From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Thu, 22 Sep 2011 11:24:23 +0000 (+1000)
Subject: Add explanation why we do not allow to sparse checkout to empty working tree
X-Git-Tag: v1.7.8-rc0~90^2
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=a7bc906f2e64f0d9d3fec91964dc38e390ef69a1;p=git.git

Add explanation why we do not allow to sparse checkout to empty working tree

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/unpack-trees.c b/unpack-trees.c
index 8d4fbaa4a..0f205903e 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1119,8 +1119,13 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 		}
 		if (ret < 0)
 			goto return_failed;
+		/*
+		 * Sparse checkout is meant to narrow down checkout area
+		 * but it does not make sense to narrow down to empty working
+		 * tree. This is usually a mistake in sparse checkout rules.
+		 * Do not allow users to do that.
+		 */
 		if (o->result.cache_nr && empty_worktree) {
-			/* dubious---why should this fail??? */
 			ret = unpack_failed(o, "Sparse checkout leaves no entry on working directory");
 			goto done;
 		}