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RJGit

A JRuby wrapper around the JGit library for manipulating Git repositories, the Ruby way.

Summary

RJGit provides a fully featured library for accessing and manipulating git repositories by wrapping the Java JGit library. It thus provides similiar functionality as e.g. rugged on JRuby.

Installation

Install the rjgit gem with:

$ gem install rjgit

Version scheme

RJGit's version number is the version of jgit used, plus our own patch level counter. For instance, RJGit 4.0.1.0 uses jgit 4.0.1, patch level 0.

Usage

RJGit wraps most (if not all) of JGit's core functionality; it has classes for all important Git objects, i.e., Repo, Blob, Tree, Commit, and Tag. It allows parsing and manipulation of these objects in an intuitive manner, either simulating ordinary git usage (with a working directory on disk) or on a lower level, through creating new git objects manually (also works with 'bare' repositories, without a working directory).

See below for some examples of what you can do with RJGit. Make sure you have JRuby installed.

Require the gem and include the RJGit module

require "rjgit"
include RJGit

Initializing an existing repository on the filesystem

repo = Repo.new("repo.git")

Creating a new repository

repo = Repo.new("repo.git", :create => true)
repo = Repo.new("repo.git", :create => true, :is_bare => true) # Create a 'bare' git repo.
repo.bare? # Is this a bare repository?

Getting commits

repo.commits('master')
repo.commits('959329025f67539fb82e76b02782322fad032821')
repo.head
commit = repo.commits('master').first # a Commit object; try commit.actor, commit.id, etc.

Getting branches

repo.branches

Finding a single object by SHA

repo.find('959329025f67539fb82e76b02782322fad032821')
repo.find('959329025f67539fb82e76b02782322fad032821', :commit) # Find a specific :commit, :blob, :tree, or :tag

Blobs and Trees

blob = repo.blob("example/file.txt") # Retrieve a file by filepath, from the HEAD commit...
blob = repo.blob("example/file.txt", "refs/heads/mybranch') # Retrieve the same file from a different branch
blob = repo.find("959329025f67539fb82e76b02782322fad032822", :blob) # ...or by SHA
blob.data # Cat the file; also blob.id, blob.mode, etc.
tree = repo.tree("example") # Retrieve a tree by filepath...
tree = repo.find("959329025f67539fb82e76b02782322fad032000", :tree) #...or by SHA
tree.data # List the tree's contents (blobs and trees). Also tree.id, tree.mode, etc.
tree.each {|entry| puts entry.inspect} # Loop over the Tree's children (Blobs and Trees)
tree.find_blob {|entry| entry[:name] == 'foo.txt'} # Find a single blob that matches the block
tree.find_tree {|entry| entry[:name] == 'mytree' } # Find a single tree that matches the block
tree.find {|entry| ...} # Find a single entry that matches the block
tree.find_all {|entry entry[:name].include?('.') } # Find all entries matching the block
tree.trees # An array of the Tree's child Trees
tree.blobs # An array of the Tree's child Blobs
Porcelain::ls_tree(repo, repo.tree("example"), :print => true, :recursive => true, :ref => 'mybranch') # Outputs the Tree's contents to $stdout. Faster for recursive listing than Tree#each. Passing nil as the second argument lists the entire repository. ref defaults to HEAD.

Getting tags

tag = repo.tags['example_tag']
tag.id # tag's object id
tag.author.name # Etcetera
some_object = Porcelain.object_for_tag(repo, tag) # Returns the tagged object; e.g. a Commit

Getting notes

repo.notes
note = repo.head.note
note.message # the String message of the note
note.annotates # the SHA ID of the object this note is attached to
repo.head.note = "Happy note writing"
repo.head.note_remove

Getting diffs

sha1 = repo.head.id
sha2 = repo.commits.last.id
options = {:old_rev => sha2, :new_rev => sha1, :file_path => "some/path.txt", :patch => true}
Porcelain.diff(repo, options)

Logs

repo.git.log # Returns an Array of Commits constituting the log for the default branch
repo.git.log("follow-rename.txt", "HEAD", follow: true, list_renames: true) # Log for a specific path, tracking the pathname over renames. Returns an Array of TrackingCommits, which store the tracked filename: [#<RJGit::TrackingCommit:0x773014d3 @tracked_pathname="follow-rename.txt" ...>]

Creating blobs and trees from scratch

blob = Blob.new_from_string(repo, "Contents of the new blob.") # Inserts the blob into the repository, returns an RJGit::Blob
tree = Tree.new_from_hashmap(repo, {"newblob" => "contents", "newtree" => { "otherblob" => "this blob is contained in the tree 'newtree'" } } ) # Constructs the tree and its children based on the hashmap and inserts it into the repository, returning an RJGit::Tree. Tree.new_from_hashmap takes an RJGit::Tree as an optional third argument, in which case the new tree will consist of the children of that Tree *plus* the contents of the hashmap.

Committing and adding branches to repositories, 'porcelain' style (only works with non-bare repos)

repo.create_branch('new_branch') # Similarly for deleting, renaming
repo.checkout('new_branch')
repo.add('new_file.txt') # Similarly for removing
repo.commit('My message')
repo.update_ref(commit) # Fast forward HEAD (or another ref) to the commit just created

Committing and adding branches to repositories, 'plumbing' style (also works with bare repos)

repo = repo.new("repo.git")
tree = Tree.new_from_hashmap(repo, {"newblob" => "contents"}, repo.head.tree ) # As above, use the current head commit's tree as a starting point and add "newblob"
actor = RJGit::Actor.new("test", "test@repotag.org")
commit = Commit.new_with_tree(repo, tree, "My commit message", actor) # Create a new commit with tree as base tree

And more...

pack = RJGitReceivePack.new(repo) # Implement the smart-http protocol with RJGitReceivePack and RJGitUploadPack
pack.receive(client_msg) # Respond to a client's GET request
repo.config['remote origin']['url'] # Retrieve config values
Porcelain::diff(repo, options)
Porcelain::blame(repo, options)

Issues

Please let us know by creating a github issue.

Contributing

Fork the project
Create a new branch
Modify the sources
Add specs with full coverage for your new code
Make sure the whole test suite passes by running bundle exec rake
Push the branch up to GitHub
Send us a pull request

Authors

RJGit is being developed by:

License

(Modified BSD License)

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the organization nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.