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- /*
- * Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
- * Copyright (C) 2008-2010, Google Inc.
- * Copyright (C) 2006-2010, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
- * 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.
- */
-
- package org.eclipse.jgit.lib;
-
- import java.io.BufferedOutputStream;
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.text.MessageFormat;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.HashSet;
- import java.util.LinkedList;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import java.util.concurrent.atomic.AtomicInteger;
-
- import org.eclipse.jgit.dircache.DirCache;
- import org.eclipse.jgit.errors.AmbiguousObjectException;
- import org.eclipse.jgit.errors.CorruptObjectException;
- import org.eclipse.jgit.errors.IncorrectObjectTypeException;
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.errors.NoWorkTreeException;
- import org.eclipse.jgit.errors.RevisionSyntaxException;
- import org.eclipse.jgit.events.IndexChangedEvent;
- import org.eclipse.jgit.events.IndexChangedListener;
- import org.eclipse.jgit.events.ListenerList;
- import org.eclipse.jgit.events.RepositoryEvent;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.revwalk.RevBlob;
- import org.eclipse.jgit.revwalk.RevCommit;
- import org.eclipse.jgit.revwalk.RevObject;
- import org.eclipse.jgit.revwalk.RevTree;
- import org.eclipse.jgit.revwalk.RevWalk;
- import org.eclipse.jgit.storage.file.ReflogEntry;
- import org.eclipse.jgit.storage.file.ReflogReader;
- import org.eclipse.jgit.treewalk.TreeWalk;
- import org.eclipse.jgit.util.FS;
- import org.eclipse.jgit.util.FileUtils;
- import org.eclipse.jgit.util.IO;
- import org.eclipse.jgit.util.RawParseUtils;
- import org.eclipse.jgit.util.io.SafeBufferedOutputStream;
-
- /**
- * Represents a Git repository.
- * <p>
- * A repository holds all objects and refs used for managing source code (could
- * be any type of file, but source code is what SCM's are typically used for).
- * <p>
- * This class is thread-safe.
- */
- public abstract class Repository {
- private static final ListenerList globalListeners = new ListenerList();
-
- /** @return the global listener list observing all events in this JVM. */
- public static ListenerList getGlobalListenerList() {
- return globalListeners;
- }
-
- private final AtomicInteger useCnt = new AtomicInteger(1);
-
- /** Metadata directory holding the repository's critical files. */
- private final File gitDir;
-
- /** File abstraction used to resolve paths. */
- private final FS fs;
-
- private final ListenerList myListeners = new ListenerList();
-
- /** If not bare, the top level directory of the working files. */
- private final File workTree;
-
- /** If not bare, the index file caching the working file states. */
- private final File indexFile;
-
- /**
- * Initialize a new repository instance.
- *
- * @param options
- * options to configure the repository.
- */
- protected Repository(final BaseRepositoryBuilder options) {
- gitDir = options.getGitDir();
- fs = options.getFS();
- workTree = options.getWorkTree();
- indexFile = options.getIndexFile();
- }
-
- /** @return listeners observing only events on this repository. */
- public ListenerList getListenerList() {
- return myListeners;
- }
-
- /**
- * Fire an event to all registered listeners.
- * <p>
- * The source repository of the event is automatically set to this
- * repository, before the event is delivered to any listeners.
- *
- * @param event
- * the event to deliver.
- */
- public void fireEvent(RepositoryEvent<?> event) {
- event.setRepository(this);
- myListeners.dispatch(event);
- globalListeners.dispatch(event);
- }
-
- /**
- * Create a new Git repository.
- * <p>
- * Repository with working tree is created using this method. This method is
- * the same as {@code create(false)}.
- *
- * @throws IOException
- * @see #create(boolean)
- */
- public void create() throws IOException {
- create(false);
- }
-
- /**
- * Create a new Git repository initializing the necessary files and
- * directories.
- *
- * @param bare
- * if true, a bare repository (a repository without a working
- * directory) is created.
- * @throws IOException
- * in case of IO problem
- */
- public abstract void create(boolean bare) throws IOException;
-
- /** @return local metadata directory; null if repository isn't local. */
- public File getDirectory() {
- return gitDir;
- }
-
- /**
- * @return the object database which stores this repository's data.
- */
- public abstract ObjectDatabase getObjectDatabase();
-
- /** @return a new inserter to create objects in {@link #getObjectDatabase()} */
- public ObjectInserter newObjectInserter() {
- return getObjectDatabase().newInserter();
- }
-
- /** @return a new reader to read objects from {@link #getObjectDatabase()} */
- public ObjectReader newObjectReader() {
- return getObjectDatabase().newReader();
- }
-
- /** @return the reference database which stores the reference namespace. */
- public abstract RefDatabase getRefDatabase();
-
- /**
- * @return the configuration of this repository
- */
- public abstract StoredConfig getConfig();
-
- /**
- * @return the used file system abstraction
- */
- public FS getFS() {
- return fs;
- }
-
- /**
- * @param objectId
- * @return true if the specified object is stored in this repo or any of the
- * known shared repositories.
- */
- public boolean hasObject(AnyObjectId objectId) {
- try {
- return getObjectDatabase().has(objectId);
- } catch (IOException e) {
- // Legacy API, assume error means "no"
- return false;
- }
- }
-
- /**
- * Open an object from this repository.
- * <p>
- * This is a one-shot call interface which may be faster than allocating a
- * {@link #newObjectReader()} to perform the lookup.
- *
- * @param objectId
- * identity of the object to open.
- * @return a {@link ObjectLoader} for accessing the object.
- * @throws MissingObjectException
- * the object does not exist.
- * @throws IOException
- * the object store cannot be accessed.
- */
- public ObjectLoader open(final AnyObjectId objectId)
- throws MissingObjectException, IOException {
- return getObjectDatabase().open(objectId);
- }
-
- /**
- * Open an object from this repository.
- * <p>
- * This is a one-shot call interface which may be faster than allocating a
- * {@link #newObjectReader()} to perform the lookup.
- *
- * @param objectId
- * identity of the object to open.
- * @param typeHint
- * hint about the type of object being requested;
- * {@link ObjectReader#OBJ_ANY} if the object type is not known,
- * or does not matter to the caller.
- * @return a {@link ObjectLoader} for accessing the object.
- * @throws MissingObjectException
- * the object does not exist.
- * @throws IncorrectObjectTypeException
- * typeHint was not OBJ_ANY, and the object's actual type does
- * not match typeHint.
- * @throws IOException
- * the object store cannot be accessed.
- */
- public ObjectLoader open(AnyObjectId objectId, int typeHint)
- throws MissingObjectException, IncorrectObjectTypeException,
- IOException {
- return getObjectDatabase().open(objectId, typeHint);
- }
-
- /**
- * Create a command to update, create or delete a ref in this repository.
- *
- * @param ref
- * name of the ref the caller wants to modify.
- * @return an update command. The caller must finish populating this command
- * and then invoke one of the update methods to actually make a
- * change.
- * @throws IOException
- * a symbolic ref was passed in and could not be resolved back
- * to the base ref, as the symbolic ref could not be read.
- */
- public RefUpdate updateRef(final String ref) throws IOException {
- return updateRef(ref, false);
- }
-
- /**
- * Create a command to update, create or delete a ref in this repository.
- *
- * @param ref
- * name of the ref the caller wants to modify.
- * @param detach
- * true to create a detached head
- * @return an update command. The caller must finish populating this command
- * and then invoke one of the update methods to actually make a
- * change.
- * @throws IOException
- * a symbolic ref was passed in and could not be resolved back
- * to the base ref, as the symbolic ref could not be read.
- */
- public RefUpdate updateRef(final String ref, final boolean detach) throws IOException {
- return getRefDatabase().newUpdate(ref, detach);
- }
-
- /**
- * Create a command to rename a ref in this repository
- *
- * @param fromRef
- * name of ref to rename from
- * @param toRef
- * name of ref to rename to
- * @return an update command that knows how to rename a branch to another.
- * @throws IOException
- * the rename could not be performed.
- *
- */
- public RefRename renameRef(final String fromRef, final String toRef) throws IOException {
- return getRefDatabase().newRename(fromRef, toRef);
- }
-
- /**
- * Parse a git revision string and return an object id.
- *
- * Combinations of these operators are supported:
- * <ul>
- * <li><b>HEAD</b>, <b>MERGE_HEAD</b>, <b>FETCH_HEAD</b></li>
- * <li><b>SHA-1</b>: a complete or abbreviated SHA-1</li>
- * <li><b>refs/...</b>: a complete reference name</li>
- * <li><b>short-name</b>: a short reference name under {@code refs/heads},
- * {@code refs/tags}, or {@code refs/remotes} namespace</li>
- * <li><b>tag-NN-gABBREV</b>: output from describe, parsed by treating
- * {@code ABBREV} as an abbreviated SHA-1.</li>
- * <li><i>id</i><b>^</b>: first parent of commit <i>id</i>, this is the same
- * as {@code id^1}</li>
- * <li><i>id</i><b>^0</b>: ensure <i>id</i> is a commit</li>
- * <li><i>id</i><b>^n</b>: n-th parent of commit <i>id</i></li>
- * <li><i>id</i><b>~n</b>: n-th historical ancestor of <i>id</i>, by first
- * parent. {@code id~3} is equivalent to {@code id^1^1^1} or {@code id^^^}.</li>
- * <li><i>id</i><b>:path</b>: Lookup path under tree named by <i>id</i></li>
- * <li><i>id</i><b>^{commit}</b>: ensure <i>id</i> is a commit</li>
- * <li><i>id</i><b>^{tree}</b>: ensure <i>id</i> is a tree</li>
- * <li><i>id</i><b>^{tag}</b>: ensure <i>id</i> is a tag</li>
- * <li><i>id</i><b>^{blob}</b>: ensure <i>id</i> is a blob</li>
- * </ul>
- *
- * <p>
- * The following operators are specified by Git conventions, but are not
- * supported by this method:
- * <ul>
- * <li><b>ref@{n}</b>: n-th version of ref as given by its reflog</li>
- * <li><b>ref@{time}</b>: value of ref at the designated time</li>
- * </ul>
- *
- * @param revstr
- * A git object references expression
- * @return an ObjectId or null if revstr can't be resolved to any ObjectId
- * @throws AmbiguousObjectException
- * {@code revstr} contains an abbreviated ObjectId and this
- * repository contains more than one object which match to the
- * input abbreviation.
- * @throws IncorrectObjectTypeException
- * the id parsed does not meet the type required to finish
- * applying the operators in the expression.
- * @throws RevisionSyntaxException
- * the expression is not supported by this implementation, or
- * does not meet the standard syntax.
- * @throws IOException
- * on serious errors
- */
- public ObjectId resolve(final String revstr)
- throws AmbiguousObjectException, IOException {
- RevWalk rw = new RevWalk(this);
- try {
- return resolve(rw, revstr);
- } finally {
- rw.release();
- }
- }
-
- private ObjectId resolve(final RevWalk rw, final String revstr) throws IOException {
- char[] rev = revstr.toCharArray();
- RevObject ref = null;
- for (int i = 0; i < rev.length; ++i) {
- switch (rev[i]) {
- case '^':
- if (ref == null) {
- ref = parseSimple(rw, new String(rev, 0, i));
- if (ref == null)
- return null;
- }
- if (i + 1 < rev.length) {
- switch (rev[i + 1]) {
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- int j;
- ref = rw.parseCommit(ref);
- for (j = i + 1; j < rev.length; ++j) {
- if (!Character.isDigit(rev[j]))
- break;
- }
- String parentnum = new String(rev, i + 1, j - i - 1);
- int pnum;
- try {
- pnum = Integer.parseInt(parentnum);
- } catch (NumberFormatException e) {
- throw new RevisionSyntaxException(
- JGitText.get().invalidCommitParentNumber,
- revstr);
- }
- if (pnum != 0) {
- RevCommit commit = (RevCommit) ref;
- if (pnum > commit.getParentCount())
- ref = null;
- else
- ref = commit.getParent(pnum - 1);
- }
- i = j - 1;
- break;
- case '{':
- int k;
- String item = null;
- for (k = i + 2; k < rev.length; ++k) {
- if (rev[k] == '}') {
- item = new String(rev, i + 2, k - i - 2);
- break;
- }
- }
- i = k;
- if (item != null)
- if (item.equals("tree")) {
- ref = rw.parseTree(ref);
- } else if (item.equals("commit")) {
- ref = rw.parseCommit(ref);
- } else if (item.equals("blob")) {
- ref = rw.peel(ref);
- if (!(ref instanceof RevBlob))
- throw new IncorrectObjectTypeException(ref,
- Constants.TYPE_BLOB);
- } else if (item.equals("")) {
- ref = rw.peel(ref);
- } else
- throw new RevisionSyntaxException(revstr);
- else
- throw new RevisionSyntaxException(revstr);
- break;
- default:
- ref = rw.parseAny(ref);
- if (ref instanceof RevCommit) {
- RevCommit commit = ((RevCommit) ref);
- if (commit.getParentCount() == 0)
- ref = null;
- else
- ref = commit.getParent(0);
- } else
- throw new IncorrectObjectTypeException(ref,
- Constants.TYPE_COMMIT);
-
- }
- } else {
- ref = rw.peel(ref);
- if (ref instanceof RevCommit) {
- RevCommit commit = ((RevCommit) ref);
- if (commit.getParentCount() == 0)
- ref = null;
- else
- ref = commit.getParent(0);
- } else
- throw new IncorrectObjectTypeException(ref,
- Constants.TYPE_COMMIT);
- }
- break;
- case '~':
- if (ref == null) {
- ref = parseSimple(rw, new String(rev, 0, i));
- if (ref == null)
- return null;
- }
- ref = rw.peel(ref);
- if (!(ref instanceof RevCommit))
- throw new IncorrectObjectTypeException(ref,
- Constants.TYPE_COMMIT);
- int l;
- for (l = i + 1; l < rev.length; ++l) {
- if (!Character.isDigit(rev[l]))
- break;
- }
- int dist;
- if (l - i > 1) {
- String distnum = new String(rev, i + 1, l - i - 1);
- try {
- dist = Integer.parseInt(distnum);
- } catch (NumberFormatException e) {
- throw new RevisionSyntaxException(
- JGitText.get().invalidAncestryLength, revstr);
- }
- } else
- dist = 1;
- while (dist > 0) {
- RevCommit commit = (RevCommit) ref;
- if (commit.getParentCount() == 0) {
- ref = null;
- break;
- }
- commit = commit.getParent(0);
- rw.parseHeaders(commit);
- ref = commit;
- --dist;
- }
- i = l - 1;
- break;
- case '@':
- int m;
- String time = null;
- for (m = i + 2; m < rev.length; ++m) {
- if (rev[m] == '}') {
- time = new String(rev, i + 2, m - i - 2);
- break;
- }
- }
- if (time != null) {
- String refName = new String(rev, 0, i);
- Ref resolved = getRefDatabase().getRef(refName);
- if (resolved == null)
- return null;
- ref = resolveReflog(rw, resolved, time);
- i = m;
- } else
- i = m - 1;
- break;
- case ':': {
- RevTree tree;
- if (ref == null) {
- // We might not yet have parsed the left hand side.
- ObjectId id;
- try {
- if (i == 0)
- id = resolve(rw, Constants.HEAD);
- else
- id = resolve(rw, new String(rev, 0, i));
- } catch (RevisionSyntaxException badSyntax) {
- throw new RevisionSyntaxException(revstr);
- }
- if (id == null)
- return null;
- tree = rw.parseTree(id);
- } else {
- tree = rw.parseTree(ref);
- }
-
- if (i == rev.length - 1)
- return tree.copy();
-
- TreeWalk tw = TreeWalk.forPath(rw.getObjectReader(),
- new String(rev, i + 1, rev.length - i - 1), tree);
- return tw != null ? tw.getObjectId(0) : null;
- }
-
- default:
- if (ref != null)
- throw new RevisionSyntaxException(revstr);
- }
- }
- return ref != null ? ref.copy() : resolveSimple(revstr);
- }
-
- private static boolean isHex(char c) {
- return ('0' <= c && c <= '9') //
- || ('a' <= c && c <= 'f') //
- || ('A' <= c && c <= 'F');
- }
-
- private static boolean isAllHex(String str, int ptr) {
- while (ptr < str.length()) {
- if (!isHex(str.charAt(ptr++)))
- return false;
- }
- return true;
- }
-
- private RevObject parseSimple(RevWalk rw, String revstr) throws IOException {
- ObjectId id = resolveSimple(revstr);
- return id != null ? rw.parseAny(id) : null;
- }
-
- private ObjectId resolveSimple(final String revstr) throws IOException {
- if (ObjectId.isId(revstr))
- return ObjectId.fromString(revstr);
-
- Ref r = getRefDatabase().getRef(revstr);
- if (r != null)
- return r.getObjectId();
-
- if (AbbreviatedObjectId.isId(revstr))
- return resolveAbbreviation(revstr);
-
- int dashg = revstr.indexOf("-g");
- if ((dashg + 5) < revstr.length() && 0 <= dashg
- && isHex(revstr.charAt(dashg + 2))
- && isHex(revstr.charAt(dashg + 3))
- && isAllHex(revstr, dashg + 4)) {
- // Possibly output from git describe?
- String s = revstr.substring(dashg + 2);
- if (AbbreviatedObjectId.isId(s))
- return resolveAbbreviation(s);
- }
-
- return null;
- }
-
- private RevCommit resolveReflog(RevWalk rw, Ref ref, String time)
- throws IOException {
- int number;
- try {
- number = Integer.parseInt(time);
- } catch (NumberFormatException nfe) {
- throw new RevisionSyntaxException(MessageFormat.format(
- JGitText.get().invalidReflogRevision, time));
- }
- if (number < 0)
- throw new RevisionSyntaxException(MessageFormat.format(
- JGitText.get().invalidReflogRevision, time));
-
- ReflogReader reader = new ReflogReader(this, ref.getName());
- ReflogEntry entry = reader.getReverseEntry(number);
- if (entry == null)
- throw new RevisionSyntaxException(MessageFormat.format(
- JGitText.get().reflogEntryNotFound,
- Integer.valueOf(number), ref.getName()));
-
- return rw.parseCommit(entry.getNewId());
- }
-
- private ObjectId resolveAbbreviation(final String revstr) throws IOException,
- AmbiguousObjectException {
- AbbreviatedObjectId id = AbbreviatedObjectId.fromString(revstr);
- ObjectReader reader = newObjectReader();
- try {
- Collection<ObjectId> matches = reader.resolve(id);
- if (matches.size() == 0)
- return null;
- else if (matches.size() == 1)
- return matches.iterator().next();
- else
- throw new AmbiguousObjectException(id, matches);
- } finally {
- reader.release();
- }
- }
-
- /** Increment the use counter by one, requiring a matched {@link #close()}. */
- public void incrementOpen() {
- useCnt.incrementAndGet();
- }
-
- /** Decrement the use count, and maybe close resources. */
- public void close() {
- if (useCnt.decrementAndGet() == 0) {
- doClose();
- }
- }
-
- /**
- * Invoked when the use count drops to zero during {@link #close()}.
- * <p>
- * The default implementation closes the object and ref databases.
- */
- protected void doClose() {
- getObjectDatabase().close();
- getRefDatabase().close();
- }
-
- public String toString() {
- String desc;
- if (getDirectory() != null)
- desc = getDirectory().getPath();
- else
- desc = getClass().getSimpleName() + "-"
- + System.identityHashCode(this);
- return "Repository[" + desc + "]";
- }
-
- /**
- * Get the name of the reference that {@code HEAD} points to.
- * <p>
- * This is essentially the same as doing:
- *
- * <pre>
- * return getRef(Constants.HEAD).getTarget().getName()
- * </pre>
- *
- * Except when HEAD is detached, in which case this method returns the
- * current ObjectId in hexadecimal string format.
- *
- * @return name of current branch (for example {@code refs/heads/master}) or
- * an ObjectId in hex format if the current branch is detached.
- * @throws IOException
- */
- public String getFullBranch() throws IOException {
- Ref head = getRef(Constants.HEAD);
- if (head == null)
- return null;
- if (head.isSymbolic())
- return head.getTarget().getName();
- if (head.getObjectId() != null)
- return head.getObjectId().name();
- return null;
- }
-
- /**
- * Get the short name of the current branch that {@code HEAD} points to.
- * <p>
- * This is essentially the same as {@link #getFullBranch()}, except the
- * leading prefix {@code refs/heads/} is removed from the reference before
- * it is returned to the caller.
- *
- * @return name of current branch (for example {@code master}), or an
- * ObjectId in hex format if the current branch is detached.
- * @throws IOException
- */
- public String getBranch() throws IOException {
- String name = getFullBranch();
- if (name != null)
- return shortenRefName(name);
- return name;
- }
-
- /**
- * Objects known to exist but not expressed by {@link #getAllRefs()}.
- * <p>
- * When a repository borrows objects from another repository, it can
- * advertise that it safely has that other repository's references, without
- * exposing any other details about the other repository. This may help
- * a client trying to push changes avoid pushing more than it needs to.
- *
- * @return unmodifiable collection of other known objects.
- */
- public Set<ObjectId> getAdditionalHaves() {
- return Collections.emptySet();
- }
-
- /**
- * Get a ref by name.
- *
- * @param name
- * the name of the ref to lookup. May be a short-hand form, e.g.
- * "master" which is is automatically expanded to
- * "refs/heads/master" if "refs/heads/master" already exists.
- * @return the Ref with the given name, or null if it does not exist
- * @throws IOException
- */
- public Ref getRef(final String name) throws IOException {
- return getRefDatabase().getRef(name);
- }
-
- /**
- * @return mutable map of all known refs (heads, tags, remotes).
- */
- public Map<String, Ref> getAllRefs() {
- try {
- return getRefDatabase().getRefs(RefDatabase.ALL);
- } catch (IOException e) {
- return new HashMap<String, Ref>();
- }
- }
-
- /**
- * @return mutable map of all tags; key is short tag name ("v1.0") and value
- * of the entry contains the ref with the full tag name
- * ("refs/tags/v1.0").
- */
- public Map<String, Ref> getTags() {
- try {
- return getRefDatabase().getRefs(Constants.R_TAGS);
- } catch (IOException e) {
- return new HashMap<String, Ref>();
- }
- }
-
- /**
- * Peel a possibly unpeeled reference to an annotated tag.
- * <p>
- * If the ref cannot be peeled (as it does not refer to an annotated tag)
- * the peeled id stays null, but {@link Ref#isPeeled()} will be true.
- *
- * @param ref
- * The ref to peel
- * @return <code>ref</code> if <code>ref.isPeeled()</code> is true; else a
- * new Ref object representing the same data as Ref, but isPeeled()
- * will be true and getPeeledObjectId will contain the peeled object
- * (or null).
- */
- public Ref peel(final Ref ref) {
- try {
- return getRefDatabase().peel(ref);
- } catch (IOException e) {
- // Historical accident; if the reference cannot be peeled due
- // to some sort of repository access problem we claim that the
- // same as if the reference was not an annotated tag.
- return ref;
- }
- }
-
- /**
- * @return a map with all objects referenced by a peeled ref.
- */
- public Map<AnyObjectId, Set<Ref>> getAllRefsByPeeledObjectId() {
- Map<String, Ref> allRefs = getAllRefs();
- Map<AnyObjectId, Set<Ref>> ret = new HashMap<AnyObjectId, Set<Ref>>(allRefs.size());
- for (Ref ref : allRefs.values()) {
- ref = peel(ref);
- AnyObjectId target = ref.getPeeledObjectId();
- if (target == null)
- target = ref.getObjectId();
- // We assume most Sets here are singletons
- Set<Ref> oset = ret.put(target, Collections.singleton(ref));
- if (oset != null) {
- // that was not the case (rare)
- if (oset.size() == 1) {
- // Was a read-only singleton, we must copy to a new Set
- oset = new HashSet<Ref>(oset);
- }
- ret.put(target, oset);
- oset.add(ref);
- }
- }
- return ret;
- }
-
- /**
- * @return the index file location
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- */
- public File getIndexFile() throws NoWorkTreeException {
- if (isBare())
- throw new NoWorkTreeException();
- return indexFile;
- }
-
- /**
- * Create a new in-core index representation and read an index from disk.
- * <p>
- * The new index will be read before it is returned to the caller. Read
- * failures are reported as exceptions and therefore prevent the method from
- * returning a partially populated index.
- *
- * @return a cache representing the contents of the specified index file (if
- * it exists) or an empty cache if the file does not exist.
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- * @throws IOException
- * the index file is present but could not be read.
- * @throws CorruptObjectException
- * the index file is using a format or extension that this
- * library does not support.
- */
- public DirCache readDirCache() throws NoWorkTreeException,
- CorruptObjectException, IOException {
- return DirCache.read(this);
- }
-
- /**
- * Create a new in-core index representation, lock it, and read from disk.
- * <p>
- * The new index will be locked and then read before it is returned to the
- * caller. Read failures are reported as exceptions and therefore prevent
- * the method from returning a partially populated index.
- *
- * @return a cache representing the contents of the specified index file (if
- * it exists) or an empty cache if the file does not exist.
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- * @throws IOException
- * the index file is present but could not be read, or the lock
- * could not be obtained.
- * @throws CorruptObjectException
- * the index file is using a format or extension that this
- * library does not support.
- */
- public DirCache lockDirCache() throws NoWorkTreeException,
- CorruptObjectException, IOException {
- // we want DirCache to inform us so that we can inform registered
- // listeners about index changes
- IndexChangedListener l = new IndexChangedListener() {
-
- public void onIndexChanged(IndexChangedEvent event) {
- notifyIndexChanged();
- }
- };
- return DirCache.lock(this, l);
- }
-
- static byte[] gitInternalSlash(byte[] bytes) {
- if (File.separatorChar == '/')
- return bytes;
- for (int i=0; i<bytes.length; ++i)
- if (bytes[i] == File.separatorChar)
- bytes[i] = '/';
- return bytes;
- }
-
- /**
- * @return an important state
- */
- public RepositoryState getRepositoryState() {
- if (isBare() || getDirectory() == null)
- return RepositoryState.BARE;
-
- // Pre Git-1.6 logic
- if (new File(getWorkTree(), ".dotest").exists())
- return RepositoryState.REBASING;
- if (new File(getDirectory(), ".dotest-merge").exists())
- return RepositoryState.REBASING_INTERACTIVE;
-
- // From 1.6 onwards
- if (new File(getDirectory(),"rebase-apply/rebasing").exists())
- return RepositoryState.REBASING_REBASING;
- if (new File(getDirectory(),"rebase-apply/applying").exists())
- return RepositoryState.APPLY;
- if (new File(getDirectory(),"rebase-apply").exists())
- return RepositoryState.REBASING;
-
- if (new File(getDirectory(),"rebase-merge/interactive").exists())
- return RepositoryState.REBASING_INTERACTIVE;
- if (new File(getDirectory(),"rebase-merge").exists())
- return RepositoryState.REBASING_MERGE;
-
- // Both versions
- if (new File(getDirectory(), Constants.MERGE_HEAD).exists()) {
- // we are merging - now check whether we have unmerged paths
- try {
- if (!readDirCache().hasUnmergedPaths()) {
- // no unmerged paths -> return the MERGING_RESOLVED state
- return RepositoryState.MERGING_RESOLVED;
- }
- } catch (IOException e) {
- // Can't decide whether unmerged paths exists. Return
- // MERGING state to be on the safe side (in state MERGING
- // you are not allow to do anything)
- }
- return RepositoryState.MERGING;
- }
-
- if (new File(getDirectory(), "BISECT_LOG").exists())
- return RepositoryState.BISECTING;
-
- if (new File(getDirectory(), Constants.CHERRY_PICK_HEAD).exists()) {
- try {
- if (!readDirCache().hasUnmergedPaths()) {
- // no unmerged paths
- return RepositoryState.CHERRY_PICKING_RESOLVED;
- }
- } catch (IOException e) {
- // fall through to CHERRY_PICKING
- }
-
- return RepositoryState.CHERRY_PICKING;
- }
-
- return RepositoryState.SAFE;
- }
-
- /**
- * Check validity of a ref name. It must not contain character that has
- * a special meaning in a Git object reference expression. Some other
- * dangerous characters are also excluded.
- *
- * For portability reasons '\' is excluded
- *
- * @param refName
- *
- * @return true if refName is a valid ref name
- */
- public static boolean isValidRefName(final String refName) {
- final int len = refName.length();
- if (len == 0)
- return false;
- if (refName.endsWith(".lock"))
- return false;
-
- int components = 1;
- char p = '\0';
- for (int i = 0; i < len; i++) {
- final char c = refName.charAt(i);
- if (c <= ' ')
- return false;
- switch (c) {
- case '.':
- switch (p) {
- case '\0': case '/': case '.':
- return false;
- }
- if (i == len -1)
- return false;
- break;
- case '/':
- if (i == 0 || i == len - 1)
- return false;
- components++;
- break;
- case '{':
- if (p == '@')
- return false;
- break;
- case '~': case '^': case ':':
- case '?': case '[': case '*':
- case '\\':
- return false;
- }
- p = c;
- }
- return components > 1;
- }
-
- /**
- * Strip work dir and return normalized repository path.
- *
- * @param workDir Work dir
- * @param file File whose path shall be stripped of its workdir
- * @return normalized repository relative path or the empty
- * string if the file is not relative to the work directory.
- */
- public static String stripWorkDir(File workDir, File file) {
- final String filePath = file.getPath();
- final String workDirPath = workDir.getPath();
-
- if (filePath.length() <= workDirPath.length() ||
- filePath.charAt(workDirPath.length()) != File.separatorChar ||
- !filePath.startsWith(workDirPath)) {
- File absWd = workDir.isAbsolute() ? workDir : workDir.getAbsoluteFile();
- File absFile = file.isAbsolute() ? file : file.getAbsoluteFile();
- if (absWd == workDir && absFile == file)
- return "";
- return stripWorkDir(absWd, absFile);
- }
-
- String relName = filePath.substring(workDirPath.length() + 1);
- if (File.separatorChar != '/')
- relName = relName.replace(File.separatorChar, '/');
- return relName;
- }
-
- /**
- * @return true if this is bare, which implies it has no working directory.
- */
- public boolean isBare() {
- return workTree == null;
- }
-
- /**
- * @return the root directory of the working tree, where files are checked
- * out for viewing and editing.
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- */
- public File getWorkTree() throws NoWorkTreeException {
- if (isBare())
- throw new NoWorkTreeException();
- return workTree;
- }
-
- /**
- * Force a scan for changed refs.
- *
- * @throws IOException
- */
- public abstract void scanForRepoChanges() throws IOException;
-
- /**
- * Notify that the index changed
- */
- public abstract void notifyIndexChanged();
-
- /**
- * @param refName
- *
- * @return a more user friendly ref name
- */
- public static String shortenRefName(String refName) {
- if (refName.startsWith(Constants.R_HEADS))
- return refName.substring(Constants.R_HEADS.length());
- if (refName.startsWith(Constants.R_TAGS))
- return refName.substring(Constants.R_TAGS.length());
- if (refName.startsWith(Constants.R_REMOTES))
- return refName.substring(Constants.R_REMOTES.length());
- return refName;
- }
-
- /**
- * @param refName
- * @return a {@link ReflogReader} for the supplied refname, or null if the
- * named ref does not exist.
- * @throws IOException the ref could not be accessed.
- */
- public abstract ReflogReader getReflogReader(String refName)
- throws IOException;
-
- /**
- * Return the information stored in the file $GIT_DIR/MERGE_MSG. In this
- * file operations triggering a merge will store a template for the commit
- * message of the merge commit.
- *
- * @return a String containing the content of the MERGE_MSG file or
- * {@code null} if this file doesn't exist
- * @throws IOException
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- */
- public String readMergeCommitMsg() throws IOException, NoWorkTreeException {
- if (isBare() || getDirectory() == null)
- throw new NoWorkTreeException();
-
- File mergeMsgFile = new File(getDirectory(), Constants.MERGE_MSG);
- try {
- return RawParseUtils.decode(IO.readFully(mergeMsgFile));
- } catch (FileNotFoundException e) {
- // MERGE_MSG file has disappeared in the meantime
- // ignore it
- return null;
- }
- }
-
- /**
- * Write new content to the file $GIT_DIR/MERGE_MSG. In this file operations
- * triggering a merge will store a template for the commit message of the
- * merge commit. If <code>null</code> is specified as message the file will
- * be deleted
- *
- * @param msg
- * the message which should be written or <code>null</code> to
- * delete the file
- *
- * @throws IOException
- */
- public void writeMergeCommitMsg(String msg) throws IOException {
- File mergeMsgFile = new File(gitDir, Constants.MERGE_MSG);
- if (msg != null) {
- FileOutputStream fos = new FileOutputStream(mergeMsgFile);
- try {
- fos.write(msg.getBytes(Constants.CHARACTER_ENCODING));
- } finally {
- fos.close();
- }
- } else {
- FileUtils.delete(mergeMsgFile, FileUtils.SKIP_MISSING);
- }
- }
-
- /**
- * Return the information stored in the file $GIT_DIR/MERGE_HEAD. In this
- * file operations triggering a merge will store the IDs of all heads which
- * should be merged together with HEAD.
- *
- * @return a list of commits which IDs are listed in the MERGE_HEAD
- * file or {@code null} if this file doesn't exist. Also if the file
- * exists but is empty {@code null} will be returned
- * @throws IOException
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- */
- public List<ObjectId> readMergeHeads() throws IOException, NoWorkTreeException {
- if (isBare() || getDirectory() == null)
- throw new NoWorkTreeException();
-
- byte[] raw = readGitDirectoryFile(Constants.MERGE_HEAD);
- if (raw == null)
- return null;
-
- LinkedList<ObjectId> heads = new LinkedList<ObjectId>();
- for (int p = 0; p < raw.length;) {
- heads.add(ObjectId.fromString(raw, p));
- p = RawParseUtils
- .nextLF(raw, p + Constants.OBJECT_ID_STRING_LENGTH);
- }
- return heads;
- }
-
- /**
- * Write new merge-heads into $GIT_DIR/MERGE_HEAD. In this file operations
- * triggering a merge will store the IDs of all heads which should be merged
- * together with HEAD. If <code>null</code> is specified as list of commits
- * the file will be deleted
- *
- * @param heads
- * a list of commits which IDs should be written to
- * $GIT_DIR/MERGE_HEAD or <code>null</code> to delete the file
- * @throws IOException
- */
- public void writeMergeHeads(List<ObjectId> heads) throws IOException {
- writeHeadsFile(heads, Constants.MERGE_HEAD);
- }
-
- /**
- * Return the information stored in the file $GIT_DIR/CHERRY_PICK_HEAD.
- *
- * @return object id from CHERRY_PICK_HEAD file or {@code null} if this file
- * doesn't exist. Also if the file exists but is empty {@code null}
- * will be returned
- * @throws IOException
- * @throws NoWorkTreeException
- * if this is bare, which implies it has no working directory.
- * See {@link #isBare()}.
- */
- public ObjectId readCherryPickHead() throws IOException,
- NoWorkTreeException {
- if (isBare() || getDirectory() == null)
- throw new NoWorkTreeException();
-
- byte[] raw = readGitDirectoryFile(Constants.CHERRY_PICK_HEAD);
- if (raw == null)
- return null;
-
- return ObjectId.fromString(raw, 0);
- }
-
- /**
- * Write cherry pick commit into $GIT_DIR/CHERRY_PICK_HEAD. This is used in
- * case of conflicts to store the cherry which was tried to be picked.
- *
- * @param head
- * an object id of the cherry commit or <code>null</code> to
- * delete the file
- * @throws IOException
- */
- public void writeCherryPickHead(ObjectId head) throws IOException {
- List<ObjectId> heads = (head != null) ? Collections.singletonList(head)
- : null;
- writeHeadsFile(heads, Constants.CHERRY_PICK_HEAD);
- }
-
- /**
- * Read a file from the git directory.
- *
- * @param filename
- * @return the raw contents or null if the file doesn't exist or is empty
- * @throws IOException
- */
- private byte[] readGitDirectoryFile(String filename) throws IOException {
- File file = new File(getDirectory(), filename);
- try {
- byte[] raw = IO.readFully(file);
- return raw.length > 0 ? raw : null;
- } catch (FileNotFoundException notFound) {
- return null;
- }
- }
-
- /**
- * Write the given heads to a file in the git directory.
- *
- * @param heads
- * a list of object ids to write or null if the file should be
- * deleted.
- * @param filename
- * @throws FileNotFoundException
- * @throws IOException
- */
- private void writeHeadsFile(List<ObjectId> heads, String filename)
- throws FileNotFoundException, IOException {
- File headsFile = new File(getDirectory(), filename);
- if (heads != null) {
- BufferedOutputStream bos = new SafeBufferedOutputStream(
- new FileOutputStream(headsFile));
- try {
- for (ObjectId id : heads) {
- id.copyTo(bos);
- bos.write('\n');
- }
- } finally {
- bos.close();
- }
- } else {
- FileUtils.delete(headsFile, FileUtils.SKIP_MISSING);
- }
- }
- }
|