[PATCH 2/7] checkout-index -h: show usage even in an invalid repository

[Jonathan Nieder <jrnieder@gmail.com>]

From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

checkout-index loads the index before parsing options.  Erroring out
is counterproductive at that point if the operator is hunting for a
command to recover useful data from the broken repository.

[jn: new commit message, tests]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 builtin/checkout-index.c        |    3 +++
 t/t2006-checkout-index-basic.sh |   24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)
 create mode 100755 t/t2006-checkout-index-basic.sh

diff --git a/builtin/checkout-index.c b/builtin/checkout-index.c
index a7a5ee1..3bf3422 100644
--- a/builtin/checkout-index.c
+++ b/builtin/checkout-index.c
@@ -241,6 +241,9 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_checkout_index_usage,
+				   builtin_checkout_index_options);
 	git_config(git_default_config, NULL);
 	state.base_dir = "";
 	prefix_length = prefix ? strlen(prefix) : 0;
diff --git a/t/t2006-checkout-index-basic.sh b/t/t2006-checkout-index-basic.sh
new file mode 100755
index 0000000..b855983
--- /dev/null
+++ b/t/t2006-checkout-index-basic.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='basic checkout-index tests
+'
+
+. ./test-lib.sh
+
+test_expect_success 'checkout-index --gobbledegook' '
+	test_expect_code 129 git checkout-index --gobbledegook 2>err &&
+	grep "[Uu]sage" err
+'
+
+test_expect_success 'checkout-index -h in broken repository' '
+	mkdir broken &&
+	(
+		cd broken &&
+		git init &&
+		>.git/index &&
+		test_expect_code 129 git checkout-index -h >usage 2>&1
+	) &&
+	grep "[Uu]sage" broken/usage
+'
+
+test_done
-- 
1.7.2.3