X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=builtin-replace.c;h=fe3a647a36c9a064d32c8bf9d9868da041bd82a2;hb=15caa41053c465aeabb1a0d2d3d3c12d701bc62d;hp=b5c40aa22a0b4e66daf46708c33e6b96051f1dda;hpb=54b0c1e041e50cc08b1520b7d557770916d0b7ab;p=git.git

diff --git a/builtin-replace.c b/builtin-replace.c
index b5c40aa22..fe3a647a3 100644
--- a/builtin-replace.c
+++ b/builtin-replace.c
@@ -14,6 +14,7 @@
 #include "parse-options.h"
 
 static const char * const git_replace_usage[] = {
+	"git replace [-f] <object> <replacement>",
 	"git replace -d <object>...",
 	"git replace -l [<pattern>]",
 	NULL
@@ -77,29 +78,82 @@ static int delete_replace_ref(const char *name, const char *ref,
 	return 0;
 }
 
+static int replace_object(const char *object_ref, const char *replace_ref,
+			  int force)
+{
+	unsigned char object[20], prev[20], repl[20];
+	char ref[PATH_MAX];
+	struct ref_lock *lock;
+
+	if (get_sha1(object_ref, object))
+		die("Failed to resolve '%s' as a valid ref.", object_ref);
+	if (get_sha1(replace_ref, repl))
+		die("Failed to resolve '%s' as a valid ref.", replace_ref);
+
+	if (snprintf(ref, sizeof(ref),
+		     "refs/replace/%s",
+		     sha1_to_hex(object)) > sizeof(ref) - 1)
+		die("replace ref name too long: %.*s...", 50, ref);
+	if (check_ref_format(ref))
+		die("'%s' is not a valid ref name.", ref);
+
+	if (!resolve_ref(ref, prev, 1, NULL))
+		hashclr(prev);
+	else if (!force)
+		die("replace ref '%s' already exists", ref);
+
+	lock = lock_any_ref_for_update(ref, prev, 0);
+	if (!lock)
+		die("%s: cannot lock the ref", ref);
+	if (write_ref_sha1(lock, repl, NULL) < 0)
+		die("%s: cannot update the ref", ref);
+
+	return 0;
+}
+
 int cmd_replace(int argc, const char **argv, const char *prefix)
 {
-	int list = 0, delete = 0;
+	int list = 0, delete = 0, force = 0;
 	struct option options[] = {
 		OPT_BOOLEAN('l', NULL, &list, "list replace refs"),
 		OPT_BOOLEAN('d', NULL, &delete, "delete replace refs"),
+		OPT_BOOLEAN('f', NULL, &force, "replace the ref if it exists"),
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, options, git_replace_usage, 0);
+	argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
 
 	if (list && delete)
-		usage_with_options(git_replace_usage, options);
+		usage_msg_opt("-l and -d cannot be used together",
+			      git_replace_usage, options);
+
+	if (force && (list || delete))
+		usage_msg_opt("-f cannot be used with -d or -l",
+			      git_replace_usage, options);
 
+	/* Delete refs */
 	if (delete) {
 		if (argc < 1)
-			usage_with_options(git_replace_usage, options);
+			usage_msg_opt("-d needs at least one argument",
+				      git_replace_usage, options);
 		return for_each_replace_name(argv, delete_replace_ref);
 	}
 
+	/* Replace object */
+	if (!list && argc) {
+		if (argc != 2)
+			usage_msg_opt("bad number of arguments",
+				      git_replace_usage, options);
+		return replace_object(argv[0], argv[1], force);
+	}
+
 	/* List refs, even if "list" is not set */
 	if (argc > 1)
-		usage_with_options(git_replace_usage, options);
+		usage_msg_opt("only one pattern can be given with -l",
+			      git_replace_usage, options);
+	if (force)
+		usage_msg_opt("-f needs some arguments",
+			      git_replace_usage, options);
 
 	return list_replace_refs(argv[0]);
 }