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
  20 static const char * const git_notes_usage[] = {
  21         "git notes [list [<object>]]",
  22         "git notes add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  23         "git notes copy [-f] <from-object> <to-object>",
  24         "git notes append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
  25         "git notes edit [<object>]",
  26         "git notes show [<object>]",
  27         "git notes remove [<object>]",
  28         "git notes prune",
  29         NULL
  30 };
  31
  32 static const char note_template[] =
  33         "\n"
  34         "#\n"
  35         "# Write/edit the notes for the following object:\n"
  36         "#\n";
  37
  38 struct msg_arg {
  39         int given;
  40         int use_editor;
  41         struct strbuf buf;
  42 };
  43
  44 static int list_each_note(const unsigned char *object_sha1,
  45                 const unsigned char *note_sha1, char *note_path,
  46                 void *cb_data)
  47 {
  48         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
  49         return 0;
  50 }
  51
  52 static void write_note_data(int fd, const unsigned char *sha1)
  53 {
  54         unsigned long size;
  55         enum object_type type;
  56         char *buf = read_sha1_file(sha1, &type, &size);
  57         if (buf) {
  58                 if (size)
  59                         write_or_die(fd, buf, size);
  60                 free(buf);
  61         }
  62 }
  63
  64 static void write_commented_object(int fd, const unsigned char *object)
  65 {
  66         const char *show_args[5] =
  67                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
  68         struct child_process show;
  69         struct strbuf buf = STRBUF_INIT;
  70         FILE *show_out;
  71
  72         /* Invoke "git show --stat --no-notes $object" */
  73         memset(&show, 0, sizeof(show));
  74         show.argv = show_args;
  75         show.no_stdin = 1;
  76         show.out = -1;
  77         show.err = 0;
  78         show.git_cmd = 1;
  79         if (start_command(&show))
  80                 die("unable to start 'show' for object '%s'",
  81                     sha1_to_hex(object));
  82
  83         /* Open the output as FILE* so strbuf_getline() can be used. */
  84         show_out = xfdopen(show.out, "r");
  85         if (show_out == NULL)
  86                 die_errno("can't fdopen 'show' output fd");
  87
  88         /* Prepend "# " to each output line and write result to 'fd' */
  89         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
  90                 write_or_die(fd, "# ", 2);
  91                 write_or_die(fd, buf.buf, buf.len);
  92                 write_or_die(fd, "\n", 1);
  93         }
  94         strbuf_release(&buf);
  95         if (fclose(show_out))
  96                 die_errno("failed to close pipe to 'show' for object '%s'",
  97                           sha1_to_hex(object));
  98         if (finish_command(&show))
  99                 die("failed to finish 'show' for object '%s'",
 100                     sha1_to_hex(object));
 101 }
 102
 103 static void create_note(const unsigned char *object, struct msg_arg *msg,
 104                         int append_only, const unsigned char *prev,
 105                         unsigned char *result)
 106 {
 107         char *path = NULL;
 108
 109         if (msg->use_editor || !msg->given) {
 110                 int fd;
 111
 112                 /* write the template message before editing: */
 113                 path = git_pathdup("NOTES_EDITMSG");
 114                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 115                 if (fd < 0)
 116                         die_errno("could not create file '%s'", path);
 117
 118                 if (msg->given)
 119                         write_or_die(fd, msg->buf.buf, msg->buf.len);
 120                 else if (prev && !append_only)
 121                         write_note_data(fd, prev);
 122                 write_or_die(fd, note_template, strlen(note_template));
 123
 124                 write_commented_object(fd, object);
 125
 126                 close(fd);
 127                 strbuf_reset(&(msg->buf));
 128
 129                 if (launch_editor(path, &(msg->buf), NULL)) {
 130                         die("Please supply the note contents using either -m" \
 131                             " or -F option");
 132                 }
 133                 stripspace(&(msg->buf), 1);
 134         }
 135
 136         if (prev && append_only) {
 137                 /* Append buf to previous note contents */
 138                 unsigned long size;
 139                 enum object_type type;
 140                 char *prev_buf = read_sha1_file(prev, &type, &size);
 141
 142                 strbuf_grow(&(msg->buf), size + 1);
 143                 if (msg->buf.len && prev_buf && size)
 144                         strbuf_insert(&(msg->buf), 0, "\n", 1);
 145                 if (prev_buf && size)
 146                         strbuf_insert(&(msg->buf), 0, prev_buf, size);
 147                 free(prev_buf);
 148         }
 149
 150         if (!msg->buf.len) {
 151                 fprintf(stderr, "Removing note for object %s\n",
 152                         sha1_to_hex(object));
 153                 hashclr(result);
 154         } else {
 155                 if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
 156                         error("unable to write note object");
 157                         if (path)
 158                                 error("The note contents has been left in %s",
 159                                       path);
 160                         exit(128);
 161                 }
 162         }
 163
 164         if (path) {
 165                 unlink_or_warn(path);
 166                 free(path);
 167         }
 168 }
 169
 170 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 171 {
 172         struct msg_arg *msg = opt->value;
 173
 174         if (!arg)
 175                 return -1;
 176
 177         strbuf_grow(&(msg->buf), strlen(arg) + 2);
 178         if (msg->buf.len)
 179                 strbuf_addstr(&(msg->buf), "\n");
 180         strbuf_addstr(&(msg->buf), arg);
 181         stripspace(&(msg->buf), 0);
 182
 183         msg->given = 1;
 184         return 0;
 185 }
 186
 187 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 188 {
 189         struct msg_arg *msg = opt->value;
 190
 191         if (!arg)
 192                 return -1;
 193
 194         if (msg->buf.len)
 195                 strbuf_addstr(&(msg->buf), "\n");
 196         if (!strcmp(arg, "-")) {
 197                 if (strbuf_read(&(msg->buf), 0, 1024) < 0)
 198                         die_errno("cannot read '%s'", arg);
 199         } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
 200                 die_errno("could not open or read '%s'", arg);
 201         stripspace(&(msg->buf), 0);
 202
 203         msg->given = 1;
 204         return 0;
 205 }
 206
 207 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 208 {
 209         struct msg_arg *msg = opt->value;
 210         char *buf;
 211         unsigned char object[20];
 212         enum object_type type;
 213         unsigned long len;
 214
 215         if (!arg)
 216                 return -1;
 217
 218         if (msg->buf.len)
 219                 strbuf_addstr(&(msg->buf), "\n");
 220
 221         if (get_sha1(arg, object))
 222                 die("Failed to resolve '%s' as a valid ref.", arg);
 223         if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
 224                 free(buf);
 225                 die("Failed to read object '%s'.", arg);;
 226         }
 227         strbuf_add(&(msg->buf), buf, len);
 228         free(buf);
 229
 230         msg->given = 1;
 231         return 0;
 232 }
 233
 234 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 235 {
 236         struct msg_arg *msg = opt->value;
 237         msg->use_editor = 1;
 238         return parse_reuse_arg(opt, arg, unset);
 239 }
 240
 241 int commit_notes(struct notes_tree *t, const char *msg)
 242 {
 243         struct commit_list *parent;
 244         unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
 245         struct strbuf buf = STRBUF_INIT;
 246
 247         if (!t)
 248                 t = &default_notes_tree;
 249         if (!t->initialized || !t->ref || !*t->ref)
 250                 die("Cannot commit uninitialized/unreferenced notes tree");
 251
 252         /* Prepare commit message and reflog message */
 253         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 254         strbuf_addstr(&buf, msg);
 255         if (buf.buf[buf.len - 1] != '\n')
 256                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 257
 258         /* Convert notes tree to tree object */
 259         if (write_notes_tree(t, tree_sha1))
 260                 die("Failed to write current notes tree to database");
 261
 262         /* Create new commit for the tree object */
 263         if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
 264                 parent = xmalloc(sizeof(*parent));
 265                 parent->item = lookup_commit(prev_commit);
 266                 parent->next = NULL;
 267         } else {
 268                 hashclr(prev_commit);
 269                 parent = NULL;
 270         }
 271         if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
 272                 die("Failed to commit notes tree to database");
 273
 274         /* Update notes ref with new commit */
 275         update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
 276
 277         strbuf_release(&buf);
 278         return 0;
 279 }
 280
 281 int notes_copy_from_stdin(int force)
 282 {
 283         struct strbuf buf = STRBUF_INIT;
 284         struct notes_tree *t;
 285         int ret = 0;
 286
 287         init_notes(NULL, NULL, NULL, 0);
 288         t = &default_notes_tree;
 289
 290         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 291                 unsigned char from_obj[20], to_obj[20];
 292                 struct strbuf **split;
 293                 int err;
 294
 295                 split = strbuf_split(&buf, ' ');
 296                 if (!split[0] || !split[1])
 297                         die("Malformed input line: '%s'.", buf.buf);
 298                 strbuf_rtrim(split[0]);
 299                 strbuf_rtrim(split[1]);
 300                 if (get_sha1(split[0]->buf, from_obj))
 301                         die("Failed to resolve '%s' as a valid ref.", split[0]->buf);
 302                 if (get_sha1(split[1]->buf, to_obj))
 303                         die("Failed to resolve '%s' as a valid ref.", split[1]->buf);
 304
 305                 err = copy_note(t, from_obj, to_obj, force, combine_notes_overwrite);
 306
 307                 if (err) {
 308                         error("Failed to copy notes from '%s' to '%s'",
 309                               split[0]->buf, split[1]->buf);
 310                         ret = 1;
 311                 }
 312
 313                 strbuf_list_free(split);
 314         }
 315
 316         commit_notes(t, "Notes added by 'git notes copy'");
 317         free_notes(t);
 318         return ret;
 319 }
 320
 321 int cmd_notes(int argc, const char **argv, const char *prefix)
 322 {
 323         struct notes_tree *t;
 324         unsigned char object[20], from_obj[20], new_note[20];
 325         const unsigned char *note;
 326         const char *object_ref;
 327         char logmsg[100];
 328
 329         int list = 0, add = 0, copy = 0, append = 0, edit = 0, show = 0,
 330             remove = 0, prune = 0, force = 0, from_stdin = 0;
 331         int given_object = 0, i = 1, retval = 0;
 332         struct msg_arg msg = { 0, 0, STRBUF_INIT };
 333         struct option options[] = {
 334                 OPT_GROUP("Notes options"),
 335                 OPT_CALLBACK('m', "message", &msg, "MSG",
 336                              "note contents as a string", parse_msg_arg),
 337                 OPT_CALLBACK('F', "file", &msg, "FILE",
 338                              "note contents in a file", parse_file_arg),
 339                 OPT_CALLBACK('c', "reedit-message", &msg, "OBJECT",
 340                            "reuse and edit specified note object", parse_reedit_arg),
 341                 OPT_CALLBACK('C', "reuse-message", &msg, "OBJECT",
 342                            "reuse specified note object", parse_reuse_arg),
 343                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 344                 OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
 345                 OPT_END()
 346         };
 347
 348         git_config(git_default_config, NULL);
 349
 350         argc = parse_options(argc, argv, prefix, options, git_notes_usage, 0);
 351
 352         if (argc && !strcmp(argv[0], "list"))
 353                 list = 1;
 354         else if (argc && !strcmp(argv[0], "add"))
 355                 add = 1;
 356         else if (argc && !strcmp(argv[0], "copy"))
 357                 copy = 1;
 358         else if (argc && !strcmp(argv[0], "append"))
 359                 append = 1;
 360         else if (argc && !strcmp(argv[0], "edit"))
 361                 edit = 1;
 362         else if (argc && !strcmp(argv[0], "show"))
 363                 show = 1;
 364         else if (argc && !strcmp(argv[0], "remove"))
 365                 remove = 1;
 366         else if (argc && !strcmp(argv[0], "prune"))
 367                 prune = 1;
 368         else if (!argc) {
 369                 list = 1; /* Default to 'list' if no other subcommand given */
 370                 i = 0;
 371         }
 372
 373         if (list + add + copy + append + edit + show + remove + prune != 1)
 374                 usage_with_options(git_notes_usage, options);
 375
 376         if (msg.given && !(add || append || edit)) {
 377                 error("cannot use -m/-F/-c/-C options with %s subcommand.",
 378                       argv[0]);
 379                 usage_with_options(git_notes_usage, options);
 380         }
 381
 382         if (msg.given && edit) {
 383                 fprintf(stderr, "The -m/-F/-c/-C options have been deprecated "
 384                         "for the 'edit' subcommand.\n"
 385                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n");
 386         }
 387
 388         if (force && !(add || copy)) {
 389                 error("cannot use -f option with %s subcommand.", argv[0]);
 390                 usage_with_options(git_notes_usage, options);
 391         }
 392
 393         if (!copy && from_stdin) {
 394                 error("cannot use --stdin with %s subcommand.", argv[0]);
 395                 usage_with_options(git_notes_usage, options);
 396         }
 397
 398         if (copy) {
 399                 const char *from_ref;
 400                 if (from_stdin) {
 401                         if (argc > 1) {
 402                                 error("too many parameters");
 403                                 usage_with_options(git_notes_usage, options);
 404                         } else {
 405                                 return notes_copy_from_stdin(force);
 406                         }
 407                 }
 408                 if (argc < 3) {
 409                         error("too few parameters");
 410                         usage_with_options(git_notes_usage, options);
 411                 }
 412                 from_ref = argv[i++];
 413                 if (get_sha1(from_ref, from_obj))
 414                         die("Failed to resolve '%s' as a valid ref.", from_ref);
 415         }
 416
 417         given_object = argc > i;
 418         object_ref = given_object ? argv[i++] : "HEAD";
 419
 420         if (argc > i || (prune && given_object)) {
 421                 error("too many parameters");
 422                 usage_with_options(git_notes_usage, options);
 423         }
 424
 425         if (get_sha1(object_ref, object))
 426                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 427
 428         init_notes(NULL, NULL, NULL, 0);
 429         t = &default_notes_tree;
 430
 431         if (prefixcmp(t->ref, "refs/notes/"))
 432                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 433                     argv[0], t->ref);
 434
 435         note = get_note(t, object);
 436
 437         /* list command */
 438
 439         if (list) {
 440                 if (given_object) {
 441                         if (note) {
 442                                 puts(sha1_to_hex(note));
 443                                 goto end;
 444                         }
 445                 } else {
 446                         retval = for_each_note(t, 0, list_each_note, NULL);
 447                         goto end;
 448                 }
 449         }
 450
 451         /* show command */
 452
 453         if ((list || show) && !note) {
 454                 error("No note found for object %s.", sha1_to_hex(object));
 455                 retval = 1;
 456                 goto end;
 457         } else if (show) {
 458                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 459                 retval = execv_git_cmd(show_args);
 460                 goto end;
 461         }
 462
 463         /* add/append/edit/remove/prune command */
 464
 465         if ((add || copy) && note) {
 466                 if (!force) {
 467                         error("Cannot %s notes. Found existing notes for object"
 468                               " %s. Use '-f' to overwrite existing notes",
 469                               argv[0], sha1_to_hex(object));
 470                         retval = 1;
 471                         goto end;
 472                 }
 473                 fprintf(stderr, "Overwriting existing notes for object %s\n",
 474                         sha1_to_hex(object));
 475         }
 476
 477         if (remove) {
 478                 msg.given = 1;
 479                 msg.use_editor = 0;
 480                 strbuf_reset(&(msg.buf));
 481         }
 482
 483         if (prune) {
 484                 hashclr(new_note);
 485                 prune_notes(t);
 486                 goto commit;
 487         } else if (copy) {
 488                 const unsigned char *from_note = get_note(t, from_obj);
 489                 if (!from_note) {
 490                         error("Missing notes on source object %s. Cannot copy.",
 491                               sha1_to_hex(from_obj));
 492                         retval = 1;
 493                         goto end;
 494                 }
 495                 hashcpy(new_note, from_note);
 496         } else
 497                 create_note(object, &msg, append, note, new_note);
 498
 499         if (is_null_sha1(new_note))
 500                 remove_note(t, object);
 501         else
 502                 add_note(t, object, new_note, combine_notes_overwrite);
 503
 504 commit:
 505         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
 506                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 507         commit_notes(t, logmsg);
 508
 509 end:
 510         free_notes(t);
 511         strbuf_release(&(msg.buf));
 512         return retval;
 513 }