Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 1039 insertions, 0 deletions

diff --git a/builtin/notes.c b/builtin/notes.c
new file mode 100644
index 000000000000..02e97f55c5a0
--- /dev/null
+++ b/builtin/notes.c
@@ -0,0 +1,1039 @@
+/*
+ * Builtin "git notes"
+ *
+ * Copyright (c) 2010 Johan Herland <johan@herland.net>
+ *
+ * Based on git-notes.sh by Johannes Schindelin,
+ * and builtin/tag.c by Kristian Høgsberg and Carlos Rica.
+ */
+
+#include "cache.h"
+#include "config.h"
+#include "builtin.h"
+#include "notes.h"
+#include "object-store.h"
+#include "repository.h"
+#include "blob.h"
+#include "pretty.h"
+#include "refs.h"
+#include "exec-cmd.h"
+#include "run-command.h"
+#include "parse-options.h"
+#include "string-list.h"
+#include "notes-merge.h"
+#include "notes-utils.h"
+#include "worktree.h"
+
+static const char * const git_notes_usage[] = {
+	N_("git notes [--ref <notes-ref>] [list [<object>]]"),
+	N_("git notes [--ref <notes-ref>] add [-f] [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
+	N_("git notes [--ref <notes-ref>] copy [-f] <from-object> <to-object>"),
+	N_("git notes [--ref <notes-ref>] append [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
+	N_("git notes [--ref <notes-ref>] edit [--allow-empty] [<object>]"),
+	N_("git notes [--ref <notes-ref>] show [<object>]"),
+	N_("git notes [--ref <notes-ref>] merge [-v | -q] [-s <strategy>] <notes-ref>"),
+	N_("git notes merge --commit [-v | -q]"),
+	N_("git notes merge --abort [-v | -q]"),
+	N_("git notes [--ref <notes-ref>] remove [<object>...]"),
+	N_("git notes [--ref <notes-ref>] prune [-n] [-v]"),
+	N_("git notes [--ref <notes-ref>] get-ref"),
+	NULL
+};
+
+static const char * const git_notes_list_usage[] = {
+	N_("git notes [list [<object>]]"),
+	NULL
+};
+
+static const char * const git_notes_add_usage[] = {
+	N_("git notes add [<options>] [<object>]"),
+	NULL
+};
+
+static const char * const git_notes_copy_usage[] = {
+	N_("git notes copy [<options>] <from-object> <to-object>"),
+	N_("git notes copy --stdin [<from-object> <to-object>]..."),
+	NULL
+};
+
+static const char * const git_notes_append_usage[] = {
+	N_("git notes append [<options>] [<object>]"),
+	NULL
+};
+
+static const char * const git_notes_edit_usage[] = {
+	N_("git notes edit [<object>]"),
+	NULL
+};
+
+static const char * const git_notes_show_usage[] = {
+	N_("git notes show [<object>]"),
+	NULL
+};
+
+static const char * const git_notes_merge_usage[] = {
+	N_("git notes merge [<options>] <notes-ref>"),
+	N_("git notes merge --commit [<options>]"),
+	N_("git notes merge --abort [<options>]"),
+	NULL
+};
+
+static const char * const git_notes_remove_usage[] = {
+	N_("git notes remove [<object>]"),
+	NULL
+};
+
+static const char * const git_notes_prune_usage[] = {
+	N_("git notes prune [<options>]"),
+	NULL
+};
+
+static const char * const git_notes_get_ref_usage[] = {
+	N_("git notes get-ref"),
+	NULL
+};
+
+static const char note_template[] =
+	N_("Write/edit the notes for the following object:");
+
+struct note_data {
+	int given;
+	int use_editor;
+	char *edit_path;
+	struct strbuf buf;
+};
+
+static void free_note_data(struct note_data *d)
+{
+	if (d->edit_path) {
+		unlink_or_warn(d->edit_path);
+		free(d->edit_path);
+	}
+	strbuf_release(&d->buf);
+}
+
+static int list_each_note(const struct object_id *object_oid,
+		const struct object_id *note_oid, char *note_path,
+		void *cb_data)
+{
+	printf("%s %s\n", oid_to_hex(note_oid), oid_to_hex(object_oid));
+	return 0;
+}
+
+static void copy_obj_to_fd(int fd, const struct object_id *oid)
+{
+	unsigned long size;
+	enum object_type type;
+	char *buf = read_object_file(oid, &type, &size);
+	if (buf) {
+		if (size)
+			write_or_die(fd, buf, size);
+		free(buf);
+	}
+}
+
+static void write_commented_object(int fd, const struct object_id *object)
+{
+	const char *show_args[5] =
+		{"show", "--stat", "--no-notes", oid_to_hex(object), NULL};
+	struct child_process show = CHILD_PROCESS_INIT;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf cbuf = STRBUF_INIT;
+
+	/* Invoke "git show --stat --no-notes $object" */
+	show.argv = show_args;
+	show.no_stdin = 1;
+	show.out = -1;
+	show.err = 0;
+	show.git_cmd = 1;
+	if (start_command(&show))
+		die(_("unable to start 'show' for object '%s'"),
+		    oid_to_hex(object));
+
+	if (strbuf_read(&buf, show.out, 0) < 0)
+		die_errno(_("could not read 'show' output"));
+	strbuf_add_commented_lines(&cbuf, buf.buf, buf.len);
+	write_or_die(fd, cbuf.buf, cbuf.len);
+
+	strbuf_release(&cbuf);
+	strbuf_release(&buf);
+
+	if (finish_command(&show))
+		die(_("failed to finish 'show' for object '%s'"),
+		    oid_to_hex(object));
+}
+
+static void prepare_note_data(const struct object_id *object, struct note_data *d,
+		const struct object_id *old_note)
+{
+	if (d->use_editor || !d->given) {
+		int fd;
+		struct strbuf buf = STRBUF_INIT;
+
+		/* write the template message before editing: */
+		d->edit_path = git_pathdup("NOTES_EDITMSG");
+		fd = open(d->edit_path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+		if (fd < 0)
+			die_errno(_("could not create file '%s'"), d->edit_path);
+
+		if (d->given)
+			write_or_die(fd, d->buf.buf, d->buf.len);
+		else if (old_note)
+			copy_obj_to_fd(fd, old_note);
+
+		strbuf_addch(&buf, '\n');
+		strbuf_add_commented_lines(&buf, "\n", strlen("\n"));
+		strbuf_add_commented_lines(&buf, _(note_template), strlen(_(note_template)));
+		strbuf_addch(&buf, '\n');
+		write_or_die(fd, buf.buf, buf.len);
+
+		write_commented_object(fd, object);
+
+		close(fd);
+		strbuf_release(&buf);
+		strbuf_reset(&d->buf);
+
+		if (launch_editor(d->edit_path, &d->buf, NULL)) {
+			die(_("please supply the note contents using either -m or -F option"));
+		}
+		strbuf_stripspace(&d->buf, 1);
+	}
+}
+
+static void write_note_data(struct note_data *d, struct object_id *oid)
+{
+	if (write_object_file(d->buf.buf, d->buf.len, blob_type, oid)) {
+		error(_("unable to write note object"));
+		if (d->edit_path)
+			error(_("the note contents have been left in %s"),
+				d->edit_path);
+		exit(128);
+	}
+}
+
+static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
+{
+	struct note_data *d = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	strbuf_grow(&d->buf, strlen(arg) + 2);
+	if (d->buf.len)
+		strbuf_addch(&d->buf, '\n');
+	strbuf_addstr(&d->buf, arg);
+	strbuf_stripspace(&d->buf, 0);
+
+	d->given = 1;
+	return 0;
+}
+
+static int parse_file_arg(const struct option *opt, const char *arg, int unset)
+{
+	struct note_data *d = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (d->buf.len)
+		strbuf_addch(&d->buf, '\n');
+	if (!strcmp(arg, "-")) {
+		if (strbuf_read(&d->buf, 0, 1024) < 0)
+			die_errno(_("cannot read '%s'"), arg);
+	} else if (strbuf_read_file(&d->buf, arg, 1024) < 0)
+		die_errno(_("could not open or read '%s'"), arg);
+	strbuf_stripspace(&d->buf, 0);
+
+	d->given = 1;
+	return 0;
+}
+
+static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
+{
+	struct note_data *d = opt->value;
+	char *buf;
+	struct object_id object;
+	enum object_type type;
+	unsigned long len;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (d->buf.len)
+		strbuf_addch(&d->buf, '\n');
+
+	if (get_oid(arg, &object))
+		die(_("failed to resolve '%s' as a valid ref."), arg);
+	if (!(buf = read_object_file(&object, &type, &len)))
+		die(_("failed to read object '%s'."), arg);
+	if (type != OBJ_BLOB) {
+		free(buf);
+		die(_("cannot read note data from non-blob object '%s'."), arg);
+	}
+	strbuf_add(&d->buf, buf, len);
+	free(buf);
+
+	d->given = 1;
+	return 0;
+}
+
+static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
+{
+	struct note_data *d = opt->value;
+	BUG_ON_OPT_NEG(unset);
+	d->use_editor = 1;
+	return parse_reuse_arg(opt, arg, unset);
+}
+
+static int notes_copy_from_stdin(int force, const char *rewrite_cmd)
+{
+	struct strbuf buf = STRBUF_INIT;
+	struct notes_rewrite_cfg *c = NULL;
+	struct notes_tree *t = NULL;
+	int ret = 0;
+	const char *msg = "Notes added by 'git notes copy'";
+
+	if (rewrite_cmd) {
+		c = init_copy_notes_for_rewrite(rewrite_cmd);
+		if (!c)
+			return 0;
+	} else {
+		init_notes(NULL, NULL, NULL, NOTES_INIT_WRITABLE);
+		t = &default_notes_tree;
+	}
+
+	while (strbuf_getline_lf(&buf, stdin) != EOF) {
+		struct object_id from_obj, to_obj;
+		struct strbuf **split;
+		int err;
+
+		split = strbuf_split(&buf, ' ');
+		if (!split[0] || !split[1])
+			die(_("malformed input line: '%s'."), buf.buf);
+		strbuf_rtrim(split[0]);
+		strbuf_rtrim(split[1]);
+		if (get_oid(split[0]->buf, &from_obj))
+			die(_("failed to resolve '%s' as a valid ref."), split[0]->buf);
+		if (get_oid(split[1]->buf, &to_obj))
+			die(_("failed to resolve '%s' as a valid ref."), split[1]->buf);
+
+		if (rewrite_cmd)
+			err = copy_note_for_rewrite(c, &from_obj, &to_obj);
+		else
+			err = copy_note(t, &from_obj, &to_obj, force,
+					combine_notes_overwrite);
+
+		if (err) {
+			error(_("failed to copy notes from '%s' to '%s'"),
+			      split[0]->buf, split[1]->buf);
+			ret = 1;
+		}
+
+		strbuf_list_free(split);
+	}
+
+	if (!rewrite_cmd) {
+		commit_notes(the_repository, t, msg);
+		free_notes(t);
+	} else {
+		finish_copy_notes_for_rewrite(the_repository, c, msg);
+	}
+	strbuf_release(&buf);
+	return ret;
+}
+
+static struct notes_tree *init_notes_check(const char *subcommand,
+					   int flags)
+{
+	struct notes_tree *t;
+	const char *ref;
+	init_notes(NULL, NULL, NULL, flags);
+	t = &default_notes_tree;
+
+	ref = (flags & NOTES_INIT_WRITABLE) ? t->update_ref : t->ref;
+	if (!starts_with(ref, "refs/notes/"))
+		/*
+		 * TRANSLATORS: the first %s will be replaced by a git
+		 * notes command: 'add', 'merge', 'remove', etc.
+		 */
+		die(_("refusing to %s notes in %s (outside of refs/notes/)"),
+		    subcommand, ref);
+	return t;
+}
+
+static int list(int argc, const char **argv, const char *prefix)
+{
+	struct notes_tree *t;
+	struct object_id object;
+	const struct object_id *note;
+	int retval = -1;
+	struct option options[] = {
+		OPT_END()
+	};
+
+	if (argc)
+		argc = parse_options(argc, argv, prefix, options,
+				     git_notes_list_usage, 0);
+
+	if (1 < argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_list_usage, options);
+	}
+
+	t = init_notes_check("list", 0);
+	if (argc) {
+		if (get_oid(argv[0], &object))
+			die(_("failed to resolve '%s' as a valid ref."), argv[0]);
+		note = get_note(t, &object);
+		if (note) {
+			puts(oid_to_hex(note));
+			retval = 0;
+		} else
+			retval = error(_("no note found for object %s."),
+				       oid_to_hex(&object));
+	} else
+		retval = for_each_note(t, 0, list_each_note, NULL);
+
+	free_notes(t);
+	return retval;
+}
+
+static int append_edit(int argc, const char **argv, const char *prefix);
+
+static int add(int argc, const char **argv, const char *prefix)
+{
+	int force = 0, allow_empty = 0;
+	const char *object_ref;
+	struct notes_tree *t;
+	struct object_id object, new_note;
+	const struct object_id *note;
+	struct note_data d = { 0, 0, NULL, STRBUF_INIT };
+	struct option options[] = {
+		{ OPTION_CALLBACK, 'm', "message", &d, N_("message"),
+			N_("note contents as a string"), PARSE_OPT_NONEG,
+			parse_msg_arg},
+		{ OPTION_CALLBACK, 'F', "file", &d, N_("file"),
+			N_("note contents in a file"), PARSE_OPT_NONEG,
+			parse_file_arg},
+		{ OPTION_CALLBACK, 'c', "reedit-message", &d, N_("object"),
+			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
+			parse_reedit_arg},
+		{ OPTION_CALLBACK, 'C', "reuse-message", &d, N_("object"),
+			N_("reuse specified note object"), PARSE_OPT_NONEG,
+			parse_reuse_arg},
+		OPT_BOOL(0, "allow-empty", &allow_empty,
+			N_("allow storing empty note")),
+		OPT__FORCE(&force, N_("replace existing notes"), PARSE_OPT_NOCOMPLETE),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (2 < argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_add_usage, options);
+	}
+
+	object_ref = argc > 1 ? argv[1] : "HEAD";
+
+	if (get_oid(object_ref, &object))
+		die(_("failed to resolve '%s' as a valid ref."), object_ref);
+
+	t = init_notes_check("add", NOTES_INIT_WRITABLE);
+	note = get_note(t, &object);
+
+	if (note) {
+		if (!force) {
+			free_notes(t);
+			if (d.given) {
+				free_note_data(&d);
+				return error(_("Cannot add notes. "
+					"Found existing notes for object %s. "
+					"Use '-f' to overwrite existing notes"),
+					oid_to_hex(&object));
+			}
+			/*
+			 * Redirect to "edit" subcommand.
+			 *
+			 * We only end up here if none of -m/-F/-c/-C or -f are
+			 * given. The original args are therefore still in
+			 * argv[0-1].
+			 */
+			argv[0] = "edit";
+			return append_edit(argc, argv, prefix);
+		}
+		fprintf(stderr, _("Overwriting existing notes for object %s\n"),
+			oid_to_hex(&object));
+	}
+
+	prepare_note_data(&object, &d, note);
+	if (d.buf.len || allow_empty) {
+		write_note_data(&d, &new_note);
+		if (add_note(t, &object, &new_note, combine_notes_overwrite))
+			BUG("combine_notes_overwrite failed");
+		commit_notes(the_repository, t,
+			     "Notes added by 'git notes add'");
+	} else {
+		fprintf(stderr, _("Removing note for object %s\n"),
+			oid_to_hex(&object));
+		remove_note(t, object.hash);
+		commit_notes(the_repository, t,
+			     "Notes removed by 'git notes add'");
+	}
+
+	free_note_data(&d);
+	free_notes(t);
+	return 0;
+}
+
+static int copy(int argc, const char **argv, const char *prefix)
+{
+	int retval = 0, force = 0, from_stdin = 0;
+	const struct object_id *from_note, *note;
+	const char *object_ref;
+	struct object_id object, from_obj;
+	struct notes_tree *t;
+	const char *rewrite_cmd = NULL;
+	struct option options[] = {
+		OPT__FORCE(&force, N_("replace existing notes"), PARSE_OPT_NOCOMPLETE),
+		OPT_BOOL(0, "stdin", &from_stdin, N_("read objects from stdin")),
+		OPT_STRING(0, "for-rewrite", &rewrite_cmd, N_("command"),
+			   N_("load rewriting config for <command> (implies "
+			      "--stdin)")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
+			     0);
+
+	if (from_stdin || rewrite_cmd) {
+		if (argc) {
+			error(_("too many parameters"));
+			usage_with_options(git_notes_copy_usage, options);
+		} else {
+			return notes_copy_from_stdin(force, rewrite_cmd);
+		}
+	}
+
+	if (argc < 2) {
+		error(_("too few parameters"));
+		usage_with_options(git_notes_copy_usage, options);
+	}
+	if (2 < argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_copy_usage, options);
+	}
+
+	if (get_oid(argv[0], &from_obj))
+		die(_("failed to resolve '%s' as a valid ref."), argv[0]);
+
+	object_ref = 1 < argc ? argv[1] : "HEAD";
+
+	if (get_oid(object_ref, &object))
+		die(_("failed to resolve '%s' as a valid ref."), object_ref);
+
+	t = init_notes_check("copy", NOTES_INIT_WRITABLE);
+	note = get_note(t, &object);
+
+	if (note) {
+		if (!force) {
+			retval = error(_("Cannot copy notes. Found existing "
+				       "notes for object %s. Use '-f' to "
+				       "overwrite existing notes"),
+				       oid_to_hex(&object));
+			goto out;
+		}
+		fprintf(stderr, _("Overwriting existing notes for object %s\n"),
+			oid_to_hex(&object));
+	}
+
+	from_note = get_note(t, &from_obj);
+	if (!from_note) {
+		retval = error(_("missing notes on source object %s. Cannot "
+			       "copy."), oid_to_hex(&from_obj));
+		goto out;
+	}
+
+	if (add_note(t, &object, from_note, combine_notes_overwrite))
+		BUG("combine_notes_overwrite failed");
+	commit_notes(the_repository, t,
+		     "Notes added by 'git notes copy'");
+out:
+	free_notes(t);
+	return retval;
+}
+
+static int append_edit(int argc, const char **argv, const char *prefix)
+{
+	int allow_empty = 0;
+	const char *object_ref;
+	struct notes_tree *t;
+	struct object_id object, new_note;
+	const struct object_id *note;
+	char *logmsg;
+	const char * const *usage;
+	struct note_data d = { 0, 0, NULL, STRBUF_INIT };
+	struct option options[] = {
+		{ OPTION_CALLBACK, 'm', "message", &d, N_("message"),
+			N_("note contents as a string"), PARSE_OPT_NONEG,
+			parse_msg_arg},
+		{ OPTION_CALLBACK, 'F', "file", &d, N_("file"),
+			N_("note contents in a file"), PARSE_OPT_NONEG,
+			parse_file_arg},
+		{ OPTION_CALLBACK, 'c', "reedit-message", &d, N_("object"),
+			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
+			parse_reedit_arg},
+		{ OPTION_CALLBACK, 'C', "reuse-message", &d, N_("object"),
+			N_("reuse specified note object"), PARSE_OPT_NONEG,
+			parse_reuse_arg},
+		OPT_BOOL(0, "allow-empty", &allow_empty,
+			N_("allow storing empty note")),
+		OPT_END()
+	};
+	int edit = !strcmp(argv[0], "edit");
+
+	usage = edit ? git_notes_edit_usage : git_notes_append_usage;
+	argc = parse_options(argc, argv, prefix, options, usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (2 < argc) {
+		error(_("too many parameters"));
+		usage_with_options(usage, options);
+	}
+
+	if (d.given && edit)
+		fprintf(stderr, _("The -m/-F/-c/-C options have been deprecated "
+			"for the 'edit' subcommand.\n"
+			"Please use 'git notes add -f -m/-F/-c/-C' instead.\n"));
+
+	object_ref = 1 < argc ? argv[1] : "HEAD";
+
+	if (get_oid(object_ref, &object))
+		die(_("failed to resolve '%s' as a valid ref."), object_ref);
+
+	t = init_notes_check(argv[0], NOTES_INIT_WRITABLE);
+	note = get_note(t, &object);
+
+	prepare_note_data(&object, &d, edit && note ? note : NULL);
+
+	if (note && !edit) {
+		/* Append buf to previous note contents */
+		unsigned long size;
+		enum object_type type;
+		char *prev_buf = read_object_file(note, &type, &size);
+
+		strbuf_grow(&d.buf, size + 1);
+		if (d.buf.len && prev_buf && size)
+			strbuf_insert(&d.buf, 0, "\n", 1);
+		if (prev_buf && size)
+			strbuf_insert(&d.buf, 0, prev_buf, size);
+		free(prev_buf);
+	}
+
+	if (d.buf.len || allow_empty) {
+		write_note_data(&d, &new_note);
+		if (add_note(t, &object, &new_note, combine_notes_overwrite))
+			BUG("combine_notes_overwrite failed");
+		logmsg = xstrfmt("Notes added by 'git notes %s'", argv[0]);
+	} else {
+		fprintf(stderr, _("Removing note for object %s\n"),
+			oid_to_hex(&object));
+		remove_note(t, object.hash);
+		logmsg = xstrfmt("Notes removed by 'git notes %s'", argv[0]);
+	}
+	commit_notes(the_repository, t, logmsg);
+
+	free(logmsg);
+	free_note_data(&d);
+	free_notes(t);
+	return 0;
+}
+
+static int show(int argc, const char **argv, const char *prefix)
+{
+	const char *object_ref;
+	struct notes_tree *t;
+	struct object_id object;
+	const struct object_id *note;
+	int retval;
+	struct option options[] = {
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
+			     0);
+
+	if (1 < argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_show_usage, options);
+	}
+
+	object_ref = argc ? argv[0] : "HEAD";
+
+	if (get_oid(object_ref, &object))
+		die(_("failed to resolve '%s' as a valid ref."), object_ref);
+
+	t = init_notes_check("show", 0);
+	note = get_note(t, &object);
+
+	if (!note)
+		retval = error(_("no note found for object %s."),
+			       oid_to_hex(&object));
+	else {
+		const char *show_args[3] = {"show", oid_to_hex(note), NULL};
+		retval = execv_git_cmd(show_args);
+	}
+	free_notes(t);
+	return retval;
+}
+
+static int merge_abort(struct notes_merge_options *o)
+{
+	int ret = 0;
+
+	/*
+	 * Remove .git/NOTES_MERGE_PARTIAL and .git/NOTES_MERGE_REF, and call
+	 * notes_merge_abort() to remove .git/NOTES_MERGE_WORKTREE.
+	 */
+
+	if (delete_ref(NULL, "NOTES_MERGE_PARTIAL", NULL, 0))
+		ret += error(_("failed to delete ref NOTES_MERGE_PARTIAL"));
+	if (delete_ref(NULL, "NOTES_MERGE_REF", NULL, REF_NO_DEREF))
+		ret += error(_("failed to delete ref NOTES_MERGE_REF"));
+	if (notes_merge_abort(o))
+		ret += error(_("failed to remove 'git notes merge' worktree"));
+	return ret;
+}
+
+static int merge_commit(struct notes_merge_options *o)
+{
+	struct strbuf msg = STRBUF_INIT;
+	struct object_id oid, parent_oid;
+	struct notes_tree *t;
+	struct commit *partial;
+	struct pretty_print_context pretty_ctx;
+	void *local_ref_to_free;
+	int ret;
+
+	/*
+	 * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
+	 * and target notes ref from .git/NOTES_MERGE_REF.
+	 */
+
+	if (get_oid("NOTES_MERGE_PARTIAL", &oid))
+		die(_("failed to read ref NOTES_MERGE_PARTIAL"));
+	else if (!(partial = lookup_commit_reference(the_repository, &oid)))
+		die(_("could not find commit from NOTES_MERGE_PARTIAL."));
+	else if (parse_commit(partial))
+		die(_("could not parse commit from NOTES_MERGE_PARTIAL."));
+
+	if (partial->parents)
+		oidcpy(&parent_oid, &partial->parents->item->object.oid);
+	else
+		oidclr(&parent_oid);
+
+	t = xcalloc(1, sizeof(struct notes_tree));
+	init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
+
+	o->local_ref = local_ref_to_free =
+		resolve_refdup("NOTES_MERGE_REF", 0, &oid, NULL);
+	if (!o->local_ref)
+		die(_("failed to resolve NOTES_MERGE_REF"));
+
+	if (notes_merge_commit(o, t, partial, &oid))
+		die(_("failed to finalize notes merge"));
+
+	/* Reuse existing commit message in reflog message */
+	memset(&pretty_ctx, 0, sizeof(pretty_ctx));
+	format_commit_message(partial, "%s", &msg, &pretty_ctx);
+	strbuf_trim(&msg);
+	strbuf_insert(&msg, 0, "notes: ", 7);
+	update_ref(msg.buf, o->local_ref, &oid,
+		   is_null_oid(&parent_oid) ? NULL : &parent_oid,
+		   0, UPDATE_REFS_DIE_ON_ERR);
+
+	free_notes(t);
+	strbuf_release(&msg);
+	ret = merge_abort(o);
+	free(local_ref_to_free);
+	return ret;
+}
+
+static int git_config_get_notes_strategy(const char *key,
+					 enum notes_merge_strategy *strategy)
+{
+	char *value;
+
+	if (git_config_get_string(key, &value))
+		return 1;
+	if (parse_notes_merge_strategy(value, strategy))
+		git_die_config(key, _("unknown notes merge strategy %s"), value);
+
+	free(value);
+	return 0;
+}
+
+static int merge(int argc, const char **argv, const char *prefix)
+{
+	struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
+	struct object_id result_oid;
+	struct notes_tree *t;
+	struct notes_merge_options o;
+	int do_merge = 0, do_commit = 0, do_abort = 0;
+	int verbosity = 0, result;
+	const char *strategy = NULL;
+	struct option options[] = {
+		OPT_GROUP(N_("General options")),
+		OPT__VERBOSITY(&verbosity),
+		OPT_GROUP(N_("Merge options")),
+		OPT_STRING('s', "strategy", &strategy, N_("strategy"),
+			   N_("resolve notes conflicts using the given strategy "
+			      "(manual/ours/theirs/union/cat_sort_uniq)")),
+		OPT_GROUP(N_("Committing unmerged notes")),
+		OPT_SET_INT_F(0, "commit", &do_commit,
+			      N_("finalize notes merge by committing unmerged notes"),
+			      1, PARSE_OPT_NONEG),
+		OPT_GROUP(N_("Aborting notes merge resolution")),
+		OPT_SET_INT_F(0, "abort", &do_abort,
+			      N_("abort notes merge"),
+			      1, PARSE_OPT_NONEG),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_notes_merge_usage, 0);
+
+	if (strategy || do_commit + do_abort == 0)
+		do_merge = 1;
+	if (do_merge + do_commit + do_abort != 1) {
+		error(_("cannot mix --commit, --abort or -s/--strategy"));
+		usage_with_options(git_notes_merge_usage, options);
+	}
+
+	if (do_merge && argc != 1) {
+		error(_("must specify a notes ref to merge"));
+		usage_with_options(git_notes_merge_usage, options);
+	} else if (!do_merge && argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_merge_usage, options);
+	}
+
+	init_notes_merge_options(the_repository, &o);
+	o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
+
+	if (do_abort)
+		return merge_abort(&o);
+	if (do_commit)
+		return merge_commit(&o);
+
+	o.local_ref = default_notes_ref();
+	strbuf_addstr(&remote_ref, argv[0]);
+	expand_loose_notes_ref(&remote_ref);
+	o.remote_ref = remote_ref.buf;
+
+	t = init_notes_check("merge", NOTES_INIT_WRITABLE);
+
+	if (strategy) {
+		if (parse_notes_merge_strategy(strategy, &o.strategy)) {
+			error(_("unknown -s/--strategy: %s"), strategy);
+			usage_with_options(git_notes_merge_usage, options);
+		}
+	} else {
+		struct strbuf merge_key = STRBUF_INIT;
+		const char *short_ref = NULL;
+
+		if (!skip_prefix(o.local_ref, "refs/notes/", &short_ref))
+			BUG("local ref %s is outside of refs/notes/",
+			    o.local_ref);
+
+		strbuf_addf(&merge_key, "notes.%s.mergeStrategy", short_ref);
+
+		if (git_config_get_notes_strategy(merge_key.buf, &o.strategy))
+			git_config_get_notes_strategy("notes.mergeStrategy", &o.strategy);
+
+		strbuf_release(&merge_key);
+	}
+
+	strbuf_addf(&msg, "notes: Merged notes from %s into %s",
+		    remote_ref.buf, default_notes_ref());
+	strbuf_add(&(o.commit_msg), msg.buf + 7, msg.len - 7); /* skip "notes: " */
+
+	result = notes_merge(&o, t, &result_oid);
+
+	if (result >= 0) /* Merge resulted (trivially) in result_oid */
+		/* Update default notes ref with new commit */
+		update_ref(msg.buf, default_notes_ref(), &result_oid, NULL, 0,
+			   UPDATE_REFS_DIE_ON_ERR);
+	else { /* Merge has unresolved conflicts */
+		const struct worktree *wt;
+		/* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
+		update_ref(msg.buf, "NOTES_MERGE_PARTIAL", &result_oid, NULL,
+			   0, UPDATE_REFS_DIE_ON_ERR);
+		/* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
+		wt = find_shared_symref("NOTES_MERGE_REF", default_notes_ref());
+		if (wt)
+			die(_("a notes merge into %s is already in-progress at %s"),
+			    default_notes_ref(), wt->path);
+		if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
+			die(_("failed to store link to current notes ref (%s)"),
+			    default_notes_ref());
+		fprintf(stderr, _("Automatic notes merge failed. Fix conflicts in %s "
+				  "and commit the result with 'git notes merge --commit', "
+				  "or abort the merge with 'git notes merge --abort'.\n"),
+			git_path(NOTES_MERGE_WORKTREE));
+	}
+
+	free_notes(t);
+	strbuf_release(&remote_ref);
+	strbuf_release(&msg);
+	return result < 0; /* return non-zero on conflicts */
+}
+
+#define IGNORE_MISSING 1
+
+static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag)
+{
+	int status;
+	struct object_id oid;
+	if (get_oid(name, &oid))
+		return error(_("Failed to resolve '%s' as a valid ref."), name);
+	status = remove_note(t, oid.hash);
+	if (status)
+		fprintf(stderr, _("Object %s has no note\n"), name);
+	else
+		fprintf(stderr, _("Removing note for object %s\n"), name);
+	return (flag & IGNORE_MISSING) ? 0 : status;
+}
+
+static int remove_cmd(int argc, const char **argv, const char *prefix)
+{
+	unsigned flag = 0;
+	int from_stdin = 0;
+	struct option options[] = {
+		OPT_BIT(0, "ignore-missing", &flag,
+			N_("attempt to remove non-existent note is not an error"),
+			IGNORE_MISSING),
+		OPT_BOOL(0, "stdin", &from_stdin,
+			    N_("read object names from the standard input")),
+		OPT_END()
+	};
+	struct notes_tree *t;
+	int retval = 0;
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_notes_remove_usage, 0);
+
+	t = init_notes_check("remove", NOTES_INIT_WRITABLE);
+
+	if (!argc && !from_stdin) {
+		retval = remove_one_note(t, "HEAD", flag);
+	} else {
+		while (*argv) {
+			retval |= remove_one_note(t, *argv, flag);
+			argv++;
+		}
+	}
+	if (from_stdin) {
+		struct strbuf sb = STRBUF_INIT;
+		while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
+			strbuf_rtrim(&sb);
+			retval |= remove_one_note(t, sb.buf, flag);
+		}
+		strbuf_release(&sb);
+	}
+	if (!retval)
+		commit_notes(the_repository, t,
+			     "Notes removed by 'git notes remove'");
+	free_notes(t);
+	return retval;
+}
+
+static int prune(int argc, const char **argv, const char *prefix)
+{
+	struct notes_tree *t;
+	int show_only = 0, verbose = 0;
+	struct option options[] = {
+		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+		OPT__VERBOSE(&verbose, N_("report pruned notes")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
+			     0);
+
+	if (argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_prune_usage, options);
+	}
+
+	t = init_notes_check("prune", NOTES_INIT_WRITABLE);
+
+	prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
+		(show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
+	if (!show_only)
+		commit_notes(the_repository, t,
+			     "Notes removed by 'git notes prune'");
+	free_notes(t);
+	return 0;
+}
+
+static int get_ref(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = { OPT_END() };
+	argc = parse_options(argc, argv, prefix, options,
+			     git_notes_get_ref_usage, 0);
+
+	if (argc) {
+		error(_("too many parameters"));
+		usage_with_options(git_notes_get_ref_usage, options);
+	}
+
+	puts(default_notes_ref());
+	return 0;
+}
+
+int cmd_notes(int argc, const char **argv, const char *prefix)
+{
+	int result;
+	const char *override_notes_ref = NULL;
+	struct option options[] = {
+		OPT_STRING(0, "ref", &override_notes_ref, N_("notes-ref"),
+			   N_("use notes from <notes-ref>")),
+		OPT_END()
+	};
+
+	git_config(git_default_config, NULL);
+	argc = parse_options(argc, argv, prefix, options, git_notes_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (override_notes_ref) {
+		struct strbuf sb = STRBUF_INIT;
+		strbuf_addstr(&sb, override_notes_ref);
+		expand_notes_ref(&sb);
+		setenv("GIT_NOTES_REF", sb.buf, 1);
+		strbuf_release(&sb);
+	}
+
+	if (argc < 1 || !strcmp(argv[0], "list"))
+		result = list(argc, argv, prefix);
+	else if (!strcmp(argv[0], "add"))
+		result = add(argc, argv, prefix);
+	else if (!strcmp(argv[0], "copy"))
+		result = copy(argc, argv, prefix);
+	else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
+		result = append_edit(argc, argv, prefix);
+	else if (!strcmp(argv[0], "show"))
+		result = show(argc, argv, prefix);
+	else if (!strcmp(argv[0], "merge"))
+		result = merge(argc, argv, prefix);
+	else if (!strcmp(argv[0], "remove"))
+		result = remove_cmd(argc, argv, prefix);
+	else if (!strcmp(argv[0], "prune"))
+		result = prune(argc, argv, prefix);
+	else if (!strcmp(argv[0], "get-ref"))
+		result = get_ref(argc, argv, prefix);
+	else {
+		result = error(_("unknown subcommand: %s"), argv[0]);
+		usage_with_options(git_notes_usage, options);
+	}
+
+	return result ? 1 : 0;
+}