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* Builtin "git replace"
* Copyright (c) 2008 Christian Couder <>
* Based on builtin-tag.c by Kristian Høgsberg <>
* and Carlos Rica <> that was itself based on
* and mktag.c by Linus Torvalds.
#include "cache.h"
#include "builtin.h"
#include "refs.h"
#include "parse-options.h"
static const char * const git_replace_usage[] = {
"git replace [-f] <object> <replacement>",
"git replace -d <object>...",
"git replace -l [<pattern>]",
static int show_reference(const char *refname, const unsigned char *sha1,
int flag, void *cb_data)
const char *pattern = cb_data;
if (!fnmatch(pattern, refname, 0))
printf("%s\n", refname);
return 0;
static int list_replace_refs(const char *pattern)
if (pattern == NULL)
pattern = "*";
for_each_replace_ref(show_reference, (void *) pattern);
return 0;
typedef int (*each_replace_name_fn)(const char *name, const char *ref,
const unsigned char *sha1);
static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
const char **p;
char ref[PATH_MAX];
int had_error = 0;
unsigned char sha1[20];
for (p = argv; *p; p++) {
if (snprintf(ref, sizeof(ref), "refs/replace/%s", *p)
>= sizeof(ref)) {
error("replace ref name too long: %.*s...", 50, *p);
had_error = 1;
if (!resolve_ref(ref, sha1, 1, NULL)) {
error("replace ref '%s' not found.", *p);
had_error = 1;
if (fn(*p, ref, sha1))
had_error = 1;
return had_error;
static int delete_replace_ref(const char *name, const char *ref,
const unsigned char *sha1)
if (delete_ref(ref, sha1, 0))
return 1;
printf("Deleted replace ref '%s'\n", name);
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),
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))
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, 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"),
argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
if (list && delete)
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_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_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]);
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