Merge changes from topic 'batch-ref-update-reflog'

* changes:
  BatchRefUpdate: Expand javadocs and add @Nullable
  PackedBatchRefUpdate: Write reflogs
  Extract constants for reflog entry message prefixes

5 files changed, 449 insertions, 10 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/BatchRefUpdateTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/BatchRefUpdateTest.java
index 06c47acf21..a51a910fb2 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/BatchRefUpdateTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/BatchRefUpdateTest.java
@@ -55,12 +55,14 @@ import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE;
 import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -71,12 +73,19 @@ import org.eclipse.jgit.junit.StrictWorkMonitor;
 import org.eclipse.jgit.junit.TestRepository;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.BatchRefUpdate;
+import org.eclipse.jgit.lib.CheckoutEntry;
+import org.eclipse.jgit.lib.ConfigConstants;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefDatabase;
+import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.ReflogEntry;
+import org.eclipse.jgit.lib.ReflogReader;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.transport.ReceiveCommand;
@@ -109,6 +118,12 @@ public class BatchRefUpdateTest extends LocalDiskRepositoryTestCase {
 		super.setUp();
 
 		diskRepo = createBareRepository();
+		StoredConfig cfg = diskRepo.getConfig();
+		cfg.load();
+		cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
+				ConfigConstants.CONFIG_KEY_LOGALLREFUPDATES, true);
+		cfg.save();
+
 		refdir = (RefDirectory) diskRepo.getRefDatabase();
 
 		repo = new TestRepository<>(diskRepo);
@@ -318,10 +333,231 @@ public class BatchRefUpdateTest extends LocalDiskRepositoryTestCase {
 		}
 	}
 
+	@Test
+	public void noRefLog() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		Map<String, ReflogEntry> oldLogs =
+				getLastReflogs("refs/heads/master", "refs/heads/branch");
+		assertEquals(Collections.singleton("refs/heads/master"), oldLogs.keySet());
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(zeroId(), B, "refs/heads/branch", CREATE));
+		execute(newBatchUpdate(cmds).setAllowNonFastForwards(true));
+
+		assertResults(cmds, OK, OK);
+		assertRefs(
+				"refs/heads/master", B,
+				"refs/heads/branch", B);
+		assertReflogUnchanged(oldLogs, "refs/heads/master");
+		assertReflogUnchanged(oldLogs, "refs/heads/branch");
+	}
+
+	@Test
+	public void reflogDefaultIdent() throws IOException {
+		writeRef("refs/heads/master", A);
+		writeRef("refs/heads/branch2", A);
+
+		Map<String, ReflogEntry> oldLogs = getLastReflogs(
+				"refs/heads/master", "refs/heads/branch1", "refs/heads/branch2");
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(zeroId(), B, "refs/heads/branch1", CREATE));
+		execute(
+				newBatchUpdate(cmds)
+						.setAllowNonFastForwards(true)
+						.setRefLogMessage("a reflog", false));
+
+		assertResults(cmds, OK, OK);
+		assertRefs(
+				"refs/heads/master", B,
+				"refs/heads/branch1", B,
+				"refs/heads/branch2", A);
+		assertReflogEquals(
+				reflog(A, B, new PersonIdent(diskRepo), "a reflog"),
+				getLastReflog("refs/heads/master"));
+		assertReflogEquals(
+				reflog(zeroId(), B, new PersonIdent(diskRepo), "a reflog"),
+				getLastReflog("refs/heads/branch1"));
+		assertReflogUnchanged(oldLogs, "refs/heads/branch2");
+	}
+
+	@Test
+	public void reflogAppendStatusNoMessage() throws IOException {
+		writeRef("refs/heads/master", A);
+		writeRef("refs/heads/branch1", B);
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(B, A, "refs/heads/branch1", UPDATE_NONFASTFORWARD),
+				new ReceiveCommand(zeroId(), A, "refs/heads/branch2", CREATE));
+		execute(
+				newBatchUpdate(cmds)
+						.setAllowNonFastForwards(true)
+						.setRefLogMessage(null, true));
+
+		assertResults(cmds, OK, OK, OK);
+		assertRefs(
+				"refs/heads/master", B,
+				"refs/heads/branch1", A,
+				"refs/heads/branch2", A);
+		assertReflogEquals(
+				// Always forced; setAllowNonFastForwards(true) bypasses the check.
+				reflog(A, B, new PersonIdent(diskRepo), "forced-update"),
+				getLastReflog("refs/heads/master"));
+		assertReflogEquals(
+				reflog(B, A, new PersonIdent(diskRepo), "forced-update"),
+				getLastReflog("refs/heads/branch1"));
+		assertReflogEquals(
+				reflog(zeroId(), A, new PersonIdent(diskRepo), "created"),
+				getLastReflog("refs/heads/branch2"));
+	}
+
+	@Test
+	public void reflogAppendStatusFastForward() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE));
+		execute(newBatchUpdate(cmds).setRefLogMessage(null, true));
+
+		assertResults(cmds, OK);
+		assertRefs("refs/heads/master", B);
+		assertReflogEquals(
+				reflog(A, B, new PersonIdent(diskRepo), "fast-forward"),
+				getLastReflog("refs/heads/master"));
+	}
+
+	@Test
+	public void reflogAppendStatusWithMessage() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(zeroId(), A, "refs/heads/branch", CREATE));
+		execute(newBatchUpdate(cmds).setRefLogMessage("a reflog", true));
+
+		assertResults(cmds, OK, OK);
+		assertRefs(
+				"refs/heads/master", B,
+				"refs/heads/branch", A);
+		assertReflogEquals(
+				reflog(A, B, new PersonIdent(diskRepo), "a reflog: fast-forward"),
+				getLastReflog("refs/heads/master"));
+		assertReflogEquals(
+				reflog(zeroId(), A, new PersonIdent(diskRepo), "a reflog: created"),
+				getLastReflog("refs/heads/branch"));
+	}
+
+	@Test
+	public void reflogCustomIdent() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(zeroId(), B, "refs/heads/branch", CREATE));
+		PersonIdent ident = new PersonIdent("A Reflog User", "reflog@example.com");
+		execute(
+				newBatchUpdate(cmds)
+						.setRefLogMessage("a reflog", false)
+						.setRefLogIdent(ident));
+
+		assertResults(cmds, OK, OK);
+		assertRefs(
+				"refs/heads/master", B,
+				"refs/heads/branch", B);
+		assertReflogEquals(
+				reflog(A, B, ident, "a reflog"),
+				getLastReflog("refs/heads/master"),
+				true);
+		assertReflogEquals(
+				reflog(zeroId(), B, ident, "a reflog"),
+				getLastReflog("refs/heads/branch"),
+				true);
+	}
+
+	@Test
+	public void reflogDelete() throws IOException {
+		writeRef("refs/heads/master", A);
+		writeRef("refs/heads/branch", A);
+		assertEquals(
+				2, getLastReflogs("refs/heads/master", "refs/heads/branch").size());
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, zeroId(), "refs/heads/master", DELETE),
+				new ReceiveCommand(A, B, "refs/heads/branch", UPDATE));
+		execute(newBatchUpdate(cmds).setRefLogMessage("a reflog", false));
+
+		assertResults(cmds, OK, OK);
+		assertRefs("refs/heads/branch", B);
+		assertNull(getLastReflog("refs/heads/master"));
+		assertReflogEquals(
+				reflog(A, B, new PersonIdent(diskRepo), "a reflog"),
+				getLastReflog("refs/heads/branch"));
+	}
+
+	@Test
+	public void reflogFileDirectoryConflict() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, zeroId(), "refs/heads/master", DELETE),
+				new ReceiveCommand(zeroId(), A, "refs/heads/master/x", CREATE));
+		execute(newBatchUpdate(cmds).setRefLogMessage("a reflog", false));
+
+		assertResults(cmds, OK, OK);
+		assertRefs("refs/heads/master/x", A);
+		assertNull(getLastReflog("refs/heads/master"));
+		assertReflogEquals(
+				reflog(zeroId(), A, new PersonIdent(diskRepo), "a reflog"),
+				getLastReflog("refs/heads/master/x"));
+	}
+
+	@Test
+	public void reflogOnLockFailure() throws IOException {
+		writeRef("refs/heads/master", A);
+
+		Map<String, ReflogEntry> oldLogs =
+				getLastReflogs("refs/heads/master", "refs/heads/branch");
+
+		List<ReceiveCommand> cmds = Arrays.asList(
+				new ReceiveCommand(A, B, "refs/heads/master", UPDATE),
+				new ReceiveCommand(A, B, "refs/heads/branch", UPDATE));
+		execute(newBatchUpdate(cmds).setRefLogMessage("a reflog", false));
+
+		if (atomic) {
+			assertResults(cmds, TRANSACTION_ABORTED, LOCK_FAILURE);
+			assertReflogUnchanged(oldLogs, "refs/heads/master");
+			assertReflogUnchanged(oldLogs, "refs/heads/branch");
+		} else {
+			assertResults(cmds, OK, LOCK_FAILURE);
+			assertReflogEquals(
+					reflog(A, B, new PersonIdent(diskRepo), "a reflog"),
+					getLastReflog("refs/heads/master"));
+			assertReflogUnchanged(oldLogs, "refs/heads/branch");
+		}
+	}
+
 	private void writeLooseRef(String name, AnyObjectId id) throws IOException {
 		write(new File(diskRepo.getDirectory(), name), id.name() + "\n");
 	}
 
+	private void writeRef(String name, AnyObjectId id) throws IOException {
+		RefUpdate u = diskRepo.updateRef(name);
+		u.setRefLogMessage(getClass().getSimpleName(), false);
+		u.setForceUpdate(true);
+		u.setNewObjectId(id);
+		RefUpdate.Result r = u.update();
+		switch (r) {
+			case NEW:
+			case FORCED:
+				return;
+			default:
+				throw new IOException("Got " + r + " while updating " + name);
+		}
+	}
+
 	private BatchRefUpdate newBatchUpdate(List<ReceiveCommand> cmds) {
 		BatchRefUpdate u = refdir.newBatchUpdate();
 		if (atomic) {
@@ -410,4 +646,84 @@ public class BatchRefUpdateTest extends LocalDiskRepositoryTestCase {
 					r.p.test(c));
 		}
 	}
+
+	private Map<String, ReflogEntry> getLastReflogs(String... names)
+			throws IOException {
+		Map<String, ReflogEntry> result = new LinkedHashMap<>();
+		for (String name : names) {
+			ReflogEntry e = getLastReflog(name);
+			if (e != null) {
+				result.put(name, e);
+			}
+		}
+		return result;
+	}
+
+	private ReflogEntry getLastReflog(String name) throws IOException {
+		ReflogReader r = diskRepo.getReflogReader(name);
+		if (r == null) {
+			return null;
+		}
+		return r.getLastEntry();
+	}
+
+	private void assertReflogUnchanged(
+			Map<String, ReflogEntry> old, String name) throws IOException {
+		assertReflogEquals(old.get(name), getLastReflog(name), true);
+	}
+
+	private static void assertReflogEquals(
+			ReflogEntry expected, ReflogEntry actual) {
+		assertReflogEquals(expected, actual, false);
+	}
+
+	private static void assertReflogEquals(
+			ReflogEntry expected, ReflogEntry actual, boolean strictTime) {
+		if (expected == null) {
+			assertNull(actual);
+			return;
+		}
+		assertNotNull(actual);
+		assertEquals(expected.getOldId(), actual.getOldId());
+		assertEquals(expected.getNewId(), actual.getNewId());
+		if (strictTime) {
+			assertEquals(expected.getWho(), actual.getWho());
+		} else {
+			assertEquals(expected.getWho().getName(), actual.getWho().getName());
+			assertEquals(
+					expected.getWho().getEmailAddress(),
+					actual.getWho().getEmailAddress());
+		}
+		assertEquals(expected.getComment(), actual.getComment());
+	}
+
+	private static ReflogEntry reflog(ObjectId oldId, ObjectId newId,
+			PersonIdent who, String comment) {
+		return new ReflogEntry() {
+			@Override
+			public ObjectId getOldId() {
+				return oldId;
+			}
+
+			@Override
+			public ObjectId getNewId() {
+				return newId;
+			}
+
+			@Override
+			public PersonIdent getWho() {
+				return who;
+			}
+
+			@Override
+			public String getComment() {
+				return comment;
+			}
+
+			@Override
+			public CheckoutEntry parseCheckout() {
+				throw new UnsupportedOperationException();
+			}
+		};
+	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackedBatchRefUpdate.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackedBatchRefUpdate.java
index 65f9ec42a6..90155cbacf 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackedBatchRefUpdate.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackedBatchRefUpdate.java
@@ -62,9 +62,11 @@ import org.eclipse.jgit.internal.storage.file.RefDirectory.PackedRefList;
 import org.eclipse.jgit.lib.BatchRefUpdate;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectIdRef;
+import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefDatabase;
+import org.eclipse.jgit.lib.ReflogEntry;
 import org.eclipse.jgit.revwalk.RevObject;
 import org.eclipse.jgit.revwalk.RevTag;
 import org.eclipse.jgit.revwalk.RevWalk;
@@ -188,6 +190,7 @@ class PackedBatchRefUpdate extends BatchRefUpdate {
 
 		refdb.fireRefsChanged();
 		pending.forEach(c -> c.setResult(ReceiveCommand.Result.OK));
+		writeReflog(pending);
 	}
 
 	private boolean checkConflictingNames(List<ReceiveCommand> commands)
@@ -345,6 +348,81 @@ class PackedBatchRefUpdate extends BatchRefUpdate {
 		return b.toRefList();
 	}
 
+	private void writeReflog(List<ReceiveCommand> commands) {
+		if (isRefLogDisabled()) {
+			return;
+		}
+
+		PersonIdent ident = getRefLogIdent();
+		if (ident == null) {
+			ident = new PersonIdent(refdb.getRepository());
+		}
+		ReflogWriter w = refdb.getLogWriter();
+		for (ReceiveCommand cmd : commands) {
+			// Assume any pending commands have already been executed atomically.
+			if (cmd.getResult() != ReceiveCommand.Result.OK) {
+				continue;
+			}
+			String name = cmd.getRefName();
+
+			if (cmd.getType() == ReceiveCommand.Type.DELETE) {
+				try {
+					RefDirectory.delete(w.logFor(name), RefDirectory.levelsIn(name));
+				} catch (IOException e) {
+					// Ignore failures, see below.
+				}
+				continue;
+			}
+
+			String msg = getRefLogMessage();
+			if (isRefLogIncludingResult()) {
+				String strResult = toResultString(cmd);
+				if (strResult != null) {
+					msg = msg.isEmpty()
+							? strResult : msg + ": " + strResult; //$NON-NLS-1$
+				}
+			}
+			try {
+				w.log(name, cmd.getOldId(), cmd.getNewId(), ident, msg);
+			} catch (IOException e) {
+				// Ignore failures, but continue attempting to write more reflogs.
+				//
+				// In this storage format, it is impossible to atomically write the
+				// reflog with the ref updates, so we have to choose between:
+				// a. Propagating this exception and claiming failure, even though the
+				//    actual ref updates succeeded.
+				// b. Ignoring failures writing the reflog, so we claim success if and
+				//    only if the ref updates succeeded.
+				// We choose (b) in order to surprise callers the least.
+				//
+				// Possible future improvements:
+				// * Log a warning to a logger.
+				// * Retry a fixed number of times in case the error was transient.
+			}
+		}
+	}
+
+	private String toResultString(ReceiveCommand cmd) {
+		switch (cmd.getType()) {
+		case CREATE:
+			return ReflogEntry.PREFIX_CREATED;
+		case UPDATE:
+			// Match the behavior of a single RefUpdate. In that case, setting the
+			// force bit completely bypasses the potentially expensive isMergedInto
+			// check, by design, so the reflog message may be inaccurate.
+			//
+			// Similarly, this class bypasses the isMergedInto checks when the force
+			// bit is set, meaning we can't actually distinguish between UPDATE and
+			// UPDATE_NONFASTFORWARD when isAllowNonFastForwards() returns true.
+			return isAllowNonFastForwards()
+					? ReflogEntry.PREFIX_FORCED_UPDATE : ReflogEntry.PREFIX_FAST_FORWARD;
+		case UPDATE_NONFASTFORWARD:
+			return ReflogEntry.PREFIX_FORCED_UPDATE;
+		default:
+			return null;
+		}
+	}
+
 	private static Map<String, ReceiveCommand> byName(
 			List<ReceiveCommand> commands) {
 		Map<String, ReceiveCommand> ret = new LinkedHashMap<>();
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectoryUpdate.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectoryUpdate.java
index 3c1916b642..1105352524 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectoryUpdate.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectoryUpdate.java
@@ -50,6 +50,7 @@ import java.io.IOException;
 
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.ReflogEntry;
 import org.eclipse.jgit.lib.Repository;
 
 /** Updates any reference stored by {@link RefDirectory}. */
@@ -127,14 +128,14 @@ class RefDirectoryUpdate extends RefUpdate {
 		return status;
 	}
 
-	private String toResultString(final Result status) {
+	private String toResultString(Result status) {
 		switch (status) {
 		case FORCED:
-			return "forced-update"; //$NON-NLS-1$
+			return ReflogEntry.PREFIX_FORCED_UPDATE;
 		case FAST_FORWARD:
-			return "fast forward"; //$NON-NLS-1$
+			return ReflogEntry.PREFIX_FAST_FORWARD;
 		case NEW:
-			return "created"; //$NON-NLS-1$
+			return ReflogEntry.PREFIX_CREATED;
 		default:
 			return null;
 		}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BatchRefUpdate.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BatchRefUpdate.java
index aa85cc7b29..4f1299a6cb 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BatchRefUpdate.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BatchRefUpdate.java
@@ -177,11 +177,17 @@ public class BatchRefUpdate {
 	 * @return message the caller wants to include in the reflog; null if the
 	 *         update should not be logged.
 	 */
+	@Nullable
 	public String getRefLogMessage() {
 		return refLogMessage;
 	}
 
-	/** @return {@code true} if the ref log message should show the result. */
+	/**
+	 * Check whether the reflog message should include the result of the update,
+	 * such as fast-forward or force-update.
+	 *
+	 * @return true if the message should include the result.
+	 */
 	public boolean isRefLogIncludingResult() {
 		return refLogIncludeResult;
 	}
@@ -190,12 +196,11 @@ public class BatchRefUpdate {
 	 * 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
+	 *            the message to describe this change. If null and appendStatus is
+	 *            false, the reflog will not be updated.
 	 * @param appendStatus
 	 *            true if the status of the ref change (fast-forward or
-	 *            forced-update) should be appended to the user supplied
-	 *            message.
+	 *            forced-update) should be appended to the user supplied message.
 	 * @return {@code this}.
 	 */
 	public BatchRefUpdate setRefLogMessage(String msg, boolean appendStatus) {
@@ -213,6 +218,8 @@ public class BatchRefUpdate {
 
 	/**
 	 * Don't record this update in the ref's associated reflog.
+	 * <p>
+	 * Equivalent to {@code setRefLogMessage(null, false)}.
 	 *
 	 * @return {@code this}.
 	 */
@@ -222,7 +229,11 @@ public class BatchRefUpdate {
 		return this;
 	}
 
-	/** @return true if log has been disabled by {@link #disableRefLog()}. */
+	/**
+	 * Check whether log has been disabled by {@link #disableRefLog()}.
+	 *
+	 * @return true if disabled.
+	 */
 	public boolean isRefLogDisabled() {
 		return refLogMessage == null;
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ReflogEntry.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ReflogEntry.java
index 8bd0633789..afa6521d67 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ReflogEntry.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ReflogEntry.java
@@ -50,6 +50,39 @@ package org.eclipse.jgit.lib;
 public interface ReflogEntry {
 
 	/**
+	 * Prefix used in reflog messages when the ref was first created.
+	 * <p>
+	 * Does not have a corresponding constant in C git, but is untranslated like
+	 * the other constants.
+	 *
+	 * @since 4.9
+	 */
+	public static final String PREFIX_CREATED = "created"; //$NON-NLS-1$
+
+	/**
+	 * Prefix used in reflog messages when the ref was updated with a fast
+	 * forward.
+	 * <p>
+	 * Untranslated, and exactly matches the
+	 * <a href="https://git.kernel.org/pub/scm/git/git.git/tree/builtin/fetch.c?id=f3da2b79be9565779e4f76dc5812c68e156afdf0#n680">
+	 * untranslated string in C git</a>.
+	 *
+	 * @since 4.9
+	 */
+	public static final String PREFIX_FAST_FORWARD = "fast-forward"; //$NON-NLS-1$
+
+	/**
+	 * Prefix used in reflog messages when the ref was force updated.
+	 * <p>
+	 * Untranslated, and exactly matches the
+	 * <a href="https://git.kernel.org/pub/scm/git/git.git/tree/builtin/fetch.c?id=f3da2b79be9565779e4f76dc5812c68e156afdf0#n695">
+	 * untranslated string in C git</a>.
+	 *
+	 * @since 4.9
+	 */
+	public static final String PREFIX_FORCED_UPDATE = "forced-update"; //$NON-NLS-1$
+
+	/**
 	 * @return the commit id before the change
 	 */
 	public abstract ObjectId getOldId();