Utility to graft old JGit history onto repository

This script can be executed by a developer to download and graft
on the old JGit history, from before we moved the project to the
eclipse.org namespace and the Eclipse Foundation servers.

Executing this script is only necessary if you need to run log or
blame past the migration boundary, and isn't always recommended when
it comes to pushing objects to a remote server.  As mentioned in the
script, it is best to use a specialized repository with this graft,
not your main work repository.

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

tools/graft-old-history.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+# Copyright (C) 2009, Google Inc.
+# and other copyright owners as documented in the project's IP log.
+#
+# This program and the accompanying materials are made available
+# under the terms of the Eclipse Distribution License v1.0 which
+# accompanies this distribution, is reproduced below, and is
+# available at http://www.eclipse.org/org/documents/edl-v10.php
+#
+# All rights reserved.
+#
+# 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 Eclipse Foundation, Inc. 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 THE COPYRIGHT OWNER OR
+# CONTRIBUTORS 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.
+
+
+
+URL=git://repo.or.cz/jgit.git
+PRE=3a2dd9921c8a08740a9e02c421469e5b1a9e47cb
+POST=1a6964c8274c50f0253db75f010d78ef0e739343
+
+GIT_DIR=$(git rev-parse --git-dir) &&
+grafts="$GIT_DIR/info/grafts" &&
+
+if grep $PRE "$grafts" >/dev/null 2>/dev/null
+then
+  echo 'Graft already installed; doing nothing.' >&2
+else
+  git remote add old-jgit "$URL" &&
+  git fetch old-jgit &&
+  echo $POST $PRE >>"$GIT_DIR/info/grafts" &&
+  echo 'Graft installed.' >&2
+fi