ocfl

OCFL for Ruby

This is an implementation of the Oxford Common File Layout (OCFL) for Ruby. See https://ocfl.io for more information about OCFL.

Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add ocfl

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install ocfl

Usage

storage_root = OCFL::StorageRoot.new(base_directory: '/files')
storage_root.exists?
# => false
storage_root.valid?
# => false

storage_root.save
storage_root.exists?
# => true
storage_root.valid?
# => true

object = storage_root.object('bc123df4567') # returns an instance of `OCFL::Object`
object.exists?
# => false
object.valid?
# => false
object.head
# => 'v0'

Versions

To build out an object, you'll need to create one or more versions.

There are three ways to get a version within an existing object directory.

Start a new version

new_version = object.begin_new_version
new_version.copy_file('sig/ocfl.rbs', destination_path: 'ocfl/types/generated.rbs')
new_version.save

object.exists?
# => true
object.valid?
# => true
object.head
# => 'v1'

Modify the existing head version

new_version = object.head_version
new_version.delete_file('sample.txt')
new_version.copy_file('sig/ocfl.rbs')
new_version.save

Overwrite the existing head version

new_version = object.overwrite_current_version
new_version.copy_file('sig/ocfl.rbs')
new_version.save

File paths

# List file names that were part of a given version
object.versions['v1'].file_names
# => ["ocfl.rbs"]

# Or on the head version
directory.head_version.file_names
# => ["ocfl.rbs"]

# Get the path of a file in a given version
object.path(filepath: "ocfl.rbs", version: "v1")
# => <Pathname:/files/[object_root]/v1/content/ocfl.rbs>

# Get the path of a file in the head version
object.path(filepath: "ocfl.rbs")
# => <Pathname:/files/[object_root]/v1/content/ocfl.rbs>

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/sul-dlss/ocfl.