[PATCH 2/2] cat-file: add --literally option.

[Karthik Nayak <karthik.188@gmail.com>]

Add --literally option which when used with -t option
gives the type of the object given, irrelevant of the type
and its contents.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 builtin/cat-file.c | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index df99df4..1db94fe 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -107,6 +107,29 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 	return 0;
 }
 
+static int cat_one_file_literally(int opt, const char *exp_type, const char *obj_name)
+{
+	unsigned char sha1[20];
+	unsigned char type[32];
+	struct object_context obj_context;
+	struct object_info oi = {NULL};
+	int retval = 0;
+
+	if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
+		die("Not a valid object name %s", obj_name);
+
+	retval = has_sha1_file(sha1);
+	if (!retval)
+		return retval;
+
+	if(sha1_object_type_literally(sha1, type))
+		die("git cat-file -t --literally %s: invalid object", obj_name);
+
+	printf("%s\n", type);
+
+	return retval;
+}
+
 struct expand_data {
 	unsigned char sha1[20];
 	enum object_type type;
@@ -324,7 +347,7 @@ static int batch_objects(struct batch_options *opt)
 
 static const char * const cat_file_usage[] = {
 	N_("git cat-file (-t | -s | -e | -p | <type> | --textconv) <object>"),
-	N_("git cat-file (--batch | --batch-check) < <list-of-objects>"),
+	N_("git cat-file (-t|-s|-e|-p|<type>|--textconv|-t --literally) <object>"),
 	NULL
 };
 
@@ -359,6 +382,7 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 	int opt = 0;
 	const char *exp_type = NULL, *obj_name = NULL;
 	struct batch_options batch = {0};
+	int literally = 0;
 
 	const struct option options[] = {
 		OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
@@ -369,6 +393,8 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 		OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 		OPT_SET_INT(0, "textconv", &opt,
 			    N_("for blob objects, run textconv on object's content"), 'c'),
+		OPT_BOOL( 0, "literally", &literally,
+			  N_("show the type of the gicen loose object, use for debugging")),
 		{ OPTION_CALLBACK, 0, "batch", &batch, "format",
 			N_("show info and content of objects fed from the standard input"),
 			PARSE_OPT_OPTARG, batch_option_callback },
@@ -380,7 +406,7 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 
 	git_config(git_cat_file_config, NULL);
 
-	if (argc != 3 && argc != 2)
+	if (argc != 3 && argc != 2 && (!literally && argc != 4))
 		usage_with_options(cat_file_usage, options);
 
 	argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
@@ -405,5 +431,10 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 	if (batch.enabled)
 		return batch_objects(&batch);
 
+	if (literally && opt == 't')
+		return cat_one_file_literally(opt, exp_type, obj_name);
+	else if (literally)
+		usage_with_options(cat_file_usage, options);
+
 	return cat_one_file(opt, exp_type, obj_name);
 }
-- 
2.3.1.129.g11acff1.dirty