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
  21 static const char * const git_notes_usage[] = {
  22         "git notes [--ref <notes_ref>] [list [<object>]]",
  23         "git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  24         "git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>",
  25         "git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  26         "git notes [--ref <notes_ref>] edit [<object>]",
  27         "git notes [--ref <notes_ref>] show [<object>]",
  28         "git notes [--ref <notes_ref>] remove [<object>]",
  29         "git notes [--ref <notes_ref>] prune [-n | -v]",
  30         NULL
  31 };
  32
  33 static const char * const git_notes_list_usage[] = {
  34         "git notes [list [<object>]]",
  35         NULL
  36 };
  37
  38 static const char * const git_notes_add_usage[] = {
  39         "git notes add [<options>] [<object>]",
  40         NULL
  41 };
  42
  43 static const char * const git_notes_copy_usage[] = {
  44         "git notes copy [<options>] <from-object> <to-object>",
  45         "git notes copy --stdin [<from-object> <to-object>]...",
  46         NULL
  47 };
  48
  49 static const char * const git_notes_append_usage[] = {
  50         "git notes append [<options>] [<object>]",
  51         NULL
  52 };
  53
  54 static const char * const git_notes_edit_usage[] = {
  55         "git notes edit [<object>]",
  56         NULL
  57 };
  58
  59 static const char * const git_notes_show_usage[] = {
  60         "git notes show [<object>]",
  61         NULL
  62 };
  63
  64 static const char * const git_notes_remove_usage[] = {
  65         "git notes remove [<object>]",
  66         NULL
  67 };
  68
  69 static const char * const git_notes_prune_usage[] = {
  70         "git notes prune [<options>]",
  71         NULL
  72 };
  73
  74 static const char note_template[] =
  75         "\n"
  76         "#\n"
  77         "# Write/edit the notes for the following object:\n"
  78         "#\n";
  79
  80 struct msg_arg {
  81         int given;
  82         int use_editor;
  83         struct strbuf buf;
  84 };
  85
  86 static int list_each_note(const unsigned char *object_sha1,
  87                 const unsigned char *note_sha1, char *note_path,
  88                 void *cb_data)
  89 {
  90         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
  91         return 0;
  92 }
  93
  94 static void write_note_data(int fd, const unsigned char *sha1)
  95 {
  96         unsigned long size;
  97         enum object_type type;
  98         char *buf = read_sha1_file(sha1, &type, &size);
  99         if (buf) {
 100                 if (size)
 101                         write_or_die(fd, buf, size);
 102                 free(buf);
 103         }
 104 }
 105
 106 static void write_commented_object(int fd, const unsigned char *object)
 107 {
 108         const char *show_args[5] =
 109                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
 110         struct child_process show;
 111         struct strbuf buf = STRBUF_INIT;
 112         FILE *show_out;
 113
 114         /* Invoke "git show --stat --no-notes $object" */
 115         memset(&show, 0, sizeof(show));
 116         show.argv = show_args;
 117         show.no_stdin = 1;
 118         show.out = -1;
 119         show.err = 0;
 120         show.git_cmd = 1;
 121         if (start_command(&show))
 122                 die("unable to start 'show' for object '%s'",
 123                     sha1_to_hex(object));
 124
 125         /* Open the output as FILE* so strbuf_getline() can be used. */
 126         show_out = xfdopen(show.out, "r");
 127         if (show_out == NULL)
 128                 die_errno("can't fdopen 'show' output fd");
 129
 130         /* Prepend "# " to each output line and write result to 'fd' */
 131         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
 132                 write_or_die(fd, "# ", 2);
 133                 write_or_die(fd, buf.buf, buf.len);
 134                 write_or_die(fd, "\n", 1);
 135         }
 136         strbuf_release(&buf);
 137         if (fclose(show_out))
 138                 die_errno("failed to close pipe to 'show' for object '%s'",
 139                           sha1_to_hex(object));
 140         if (finish_command(&show))
 141                 die("failed to finish 'show' for object '%s'",
 142                     sha1_to_hex(object));
 143 }
 144
 145 static void create_note(const unsigned char *object, struct msg_arg *msg,
 146                         int append_only, const unsigned char *prev,
 147                         unsigned char *result)
 148 {
 149         char *path = NULL;
 150
 151         if (msg->use_editor || !msg->given) {
 152                 int fd;
 153
 154                 /* write the template message before editing: */
 155                 path = git_pathdup("NOTES_EDITMSG");
 156                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 157                 if (fd < 0)
 158                         die_errno("could not create file '%s'", path);
 159
 160                 if (msg->given)
 161                         write_or_die(fd, msg->buf.buf, msg->buf.len);
 162                 else if (prev && !append_only)
 163                         write_note_data(fd, prev);
 164                 write_or_die(fd, note_template, strlen(note_template));
 165
 166                 write_commented_object(fd, object);
 167
 168                 close(fd);
 169                 strbuf_reset(&(msg->buf));
 170
 171                 if (launch_editor(path, &(msg->buf), NULL)) {
 172                         die("Please supply the note contents using either -m" \
 173                             " or -F option");
 174                 }
 175                 stripspace(&(msg->buf), 1);
 176         }
 177
 178         if (prev && append_only) {
 179                 /* Append buf to previous note contents */
 180                 unsigned long size;
 181                 enum object_type type;
 182                 char *prev_buf = read_sha1_file(prev, &type, &size);
 183
 184                 strbuf_grow(&(msg->buf), size + 1);
 185                 if (msg->buf.len && prev_buf && size)
 186                         strbuf_insert(&(msg->buf), 0, "\n", 1);
 187                 if (prev_buf && size)
 188                         strbuf_insert(&(msg->buf), 0, prev_buf, size);
 189                 free(prev_buf);
 190         }
 191
 192         if (!msg->buf.len) {
 193                 fprintf(stderr, "Removing note for object %s\n",
 194                         sha1_to_hex(object));
 195                 hashclr(result);
 196         } else {
 197                 if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
 198                         error("unable to write note object");
 199                         if (path)
 200                                 error("The note contents has been left in %s",
 201                                       path);
 202                         exit(128);
 203                 }
 204         }
 205
 206         if (path) {
 207                 unlink_or_warn(path);
 208                 free(path);
 209         }
 210 }
 211
 212 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 213 {
 214         struct msg_arg *msg = opt->value;
 215
 216         strbuf_grow(&(msg->buf), strlen(arg) + 2);
 217         if (msg->buf.len)
 218                 strbuf_addch(&(msg->buf), '\n');
 219         strbuf_addstr(&(msg->buf), arg);
 220         stripspace(&(msg->buf), 0);
 221
 222         msg->given = 1;
 223         return 0;
 224 }
 225
 226 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 227 {
 228         struct msg_arg *msg = opt->value;
 229
 230         if (msg->buf.len)
 231                 strbuf_addch(&(msg->buf), '\n');
 232         if (!strcmp(arg, "-")) {
 233                 if (strbuf_read(&(msg->buf), 0, 1024) < 0)
 234                         die_errno("cannot read '%s'", arg);
 235         } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
 236                 die_errno("could not open or read '%s'", arg);
 237         stripspace(&(msg->buf), 0);
 238
 239         msg->given = 1;
 240         return 0;
 241 }
 242
 243 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 244 {
 245         struct msg_arg *msg = opt->value;
 246         char *buf;
 247         unsigned char object[20];
 248         enum object_type type;
 249         unsigned long len;
 250
 251         if (msg->buf.len)
 252                 strbuf_addch(&(msg->buf), '\n');
 253
 254         if (get_sha1(arg, object))
 255                 die("Failed to resolve '%s' as a valid ref.", arg);
 256         if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
 257                 free(buf);
 258                 die("Failed to read object '%s'.", arg);;
 259         }
 260         strbuf_add(&(msg->buf), buf, len);
 261         free(buf);
 262
 263         msg->given = 1;
 264         return 0;
 265 }
 266
 267 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 268 {
 269         struct msg_arg *msg = opt->value;
 270         msg->use_editor = 1;
 271         return parse_reuse_arg(opt, arg, unset);
 272 }
 273
 274 int commit_notes(struct notes_tree *t, const char *msg)
 275 {
 276         struct commit_list *parent;
 277         unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
 278         struct strbuf buf = STRBUF_INIT;
 279
 280         if (!t)
 281                 t = &default_notes_tree;
 282         if (!t->initialized || !t->ref || !*t->ref)
 283                 die("Cannot commit uninitialized/unreferenced notes tree");
 284         if (!t->dirty)
 285                 return 0; /* don't have to commit an unchanged tree */
 286
 287         /* Prepare commit message and reflog message */
 288         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 289         strbuf_addstr(&buf, msg);
 290         if (buf.buf[buf.len - 1] != '\n')
 291                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 292
 293         /* Convert notes tree to tree object */
 294         if (write_notes_tree(t, tree_sha1))
 295                 die("Failed to write current notes tree to database");
 296
 297         /* Create new commit for the tree object */
 298         if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
 299                 parent = xmalloc(sizeof(*parent));
 300                 parent->item = lookup_commit(prev_commit);
 301                 parent->next = NULL;
 302         } else {
 303                 hashclr(prev_commit);
 304                 parent = NULL;
 305         }
 306         if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
 307                 die("Failed to commit notes tree to database");
 308
 309         /* Update notes ref with new commit */
 310         update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
 311
 312         strbuf_release(&buf);
 313         return 0;
 314 }
 315
 316 combine_notes_fn *parse_combine_notes_fn(const char *v)
 317 {
 318         if (!strcasecmp(v, "overwrite"))
 319                 return combine_notes_overwrite;
 320         else if (!strcasecmp(v, "ignore"))
 321                 return combine_notes_ignore;
 322         else if (!strcasecmp(v, "concatenate"))
 323                 return combine_notes_concatenate;
 324         else
 325                 return NULL;
 326 }
 327
 328 static int notes_rewrite_config(const char *k, const char *v, void *cb)
 329 {
 330         struct notes_rewrite_cfg *c = cb;
 331         if (!prefixcmp(k, "notes.rewrite.") && !strcmp(k+14, c->cmd)) {
 332                 c->enabled = git_config_bool(k, v);
 333                 return 0;
 334         } else if (!c->mode_from_env && !strcmp(k, "notes.rewritemode")) {
 335                 if (!v)
 336                         config_error_nonbool(k);
 337                 c->combine = parse_combine_notes_fn(v);
 338                 if (!c->combine) {
 339                         error("Bad notes.rewriteMode value: '%s'", v);
 340                         return 1;
 341                 }
 342                 return 0;
 343         } else if (!c->refs_from_env && !strcmp(k, "notes.rewriteref")) {
 344                 /* note that a refs/ prefix is implied in the
 345                  * underlying for_each_glob_ref */
 346                 if (!prefixcmp(v, "refs/notes/"))
 347                         string_list_add_refs_by_glob(c->refs, v);
 348                 else
 349                         warning("Refusing to rewrite notes in %s"
 350                                 " (outside of refs/notes/)", v);
 351                 return 0;
 352         }
 353
 354         return 0;
 355 }
 356
 357
 358 struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd)
 359 {
 360         struct notes_rewrite_cfg *c = xmalloc(sizeof(struct notes_rewrite_cfg));
 361         const char *rewrite_mode_env = getenv(GIT_NOTES_REWRITE_MODE_ENVIRONMENT);
 362         const char *rewrite_refs_env = getenv(GIT_NOTES_REWRITE_REF_ENVIRONMENT);
 363         c->cmd = cmd;
 364         c->enabled = 1;
 365         c->combine = combine_notes_concatenate;
 366         c->refs = xcalloc(1, sizeof(struct string_list));
 367         c->refs->strdup_strings = 1;
 368         c->refs_from_env = 0;
 369         c->mode_from_env = 0;
 370         if (rewrite_mode_env) {
 371                 c->mode_from_env = 1;
 372                 c->combine = parse_combine_notes_fn(rewrite_mode_env);
 373                 if (!c->combine)
 374                         error("Bad " GIT_NOTES_REWRITE_MODE_ENVIRONMENT
 375                               " value: '%s'", rewrite_mode_env);
 376         }
 377         if (rewrite_refs_env) {
 378                 c->refs_from_env = 1;
 379                 string_list_add_refs_from_colon_sep(c->refs, rewrite_refs_env);
 380         }
 381         git_config(notes_rewrite_config, c);
 382         if (!c->enabled || !c->refs->nr) {
 383                 string_list_clear(c->refs, 0);
 384                 free(c->refs);
 385                 free(c);
 386                 return NULL;
 387         }
 388         c->trees = load_notes_trees(c->refs);
 389         string_list_clear(c->refs, 0);
 390         free(c->refs);
 391         return c;
 392 }
 393
 394 int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
 395                           const unsigned char *from_obj, const unsigned char *to_obj)
 396 {
 397         int ret = 0;
 398         int i;
 399         for (i = 0; c->trees[i]; i++)
 400                 ret = copy_note(c->trees[i], from_obj, to_obj, 1, c->combine) || ret;
 401         return ret;
 402 }
 403
 404 void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c)
 405 {
 406         int i;
 407         for (i = 0; c->trees[i]; i++) {
 408                 commit_notes(c->trees[i], "Notes added by 'git notes copy'");
 409                 free_notes(c->trees[i]);
 410         }
 411         free(c->trees);
 412         free(c);
 413 }
 414
 415 int notes_copy_from_stdin(int force, const char *rewrite_cmd)
 416 {
 417         struct strbuf buf = STRBUF_INIT;
 418         struct notes_rewrite_cfg *c = NULL;
 419         struct notes_tree *t;
 420         int ret = 0;
 421
 422         if (rewrite_cmd) {
 423                 c = init_copy_notes_for_rewrite(rewrite_cmd);
 424                 if (!c)
 425                         return 0;
 426         } else {
 427                 init_notes(NULL, NULL, NULL, 0);
 428                 t = &default_notes_tree;
 429         }
 430
 431         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 432                 unsigned char from_obj[20], to_obj[20];
 433                 struct strbuf **split;
 434                 int err;
 435
 436                 split = strbuf_split(&buf, ' ');
 437                 if (!split[0] || !split[1])
 438                         die("Malformed input line: '%s'.", buf.buf);
 439                 strbuf_rtrim(split[0]);
 440                 strbuf_rtrim(split[1]);
 441                 if (get_sha1(split[0]->buf, from_obj))
 442                         die("Failed to resolve '%s' as a valid ref.", split[0]->buf);
 443                 if (get_sha1(split[1]->buf, to_obj))
 444                         die("Failed to resolve '%s' as a valid ref.", split[1]->buf);
 445
 446                 if (rewrite_cmd)
 447                         err = copy_note_for_rewrite(c, from_obj, to_obj);
 448                 else
 449                         err = copy_note(t, from_obj, to_obj, force,
 450                                         combine_notes_overwrite);
 451
 452                 if (err) {
 453                         error("Failed to copy notes from '%s' to '%s'",
 454                               split[0]->buf, split[1]->buf);
 455                         ret = 1;
 456                 }
 457
 458                 strbuf_list_free(split);
 459         }
 460
 461         if (!rewrite_cmd) {
 462                 commit_notes(t, "Notes added by 'git notes copy'");
 463                 free_notes(t);
 464         } else {
 465                 finish_copy_notes_for_rewrite(c);
 466         }
 467         return ret;
 468 }
 469
 470 static struct notes_tree *init_notes_check(const char *subcommand)
 471 {
 472         struct notes_tree *t;
 473         init_notes(NULL, NULL, NULL, 0);
 474         t = &default_notes_tree;
 475
 476         if (prefixcmp(t->ref, "refs/notes/"))
 477                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 478                     subcommand, t->ref);
 479         return t;
 480 }
 481
 482 static int list(int argc, const char **argv, const char *prefix)
 483 {
 484         struct notes_tree *t;
 485         unsigned char object[20];
 486         const unsigned char *note;
 487         int retval = -1;
 488         struct option options[] = {
 489                 OPT_END()
 490         };
 491
 492         if (argc)
 493                 argc = parse_options(argc, argv, prefix, options,
 494                                      git_notes_list_usage, 0);
 495
 496         if (1 < argc) {
 497                 error("too many parameters");
 498                 usage_with_options(git_notes_list_usage, options);
 499         }
 500
 501         t = init_notes_check("list");
 502         if (argc) {
 503                 if (get_sha1(argv[0], object))
 504                         die("Failed to resolve '%s' as a valid ref.", argv[0]);
 505                 note = get_note(t, object);
 506                 if (note) {
 507                         puts(sha1_to_hex(note));
 508                         retval = 0;
 509                 } else
 510                         retval = error("No note found for object %s.",
 511                                        sha1_to_hex(object));
 512         } else
 513                 retval = for_each_note(t, 0, list_each_note, NULL);
 514
 515         free_notes(t);
 516         return retval;
 517 }
 518
 519 static int add(int argc, const char **argv, const char *prefix)
 520 {
 521         int retval = 0, force = 0;
 522         const char *object_ref;
 523         struct notes_tree *t;
 524         unsigned char object[20], new_note[20];
 525         char logmsg[100];
 526         const unsigned char *note;
 527         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 528         struct option options[] = {
 529                 { OPTION_CALLBACK, 'm', "message", &msg, "MSG",
 530                         "note contents as a string", PARSE_OPT_NONEG,
 531                         parse_msg_arg},
 532                 { OPTION_CALLBACK, 'F', "file", &msg, "FILE",
 533                         "note contents in a file", PARSE_OPT_NONEG,
 534                         parse_file_arg},
 535                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
 536                         "reuse and edit specified note object", PARSE_OPT_NONEG,
 537                         parse_reedit_arg},
 538                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
 539                         "reuse specified note object", PARSE_OPT_NONEG,
 540                         parse_reuse_arg},
 541                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 542                 OPT_END()
 543         };
 544
 545         argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
 546                              0);
 547
 548         if (1 < argc) {
 549                 error("too many parameters");
 550                 usage_with_options(git_notes_add_usage, options);
 551         }
 552
 553         object_ref = argc ? argv[0] : "HEAD";
 554
 555         if (get_sha1(object_ref, object))
 556                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 557
 558         t = init_notes_check("add");
 559         note = get_note(t, object);
 560
 561         if (note) {
 562                 if (!force) {
 563                         retval = error("Cannot add notes. Found existing notes "
 564                                        "for object %s. Use '-f' to overwrite "
 565                                        "existing notes", sha1_to_hex(object));
 566                         goto out;
 567                 }
 568                 fprintf(stderr, "Overwriting existing notes for object %s\n",
 569                         sha1_to_hex(object));
 570         }
 571
 572         create_note(object, &msg, 0, note, new_note);
 573
 574         if (is_null_sha1(new_note))
 575                 remove_note(t, object);
 576         else
 577                 add_note(t, object, new_note, combine_notes_overwrite);
 578
 579         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 580                  is_null_sha1(new_note) ? "removed" : "added", "add");
 581         commit_notes(t, logmsg);
 582 out:
 583         free_notes(t);
 584         strbuf_release(&(msg.buf));
 585         return retval;
 586 }
 587
 588 static int copy(int argc, const char **argv, const char *prefix)
 589 {
 590         int retval = 0, force = 0, from_stdin = 0;
 591         const unsigned char *from_note, *note;
 592         const char *object_ref;
 593         unsigned char object[20], from_obj[20];
 594         struct notes_tree *t;
 595         const char *rewrite_cmd = NULL;
 596         struct option options[] = {
 597                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 598                 OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
 599                 OPT_STRING(0, "for-rewrite", &rewrite_cmd, "command",
 600                            "load rewriting config for <command> (implies "
 601                            "--stdin)"),
 602                 OPT_END()
 603         };
 604
 605         argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
 606                              0);
 607
 608         if (from_stdin || rewrite_cmd) {
 609                 if (argc) {
 610                         error("too many parameters");
 611                         usage_with_options(git_notes_copy_usage, options);
 612                 } else {
 613                         return notes_copy_from_stdin(force, rewrite_cmd);
 614                 }
 615         }
 616
 617         if (2 < argc) {
 618                 error("too many parameters");
 619                 usage_with_options(git_notes_copy_usage, options);
 620         }
 621
 622         if (get_sha1(argv[0], from_obj))
 623                 die("Failed to resolve '%s' as a valid ref.", argv[0]);
 624
 625         object_ref = 1 < argc ? argv[1] : "HEAD";
 626
 627         if (get_sha1(object_ref, object))
 628                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 629
 630         t = init_notes_check("copy");
 631         note = get_note(t, object);
 632
 633         if (note) {
 634                 if (!force) {
 635                         retval = error("Cannot copy notes. Found existing "
 636                                        "notes for object %s. Use '-f' to "
 637                                        "overwrite existing notes",
 638                                        sha1_to_hex(object));
 639                         goto out;
 640                 }
 641                 fprintf(stderr, "Overwriting existing notes for object %s\n",
 642                         sha1_to_hex(object));
 643         }
 644
 645         from_note = get_note(t, from_obj);
 646         if (!from_note) {
 647                 retval = error("Missing notes on source object %s. Cannot "
 648                                "copy.", sha1_to_hex(from_obj));
 649                 goto out;
 650         }
 651
 652         add_note(t, object, from_note, combine_notes_overwrite);
 653         commit_notes(t, "Notes added by 'git notes copy'");
 654 out:
 655         free_notes(t);
 656         return retval;
 657 }
 658
 659 static int append_edit(int argc, const char **argv, const char *prefix)
 660 {
 661         const char *object_ref;
 662         struct notes_tree *t;
 663         unsigned char object[20], new_note[20];
 664         const unsigned char *note;
 665         char logmsg[100];
 666         const char * const *usage;
 667         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 668         struct option options[] = {
 669                 { OPTION_CALLBACK, 'm', "message", &msg, "MSG",
 670                         "note contents as a string", PARSE_OPT_NONEG,
 671                         parse_msg_arg},
 672                 { OPTION_CALLBACK, 'F', "file", &msg, "FILE",
 673                         "note contents in a file", PARSE_OPT_NONEG,
 674                         parse_file_arg},
 675                 { OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
 676                         "reuse and edit specified note object", PARSE_OPT_NONEG,
 677                         parse_reedit_arg},
 678                 { OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
 679                         "reuse specified note object", PARSE_OPT_NONEG,
 680                         parse_reuse_arg},
 681                 OPT_END()
 682         };
 683         int edit = !strcmp(argv[0], "edit");
 684
 685         usage = edit ? git_notes_edit_usage : git_notes_append_usage;
 686         argc = parse_options(argc, argv, prefix, options, usage,
 687                              PARSE_OPT_KEEP_ARGV0);
 688
 689         if (2 < argc) {
 690                 error("too many parameters");
 691                 usage_with_options(usage, options);
 692         }
 693
 694         if (msg.given && edit)
 695                 fprintf(stderr, "The -m/-F/-c/-C options have been deprecated "
 696                         "for the 'edit' subcommand.\n"
 697                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n");
 698
 699         object_ref = 1 < argc ? argv[1] : "HEAD";
 700
 701         if (get_sha1(object_ref, object))
 702                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 703
 704         t = init_notes_check(argv[0]);
 705         note = get_note(t, object);
 706
 707         create_note(object, &msg, !edit, note, new_note);
 708
 709         if (is_null_sha1(new_note))
 710                 remove_note(t, object);
 711         else
 712                 add_note(t, object, new_note, combine_notes_overwrite);
 713
 714         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 715                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 716         commit_notes(t, logmsg);
 717         free_notes(t);
 718         strbuf_release(&(msg.buf));
 719         return 0;
 720 }
 721
 722 static int show(int argc, const char **argv, const char *prefix)
 723 {
 724         const char *object_ref;
 725         struct notes_tree *t;
 726         unsigned char object[20];
 727         const unsigned char *note;
 728         int retval;
 729         struct option options[] = {
 730                 OPT_END()
 731         };
 732
 733         argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
 734                              0);
 735
 736         if (1 < argc) {
 737                 error("too many parameters");
 738                 usage_with_options(git_notes_show_usage, options);
 739         }
 740
 741         object_ref = argc ? argv[0] : "HEAD";
 742
 743         if (get_sha1(object_ref, object))
 744                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 745
 746         t = init_notes_check("show");
 747         note = get_note(t, object);
 748
 749         if (!note)
 750                 retval = error("No note found for object %s.",
 751                                sha1_to_hex(object));
 752         else {
 753                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 754                 retval = execv_git_cmd(show_args);
 755         }
 756         free_notes(t);
 757         return retval;
 758 }
 759
 760 static int remove_cmd(int argc, const char **argv, const char *prefix)
 761 {
 762         struct option options[] = {
 763                 OPT_END()
 764         };
 765         const char *object_ref;
 766         struct notes_tree *t;
 767         unsigned char object[20];
 768
 769         argc = parse_options(argc, argv, prefix, options,
 770                              git_notes_remove_usage, 0);
 771
 772         if (1 < argc) {
 773                 error("too many parameters");
 774                 usage_with_options(git_notes_remove_usage, options);
 775         }
 776
 777         object_ref = argc ? argv[0] : "HEAD";
 778
 779         if (get_sha1(object_ref, object))
 780                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 781
 782         t = init_notes_check("remove");
 783
 784         fprintf(stderr, "Removing note for object %s\n", sha1_to_hex(object));
 785         remove_note(t, object);
 786
 787         commit_notes(t, "Notes removed by 'git notes remove'");
 788         free_notes(t);
 789         return 0;
 790 }
 791
 792 static int prune(int argc, const char **argv, const char *prefix)
 793 {
 794         struct notes_tree *t;
 795         int show_only = 0, verbose = 0;
 796         struct option options[] = {
 797                 OPT_BOOLEAN('n', NULL, &show_only, "do not remove, show only"),
 798                 OPT_BOOLEAN('v', NULL, &verbose, "report pruned notes"),
 799                 OPT_END()
 800         };
 801
 802         argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
 803                              0);
 804
 805         if (argc) {
 806                 error("too many parameters");
 807                 usage_with_options(git_notes_prune_usage, options);
 808         }
 809
 810         t = init_notes_check("prune");
 811
 812         prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
 813                 (show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
 814         if (!show_only)
 815                 commit_notes(t, "Notes removed by 'git notes prune'");
 816         free_notes(t);
 817         return 0;
 818 }
 819
 820 int cmd_notes(int argc, const char **argv, const char *prefix)
 821 {
 822         int result;
 823         const char *override_notes_ref = NULL;
 824         struct option options[] = {
 825                 OPT_STRING(0, "ref", &override_notes_ref, "notes_ref",
 826                            "use notes from <notes_ref>"),
 827                 OPT_END()
 828         };
 829
 830         git_config(git_default_config, NULL);
 831         argc = parse_options(argc, argv, prefix, options, git_notes_usage,
 832                              PARSE_OPT_STOP_AT_NON_OPTION);
 833
 834         if (override_notes_ref) {
 835                 struct strbuf sb = STRBUF_INIT;
 836                 if (!prefixcmp(override_notes_ref, "refs/notes/"))
 837                         /* we're happy */;
 838                 else if (!prefixcmp(override_notes_ref, "notes/"))
 839                         strbuf_addstr(&sb, "refs/");
 840                 else
 841                         strbuf_addstr(&sb, "refs/notes/");
 842                 strbuf_addstr(&sb, override_notes_ref);
 843                 setenv("GIT_NOTES_REF", sb.buf, 1);
 844                 strbuf_release(&sb);
 845         }
 846
 847         if (argc < 1 || !strcmp(argv[0], "list"))
 848                 result = list(argc, argv, prefix);
 849         else if (!strcmp(argv[0], "add"))
 850                 result = add(argc, argv, prefix);
 851         else if (!strcmp(argv[0], "copy"))
 852                 result = copy(argc, argv, prefix);
 853         else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
 854                 result = append_edit(argc, argv, prefix);
 855         else if (!strcmp(argv[0], "show"))
 856                 result = show(argc, argv, prefix);
 857         else if (!strcmp(argv[0], "remove"))
 858                 result = remove_cmd(argc, argv, prefix);
 859         else if (!strcmp(argv[0], "prune"))
 860                 result = prune(argc, argv, prefix);
 861         else {
 862                 result = error("Unknown subcommand: %s", argv[0]);
 863                 usage_with_options(git_notes_usage, options);
 864         }
 865
 866         return result ? 1 : 0;
 867 }