builtin/notes.c

   1 /*
   2  * Builtin "git notes"
   3  *
   4  * Copyright (c) 2010 Johan Herland <johan@herland.net>
   5  *
   6  * Based on git-notes.sh by Johannes Schindelin,
   7  * and builtin/tag.c by Kristian Høgsberg and Carlos Rica.
   8  */
   9
  10 #include "cache.h"
  11 #include "builtin.h"
  12 #include "notes.h"
  13 #include "blob.h"
  14 #include "commit.h"
  15 #include "refs.h"
  16 #include "exec_cmd.h"
  17 #include "run-command.h"
  18 #include "parse-options.h"
  19 #include "string-list.h"
  20 #include "notes-merge.h"
  21 #include "notes-utils.h"
  22
  23 static const char * const git_notes_usage[] = {
  24         N_("git notes [--ref <notes_ref>] [list [<object>]]"),
  25         N_("git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
  26         N_("git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>"),
  27         N_("git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
  28         N_("git notes [--ref <notes_ref>] edit [<object>]"),
  29         N_("git notes [--ref <notes_ref>] show [<object>]"),
  30         N_("git notes [--ref <notes_ref>] merge [-v | -q] [-s <strategy> ] <notes_ref>"),
  31         N_("git notes merge --commit [-v | -q]"),
  32         N_("git notes merge --abort [-v | -q]"),
  33         N_("git notes [--ref <notes_ref>] remove [<object>...]"),
  34         N_("git notes [--ref <notes_ref>] prune [-n | -v]"),
  35         N_("git notes [--ref <notes_ref>] get-ref"),
  36         NULL
  37 };
  38
  39 static const char * const git_notes_list_usage[] = {
  40         N_("git notes [list [<object>]]"),
  41         NULL
  42 };
  43
  44 static const char * const git_notes_add_usage[] = {
  45         N_("git notes add [<options>] [<object>]"),
  46         NULL
  47 };
  48
  49 static const char * const git_notes_copy_usage[] = {
  50         N_("git notes copy [<options>] <from-object> <to-object>"),
  51         N_("git notes copy --stdin [<from-object> <to-object>]..."),
  52         NULL
  53 };
  54
  55 static const char * const git_notes_append_usage[] = {
  56         N_("git notes append [<options>] [<object>]"),
  57         NULL
  58 };
  59
  60 static const char * const git_notes_edit_usage[] = {
  61         N_("git notes edit [<object>]"),
  62         NULL
  63 };
  64
  65 static const char * const git_notes_show_usage[] = {
  66         N_("git notes show [<object>]"),
  67         NULL
  68 };
  69
  70 static const char * const git_notes_merge_usage[] = {
  71         N_("git notes merge [<options>] <notes_ref>"),
  72         N_("git notes merge --commit [<options>]"),
  73         N_("git notes merge --abort [<options>]"),
  74         NULL
  75 };
  76
  77 static const char * const git_notes_remove_usage[] = {
  78         N_("git notes remove [<object>]"),
  79         NULL
  80 };
  81
  82 static const char * const git_notes_prune_usage[] = {
  83         N_("git notes prune [<options>]"),
  84         NULL
  85 };
  86
  87 static const char * const git_notes_get_ref_usage[] = {
  88         N_("git notes get-ref"),
  89         NULL
  90 };
  91
  92 static const char note_template[] =
  93         "\nWrite/edit the notes for the following object:\n";
  94
  95 struct msg_arg {
  96         int given;
  97         int use_editor;
  98         struct strbuf buf;
  99 };
 100
 101 static int list_each_note(const unsigned char *object_sha1,
 102                 const unsigned char *note_sha1, char *note_path,
 103                 void *cb_data)
 104 {
 105         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
 106         return 0;
 107 }
 108
 109 static void write_note_data(int fd, const unsigned char *sha1)
 110 {
 111         unsigned long size;
 112         enum object_type type;
 113         char *buf = read_sha1_file(sha1, &type, &size);
 114         if (buf) {
 115                 if (size)
 116                         write_or_die(fd, buf, size);
 117                 free(buf);
 118         }
 119 }
 120
 121 static void write_commented_object(int fd, const unsigned char *object)
 122 {
 123         const char *show_args[5] =
 124                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
 125         struct child_process show;
 126         struct strbuf buf = STRBUF_INIT;
 127         struct strbuf cbuf = STRBUF_INIT;
 128
 129         /* Invoke "git show --stat --no-notes $object" */
 130         memset(&show, 0, sizeof(show));
 131         show.argv = show_args;
 132         show.no_stdin = 1;
 133         show.out = -1;
 134         show.err = 0;
 135         show.git_cmd = 1;
 136         if (start_command(&show))
 137                 die(_("unable to start 'show' for object '%s'"),
 138                     sha1_to_hex(object));
 139
 140         if (strbuf_read(&buf, show.out, 0) < 0)
 141                 die_errno(_("could not read 'show' output"));
 142         strbuf_add_commented_lines(&cbuf, buf.buf, buf.len);
 143         write_or_die(fd, cbuf.buf, cbuf.len);
 144
 145         strbuf_release(&cbuf);
 146         strbuf_release(&buf);
 147
 148         if (finish_command(&show))
 149                 die(_("failed to finish 'show' for object '%s'"),
 150                     sha1_to_hex(object));
 151 }
 152
 153 static void create_note(const unsigned char *object, struct msg_arg *msg,
 154                         int append_only, const unsigned char *prev,
 155                         unsigned char *result)
 156 {
 157         char *path = NULL;
 158
 159         if (msg->use_editor || !msg->given) {
 160                 int fd;
 161                 struct strbuf buf = STRBUF_INIT;
 162
 163                 /* write the template message before editing: */
 164                 path = git_pathdup("NOTES_EDITMSG");
 165                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 166                 if (fd < 0)
 167                         die_errno(_("could not create file '%s'"), path);
 168
 169                 if (msg->given)
 170                         write_or_die(fd, msg->buf.buf, msg->buf.len);
 171                 else if (prev && !append_only)
 172                         write_note_data(fd, prev);
 173
 174                 strbuf_addch(&buf, '\n');
 175                 strbuf_add_commented_lines(&buf, note_template, strlen(note_template));
 176                 strbuf_addch(&buf, '\n');
 177                 write_or_die(fd, buf.buf, buf.len);
 178
 179                 write_commented_object(fd, object);
 180
 181                 close(fd);
 182                 strbuf_release(&buf);
 183                 strbuf_reset(&(msg->buf));
 184
 185                 if (launch_editor(path, &(msg->buf), NULL)) {
 186                         die(_("Please supply the note contents using either -m" \
 187                             " or -F option"));
 188                 }
 189                 stripspace(&(msg->buf), 1);
 190         }
 191
 192         if (prev && append_only) {
 193                 /* Append buf to previous note contents */
 194                 unsigned long size;
 195                 enum object_type type;
 196                 char *prev_buf = read_sha1_file(prev, &type, &size);
 197
 198                 strbuf_grow(&(msg->buf), size + 1);
 199                 if (msg->buf.len && prev_buf && size)
 200                         strbuf_insert(&(msg->buf), 0, "\n", 1);
 201                 if (prev_buf && size)
 202                         strbuf_insert(&(msg->buf), 0, prev_buf, size);
 203                 free(prev_buf);
 204         }
 205
 206         if (!msg->buf.len) {
 207                 fprintf(stderr, _("Removing note for object %s\n"),
 208                         sha1_to_hex(object));
 209                 hashclr(result);
 210         } else {
 211                 if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
 212                         error(_("unable to write note object"));
 213                         if (path)
 214                                 error(_("The note contents has been left in %s"),
 215                                       path);
 216                         exit(128);
 217                 }
 218         }
 219
 220         if (path) {
 221                 unlink_or_warn(path);
 222                 free(path);
 223         }
 224 }
 225
 226 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 227 {
 228         struct msg_arg *msg = opt->value;
 229
 230         strbuf_grow(&(msg->buf), strlen(arg) + 2);
 231         if (msg->buf.len)
 232                 strbuf_addch(&(msg->buf), '\n');
 233         strbuf_addstr(&(msg->buf), arg);
 234         stripspace(&(msg->buf), 0);
 235
 236         msg->given = 1;
 237         return 0;
 238 }
 239
 240 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 241 {
 242         struct msg_arg *msg = opt->value;
 243
 244         if (msg->buf.len)
 245                 strbuf_addch(&(msg->buf), '\n');
 246         if (!strcmp(arg, "-")) {
 247                 if (strbuf_read(&(msg->buf), 0, 1024) < 0)
 248                         die_errno(_("cannot read '%s'"), arg);
 249         } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
 250                 die_errno(_("could not open or read '%s'"), arg);
 251         stripspace(&(msg->buf), 0);
 252
 253         msg->given = 1;
 254         return 0;
 255 }
 256
 257 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 258 {
 259         struct msg_arg *msg = opt->value;
 260         char *buf;
 261         unsigned char object[20];
 262         enum object_type type;
 263         unsigned long len;
 264
 265         if (msg->buf.len)
 266                 strbuf_addch(&(msg->buf), '\n');
 267
 268         if (get_sha1(arg, object))
 269                 die(_("Failed to resolve '%s' as a valid ref."), arg);
 270         if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
 271                 free(buf);
 272                 die(_("Failed to read object '%s'."), arg);;
 273         }
 274         strbuf_add(&(msg->buf), buf, len);
 275         free(buf);
 276
 277         msg->given = 1;
 278         return 0;
 279 }
 280
 281 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 282 {
 283         struct msg_arg *msg = opt->value;
 284         msg->use_editor = 1;
 285         return parse_reuse_arg(opt, arg, unset);
 286 }
 287
 288 static int notes_copy_from_stdin(int force, const char *rewrite_cmd)
 289 {
 290         struct strbuf buf = STRBUF_INIT;
 291         struct notes_rewrite_cfg *c = NULL;
 292         struct notes_tree *t = NULL;
 293         int ret = 0;
 294         const char *msg = "Notes added by 'git notes copy'";
 295
 296         if (rewrite_cmd) {
 297                 c = init_copy_notes_for_rewrite(rewrite_cmd);
 298                 if (!c)
 299                         return 0;
 300         } else {
 301                 init_notes(NULL, NULL, NULL, 0);
 302                 t = &default_notes_tree;
 303         }
 304
 305         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 306                 unsigned char from_obj[20], to_obj[20];
 307                 struct strbuf **split;
 308                 int err;
 309
 310                 split = strbuf_split(&buf, ' ');
 311                 if (!split[0] || !split[1])
 312                         die(_("Malformed input line: '%s'."), buf.buf);
 313                 strbuf_rtrim(split[0]);
 314                 strbuf_rtrim(split[1]);
 315                 if (get_sha1(split[0]->buf, from_obj))
 316                         die(_("Failed to resolve '%s' as a valid ref."), split[0]->buf);
 317                 if (get_sha1(split[1]->buf, to_obj))
 318                         die(_("Failed to resolve '%s' as a valid ref."), split[1]->buf);
 319
 320                 if (rewrite_cmd)
 321                         err = copy_note_for_rewrite(c, from_obj, to_obj);
 322                 else
 323                         err = copy_note(t, from_obj, to_obj, force,
 324                                         combine_notes_overwrite);
 325
 326                 if (err) {
 327                         error(_("Failed to copy notes from '%s' to '%s'"),
 328                               split[0]->buf, split[1]->buf);
 329                         ret = 1;
 330                 }
 331
 332                 strbuf_list_free(split);
 333         }
 334
 335         if (!rewrite_cmd) {
 336                 commit_notes(t, msg);
 337                 free_notes(t);
 338         } else {
 339                 finish_copy_notes_for_rewrite(c, msg);
 340         }
 341         return ret;
 342 }
 343
 344 static struct notes_tree *init_notes_check(const char *subcommand)
 345 {
 346         struct notes_tree *t;
 347         init_notes(NULL, NULL, NULL, 0);
 348         t = &default_notes_tree;
 349
 350         if (!starts_with(t->ref, "refs/notes/"))
 351                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 352                     subcommand, t->ref);
 353         return t;
 354 }
 355
 356 static int list(int argc, const char **argv, const char *prefix)
 357 {
 358         struct notes_tree *t;
 359         unsigned char object[20];
 360         const unsigned char *note;
 361         int retval = -1;
 362         struct option options[] = {
 363                 OPT_END()
 364         };
 365
 366         if (argc)
 367                 argc = parse_options(argc, argv, prefix, options,
 368                                      git_notes_list_usage, 0);
 369
 370         if (1 < argc) {
 371                 error(_("too many parameters"));
 372                 usage_with_options(git_notes_list_usage, options);
 373         }
 374
 375         t = init_notes_check("list");
 376         if (argc) {
 377                 if (get_sha1(argv[0], object))
 378                         die(_("Failed to resolve '%s' as a valid ref."), argv[0]);
 379                 note = get_note(t, object);
 380                 if (note) {
 381                         puts(sha1_to_hex(note));
 382                         retval = 0;
 383                 } else
 384                         retval = error(_("No note found for object %s."),
 385                                        sha1_to_hex(object));
 386         } else
 387                 retval = for_each_note(t, 0, list_each_note, NULL);
 388
 389         free_notes(t);
 390         return retval;
 391 }
 392
 393 static int append_edit(int argc, const char **argv, const char *prefix);
 394
 395 static int add(int argc, const char **argv, const char *prefix)
 396 {
 397         int retval = 0, force = 0;
 398         const char *object_ref;
 399         struct notes_tree *t;
 400         unsigned char object[20], new_note[20];
 401         char logmsg[100];
 402         const unsigned char *note;
 403         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 404         struct option options[] = {
 405                 { OPTION_CALLBACK, 'm', "message", &msg, N_("message"),
 406                         N_("note contents as a string"), PARSE_OPT_NONEG,
 407                         parse_msg_arg},
 408                 { OPTION_CALLBACK, 'F', "file", &msg, N_("file"),
 409                         N_("note contents in a file"), PARSE_OPT_NONEG,
 410                         parse_file_arg},
 411                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, N_("object"),
 412                         N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 413                         parse_reedit_arg},
 414                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, N_("object"),
 415                         N_("reuse specified note object"), PARSE_OPT_NONEG,
 416                         parse_reuse_arg},
 417                 OPT__FORCE(&force, N_("replace existing notes")),
 418                 OPT_END()
 419         };
 420
 421         argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
 422                              PARSE_OPT_KEEP_ARGV0);
 423
 424         if (2 < argc) {
 425                 error(_("too many parameters"));
 426                 usage_with_options(git_notes_add_usage, options);
 427         }
 428
 429         object_ref = argc > 1 ? argv[1] : "HEAD";
 430
 431         if (get_sha1(object_ref, object))
 432                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 433
 434         t = init_notes_check("add");
 435         note = get_note(t, object);
 436
 437         if (note) {
 438                 if (!force) {
 439                         if (!msg.given) {
 440                                 /*
 441                                  * Redirect to "edit" subcommand.
 442                                  *
 443                                  * We only end up here if none of -m/-F/-c/-C
 444                                  * or -f are given. The original args are
 445                                  * therefore still in argv[0-1].
 446                                  */
 447                                 argv[0] = "edit";
 448                                 free_notes(t);
 449                                 return append_edit(argc, argv, prefix);
 450                         }
 451                         retval = error(_("Cannot add notes. Found existing notes "
 452                                        "for object %s. Use '-f' to overwrite "
 453                                        "existing notes"), sha1_to_hex(object));
 454                         goto out;
 455                 }
 456                 fprintf(stderr, _("Overwriting existing notes for object %s\n"),
 457                         sha1_to_hex(object));
 458         }
 459
 460         create_note(object, &msg, 0, note, new_note);
 461
 462         if (is_null_sha1(new_note))
 463                 remove_note(t, object);
 464         else if (add_note(t, object, new_note, combine_notes_overwrite))
 465                 die("BUG: combine_notes_overwrite failed");
 466
 467         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 468                  is_null_sha1(new_note) ? "removed" : "added", "add");
 469         commit_notes(t, logmsg);
 470 out:
 471         free_notes(t);
 472         strbuf_release(&(msg.buf));
 473         return retval;
 474 }
 475
 476 static int copy(int argc, const char **argv, const char *prefix)
 477 {
 478         int retval = 0, force = 0, from_stdin = 0;
 479         const unsigned char *from_note, *note;
 480         const char *object_ref;
 481         unsigned char object[20], from_obj[20];
 482         struct notes_tree *t;
 483         const char *rewrite_cmd = NULL;
 484         struct option options[] = {
 485                 OPT__FORCE(&force, N_("replace existing notes")),
 486                 OPT_BOOL(0, "stdin", &from_stdin, N_("read objects from stdin")),
 487                 OPT_STRING(0, "for-rewrite", &rewrite_cmd, N_("command"),
 488                            N_("load rewriting config for <command> (implies "
 489                               "--stdin)")),
 490                 OPT_END()
 491         };
 492
 493         argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
 494                              0);
 495
 496         if (from_stdin || rewrite_cmd) {
 497                 if (argc) {
 498                         error(_("too many parameters"));
 499                         usage_with_options(git_notes_copy_usage, options);
 500                 } else {
 501                         return notes_copy_from_stdin(force, rewrite_cmd);
 502                 }
 503         }
 504
 505         if (argc < 2) {
 506                 error(_("too few parameters"));
 507                 usage_with_options(git_notes_copy_usage, options);
 508         }
 509         if (2 < argc) {
 510                 error(_("too many parameters"));
 511                 usage_with_options(git_notes_copy_usage, options);
 512         }
 513
 514         if (get_sha1(argv[0], from_obj))
 515                 die(_("Failed to resolve '%s' as a valid ref."), argv[0]);
 516
 517         object_ref = 1 < argc ? argv[1] : "HEAD";
 518
 519         if (get_sha1(object_ref, object))
 520                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 521
 522         t = init_notes_check("copy");
 523         note = get_note(t, object);
 524
 525         if (note) {
 526                 if (!force) {
 527                         retval = error(_("Cannot copy notes. Found existing "
 528                                        "notes for object %s. Use '-f' to "
 529                                        "overwrite existing notes"),
 530                                        sha1_to_hex(object));
 531                         goto out;
 532                 }
 533                 fprintf(stderr, _("Overwriting existing notes for object %s\n"),
 534                         sha1_to_hex(object));
 535         }
 536
 537         from_note = get_note(t, from_obj);
 538         if (!from_note) {
 539                 retval = error(_("Missing notes on source object %s. Cannot "
 540                                "copy."), sha1_to_hex(from_obj));
 541                 goto out;
 542         }
 543
 544         if (add_note(t, object, from_note, combine_notes_overwrite))
 545                 die("BUG: combine_notes_overwrite failed");
 546         commit_notes(t, "Notes added by 'git notes copy'");
 547 out:
 548         free_notes(t);
 549         return retval;
 550 }
 551
 552 static int append_edit(int argc, const char **argv, const char *prefix)
 553 {
 554         const char *object_ref;
 555         struct notes_tree *t;
 556         unsigned char object[20], new_note[20];
 557         const unsigned char *note;
 558         char logmsg[100];
 559         const char * const *usage;
 560         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 561         struct option options[] = {
 562                 { OPTION_CALLBACK, 'm', "message", &msg, N_("message"),
 563                         N_("note contents as a string"), PARSE_OPT_NONEG,
 564                         parse_msg_arg},
 565                 { OPTION_CALLBACK, 'F', "file", &msg, N_("file"),
 566                         N_("note contents in a file"), PARSE_OPT_NONEG,
 567                         parse_file_arg},
 568                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, N_("object"),
 569                         N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 570                         parse_reedit_arg},
 571                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, N_("object"),
 572                         N_("reuse specified note object"), PARSE_OPT_NONEG,
 573                         parse_reuse_arg},
 574                 OPT_END()
 575         };
 576         int edit = !strcmp(argv[0], "edit");
 577
 578         usage = edit ? git_notes_edit_usage : git_notes_append_usage;
 579         argc = parse_options(argc, argv, prefix, options, usage,
 580                              PARSE_OPT_KEEP_ARGV0);
 581
 582         if (2 < argc) {
 583                 error(_("too many parameters"));
 584                 usage_with_options(usage, options);
 585         }
 586
 587         if (msg.given && edit)
 588                 fprintf(stderr, _("The -m/-F/-c/-C options have been deprecated "
 589                         "for the 'edit' subcommand.\n"
 590                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n"));
 591
 592         object_ref = 1 < argc ? argv[1] : "HEAD";
 593
 594         if (get_sha1(object_ref, object))
 595                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 596
 597         t = init_notes_check(argv[0]);
 598         note = get_note(t, object);
 599
 600         create_note(object, &msg, !edit, note, new_note);
 601
 602         if (is_null_sha1(new_note))
 603                 remove_note(t, object);
 604         else if (add_note(t, object, new_note, combine_notes_overwrite))
 605                 die("BUG: combine_notes_overwrite failed");
 606
 607         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 608                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 609         commit_notes(t, logmsg);
 610         free_notes(t);
 611         strbuf_release(&(msg.buf));
 612         return 0;
 613 }
 614
 615 static int show(int argc, const char **argv, const char *prefix)
 616 {
 617         const char *object_ref;
 618         struct notes_tree *t;
 619         unsigned char object[20];
 620         const unsigned char *note;
 621         int retval;
 622         struct option options[] = {
 623                 OPT_END()
 624         };
 625
 626         argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
 627                              0);
 628
 629         if (1 < argc) {
 630                 error(_("too many parameters"));
 631                 usage_with_options(git_notes_show_usage, options);
 632         }
 633
 634         object_ref = argc ? argv[0] : "HEAD";
 635
 636         if (get_sha1(object_ref, object))
 637                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 638
 639         t = init_notes_check("show");
 640         note = get_note(t, object);
 641
 642         if (!note)
 643                 retval = error(_("No note found for object %s."),
 644                                sha1_to_hex(object));
 645         else {
 646                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 647                 retval = execv_git_cmd(show_args);
 648         }
 649         free_notes(t);
 650         return retval;
 651 }
 652
 653 static int merge_abort(struct notes_merge_options *o)
 654 {
 655         int ret = 0;
 656
 657         /*
 658          * Remove .git/NOTES_MERGE_PARTIAL and .git/NOTES_MERGE_REF, and call
 659          * notes_merge_abort() to remove .git/NOTES_MERGE_WORKTREE.
 660          */
 661
 662         if (delete_ref("NOTES_MERGE_PARTIAL", NULL, 0))
 663                 ret += error("Failed to delete ref NOTES_MERGE_PARTIAL");
 664         if (delete_ref("NOTES_MERGE_REF", NULL, REF_NODEREF))
 665                 ret += error("Failed to delete ref NOTES_MERGE_REF");
 666         if (notes_merge_abort(o))
 667                 ret += error("Failed to remove 'git notes merge' worktree");
 668         return ret;
 669 }
 670
 671 static int merge_commit(struct notes_merge_options *o)
 672 {
 673         struct strbuf msg = STRBUF_INIT;
 674         unsigned char sha1[20], parent_sha1[20];
 675         struct notes_tree *t;
 676         struct commit *partial;
 677         struct pretty_print_context pretty_ctx;
 678         void *local_ref_to_free;
 679         int ret;
 680
 681         /*
 682          * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
 683          * and target notes ref from .git/NOTES_MERGE_REF.
 684          */
 685
 686         if (get_sha1("NOTES_MERGE_PARTIAL", sha1))
 687                 die("Failed to read ref NOTES_MERGE_PARTIAL");
 688         else if (!(partial = lookup_commit_reference(sha1)))
 689                 die("Could not find commit from NOTES_MERGE_PARTIAL.");
 690         else if (parse_commit(partial))
 691                 die("Could not parse commit from NOTES_MERGE_PARTIAL.");
 692
 693         if (partial->parents)
 694                 hashcpy(parent_sha1, partial->parents->item->object.sha1);
 695         else
 696                 hashclr(parent_sha1);
 697
 698         t = xcalloc(1, sizeof(struct notes_tree));
 699         init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
 700
 701         o->local_ref = local_ref_to_free =
 702                 resolve_refdup("NOTES_MERGE_REF", sha1, 0, NULL);
 703         if (!o->local_ref)
 704                 die("Failed to resolve NOTES_MERGE_REF");
 705
 706         if (notes_merge_commit(o, t, partial, sha1))
 707                 die("Failed to finalize notes merge");
 708
 709         /* Reuse existing commit message in reflog message */
 710         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
 711         format_commit_message(partial, "%s", &msg, &pretty_ctx);
 712         strbuf_trim(&msg);
 713         strbuf_insert(&msg, 0, "notes: ", 7);
 714         update_ref(msg.buf, o->local_ref, sha1,
 715                    is_null_sha1(parent_sha1) ? NULL : parent_sha1,
 716                    0, DIE_ON_ERR);
 717
 718         free_notes(t);
 719         strbuf_release(&msg);
 720         ret = merge_abort(o);
 721         free(local_ref_to_free);
 722         return ret;
 723 }
 724
 725 static int merge(int argc, const char **argv, const char *prefix)
 726 {
 727         struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
 728         unsigned char result_sha1[20];
 729         struct notes_tree *t;
 730         struct notes_merge_options o;
 731         int do_merge = 0, do_commit = 0, do_abort = 0;
 732         int verbosity = 0, result;
 733         const char *strategy = NULL;
 734         struct option options[] = {
 735                 OPT_GROUP(N_("General options")),
 736                 OPT__VERBOSITY(&verbosity),
 737                 OPT_GROUP(N_("Merge options")),
 738                 OPT_STRING('s', "strategy", &strategy, N_("strategy"),
 739                            N_("resolve notes conflicts using the given strategy "
 740                               "(manual/ours/theirs/union/cat_sort_uniq)")),
 741                 OPT_GROUP(N_("Committing unmerged notes")),
 742                 { OPTION_SET_INT, 0, "commit", &do_commit, NULL,
 743                         N_("finalize notes merge by committing unmerged notes"),
 744                         PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
 745                 OPT_GROUP(N_("Aborting notes merge resolution")),
 746                 { OPTION_SET_INT, 0, "abort", &do_abort, NULL,
 747                         N_("abort notes merge"),
 748                         PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
 749                 OPT_END()
 750         };
 751
 752         argc = parse_options(argc, argv, prefix, options,
 753                              git_notes_merge_usage, 0);
 754
 755         if (strategy || do_commit + do_abort == 0)
 756                 do_merge = 1;
 757         if (do_merge + do_commit + do_abort != 1) {
 758                 error("cannot mix --commit, --abort or -s/--strategy");
 759                 usage_with_options(git_notes_merge_usage, options);
 760         }
 761
 762         if (do_merge && argc != 1) {
 763                 error("Must specify a notes ref to merge");
 764                 usage_with_options(git_notes_merge_usage, options);
 765         } else if (!do_merge && argc) {
 766                 error("too many parameters");
 767                 usage_with_options(git_notes_merge_usage, options);
 768         }
 769
 770         init_notes_merge_options(&o);
 771         o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
 772
 773         if (do_abort)
 774                 return merge_abort(&o);
 775         if (do_commit)
 776                 return merge_commit(&o);
 777
 778         o.local_ref = default_notes_ref();
 779         strbuf_addstr(&remote_ref, argv[0]);
 780         expand_notes_ref(&remote_ref);
 781         o.remote_ref = remote_ref.buf;
 782
 783         if (strategy) {
 784                 if (!strcmp(strategy, "manual"))
 785                         o.strategy = NOTES_MERGE_RESOLVE_MANUAL;
 786                 else if (!strcmp(strategy, "ours"))
 787                         o.strategy = NOTES_MERGE_RESOLVE_OURS;
 788                 else if (!strcmp(strategy, "theirs"))
 789                         o.strategy = NOTES_MERGE_RESOLVE_THEIRS;
 790                 else if (!strcmp(strategy, "union"))
 791                         o.strategy = NOTES_MERGE_RESOLVE_UNION;
 792                 else if (!strcmp(strategy, "cat_sort_uniq"))
 793                         o.strategy = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
 794                 else {
 795                         error("Unknown -s/--strategy: %s", strategy);
 796                         usage_with_options(git_notes_merge_usage, options);
 797                 }
 798         }
 799
 800         t = init_notes_check("merge");
 801
 802         strbuf_addf(&msg, "notes: Merged notes from %s into %s",
 803                     remote_ref.buf, default_notes_ref());
 804         strbuf_add(&(o.commit_msg), msg.buf + 7, msg.len - 7); /* skip "notes: " */
 805
 806         result = notes_merge(&o, t, result_sha1);
 807
 808         if (result >= 0) /* Merge resulted (trivially) in result_sha1 */
 809                 /* Update default notes ref with new commit */
 810                 update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
 811                            0, DIE_ON_ERR);
 812         else { /* Merge has unresolved conflicts */
 813                 /* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
 814                 update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, NULL,
 815                            0, DIE_ON_ERR);
 816                 /* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
 817                 if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
 818                         die("Failed to store link to current notes ref (%s)",
 819                             default_notes_ref());
 820                 printf("Automatic notes merge failed. Fix conflicts in %s and "
 821                        "commit the result with 'git notes merge --commit', or "
 822                        "abort the merge with 'git notes merge --abort'.\n",
 823                        git_path(NOTES_MERGE_WORKTREE));
 824         }
 825
 826         free_notes(t);
 827         strbuf_release(&remote_ref);
 828         strbuf_release(&msg);
 829         return result < 0; /* return non-zero on conflicts */
 830 }
 831
 832 #define IGNORE_MISSING 1
 833
 834 static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag)
 835 {
 836         int status;
 837         unsigned char sha1[20];
 838         if (get_sha1(name, sha1))
 839                 return error(_("Failed to resolve '%s' as a valid ref."), name);
 840         status = remove_note(t, sha1);
 841         if (status)
 842                 fprintf(stderr, _("Object %s has no note\n"), name);
 843         else
 844                 fprintf(stderr, _("Removing note for object %s\n"), name);
 845         return (flag & IGNORE_MISSING) ? 0 : status;
 846 }
 847
 848 static int remove_cmd(int argc, const char **argv, const char *prefix)
 849 {
 850         unsigned flag = 0;
 851         int from_stdin = 0;
 852         struct option options[] = {
 853                 OPT_BIT(0, "ignore-missing", &flag,
 854                         N_("attempt to remove non-existent note is not an error"),
 855                         IGNORE_MISSING),
 856                 OPT_BOOL(0, "stdin", &from_stdin,
 857                             N_("read object names from the standard input")),
 858                 OPT_END()
 859         };
 860         struct notes_tree *t;
 861         int retval = 0;
 862
 863         argc = parse_options(argc, argv, prefix, options,
 864                              git_notes_remove_usage, 0);
 865
 866         t = init_notes_check("remove");
 867
 868         if (!argc && !from_stdin) {
 869                 retval = remove_one_note(t, "HEAD", flag);
 870         } else {
 871                 while (*argv) {
 872                         retval |= remove_one_note(t, *argv, flag);
 873                         argv++;
 874                 }
 875         }
 876         if (from_stdin) {
 877                 struct strbuf sb = STRBUF_INIT;
 878                 while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
 879                         strbuf_rtrim(&sb);
 880                         retval |= remove_one_note(t, sb.buf, flag);
 881                 }
 882                 strbuf_release(&sb);
 883         }
 884         if (!retval)
 885                 commit_notes(t, "Notes removed by 'git notes remove'");
 886         free_notes(t);
 887         return retval;
 888 }
 889
 890 static int prune(int argc, const char **argv, const char *prefix)
 891 {
 892         struct notes_tree *t;
 893         int show_only = 0, verbose = 0;
 894         struct option options[] = {
 895                 OPT__DRY_RUN(&show_only, "do not remove, show only"),
 896                 OPT__VERBOSE(&verbose, "report pruned notes"),
 897                 OPT_END()
 898         };
 899
 900         argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
 901                              0);
 902
 903         if (argc) {
 904                 error(_("too many parameters"));
 905                 usage_with_options(git_notes_prune_usage, options);
 906         }
 907
 908         t = init_notes_check("prune");
 909
 910         prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
 911                 (show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
 912         if (!show_only)
 913                 commit_notes(t, "Notes removed by 'git notes prune'");
 914         free_notes(t);
 915         return 0;
 916 }
 917
 918 static int get_ref(int argc, const char **argv, const char *prefix)
 919 {
 920         struct option options[] = { OPT_END() };
 921         argc = parse_options(argc, argv, prefix, options,
 922                              git_notes_get_ref_usage, 0);
 923
 924         if (argc) {
 925                 error("too many parameters");
 926                 usage_with_options(git_notes_get_ref_usage, options);
 927         }
 928
 929         puts(default_notes_ref());
 930         return 0;
 931 }
 932
 933 int cmd_notes(int argc, const char **argv, const char *prefix)
 934 {
 935         int result;
 936         const char *override_notes_ref = NULL;
 937         struct option options[] = {
 938                 OPT_STRING(0, "ref", &override_notes_ref, N_("notes_ref"),
 939                            N_("use notes from <notes_ref>")),
 940                 OPT_END()
 941         };
 942
 943         git_config(git_default_config, NULL);
 944         argc = parse_options(argc, argv, prefix, options, git_notes_usage,
 945                              PARSE_OPT_STOP_AT_NON_OPTION);
 946
 947         if (override_notes_ref) {
 948                 struct strbuf sb = STRBUF_INIT;
 949                 strbuf_addstr(&sb, override_notes_ref);
 950                 expand_notes_ref(&sb);
 951                 setenv("GIT_NOTES_REF", sb.buf, 1);
 952                 strbuf_release(&sb);
 953         }
 954
 955         if (argc < 1 || !strcmp(argv[0], "list"))
 956                 result = list(argc, argv, prefix);
 957         else if (!strcmp(argv[0], "add"))
 958                 result = add(argc, argv, prefix);
 959         else if (!strcmp(argv[0], "copy"))
 960                 result = copy(argc, argv, prefix);
 961         else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
 962                 result = append_edit(argc, argv, prefix);
 963         else if (!strcmp(argv[0], "show"))
 964                 result = show(argc, argv, prefix);
 965         else if (!strcmp(argv[0], "merge"))
 966                 result = merge(argc, argv, prefix);
 967         else if (!strcmp(argv[0], "remove"))
 968                 result = remove_cmd(argc, argv, prefix);
 969         else if (!strcmp(argv[0], "prune"))
 970                 result = prune(argc, argv, prefix);
 971         else if (!strcmp(argv[0], "get-ref"))
 972                 result = get_ref(argc, argv, prefix);
 973         else {
 974                 result = error(_("Unknown subcommand: %s"), argv[0]);
 975                 usage_with_options(git_notes_usage, options);
 976         }
 977
 978         return result ? 1 : 0;
 979 }