```ruby
# This code is free software; you can redistribute it and/or modify it under
# the terms of the new BSD License.
#
# Copyright (c) 2012, Sebastian Staudt

if defined? ::NewRelic
  def task_with_tracing(options)
    caller_method = options.keys.first.to_s

    task options do
      include NewRelic::Agent::Instrumentation::ControllerInstrumentation

      perform_action_with_newrelic_trace name: caller_method, category: :task, force: true do
        yield
      end
    end
  end
else
  class << self
    alias_method :task_with_tracing, :task
  end
end

namespace :braumeister do

  Rails.logger = Logger.new STDOUT

  desc 'Completely regenerates all repositories and their formulae'
  task_with_tracing regenerate: :environment do
    Repository.all.each do |repo|
      repo.authors.clear
      repo.formulae.clear
      repo.revisions.clear
      repo.sha = nil
      FileUtils.rm_rf repo.path
      repo.refresh
      repo.save!
    end
  end

  desc 'Regenerates the history of all repositories'
  task_with_tracing regenerate_history: :environment do
    Repository.all.each &:generate_history!
    repo = Repository.find_or_create_by name: HOMEBREW
    repo.generate_history!
  end

  desc 'Pulls the latest changes from the repositories'
  task_with_tracing update: :environment do
    Repository.all.each &:refresh
  end

end
```

Enable rake tasks to select a specific repository
user
```ruby
# This code is free software; you can redistribute it and/or modify it under
# the terms of the new BSD License.
#
# Copyright (c) 2012, Sebastian Staudt

if defined? ::NewRelic
  def task_with_tracing(options)
    caller_method = options.keys.first.to_s

    task options do
      include NewRelic::Agent::Instrumentation::ControllerInstrumentation

      perform_action_with_newrelic_trace name: caller_method, category: :task, force: true do
        yield
      end
    end
  end
else
  class << self
    alias_method :task_with_tracing, :task
  end
end

namespace :braumeister do

  Rails.logger = Logger.new STDOUT

  task :select_repos, [:repo] => :environment do |t, args|
    @repos = args[:repo].nil? ? Repository.all : Repository.where(name: args[:repo])
  end

  desc 'Completely regenerates one or all repositories and their formulae'
  task_with_tracing :regenerate, [:repo] => :select_repos do
    @repos.each do |repo|
      repo.authors.clear
      repo.formulae.clear
      repo.revisions.clear
      repo.sha = nil
      FileUtils.rm_rf repo.path
      repo.refresh
      repo.save!
    end
  end

  desc 'Regenerates the history of one or all repositories'
  task_with_tracing :regenerate_history, [:repo] => :select_repos do
    @repos.each &:generate_history!
  end

  desc 'Pulls the latest changes from one or all repositories'
  task_with_tracing :update, [:repo] => :select_repos do
    @repos.each &:refresh
  end

end
```
assistant