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- /*
- * Copyright (C) 2008-2012, Google Inc.
- * Copyright (C) 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 static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
- import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
-
- import java.io.IOException;
- import java.text.MessageFormat;
- import java.time.Duration;
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashSet;
- import java.util.List;
- import java.util.concurrent.TimeoutException;
-
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.lib.RefUpdate.Result;
- import org.eclipse.jgit.revwalk.RevWalk;
- import org.eclipse.jgit.transport.PushCertificate;
- import org.eclipse.jgit.transport.ReceiveCommand;
- import org.eclipse.jgit.util.time.ProposedTimestamp;
-
- /**
- * Batch of reference updates to be applied to a repository.
- * <p>
- * The batch update is primarily useful in the transport code, where a client or
- * server is making changes to more than one reference at a time.
- */
- public class BatchRefUpdate {
- /**
- * Maximum delay the calling thread will tolerate while waiting for a
- * {@code MonotonicClock} to resolve associated {@link ProposedTimestamp}s.
- * <p>
- * A default of 5 seconds was chosen by guessing. A common assumption is
- * clock skew between machines on the same LAN using an NTP server also on
- * the same LAN should be under 5 seconds. 5 seconds is also not that long
- * for a large `git push` operation to complete.
- */
- private static final Duration MAX_WAIT = Duration.ofSeconds(5);
-
- private final RefDatabase refdb;
-
- /** Commands to apply during this batch. */
- private final List<ReceiveCommand> commands;
-
- /** Does the caller permit a forced update on a reference? */
- private boolean allowNonFastForwards;
-
- /** Identity to record action as within the reflog. */
- private PersonIdent refLogIdent;
-
- /** Message the caller wants included in the reflog. */
- private String refLogMessage;
-
- /** Should the result value be appended to {@link #refLogMessage}. */
- private boolean refLogIncludeResult;
-
- /** Push certificate associated with this update. */
- private PushCertificate pushCert;
-
- /** Whether updates should be atomic. */
- private boolean atomic;
-
- /** Push options associated with this update. */
- private List<String> pushOptions;
-
- /** Associated timestamps that should be blocked on before update. */
- private List<ProposedTimestamp> timestamps;
-
- /**
- * Initialize a new batch update.
- *
- * @param refdb
- * the reference database of the repository to be updated.
- */
- protected BatchRefUpdate(RefDatabase refdb) {
- this.refdb = refdb;
- this.commands = new ArrayList<ReceiveCommand>();
- this.atomic = refdb.performsAtomicTransactions();
- }
-
- /**
- * @return true if the batch update will permit a non-fast-forward update to
- * an existing reference.
- */
- public boolean isAllowNonFastForwards() {
- return allowNonFastForwards;
- }
-
- /**
- * Set if this update wants to permit a forced update.
- *
- * @param allow
- * true if this update batch should ignore merge tests.
- * @return {@code this}.
- */
- public BatchRefUpdate setAllowNonFastForwards(boolean allow) {
- allowNonFastForwards = allow;
- return this;
- }
-
- /** @return identity of the user making the change in the reflog. */
- public PersonIdent getRefLogIdent() {
- return refLogIdent;
- }
-
- /**
- * Set the identity of the user appearing in the reflog.
- * <p>
- * The timestamp portion of the identity is ignored. A new identity with the
- * current timestamp will be created automatically when the update occurs
- * and the log record is written.
- *
- * @param pi
- * identity of the user. If null the identity will be
- * automatically determined based on the repository
- * configuration.
- * @return {@code this}.
- */
- public BatchRefUpdate setRefLogIdent(final PersonIdent pi) {
- refLogIdent = pi;
- return this;
- }
-
- /**
- * Get the message to include in the reflog.
- *
- * @return message the caller wants to include in the reflog; null if the
- * update should not be logged.
- */
- public String getRefLogMessage() {
- return refLogMessage;
- }
-
- /** @return {@code true} if the ref log message should show the result. */
- public boolean isRefLogIncludingResult() {
- return refLogIncludeResult;
- }
-
- /**
- * Set the message to include in the reflog.
- *
- * @param msg
- * the message to describe this change. It may be null if
- * appendStatus is null in order not to append to the reflog
- * @param appendStatus
- * true if the status of the ref change (fast-forward or
- * forced-update) should be appended to the user supplied
- * message.
- * @return {@code this}.
- */
- public BatchRefUpdate setRefLogMessage(String msg, boolean appendStatus) {
- if (msg == null && !appendStatus)
- disableRefLog();
- else if (msg == null && appendStatus) {
- refLogMessage = ""; //$NON-NLS-1$
- refLogIncludeResult = true;
- } else {
- refLogMessage = msg;
- refLogIncludeResult = appendStatus;
- }
- return this;
- }
-
- /**
- * Don't record this update in the ref's associated reflog.
- *
- * @return {@code this}.
- */
- public BatchRefUpdate disableRefLog() {
- refLogMessage = null;
- refLogIncludeResult = false;
- return this;
- }
-
- /** @return true if log has been disabled by {@link #disableRefLog()}. */
- public boolean isRefLogDisabled() {
- return refLogMessage == null;
- }
-
- /**
- * Request that all updates in this batch be performed atomically.
- * <p>
- * When atomic updates are used, either all commands apply successfully, or
- * none do. Commands that might have otherwise succeeded are rejected with
- * {@code REJECTED_OTHER_REASON}.
- * <p>
- * This method only works if the underlying ref database supports atomic
- * transactions, i.e. {@link RefDatabase#performsAtomicTransactions()} returns
- * true. Calling this method with true if the underlying ref database does not
- * support atomic transactions will cause all commands to fail with {@code
- * REJECTED_OTHER_REASON}.
- *
- * @param atomic whether updates should be atomic.
- * @return {@code this}
- * @since 4.4
- */
- public BatchRefUpdate setAtomic(boolean atomic) {
- this.atomic = atomic;
- return this;
- }
-
- /**
- * @return atomic whether updates should be atomic.
- * @since 4.4
- */
- public boolean isAtomic() {
- return atomic;
- }
-
- /**
- * Set a push certificate associated with this update.
- * <p>
- * This usually includes commands to update the refs in this batch, but is not
- * required to.
- *
- * @param cert
- * push certificate, may be null.
- * @since 4.1
- */
- public void setPushCertificate(PushCertificate cert) {
- pushCert = cert;
- }
-
- /**
- * Set the push certificate associated with this update.
- * <p>
- * This usually includes commands to update the refs in this batch, but is not
- * required to.
- *
- * @return push certificate, may be null.
- * @since 4.1
- */
- protected PushCertificate getPushCertificate() {
- return pushCert;
- }
-
- /** @return commands this update will process. */
- public List<ReceiveCommand> getCommands() {
- return Collections.unmodifiableList(commands);
- }
-
- /**
- * Add a single command to this batch update.
- *
- * @param cmd
- * the command to add, must not be null.
- * @return {@code this}.
- */
- public BatchRefUpdate addCommand(ReceiveCommand cmd) {
- commands.add(cmd);
- return this;
- }
-
- /**
- * Add commands to this batch update.
- *
- * @param cmd
- * the commands to add, must not be null.
- * @return {@code this}.
- */
- public BatchRefUpdate addCommand(ReceiveCommand... cmd) {
- return addCommand(Arrays.asList(cmd));
- }
-
- /**
- * Add commands to this batch update.
- *
- * @param cmd
- * the commands to add, must not be null.
- * @return {@code this}.
- */
- public BatchRefUpdate addCommand(Collection<ReceiveCommand> cmd) {
- commands.addAll(cmd);
- return this;
- }
-
- /**
- * Gets the list of option strings associated with this update.
- *
- * @return pushOptions
- * @since 4.5
- */
- public List<String> getPushOptions() {
- return pushOptions;
- }
-
- /**
- * @return list of timestamps the batch must wait for.
- * @since 4.6
- */
- public List<ProposedTimestamp> getProposedTimestamps() {
- if (timestamps != null) {
- return Collections.unmodifiableList(timestamps);
- }
- return Collections.emptyList();
- }
-
- /**
- * Request the batch to wait for the affected timestamps to resolve.
- *
- * @param ts
- * @return {@code this}.
- * @since 4.6
- */
- public BatchRefUpdate addProposedTimestamp(ProposedTimestamp ts) {
- if (timestamps == null) {
- timestamps = new ArrayList<>(4);
- }
- timestamps.add(ts);
- return this;
- }
-
- /**
- * Execute this batch update.
- * <p>
- * The default implementation of this method performs a sequential reference
- * update over each reference.
- * <p>
- * Implementations must respect the atomicity requirements of the underlying
- * database as described in {@link #setAtomic(boolean)} and
- * {@link RefDatabase#performsAtomicTransactions()}.
- *
- * @param walk
- * a RevWalk to parse tags in case the storage system wants to
- * store them pre-peeled, a common performance optimization.
- * @param monitor
- * progress monitor to receive update status on.
- * @param options
- * a list of option strings; set null to execute without
- * @throws IOException
- * the database is unable to accept the update. Individual
- * command status must be tested to determine if there is a
- * partial failure, or a total failure.
- * @since 4.5
- */
- public void execute(RevWalk walk, ProgressMonitor monitor,
- List<String> options) throws IOException {
-
- if (atomic && !refdb.performsAtomicTransactions()) {
- for (ReceiveCommand c : commands) {
- if (c.getResult() == NOT_ATTEMPTED) {
- c.setResult(REJECTED_OTHER_REASON,
- JGitText.get().atomicRefUpdatesNotSupported);
- }
- }
- return;
- }
- if (!blockUntilTimestamps(MAX_WAIT)) {
- return;
- }
-
- if (options != null) {
- pushOptions = options;
- }
-
- monitor.beginTask(JGitText.get().updatingReferences, commands.size());
- List<ReceiveCommand> commands2 = new ArrayList<ReceiveCommand>(
- commands.size());
- // First delete refs. This may free the name space for some of the
- // updates.
- for (ReceiveCommand cmd : commands) {
- try {
- if (cmd.getResult() == NOT_ATTEMPTED) {
- cmd.updateType(walk);
- switch (cmd.getType()) {
- case CREATE:
- commands2.add(cmd);
- break;
- case UPDATE:
- case UPDATE_NONFASTFORWARD:
- commands2.add(cmd);
- break;
- case DELETE:
- RefUpdate rud = newUpdate(cmd);
- monitor.update(1);
- cmd.setResult(rud.delete(walk));
- }
- }
- } catch (IOException err) {
- cmd.setResult(
- REJECTED_OTHER_REASON,
- MessageFormat.format(JGitText.get().lockError,
- err.getMessage()));
- }
- }
- if (!commands2.isEmpty()) {
- // What part of the name space is already taken
- Collection<String> takenNames = new HashSet<String>(refdb.getRefs(
- RefDatabase.ALL).keySet());
- Collection<String> takenPrefixes = getTakenPrefixes(takenNames);
-
- // Now to the update that may require more room in the name space
- for (ReceiveCommand cmd : commands2) {
- try {
- if (cmd.getResult() == NOT_ATTEMPTED) {
- cmd.updateType(walk);
- RefUpdate ru = newUpdate(cmd);
- SWITCH: switch (cmd.getType()) {
- case DELETE:
- // Performed in the first phase
- break;
- case UPDATE:
- case UPDATE_NONFASTFORWARD:
- RefUpdate ruu = newUpdate(cmd);
- cmd.setResult(ruu.update(walk));
- break;
- case CREATE:
- for (String prefix : getPrefixes(cmd.getRefName())) {
- if (takenNames.contains(prefix)) {
- cmd.setResult(Result.LOCK_FAILURE);
- break SWITCH;
- }
- }
- if (takenPrefixes.contains(cmd.getRefName())) {
- cmd.setResult(Result.LOCK_FAILURE);
- break SWITCH;
- }
- ru.setCheckConflicting(false);
- addRefToPrefixes(takenPrefixes, cmd.getRefName());
- takenNames.add(cmd.getRefName());
- cmd.setResult(ru.update(walk));
- }
- }
- } catch (IOException err) {
- cmd.setResult(REJECTED_OTHER_REASON, MessageFormat.format(
- JGitText.get().lockError, err.getMessage()));
- } finally {
- monitor.update(1);
- }
- }
- }
- monitor.endTask();
- }
-
- /**
- * Wait for timestamps to be in the past, aborting commands on timeout.
- *
- * @param maxWait
- * maximum amount of time to wait for timestamps to resolve.
- * @return true if timestamps were successfully waited for; false if
- * commands were aborted.
- * @since 4.6
- */
- protected boolean blockUntilTimestamps(Duration maxWait) {
- if (timestamps == null) {
- return true;
- }
- try {
- ProposedTimestamp.blockUntil(timestamps, maxWait);
- return true;
- } catch (TimeoutException | InterruptedException e) {
- String msg = JGitText.get().timeIsUncertain;
- for (ReceiveCommand c : commands) {
- if (c.getResult() == NOT_ATTEMPTED) {
- c.setResult(REJECTED_OTHER_REASON, msg);
- }
- }
- return false;
- }
- }
-
- /**
- * Execute this batch update without option strings.
- *
- * @param walk
- * a RevWalk to parse tags in case the storage system wants to
- * store them pre-peeled, a common performance optimization.
- * @param monitor
- * progress monitor to receive update status on.
- * @throws IOException
- * the database is unable to accept the update. Individual
- * command status must be tested to determine if there is a
- * partial failure, or a total failure.
- */
- public void execute(RevWalk walk, ProgressMonitor monitor)
- throws IOException {
- execute(walk, monitor, null);
- }
-
- private static Collection<String> getTakenPrefixes(
- final Collection<String> names) {
- Collection<String> ref = new HashSet<String>();
- for (String name : names)
- ref.addAll(getPrefixes(name));
- return ref;
- }
-
- private static void addRefToPrefixes(Collection<String> prefixes,
- String name) {
- for (String prefix : getPrefixes(name)) {
- prefixes.add(prefix);
- }
- }
-
- static Collection<String> getPrefixes(String s) {
- Collection<String> ret = new HashSet<String>();
- int p1 = s.indexOf('/');
- while (p1 > 0) {
- ret.add(s.substring(0, p1));
- p1 = s.indexOf('/', p1 + 1);
- }
- return ret;
- }
-
- /**
- * Create a new RefUpdate copying the batch settings.
- *
- * @param cmd
- * specific command the update should be created to copy.
- * @return a single reference update command.
- * @throws IOException
- * the reference database cannot make a new update object for
- * the given reference.
- */
- protected RefUpdate newUpdate(ReceiveCommand cmd) throws IOException {
- RefUpdate ru = refdb.newUpdate(cmd.getRefName(), false);
- if (isRefLogDisabled())
- ru.disableRefLog();
- else {
- ru.setRefLogIdent(refLogIdent);
- ru.setRefLogMessage(refLogMessage, refLogIncludeResult);
- }
- ru.setPushCertificate(pushCert);
- switch (cmd.getType()) {
- case DELETE:
- if (!ObjectId.zeroId().equals(cmd.getOldId()))
- ru.setExpectedOldObjectId(cmd.getOldId());
- ru.setForceUpdate(true);
- return ru;
-
- case CREATE:
- case UPDATE:
- case UPDATE_NONFASTFORWARD:
- default:
- ru.setForceUpdate(isAllowNonFastForwards());
- ru.setExpectedOldObjectId(cmd.getOldId());
- ru.setNewObjectId(cmd.getNewId());
- return ru;
- }
- }
-
- @Override
- public String toString() {
- StringBuilder r = new StringBuilder();
- r.append(getClass().getSimpleName()).append('[');
- if (commands.isEmpty())
- return r.append(']').toString();
-
- r.append('\n');
- for (ReceiveCommand cmd : commands) {
- r.append(" "); //$NON-NLS-1$
- r.append(cmd);
- r.append(" (").append(cmd.getResult()); //$NON-NLS-1$
- if (cmd.getMessage() != null) {
- r.append(": ").append(cmd.getMessage()); //$NON-NLS-1$
- }
- r.append(")\n"); //$NON-NLS-1$
- }
- return r.append(']').toString();
- }
- }
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