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Let Capistrano Compile Ruby 1.9 For You

Posted: June 2nd, 2009 | Author: Jerod | Filed under: Debian | Tags: , | Comments Off

A Capistrano task to install Ruby 1.9.1 to “/opt/ruby-1.9.1” on Debian:
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Capify – public key deployment

Posted: July 11th, 2008 | Author: Jerod | Filed under: Ruby | Tags: , | Comments Off

I’ve been playing with Capistrano a lot lately and loving it. Here is an example of how easy it is to write tasks and use them on multiple remote servers.

This task installs your SSH public key on the remote machine to allow key-based authentication:

set :key_file do
  Capistrano::CLI.ui.ask "enter public key to push: "
end
 
desc "configures key-based SSH administration"
task :push_key, :roles  => :all do
  key_location = File.expand_path(key_file)
  unless File.exist?(key_location) and key_file.match(/\.pub$/)
    puts "Couldn't locate public key. Try again"
    exit
  end
  key_file_name = File.basename(key_location)
  upload key_location, "/tmp/#{key_file_name}"
  run "if [ ! -e ~/.ssh ];then mkdir ~/.ssh; fi"
  run "cat /tmp/#{key_file_name} >> ~/.ssh/authorized_keys"
  run "rm /tmp/#{key_file_name}"
  run "chmod 600 ~/.ssh/authorized_keys"
end

Silky smooth.

git clone & pull without changing directories

Posted: May 19th, 2008 | Author: Jerod | Filed under: Ruby | Tags: , | Comments Off

If you’re trying to configure git commands in a directory that isn’t pwd, you’ll have to deal with clone and pull a little differently. Clone works like this:

git clone [source location] [destination location]

An example clone into my application’s vendor directory:

git clone git://github.com/rails/rails.git ~/rails/myapp/vendor/rails

Pull works like this:

git --git-dir=/path/to/destination/.git pull

An example pull in the already initiated local rails repository:

git --git-dir=~/rails/myapp/vendor/rails/.git pull

Using these approaches, you can simplify your capistrano recipes. here is an example snippet:

set :rails_source, "git://github.com/rails/rails.git"
 
desc "git the latest rails"
task :git_rails do
  run "mkdir -p #{shared_path}/vendor"
  result = run_and_return "ls #{shared_path}/vendor"
  if result.match(/rails/)
    run "git --git-dir=#{shared_path}/vendor/rails/.git pull"
  else
    run "git clone #{rails_source} #{shared_path}/vendor/rails"
  end
end

See man git-clone and man git-pull for more details.