[PATCH 2/2] read-tree: at least one tree-ish argument is required

[Johannes Sixt <j.sixt@viscovery.net>]

From: Johannes Sixt <j6t@kdbg.org>

Previously, it was possible to run read-tree without any arguments,
whereupon it purged the index!

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
 Discovered by typing

   git ..daab02

 with help.autocorrect > 0 :-)

 -- Hannes

 builtin-read-tree.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 50413ca..31623b9 100644
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -125,6 +125,9 @@ int cmd_read_tree(int argc, const char **argv,
 		stage = opts.merge = 1;
 	}

+	if (argc == 0)
+		usage_with_options(read_tree_usage, read_tree_options);
+
 	for (i = 0; i < argc; i++) {
 		const char *arg = argv[i];

-- 
1.6.6.rc1.46.g1635