Replace writeSymref with RefUpdate.link

By using RefUpdate for symbolic reference creation we can reuse
the logic related to updating the reflog with the event, without
needing to expose something such as the legacy ReflogWriter class
(which we no longer have).

Applications using writeSymref must update their code to use the
new pattern of changing the reference through the updateRef method:

    String refName = "refs/heads/master";
    RefUpdate u = repository.updateRef(Constants.HEAD);
    u.setRefLogMessage("checkout: moving to " + refName, false);
    switch (u.link(refName)) {
    case NEW:
    case FORCED:
    case NO_CHANGE:
        // A successful update of the reference
        break;
    default:
        // Handle the failure, e.g. for older behavior
        throw new IOException(u.getResult());
    }

Change-Id: I1093e1ec2970147978a786cfdd0a75d0aebf8010
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java
index 3fe50d6682..571f34b05d 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2009, Google Inc.
+ * Copyright (C) 2008-2010, Google Inc.
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -164,8 +164,11 @@ class Clone extends AbstractFetchCommand {
 	private void doCheckout(final Ref branch) throws IOException {
 		if (branch == null)
 			throw die("cannot checkout; no HEAD advertised by remote");
-		if (!Constants.HEAD.equals(branch.getName()))
-			db.writeSymref(Constants.HEAD, branch.getName());
+		if (!Constants.HEAD.equals(branch.getName())) {
+			RefUpdate u = db.updateRef(Constants.HEAD);
+			u.disableRefLog();
+			u.link(branch.getName());
+		}
 
 		final Commit commit = db.mapCommit(branch.getObjectId());
 		final RefUpdate u = db.updateRef(Constants.HEAD);