#include "refs.h"
#include "parse-options.h"
#include "run-command.h"
+#include "tag.h"
static const char * const git_replace_usage[] = {
N_("git replace [-f] <object> <replacement>"),
N_("git replace [-f] --edit <object>"),
+ N_("git replace [-f] --graft <commit> [<parent>...]"),
N_("git replace -d <object>..."),
N_("git replace [--format=<format>] [-l [<pattern>]]"),
NULL
unsigned char prev[20];
enum object_type obj_type, repl_type;
char ref[PATH_MAX];
- struct ref_lock *lock;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
obj_type = sha1_object_info(object, NULL);
repl_type = sha1_object_info(repl, NULL);
check_ref_valid(object, prev, ref, sizeof(ref), force);
- lock = lock_any_ref_for_update(ref, prev, 0, NULL);
- if (!lock)
- die("%s: cannot lock the ref", ref);
- if (write_ref_sha1(lock, repl, NULL) < 0)
- die("%s: cannot update the ref", ref);
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, ref, repl, prev, 0, 1, &err) ||
+ ref_transaction_commit(transaction, NULL, &err))
+ die("%s", err.buf);
+ ref_transaction_free(transaction);
return 0;
}
static void export_object(const unsigned char *sha1, enum object_type type,
int raw, const char *filename)
{
- struct child_process cmd = { NULL };
+ struct child_process cmd = CHILD_PROCESS_INIT;
int fd;
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (!raw && type == OBJ_TREE) {
const char *argv[] = { "mktree", NULL };
- struct child_process cmd = { argv };
+ struct child_process cmd = CHILD_PROCESS_INIT;
struct strbuf result = STRBUF_INIT;
cmd.argv = argv;
return replace_object_sha1(object_ref, old, "replacement", new, force);
}
+static void replace_parents(struct strbuf *buf, int argc, const char **argv)
+{
+ struct strbuf new_parents = STRBUF_INIT;
+ const char *parent_start, *parent_end;
+ int i;
+
+ /* find existing parents */
+ parent_start = buf->buf;
+ parent_start += 46; /* "tree " + "hex sha1" + "\n" */
+ parent_end = parent_start;
+
+ while (starts_with(parent_end, "parent "))
+ parent_end += 48; /* "parent " + "hex sha1" + "\n" */
+
+ /* prepare new parents */
+ for (i = 0; i < argc; i++) {
+ unsigned char sha1[20];
+ if (get_sha1(argv[i], sha1) < 0)
+ die(_("Not a valid object name: '%s'"), argv[i]);
+ lookup_commit_or_die(sha1, argv[i]);
+ strbuf_addf(&new_parents, "parent %s\n", sha1_to_hex(sha1));
+ }
+
+ /* replace existing parents with new ones */
+ strbuf_splice(buf, parent_start - buf->buf, parent_end - parent_start,
+ new_parents.buf, new_parents.len);
+
+ strbuf_release(&new_parents);
+}
+
+struct check_mergetag_data {
+ int argc;
+ const char **argv;
+};
+
+static void check_one_mergetag(struct commit *commit,
+ struct commit_extra_header *extra,
+ void *data)
+{
+ struct check_mergetag_data *mergetag_data = (struct check_mergetag_data *)data;
+ const char *ref = mergetag_data->argv[0];
+ unsigned char tag_sha1[20];
+ struct tag *tag;
+ int i;
+
+ hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), tag_sha1);
+ tag = lookup_tag(tag_sha1);
+ if (!tag)
+ die(_("bad mergetag in commit '%s'"), ref);
+ if (parse_tag_buffer(tag, extra->value, extra->len))
+ die(_("malformed mergetag in commit '%s'"), ref);
+
+ /* iterate over new parents */
+ for (i = 1; i < mergetag_data->argc; i++) {
+ unsigned char sha1[20];
+ if (get_sha1(mergetag_data->argv[i], sha1) < 0)
+ die(_("Not a valid object name: '%s'"), mergetag_data->argv[i]);
+ if (!hashcmp(tag->tagged->sha1, sha1))
+ return; /* found */
+ }
+
+ die(_("original commit '%s' contains mergetag '%s' that is discarded; "
+ "use --edit instead of --graft"), ref, sha1_to_hex(tag_sha1));
+}
+
+static void check_mergetags(struct commit *commit, int argc, const char **argv)
+{
+ struct check_mergetag_data mergetag_data;
+
+ mergetag_data.argc = argc;
+ mergetag_data.argv = argv;
+ for_each_mergetag(check_one_mergetag, commit, &mergetag_data);
+}
+
+static int create_graft(int argc, const char **argv, int force)
+{
+ unsigned char old[20], new[20];
+ const char *old_ref = argv[0];
+ struct commit *commit;
+ struct strbuf buf = STRBUF_INIT;
+ const char *buffer;
+ unsigned long size;
+
+ if (get_sha1(old_ref, old) < 0)
+ die(_("Not a valid object name: '%s'"), old_ref);
+ commit = lookup_commit_or_die(old, old_ref);
+
+ buffer = get_commit_buffer(commit, &size);
+ strbuf_add(&buf, buffer, size);
+ unuse_commit_buffer(commit, buffer);
+
+ replace_parents(&buf, argc - 1, &argv[1]);
+
+ if (remove_signature(&buf)) {
+ warning(_("the original commit '%s' has a gpg signature."), old_ref);
+ warning(_("the signature will be removed in the replacement commit!"));
+ }
+
+ check_mergetags(commit, argc, argv);
+
+ if (write_sha1_file(buf.buf, buf.len, commit_type, new))
+ die(_("could not write replacement commit for: '%s'"), old_ref);
+
+ strbuf_release(&buf);
+
+ if (!hashcmp(old, new))
+ return error("new commit is the same as the old one: '%s'", sha1_to_hex(old));
+
+ return replace_object_sha1(old_ref, old, "replacement", new, force);
+}
+
int cmd_replace(int argc, const char **argv, const char *prefix)
{
int force = 0;
MODE_LIST,
MODE_DELETE,
MODE_EDIT,
+ MODE_GRAFT,
MODE_REPLACE
} cmdmode = MODE_UNSPECIFIED;
struct option options[] = {
OPT_CMDMODE('l', "list", &cmdmode, N_("list replace refs"), MODE_LIST),
OPT_CMDMODE('d', "delete", &cmdmode, N_("delete replace refs"), MODE_DELETE),
OPT_CMDMODE('e', "edit", &cmdmode, N_("edit existing object"), MODE_EDIT),
+ OPT_CMDMODE('g', "graft", &cmdmode, N_("change a commit's parents"), MODE_GRAFT),
OPT_BOOL('f', "force", &force, N_("replace the ref if it exists")),
OPT_BOOL(0, "raw", &raw, N_("do not pretty-print contents for --edit")),
OPT_STRING(0, "format", &format, N_("format"), N_("use this format")),
usage_msg_opt("--format cannot be used when not listing",
git_replace_usage, options);
- if (force && cmdmode != MODE_REPLACE && cmdmode != MODE_EDIT)
+ if (force &&
+ cmdmode != MODE_REPLACE &&
+ cmdmode != MODE_EDIT &&
+ cmdmode != MODE_GRAFT)
usage_msg_opt("-f only makes sense when writing a replacement",
git_replace_usage, options);
git_replace_usage, options);
return edit_and_replace(argv[0], force, raw);
+ case MODE_GRAFT:
+ if (argc < 1)
+ usage_msg_opt("-g needs at least one argument",
+ git_replace_usage, options);
+ return create_graft(argc, argv, force);
+
case MODE_LIST:
if (argc > 1)
usage_msg_opt("only one pattern can be given with -l",