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= THIS IS A DRAFT, WORK IN PROGRESS PROPOSAL, NOT AN ACTUAL OFFICIAL ECLIPSE PROJECT PROPOSAL YET =
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= Status =
  
= Introduction =
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The EGit project proposal has been accepted. Please visit the [http://www.eclipse.org/egit/ project page].
  
The EGIT project is a proposed open source project under the Eclipse Technology Project.
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* [http://www.eclipse.org/proposals/egit/ proposal]
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* [http://www.eclipse.org/newsportal/thread.php?group=eclipse.egit eclipse.egit newsgroup]
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* [http://www.eclipse.org/proposals/egit/Creation_Review_EGit_v3.pdf Creation Review docuware]
  
According to the [http://www.eclipse.org/projects/dev_process/ Eclipse Development Process], this proposal is intended to declare the intent and scope of the EGIT project as well as to gather input from the Eclipse community. You are invited to comment on and/or join the project. Please send all feedback to the http://www.eclipse.org/newsportal/thread.php?group=eclipse.technology.egit newsgroup.
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= Relation to other Eclipse projects and other open source projects =
  
= Background =
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* [http://git.or.cz Git] - The fast distributed SCM 
The EGIT plugin is a Team provider for Git (a.k.a. "Stupid Content Tracker", http://git.or.cz).
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* JGit - a pure Java implementation of Git licensed under a BSD style license.
  
Git is the version control system originally developed for the Linux kernel by Linus Torvalds, and is now a general Software Configuration Management (SCM) and Distributed Version Control System (DVCS) used by many other projects, both for open source and commercial development. Git is a fast distributed SCM, which means every developer has a full copy of all history of every revision of the code making queries against the history very fast and versatile. The storage model also means most operations are ten to a hundred times faster than with traditional centralized SCMs such as CVS or Subversion. The integrity of the code is protected through the use of secure hashes of content and history, plus optional GPG(PGP)-signing of tags.
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* Eclipse Linux project: there is natural affinity between Git and Linux, since it is the SCM of choice for the Linux kernel
  
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* Eclipse platform team support and existing providers:
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** CVS team provider
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** SVN team provider
  
= Project Goal =
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* Other DVCS projects with Eclipse plugins. We might benefit from sharing API's for certain DVCS related features
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** [http://bazaar-vcs.org/BzrEclipse BzrEclipse ]
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** [http://www.vectrace.com/mercurialeclipse/ Mercurial Eclipse]
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** [http://eclipsedarcs.org/doku.php EclipseDarcs]
  
The goal is to implement a Team provider for the Git SCM for eclipse.
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* Eclipse PDE build: to provide a Git adapter for PDE build fetching from Git repositories
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**  Looks like we want an ant task for this
  
= Project Scope =
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* Mylyn - a Task based IDE that provides privileged integration with Eclipse-supported team providers . A possible integration with EGit could be considered.
  
The project will implement a significant amount of functionality of Git in Java for use with primarily Eclipse, although the intention is that core functionality shall be usable outside the Eclipse platform. The limit to what can be implemented in Java is to be discovered. Core functionality is already implemented so we think that most if not all can be implemented in Java without significant performance loss.
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* Buckminster - A build and assembly framework. Needs to know about git to be able to clone projects
 
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Performance is a big deal with git. It affects what can be done by being so much faster. Things that couldn't be done because of time constraints are now possible. These things like very fast checkouts, branching, branch switching, merging, tagging, software archeology and synchronization. Merge speed is probably the most important feature.
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The Git plugin shall be fully compatible with the native version so both can be used on the same checkout out repository.
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= Project description =
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The Git team provider will provide the ability to do all everyday task in a Git work flow from inside Eclipse.
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== Features ==
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* Initial project setup: The plugin will allow user to create new Git repositories.
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* Importing existing code: Existing local Git repositories as well as remote repository can be imported. Remote repositories are imported by `cloning' them resulting in a local copy.
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* Replicating repositories: It shall be possible to distribute local version to other repositories through "push" operations as well as patches distributed by electronic mail. Receiving content shall be possible by fetching content via the git protocol (raw, ssh and http based) and via e-mailed patches directly from mailboxes, file or clipboard. "Bundles" shall also be supported.
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* Quickdiff against any version shall be supported.
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* Comparing any versions shall be supported.
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* Producing git-format patches to the clipboard shall be supported.
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* Selective commit (using the Quickdiff markers) shall be supported
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* Merge shall be supported
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* Cherry picking shall be supported
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* Re-base of branches shall be supported. This includes splitting, reordering and squashing (alternate term not to be confused with the normal meaning of "merge" in SCM terminology).
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* Branch switching, committing, amending commits and reset shall be supported.
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* Partial checkouts (currently not a native Git feature) shall be possible.
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* Some form of synchronization with CVS. At least export to CVS, like git cvsexportcommit.
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== Perspectives ==
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A Git perspective will be provided for browsing repositories before importing Git projects.
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== Extension points ==
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Quickdiff must be enhanced to allow selective committing.
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== Views ==
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A history viewer with graphical presentation of history and access for compare editors.
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== Repository browser ==
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An explorer for examining Git repositories not connected to an eclipse project. Importing projects shall be possible from here.
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== Extensions to existing Eclipse Team functionality ==
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Team provider
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Resource decorators
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Quickdiff provider
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== CVS export ==
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Git commits shall be exportable to a CVS repository with the same structure.
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CVS import is a much harder problem where no perfect solution exists.
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= Initial Code contributions =
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The existing code base shall be re-licensed under the EPL (this has already been approved by current comitters).
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= Relation to other projects, dependencies =
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* Git - The SCM we want to provide an interface through. http://git.or.cz
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* Mylyn - Task based IDE. Git is very much about simplifying the delivery of well defined solutions to specific problems in an orderly fashion so it seems both projects have similar objectives. I have no idea about what git integration with Mylyn would look like for lack of Mylyn knowledge.
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add blurb on jGit
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SVN team provider
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Eclipse platform team support
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CVS support
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= Development plan =
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==Project Organization==
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=== Lead ===
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Shawn Pearce
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=== Initial Committers ===
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* Robin Rosenberg
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* Shawn Pearce
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* Philippe Ombredanne
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=== Milestones planning ===
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Some functionality already exists, but there is no real plan at the moment for lack of committed resources. A rough idea of prioritization is
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Already done:
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* Connect to/create repositories for exiting projects
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* Create branches
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* Commit
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* Quickdiff against current revision
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* Resources decorators for tracked and modified resources as well as repository state
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* Basic compare of revisions
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Underway:
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* Cloning and updating from remote repositories
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Future:
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* Bisecting
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* Partial commits (i.e. committing partial changes)
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* Comprehensive handling of different character encodings in filenames and comments.
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* CRLF handling (unless we consider it unneeded)
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* Bugfixes for existing code
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* Formatting code for patch submission through e-mail
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* Apply patch
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* Rename/Copy tracking in compare revisions
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* Blame (annotate)
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* Merge
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* Rebase
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* External repository browser
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* Repacking (this a really a core Git feature and the one that can be really hard or impossible to perform in Java).
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* Rename tracking is an on-demand feature in git. Git does not record such information, it discovers it from content. The tight data structures in git makes implementing this in real time possible, but could still be a challenge.
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Latest revision as of 10:29, 16 September 2009

Status

The EGit project proposal has been accepted. Please visit the project page.

Relation to other Eclipse projects and other open source projects

  • Git - The fast distributed SCM
  • JGit - a pure Java implementation of Git licensed under a BSD style license.
  • Eclipse Linux project: there is natural affinity between Git and Linux, since it is the SCM of choice for the Linux kernel
  • Eclipse platform team support and existing providers:
    • CVS team provider
    • SVN team provider
  • Eclipse PDE build: to provide a Git adapter for PDE build fetching from Git repositories
    • Looks like we want an ant task for this
  • Mylyn - a Task based IDE that provides privileged integration with Eclipse-supported team providers . A possible integration with EGit could be considered.
  • Buckminster - A build and assembly framework. Needs to know about git to be able to clone projects

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