1 files changed, 259 insertions, 147 deletions

diff --git a/builtin/replace.c b/builtin/replace.c
index b58c714..30a661e 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -9,16 +9,20 @@
  */
 
 #include "cache.h"
+#include "config.h"
 #include "builtin.h"
 #include "refs.h"
 #include "parse-options.h"
 #include "run-command.h"
+#include "object-store.h"
+#include "repository.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 [-f] --convert-graft-file"),
 	N_("git replace -d <object>..."),
 	N_("git replace [--format=<format>] [-l [<pattern>]]"),
 	NULL
@@ -35,12 +39,13 @@ struct show_data {
 	enum replace_format format;
 };
 
-static int show_reference(const char *refname, const struct object_id *oid,
+static int show_reference(struct repository *r, const char *refname,
+			  const struct object_id *oid,
 			  int flag, void *cb_data)
 {
 	struct show_data *data = cb_data;
 
-	if (!wildmatch(data->pattern, refname, 0, NULL)) {
+	if (!wildmatch(data->pattern, refname, 0)) {
 		if (data->format == REPLACE_FORMAT_SHORT)
 			printf("%s\n", refname);
 		else if (data->format == REPLACE_FORMAT_MEDIUM)
@@ -49,14 +54,14 @@ static int show_reference(const char *refname, const struct object_id *oid,
 			struct object_id object;
 			enum object_type obj_type, repl_type;
 
-			if (get_sha1(refname, object.hash))
-				return error("Failed to resolve '%s' as a valid ref.", refname);
+			if (get_oid(refname, &object))
+				return error(_("failed to resolve '%s' as a valid ref"), refname);
 
-			obj_type = sha1_object_info(object.hash, NULL);
-			repl_type = sha1_object_info(oid->hash, NULL);
+			obj_type = oid_object_info(r, &object, NULL);
+			repl_type = oid_object_info(r, oid, NULL);
 
-			printf("%s (%s) -> %s (%s)\n", refname, typename(obj_type),
-			       oid_to_hex(oid), typename(repl_type));
+			printf("%s (%s) -> %s (%s)\n", refname, type_name(obj_type),
+			       oid_to_hex(oid), type_name(repl_type));
 		}
 	}
 
@@ -78,118 +83,130 @@ static int list_replace_refs(const char *pattern, const char *format)
 	else if (!strcmp(format, "long"))
 		data.format = REPLACE_FORMAT_LONG;
 	else
-		die("invalid replace format '%s'\n"
-		    "valid formats are 'short', 'medium' and 'long'\n",
-		    format);
+		return error(_("invalid replace format '%s'\n"
+			       "valid formats are 'short', 'medium' and 'long'"),
+			     format);
 
-	for_each_replace_ref(show_reference, (void *)&data);
+	for_each_replace_ref(the_repository, show_reference, (void *)&data);
 
 	return 0;
 }
 
 typedef int (*each_replace_name_fn)(const char *name, const char *ref,
-				    const unsigned char *sha1);
+				    const struct object_id *oid);
 
 static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
 {
 	const char **p, *full_hex;
-	char ref[PATH_MAX];
+	struct strbuf ref = STRBUF_INIT;
+	size_t base_len;
 	int had_error = 0;
-	unsigned char sha1[20];
+	struct object_id oid;
+
+	strbuf_addstr(&ref, git_replace_ref_base);
+	base_len = ref.len;
 
 	for (p = argv; *p; p++) {
-		if (get_sha1(*p, sha1)) {
-			error("Failed to resolve '%s' as a valid ref.", *p);
+		if (get_oid(*p, &oid)) {
+			error("failed to resolve '%s' as a valid ref", *p);
 			had_error = 1;
 			continue;
 		}
-		full_hex = sha1_to_hex(sha1);
-		snprintf(ref, sizeof(ref), "%s%s", git_replace_ref_base, full_hex);
-		/* read_ref() may reuse the buffer */
-		full_hex = ref + strlen(git_replace_ref_base);
-		if (read_ref(ref, sha1)) {
-			error("replace ref '%s' not found.", full_hex);
+
+		strbuf_setlen(&ref, base_len);
+		strbuf_addstr(&ref, oid_to_hex(&oid));
+		full_hex = ref.buf + base_len;
+
+		if (read_ref(ref.buf, &oid)) {
+			error(_("replace ref '%s' not found"), full_hex);
 			had_error = 1;
 			continue;
 		}
-		if (fn(full_hex, ref, sha1))
+		if (fn(full_hex, ref.buf, &oid))
 			had_error = 1;
 	}
+	strbuf_release(&ref);
 	return had_error;
 }
 
 static int delete_replace_ref(const char *name, const char *ref,
-			      const unsigned char *sha1)
+			      const struct object_id *oid)
 {
-	if (delete_ref(ref, sha1, 0))
+	if (delete_ref(NULL, ref, oid, 0))
 		return 1;
-	printf("Deleted replace ref '%s'\n", name);
+	printf_ln(_("Deleted replace ref '%s'"), name);
 	return 0;
 }
 
-static void check_ref_valid(unsigned char object[20],
-			    unsigned char prev[20],
-			    char *ref,
-			    int ref_size,
+static int check_ref_valid(struct object_id *object,
+			    struct object_id *prev,
+			    struct strbuf *ref,
 			    int force)
 {
-	if (snprintf(ref, ref_size,
-		     "%s%s", git_replace_ref_base,
-		     sha1_to_hex(object)) > ref_size - 1)
-		die("replace ref name too long: %.*s...", 50, ref);
-	if (check_refname_format(ref, 0))
-		die("'%s' is not a valid ref name.", ref);
-
-	if (read_ref(ref, prev))
-		hashclr(prev);
+	strbuf_reset(ref);
+	strbuf_addf(ref, "%s%s", git_replace_ref_base, oid_to_hex(object));
+	if (check_refname_format(ref->buf, 0))
+		return error(_("'%s' is not a valid ref name"), ref->buf);
+
+	if (read_ref(ref->buf, prev))
+		oidclr(prev);
 	else if (!force)
-		die("replace ref '%s' already exists", ref);
+		return error(_("replace ref '%s' already exists"), ref->buf);
+	return 0;
 }
 
-static int replace_object_sha1(const char *object_ref,
-			       unsigned char object[20],
+static int replace_object_oid(const char *object_ref,
+			       struct object_id *object,
 			       const char *replace_ref,
-			       unsigned char repl[20],
+			       struct object_id *repl,
 			       int force)
 {
-	unsigned char prev[20];
+	struct object_id prev;
 	enum object_type obj_type, repl_type;
-	char ref[PATH_MAX];
+	struct strbuf ref = STRBUF_INIT;
 	struct ref_transaction *transaction;
 	struct strbuf err = STRBUF_INIT;
+	int res = 0;
 
-	obj_type = sha1_object_info(object, NULL);
-	repl_type = sha1_object_info(repl, NULL);
+	obj_type = oid_object_info(the_repository, object, NULL);
+	repl_type = oid_object_info(the_repository, repl, NULL);
 	if (!force && obj_type != repl_type)
-		die("Objects must be of the same type.\n"
-		    "'%s' points to a replaced object of type '%s'\n"
-		    "while '%s' points to a replacement object of type '%s'.",
-		    object_ref, typename(obj_type),
-		    replace_ref, typename(repl_type));
-
-	check_ref_valid(object, prev, ref, sizeof(ref), force);
+		return error(_("Objects must be of the same type.\n"
+			       "'%s' points to a replaced object of type '%s'\n"
+			       "while '%s' points to a replacement object of "
+			       "type '%s'."),
+			     object_ref, type_name(obj_type),
+			     replace_ref, type_name(repl_type));
+
+	if (check_ref_valid(object, &prev, &ref, force)) {
+		strbuf_release(&ref);
+		return -1;
+	}
 
 	transaction = ref_transaction_begin(&err);
 	if (!transaction ||
-	    ref_transaction_update(transaction, ref, repl, prev,
+	    ref_transaction_update(transaction, ref.buf, repl, &prev,
 				   0, NULL, &err) ||
 	    ref_transaction_commit(transaction, &err))
-		die("%s", err.buf);
+		res = error("%s", err.buf);
 
 	ref_transaction_free(transaction);
-	return 0;
+	strbuf_release(&ref);
+	return res;
 }
 
 static int replace_object(const char *object_ref, const char *replace_ref, int force)
 {
-	unsigned char object[20], repl[20];
+	struct object_id object, repl;
 
-	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 (get_oid(object_ref, &object))
+		return error(_("failed to resolve '%s' as a valid ref"),
+			     object_ref);
+	if (get_oid(replace_ref, &repl))
+		return error(_("failed to resolve '%s' as a valid ref"),
+			     replace_ref);
 
-	return replace_object_sha1(object_ref, object, replace_ref, repl, force);
+	return replace_object_oid(object_ref, &object, replace_ref, &repl, force);
 }
 
 /*
@@ -197,7 +214,7 @@ static int replace_object(const char *object_ref, const char *replace_ref, int f
  * If "raw" is true, then the object's raw contents are printed according to
  * "type". Otherwise, we pretty-print the contents for human editing.
  */
-static void export_object(const unsigned char *sha1, enum object_type type,
+static int export_object(const struct object_id *oid, enum object_type type,
 			  int raw, const char *filename)
 {
 	struct child_process cmd = CHILD_PROCESS_INIT;
@@ -205,20 +222,21 @@ static void export_object(const unsigned char *sha1, enum object_type type,
 
 	fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 	if (fd < 0)
-		die_errno("unable to open %s for writing", filename);
+		return error_errno(_("unable to open %s for writing"), filename);
 
 	argv_array_push(&cmd.args, "--no-replace-objects");
 	argv_array_push(&cmd.args, "cat-file");
 	if (raw)
-		argv_array_push(&cmd.args, typename(type));
+		argv_array_push(&cmd.args, type_name(type));
 	else
 		argv_array_push(&cmd.args, "-p");
-	argv_array_push(&cmd.args, sha1_to_hex(sha1));
+	argv_array_push(&cmd.args, oid_to_hex(oid));
 	cmd.git_cmd = 1;
 	cmd.out = fd;
 
 	if (run_command(&cmd))
-		die("cat-file reported failure");
+		return error(_("cat-file reported failure"));
+	return 0;
 }
 
 /*
@@ -226,14 +244,14 @@ static void export_object(const unsigned char *sha1, enum object_type type,
  * interpreting it as "type", and writing the result to the object database.
  * The sha1 of the written object is returned via sha1.
  */
-static void import_object(unsigned char *sha1, enum object_type type,
+static int import_object(struct object_id *oid, enum object_type type,
 			  int raw, const char *filename)
 {
 	int fd;
 
 	fd = open(filename, O_RDONLY);
 	if (fd < 0)
-		die_errno("unable to open %s for reading", filename);
+		return error_errno(_("unable to open %s for reading"), filename);
 
 	if (!raw && type == OBJ_TREE) {
 		const char *argv[] = { "mktree", NULL };
@@ -245,27 +263,40 @@ static void import_object(unsigned char *sha1, enum object_type type,
 		cmd.in = fd;
 		cmd.out = -1;
 
-		if (start_command(&cmd))
-			die("unable to spawn mktree");
+		if (start_command(&cmd)) {
+			close(fd);
+			return error(_("unable to spawn mktree"));
+		}
 
-		if (strbuf_read(&result, cmd.out, 41) < 0)
-			die_errno("unable to read from mktree");
+		if (strbuf_read(&result, cmd.out, 41) < 0) {
+			error_errno(_("unable to read from mktree"));
+			close(fd);
+			close(cmd.out);
+			return -1;
+		}
 		close(cmd.out);
 
-		if (finish_command(&cmd))
-			die("mktree reported failure");
-		if (get_sha1_hex(result.buf, sha1) < 0)
-			die("mktree did not return an object name");
+		if (finish_command(&cmd)) {
+			strbuf_release(&result);
+			return error(_("mktree reported failure"));
+		}
+		if (get_oid_hex(result.buf, oid) < 0) {
+			strbuf_release(&result);
+			return error(_("mktree did not return an object name"));
+		}
 
 		strbuf_release(&result);
 	} else {
 		struct stat st;
 		int flags = HASH_FORMAT_CHECK | HASH_WRITE_OBJECT;
 
-		if (fstat(fd, &st) < 0)
-			die_errno("unable to fstat %s", filename);
-		if (index_fd(sha1, fd, &st, type, NULL, flags) < 0)
-			die("unable to write object to database");
+		if (fstat(fd, &st) < 0) {
+			error_errno(_("unable to fstat %s"), filename);
+			close(fd);
+			return -1;
+		}
+		if (index_fd(oid, fd, &st, type, NULL, flags) < 0)
+			return error(_("unable to write object to database"));
 		/* index_fd close()s fd for us */
 	}
 
@@ -273,38 +304,52 @@ static void import_object(unsigned char *sha1, enum object_type type,
 	 * No need to close(fd) here; both run-command and index-fd
 	 * will have done it for us.
 	 */
+	return 0;
 }
 
 static int edit_and_replace(const char *object_ref, int force, int raw)
 {
-	char *tmpfile = git_pathdup("REPLACE_EDITOBJ");
+	char *tmpfile;
 	enum object_type type;
-	unsigned char old[20], new[20], prev[20];
-	char ref[PATH_MAX];
+	struct object_id old_oid, new_oid, prev;
+	struct strbuf ref = STRBUF_INIT;
 
-	if (get_sha1(object_ref, old) < 0)
-		die("Not a valid object name: '%s'", object_ref);
+	if (get_oid(object_ref, &old_oid) < 0)
+		return error(_("not a valid object name: '%s'"), object_ref);
 
-	type = sha1_object_info(old, NULL);
+	type = oid_object_info(the_repository, &old_oid, NULL);
 	if (type < 0)
-		die("unable to get object type for %s", sha1_to_hex(old));
-
-	check_ref_valid(old, prev, ref, sizeof(ref), force);
+		return error(_("unable to get object type for %s"),
+			     oid_to_hex(&old_oid));
 
-	export_object(old, type, raw, tmpfile);
-	if (launch_editor(tmpfile, NULL, NULL) < 0)
-		die("editing object file failed");
-	import_object(new, type, raw, tmpfile);
+	if (check_ref_valid(&old_oid, &prev, &ref, force)) {
+		strbuf_release(&ref);
+		return -1;
+	}
+	strbuf_release(&ref);
 
+	tmpfile = git_pathdup("REPLACE_EDITOBJ");
+	if (export_object(&old_oid, type, raw, tmpfile)) {
+		free(tmpfile);
+		return -1;
+	}
+	if (launch_editor(tmpfile, NULL, NULL) < 0) {
+		free(tmpfile);
+		return error(_("editing object file failed"));
+	}
+	if (import_object(&new_oid, type, raw, tmpfile)) {
+		free(tmpfile);
+		return -1;
+	}
 	free(tmpfile);
 
-	if (!hashcmp(old, new))
-		return error("new object is the same as the old one: '%s'", sha1_to_hex(old));
+	if (oideq(&old_oid, &new_oid))
+		return error(_("new object is the same as the old one: '%s'"), oid_to_hex(&old_oid));
 
-	return replace_object_sha1(object_ref, old, "replacement", new, force);
+	return replace_object_oid(object_ref, &old_oid, "replacement", &new_oid, force);
 }
 
-static void replace_parents(struct strbuf *buf, int argc, const char **argv)
+static int replace_parents(struct strbuf *buf, int argc, const char **argv)
 {
 	struct strbuf new_parents = STRBUF_INIT;
 	const char *parent_start, *parent_end;
@@ -312,7 +357,7 @@ static void replace_parents(struct strbuf *buf, int argc, const char **argv)
 
 	/* find existing parents */
 	parent_start = buf->buf;
-	parent_start += 46; /* "tree " + "hex sha1" + "\n" */
+	parent_start += GIT_SHA1_HEXSZ + 6; /* "tree " + "hex sha1" + "\n" */
 	parent_end = parent_start;
 
 	while (starts_with(parent_end, "parent "))
@@ -320,11 +365,17 @@ static void replace_parents(struct strbuf *buf, int argc, const char **argv)
 
 	/* 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));
+		struct object_id oid;
+		if (get_oid(argv[i], &oid) < 0) {
+			strbuf_release(&new_parents);
+			return error(_("not a valid object name: '%s'"),
+				     argv[i]);
+		}
+		if (!lookup_commit_reference(the_repository, &oid)) {
+			strbuf_release(&new_parents);
+			return error(_("could not parse %s"), argv[i]);
+		}
+		strbuf_addf(&new_parents, "parent %s\n", oid_to_hex(&oid));
 	}
 
 	/* replace existing parents with new ones */
@@ -332,6 +383,7 @@ static void replace_parents(struct strbuf *buf, int argc, const char **argv)
 		      new_parents.buf, new_parents.len);
 
 	strbuf_release(&new_parents);
+	return 0;
 }
 
 struct check_mergetag_data {
@@ -339,80 +391,130 @@ struct check_mergetag_data {
 	const char **argv;
 };
 
-static void check_one_mergetag(struct commit *commit,
+static int 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 object_id tag_oid;
 	struct tag *tag;
 	int i;
 
-	hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), tag_sha1);
-	tag = lookup_tag(tag_sha1);
+	hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &tag_oid);
+	tag = lookup_tag(the_repository, &tag_oid);
 	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);
+		return error(_("bad mergetag in commit '%s'"), ref);
+	if (parse_tag_buffer(the_repository, tag, extra->value, extra->len))
+		return error(_("malformed mergetag in commit '%s'"), ref);
 
 	/* iterate over new parents */
 	for (i = 1; i < mergetag_data->argc; i++) {
 		struct object_id oid;
-		if (get_sha1(mergetag_data->argv[i], oid.hash) < 0)
-			die(_("Not a valid object name: '%s'"), mergetag_data->argv[i]);
-		if (!oidcmp(&tag->tagged->oid, &oid))
-			return; /* found */
+		if (get_oid(mergetag_data->argv[i], &oid) < 0)
+			return error(_("not a valid object name: '%s'"),
+				     mergetag_data->argv[i]);
+		if (oideq(&tag->tagged->oid, &oid))
+			return 0; /* found */
 	}
 
-	die(_("original commit '%s' contains mergetag '%s' that is discarded; "
-	      "use --edit instead of --graft"), ref, sha1_to_hex(tag_sha1));
+	return error(_("original commit '%s' contains mergetag '%s' that is "
+		       "discarded; use --edit instead of --graft"), ref,
+		     oid_to_hex(&tag_oid));
 }
 
-static void check_mergetags(struct commit *commit, int argc, const char **argv)
+static int 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);
+	return for_each_mergetag(check_one_mergetag, commit, &mergetag_data);
 }
 
-static int create_graft(int argc, const char **argv, int force)
+static int create_graft(int argc, const char **argv, int force, int gentle)
 {
-	unsigned char old[20], new[20];
+	struct object_id old_oid, new_oid;
 	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);
+	if (get_oid(old_ref, &old_oid) < 0)
+		return error(_("not a valid object name: '%s'"), old_ref);
+	commit = lookup_commit_reference(the_repository, &old_oid);
+	if (!commit)
+		return error(_("could not parse %s"), 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 (replace_parents(&buf, argc - 1, &argv[1]) < 0) {
+		strbuf_release(&buf);
+		return -1;
+	}
 
 	if (remove_signature(&buf)) {
-		warning(_("the original commit '%s' has a gpg signature."), old_ref);
+		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 (check_mergetags(commit, argc, argv)) {
+		strbuf_release(&buf);
+		return -1;
+	}
+
+	if (write_object_file(buf.buf, buf.len, commit_type, &new_oid)) {
+		strbuf_release(&buf);
+		return error(_("could not write replacement commit for: '%s'"),
+			     old_ref);
+	}
+
+	strbuf_release(&buf);
+
+	if (oideq(&old_oid, &new_oid)) {
+		if (gentle) {
+			warning(_("graft for '%s' unnecessary"), oid_to_hex(&old_oid));
+			return 0;
+		}
+		return error(_("new commit is the same as the old one: '%s'"), oid_to_hex(&old_oid));
+	}
+
+	return replace_object_oid(old_ref, &old_oid, "replacement", &new_oid, force);
+}
+
+static int convert_graft_file(int force)
+{
+	const char *graft_file = get_graft_file(the_repository);
+	FILE *fp = fopen_or_warn(graft_file, "r");
+	struct strbuf buf = STRBUF_INIT, err = STRBUF_INIT;
+	struct argv_array args = ARGV_ARRAY_INIT;
+
+	if (!fp)
+		return -1;
 
-	if (write_sha1_file(buf.buf, buf.len, commit_type, new))
-		die(_("could not write replacement commit for: '%s'"), old_ref);
+	while (strbuf_getline(&buf, fp) != EOF) {
+		if (*buf.buf == '#')
+			continue;
+
+		argv_array_split(&args, buf.buf);
+		if (args.argc && create_graft(args.argc, args.argv, force, 1))
+			strbuf_addf(&err, "\n\t%s", buf.buf);
+		argv_array_clear(&args);
+	}
+	fclose(fp);
 
 	strbuf_release(&buf);
 
-	if (!hashcmp(old, new))
-		return error("new commit is the same as the old one: '%s'", sha1_to_hex(old));
+	if (!err.len)
+		return unlink_or_warn(graft_file);
+
+	warning(_("could not convert the following graft(s):\n%s"), err.buf);
+	strbuf_release(&err);
 
-	return replace_object_sha1(old_ref, old, "replacement", new, force);
+	return -1;
 }
 
 int cmd_replace(int argc, const char **argv, const char *prefix)
@@ -426,6 +528,7 @@ int cmd_replace(int argc, const char **argv, const char *prefix)
 		MODE_DELETE,
 		MODE_EDIT,
 		MODE_GRAFT,
+		MODE_CONVERT_GRAFT_FILE,
 		MODE_REPLACE
 	} cmdmode = MODE_UNSPECIFIED;
 	struct option options[] = {
@@ -433,13 +536,15 @@ int cmd_replace(int argc, const char **argv, const char *prefix)
 		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_CMDMODE(0, "convert-graft-file", &cmdmode, N_("convert existing graft file"), MODE_CONVERT_GRAFT_FILE),
+		OPT_BOOL_F('f', "force", &force, N_("replace the ref if it exists"),
+			   PARSE_OPT_NOCOMPLETE),
 		OPT_BOOL(0, "raw", &raw, N_("do not pretty-print contents for --edit")),
 		OPT_STRING(0, "format", &format, N_("format"), N_("use this format")),
 		OPT_END()
 	};
 
-	check_replace_refs = 0;
+	read_replace_refs = 0;
 	git_config(git_default_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
@@ -448,52 +553,59 @@ int cmd_replace(int argc, const char **argv, const char *prefix)
 		cmdmode = argc ? MODE_REPLACE : MODE_LIST;
 
 	if (format && cmdmode != MODE_LIST)
-		usage_msg_opt("--format cannot be used when not listing",
+		usage_msg_opt(_("--format cannot be used when not listing"),
 			      git_replace_usage, options);
 
 	if (force &&
 	    cmdmode != MODE_REPLACE &&
 	    cmdmode != MODE_EDIT &&
-	    cmdmode != MODE_GRAFT)
-		usage_msg_opt("-f only makes sense when writing a replacement",
+	    cmdmode != MODE_GRAFT &&
+	    cmdmode != MODE_CONVERT_GRAFT_FILE)
+		usage_msg_opt(_("-f only makes sense when writing a replacement"),
 			      git_replace_usage, options);
 
 	if (raw && cmdmode != MODE_EDIT)
-		usage_msg_opt("--raw only makes sense with --edit",
+		usage_msg_opt(_("--raw only makes sense with --edit"),
 			      git_replace_usage, options);
 
 	switch (cmdmode) {
 	case MODE_DELETE:
 		if (argc < 1)
-			usage_msg_opt("-d needs at least one argument",
+			usage_msg_opt(_("-d needs at least one argument"),
 				      git_replace_usage, options);
 		return for_each_replace_name(argv, delete_replace_ref);
 
 	case MODE_REPLACE:
 		if (argc != 2)
-			usage_msg_opt("bad number of arguments",
+			usage_msg_opt(_("bad number of arguments"),
 				      git_replace_usage, options);
 		return replace_object(argv[0], argv[1], force);
 
 	case MODE_EDIT:
 		if (argc != 1)
-			usage_msg_opt("-e needs exactly one argument",
+			usage_msg_opt(_("-e needs exactly one argument"),
 				      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",
+			usage_msg_opt(_("-g needs at least one argument"),
+				      git_replace_usage, options);
+		return create_graft(argc, argv, force, 0);
+
+	case MODE_CONVERT_GRAFT_FILE:
+		if (argc != 0)
+			usage_msg_opt(_("--convert-graft-file takes no argument"),
 				      git_replace_usage, options);
-		return create_graft(argc, argv, force);
+		return !!convert_graft_file(force);
 
 	case MODE_LIST:
 		if (argc > 1)
-			usage_msg_opt("only one pattern can be given with -l",
+			usage_msg_opt(_("only one pattern can be given with -l"),
 				      git_replace_usage, options);
 		return list_replace_refs(argv[0], format);
 
 	default:
-		die("BUG: invalid cmdmode %d", (int)cmdmode);
+		BUG("invalid cmdmode %d", (int)cmdmode);
 	}
 }