntu

QEMU Linu/xMipsel emulation

This tutorial will assume that you have a running QEMU environment and that it works. These are old notes that I am simply capturing here as a reference, so things may have changed regarding links etc. Please exercise some caution with copying and pasting!

First step is to create a disk image to use with our new OS:

qemu-img create -f qcow hda.img 10G 

This will hold all the files related to our MIPSel machine.

Now go and grab the kernel image:

wget http://ftp.de.debian.org/debian/dists/etch/main/installer-mipsel/current/images/qemu/netboot/vmlinux-2.6.18-6-qemu
wget http://ftp.de.debian.org/debian/dists/etch/main/installer-mipsel/current/images/qemu/netboot/initrd.gz

Now you should be able to start the installation process with

qemu-system-mipsel -M mips -kernel vmlinux-2.6.18-6-qemu -initrd initrd.gz -hda hda.img -append "root=/dev/ram console=ttyS0" -nographic 

Once you have gone through the debian installer, you can boot your new system with

qemu-system-mips -M mips -kernel vmlinux-2.6.18-6-qemu -hda hda.img -append "root=/dev/hda1 console=ttyS0" -nographic 

Maven for Android

This is a quick howto on setting up and using Maven for your Android projects. Maven Android integration is not yet excellent, but is coming along nicely, and if you are familiar with Maven projects, will make managing your dependencies a lot easier!

I will be working with Ubuntu, but your set up will be similar. Just adapt paths etc for your setup as you need.

Ubuntu ships with Maven2, but we need Maven-3.0.5 at least in order to work with Android. I prefer to install maven manually because you don’t need to stress about pinning and other such nonsense from a binary distro. I also usually install stuff in /opt/ so that is where we will be working from.

The first thing that you need to do, is to grab the maven distribution file. I used 3.2.1, but anything later than 3.0.5 should work OK.

wget http://apache.saix.net/maven/maven-3/3.2.1/binaries/apache-maven-3.2.1-bin.tar.gz

Extract the archive and copy it to /opt/

sudo cp apache-maven-3.2.1 /opt/

Great! First steps completed! You are doing well so far!
I am assuming that you have a semi-recent JDK installed, in our case we need JDK 6+. Check for your JDK version with

java -version

If all comes back OK, we are ready to proceed.

Get the path to your JDK now with

locate bin/java | grep jdk

and make a note of it. Mine is at

/opt/java7/jdk1.7.0_45

Edit your bashrc file (located at /etc/bash.bashrc on Ubuntu) and add the following parameters (modify according to your paths) to the end of the file:

export ANDROID_HOME=/opt/android-sdk-linux
export M3_HOME=/opt/apache-maven-3.2.1
export M3=$M3_HOME/bin
export PATH=$M3:$PATH
export JAVA_HOME=/opt/java7/jdk1.7.0_45
export PATH=$JAVA_HOME/bin:$PATH:/opt/java7/jdk1.7.0_45

Load up your new basrc file with

source /etc/bash.bashrc

and check that everything is OK.
You should now be able to test your brand new Maven3 installation with

mvn -version

If that seems OK, you are ready to install the Android m2e connector in Eclipse. Please note that this works best in Eclipse Juno or later (I use Kepler).

Open up Eclipse, and choose to install software from the Eclipse Marketplace. This is found in Help -> Eclipse Marketplace. Do a search for “android m2e” and install the Android configurator for M2E 0.4.3 connector. It will go ahead and resolve some dependencies for you and install.

You should now be able to generate a new Android project in Eclipse with New Project -> Maven -> new Maven project and in the archetype selection, look only in the Android catalogue or filter on “de.akquinet.android.archetypes” and choose the android quickstart project.

If this fails, you can also generate a new project on the command line and simply import it to Eclipse.

mvn archetype:generate \
  -DarchetypeArtifactId=android-quickstart \
  -DarchetypeGroupId=de.akquinet.android.archetypes \
  -DarchetypeVersion=1.0.11 \
  -DgroupId=com.your.company \
  -DartifactId=myshinyapp

Once all of that is complete, dev carries on as usual. Remember that now dependencies are in your POM.xml document, so check that out first and ensure that you have some basics in there:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.your.company</groupId>
	<artifactId>myshinyapp</artifactId>
	<version>1.0-SNAPSHOT</version>
	<packaging>apk</packaging>
	<name>myshinyapp</name>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<platform.version></platform.version>
		<android.plugin.version>3.6.0</android.plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>com.google.android</groupId>
			<artifactId>android</artifactId>
			<version>4.1.1.4</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>com.actionbarsherlock</groupId>
			<artifactId>actionbarsherlock</artifactId>
			<version>4.4.0</version>
		</dependency>

		<!-- Androlog is a logging and reporting library for Android -->
		<dependency>
			<groupId>de.akquinet.android.androlog</groupId>
			<artifactId>androlog</artifactId>
			<version>1.0.5</version>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.10</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>joda-time</groupId>
			<artifactId>joda-time</artifactId>
			<version>2.3</version>
		</dependency>

	</dependencies>
	<build>
		<finalName>${project.artifactId}</finalName>
		<pluginManagement>
			<plugins>
				<plugin>
					<groupId>com.jayway.maven.plugins.android.generation2</groupId>
					<artifactId>android-maven-plugin</artifactId>
					<version>${android.plugin.version}</version>
					<extensions>true</extensions>
				</plugin>
			</plugins>
		</pluginManagement>
		<plugins>
			<plugin>
				<groupId>com.jayway.maven.plugins.android.generation2</groupId>
				<artifactId>android-maven-plugin</artifactId>
				<configuration>
					<sdk>
						<platform>17</platform>
					</sdk>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

As you can see, I have included some other stuff, like ActionBarSherlock and JodaTime in case, as they are generally really useful, and it may save you some time just copying the dependency information!

Have fun!

logo-ubuntu_st_no®-black_orange-hex

To enable sudoers insults in Ubuntu

Reposted from old site – original date: 2009-06-11 19:07:38

1. use visudo to edit your sudoers config.

sudo visudo

2. Find the Defaults line. In Jaunty it looks like this:

Defaults        env_reset

Change it to:

Defaults        env_reset,insults

3. Quit your sudo session with sudo -K or just exit

Next time you screw up, Ubuntu will insult you (or your users)!