Merge branch 'nd/i18n'

More _("i18n") markings.

* nd/i18n:
  fsck: mark strings for translation
  fsck: reduce word legos to help i18n
  parse-options.c: mark more strings for translation
  parse-options.c: turn some die() to BUG()
  parse-options: replace opterror() with optname()
  repack: mark more strings for translation
  remote.c: mark messages for translation
  remote.c: turn some error() or die() to BUG()
  reflog: mark strings for translation
  read-cache.c: add missing colon separators
  read-cache.c: mark more strings for translation
  read-cache.c: turn die("internal error") to BUG()
  attr.c: mark more string for translation
  archive.c: mark more strings for translation
  alias.c: mark split_cmdline_strerror() strings for translation
  git.c: mark more strings for translation

23 files changed, 303 insertions, 266 deletions

diff --git a/alias.c b/alias.c
index a7e4e57..c471538 100644
--- a/alias.c
+++ b/alias.c
@@ -47,8 +47,8 @@ void list_aliases(struct string_list *list)
 #define SPLIT_CMDLINE_BAD_ENDING 1
 #define SPLIT_CMDLINE_UNCLOSED_QUOTE 2
 static const char *split_cmdline_errors[] = {
-	"cmdline ends with \\",
-	"unclosed quote"
+	N_("cmdline ends with \\"),
+	N_("unclosed quote")
 };
 
 int split_cmdline(char *cmdline, const char ***argv)
diff --git a/archive.c b/archive.c
index fd556c2..180d97c 100644
--- a/archive.c
+++ b/archive.c
@@ -391,12 +391,12 @@ static void parse_treeish_arg(const char **argv,
 		int refnamelen = colon - name;
 
 		if (!dwim_ref(name, refnamelen, &oid, &ref))
-			die("no such ref: %.*s", refnamelen, name);
+			die(_("no such ref: %.*s"), refnamelen, name);
 		free(ref);
 	}
 
 	if (get_oid(name, &oid))
-		die("Not a valid object name");
+		die(_("not a valid object name: %s"), name);
 
 	commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 	if (commit) {
@@ -409,7 +409,7 @@ static void parse_treeish_arg(const char **argv,
 
 	tree = parse_tree_indirect(&oid);
 	if (tree == NULL)
-		die("not a tree object");
+		die(_("not a tree object: %s"), oid_to_hex(&oid));
 
 	if (prefix) {
 		struct object_id tree_oid;
@@ -419,7 +419,7 @@ static void parse_treeish_arg(const char **argv,
 		err = get_tree_entry(&tree->object.oid, prefix, &tree_oid,
 				     &mode);
 		if (err || !S_ISDIR(mode))
-			die("current working directory is untracked");
+			die(_("current working directory is untracked"));
 
 		tree = parse_tree_indirect(&tree_oid);
 	}
diff --git a/attr.c b/attr.c
index eaece66..b63fe0f 100644
--- a/attr.c
+++ b/attr.c
@@ -366,8 +366,8 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
 	if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 	    starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
 		if (!macro_ok) {
-			fprintf(stderr, "%s not allowed: %s:%d\n",
-				name, src, lineno);
+			fprintf_ln(stderr, _("%s not allowed: %s:%d"),
+				   name, src, lineno);
 			goto fail_return;
 		}
 		is_macro = 1;
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 3c3e0f0..a281d7c 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -51,16 +51,24 @@ static int name_objects;
 
 static const char *describe_object(struct object *obj)
 {
-	static struct strbuf buf = STRBUF_INIT;
-	char *name = name_objects ?
-		lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
+	static struct strbuf bufs[] = {
+		STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
+	};
+	static int b = 0;
+	struct strbuf *buf;
+	char *name = NULL;
 
-	strbuf_reset(&buf);
-	strbuf_addstr(&buf, oid_to_hex(&obj->oid));
+	if (name_objects)
+		name = lookup_decoration(fsck_walk_options.object_names, obj);
+
+	buf = bufs + b;
+	b = (b + 1) % ARRAY_SIZE(bufs);
+	strbuf_reset(buf);
+	strbuf_addstr(buf, oid_to_hex(&obj->oid));
 	if (name)
-		strbuf_addf(&buf, " (%s)", name);
+		strbuf_addf(buf, " (%s)", name);
 
-	return buf.buf;
+	return buf->buf;
 }
 
 static const char *printable_type(struct object *obj)
@@ -76,7 +84,7 @@ static const char *printable_type(struct object *obj)
 
 	ret = type_name(obj->type);
 	if (!ret)
-		ret = "unknown";
+		ret = _("unknown");
 
 	return ret;
 }
@@ -104,25 +112,32 @@ static int fsck_config(const char *var, const char *value, void *cb)
 	return git_default_config(var, value, cb);
 }
 
-static void objreport(struct object *obj, const char *msg_type,
-			const char *err)
-{
-	fprintf(stderr, "%s in %s %s: %s\n",
-		msg_type, printable_type(obj), describe_object(obj), err);
-}
-
 static int objerror(struct object *obj, const char *err)
 {
 	errors_found |= ERROR_OBJECT;
-	objreport(obj, "error", err);
+	/* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
+	fprintf_ln(stderr, _("error in %s %s: %s"),
+		   printable_type(obj), describe_object(obj), err);
 	return -1;
 }
 
 static int fsck_error_func(struct fsck_options *o,
 	struct object *obj, int type, const char *message)
 {
-	objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
-	return (type == FSCK_WARN) ? 0 : 1;
+	switch (type) {
+	case FSCK_WARN:
+		/* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
+		fprintf_ln(stderr, _("warning in %s %s: %s"),
+			   printable_type(obj), describe_object(obj), message);
+		return 0;
+	case FSCK_ERROR:
+		/* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
+		fprintf_ln(stderr, _("error in %s %s: %s"),
+			   printable_type(obj), describe_object(obj), message);
+		return 1;
+	default:
+		BUG("%d (FSCK_IGNORE?) should never trigger this callback", type);
+	}
 }
 
 static struct object_array pending;
@@ -138,17 +153,18 @@ static int mark_object(struct object *obj, int type, void *data, struct fsck_opt
 	 */
 	if (!obj) {
 		/* ... these references to parent->fld are safe here */
-		printf("broken link from %7s %s\n",
-			   printable_type(parent), describe_object(parent));
-		printf("broken link from %7s %s\n",
-			   (type == OBJ_ANY ? "unknown" : type_name(type)), "unknown");
+		printf_ln(_("broken link from %7s %s"),
+			  printable_type(parent), describe_object(parent));
+		printf_ln(_("broken link from %7s %s"),
+			  (type == OBJ_ANY ? _("unknown") : type_name(type)),
+			  _("unknown"));
 		errors_found |= ERROR_REACHABLE;
 		return 1;
 	}
 
 	if (type != OBJ_ANY && obj->type != type)
 		/* ... and the reference to parent is safe here */
-		objerror(parent, "wrong object type in link");
+		objerror(parent, _("wrong object type in link"));
 
 	if (obj->flags & REACHABLE)
 		return 0;
@@ -164,10 +180,12 @@ static int mark_object(struct object *obj, int type, void *data, struct fsck_opt
 
 	if (!(obj->flags & HAS_OBJ)) {
 		if (parent && !has_object_file(&obj->oid)) {
-			printf("broken link from %7s %s\n",
-				 printable_type(parent), describe_object(parent));
-			printf("              to %7s %s\n",
-				 printable_type(obj), describe_object(obj));
+			printf_ln(_("broken link from %7s %s\n"
+				    "              to %7s %s"),
+				  printable_type(parent),
+				  describe_object(parent),
+				  printable_type(obj),
+				  describe_object(obj));
 			errors_found |= ERROR_REACHABLE;
 		}
 		return 1;
@@ -231,8 +249,8 @@ static void check_reachable_object(struct object *obj)
 			return;
 		if (has_object_pack(&obj->oid))
 			return; /* it is in pack - forget about it */
-		printf("missing %s %s\n", printable_type(obj),
-			describe_object(obj));
+		printf_ln(_("missing %s %s"), printable_type(obj),
+			  describe_object(obj));
 		errors_found |= ERROR_REACHABLE;
 		return;
 	}
@@ -257,8 +275,8 @@ static void check_unreachable_object(struct object *obj)
 	 * since this is something that is prunable.
 	 */
 	if (show_unreachable) {
-		printf("unreachable %s %s\n", printable_type(obj),
-			describe_object(obj));
+		printf_ln(_("unreachable %s %s"), printable_type(obj),
+			  describe_object(obj));
 		return;
 	}
 
@@ -276,8 +294,8 @@ static void check_unreachable_object(struct object *obj)
 	 */
 	if (!(obj->flags & USED)) {
 		if (show_dangling)
-			printf("dangling %s %s\n", printable_type(obj),
-			       describe_object(obj));
+			printf_ln(_("dangling %s %s"), printable_type(obj),
+				  describe_object(obj));
 		if (write_lost_and_found) {
 			char *filename = git_pathdup("lost-found/%s/%s",
 				obj->type == OBJ_COMMIT ? "commit" : "other",
@@ -285,18 +303,18 @@ static void check_unreachable_object(struct object *obj)
 			FILE *f;
 
 			if (safe_create_leading_directories_const(filename)) {
-				error("Could not create lost-found");
+				error(_("could not create lost-found"));
 				free(filename);
 				return;
 			}
 			f = xfopen(filename, "w");
 			if (obj->type == OBJ_BLOB) {
 				if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
-					die_errno("Could not write '%s'", filename);
+					die_errno(_("could not write '%s'"), filename);
 			} else
 				fprintf(f, "%s\n", describe_object(obj));
 			if (fclose(f))
-				die_errno("Could not finish '%s'",
+				die_errno(_("could not finish '%s'"),
 					  filename);
 			free(filename);
 		}
@@ -313,7 +331,7 @@ static void check_unreachable_object(struct object *obj)
 static void check_object(struct object *obj)
 {
 	if (verbose)
-		fprintf(stderr, "Checking %s\n", describe_object(obj));
+		fprintf_ln(stderr, _("Checking %s"), describe_object(obj));
 
 	if (obj->flags & REACHABLE)
 		check_reachable_object(obj);
@@ -331,7 +349,7 @@ static void check_connectivity(void)
 	/* Look up all the requirements, warn about missing objects.. */
 	max = get_max_object_index();
 	if (verbose)
-		fprintf(stderr, "Checking connectivity (%d objects)\n", max);
+		fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
 
 	for (i = 0; i < max; i++) {
 		struct object *obj = get_indexed_object(i);
@@ -350,11 +368,11 @@ static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 	obj->flags |= SEEN;
 
 	if (verbose)
-		fprintf(stderr, "Checking %s %s\n",
-			printable_type(obj), describe_object(obj));
+		fprintf_ln(stderr, _("Checking %s %s"),
+			   printable_type(obj), describe_object(obj));
 
 	if (fsck_walk(obj, NULL, &fsck_obj_options))
-		objerror(obj, "broken links");
+		objerror(obj, _("broken links"));
 	err = fsck_object(obj, buffer, size, &fsck_obj_options);
 	if (err)
 		goto out;
@@ -363,17 +381,19 @@ static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 		struct commit *commit = (struct commit *) obj;
 
 		if (!commit->parents && show_root)
-			printf("root %s\n", describe_object(&commit->object));
+			printf_ln(_("root %s"),
+				  describe_object(&commit->object));
 	}
 
 	if (obj->type == OBJ_TAG) {
 		struct tag *tag = (struct tag *) obj;
 
 		if (show_tags && tag->tagged) {
-			printf("tagged %s %s", printable_type(tag->tagged),
-				describe_object(tag->tagged));
-			printf(" (%s) in %s\n", tag->tag,
-				describe_object(&tag->object));
+			printf_ln(_("tagged %s %s (%s) in %s"),
+				  printable_type(tag->tagged),
+				  describe_object(tag->tagged),
+				  tag->tag,
+				  describe_object(&tag->object));
 		}
 	}
 
@@ -397,7 +417,8 @@ static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 				  eaten);
 	if (!obj) {
 		errors_found |= ERROR_OBJECT;
-		return error("%s: object corrupt or missing", oid_to_hex(oid));
+		return error(_("%s: object corrupt or missing"),
+			     oid_to_hex(oid));
 	}
 	obj->flags &= ~(REACHABLE | SEEN);
 	obj->flags |= HAS_OBJ;
@@ -421,7 +442,8 @@ static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 			obj->flags |= USED;
 			mark_object_reachable(obj);
 		} else if (!is_promisor_object(oid)) {
-			error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
+			error(_("%s: invalid reflog entry %s"),
+			      refname, oid_to_hex(oid));
 			errors_found |= ERROR_REACHABLE;
 		}
 	}
@@ -434,8 +456,8 @@ static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid
 	const char *refname = cb_data;
 
 	if (verbose)
-		fprintf(stderr, "Checking reflog %s->%s\n",
-			oid_to_hex(ooid), oid_to_hex(noid));
+		fprintf_ln(stderr, _("Checking reflog %s->%s"),
+			   oid_to_hex(ooid), oid_to_hex(noid));
 
 	fsck_handle_reflog_oid(refname, ooid, 0);
 	fsck_handle_reflog_oid(refname, noid, timestamp);
@@ -468,13 +490,14 @@ static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 			 default_refs++;
 			 return 0;
 		}
-		error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
+		error(_("%s: invalid sha1 pointer %s"),
+		      refname, oid_to_hex(oid));
 		errors_found |= ERROR_REACHABLE;
 		/* We'll continue with the rest despite the error.. */
 		return 0;
 	}
 	if (obj->type != OBJ_COMMIT && is_branch(refname)) {
-		error("%s: not a commit", refname);
+		error(_("%s: not a commit"), refname);
 		errors_found |= ERROR_REFS;
 	}
 	default_refs++;
@@ -529,7 +552,7 @@ static void get_default_heads(void)
 	 * "show_unreachable" flag.
 	 */
 	if (!default_refs) {
-		fprintf(stderr, "notice: No default references\n");
+		fprintf_ln(stderr, _("notice: No default references"));
 		show_unreachable = 0;
 	}
 }
@@ -544,7 +567,7 @@ static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 
 	if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 		errors_found |= ERROR_OBJECT;
-		error("%s: object corrupt or missing: %s",
+		error(_("%s: object corrupt or missing: %s"),
 		      oid_to_hex(oid), path);
 		return 0; /* keep checking other objects */
 	}
@@ -557,7 +580,7 @@ static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 
 	if (!obj) {
 		errors_found |= ERROR_OBJECT;
-		error("%s: object could not be parsed: %s",
+		error(_("%s: object could not be parsed: %s"),
 		      oid_to_hex(oid), path);
 		if (!eaten)
 			free(contents);
@@ -577,7 +600,7 @@ static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 static int fsck_cruft(const char *basename, const char *path, void *data)
 {
 	if (!starts_with(basename, "tmp_obj_"))
-		fprintf(stderr, "bad sha1 file: %s\n", path);
+		fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 	return 0;
 }
 
@@ -592,7 +615,7 @@ static void fsck_object_dir(const char *path)
 	struct progress *progress = NULL;
 
 	if (verbose)
-		fprintf(stderr, "Checking object directory\n");
+		fprintf_ln(stderr, _("Checking object directory"));
 
 	if (show_progress)
 		progress = start_progress(_("Checking object directories"), 256);
@@ -610,29 +633,30 @@ static int fsck_head_link(const char *head_ref_name,
 	int null_is_error = 0;
 
 	if (verbose)
-		fprintf(stderr, "Checking %s link\n", head_ref_name);
+		fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
 
 	*head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 	if (!*head_points_at) {
 		errors_found |= ERROR_REFS;
-		return error("Invalid %s", head_ref_name);
+		return error(_("invalid %s"), head_ref_name);
 	}
 	if (!strcmp(*head_points_at, head_ref_name))
 		/* detached HEAD */
 		null_is_error = 1;
 	else if (!starts_with(*head_points_at, "refs/heads/")) {
 		errors_found |= ERROR_REFS;
-		return error("%s points to something strange (%s)",
+		return error(_("%s points to something strange (%s)"),
 			     head_ref_name, *head_points_at);
 	}
 	if (is_null_oid(head_oid)) {
 		if (null_is_error) {
 			errors_found |= ERROR_REFS;
-			return error("%s: detached HEAD points at nothing",
+			return error(_("%s: detached HEAD points at nothing"),
 				     head_ref_name);
 		}
-		fprintf(stderr, "notice: %s points to an unborn branch (%s)\n",
-			head_ref_name, *head_points_at + 11);
+		fprintf_ln(stderr,
+			   _("notice: %s points to an unborn branch (%s)"),
+			   head_ref_name, *head_points_at + 11);
 	}
 	return 0;
 }
@@ -643,12 +667,12 @@ static int fsck_cache_tree(struct cache_tree *it)
 	int err = 0;
 
 	if (verbose)
-		fprintf(stderr, "Checking cache tree\n");
+		fprintf_ln(stderr, _("Checking cache tree"));
 
 	if (0 <= it->entry_count) {
 		struct object *obj = parse_object(the_repository, &it->oid);
 		if (!obj) {
-			error("%s: invalid sha1 pointer in cache-tree",
+			error(_("%s: invalid sha1 pointer in cache-tree"),
 			      oid_to_hex(&it->oid));
 			errors_found |= ERROR_REFS;
 			return 1;
@@ -659,7 +683,7 @@ static int fsck_cache_tree(struct cache_tree *it)
 				obj, xstrdup(":"));
 		mark_object_reachable(obj);
 		if (obj->type != OBJ_TREE)
-			err |= objerror(obj, "non-tree in cache-tree");
+			err |= objerror(obj, _("non-tree in cache-tree"));
 	}
 	for (i = 0; i < it->subtree_nr; i++)
 		err |= fsck_cache_tree(it->down[i]->cache_tree);
@@ -800,7 +824,7 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
 			if (!obj || !(obj->flags & HAS_OBJ)) {
 				if (is_promisor_object(&oid))
 					continue;
-				error("%s: object missing", oid_to_hex(&oid));
+				error(_("%s: object missing"), oid_to_hex(&oid));
 				errors_found |= ERROR_OBJECT;
 				continue;
 			}
@@ -812,7 +836,7 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
 			mark_object_reachable(obj);
 			continue;
 		}
-		error("invalid parameter: expected sha1, got '%s'", arg);
+		error(_("invalid parameter: expected sha1, got '%s'"), arg);
 		errors_found |= ERROR_OBJECT;
 	}
 
diff --git a/builtin/merge.c b/builtin/merge.c
index c3c976d..42e227e 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -128,7 +128,7 @@ static int option_read_message(struct parse_opt_ctx_t *ctx,
 		ctx->argc--;
 		arg = *++ctx->argv;
 	} else
-		return opterror(opt, "requires a value", 0);
+		return error(_("option `%s' requires a value"), opt->long_name);
 
 	if (buf->len)
 		strbuf_addch(buf, '\n');
@@ -578,7 +578,7 @@ static void parse_branch_merge_options(char *bmo)
 	argc = split_cmdline(bmo, &argv);
 	if (argc < 0)
 		die(_("Bad branch.%s.mergeoptions string: %s"), branch,
-		    split_cmdline_strerror(argc));
+		    _(split_cmdline_strerror(argc)));
 	REALLOC_ARRAY(argv, argc + 2);
 	MOVE_ARRAY(argv + 1, argv, argc + 1);
 	argc++;
diff --git a/builtin/reflog.c b/builtin/reflog.c
index 7a85e4b..64a8df4 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -14,11 +14,15 @@
 
 /* NEEDSWORK: switch to using parse_options */
 static const char reflog_expire_usage[] =
-"git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
+N_("git reflog expire [--expire=<time>] "
+   "[--expire-unreachable=<time>] "
+   "[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
+   "[--verbose] [--all] <refs>...");
 static const char reflog_delete_usage[] =
-"git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
+N_("git reflog delete [--rewrite] [--updateref] "
+   "[--dry-run | -n] [--verbose] <refs>...");
 static const char reflog_exists_usage[] =
-"git reflog exists <ref>";
+N_("git reflog exists <ref>");
 
 static timestamp_t default_reflog_expire;
 static timestamp_t default_reflog_expire_unreachable;
@@ -585,7 +589,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 			break;
 		}
 		else if (arg[0] == '-')
-			usage(reflog_expire_usage);
+			usage(_(reflog_expire_usage));
 		else
 			break;
 	}
@@ -598,7 +602,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 	if (cb.cmd.stalefix) {
 		repo_init_revisions(the_repository, &cb.cmd.revs, prefix);
 		if (flags & EXPIRE_REFLOGS_VERBOSE)
-			printf("Marking reachable objects...");
+			printf(_("Marking reachable objects..."));
 		mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL);
 		if (flags & EXPIRE_REFLOGS_VERBOSE)
 			putchar('\n');
@@ -636,7 +640,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 		char *ref;
 		struct object_id oid;
 		if (!dwim_log(argv[i], strlen(argv[i]), &oid, &ref)) {
-			status |= error("%s points nowhere!", argv[i]);
+			status |= error(_("%s points nowhere!"), argv[i]);
 			continue;
 		}
 		set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
@@ -682,13 +686,13 @@ static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 			break;
 		}
 		else if (arg[0] == '-')
-			usage(reflog_delete_usage);
+			usage(_(reflog_delete_usage));
 		else
 			break;
 	}
 
 	if (argc - i < 1)
-		return error("Nothing to delete?");
+		return error(_("no reflog specified to delete"));
 
 	for ( ; i < argc; i++) {
 		const char *spec = strstr(argv[i], "@{");
@@ -697,12 +701,12 @@ static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 		int recno;
 
 		if (!spec) {
-			status |= error("Not a reflog: %s", argv[i]);
+			status |= error(_("not a reflog: %s"), argv[i]);
 			continue;
 		}
 
 		if (!dwim_log(argv[i], spec - argv[i], &oid, &ref)) {
-			status |= error("no reflog for '%s'", argv[i]);
+			status |= error(_("no reflog for '%s'"), argv[i]);
 			continue;
 		}
 
@@ -737,7 +741,7 @@ static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
 			break;
 		}
 		else if (arg[0] == '-')
-			usage(reflog_exists_usage);
+			usage(_(reflog_exists_usage));
 		else
 			break;
 	}
@@ -745,10 +749,10 @@ static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
 	start = i;
 
 	if (argc - start != 1)
-		usage(reflog_exists_usage);
+		usage(_(reflog_exists_usage));
 
 	if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL))
-		die("invalid ref format: %s", argv[start]);
+		die(_("invalid ref format: %s"), argv[start]);
 	return !reflog_exists(argv[start]);
 }
 
@@ -757,12 +761,12 @@ static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
  */
 
 static const char reflog_usage[] =
-"git reflog [ show | expire | delete | exists ]";
+N_("git reflog [ show | expire | delete | exists ]");
 
 int cmd_reflog(int argc, const char **argv, const char *prefix)
 {
 	if (argc > 1 && !strcmp(argv[1], "-h"))
-		usage(reflog_usage);
+		usage(_(reflog_usage));
 
 	/* With no command, we default to showing it. */
 	if (argc < 2 || *argv[1] == '-')
diff --git a/builtin/repack.c b/builtin/repack.c
index 4558368..2a1c7b2 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -197,7 +197,7 @@ static int write_oid(const struct object_id *oid, struct packed_git *pack,
 
 	if (cmd->in == -1) {
 		if (start_command(cmd))
-			die("Could not start pack-objects to repack promisor objects");
+			die(_("could not start pack-objects to repack promisor objects"));
 	}
 
 	xwrite(cmd->in, oid_to_hex(oid), GIT_SHA1_HEXSZ);
@@ -236,7 +236,7 @@ static void repack_promisor_objects(const struct pack_objects_args *args,
 		char *promisor_name;
 		int fd;
 		if (line.len != the_hash_algo->hexsz)
-			die("repack: Expecting full hex object ID lines only from pack-objects.");
+			die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 		string_list_append(names, line.buf);
 
 		/*
@@ -247,13 +247,13 @@ static void repack_promisor_objects(const struct pack_objects_args *args,
 					  line.buf);
 		fd = open(promisor_name, O_CREAT|O_EXCL|O_WRONLY, 0600);
 		if (fd < 0)
-			die_errno("unable to create '%s'", promisor_name);
+			die_errno(_("unable to create '%s'"), promisor_name);
 		close(fd);
 		free(promisor_name);
 	}
 	fclose(out);
 	if (finish_command(&cmd))
-		die("Could not finish pack-objects to repack promisor objects");
+		die(_("could not finish pack-objects to repack promisor objects"));
 }
 
 #define ALL_INTO_ONE 1
@@ -408,7 +408,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	out = xfdopen(cmd.out, "r");
 	while (strbuf_getline_lf(&line, out) != EOF) {
 		if (line.len != the_hash_algo->hexsz)
-			die("repack: Expecting full hex object ID lines only from pack-objects.");
+			die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 		string_list_append(&names, line.buf);
 	}
 	fclose(out);
@@ -417,7 +417,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		return ret;
 
 	if (!names.nr && !po_args.quiet)
-		printf("Nothing new to pack.\n");
+		printf_ln(_("Nothing new to pack."));
 
 	/*
 	 * Ok we have prepared all new packfiles.
@@ -476,13 +476,13 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		if (rollback_failure.nr) {
 			int i;
 			fprintf(stderr,
-				"WARNING: Some packs in use have been renamed by\n"
-				"WARNING: prefixing old- to their name, in order to\n"
-				"WARNING: replace them with the new version of the\n"
-				"WARNING: file.  But the operation failed, and the\n"
-				"WARNING: attempt to rename them back to their\n"
-				"WARNING: original names also failed.\n"
-				"WARNING: Please rename them in %s manually:\n", packdir);
+				_("WARNING: Some packs in use have been renamed by\n"
+				  "WARNING: prefixing old- to their name, in order to\n"
+				  "WARNING: replace them with the new version of the\n"
+				  "WARNING: file.  But the operation failed, and the\n"
+				  "WARNING: attempt to rename them back to their\n"
+				  "WARNING: original names also failed.\n"
+				  "WARNING: Please rename them in %s manually:\n"), packdir);
 			for (i = 0; i < rollback_failure.nr; i++)
 				fprintf(stderr, "WARNING:   old-%s -> %s\n",
 					rollback_failure.items[i].string,
diff --git a/builtin/revert.c b/builtin/revert.c
index c93393c..11190d2 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -69,7 +69,8 @@ static int option_parse_m(const struct option *opt,
 
 	replay->mainline = strtol(arg, &end, 10);
 	if (*end || replay->mainline <= 0)
-		return opterror(opt, "expects a number greater than zero", 0);
+		return error(_("option `%s' expects a number greater than zero"),
+			     opt->long_name);
 
 	return 0;
 }
diff --git a/git.c b/git.c
index 2f604a4..4d53a3d 100644
--- a/git.c
+++ b/git.c
@@ -338,27 +338,27 @@ static int handle_alias(int *argcp, const char ***argv)
 			if (ret >= 0)   /* normal exit */
 				exit(ret);
 
-			die_errno("while expanding alias '%s': '%s'",
-			    alias_command, alias_string + 1);
+			die_errno(_("while expanding alias '%s': '%s'"),
+				  alias_command, alias_string + 1);
 		}
 		count = split_cmdline(alias_string, &new_argv);
 		if (count < 0)
-			die("Bad alias.%s string: %s", alias_command,
-			    split_cmdline_strerror(count));
+			die(_("bad alias.%s string: %s"), alias_command,
+			    _(split_cmdline_strerror(count)));
 		option_count = handle_options(&new_argv, &count, &envchanged);
 		if (envchanged)
-			die("alias '%s' changes environment variables.\n"
-				 "You can use '!git' in the alias to do this",
-				 alias_command);
+			die(_("alias '%s' changes environment variables.\n"
+			      "You can use '!git' in the alias to do this"),
+			    alias_command);
 		memmove(new_argv - option_count, new_argv,
 				count * sizeof(char *));
 		new_argv -= option_count;
 
 		if (count < 1)
-			die("empty alias for %s", alias_command);
+			die(_("empty alias for %s"), alias_command);
 
 		if (!strcmp(alias_command, new_argv[0]))
-			die("recursive alias: %s", alias_command);
+			die(_("recursive alias: %s"), alias_command);
 
 		trace_argv_printf(new_argv,
 				  "trace: alias expansion: %s =>",
@@ -409,7 +409,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 	if (!help && get_super_prefix()) {
 		if (!(p->option & SUPPORT_SUPER_PREFIX))
-			die("%s doesn't support --super-prefix", p->cmd);
+			die(_("%s doesn't support --super-prefix"), p->cmd);
 	}
 
 	if (!help && p->option & NEED_WORK_TREE)
@@ -433,11 +433,11 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 	/* Check for ENOSPC and EIO errors.. */
 	if (fflush(stdout))
-		die_errno("write failure on standard output");
+		die_errno(_("write failure on standard output"));
 	if (ferror(stdout))
-		die("unknown write failure on standard output");
+		die(_("unknown write failure on standard output"));
 	if (fclose(stdout))
-		die_errno("close failed on standard output");
+		die_errno(_("close failed on standard output"));
 	return 0;
 }
 
@@ -654,7 +654,7 @@ static void execv_dashed_external(const char **argv)
 	int status;
 
 	if (get_super_prefix())
-		die("%s doesn't support --super-prefix", argv[0]);
+		die(_("%s doesn't support --super-prefix"), argv[0]);
 
 	if (use_pager == -1 && !is_builtin(argv[0]))
 		use_pager = check_pager_config(argv[0]);
@@ -766,7 +766,7 @@ int cmd_main(int argc, const char **argv)
 	if (skip_prefix(cmd, "git-", &cmd)) {
 		argv[0] = cmd;
 		handle_builtin(argc, argv);
-		die("cannot handle %s as a builtin", cmd);
+		die(_("cannot handle %s as a builtin"), cmd);
 	}
 
 	/* Look for flags.. */
@@ -779,7 +779,7 @@ int cmd_main(int argc, const char **argv)
 	} else {
 		/* The user didn't specify a command; give them help */
 		commit_pager_choice();
-		printf("usage: %s\n\n", git_usage_string);
+		printf(_("usage: %s\n\n"), git_usage_string);
 		list_common_cmds_help();
 		printf("\n%s\n", _(git_more_info_string));
 		exit(1);
diff --git a/parse-options-cb.c b/parse-options-cb.c
index 8c9edce..e2f3eae 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -18,7 +18,8 @@ int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 	} else {
 		v = strtol(arg, (char **)&arg, 10);
 		if (*arg)
-			return opterror(opt, "expects a numerical value", 0);
+			return error(_("option `%s' expects a numerical value"),
+				     opt->long_name);
 		if (v && v < MINIMUM_ABBREV)
 			v = MINIMUM_ABBREV;
 		else if (v > 40)
@@ -47,8 +48,8 @@ int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 		arg = unset ? "never" : (const char *)opt->defval;
 	value = git_config_colorbool(NULL, arg);
 	if (value < 0)
-		return opterror(opt,
-			"expects \"always\", \"auto\", or \"never\"", 0);
+		return error(_("option `%s' expects \"always\", \"auto\", or \"never\""),
+			     opt->long_name);
 	*(int *)opt->value = value;
 	return 0;
 }
diff --git a/parse-options.c b/parse-options.c
index 6932eaf..01c2acb 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -32,7 +32,7 @@ static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
 		p->argc--;
 		*arg = *++p->argv;
 	} else
-		return opterror(opt, "requires a value", flags);
+		return error(_("%s requires a value"), optname(opt, flags));
 	return 0;
 }
 
@@ -49,7 +49,6 @@ static int opt_command_mode_error(const struct option *opt,
 				  int flags)
 {
 	const struct option *that;
-	struct strbuf message = STRBUF_INIT;
 	struct strbuf that_name = STRBUF_INIT;
 
 	/*
@@ -67,13 +66,13 @@ static int opt_command_mode_error(const struct option *opt,
 			strbuf_addf(&that_name, "--%s", that->long_name);
 		else
 			strbuf_addf(&that_name, "-%c", that->short_name);
-		strbuf_addf(&message, ": incompatible with %s", that_name.buf);
+		error(_("%s is incompatible with %s"),
+		      optname(opt, flags), that_name.buf);
 		strbuf_release(&that_name);
-		opterror(opt, message.buf, flags);
-		strbuf_release(&message);
 		return -1;
 	}
-	return opterror(opt, ": incompatible with something else", flags);
+	return error(_("%s : incompatible with something else"),
+		     optname(opt, flags));
 }
 
 static int get_value(struct parse_opt_ctx_t *p,
@@ -86,11 +85,11 @@ static int get_value(struct parse_opt_ctx_t *p,
 	int err;
 
 	if (unset && p->opt)
-		return opterror(opt, "takes no value", flags);
+		return error(_("%s takes no value"), optname(opt, flags));
 	if (unset && (opt->flags & PARSE_OPT_NONEG))
-		return opterror(opt, "isn't available", flags);
+		return error(_("%s isn't available"), optname(opt, flags));
 	if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
-		return opterror(opt, "takes no value", flags);
+		return error(_("%s takes no value"), optname(opt, flags));
 
 	switch (opt->type) {
 	case OPTION_LOWLEVEL_CALLBACK:
@@ -176,7 +175,8 @@ static int get_value(struct parse_opt_ctx_t *p,
 			return -1;
 		*(int *)opt->value = strtol(arg, (char **)&s, 10);
 		if (*s)
-			return opterror(opt, "expects a numerical value", flags);
+			return error(_("%s expects a numerical value"),
+				     optname(opt, flags));
 		return 0;
 
 	case OPTION_MAGNITUDE:
@@ -191,13 +191,13 @@ static int get_value(struct parse_opt_ctx_t *p,
 		if (get_arg(p, opt, flags, &arg))
 			return -1;
 		if (!git_parse_ulong(arg, opt->value))
-			return opterror(opt,
-				"expects a non-negative integer value with an optional k/m/g suffix",
-				flags);
+			return error(_("%s expects a non-negative integer value"
+				       " with an optional k/m/g suffix"),
+				     optname(opt, flags));
 		return 0;
 
 	default:
-		die("should not happen, someone must be hit on the forehead");
+		BUG("opt->type %d should not happen", opt->type);
 	}
 }
 
@@ -257,7 +257,8 @@ again:
 			if (!rest)
 				continue;
 			if (*rest == '=')
-				return opterror(options, "takes no value", flags);
+				return error(_("%s takes no value"),
+					     optname(options, flags));
 			if (*rest)
 				continue;
 			p->out[p->cpidx++] = arg - 2;
@@ -318,8 +319,8 @@ is_abbreviated:
 	}
 
 	if (ambiguous_option) {
-		error("Ambiguous option: %s "
-			"(could be --%s%s or --%s%s)",
+		error(_("ambiguous option: %s "
+			"(could be --%s%s or --%s%s)"),
 			arg,
 			(ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 			ambiguous_option->long_name,
@@ -352,7 +353,7 @@ static void check_typos(const char *arg, const struct option *options)
 		return;
 
 	if (starts_with(arg, "no-")) {
-		error ("did you mean `--%s` (with two dashes ?)", arg);
+		error(_("did you mean `--%s` (with two dashes ?)"), arg);
 		exit(129);
 	}
 
@@ -360,7 +361,7 @@ static void check_typos(const char *arg, const struct option *options)
 		if (!options->long_name)
 			continue;
 		if (starts_with(options->long_name, arg)) {
-			error ("did you mean `--%s` (with two dashes ?)", arg);
+			error(_("did you mean `--%s` (with two dashes ?)"), arg);
 			exit(129);
 		}
 	}
@@ -423,7 +424,7 @@ void parse_options_start(struct parse_opt_ctx_t *ctx,
 	ctx->flags = flags;
 	if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 	    (flags & PARSE_OPT_STOP_AT_NON_OPTION))
-		die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
+		BUG("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 	parse_options_check(options);
 }
 
@@ -645,11 +646,11 @@ int parse_options(int argc, const char **argv, const char *prefix,
 		break;
 	default: /* PARSE_OPT_UNKNOWN */
 		if (ctx.argv[0][1] == '-') {
-			error("unknown option `%s'", ctx.argv[0] + 2);
+			error(_("unknown option `%s'"), ctx.argv[0] + 2);
 		} else if (isascii(*ctx.opt)) {
-			error("unknown switch `%c'", *ctx.opt);
+			error(_("unknown switch `%c'"), *ctx.opt);
 		} else {
-			error("unknown non-ascii option in string: `%s'",
+			error(_("unknown non-ascii option in string: `%s'"),
 			      ctx.argv[0]);
 		}
 		usage_with_options(usagestr, options);
@@ -775,12 +776,17 @@ void NORETURN usage_msg_opt(const char *msg,
 	usage_with_options(usagestr, options);
 }
 
-#undef opterror
-int opterror(const struct option *opt, const char *reason, int flags)
+const char *optname(const struct option *opt, int flags)
 {
+	static struct strbuf sb = STRBUF_INIT;
+
+	strbuf_reset(&sb);
 	if (flags & OPT_SHORT)
-		return error("switch `%c' %s", opt->short_name, reason);
-	if (flags & OPT_UNSET)
-		return error("option `no-%s' %s", opt->long_name, reason);
-	return error("option `%s' %s", opt->long_name, reason);
+		strbuf_addf(&sb, "switch `%c'", opt->short_name);
+	else if (flags & OPT_UNSET)
+		strbuf_addf(&sb, "option `no-%s'", opt->long_name);
+	else
+		strbuf_addf(&sb, "option `%s'", opt->long_name);
+
+	return sb.buf;
 }
diff --git a/parse-options.h b/parse-options.h
index a650a7d..81380c2 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -186,10 +186,7 @@ extern NORETURN void usage_msg_opt(const char *msg,
 				   const struct option *options);
 
 extern int optbug(const struct option *opt, const char *reason);
-extern int opterror(const struct option *opt, const char *reason, int flags);
-#if defined(__GNUC__)
-#define opterror(o,r,f) (opterror((o),(r),(f)), const_error())
-#endif
+const char *optname(const struct option *opt, int flags);
 
 /*
  * Use these assertions for callbacks that expect to be called with NONEG and
diff --git a/read-cache.c b/read-cache.c
index bd45dc3..68534a9 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -316,7 +316,7 @@ static int ce_match_stat_basic(const struct cache_entry *ce, struct stat *st)
 			changed |= DATA_CHANGED;
 		return changed;
 	default:
-		die("internal error: ce_mode is %o", ce->ce_mode);
+		BUG("unsupported ce_mode: %o", ce->ce_mode);
 	}
 
 	changed |= match_stat_data(&ce->ce_stat_data, st);
@@ -672,7 +672,8 @@ static struct cache_entry *create_alias_ce(struct index_state *istate,
 	struct cache_entry *new_entry;
 
 	if (alias->ce_flags & CE_ADDED)
-		die("Will not add file alias '%s' ('%s' already exists in index)", ce->name, alias->name);
+		die(_("will not add file alias '%s' ('%s' already exists in index)"),
+		    ce->name, alias->name);
 
 	/* Ok, create the new entry using the name of the existing alias */
 	len = ce_namelen(alias);
@@ -687,7 +688,7 @@ void set_object_name_for_intent_to_add_entry(struct cache_entry *ce)
 {
 	struct object_id oid;
 	if (write_object_file("", 0, blob_type, &oid))
-		die("cannot create an empty blob in the object database");
+		die(_("cannot create an empty blob in the object database"));
 	oidcpy(&ce->oid, &oid);
 }
 
@@ -708,7 +709,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
 		newflags |= HASH_RENORMALIZE;
 
 	if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
-		return error("%s: can only add regular files, symbolic links or git-directories", path);
+		return error(_("%s: can only add regular files, symbolic links or git-directories"), path);
 
 	namelen = strlen(path);
 	if (S_ISDIR(st_mode)) {
@@ -763,7 +764,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
 	if (!intent_only) {
 		if (index_path(istate, &ce->oid, path, st, newflags)) {
 			discard_cache_entry(ce);
-			return error("unable to index file %s", path);
+			return error(_("unable to index file '%s'"), path);
 		}
 	} else
 		set_object_name_for_intent_to_add_entry(ce);
@@ -782,7 +783,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
 		discard_cache_entry(ce);
 	else if (add_index_entry(istate, ce, add_option)) {
 		discard_cache_entry(ce);
-		return error("unable to add %s to index", path);
+		return error(_("unable to add '%s' to index"), path);
 	}
 	if (verbose && !was_same)
 		printf("add '%s'\n", path);
@@ -793,7 +794,7 @@ int add_file_to_index(struct index_state *istate, const char *path, int flags)
 {
 	struct stat st;
 	if (lstat(path, &st))
-		die_errno("unable to stat '%s'", path);
+		die_errno(_("unable to stat '%s'"), path);
 	return add_to_index(istate, path, &st, flags);
 }
 
@@ -818,7 +819,7 @@ struct cache_entry *make_cache_entry(struct index_state *istate,
 	int len;
 
 	if (!verify_path(path, mode)) {
-		error("Invalid path '%s'", path);
+		error(_("invalid path '%s'"), path);
 		return NULL;
 	}
 
@@ -844,7 +845,7 @@ struct cache_entry *make_transient_cache_entry(unsigned int mode, const struct o
 	int len;
 
 	if (!verify_path(path, mode)) {
-		error("Invalid path '%s'", path);
+		error(_("invalid path '%s'"), path);
 		return NULL;
 	}
 
@@ -1297,12 +1298,12 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
 	if (!ok_to_add)
 		return -1;
 	if (!verify_path(ce->name, ce->ce_mode))
-		return error("Invalid path '%s'", ce->name);
+		return error(_("invalid path '%s'"), ce->name);
 
 	if (!skip_df_check &&
 	    check_file_directory_conflict(istate, ce, pos, ok_to_replace)) {
 		if (!ok_to_replace)
-			return error("'%s' appears as both a file and as a directory",
+			return error(_("'%s' appears as both a file and as a directory"),
 				     ce->name);
 		pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
 		pos = -pos-1;
@@ -1491,11 +1492,11 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 						  istate->cache_nr);
 
 	trace_performance_enter();
-	modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n");
-	deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n");
-	typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n");
-	added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n");
-	unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n");
+	modified_fmt   = in_porcelain ? "M\t%s\n" : "%s: needs update\n";
+	deleted_fmt    = in_porcelain ? "D\t%s\n" : "%s: needs update\n";
+	typechange_fmt = in_porcelain ? "T\t%s\n" : "%s: needs update\n";
+	added_fmt      = in_porcelain ? "A\t%s\n" : "%s: needs update\n";
+	unmerged_fmt   = in_porcelain ? "U\t%s\n" : "%s: needs merge\n";
 	/*
 	 * Use the multi-threaded preload_index() to refresh most of the
 	 * cache entries quickly then in the single threaded loop below,
@@ -1682,10 +1683,10 @@ static int verify_hdr(const struct cache_header *hdr, unsigned long size)
 	int hdr_version;
 
 	if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
-		return error("bad signature");
+		return error(_("bad signature 0x%08x"), hdr->hdr_signature);
 	hdr_version = ntohl(hdr->hdr_version);
 	if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
-		return error("bad index version %d", hdr_version);
+		return error(_("bad index version %d"), hdr_version);
 
 	if (!verify_index_checksum)
 		return 0;
@@ -1694,7 +1695,7 @@ static int verify_hdr(const struct cache_header *hdr, unsigned long size)
 	the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
 	the_hash_algo->final_fn(hash, &c);
 	if (!hasheq(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
-		return error("bad index file sha1 signature");
+		return error(_("bad index file sha1 signature"));
 	return 0;
 }
 
@@ -1724,9 +1725,9 @@ static int read_index_extension(struct index_state *istate,
 		break;
 	default:
 		if (*ext < 'A' || 'Z' < *ext)
-			return error("index uses %.4s extension, which we do not understand",
+			return error(_("index uses %.4s extension, which we do not understand"),
 				     ext);
-		fprintf(stderr, "ignoring %.4s extension\n", ext);
+		fprintf_ln(stderr, _("ignoring %.4s extension"), ext);
 		break;
 	}
 	return 0;
@@ -1773,7 +1774,7 @@ static struct cache_entry *create_from_disk(struct mem_pool *ce_mem_pool,
 		extended_flags = get_be16(&ondisk2->flags2) << 16;
 		/* We do not yet understand any bit out of CE_EXTENDED_FLAGS */
 		if (extended_flags & ~CE_EXTENDED_FLAGS)
-			die("Unknown index entry format %08x", extended_flags);
+			die(_("unknown index entry format 0x%08x"), extended_flags);
 		flags |= extended_flags;
 		name = ondisk2->name;
 	}
@@ -1844,13 +1845,13 @@ static void check_ce_order(struct index_state *istate)
 		int name_compare = strcmp(ce->name, next_ce->name);
 
 		if (0 < name_compare)
-			die("unordered stage entries in index");
+			die(_("unordered stage entries in index"));
 		if (!name_compare) {
 			if (!ce_stage(ce))
-				die("multiple stage entries for merged file '%s'",
+				die(_("multiple stage entries for merged file '%s'"),
 				    ce->name);
 			if (ce_stage(ce) > ce_stage(next_ce))
-				die("unordered stage entries for '%s'",
+				die(_("unordered stage entries for '%s'"),
 				    ce->name);
 		}
 	}
@@ -2144,19 +2145,19 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
 	if (fd < 0) {
 		if (!must_exist && errno == ENOENT)
 			return 0;
-		die_errno("%s: index file open failed", path);
+		die_errno(_("%s: index file open failed"), path);
 	}
 
 	if (fstat(fd, &st))
-		die_errno("cannot stat the open index");
+		die_errno(_("%s: cannot stat the open index"), path);
 
 	mmap_size = xsize_t(st.st_size);
 	if (mmap_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
-		die("index file smaller than expected");
+		die(_("%s: index file smaller than expected"), path);
 
 	mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	if (mmap == MAP_FAILED)
-		die_errno("unable to map index file");
+		die_errno(_("%s: unable to map index file"), path);
 	close(fd);
 
 	hdr = (const struct cache_header *)mmap;
@@ -2235,7 +2236,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
 
 unmap:
 	munmap((void *)mmap, mmap_size);
-	die("index file corrupt");
+	die(_("index file corrupt"));
 }
 
 /*
@@ -2247,7 +2248,7 @@ unmap:
 static void freshen_shared_index(const char *shared_index, int warn)
 {
 	if (!check_and_freshen_file(shared_index, 1) && warn)
-		warning("could not freshen shared index '%s'", shared_index);
+		warning(_("could not freshen shared index '%s'"), shared_index);
 }
 
 int read_index_from(struct index_state *istate, const char *path,
@@ -2282,7 +2283,7 @@ int read_index_from(struct index_state *istate, const char *path,
 	base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex);
 	ret = do_read_index(split_index->base, base_path, 1);
 	if (!oideq(&split_index->base_oid, &split_index->base->oid))
-		die("broken index, expect %s in %s, got %s",
+		die(_("broken index, expect %s in %s, got %s"),
 		    base_oid_hex, base_path,
 		    oid_to_hex(&split_index->base->oid));
 
@@ -2348,14 +2349,14 @@ void validate_cache_entries(const struct index_state *istate)
 
 	for (i = 0; i < istate->cache_nr; i++) {
 		if (!istate) {
-			die("internal error: cache entry is not allocated from expected memory pool");
+			BUG("cache entry is not allocated from expected memory pool");
 		} else if (!istate->ce_mem_pool ||
 			!mem_pool_contains(istate->ce_mem_pool, istate->cache[i])) {
 			if (!istate->split_index ||
 				!istate->split_index->base ||
 				!istate->split_index->base->ce_mem_pool ||
 				!mem_pool_contains(istate->split_index->base->ce_mem_pool, istate->cache[i])) {
-				die("internal error: cache entry is not allocated from expected memory pool");
+				BUG("cache entry is not allocated from expected memory pool");
 			}
 		}
 	}
@@ -3096,7 +3097,7 @@ static int write_shared_index(struct index_state *istate,
 		return ret;
 	ret = adjust_shared_perm(get_tempfile_path(*temp));
 	if (ret) {
-		error("cannot fix permission bits on %s", get_tempfile_path(*temp));
+		error(_("cannot fix permission bits on '%s'"), get_tempfile_path(*temp));
 		return ret;
 	}
 	ret = rename_tempfile(temp,
@@ -3243,7 +3244,7 @@ int read_index_unmerged(struct index_state *istate)
 		new_ce->ce_namelen = len;
 		new_ce->ce_mode = ce->ce_mode;
 		if (add_index_entry(istate, new_ce, ADD_CACHE_SKIP_DFCHECK))
-			return error("%s: cannot drop to stage #0",
+			return error(_("%s: cannot drop to stage #0"),
 				     new_ce->name);
 	}
 	return unmerged;
diff --git a/ref-filter.c b/ref-filter.c
index 5de616b..75281c7 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2324,9 +2324,11 @@ int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
 
 	if (rf->merge) {
 		if (no_merged) {
-			return opterror(opt, "is incompatible with --merged", 0);
+			return error(_("option `%s' is incompatible with --merged"),
+				     opt->long_name);
 		} else {
-			return opterror(opt, "is incompatible with --no-merged", 0);
+			return error(_("option `%s' is incompatible with --no-merged"),
+				     opt->long_name);
 		}
 	}
 
@@ -2340,7 +2342,7 @@ int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
 	rf->merge_commit = lookup_commit_reference_gently(the_repository,
 							  &oid, 0);
 	if (!rf->merge_commit)
-		return opterror(opt, "must point to a commit", 0);
+		return error(_("option `%s' must point to a commit"), opt->long_name);
 
 	return 0;
 }
diff --git a/remote.c b/remote.c
index b850f2f..70aba02 100644
--- a/remote.c
+++ b/remote.c
@@ -359,7 +359,7 @@ static int handle_config(const char *key, const char *value, void *cb)
 		return 0;
 	/* Handle remote.<name>.* variables */
 	if (*name == '/') {
-		warning("Config remote shorthand cannot begin with '/': %s",
+		warning(_("config remote shorthand cannot begin with '/': %s"),
 			name);
 		return 0;
 	}
@@ -406,7 +406,7 @@ static int handle_config(const char *key, const char *value, void *cb)
 		if (!remote->receivepack)
 			remote->receivepack = v;
 		else
-			error("more than one receivepack given, using the first");
+			error(_("more than one receivepack given, using the first"));
 	} else if (!strcmp(subkey, "uploadpack")) {
 		const char *v;
 		if (git_config_string(&v, key, value))
@@ -414,7 +414,7 @@ static int handle_config(const char *key, const char *value, void *cb)
 		if (!remote->uploadpack)
 			remote->uploadpack = v;
 		else
-			error("more than one uploadpack given, using the first");
+			error(_("more than one uploadpack given, using the first"));
 	} else if (!strcmp(subkey, "tagopt")) {
 		if (!strcmp(value, "--no-tags"))
 			remote->fetch_tags = -1;
@@ -620,7 +620,7 @@ static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 			 * FETCH_HEAD_IGNORE entries always appear at
 			 * the end of the list.
 			 */
-			die(_("Internal error"));
+			BUG("Internal error");
 		}
 	}
 	free(ref2->peer_ref);
@@ -680,7 +680,7 @@ static int match_name_with_pattern(const char *key, const char *name,
 	size_t namelen;
 	int ret;
 	if (!kstar)
-		die("Key '%s' of pattern had no '*'", key);
+		die(_("key '%s' of pattern had no '*'"), key);
 	klen = kstar - key;
 	ksuffixlen = strlen(kstar + 1);
 	namelen = strlen(name);
@@ -690,7 +690,7 @@ static int match_name_with_pattern(const char *key, const char *name,
 		struct strbuf sb = STRBUF_INIT;
 		const char *vstar = strchr(value, '*');
 		if (!vstar)
-			die("Value '%s' of pattern has no '*'", value);
+			die(_("value '%s' of pattern has no '*'"), value);
 		strbuf_add(&sb, value, vstar - value);
 		strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
 		strbuf_addstr(&sb, vstar + 1);
@@ -707,7 +707,7 @@ static void query_refspecs_multiple(struct refspec *rs,
 	int find_src = !query->src;
 
 	if (find_src && !query->dst)
-		error("query_refspecs_multiple: need either src or dst");
+		BUG("query_refspecs_multiple: need either src or dst");
 
 	for (i = 0; i < rs->nr; i++) {
 		struct refspec_item *refspec = &rs->items[i];
@@ -735,7 +735,7 @@ int query_refspecs(struct refspec *rs, struct refspec_item *query)
 	char **result = find_src ? &query->src : &query->dst;
 
 	if (find_src && !query->dst)
-		return error("query_refspecs: need either src or dst");
+		BUG("query_refspecs: need either src or dst");
 
 	for (i = 0; i < rs->nr; i++) {
 		struct refspec_item *refspec = &rs->items[i];
@@ -995,12 +995,12 @@ static int match_explicit_lhs(struct ref *src,
 		 * way to delete 'other' ref at the remote end.
 		 */
 		if (try_explicit_object_name(rs->src, match) < 0)
-			return error("src refspec %s does not match any.", rs->src);
+			return error(_("src refspec %s does not match any"), rs->src);
 		if (allocated_match)
 			*allocated_match = 1;
 		return 0;
 	default:
-		return error("src refspec %s matches more than one.", rs->src);
+		return error(_("src refspec %s matches more than one"), rs->src);
 	}
 }
 
@@ -1030,7 +1030,7 @@ static int match_explicit(struct ref *src, struct ref *dst,
 		if (!dst_value ||
 		    ((flag & REF_ISSYMREF) &&
 		     !starts_with(dst_value, "refs/heads/")))
-			die("%s cannot be resolved to branch.",
+			die(_("%s cannot be resolved to branch"),
 			    matched_src->name);
 	}
 
@@ -1041,30 +1041,30 @@ static int match_explicit(struct ref *src, struct ref *dst,
 		if (starts_with(dst_value, "refs/"))
 			matched_dst = make_linked_ref(dst_value, dst_tail);
 		else if (is_null_oid(&matched_src->new_oid))
-			error("unable to delete '%s': remote ref does not exist",
+			error(_("unable to delete '%s': remote ref does not exist"),
 			      dst_value);
 		else if ((dst_guess = guess_ref(dst_value, matched_src))) {
 			matched_dst = make_linked_ref(dst_guess, dst_tail);
 			free(dst_guess);
 		} else
-			error("unable to push to unqualified destination: %s\n"
-			      "The destination refspec neither matches an "
-			      "existing ref on the remote nor\n"
-			      "begins with refs/, and we are unable to "
-			      "guess a prefix based on the source ref.",
+			error(_("unable to push to unqualified destination: %s\n"
+				"The destination refspec neither matches an "
+				"existing ref on the remote nor\n"
+				"begins with refs/, and we are unable to "
+				"guess a prefix based on the source ref."),
 			      dst_value);
 		break;
 	default:
 		matched_dst = NULL;
-		error("dst refspec %s matches more than one.",
+		error(_("dst refspec %s matches more than one"),
 		      dst_value);
 		break;
 	}
 	if (!matched_dst)
 		return -1;
 	if (matched_dst->peer_ref)
-		return error("dst ref %s receives from more than one src.",
-		      matched_dst->name);
+		return error(_("dst ref %s receives from more than one src"),
+			     matched_dst->name);
 	else {
 		matched_dst->peer_ref = allocated_src ?
 					matched_src :
@@ -1782,7 +1782,7 @@ int get_fetch_map(const struct ref *remote_refs,
 			ref_map = get_remote_ref(remote_refs, name);
 		}
 		if (!missing_ok && !ref_map)
-			die("Couldn't find remote ref %s", name);
+			die(_("couldn't find remote ref %s"), name);
 		if (ref_map) {
 			ref_map->peer_ref = get_local_ref(refspec->dst);
 			if (ref_map->peer_ref && refspec->force)
@@ -1795,7 +1795,7 @@ int get_fetch_map(const struct ref *remote_refs,
 			if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
 			    check_refname_format((*rmp)->peer_ref->name, 0)) {
 				struct ref *ignore = *rmp;
-				error("* Ignoring funny ref '%s' locally",
+				error(_("* Ignoring funny ref '%s' locally"),
 				      (*rmp)->peer_ref->name);
 				*rmp = (*rmp)->next;
 				free(ignore->peer_ref);
@@ -1890,7 +1890,7 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
 	repo_init_revisions(the_repository, &revs, NULL);
 	setup_revisions(argv.argc, argv.argv, &revs, NULL);
 	if (prepare_revision_walk(&revs))
-		die("revision walk setup failed");
+		die(_("revision walk setup failed"));
 
 	/* ... and count the commits on each side. */
 	while (1) {
@@ -2163,7 +2163,8 @@ static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, i
 	else if (!colon[1])
 		oidclr(&entry->expect);
 	else if (get_oid(colon + 1, &entry->expect))
-		return error("cannot parse expected object name '%s'", colon + 1);
+		return error(_("cannot parse expected object name '%s'"),
+			     colon + 1);
 	return 0;
 }
 
diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index f5b1086..b8f366c 100755
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -227,7 +227,7 @@ EOF
 test_expect_success 'detect possible typos' '
 	test_must_fail test-tool parse-options -boolean >output 2>output.err &&
 	test_must_be_empty output &&
-	test_cmp typo.err output.err
+	test_i18ncmp typo.err output.err
 '
 
 cat >typo.err <<\EOF
@@ -237,7 +237,7 @@ EOF
 test_expect_success 'detect possible typos' '
 	test_must_fail test-tool parse-options -ambiguous >output 2>output.err &&
 	test_must_be_empty output &&
-	test_cmp typo.err output.err
+	test_i18ncmp typo.err output.err
 '
 
 test_expect_success 'keep some options as arguments' '
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 3e05353..ae8a448 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -20,12 +20,12 @@ check_have () {
 }
 
 check_fsck () {
-	output=$(git fsck --full)
+	git fsck --full >fsck.output
 	case "$1" in
 	'')
-		test -z "$output" ;;
+		test_must_be_empty fsck.output ;;
 	*)
-		echo "$output" | grep "$1" ;;
+		test_i18ngrep "$1" fsck.output ;;
 	esac
 }
 
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index e20e8fa..2e5e979 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -70,7 +70,7 @@ test_expect_success 'object with bad sha1' '
 
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "$sha.*corrupt" out
+	test_i18ngrep "$sha.*corrupt" out
 '
 
 test_expect_success 'branch pointing to non-commit' '
@@ -78,7 +78,7 @@ test_expect_success 'branch pointing to non-commit' '
 	test_when_finished "git update-ref -d refs/heads/invalid" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "not a commit" out
+	test_i18ngrep "not a commit" out
 '
 
 test_expect_success 'HEAD link pointing at a funny object' '
@@ -88,7 +88,7 @@ test_expect_success 'HEAD link pointing at a funny object' '
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
 	cat out &&
-	grep "detached HEAD points" out
+	test_i18ngrep "detached HEAD points" out
 '
 
 test_expect_success 'HEAD link pointing at a funny place' '
@@ -98,7 +98,7 @@ test_expect_success 'HEAD link pointing at a funny place' '
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
 	cat out &&
-	grep "HEAD points to something strange" out
+	test_i18ngrep "HEAD points to something strange" out
 '
 
 test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
@@ -109,7 +109,7 @@ test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail git -C wt fsck 2>out &&
-	grep "main-worktree/HEAD: detached HEAD points" out
+	test_i18ngrep "main-worktree/HEAD: detached HEAD points" out
 '
 
 test_expect_success 'other worktree HEAD link pointing at a funny object' '
@@ -117,7 +117,7 @@ test_expect_success 'other worktree HEAD link pointing at a funny object' '
 	git worktree add other &&
 	echo $ZERO_OID >.git/worktrees/other/HEAD &&
 	test_must_fail git fsck 2>out &&
-	grep "worktrees/other/HEAD: detached HEAD points" out
+	test_i18ngrep "worktrees/other/HEAD: detached HEAD points" out
 '
 
 test_expect_success 'other worktree HEAD link pointing at missing object' '
@@ -125,7 +125,7 @@ test_expect_success 'other worktree HEAD link pointing at missing object' '
 	git worktree add other &&
 	echo "Contents missing from repo" | git hash-object --stdin >.git/worktrees/other/HEAD &&
 	test_must_fail git fsck 2>out &&
-	grep "worktrees/other/HEAD: invalid sha1 pointer" out
+	test_i18ngrep "worktrees/other/HEAD: invalid sha1 pointer" out
 '
 
 test_expect_success 'other worktree HEAD link pointing at a funny place' '
@@ -133,7 +133,7 @@ test_expect_success 'other worktree HEAD link pointing at a funny place' '
 	git worktree add other &&
 	echo "ref: refs/funny/place" >.git/worktrees/other/HEAD &&
 	test_must_fail git fsck 2>out &&
-	grep "worktrees/other/HEAD points to something strange" out
+	test_i18ngrep "worktrees/other/HEAD points to something strange" out
 '
 
 test_expect_success 'email without @ is okay' '
@@ -157,7 +157,7 @@ test_expect_success 'email with embedded > is not okay' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new" out
+	test_i18ngrep "error in commit $new" out
 '
 
 test_expect_success 'missing < email delimiter is reported nicely' '
@@ -169,7 +169,7 @@ test_expect_success 'missing < email delimiter is reported nicely' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new.* - bad name" out
+	test_i18ngrep "error in commit $new.* - bad name" out
 '
 
 test_expect_success 'missing email is reported nicely' '
@@ -181,7 +181,7 @@ test_expect_success 'missing email is reported nicely' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new.* - missing email" out
+	test_i18ngrep "error in commit $new.* - missing email" out
 '
 
 test_expect_success '> in name is reported' '
@@ -193,7 +193,7 @@ test_expect_success '> in name is reported' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new" out
+	test_i18ngrep "error in commit $new" out
 '
 
 # date is 2^64 + 1
@@ -207,7 +207,7 @@ test_expect_success 'integer overflow in timestamps is reported' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new.*integer overflow" out
+	test_i18ngrep "error in commit $new.*integer overflow" out
 '
 
 test_expect_success 'commit with NUL in header' '
@@ -219,7 +219,7 @@ test_expect_success 'commit with NUL in header' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
 	cat out &&
-	grep "error in commit $new.*unterminated header: NUL at offset" out
+	test_i18ngrep "error in commit $new.*unterminated header: NUL at offset" out
 '
 
 test_expect_success 'tree object with duplicate entries' '
@@ -240,7 +240,7 @@ test_expect_success 'tree object with duplicate entries' '
 		git hash-object -w -t tree --stdin
 	) &&
 	test_must_fail git fsck 2>out &&
-	grep "error in tree .*contains duplicate file entries" out
+	test_i18ngrep "error in tree .*contains duplicate file entries" out
 '
 
 test_expect_success 'unparseable tree object' '
@@ -294,7 +294,7 @@ test_expect_success 'tag pointing to nonexistent' '
 	test_when_finished "git update-ref -d refs/tags/invalid" &&
 	test_must_fail git fsck --tags >out &&
 	cat out &&
-	grep "broken link" out
+	test_i18ngrep "broken link" out
 '
 
 test_expect_success 'tag pointing to something else than its type' '
@@ -336,7 +336,7 @@ test_expect_success 'tag with incorrect tag name & missing tagger' '
 	warning in tag $tag: badTagName: invalid '\''tag'\'' name: wrong name format
 	warning in tag $tag: missingTaggerEntry: invalid format - expected '\''tagger'\'' line
 	EOF
-	test_cmp expect out
+	test_i18ncmp expect out
 '
 
 test_expect_success 'tag with bad tagger' '
@@ -355,7 +355,7 @@ test_expect_success 'tag with bad tagger' '
 	echo $tag >.git/refs/tags/wrong &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
-	grep "error in tag .*: invalid author/committer" out
+	test_i18ngrep "error in tag .*: invalid author/committer" out
 '
 
 test_expect_success 'tag with NUL in header' '
@@ -375,7 +375,7 @@ test_expect_success 'tag with NUL in header' '
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
 	cat out &&
-	grep "error in tag $tag.*unterminated header: NUL at offset" out
+	test_i18ngrep "error in tag $tag.*unterminated header: NUL at offset" out
 '
 
 test_expect_success 'cleaned up' '
@@ -431,7 +431,7 @@ test_expect_success 'fsck notices blob entry pointing to null sha1' '
 	       git hash-object -w --stdin -t tree) &&
 	  git fsck 2>out &&
 	  cat out &&
-	  grep "warning.*null sha1" out
+	  test_i18ngrep "warning.*null sha1" out
 	)
 '
 
@@ -442,7 +442,7 @@ test_expect_success 'fsck notices submodule entry pointing to null sha1' '
 	       git hash-object -w --stdin -t tree) &&
 	  git fsck 2>out &&
 	  cat out &&
-	  grep "warning.*null sha1" out
+	  test_i18ngrep "warning.*null sha1" out
 	)
 '
 
@@ -463,7 +463,7 @@ while read name path pretty; do
 			bad_tree=$(git mktree <bad) &&
 			git fsck 2>out &&
 			cat out &&
-			grep "warning.*tree $bad_tree" out
+			test_i18ngrep "warning.*tree $bad_tree" out
 		)'
 	done <<-\EOF
 	100644 blob
@@ -509,9 +509,9 @@ test_expect_success 'NUL in commit' '
 		git branch bad $(cat name) &&
 
 		test_must_fail git -c fsck.nulInCommit=error fsck 2>warn.1 &&
-		grep nulInCommit warn.1 &&
+		test_i18ngrep nulInCommit warn.1 &&
 		git fsck 2>warn.2 &&
-		grep nulInCommit warn.2
+		test_i18ngrep nulInCommit warn.2
 	)
 '
 
@@ -629,7 +629,7 @@ test_expect_success 'fsck --name-objects' '
 		remove_object $(git rev-parse julius:caesar.t) &&
 		test_must_fail git fsck --name-objects >out &&
 		tree=$(git rev-parse --verify julius:) &&
-		egrep "$tree \((refs/heads/master|HEAD)@\{[0-9]*\}:" out
+		test_i18ngrep -E "$tree \((refs/heads/master|HEAD)@\{[0-9]*\}:" out
 	)
 '
 
@@ -640,7 +640,7 @@ test_expect_success 'alternate objects are correctly blamed' '
 	mkdir alt.git/objects/12 &&
 	>alt.git/objects/12/34567890123456789012345678901234567890 &&
 	test_must_fail git fsck >out 2>&1 &&
-	grep alt.git out
+	test_i18ngrep alt.git out
 '
 
 test_expect_success 'fsck errors in packed objects' '
@@ -659,8 +659,8 @@ test_expect_success 'fsck errors in packed objects' '
 	remove_object $one &&
 	remove_object $two &&
 	test_must_fail git fsck 2>out &&
-	grep "error in commit $one.* - bad name" out &&
-	grep "error in commit $two.* - bad name" out &&
+	test_i18ngrep "error in commit $one.* - bad name" out &&
+	test_i18ngrep "error in commit $two.* - bad name" out &&
 	! grep corrupt out
 '
 
@@ -760,7 +760,7 @@ test_expect_success 'fsck notices dangling objects' '
 		git fsck >actual &&
 		# the output order is non-deterministic, as it comes from a hash
 		sort <actual >actual.sorted &&
-		test_cmp expect actual.sorted
+		test_i18ncmp expect actual.sorted
 	)
 '
 
@@ -808,7 +808,7 @@ test_expect_success 'detect corrupt index file in fsck' '
 	test_when_finished "mv .git/index.backup .git/index" &&
 	corrupt_index_checksum &&
 	test_must_fail git fsck --cache 2>errors &&
-	grep "bad index file" errors
+	test_i18ngrep "bad index file" errors
 '
 
 test_done
diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index ef13221..bd5fe4d 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -25,7 +25,7 @@ canned_test_failure () {
 test_bad_opts () {
 	test_expect_success "invalid args: $1" "
 		test_must_fail git log $1 2>errors &&
-		grep '$2' errors
+		test_i18ngrep '$2' errors
 	"
 }
 
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 336f02a..9643acb 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -281,7 +281,7 @@ test_expect_success 'upon cloning, check that all refs point to objects' '
 	test_must_fail git -c protocol.version=2 clone \
 		--filter=blob:none $HTTPD_URL/one_time_sed/server repo 2>err &&
 
-	grep "did not send all necessary objects" err &&
+	test_i18ngrep "did not send all necessary objects" err &&
 
 	# Ensure that the one-time-sed script was used.
 	! test -e "$HTTPD_ROOT_PATH/one-time-sed"
diff --git a/t/t5703-upload-pack-ref-in-want.sh b/t/t5703-upload-pack-ref-in-want.sh
index 3f58f05..7053899 100755
--- a/t/t5703-upload-pack-ref-in-want.sh
+++ b/t/t5703-upload-pack-ref-in-want.sh
@@ -208,7 +208,7 @@ test_expect_success 'server is initially ahead - no ref in want' '
 	cp -r "$LOCAL_PRISTINE" local &&
 	inconsistency master 1234567890123456789012345678901234567890 &&
 	test_must_fail git -C local fetch 2>err &&
-	grep "ERR upload-pack: not our ref" err
+	test_i18ngrep "ERR upload-pack: not our ref" err
 '
 
 test_expect_success 'server is initially ahead - ref in want' '
@@ -254,7 +254,7 @@ test_expect_success 'server loses a ref - ref in want' '
 	echo "s/master/raster/" >"$HTTPD_ROOT_PATH/one-time-sed" &&
 	test_must_fail git -C local fetch 2>err &&
 
-	grep "ERR unknown ref refs/heads/raster" err
+	test_i18ngrep "ERR unknown ref refs/heads/raster" err
 '
 
 stop_httpd
diff --git a/t/t6050-replace.sh b/t/t6050-replace.sh
index 5d6d318..d638119 100755
--- a/t/t6050-replace.sh
+++ b/t/t6050-replace.sh
@@ -133,8 +133,8 @@ test_expect_success 'tag replaced commit' '
 
 test_expect_success '"git fsck" works' '
      git fsck master >fsck_master.out &&
-     grep "dangling commit $R" fsck_master.out &&
-     grep "dangling tag $(cat .git/refs/tags/mytag)" fsck_master.out &&
+     test_i18ngrep "dangling commit $R" fsck_master.out &&
+     test_i18ngrep "dangling tag $(cat .git/refs/tags/mytag)" fsck_master.out &&
      test -z "$(git fsck)"
 '
 
diff --git a/t/t7415-submodule-names.sh b/t/t7415-submodule-names.sh
index 293e2e1..49a37ef 100755
--- a/t/t7415-submodule-names.sh
+++ b/t/t7415-submodule-names.sh
@@ -154,7 +154,7 @@ test_expect_success 'fsck detects symlinked .gitmodules file' '
 		# symlink detector; this grep string comes from the config
 		# variable name and will not be translated.
 		test_must_fail git fsck 2>output &&
-		grep gitmodulesSymlink output
+		test_i18ngrep gitmodulesSymlink output
 	)
 '
 
@@ -172,7 +172,7 @@ test_expect_success 'fsck detects non-blob .gitmodules' '
 		git ls-tree HEAD | sed s/subdir/.gitmodules/ | git mktree &&
 
 		test_must_fail git fsck 2>output &&
-		grep gitmodulesBlob output
+		test_i18ngrep gitmodulesBlob output
 	)
 '
 
@@ -186,7 +186,7 @@ test_expect_success 'fsck detects corrupt .gitmodules' '
 		git commit -m "broken gitmodules" &&
 
 		git fsck 2>output &&
-		grep gitmodulesParse output &&
+		test_i18ngrep gitmodulesParse output &&
 		test_i18ngrep ! "bad config" output
 	)
 '