demo.rb

require 'bundler/setup'
Bundler.require

repo = Rugged::Repository.new('.')

p repo
p repo.head

#ToDo modify txt
#data = File.read(./rugged_test)

repo.index.add('rugged_test')
repo.index.write


builder = Rugged::Tree::Builder.new
repo.index.entries.each do |entry|
  builder << {
    type: :blob,
    name: entry[:path],
    oid: entry[:oid],
    filemode: entry[:mode]
  }
end

tree_sha = builder.write(repo)

author = {
  name: 'sandinist',
  email: 'sandinista21@gmail.com',
  time: Time.now
}

id = Rugged::Commit.create(repo,
  message: "from rugged\n",
  committer: author,
  author: author,
  parents: [repo.head.target],
  tree: tree_sha,
  update_ref: 'HEAD'
)

p id

Gemfile

source :rubygems

gem 'rugged', '0.17.0.b6'

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    rugged (0.17.0.b6)

PLATFORMS
  ruby

DEPENDENCIES
  rugged (= 0.17.0.b6)

rugged_test

Hi.

Yeah.