From ae1f46989c0515dce640ab339453b09810c0c5a5 Mon Sep 17 00:00:00 2001
From: Colby Ranger
Date: Thu, 8 Aug 2013 07:57:49 -0700
Subject: Advertise capabilities with no refs in upload service.

With reference hiding, it is possible for a repository to appear
empty when all refs are hidden. This causes capabilities to not be
advertised either, since they are published with the first reference,
breaking fetch by SHA1 support.

Always advertise the capabilites by publishing the symbolic capabilities
reference when the repository has no references to advertise (similar to
the receive service).

Change-Id: I8060e430ee03571dc51239e702864c85e888505c
---
 org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
index f0ee974177..fd1de2956d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
@@ -810,6 +810,8 @@ public class UploadPack {
 			adv.advertiseCapability(OPTION_ALLOW_TIP_SHA1_IN_WANT);
 		adv.setDerefTags(true);
 		advertised = adv.send(getAdvertisedOrDefaultRefs());
+		if (adv.isEmpty())
+			adv.advertiseId(ObjectId.zeroId(), "capabilities^{}"); //$NON-NLS-1$
 		adv.end();
 	}
 
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