Split TestMissingObjects

Pushing an empty pack should be fine. There was an earlier issue where
deleting refs didn't work because we tried looking for objects in the
uploaded pack and didn't find any. So we do want to preserve that
functionality. We also should be able to accept new refs that point to
commits that are already on the server.

missing objects are actually bad, so we don't need to have pushes work
when a partial graph is supplied. For now, the push still appears to
succeed, but in the next step it won't.

internal/integration/missingobjects_test.go

@@ -19,7 +19,6 @@ import (
 )
 
 func TestMissingObjects(t *testing.T) {
-	const refToCreate = "refs/heads/new-branch"
 
 	x := setUpMissingObjectsTestRepo(t)
 	testRepo := x.TestRepo
@@ -48,9 +47,48 @@ func TestMissingObjects(t *testing.T) {
 			// Try to update the ref that's already there to commit C (but we won't
 			// push its parent and the remote doesn't have the parent either).
 			{info.OldOID, info.NewOID, info.Ref},
+		},
+		pack,
+	)
+
+	refStatus, unpackRes, _, err := readResult(t, srp.Out)
+	require.NoError(t, err)
+	assert.Equal(t, map[string]string{
+		info.Ref: "ng missing necessary objects",
+	}, refStatus)
+	assert.Equal(t, "unpack ok\n", unpackRes)
+}
+
+func TestDeleteAndUpdate(t *testing.T) {
+	const refToCreate = "refs/heads/new-branch"
+
+	x := setUpMissingObjectsTestRepo(t)
+	testRepo := x.TestRepo
+	info := x.Info
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	srp := startSpokesReceivePack(ctx, t, testRepo)
+
+	refs, _, err := readAdv(srp.Out)
+	require.NoError(t, err)
+	assert.Equal(t, refs, map[string]string{
+		info.Ref:    info.OldOID,
+		info.DelRef: info.OldOID,
+	})
+
+	// Send the pack that's missing a commit.
+	pack, err := os.Open("testdata/missing-objects/empty.pack")
+	require.NoError(t, err)
+	defer pack.Close()
+
+	writePushData(
+		t, srp,
+		[]refUpdate{
 			// Try to create another ref with a commit that the remote already has.
-			{objectformat.NullOIDSHA1, info.OldOID, refToCreate},
-			// Try to delete another ref.
+			{objectformat.NullOIDSHA1, info.OldOID, "refs/heads/new-branch"},
+			// Try to delete a ref.
 			{info.OldOID, objectformat.NullOIDSHA1, info.DelRef},
 		},
 		pack,
@@ -61,7 +99,6 @@ func TestMissingObjects(t *testing.T) {
 	assert.Equal(t, map[string]string{
 		info.Ref:    "ng missing necessary objects",
 		info.DelRef: "ok",
-		refToCreate: "ok",
 	}, refStatus)
 	assert.Equal(t, "unpack ok\n", unpackRes)
 }

internal/integration/testdata/set-up-missing-objects-push

@@ -80,6 +80,9 @@ printf '{"push_from":"%s","push_to":"%s","ref":"refs/heads/%s","extra_ref":"refs
 printf "^%s\n%s\n" "$COMMIT_B" "$COMMIT_C" \
 | git pack-objects --revs --stdout >../bad.pack
 
+# Make an empty pack.
+git pack-objects --stdout </dev/null >../empty.pack
+
 cd ..
 rm -rf work.git