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
  22 static const char * const git_notes_usage[] = {
  23         "git notes [--ref <notes_ref>] [list [<object>]]",
  24         "git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  25         "git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>",
  26         "git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  27         "git notes [--ref <notes_ref>] edit [<object>]",
  28         "git notes [--ref <notes_ref>] show [<object>]",
  29         "git notes [--ref <notes_ref>] merge [-v | -q] [-s <strategy> ] <notes_ref>",
  30         "git notes merge --commit [-v | -q]",
  31         "git notes merge --abort [-v | -q]",
  32         "git notes [--ref <notes_ref>] remove [<object>]",
  33         "git notes [--ref <notes_ref>] prune [-n | -v]",
  34         "git notes [--ref <notes_ref>] get-ref",
  35         NULL
  36 };
  37
  38 static const char * const git_notes_list_usage[] = {
  39         "git notes [list [<object>]]",
  40         NULL
  41 };
  42
  43 static const char * const git_notes_add_usage[] = {
  44         "git notes add [<options>] [<object>]",
  45         NULL
  46 };
  47
  48 static const char * const git_notes_copy_usage[] = {
  49         "git notes copy [<options>] <from-object> <to-object>",
  50         "git notes copy --stdin [<from-object> <to-object>]...",
  51         NULL
  52 };
  53
  54 static const char * const git_notes_append_usage[] = {
  55         "git notes append [<options>] [<object>]",
  56         NULL
  57 };
  58
  59 static const char * const git_notes_edit_usage[] = {
  60         "git notes edit [<object>]",
  61         NULL
  62 };
  63
  64 static const char * const git_notes_show_usage[] = {
  65         "git notes show [<object>]",
  66         NULL
  67 };
  68
  69 static const char * const git_notes_merge_usage[] = {
  70         "git notes merge [<options>] <notes_ref>",
  71         "git notes merge --commit [<options>]",
  72         "git notes merge --abort [<options>]",
  73         NULL
  74 };
  75
  76 static const char * const git_notes_remove_usage[] = {
  77         "git notes remove [<object>]",
  78         NULL
  79 };
  80
  81 static const char * const git_notes_prune_usage[] = {
  82         "git notes prune [<options>]",
  83         NULL
  84 };
  85
  86 static const char * const git_notes_get_ref_usage[] = {
  87         "git notes get-ref",
  88         NULL
  89 };
  90
  91 static const char note_template[] =
  92         "\n"
  93         "#\n"
  94         "# Write/edit the notes for the following object:\n"
  95         "#\n";
  96
  97 struct msg_arg {
  98         int given;
  99         int use_editor;
 100         struct strbuf buf;
 101 };
 102
 103 static void expand_notes_ref(struct strbuf *sb)
 104 {
 105         if (!prefixcmp(sb->buf, "refs/notes/"))
 106                 return; /* we're happy */
 107         else if (!prefixcmp(sb->buf, "notes/"))
 108                 strbuf_insert(sb, 0, "refs/", 5);
 109         else
 110                 strbuf_insert(sb, 0, "refs/notes/", 11);
 111 }
 112
 113 static int list_each_note(const unsigned char *object_sha1,
 114                 const unsigned char *note_sha1, char *note_path,
 115                 void *cb_data)
 116 {
 117         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
 118         return 0;
 119 }
 120
 121 static void write_note_data(int fd, const unsigned char *sha1)
 122 {
 123         unsigned long size;
 124         enum object_type type;
 125         char *buf = read_sha1_file(sha1, &type, &size);
 126         if (buf) {
 127                 if (size)
 128                         write_or_die(fd, buf, size);
 129                 free(buf);
 130         }
 131 }
 132
 133 static void write_commented_object(int fd, const unsigned char *object)
 134 {
 135         const char *show_args[5] =
 136                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
 137         struct child_process show;
 138         struct strbuf buf = STRBUF_INIT;
 139         FILE *show_out;
 140
 141         /* Invoke "git show --stat --no-notes $object" */
 142         memset(&show, 0, sizeof(show));
 143         show.argv = show_args;
 144         show.no_stdin = 1;
 145         show.out = -1;
 146         show.err = 0;
 147         show.git_cmd = 1;
 148         if (start_command(&show))
 149                 die("unable to start 'show' for object '%s'",
 150                     sha1_to_hex(object));
 151
 152         /* Open the output as FILE* so strbuf_getline() can be used. */
 153         show_out = xfdopen(show.out, "r");
 154         if (show_out == NULL)
 155                 die_errno("can't fdopen 'show' output fd");
 156
 157         /* Prepend "# " to each output line and write result to 'fd' */
 158         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
 159                 write_or_die(fd, "# ", 2);
 160                 write_or_die(fd, buf.buf, buf.len);
 161                 write_or_die(fd, "\n", 1);
 162         }
 163         strbuf_release(&buf);
 164         if (fclose(show_out))
 165                 die_errno("failed to close pipe to 'show' for object '%s'",
 166                           sha1_to_hex(object));
 167         if (finish_command(&show))
 168                 die("failed to finish 'show' for object '%s'",
 169                     sha1_to_hex(object));
 170 }
 171
 172 static void create_note(const unsigned char *object, struct msg_arg *msg,
 173                         int append_only, const unsigned char *prev,
 174                         unsigned char *result)
 175 {
 176         char *path = NULL;
 177
 178         if (msg->use_editor || !msg->given) {
 179                 int fd;
 180
 181                 /* write the template message before editing: */
 182                 path = git_pathdup("NOTES_EDITMSG");
 183                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 184                 if (fd < 0)
 185                         die_errno("could not create file '%s'", path);
 186
 187                 if (msg->given)
 188                         write_or_die(fd, msg->buf.buf, msg->buf.len);
 189                 else if (prev && !append_only)
 190                         write_note_data(fd, prev);
 191                 write_or_die(fd, note_template, strlen(note_template));
 192
 193                 write_commented_object(fd, object);
 194
 195                 close(fd);
 196                 strbuf_reset(&(msg->buf));
 197
 198                 if (launch_editor(path, &(msg->buf), NULL)) {
 199                         die("Please supply the note contents using either -m" \
 200                             " or -F option");
 201                 }
 202                 stripspace(&(msg->buf), 1);
 203         }
 204
 205         if (prev && append_only) {
 206                 /* Append buf to previous note contents */
 207                 unsigned long size;
 208                 enum object_type type;
 209                 char *prev_buf = read_sha1_file(prev, &type, &size);
 210
 211                 strbuf_grow(&(msg->buf), size + 1);
 212                 if (msg->buf.len && prev_buf && size)
 213                         strbuf_insert(&(msg->buf), 0, "\n", 1);
 214                 if (prev_buf && size)
 215                         strbuf_insert(&(msg->buf), 0, prev_buf, size);
 216                 free(prev_buf);
 217         }
 218
 219         if (!msg->buf.len) {
 220                 fprintf(stderr, "Removing note for object %s\n",
 221                         sha1_to_hex(object));
 222                 hashclr(result);
 223         } else {
 224                 if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
 225                         error("unable to write note object");
 226                         if (path)
 227                                 error("The note contents has been left in %s",
 228                                       path);
 229                         exit(128);
 230                 }
 231         }
 232
 233         if (path) {
 234                 unlink_or_warn(path);
 235                 free(path);
 236         }
 237 }
 238
 239 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 240 {
 241         struct msg_arg *msg = opt->value;
 242
 243         strbuf_grow(&(msg->buf), strlen(arg) + 2);
 244         if (msg->buf.len)
 245                 strbuf_addch(&(msg->buf), '\n');
 246         strbuf_addstr(&(msg->buf), arg);
 247         stripspace(&(msg->buf), 0);
 248
 249         msg->given = 1;
 250         return 0;
 251 }
 252
 253 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 254 {
 255         struct msg_arg *msg = opt->value;
 256
 257         if (msg->buf.len)
 258                 strbuf_addch(&(msg->buf), '\n');
 259         if (!strcmp(arg, "-")) {
 260                 if (strbuf_read(&(msg->buf), 0, 1024) < 0)
 261                         die_errno("cannot read '%s'", arg);
 262         } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
 263                 die_errno("could not open or read '%s'", arg);
 264         stripspace(&(msg->buf), 0);
 265
 266         msg->given = 1;
 267         return 0;
 268 }
 269
 270 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 271 {
 272         struct msg_arg *msg = opt->value;
 273         char *buf;
 274         unsigned char object[20];
 275         enum object_type type;
 276         unsigned long len;
 277
 278         if (msg->buf.len)
 279                 strbuf_addch(&(msg->buf), '\n');
 280
 281         if (get_sha1(arg, object))
 282                 die("Failed to resolve '%s' as a valid ref.", arg);
 283         if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
 284                 free(buf);
 285                 die("Failed to read object '%s'.", arg);;
 286         }
 287         strbuf_add(&(msg->buf), buf, len);
 288         free(buf);
 289
 290         msg->given = 1;
 291         return 0;
 292 }
 293
 294 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 295 {
 296         struct msg_arg *msg = opt->value;
 297         msg->use_editor = 1;
 298         return parse_reuse_arg(opt, arg, unset);
 299 }
 300
 301 void commit_notes(struct notes_tree *t, const char *msg)
 302 {
 303         struct strbuf buf = STRBUF_INIT;
 304         unsigned char commit_sha1[20];
 305
 306         if (!t)
 307                 t = &default_notes_tree;
 308         if (!t->initialized || !t->ref || !*t->ref)
 309                 die("Cannot commit uninitialized/unreferenced notes tree");
 310         if (!t->dirty)
 311                 return; /* don't have to commit an unchanged tree */
 312
 313         /* Prepare commit message and reflog message */
 314         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 315         strbuf_addstr(&buf, msg);
 316         if (buf.buf[buf.len - 1] != '\n')
 317                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 318
 319         create_notes_commit(t, NULL, buf.buf + 7, commit_sha1);
 320         update_ref(buf.buf, t->ref, commit_sha1, NULL, 0, DIE_ON_ERR);
 321
 322         strbuf_release(&buf);
 323 }
 324
 325 combine_notes_fn parse_combine_notes_fn(const char *v)
 326 {
 327         if (!strcasecmp(v, "overwrite"))
 328                 return combine_notes_overwrite;
 329         else if (!strcasecmp(v, "ignore"))
 330                 return combine_notes_ignore;
 331         else if (!strcasecmp(v, "concatenate"))
 332                 return combine_notes_concatenate;
 333         else if (!strcasecmp(v, "cat_sort_uniq"))
 334                 return combine_notes_cat_sort_uniq;
 335         else
 336                 return NULL;
 337 }
 338
 339 static int notes_rewrite_config(const char *k, const char *v, void *cb)
 340 {
 341         struct notes_rewrite_cfg *c = cb;
 342         if (!prefixcmp(k, "notes.rewrite.") && !strcmp(k+14, c->cmd)) {
 343                 c->enabled = git_config_bool(k, v);
 344                 return 0;
 345         } else if (!c->mode_from_env && !strcmp(k, "notes.rewritemode")) {
 346                 if (!v)
 347                         config_error_nonbool(k);
 348                 c->combine = parse_combine_notes_fn(v);
 349                 if (!c->combine) {
 350                         error("Bad notes.rewriteMode value: '%s'", v);
 351                         return 1;
 352                 }
 353                 return 0;
 354         } else if (!c->refs_from_env && !strcmp(k, "notes.rewriteref")) {
 355                 /* note that a refs/ prefix is implied in the
 356                  * underlying for_each_glob_ref */
 357                 if (!prefixcmp(v, "refs/notes/"))
 358                         string_list_add_refs_by_glob(c->refs, v);
 359                 else
 360                         warning("Refusing to rewrite notes in %s"
 361                                 " (outside of refs/notes/)", v);
 362                 return 0;
 363         }
 364
 365         return 0;
 366 }
 367
 368
 369 struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd)
 370 {
 371         struct notes_rewrite_cfg *c = xmalloc(sizeof(struct notes_rewrite_cfg));
 372         const char *rewrite_mode_env = getenv(GIT_NOTES_REWRITE_MODE_ENVIRONMENT);
 373         const char *rewrite_refs_env = getenv(GIT_NOTES_REWRITE_REF_ENVIRONMENT);
 374         c->cmd = cmd;
 375         c->enabled = 1;
 376         c->combine = combine_notes_concatenate;
 377         c->refs = xcalloc(1, sizeof(struct string_list));
 378         c->refs->strdup_strings = 1;
 379         c->refs_from_env = 0;
 380         c->mode_from_env = 0;
 381         if (rewrite_mode_env) {
 382                 c->mode_from_env = 1;
 383                 c->combine = parse_combine_notes_fn(rewrite_mode_env);
 384                 if (!c->combine)
 385                         error("Bad " GIT_NOTES_REWRITE_MODE_ENVIRONMENT
 386                               " value: '%s'", rewrite_mode_env);
 387         }
 388         if (rewrite_refs_env) {
 389                 c->refs_from_env = 1;
 390                 string_list_add_refs_from_colon_sep(c->refs, rewrite_refs_env);
 391         }
 392         git_config(notes_rewrite_config, c);
 393         if (!c->enabled || !c->refs->nr) {
 394                 string_list_clear(c->refs, 0);
 395                 free(c->refs);
 396                 free(c);
 397                 return NULL;
 398         }
 399         c->trees = load_notes_trees(c->refs);
 400         string_list_clear(c->refs, 0);
 401         free(c->refs);
 402         return c;
 403 }
 404
 405 int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
 406                           const unsigned char *from_obj, const unsigned char *to_obj)
 407 {
 408         int ret = 0;
 409         int i;
 410         for (i = 0; c->trees[i]; i++)
 411                 ret = copy_note(c->trees[i], from_obj, to_obj, 1, c->combine) || ret;
 412         return ret;
 413 }
 414
 415 void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c)
 416 {
 417         int i;
 418         for (i = 0; c->trees[i]; i++) {
 419                 commit_notes(c->trees[i], "Notes added by 'git notes copy'");
 420                 free_notes(c->trees[i]);
 421         }
 422         free(c->trees);
 423         free(c);
 424 }
 425
 426 int notes_copy_from_stdin(int force, const char *rewrite_cmd)
 427 {
 428         struct strbuf buf = STRBUF_INIT;
 429         struct notes_rewrite_cfg *c = NULL;
 430         struct notes_tree *t = NULL;
 431         int ret = 0;
 432
 433         if (rewrite_cmd) {
 434                 c = init_copy_notes_for_rewrite(rewrite_cmd);
 435                 if (!c)
 436                         return 0;
 437         } else {
 438                 init_notes(NULL, NULL, NULL, 0);
 439                 t = &default_notes_tree;
 440         }
 441
 442         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 443                 unsigned char from_obj[20], to_obj[20];
 444                 struct strbuf **split;
 445                 int err;
 446
 447                 split = strbuf_split(&buf, ' ');
 448                 if (!split[0] || !split[1])
 449                         die("Malformed input line: '%s'.", buf.buf);
 450                 strbuf_rtrim(split[0]);
 451                 strbuf_rtrim(split[1]);
 452                 if (get_sha1(split[0]->buf, from_obj))
 453                         die("Failed to resolve '%s' as a valid ref.", split[0]->buf);
 454                 if (get_sha1(split[1]->buf, to_obj))
 455                         die("Failed to resolve '%s' as a valid ref.", split[1]->buf);
 456
 457                 if (rewrite_cmd)
 458                         err = copy_note_for_rewrite(c, from_obj, to_obj);
 459                 else
 460                         err = copy_note(t, from_obj, to_obj, force,
 461                                         combine_notes_overwrite);
 462
 463                 if (err) {
 464                         error("Failed to copy notes from '%s' to '%s'",
 465                               split[0]->buf, split[1]->buf);
 466                         ret = 1;
 467                 }
 468
 469                 strbuf_list_free(split);
 470         }
 471
 472         if (!rewrite_cmd) {
 473                 commit_notes(t, "Notes added by 'git notes copy'");
 474                 free_notes(t);
 475         } else {
 476                 finish_copy_notes_for_rewrite(c);
 477         }
 478         return ret;
 479 }
 480
 481 static struct notes_tree *init_notes_check(const char *subcommand)
 482 {
 483         struct notes_tree *t;
 484         init_notes(NULL, NULL, NULL, 0);
 485         t = &default_notes_tree;
 486
 487         if (prefixcmp(t->ref, "refs/notes/"))
 488                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 489                     subcommand, t->ref);
 490         return t;
 491 }
 492
 493 static int list(int argc, const char **argv, const char *prefix)
 494 {
 495         struct notes_tree *t;
 496         unsigned char object[20];
 497         const unsigned char *note;
 498         int retval = -1;
 499         struct option options[] = {
 500                 OPT_END()
 501         };
 502
 503         if (argc)
 504                 argc = parse_options(argc, argv, prefix, options,
 505                                      git_notes_list_usage, 0);
 506
 507         if (1 < argc) {
 508                 error("too many parameters");
 509                 usage_with_options(git_notes_list_usage, options);
 510         }
 511
 512         t = init_notes_check("list");
 513         if (argc) {
 514                 if (get_sha1(argv[0], object))
 515                         die("Failed to resolve '%s' as a valid ref.", argv[0]);
 516                 note = get_note(t, object);
 517                 if (note) {
 518                         puts(sha1_to_hex(note));
 519                         retval = 0;
 520                 } else
 521                         retval = error("No note found for object %s.",
 522                                        sha1_to_hex(object));
 523         } else
 524                 retval = for_each_note(t, 0, list_each_note, NULL);
 525
 526         free_notes(t);
 527         return retval;
 528 }
 529
 530 static int add(int argc, const char **argv, const char *prefix)
 531 {
 532         int retval = 0, force = 0;
 533         const char *object_ref;
 534         struct notes_tree *t;
 535         unsigned char object[20], new_note[20];
 536         char logmsg[100];
 537         const unsigned char *note;
 538         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 539         struct option options[] = {
 540                 { OPTION_CALLBACK, 'm', "message", &msg, "MSG",
 541                         "note contents as a string", PARSE_OPT_NONEG,
 542                         parse_msg_arg},
 543                 { OPTION_CALLBACK, 'F', "file", &msg, "FILE",
 544                         "note contents in a file", PARSE_OPT_NONEG,
 545                         parse_file_arg},
 546                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
 547                         "reuse and edit specified note object", PARSE_OPT_NONEG,
 548                         parse_reedit_arg},
 549                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
 550                         "reuse specified note object", PARSE_OPT_NONEG,
 551                         parse_reuse_arg},
 552                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 553                 OPT_END()
 554         };
 555
 556         argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
 557                              0);
 558
 559         if (1 < argc) {
 560                 error("too many parameters");
 561                 usage_with_options(git_notes_add_usage, options);
 562         }
 563
 564         object_ref = argc ? argv[0] : "HEAD";
 565
 566         if (get_sha1(object_ref, object))
 567                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 568
 569         t = init_notes_check("add");
 570         note = get_note(t, object);
 571
 572         if (note) {
 573                 if (!force) {
 574                         retval = error("Cannot add notes. Found existing notes "
 575                                        "for object %s. Use '-f' to overwrite "
 576                                        "existing notes", sha1_to_hex(object));
 577                         goto out;
 578                 }
 579                 fprintf(stderr, "Overwriting existing notes for object %s\n",
 580                         sha1_to_hex(object));
 581         }
 582
 583         create_note(object, &msg, 0, note, new_note);
 584
 585         if (is_null_sha1(new_note))
 586                 remove_note(t, object);
 587         else if (add_note(t, object, new_note, combine_notes_overwrite))
 588                 die("BUG: combine_notes_overwrite failed");
 589
 590         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 591                  is_null_sha1(new_note) ? "removed" : "added", "add");
 592         commit_notes(t, logmsg);
 593 out:
 594         free_notes(t);
 595         strbuf_release(&(msg.buf));
 596         return retval;
 597 }
 598
 599 static int copy(int argc, const char **argv, const char *prefix)
 600 {
 601         int retval = 0, force = 0, from_stdin = 0;
 602         const unsigned char *from_note, *note;
 603         const char *object_ref;
 604         unsigned char object[20], from_obj[20];
 605         struct notes_tree *t;
 606         const char *rewrite_cmd = NULL;
 607         struct option options[] = {
 608                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 609                 OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
 610                 OPT_STRING(0, "for-rewrite", &rewrite_cmd, "command",
 611                            "load rewriting config for <command> (implies "
 612                            "--stdin)"),
 613                 OPT_END()
 614         };
 615
 616         argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
 617                              0);
 618
 619         if (from_stdin || rewrite_cmd) {
 620                 if (argc) {
 621                         error("too many parameters");
 622                         usage_with_options(git_notes_copy_usage, options);
 623                 } else {
 624                         return notes_copy_from_stdin(force, rewrite_cmd);
 625                 }
 626         }
 627
 628         if (argc < 2) {
 629                 error("too few parameters");
 630                 usage_with_options(git_notes_copy_usage, options);
 631         }
 632         if (2 < argc) {
 633                 error("too many parameters");
 634                 usage_with_options(git_notes_copy_usage, options);
 635         }
 636
 637         if (get_sha1(argv[0], from_obj))
 638                 die("Failed to resolve '%s' as a valid ref.", argv[0]);
 639
 640         object_ref = 1 < argc ? argv[1] : "HEAD";
 641
 642         if (get_sha1(object_ref, object))
 643                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 644
 645         t = init_notes_check("copy");
 646         note = get_note(t, object);
 647
 648         if (note) {
 649                 if (!force) {
 650                         retval = error("Cannot copy notes. Found existing "
 651                                        "notes for object %s. Use '-f' to "
 652                                        "overwrite existing notes",
 653                                        sha1_to_hex(object));
 654                         goto out;
 655                 }
 656                 fprintf(stderr, "Overwriting existing notes for object %s\n",
 657                         sha1_to_hex(object));
 658         }
 659
 660         from_note = get_note(t, from_obj);
 661         if (!from_note) {
 662                 retval = error("Missing notes on source object %s. Cannot "
 663                                "copy.", sha1_to_hex(from_obj));
 664                 goto out;
 665         }
 666
 667         if (add_note(t, object, from_note, combine_notes_overwrite))
 668                 die("BUG: combine_notes_overwrite failed");
 669         commit_notes(t, "Notes added by 'git notes copy'");
 670 out:
 671         free_notes(t);
 672         return retval;
 673 }
 674
 675 static int append_edit(int argc, const char **argv, const char *prefix)
 676 {
 677         const char *object_ref;
 678         struct notes_tree *t;
 679         unsigned char object[20], new_note[20];
 680         const unsigned char *note;
 681         char logmsg[100];
 682         const char * const *usage;
 683         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 684         struct option options[] = {
 685                 { OPTION_CALLBACK, 'm', "message", &msg, "MSG",
 686                         "note contents as a string", PARSE_OPT_NONEG,
 687                         parse_msg_arg},
 688                 { OPTION_CALLBACK, 'F', "file", &msg, "FILE",
 689                         "note contents in a file", PARSE_OPT_NONEG,
 690                         parse_file_arg},
 691                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
 692                         "reuse and edit specified note object", PARSE_OPT_NONEG,
 693                         parse_reedit_arg},
 694                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
 695                         "reuse specified note object", PARSE_OPT_NONEG,
 696                         parse_reuse_arg},
 697                 OPT_END()
 698         };
 699         int edit = !strcmp(argv[0], "edit");
 700
 701         usage = edit ? git_notes_edit_usage : git_notes_append_usage;
 702         argc = parse_options(argc, argv, prefix, options, usage,
 703                              PARSE_OPT_KEEP_ARGV0);
 704
 705         if (2 < argc) {
 706                 error("too many parameters");
 707                 usage_with_options(usage, options);
 708         }
 709
 710         if (msg.given && edit)
 711                 fprintf(stderr, "The -m/-F/-c/-C options have been deprecated "
 712                         "for the 'edit' subcommand.\n"
 713                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n");
 714
 715         object_ref = 1 < argc ? argv[1] : "HEAD";
 716
 717         if (get_sha1(object_ref, object))
 718                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 719
 720         t = init_notes_check(argv[0]);
 721         note = get_note(t, object);
 722
 723         create_note(object, &msg, !edit, note, new_note);
 724
 725         if (is_null_sha1(new_note))
 726                 remove_note(t, object);
 727         else if (add_note(t, object, new_note, combine_notes_overwrite))
 728                 die("BUG: combine_notes_overwrite failed");
 729
 730         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 731                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 732         commit_notes(t, logmsg);
 733         free_notes(t);
 734         strbuf_release(&(msg.buf));
 735         return 0;
 736 }
 737
 738 static int show(int argc, const char **argv, const char *prefix)
 739 {
 740         const char *object_ref;
 741         struct notes_tree *t;
 742         unsigned char object[20];
 743         const unsigned char *note;
 744         int retval;
 745         struct option options[] = {
 746                 OPT_END()
 747         };
 748
 749         argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
 750                              0);
 751
 752         if (1 < argc) {
 753                 error("too many parameters");
 754                 usage_with_options(git_notes_show_usage, options);
 755         }
 756
 757         object_ref = argc ? argv[0] : "HEAD";
 758
 759         if (get_sha1(object_ref, object))
 760                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 761
 762         t = init_notes_check("show");
 763         note = get_note(t, object);
 764
 765         if (!note)
 766                 retval = error("No note found for object %s.",
 767                                sha1_to_hex(object));
 768         else {
 769                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 770                 retval = execv_git_cmd(show_args);
 771         }
 772         free_notes(t);
 773         return retval;
 774 }
 775
 776 static int merge_abort(struct notes_merge_options *o)
 777 {
 778         int ret = 0;
 779
 780         /*
 781          * Remove .git/NOTES_MERGE_PARTIAL and .git/NOTES_MERGE_REF, and call
 782          * notes_merge_abort() to remove .git/NOTES_MERGE_WORKTREE.
 783          */
 784
 785         if (delete_ref("NOTES_MERGE_PARTIAL", NULL, 0))
 786                 ret += error("Failed to delete ref NOTES_MERGE_PARTIAL");
 787         if (delete_ref("NOTES_MERGE_REF", NULL, REF_NODEREF))
 788                 ret += error("Failed to delete ref NOTES_MERGE_REF");
 789         if (notes_merge_abort(o))
 790                 ret += error("Failed to remove 'git notes merge' worktree");
 791         return ret;
 792 }
 793
 794 static int merge_commit(struct notes_merge_options *o)
 795 {
 796         struct strbuf msg = STRBUF_INIT;
 797         unsigned char sha1[20], parent_sha1[20];
 798         struct notes_tree *t;
 799         struct commit *partial;
 800         struct pretty_print_context pretty_ctx;
 801
 802         /*
 803          * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
 804          * and target notes ref from .git/NOTES_MERGE_REF.
 805          */
 806
 807         if (get_sha1("NOTES_MERGE_PARTIAL", sha1))
 808                 die("Failed to read ref NOTES_MERGE_PARTIAL");
 809         else if (!(partial = lookup_commit_reference(sha1)))
 810                 die("Could not find commit from NOTES_MERGE_PARTIAL.");
 811         else if (parse_commit(partial))
 812                 die("Could not parse commit from NOTES_MERGE_PARTIAL.");
 813
 814         if (partial->parents)
 815                 hashcpy(parent_sha1, partial->parents->item->object.sha1);
 816         else
 817                 hashclr(parent_sha1);
 818
 819         t = xcalloc(1, sizeof(struct notes_tree));
 820         init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
 821
 822         o->local_ref = resolve_ref("NOTES_MERGE_REF", sha1, 0, 0);
 823         if (!o->local_ref)
 824                 die("Failed to resolve NOTES_MERGE_REF");
 825
 826         if (notes_merge_commit(o, t, partial, sha1))
 827                 die("Failed to finalize notes merge");
 828
 829         /* Reuse existing commit message in reflog message */
 830         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
 831         format_commit_message(partial, "%s", &msg, &pretty_ctx);
 832         strbuf_trim(&msg);
 833         strbuf_insert(&msg, 0, "notes: ", 7);
 834         update_ref(msg.buf, o->local_ref, sha1,
 835                    is_null_sha1(parent_sha1) ? NULL : parent_sha1,
 836                    0, DIE_ON_ERR);
 837
 838         free_notes(t);
 839         strbuf_release(&msg);
 840         return merge_abort(o);
 841 }
 842
 843 static int merge(int argc, const char **argv, const char *prefix)
 844 {
 845         struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
 846         unsigned char result_sha1[20];
 847         struct notes_tree *t;
 848         struct notes_merge_options o;
 849         int do_merge = 0, do_commit = 0, do_abort = 0;
 850         int verbosity = 0, result;
 851         const char *strategy = NULL;
 852         struct option options[] = {
 853                 OPT_GROUP("General options"),
 854                 OPT__VERBOSITY(&verbosity),
 855                 OPT_GROUP("Merge options"),
 856                 OPT_STRING('s', "strategy", &strategy, "strategy",
 857                            "resolve notes conflicts using the given strategy "
 858                            "(manual/ours/theirs/union/cat_sort_uniq)"),
 859                 OPT_GROUP("Committing unmerged notes"),
 860                 { OPTION_BOOLEAN, 0, "commit", &do_commit, NULL,
 861                         "finalize notes merge by committing unmerged notes",
 862                         PARSE_OPT_NOARG | PARSE_OPT_NONEG },
 863                 OPT_GROUP("Aborting notes merge resolution"),
 864                 { OPTION_BOOLEAN, 0, "abort", &do_abort, NULL,
 865                         "abort notes merge",
 866                         PARSE_OPT_NOARG | PARSE_OPT_NONEG },
 867                 OPT_END()
 868         };
 869
 870         argc = parse_options(argc, argv, prefix, options,
 871                              git_notes_merge_usage, 0);
 872
 873         if (strategy || do_commit + do_abort == 0)
 874                 do_merge = 1;
 875         if (do_merge + do_commit + do_abort != 1) {
 876                 error("cannot mix --commit, --abort or -s/--strategy");
 877                 usage_with_options(git_notes_merge_usage, options);
 878         }
 879
 880         if (do_merge && argc != 1) {
 881                 error("Must specify a notes ref to merge");
 882                 usage_with_options(git_notes_merge_usage, options);
 883         } else if (!do_merge && argc) {
 884                 error("too many parameters");
 885                 usage_with_options(git_notes_merge_usage, options);
 886         }
 887
 888         init_notes_merge_options(&o);
 889         o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
 890
 891         if (do_abort)
 892                 return merge_abort(&o);
 893         if (do_commit)
 894                 return merge_commit(&o);
 895
 896         o.local_ref = default_notes_ref();
 897         strbuf_addstr(&remote_ref, argv[0]);
 898         expand_notes_ref(&remote_ref);
 899         o.remote_ref = remote_ref.buf;
 900
 901         if (strategy) {
 902                 if (!strcmp(strategy, "manual"))
 903                         o.strategy = NOTES_MERGE_RESOLVE_MANUAL;
 904                 else if (!strcmp(strategy, "ours"))
 905                         o.strategy = NOTES_MERGE_RESOLVE_OURS;
 906                 else if (!strcmp(strategy, "theirs"))
 907                         o.strategy = NOTES_MERGE_RESOLVE_THEIRS;
 908                 else if (!strcmp(strategy, "union"))
 909                         o.strategy = NOTES_MERGE_RESOLVE_UNION;
 910                 else if (!strcmp(strategy, "cat_sort_uniq"))
 911                         o.strategy = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
 912                 else {
 913                         error("Unknown -s/--strategy: %s", strategy);
 914                         usage_with_options(git_notes_merge_usage, options);
 915                 }
 916         }
 917
 918         t = init_notes_check("merge");
 919
 920         strbuf_addf(&msg, "notes: Merged notes from %s into %s",
 921                     remote_ref.buf, default_notes_ref());
 922         strbuf_add(&(o.commit_msg), msg.buf + 7, msg.len - 7); /* skip "notes: " */
 923
 924         result = notes_merge(&o, t, result_sha1);
 925
 926         if (result >= 0) /* Merge resulted (trivially) in result_sha1 */
 927                 /* Update default notes ref with new commit */
 928                 update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
 929                            0, DIE_ON_ERR);
 930         else { /* Merge has unresolved conflicts */
 931                 /* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
 932                 update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, NULL,
 933                            0, DIE_ON_ERR);
 934                 /* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
 935                 if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
 936                         die("Failed to store link to current notes ref (%s)",
 937                             default_notes_ref());
 938                 printf("Automatic notes merge failed. Fix conflicts in %s and "
 939                        "commit the result with 'git notes merge --commit', or "
 940                        "abort the merge with 'git notes merge --abort'.\n",
 941                        git_path(NOTES_MERGE_WORKTREE));
 942         }
 943
 944         free_notes(t);
 945         strbuf_release(&remote_ref);
 946         strbuf_release(&msg);
 947         return result < 0; /* return non-zero on conflicts */
 948 }
 949
 950 static int remove_cmd(int argc, const char **argv, const char *prefix)
 951 {
 952         struct option options[] = {
 953                 OPT_END()
 954         };
 955         const char *object_ref;
 956         struct notes_tree *t;
 957         unsigned char object[20];
 958
 959         argc = parse_options(argc, argv, prefix, options,
 960                              git_notes_remove_usage, 0);
 961
 962         if (1 < argc) {
 963                 error("too many parameters");
 964                 usage_with_options(git_notes_remove_usage, options);
 965         }
 966
 967         object_ref = argc ? argv[0] : "HEAD";
 968
 969         if (get_sha1(object_ref, object))
 970                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 971
 972         t = init_notes_check("remove");
 973
 974         fprintf(stderr, "Removing note for object %s\n", sha1_to_hex(object));
 975         remove_note(t, object);
 976
 977         commit_notes(t, "Notes removed by 'git notes remove'");
 978         free_notes(t);
 979         return 0;
 980 }
 981
 982 static int prune(int argc, const char **argv, const char *prefix)
 983 {
 984         struct notes_tree *t;
 985         int show_only = 0, verbose = 0;
 986         struct option options[] = {
 987                 OPT_BOOLEAN('n', "dry-run", &show_only,
 988                             "do not remove, show only"),
 989                 OPT_BOOLEAN('v', "verbose", &verbose, "report pruned notes"),
 990                 OPT_END()
 991         };
 992
 993         argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
 994                              0);
 995
 996         if (argc) {
 997                 error("too many parameters");
 998                 usage_with_options(git_notes_prune_usage, options);
 999         }
1000
1001         t = init_notes_check("prune");
1002
1003         prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
1004                 (show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
1005         if (!show_only)
1006                 commit_notes(t, "Notes removed by 'git notes prune'");
1007         free_notes(t);
1008         return 0;
1009 }
1010
1011 static int get_ref(int argc, const char **argv, const char *prefix)
1012 {
1013         struct option options[] = { OPT_END() };
1014         argc = parse_options(argc, argv, prefix, options,
1015                              git_notes_get_ref_usage, 0);
1016
1017         if (argc) {
1018                 error("too many parameters");
1019                 usage_with_options(git_notes_get_ref_usage, options);
1020         }
1021
1022         puts(default_notes_ref());
1023         return 0;
1024 }
1025
1026 int cmd_notes(int argc, const char **argv, const char *prefix)
1027 {
1028         int result;
1029         const char *override_notes_ref = NULL;
1030         struct option options[] = {
1031                 OPT_STRING(0, "ref", &override_notes_ref, "notes_ref",
1032                            "use notes from <notes_ref>"),
1033                 OPT_END()
1034         };
1035
1036         git_config(git_default_config, NULL);
1037         argc = parse_options(argc, argv, prefix, options, git_notes_usage,
1038                              PARSE_OPT_STOP_AT_NON_OPTION);
1039
1040         if (override_notes_ref) {
1041                 struct strbuf sb = STRBUF_INIT;
1042                 strbuf_addstr(&sb, override_notes_ref);
1043                 expand_notes_ref(&sb);
1044                 setenv("GIT_NOTES_REF", sb.buf, 1);
1045                 strbuf_release(&sb);
1046         }
1047
1048         if (argc < 1 || !strcmp(argv[0], "list"))
1049                 result = list(argc, argv, prefix);
1050         else if (!strcmp(argv[0], "add"))
1051                 result = add(argc, argv, prefix);
1052         else if (!strcmp(argv[0], "copy"))
1053                 result = copy(argc, argv, prefix);
1054         else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
1055                 result = append_edit(argc, argv, prefix);
1056         else if (!strcmp(argv[0], "show"))
1057                 result = show(argc, argv, prefix);
1058         else if (!strcmp(argv[0], "merge"))
1059                 result = merge(argc, argv, prefix);
1060         else if (!strcmp(argv[0], "remove"))
1061                 result = remove_cmd(argc, argv, prefix);
1062         else if (!strcmp(argv[0], "prune"))
1063                 result = prune(argc, argv, prefix);
1064         else if (!strcmp(argv[0], "get-ref"))
1065                 result = get_ref(argc, argv, prefix);
1066         else {
1067                 result = error("Unknown subcommand: %s", argv[0]);
1068                 usage_with_options(git_notes_usage, options);
1069         }
1070
1071         return result ? 1 : 0;
1072 }