[push] support the "matching" RefSpecs ":" and "+:"

The implementation of push.default=matching was not correct.
It used the RefSpec "refs/heads/*:refs/heads/*", which would push
_all_ local branches. But "matching" must push only those local
branches for which a remote branch with the same name already exists
at the remote.

This RefSpec can be expanded only once the advertisement from the
remote has been received.

Enhance RefSpec so that ":" and "+:" can be represented. Introduce a
special RemoteRefUpdate for such a RefSpec; it must carry through the
fetch RefSpecs to be able to fill in the remote tracking updates as
needed. Implement the expansion in PushProcess.

Bug: 353405
Change-Id: I54a4bfbb0a6a7d77b9128bf4a9c951d6586c3df4
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

1 files changed, 14 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/RefSpecTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/RefSpecTest.java
index 5569bca23c..b56308cb72 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/RefSpecTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/RefSpecTest.java
@@ -466,4 +466,18 @@ public class RefSpecTest {
 		assertTrue(a.matchSource("refs/heads/master"));
 		assertNull(a.getDestination());
 	}
+
+	@Test
+	public void matching() {
+		RefSpec a = new RefSpec(":");
+		assertTrue(a.isMatching());
+		assertFalse(a.isForceUpdate());
+	}
+
+	@Test
+	public void matchingForced() {
+		RefSpec a = new RefSpec("+:");
+		assertTrue(a.isMatching());
+		assertTrue(a.isForceUpdate());
+	}
 }