No One Is Perfect

A reluctant foray into the world of blogging.

Archive for category Software Development

AWS CloudFront invalidation

Aug 23

Posted by Tom in My Code, Software Development | No Comments

It is now possible to invalidate objects (files) in AWS CloudFront distributions. Handy when someone, like me, occasionally publishes files with the wrong content type. Here is how I implement this invalidation in python.

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JRuby rake and maven

Aug 20

Posted by Tom in Software Development | No Comments

I cannot stand Maven. It makes me nauseous. However that does not seem to be the case for other institutionalised developers. Here’s what I did on a project where I wanted to isolate its craziness and still use jruby and rake.

namespace :maven do

  M2_HOME = "binaries/apache-maven-3.0.3"

  desc "Run the maven package goal"
  task :package => :clean do
    mvn "package"
  end

  desc "Run the application"
  task :application => :clean do
    mvn "test-compile", "exec:java", "-Dexec.mainClass=com.example.Application", "-Dexec.classpathScope=test"
  end

  desc "Run the maven dependencies report"
  task :dependencies do
    mvn "dependency:tree", "-DoutputFile=deps.txt"
  end

  def mvn(*args)
    require 'java'

    m2_conf = "#{M2_HOME}/bin/m2.conf"
    classpath = "#{M2_HOME}/boot/plexus-classworlds-2.4.jar"

    java.lang.System.setProperty('maven.home', M2_HOME)
    java.lang.System.setProperty('classworlds.conf', m2_conf)

    require classpath
    include_class Java::org.codehaus.plexus.classworlds.launcher.Launcher
    exit_code = Launcher.mainWithExitCode(args.flatten.to_java(:string))
    puts "Maven has completed with exit code: #{exit_code}"
    fail 'Build failed' if exit_code != 0
  end

end

You foul rancid beast.

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RubyGems in a JAR

Aug 20

Posted by Tom in Software Development | No Comments

On a few projects now I’ve used jruby with rake. I know that I can use rvm and just fetch the gems per project, but for developers stuck on windows that way is a little more than difficult. So here’s how I package up rubygems in a JAR.

#!/bin/bash
mkdir gemjar
java -jar jruby-complete-1.6.3.jar -S gem install -i ./gemjar haml --version 3.1.2 --no-rdoc --no-ri
java -jar jruby-complete-1.6.3.jar -S gem install -i ./gemjar net-scp --version 1.0.4 --no-rdoc --no-ri
java -jar jruby-complete-1.6.3.jar -S gem install -i ./gemjar jruby-openssl --version 0.7.4 --no-rdoc --no-ri
java -jar jruby-complete-1.6.3.jar -S gem install -i ./gemjar fpm --version 0.3.7 --no-rdoc --no-ri
jar cf ruby-gems.jar -C gemjar .
rm -rf gemjar

You then invoke jruby rake via:

#!/bin/bash
java -jar jruby-complete-1.6.3.jar -rruby-gems.jar -S rake build.rb $@

This means that you can then invoke the following useful little nuggets:

task :list_gems do
  require "rubygems/gem_runner"
  Gem::GemRunner.new.run ["list"]
end

task :sass_watch do
  require 'haml'
  require 'haml/exec'
  opts = Haml::Exec::Sass.new ['--watch', 'src/main/sass:src/main/webapp/static/css']
  opts.parse!
end

task :ssh_copy, :file do |t, args|
  require "net/ssh"
  require "net/scp"
  Net::SSH.start("repository.remote", "user") do |ssh|
    ssh.scp.upload!(args.file, "/tmp/files/")
  end
end

task :make_rpm => :make_war do
  fail "Please install rpm-build to make RPMs!" unless system("rpmbuild --version")

  require "fpm"
  require "fpm/program"
  exit_code = FPM::Program.new.run([
    "-s", "dir", "-t", "rpm", "-n", APPLICATION_NAME, "-v", RPM_VERSION_NUMBER, "-a", "all",
    "--post-install", "target/rpmbuild/opt/application/bin/post_install.sh",
    "--pre-uninstall", "target/rpmbuild/opt/application/bin/pre_uninstall.sh",
    "-C", "target/rpmbuild", "opt"
  ])

  fail "Build failed" if exit_code != 0
end

How awesome is this?

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