When either --tags or a tag ref is explicitly specified on fetch, C Git
updates existing local tags if they are different.

Before this change, JGit returned REJECTED in such a case. Now it
updates it and returns FORCED.

Example:

    % mkdir a
    % cd a
    % git init -q
    % touch test.txt
    % git add test.txt
    % git commit -q -m 'Initial'
    % git tag v1
    % cd ..
    % git clone -q a b
    % cd a
    % echo Test > test.txt
    % git commit -q -a -m 'Second'
    % git tag -f v1
    Updated tag 'v1' (was bc85c08)
    % cd ../b
    % git fetch --tags
     - [tag update]      v1         -> v1

Bug: 388095
Change-Id: I5d5494c2ad1a2cdb8e9e614d3de445289734edfe

This corresponds to what C Git does, quoting from the fetch man page:

  This is done by first fetching from the remote using the given
  <refspec>s, and if the repository has objects that are pointed by
  remote tags that it does not yet have, then fetch those missing tags.

Before, JGit would also fetch tags that exist locally but point to a
different object, resulting in REJECTED results for these.

Also add some test cases to cover more cases.

Bug: 388095
Change-Id: Ib03d2d82e9c4b60179d626cfd5174be1da6388b2
Also-by: Stefan Lay <stefan.lay@sap.com>

Change-Id: Iedb54eb9d8396bc3ae66d8754c1527fd9ca655f9

Tags can be un-annotated whereby there is no RevTag object, only
a ref pointing to the tagged object.

Bug: 360650
Change-Id: I06309c45c0a896fe2a0a874700febf78c9fb87e8

Eclipse has some problem re-running single JUnit tests if
the tests are in Junit 3 format, but the JUnit 4 launcher
is used. This was quite unnecessary and the move was not
completed. We still have no JUnit4 test.

This completes the extermination of JUnit3. Most of the
work was global searce/replace using regular expression,
followed by numerous invocarions of quick-fix and organize
imports and verification that we had the same number of
tests before and after.

- Annotations were introduced.
- All references to JUnit3 classes removed
- Half-good replacement for getting the test name. This was
  needed to make the TestRngs work. The initialization of
  TestRngs was also made lazily since we can not longer find
  out the test name in runtime in the @Before methods.
- Renamed test classes to end with Test, with the exception
  of TestTranslateBundle, which fails from Maven
- Moved JGitTestUtil to the junit support bundle

Change-Id: Iddcd3da6ca927a7be773a9c63ebf8bb2147e2d13
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

When the Config is changed, it should be saved back to its local
file.  This ensure that a future call to getConfig() won't wipe
out the edits that were just made.

Change-Id: Id46d3f85d1c9b377f63ef861b72824e1aa060eee
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Adds API for performing git fetch operations.

Change-Id: Idd95664fd4e3bca03211e4ffda3e354849f92a35
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

Clients can request smart fetch support by examining the info/refs URL
with the service parameter set to the magic git-upload-pack string:

  GET /$GIT_DIR/info/refs?service=git-upload-pack HTTP/1.1

The response is formatted with the upload pack capabilities, using
the standard packet line formatter.  A special header line is put
in front of the standard upload-pack advertisement to let clients
know the service was recognized and is supported.

If the requested service is disabled an authorization status code is
returned, allowing the user agent to retry once they have obtained
credentials from a human, in case authentication is required by
the configured UploadPackFactory implementation.

Change-Id: Ib0f1a458c88b4b5509b0f882f55f83f5752bc57a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

This is a simple HTTP server that provides the minimum server side
support required for dumb (non-git aware) transport clients.

We produce the info/refs and objects/info/packs file on the fly
from the local repository state, but otherwise serve data as raw
files from the on-disk structure.

In the future we could better optimize the FileSender class and the
servlets that use it to take advantage of direct file to network
APIs in more advanced servlet containers like Jetty.

Our glue package borrows the idea of a micro embedded DSL from
Google Guice and uses it to configure a collection of Filters
and HttpServlets, all of which are matched against requests using
regular expressions.  If a subgroup exists in the pattern, it is
extracted and used for the path info component of the request.

Change-Id: Ia0f1a425d07d035e344ae54faf8aeb04763e7487
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Per CQ 3448 this is the initial contribution of the JGit project
to eclipse.org.  It is derived from the historical JGit repository
at commit 3a2dd9921c.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>