Testing Git merges using Grit

teste_merge.rb

require 'grit'
require 'fileutils'

# Define our paths.
# We're gonna have 3 paths: one original, one for the fork, and yet another one for the merge
root_path = "#{File.dirname(__FILE__)}/documents"
original_path = "#{root_path}/original_repo.git"
fork_path = "#{root_path}/fork_repo.git"
merge_path = "#{root_path}/merge_repo"

# Remove the directories to assure they are clean
FileUtils.rm_rf(original_path)
FileUtils.rm_rf(fork_path)
FileUtils.rm_rf(merge_path)

# Create the original repository and do our 1st commit
# At this time, we are using bare repositories.
# We are only going to need a working area to the merge
original_repo = Grit::Repo.init_bare(original_path)
original_index = original_repo.index
original_index.add('test_merge.txt', "hello1\n")
commit1 = original_index.commit('commit 1', nil, Grit::Actor.from_string("First User <first@user.com>"))
puts "Original repo commits - after 1st commit"
puts original_repo.commits.inspect
puts

# Do a bare fork on the original repository to create the fork repository
# Do our 2nd commit on the forked repository
fork_repo = original_repo.fork_bare(fork_path)
fork_index = fork_repo.index
fork_index.add('test_merge.txt', "hello1\nhello2\n")
commit2 = fork_index.commit('commit 2', commit1, Grit::Actor.from_string("Second User <second@user.com>"))
puts "Fork repo commits - after 2nd commit"
puts fork_repo.commits.inspect
puts

# Do our 3rd commit, on the original repository
original_index.add('test_merge.txt', "hello0\nhello1\n")
commit3 = original_index.commit('commit 3', commit1, Grit::Actor.from_string("First User <first@user.com>"))
puts "Original repo commits - after 3rd commit"
puts original_repo.commits.inspect
puts

# Clone the original repository into a new repository
# At this time we are accessing git directly through merge_repo.git
# We don't have methods for doing this in pure Ruby yet, I think
original_repo.git.clone({}, original_path, merge_path)
Dir.chdir(merge_path) do
  merge_repo = Grit::Repo.new('.')
  # Add the fork repository as a remote
  merge_repo.git.remote({}, "add", "fork", "../fork_repo.git")
  # Pull from the remote's master branch
  merge_repo.git.pull({}, "fork", "master")
end

# Open the merge_repo and shou 4 commits
# The first 3 are our commits, and the 4th is the merge commit
merge_repo = Grit::Repo.new(merge_path)
puts "Merge repo commits - no conflicts"
puts merge_repo.commits.inspect
puts