Better report on client side if push failed due to too large object

JGits PushCommand and BasePackPushConnection were throwing a generic
exception when the pushed pack-file was rejected by the server since it
contained too large objects. Teach JGit to better analyze the server's
response to detect this situation and throw a more specific exception.

Detect this situation by parsing the status line sent by the server.
This change only recognizes the response sent by a JGit based server.
All other servers which report such problems in a different way still
lead to a generic TransportExceptions.

Also see https://git.eclipse.org/r/#/c/46348/

Change-Id: I8d6d65e4585ebb3846f7207e7d1a2f82fa9cbd86
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/PushCommand.java

@@ -55,6 +55,7 @@ import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.InvalidRemoteException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.errors.NotSupportedException;
+import org.eclipse.jgit.errors.TooLargeObjectInPackException;
 import org.eclipse.jgit.errors.TooLargePackException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
@@ -160,6 +161,9 @@ public class PushCommand extends
 				} catch (TooLargePackException e) {
 					throw new org.eclipse.jgit.api.errors.TooLargePackException(
 							e.getMessage(), e);
+				} catch (TooLargeObjectInPackException e) {
+					throw new org.eclipse.jgit.api.errors.TooLargeObjectInPackException(
+							e.getMessage(), e);
 				} catch (TransportException e) {
 					throw new org.eclipse.jgit.api.errors.TransportException(
 							e.getMessage(), e);

org.eclipse.jgit/src/org/eclipse/jgit/api/errors/TooLargeObjectInPackException.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2016, Matthias Sohn <matthias.sohn@sap.com> 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.api.errors;
+
+/**
+ * Exception thrown when the server rejected a too large pack
+ *
+ * @since 4.4
+ */
+public class TooLargeObjectInPackException extends TransportException {
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * @param msg
+	 *            message describing the transport failure.
+	 */
+	public TooLargeObjectInPackException(String msg) {
+		super(msg);
+	}
+
+	/**
+	 * @param msg
+	 *            message describing the transport exception.
+	 * @param cause
+	 *            why the transport failed.
+	 */
+	public TooLargeObjectInPackException(String msg, Throwable cause) {
+		super(msg, cause);
+	}
+}

org.eclipse.jgit/src/org/eclipse/jgit/errors/TooLargeObjectInPackException.java

@@ -43,13 +43,13 @@
 
 package org.eclipse.jgit.errors;
 
-import java.io.IOException;
 import java.text.MessageFormat;
 
 import org.eclipse.jgit.internal.JGitText;
+import org.eclipse.jgit.transport.URIish;
 
 /** Thrown when PackParser finds an object larger than a predefined limit */
-public class TooLargeObjectInPackException extends IOException {
+public class TooLargeObjectInPackException extends TransportException {
 	private static final long serialVersionUID = 1L;
 
 	/**
@@ -79,4 +79,17 @@ public class TooLargeObjectInPackException extends IOException {
 		super(MessageFormat.format(JGitText.get().receivePackObjectTooLarge2,
 				Long.valueOf(objectSize), Long.valueOf(maxObjectSizeLimit)));
 	}
+
+	/**
+	 * Construct a too large object in pack exception.
+	 *
+	 * @param uri
+	 *            URI used for transport
+	 * @param s
+	 *            message
+	 * @since 4.4
+	 */
+	public TooLargeObjectInPackException(URIish uri, String s) {
+		super(uri.setPass(null) + ": " + s); //$NON-NLS-1$
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackPushConnection.java

@@ -57,6 +57,7 @@ import java.util.Set;
 import org.eclipse.jgit.errors.NoRemoteRepositoryException;
 import org.eclipse.jgit.errors.NotSupportedException;
 import org.eclipse.jgit.errors.PackProtocolException;
+import org.eclipse.jgit.errors.TooLargeObjectInPackException;
 import org.eclipse.jgit.errors.TooLargePackException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
@@ -328,12 +329,16 @@ public abstract class BasePackPushConnection extends BasePackConnection implemen
 		if (!unpackLine.startsWith("unpack ")) //$NON-NLS-1$
 			throw new PackProtocolException(uri, MessageFormat.format(JGitText.get().unexpectedReportLine, unpackLine));
 		final String unpackStatus = unpackLine.substring("unpack ".length()); //$NON-NLS-1$
-		if (unpackStatus.startsWith("error Pack exceeds the limit of")) //$NON-NLS-1$
+		if (unpackStatus.startsWith("error Pack exceeds the limit of")) {//$NON-NLS-1$
 			throw new TooLargePackException(uri,
 					unpackStatus.substring("error ".length())); //$NON-NLS-1$
-		if (!unpackStatus.equals("ok")) //$NON-NLS-1$
+		} else if (unpackStatus.startsWith("error Object too large")) {//$NON-NLS-1$
+			throw new TooLargeObjectInPackException(uri,
+					unpackStatus.substring("error ".length())); //$NON-NLS-1$
+		} else if (!unpackStatus.equals("ok")) { //$NON-NLS-1$
 			throw new TransportException(uri, MessageFormat.format(
 					JGitText.get().errorOccurredDuringUnpackingOnTheRemoteEnd, unpackStatus));
+		}
 
 		String refLine;
 		while ((refLine = pckIn.readString()) != PacketLineIn.END) {