Merge "push: support per-ref force-with-lease"

3 files changed, 213 insertions, 6 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/PushCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/PushCommand.java
index bd4521b517..be15ab13bd 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/PushCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/PushCommand.java
@@ -47,9 +47,12 @@ import java.io.OutputStream;
 import java.net.URISyntaxException;
 import java.text.MessageFormat;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.InvalidRemoteException;
@@ -65,6 +68,7 @@ import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.transport.PushResult;
+import org.eclipse.jgit.transport.RefLeaseSpec;
 import org.eclipse.jgit.transport.RefSpec;
 import org.eclipse.jgit.transport.RemoteConfig;
 import org.eclipse.jgit.transport.RemoteRefUpdate;
@@ -85,6 +89,8 @@ public class PushCommand extends
 
 	private final List<RefSpec> refSpecs;
 
+	private final Map<String, RefLeaseSpec> refLeaseSpecs;
+
 	private ProgressMonitor monitor = NullProgressMonitor.INSTANCE;
 
 	private String receivePack = RemoteConfig.DEFAULT_RECEIVE_PACK;
@@ -104,6 +110,7 @@ public class PushCommand extends
 	protected PushCommand(Repository repo) {
 		super(repo);
 		refSpecs = new ArrayList<RefSpec>(3);
+		refLeaseSpecs = new HashMap<>();
 	}
 
 	/**
@@ -155,7 +162,7 @@ public class PushCommand extends
 				configure(transport);
 
 				final Collection<RemoteRefUpdate> toPush = transport
-						.findRemoteRefUpdatesFor(refSpecs);
+						.findRemoteRefUpdatesFor(refSpecs, refLeaseSpecs);
 
 				try {
 					PushResult result = transport.push(monitor, toPush, out);
@@ -271,6 +278,43 @@ public class PushCommand extends
 	}
 
 	/**
+	 * @return the ref lease specs
+	 * @since 4.7
+	 */
+	public List<RefLeaseSpec> getRefLeaseSpecs() {
+		return new ArrayList<RefLeaseSpec>(refLeaseSpecs.values());
+	}
+
+	/**
+	 * The ref lease specs to be used in the push operation,
+	 * for a force-with-lease push operation.
+	 *
+	 * @param specs
+	 * @return {@code this}
+	 * @since 4.7
+	 */
+	public PushCommand setRefLeaseSpecs(RefLeaseSpec... specs) {
+		return setRefLeaseSpecs(Arrays.asList(specs));
+	}
+
+	/**
+	 * The ref lease specs to be used in the push operation,
+	 * for a force-with-lease push operation.
+	 *
+	 * @param specs
+	 * @return {@code this}
+	 * @since 4.7
+	 */
+	public PushCommand setRefLeaseSpecs(List<RefLeaseSpec> specs) {
+		checkCallable();
+		this.refLeaseSpecs.clear();
+		for (RefLeaseSpec spec : specs) {
+			refLeaseSpecs.put(spec.getRef(), spec);
+		}
+		return this;
+	}
+
+	/**
 	 * @return the ref specs
 	 */
 	public List<RefSpec> getRefSpecs() {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefLeaseSpec.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefLeaseSpec.java
new file mode 100644
index 0000000000..02c3c3cc55
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefLeaseSpec.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2017 Two Sigma Open Source
+ * 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.transport;
+
+import java.io.Serializable;
+
+import org.eclipse.jgit.internal.JGitText;
+
+/**
+ * Describes the expected value for a ref being pushed.
+ * @since 4.7
+ */
+public class RefLeaseSpec implements Serializable {
+	private static final long serialVersionUID = 1L;
+
+	/** Name of the ref whose value we want to check. */
+	private final String ref;
+
+	/** Local commitish to get expected value from. */
+	private final String expected;
+
+	private RefLeaseSpec(final RefLeaseSpec p) {
+		ref = p.getRef();
+		expected = p.getExpected();
+	}
+
+	public RefLeaseSpec(final String ref, final String expected) {
+		this.ref = ref;
+		this.expected = expected;
+	}
+
+	/**
+	 * Get the ref to protect.
+	 *
+	 * @return name of ref to check.
+	 */
+	public String getRef() {
+		return ref;
+	}
+
+	/**
+	 * Get the expected value of the ref, in the form
+	 * of a local committish
+	 *
+	 * @return expected ref value.
+	 */
+	public String getExpected() {
+		return expected;
+	}
+
+	public String toString() {
+		final StringBuilder r = new StringBuilder();
+		r.append(getRef());
+		r.append(':');
+		r.append(getExpected());
+		return r.toString();
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
index df860695df..64bdbe7d4a 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
@@ -80,6 +80,7 @@ import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectChecker;
+import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
@@ -603,14 +604,16 @@ public abstract class Transport implements AutoCloseable {
 	 * Convert push remote refs update specification from {@link RefSpec} form
 	 * to {@link RemoteRefUpdate}. Conversion expands wildcards by matching
 	 * source part to local refs. expectedOldObjectId in RemoteRefUpdate is
-	 * always set as null. Tracking branch is configured if RefSpec destination
-	 * matches source of any fetch ref spec for this transport remote
-	 * configuration.
+	 * set when specified in leases. Tracking branch is configured if RefSpec
+	 * destination matches source of any fetch ref spec for this transport
+	 * remote configuration.
 	 *
 	 * @param db
 	 *            local database.
 	 * @param specs
 	 *            collection of RefSpec to convert.
+	 * @param leases
+	 *            map from ref to lease (containing expected old object id)
 	 * @param fetchSpecs
 	 *            fetch specifications used for finding localtracking refs. May
 	 *            be null or empty collection.
@@ -618,9 +621,11 @@ public abstract class Transport implements AutoCloseable {
 	 * @throws IOException
 	 *             when problem occurred during conversion or specification set
 	 *             up: most probably, missing objects or refs.
+	 * @since 4.7
 	 */
 	public static Collection<RemoteRefUpdate> findRemoteRefUpdatesFor(
 			final Repository db, final Collection<RefSpec> specs,
+			final Map<String, RefLeaseSpec> leases,
 			Collection<RefSpec> fetchSpecs) throws IOException {
 		if (fetchSpecs == null)
 			fetchSpecs = Collections.emptyList();
@@ -652,13 +657,43 @@ public abstract class Transport implements AutoCloseable {
 
 			final boolean forceUpdate = spec.isForceUpdate();
 			final String localName = findTrackingRefName(destSpec, fetchSpecs);
+			final RefLeaseSpec leaseSpec = leases.get(destSpec);
+			final ObjectId expected = leaseSpec == null ? null :
+				db.resolve(leaseSpec.getExpected());
 			final RemoteRefUpdate rru = new RemoteRefUpdate(db, srcSpec,
-					destSpec, forceUpdate, localName, null);
+					destSpec, forceUpdate, localName, expected);
 			result.add(rru);
 		}
 		return result;
 	}
 
+	/**
+	 * Convert push remote refs update specification from {@link RefSpec} form
+	 * to {@link RemoteRefUpdate}. Conversion expands wildcards by matching
+	 * source part to local refs. expectedOldObjectId in RemoteRefUpdate is
+	 * always set as null. Tracking branch is configured if RefSpec destination
+	 * matches source of any fetch ref spec for this transport remote
+	 * configuration.
+	 *
+	 * @param db
+	 *            local database.
+	 * @param specs
+	 *            collection of RefSpec to convert.
+	 * @param fetchSpecs
+	 *            fetch specifications used for finding localtracking refs. May
+	 *            be null or empty collection.
+	 * @return collection of set up {@link RemoteRefUpdate}.
+	 * @throws IOException
+	 *             when problem occurred during conversion or specification set
+	 *             up: most probably, missing objects or refs.
+	 */
+	public static Collection<RemoteRefUpdate> findRemoteRefUpdatesFor(
+			final Repository db, final Collection<RefSpec> specs,
+			Collection<RefSpec> fetchSpecs) throws IOException {
+		return findRemoteRefUpdatesFor(db, specs, Collections.emptyMap(),
+					       fetchSpecs);
+	}
+
 	private static Collection<RefSpec> expandPushWildcardsFor(
 			final Repository db, final Collection<RefSpec> specs)
 			throws IOException {
@@ -1341,7 +1376,36 @@ public abstract class Transport implements AutoCloseable {
 	 */
 	public Collection<RemoteRefUpdate> findRemoteRefUpdatesFor(
 			final Collection<RefSpec> specs) throws IOException {
-		return findRemoteRefUpdatesFor(local, specs, fetch);
+		return findRemoteRefUpdatesFor(local, specs, Collections.emptyMap(),
+					       fetch);
+	}
+
+	/**
+	 * Convert push remote refs update specification from {@link RefSpec} form
+	 * to {@link RemoteRefUpdate}. Conversion expands wildcards by matching
+	 * source part to local refs. expectedOldObjectId in RemoteRefUpdate is
+	 * set according to leases. Tracking branch is configured if RefSpec destination
+	 * matches source of any fetch ref spec for this transport remote
+	 * configuration.
+	 * <p>
+	 * Conversion is performed for context of this transport (database, fetch
+	 * specifications).
+	 *
+	 * @param specs
+	 *            collection of RefSpec to convert.
+	 * @param leases
+	 *            map from ref to lease (containing expected old object id)
+	 * @return collection of set up {@link RemoteRefUpdate}.
+	 * @throws IOException
+	 *             when problem occurred during conversion or specification set
+	 *             up: most probably, missing objects or refs.
+	 * @since 4.7
+	 */
+	public Collection<RemoteRefUpdate> findRemoteRefUpdatesFor(
+			final Collection<RefSpec> specs,
+			final Map<String, RefLeaseSpec> leases) throws IOException {
+		return findRemoteRefUpdatesFor(local, specs, leases,
+					       fetch);
 	}
 
 	/**