Class: GitModel::Transaction

Inherits:
Object
  • Object
show all
Defined in:
lib/gitmodel/transaction.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Transaction

Returns a new instance of Transaction.



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# File 'lib/gitmodel/transaction.rb', line 8

def initialize(options = {})
  self.branch = options[:branch] || GitModel.default_branch
  self.commit_message = options[:commit_message]
end

Instance Attribute Details

#branch ⇒ Object

Returns the value of attribute branch.



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# File 'lib/gitmodel/transaction.rb', line 5

def branch
  @branch
end

#commit_message ⇒ Object

Returns the value of attribute commit_message.



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# File 'lib/gitmodel/transaction.rb', line 6

def commit_message
  @commit_message
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/gitmodel/transaction.rb', line 4

def index
  @index
end

Instance Method Details

#execute(&block) ⇒ Object 



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# File 'lib/gitmodel/transaction.rb', line 13

def execute(&block)
  if index 
    # We're already in a transaction
    yield self
  else
    # For now there's a big ugly lock here, this will be fixed!
    # TODO move this lock around the commit only (need to make sure two
    # processes aren't updating refs/heads/<branch> at the same time) and
    # make concurrent transactions can work. This will require some merging
    # magic!
    lock do
      # We're not in a transaction, start a new one
      GitModel.logger.debug "Beginning transaction on #{branch}..."

      # Save the current head so that concurrent transactions can work. We need
      # to make sure the parent of this commit is the same SHA that this
      # index's tree is based on.
      parent = GitModel.last_commit(branch)

      self.index = Grit::Index.new(GitModel.repo)
      index.read_tree(parent.to_s)
      
      yield self

      committer = Grit::Actor.new(GitModel.git_user_name, GitModel.git_user_email)
      sha = index.commit(commit_message, parent ? [parent] : nil, committer, nil, branch)
      # TODO return false and log if anything went wrong with the commit

      GitModel.logger.debug "Finished transaction on #{branch}."

      return sha
    end
  end
end

#lock(&block) ⇒ Object

Wait until we can get an exclusive lock on the branch, then execute the block. We lock the branch by creating refs/heads/<branch>.lock, which the git commands also seem to respect



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# File 'lib/gitmodel/transaction.rb', line 51

def lock(&block)
  lockfile = Lockfile.new File.join(GitModel.repo.path, 'refs/heads', branch + '.lock')
  begin
    lockfile.lock
    yield
  ensure
    lockfile.unlock
  end
end