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Shawn O. Pearce ece88b99eb Redo PackWriter object reuse output
Output of selected reuses is refactored to use a new ObjectReuseAsIs
interface that extends the ObjectReader.  This interface allows the
reader to control how it performs the reuse into the output stream,
but also allows it to throw an exception to request the writer to
find a different candidate representation.

The PackFile reuse code was overhauled, cleaning up the APIs so they
aren't exposed in the object loader, but instead are now a single
method on the PackFile itself.  The reuse algorithm was changed to do
a data verification pass, followed by the copy pass to the output.
This permits us to work around a corrupt object in a pack file by
seeking another copy of that object when this one is bad.

The reuse code was also optimized for the common case, where the
in-pack representation is under 16 KiB.  In these smaller cases
data is sent to the pack writer more directly, avoiding some copying.

Change-Id: I6350c2b444118305e8446ce1dfd049259832bcca
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2010-06-26 14:46:05 -07:00
org.eclipse.jgit Redo PackWriter object reuse output 2010-06-26 14:46:05 -07:00
org.eclipse.jgit.console Start 0.9 development 2010-06-14 08:11:27 -07:00
org.eclipse.jgit.http.server Allow Repository.getDirectory() to be null 2010-06-25 18:03:41 -07:00
org.eclipse.jgit.http.test Use FileRepository where we assume other file semantics 2010-06-25 17:46:40 -07:00
org.eclipse.jgit.iplog Replace WindowCache with ObjectReader 2010-06-25 17:58:01 -07:00
org.eclipse.jgit.junit Rename Repository getWorkDir to getWorkTree 2010-06-25 18:03:41 -07:00
org.eclipse.jgit.packaging Change default target platform for maven build to galileo 2010-06-19 01:06:14 +02:00
org.eclipse.jgit.pgm Allow Repository.getDirectory() to be null 2010-06-25 18:03:41 -07:00
org.eclipse.jgit.test Use getObjectsDatabase().getDirectory() to find objects 2010-06-25 18:03:41 -07:00
org.eclipse.jgit.ui Merge changes I53f71dc0,I3a899a3a,I3e8bd245,Ie7c9db83,If396326e,I6f4cf8da,I3bf96dd0,I3a2a43a1,I292fe88c,Ia1cf40cf 2010-06-14 19:59:48 -04:00
tools tools/version.sh: Use backup files on Win32 2010-06-14 08:19:56 -07:00
.eclipse_iplog eclipse-iplog: Use contribution rather than bug element 2010-05-28 15:09:29 -07:00
.gitattributes Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
LICENSE Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
README Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
SUBMITTING_PATCHES Correcting explanation of EDL 2009-10-28 14:12:07 +01:00
pom.xml Start 0.9 development 2010-06-14 08:11:27 -07:00

README

            == Java GIT ==

This package is licensed under the BSD.

  org.eclipse.jgit/

    A pure Java library capable of being run standalone, with no
    additional support libraries.  Some JUnit tests are provided
    to exercise the library.  The library provides functions to
    read and write a GIT formatted repository.

    All portions of jgit are covered by the BSD.  Absolutely no GPL,
    LGPL or EPL contributions are accepted within this package.

  org.eclipse.jgit.test/
    Unit tests for org.eclipse.jgit and the same licensing rules.

            == WARNINGS / CAVEATS              ==

- Symbolic links are not supported because java does not support it.
  Such links could be damaged.

- Only the timestamp of the index is used by jgit check if  the index
  is dirty.

- Don't try the library with a JDK other than 1.6 (Java 6) unless you
  are prepared to investigate problems yourself. JDK 1.5.0_11 and later
  Java 5 versions *may* work. Earlier versions do not. JDK 1.4 is *not*
  supported. Apple's Java 1.5.0_07 is reported to work acceptably. We
  have no information about other vendors. Please report your findings
  if you try.

- CRLF conversion is never performed. On Windows you should thereforc
  make sure your projects and workspaces are configured to save files
  with Unix (LF) line endings.

            == Package Features                ==

  org.eclipse.jgit/

    * Read loose and packed commits, trees, blobs, including
      deltafied objects.

    * Read objects from shared repositories

    * Write loose commits, trees, blobs.

    * Write blobs from local files or Java InputStreams.

    * Read blobs as Java InputStreams.

    * Copy trees to local directory, or local directory to a tree.

    * Lazily loads objects as necessary.

    * Read and write .git/config files.

    * Create a new repository.

    * Read and write refs, including walking through symrefs.

    * Read, update and write the Git index.

    * Checkout in dirty working directory if trivial.

    * Walk the history from a given set of commits looking for commits
      introducing changes in files under a specified path.

    * Object transport
      Fetch via ssh, git, http, Amazon S3 and bundles.
      Push via ssh, git and Amazon S3. JGit does not yet deltify
      the pushed packs so they may be a lot larger than C Git packs.

  org.eclipse.jgit.pgm/

    * Assorted set of command line utilities. Mostly for ad-hoc testing of jgit
      log, glog, fetch etc.

            == Missing Features                ==

There are a lot of missing features. You need the real Git for this.
For some operations it may just be the preferred solution also. There
are not just a command line, there is e.g. git-gui that makes committing
partial files simple.

- Merging. 

- Repacking.

- Generate a GIT format patch.

- Apply a GIT format patch.

- Documentation. :-)

- gitattributes support
  In particular CRLF conversion is not implemented. Files are treated
  as byte sequences.

- submodule support
  Submodules are not supported or even recognized.

            == Support                         ==

  Post question, comments or patches to the git@vger.kernel.org mailing list.


            == Contributing                    ==

  See SUBMITTING_PATCHES in this directory. However, feedback and bug reports
  are also contributions.


            == About GIT                       ==

More information about GIT, its repository format, and the canonical
C based implementation can be obtained from the GIT websites:

  http://git.or.cz/
  http://www.kernel.org/pub/software/scm/git/
  http://www.kernel.org/pub/software/scm/git/docs/