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This tool scans all references in the repository and writes out a new reference pointing to a single commit whose root tree is a RefTree containing the current refs of this repository. It alway skips storing the reference it will write to, avoiding the obvious cycle. Change-Id: I20b1eeb81c55dc49dd600eac3bf8f90297394113stable-4.3
Shawn Pearce
9 years ago
4 changed files with 134 additions and 0 deletions
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/* |
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* Copyright (C) 2015, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.pgm.debug; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.Map; |
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import org.eclipse.jgit.internal.storage.reftree.RefTree; |
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import org.eclipse.jgit.lib.CommitBuilder; |
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import org.eclipse.jgit.lib.ObjectId; |
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import org.eclipse.jgit.lib.ObjectInserter; |
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import org.eclipse.jgit.lib.ObjectReader; |
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import org.eclipse.jgit.lib.PersonIdent; |
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import org.eclipse.jgit.lib.Ref; |
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import org.eclipse.jgit.lib.RefDatabase; |
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import org.eclipse.jgit.lib.RefUpdate; |
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import org.eclipse.jgit.pgm.Command; |
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import org.eclipse.jgit.pgm.TextBuiltin; |
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import org.eclipse.jgit.revwalk.RevWalk; |
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import org.kohsuke.args4j.Argument; |
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@Command(usage = "usage_RebuildRefTree") |
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class RebuildRefTree extends TextBuiltin { |
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@Argument(index = 0, required = true, metaVar = "metaVar_ref", usage = "usage_updateRef") |
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String refName; |
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@Override |
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protected void run() throws Exception { |
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try (ObjectReader reader = db.newObjectReader(); |
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RevWalk rw = new RevWalk(reader); |
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ObjectInserter inserter = db.newObjectInserter()) { |
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RefDatabase refDb = db.getRefDatabase(); |
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CommitBuilder b = new CommitBuilder(); |
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Ref ref = db.getRefDatabase().exactRef(refName); |
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RefUpdate update = db.updateRef(refName); |
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ObjectId oldTreeId; |
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if (ref != null && ref.getObjectId() != null) { |
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ObjectId oldId = ref.getObjectId(); |
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update.setExpectedOldObjectId(oldId); |
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b.setParentId(oldId); |
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oldTreeId = rw.parseCommit(oldId).getTree(); |
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} else { |
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update.setExpectedOldObjectId(ObjectId.zeroId()); |
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oldTreeId = ObjectId.zeroId(); |
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} |
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RefTree tree = rebuild(refDb.getRefs(RefDatabase.ALL)); |
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b.setTreeId(tree.writeTree(inserter)); |
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b.setAuthor(new PersonIdent(db)); |
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b.setCommitter(b.getAuthor()); |
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if (b.getTreeId().equals(oldTreeId)) { |
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return; |
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} |
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update.setNewObjectId(inserter.insert(b)); |
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inserter.flush(); |
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RefUpdate.Result result = update.update(rw); |
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switch (result) { |
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case NEW: |
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case FAST_FORWARD: |
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break; |
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default: |
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throw die(String.format("%s: %s", update.getName(), result)); //$NON-NLS-1$
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} |
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} |
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} |
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private RefTree rebuild(Map<String, Ref> refMap) { |
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RefTree tree = RefTree.newEmptyTree(); |
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List<org.eclipse.jgit.internal.storage.reftree.Command> cmds |
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= new ArrayList<>(); |
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for (Ref r : refMap.values()) { |
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if (refName.equals(r.getName())) { |
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continue; |
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} |
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cmds.add(new org.eclipse.jgit.internal.storage.reftree.Command( |
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null, |
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db.peel(r))); |
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} |
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tree.apply(cmds); |
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return tree; |
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} |
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} |
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