Expose public getDepth method

The clone or fetch depth is a valuable bit of information
for access logging. Create a public getter to faciliate access.
A precondition check prevents unintentional misuse when the
data isn't valid yet.

Change-Id: I4603d5fd3bd4a767e3e2419b0f2da3664cfbd7f8
Signed-off-by: David Pletcher <dpletcher@google.com>

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

@@ -884,6 +884,19 @@ public class UploadPack {
 		}
 	}
 
+	/**
+	 * Returns the clone/fetch depth. Valid only after calling recvWants().
+	 *
+	 * @return the depth requested by the client, or 0 if unbounded.
+	 * @since 4.0
+	 */
+	public int getDepth() {
+		if (options == null) {
+			throw new IllegalStateException("do not call getDepth() before recvWants()");
+		}
+		return depth;
+	}
+
 	private boolean negotiate() throws IOException {
 		okToGiveUp = Boolean.FALSE;