builtin-log.c

   1 /*
   2  * Builtin "git log" and related commands (show, whatchanged)
   3  *
   4  * (C) Copyright 2006 Linus Torvalds
   5  *               2006 Junio Hamano
   6  */
   7 #include "cache.h"
   8 #include "commit.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "log-tree.h"
  12 #include "builtin.h"
  13 #include "tag.h"
  14 #include "reflog-walk.h"
  15 #include "patch-ids.h"
  16 #include "refs.h"
  17
  18 static int default_show_root = 1;
  19 static const char *fmt_patch_subject_prefix = "PATCH";
  20
  21 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  22 {
  23         int plen = strlen(prefix);
  24         int nlen = strlen(name);
  25         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  26         memcpy(res->name, prefix, plen);
  27         memcpy(res->name + plen, name, nlen + 1);
  28         res->next = add_decoration(&name_decoration, obj, res);
  29 }
  30
  31 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  32 {
  33         struct object *obj = parse_object(sha1);
  34         if (!obj)
  35                 return 0;
  36         add_name_decoration("", refname, obj);
  37         while (obj->type == OBJ_TAG) {
  38                 obj = ((struct tag *)obj)->tagged;
  39                 if (!obj)
  40                         break;
  41                 add_name_decoration("tag: ", refname, obj);
  42         }
  43         return 0;
  44 }
  45
  46 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  47                       struct rev_info *rev)
  48 {
  49         int i;
  50         int decorate = 0;
  51
  52         rev->abbrev = DEFAULT_ABBREV;
  53         rev->commit_format = CMIT_FMT_DEFAULT;
  54         rev->verbose_header = 1;
  55         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  56         rev->show_root_diff = default_show_root;
  57         rev->subject_prefix = fmt_patch_subject_prefix;
  58         argc = setup_revisions(argc, argv, rev, "HEAD");
  59         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  60                 rev->always_show_header = 0;
  61         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  62                 rev->always_show_header = 0;
  63                 if (rev->diffopt.nr_paths != 1)
  64                         usage("git logs can only follow renames on one pathname at a time");
  65         }
  66         for (i = 1; i < argc; i++) {
  67                 const char *arg = argv[i];
  68                 if (!strcmp(arg, "--decorate")) {
  69                         if (!decorate)
  70                                 for_each_ref(add_ref_decoration, NULL);
  71                         decorate = 1;
  72                 } else
  73                         die("unrecognized argument: %s", arg);
  74         }
  75 }
  76
  77 /*
  78  * This gives a rough estimate for how many commits we
  79  * will print out in the list.
  80  */
  81 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  82 {
  83         int n = 0;
  84
  85         while (list) {
  86                 struct commit *commit = list->item;
  87                 unsigned int flags = commit->object.flags;
  88                 list = list->next;
  89                 if (!(flags & (TREESAME | UNINTERESTING)))
  90                         n++;
  91         }
  92         return n;
  93 }
  94
  95 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  96 {
  97         if (rev->shown_one) {
  98                 rev->shown_one = 0;
  99                 if (rev->commit_format != CMIT_FMT_ONELINE)
 100                         putchar(rev->diffopt.line_termination);
 101         }
 102         printf("Final output: %d %s\n", nr, stage);
 103 }
 104
 105 struct itimerval early_output_timer;
 106
 107 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 108 {
 109         int i = revs->early_output;
 110         int show_header = 1;
 111
 112         sort_in_topological_order(&list, revs->lifo);
 113         while (list && i) {
 114                 struct commit *commit = list->item;
 115                 switch (simplify_commit(revs, commit)) {
 116                 case commit_show:
 117                         if (show_header) {
 118                                 int n = estimate_commit_count(revs, list);
 119                                 show_early_header(revs, "incomplete", n);
 120                                 show_header = 0;
 121                         }
 122                         log_tree_commit(revs, commit);
 123                         i--;
 124                         break;
 125                 case commit_ignore:
 126                         break;
 127                 case commit_error:
 128                         return;
 129                 }
 130                 list = list->next;
 131         }
 132
 133         /* Did we already get enough commits for the early output? */
 134         if (!i)
 135                 return;
 136
 137         /*
 138          * ..if no, then repeat it twice a second until we
 139          * do.
 140          *
 141          * NOTE! We don't use "it_interval", because if the
 142          * reader isn't listening, we want our output to be
 143          * throttled by the writing, and not have the timer
 144          * trigger every second even if we're blocked on a
 145          * reader!
 146          */
 147         early_output_timer.it_value.tv_sec = 0;
 148         early_output_timer.it_value.tv_usec = 500000;
 149         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 150 }
 151
 152 static void early_output(int signal)
 153 {
 154         show_early_output = log_show_early;
 155 }
 156
 157 static void setup_early_output(struct rev_info *rev)
 158 {
 159         struct sigaction sa;
 160
 161         /*
 162          * Set up the signal handler, minimally intrusively:
 163          * we only set a single volatile integer word (not
 164          * using sigatomic_t - trying to avoid unnecessary
 165          * system dependencies and headers), and using
 166          * SA_RESTART.
 167          */
 168         memset(&sa, 0, sizeof(sa));
 169         sa.sa_handler = early_output;
 170         sigemptyset(&sa.sa_mask);
 171         sa.sa_flags = SA_RESTART;
 172         sigaction(SIGALRM, &sa, NULL);
 173
 174         /*
 175          * If we can get the whole output in less than a
 176          * tenth of a second, don't even bother doing the
 177          * early-output thing..
 178          *
 179          * This is a one-time-only trigger.
 180          */
 181         early_output_timer.it_value.tv_sec = 0;
 182         early_output_timer.it_value.tv_usec = 100000;
 183         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 184 }
 185
 186 static void finish_early_output(struct rev_info *rev)
 187 {
 188         int n = estimate_commit_count(rev, rev->commits);
 189         signal(SIGALRM, SIG_IGN);
 190         show_early_header(rev, "done", n);
 191 }
 192
 193 static int cmd_log_walk(struct rev_info *rev)
 194 {
 195         struct commit *commit;
 196
 197         if (rev->early_output)
 198                 setup_early_output(rev);
 199
 200         if (prepare_revision_walk(rev))
 201                 die("revision walk setup failed");
 202
 203         if (rev->early_output)
 204                 finish_early_output(rev);
 205
 206         while ((commit = get_revision(rev)) != NULL) {
 207                 log_tree_commit(rev, commit);
 208                 if (!rev->reflog_info) {
 209                         /* we allow cycles in reflog ancestry */
 210                         free(commit->buffer);
 211                         commit->buffer = NULL;
 212                 }
 213                 free_commit_list(commit->parents);
 214                 commit->parents = NULL;
 215         }
 216         return 0;
 217 }
 218
 219 static int git_log_config(const char *var, const char *value)
 220 {
 221         if (!strcmp(var, "format.subjectprefix")) {
 222                 if (!value)
 223                         config_error_nonbool(var);
 224                 fmt_patch_subject_prefix = xstrdup(value);
 225                 return 0;
 226         }
 227         if (!strcmp(var, "log.showroot")) {
 228                 default_show_root = git_config_bool(var, value);
 229                 return 0;
 230         }
 231         return git_diff_ui_config(var, value);
 232 }
 233
 234 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 235 {
 236         struct rev_info rev;
 237
 238         git_config(git_log_config);
 239         init_revisions(&rev, prefix);
 240         rev.diff = 1;
 241         rev.simplify_history = 0;
 242         cmd_log_init(argc, argv, prefix, &rev);
 243         if (!rev.diffopt.output_format)
 244                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 245         return cmd_log_walk(&rev);
 246 }
 247
 248 static void show_tagger(char *buf, int len, struct rev_info *rev)
 249 {
 250         char *email_end, *p;
 251         unsigned long date;
 252         int tz;
 253
 254         email_end = memchr(buf, '>', len);
 255         if (!email_end)
 256                 return;
 257         p = ++email_end;
 258         while (isspace(*p))
 259                 p++;
 260         date = strtoul(p, &p, 10);
 261         while (isspace(*p))
 262                 p++;
 263         tz = (int)strtol(p, NULL, 10);
 264         printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
 265                show_date(date, tz, rev->date_mode));
 266 }
 267
 268 static int show_object(const unsigned char *sha1, int show_tag_object,
 269         struct rev_info *rev)
 270 {
 271         unsigned long size;
 272         enum object_type type;
 273         char *buf = read_sha1_file(sha1, &type, &size);
 274         int offset = 0;
 275
 276         if (!buf)
 277                 return error("Could not read object %s", sha1_to_hex(sha1));
 278
 279         if (show_tag_object)
 280                 while (offset < size && buf[offset] != '\n') {
 281                         int new_offset = offset + 1;
 282                         while (new_offset < size && buf[new_offset++] != '\n')
 283                                 ; /* do nothing */
 284                         if (!prefixcmp(buf + offset, "tagger "))
 285                                 show_tagger(buf + offset + 7,
 286                                             new_offset - offset - 7, rev);
 287                         offset = new_offset;
 288                 }
 289
 290         if (offset < size)
 291                 fwrite(buf + offset, size - offset, 1, stdout);
 292         free(buf);
 293         return 0;
 294 }
 295
 296 static int show_tree_object(const unsigned char *sha1,
 297                 const char *base, int baselen,
 298                 const char *pathname, unsigned mode, int stage)
 299 {
 300         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 301         return 0;
 302 }
 303
 304 int cmd_show(int argc, const char **argv, const char *prefix)
 305 {
 306         struct rev_info rev;
 307         struct object_array_entry *objects;
 308         int i, count, ret = 0;
 309
 310         git_config(git_log_config);
 311         init_revisions(&rev, prefix);
 312         rev.diff = 1;
 313         rev.combine_merges = 1;
 314         rev.dense_combined_merges = 1;
 315         rev.always_show_header = 1;
 316         rev.ignore_merges = 0;
 317         rev.no_walk = 1;
 318         cmd_log_init(argc, argv, prefix, &rev);
 319
 320         count = rev.pending.nr;
 321         objects = rev.pending.objects;
 322         for (i = 0; i < count && !ret; i++) {
 323                 struct object *o = objects[i].item;
 324                 const char *name = objects[i].name;
 325                 switch (o->type) {
 326                 case OBJ_BLOB:
 327                         ret = show_object(o->sha1, 0, NULL);
 328                         break;
 329                 case OBJ_TAG: {
 330                         struct tag *t = (struct tag *)o;
 331
 332                         printf("%stag %s%s\n",
 333                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 334                                         t->tag,
 335                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 336                         ret = show_object(o->sha1, 1, &rev);
 337                         objects[i].item = (struct object *)t->tagged;
 338                         i--;
 339                         break;
 340                 }
 341                 case OBJ_TREE:
 342                         printf("%stree %s%s\n\n",
 343                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 344                                         name,
 345                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 346                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 347                                         show_tree_object);
 348                         break;
 349                 case OBJ_COMMIT:
 350                         rev.pending.nr = rev.pending.alloc = 0;
 351                         rev.pending.objects = NULL;
 352                         add_object_array(o, name, &rev.pending);
 353                         ret = cmd_log_walk(&rev);
 354                         break;
 355                 default:
 356                         ret = error("Unknown type: %d", o->type);
 357                 }
 358         }
 359         free(objects);
 360         return ret;
 361 }
 362
 363 /*
 364  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 365  */
 366 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 367 {
 368         struct rev_info rev;
 369
 370         git_config(git_log_config);
 371         init_revisions(&rev, prefix);
 372         init_reflog_walk(&rev.reflog_info);
 373         rev.abbrev_commit = 1;
 374         rev.verbose_header = 1;
 375         cmd_log_init(argc, argv, prefix, &rev);
 376
 377         /*
 378          * This means that we override whatever commit format the user gave
 379          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 380          * allow us to set a different default.
 381          */
 382         rev.commit_format = CMIT_FMT_ONELINE;
 383         rev.always_show_header = 1;
 384
 385         /*
 386          * We get called through "git reflog", so unlike the other log
 387          * routines, we need to set up our pager manually..
 388          */
 389         setup_pager();
 390
 391         return cmd_log_walk(&rev);
 392 }
 393
 394 int cmd_log(int argc, const char **argv, const char *prefix)
 395 {
 396         struct rev_info rev;
 397
 398         git_config(git_log_config);
 399         init_revisions(&rev, prefix);
 400         rev.always_show_header = 1;
 401         cmd_log_init(argc, argv, prefix, &rev);
 402         return cmd_log_walk(&rev);
 403 }
 404
 405 /* format-patch */
 406 #define FORMAT_PATCH_NAME_MAX 64
 407
 408 static int istitlechar(char c)
 409 {
 410         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 411                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 412 }
 413
 414 static char *extra_headers = NULL;
 415 static int extra_headers_size = 0;
 416 static const char *fmt_patch_suffix = ".patch";
 417 static int numbered = 0;
 418 static int auto_number = 0;
 419
 420 static int git_format_config(const char *var, const char *value)
 421 {
 422         if (!strcmp(var, "format.headers")) {
 423                 int len;
 424
 425                 if (!value)
 426                         die("format.headers without value");
 427                 len = strlen(value);
 428                 extra_headers_size += len + 1;
 429                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 430                 extra_headers[extra_headers_size - len - 1] = 0;
 431                 strcat(extra_headers, value);
 432                 return 0;
 433         }
 434         if (!strcmp(var, "format.suffix")) {
 435                 if (!value)
 436                         return config_error_nonbool(var);
 437                 fmt_patch_suffix = xstrdup(value);
 438                 return 0;
 439         }
 440         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 441                 return 0;
 442         }
 443         if (!strcmp(var, "format.numbered")) {
 444                 if (value && !strcasecmp(value, "auto")) {
 445                         auto_number = 1;
 446                         return 0;
 447                 }
 448                 numbered = git_config_bool(var, value);
 449                 return 0;
 450         }
 451
 452         return git_log_config(var, value);
 453 }
 454
 455
 456 static FILE *realstdout = NULL;
 457 static const char *output_directory = NULL;
 458
 459 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 460                          int numbered_files)
 461 {
 462         char filename[PATH_MAX];
 463         char *sol;
 464         int len = 0;
 465         int suffix_len = strlen(fmt_patch_suffix) + 1;
 466
 467         if (output_directory) {
 468                 if (strlen(output_directory) >=
 469                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 470                         return error("name of output directory is too long");
 471                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 472                 len = strlen(filename);
 473                 if (filename[len - 1] != '/')
 474                         filename[len++] = '/';
 475         }
 476
 477         if (numbered_files) {
 478                 sprintf(filename + len, "%d", nr);
 479                 len = strlen(filename);
 480
 481         } else {
 482                 sprintf(filename + len, "%04d", nr);
 483                 len = strlen(filename);
 484
 485                 sol = strstr(commit->buffer, "\n\n");
 486                 if (sol) {
 487                         int j, space = 1;
 488
 489                         sol += 2;
 490                         /* strip [PATCH] or [PATCH blabla] */
 491                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 492                                 char *eos = strchr(sol + 6, ']');
 493                                 if (eos) {
 494                                         while (isspace(*eos))
 495                                                 eos++;
 496                                         sol = eos;
 497                                 }
 498                         }
 499
 500                         for (j = 0;
 501                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 502                                      len < sizeof(filename) - suffix_len &&
 503                                      sol[j] && sol[j] != '\n';
 504                              j++) {
 505                                 if (istitlechar(sol[j])) {
 506                                         if (space) {
 507                                                 filename[len++] = '-';
 508                                                 space = 0;
 509                                         }
 510                                         filename[len++] = sol[j];
 511                                         if (sol[j] == '.')
 512                                                 while (sol[j + 1] == '.')
 513                                                         j++;
 514                                 } else
 515                                         space = 1;
 516                         }
 517                         while (filename[len - 1] == '.'
 518                                || filename[len - 1] == '-')
 519                                 len--;
 520                         filename[len] = 0;
 521                 }
 522                 if (len + suffix_len >= sizeof(filename))
 523                         return error("Patch pathname too long");
 524                 strcpy(filename + len, fmt_patch_suffix);
 525         }
 526
 527         fprintf(realstdout, "%s\n", filename);
 528         if (freopen(filename, "w", stdout) == NULL)
 529                 return error("Cannot open patch file %s",filename);
 530
 531         return 0;
 532 }
 533
 534 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 535 {
 536         struct rev_info check_rev;
 537         struct commit *commit;
 538         struct object *o1, *o2;
 539         unsigned flags1, flags2;
 540
 541         if (rev->pending.nr != 2)
 542                 die("Need exactly one range.");
 543
 544         o1 = rev->pending.objects[0].item;
 545         flags1 = o1->flags;
 546         o2 = rev->pending.objects[1].item;
 547         flags2 = o2->flags;
 548
 549         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 550                 die("Not a range.");
 551
 552         init_patch_ids(ids);
 553
 554         /* given a range a..b get all patch ids for b..a */
 555         init_revisions(&check_rev, prefix);
 556         o1->flags ^= UNINTERESTING;
 557         o2->flags ^= UNINTERESTING;
 558         add_pending_object(&check_rev, o1, "o1");
 559         add_pending_object(&check_rev, o2, "o2");
 560         if (prepare_revision_walk(&check_rev))
 561                 die("revision walk setup failed");
 562
 563         while ((commit = get_revision(&check_rev)) != NULL) {
 564                 /* ignore merges */
 565                 if (commit->parents && commit->parents->next)
 566                         continue;
 567
 568                 add_commit_patch_id(commit, ids);
 569         }
 570
 571         /* reset for next revision walk */
 572         clear_commit_marks((struct commit *)o1,
 573                         SEEN | UNINTERESTING | SHOWN | ADDED);
 574         clear_commit_marks((struct commit *)o2,
 575                         SEEN | UNINTERESTING | SHOWN | ADDED);
 576         o1->flags = flags1;
 577         o2->flags = flags2;
 578 }
 579
 580 static void gen_message_id(char *dest, unsigned int length, char *base)
 581 {
 582         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 583         const char *email_start = strrchr(committer, '<');
 584         const char *email_end = strrchr(committer, '>');
 585         if(!email_start || !email_end || email_start > email_end - 1)
 586                 die("Could not extract email from committer identity.");
 587         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 588                  (unsigned long) time(NULL),
 589                  (int)(email_end - email_start - 1), email_start + 1);
 590 }
 591
 592 static const char *clean_message_id(const char *msg_id)
 593 {
 594         char ch;
 595         const char *a, *z, *m;
 596
 597         m = msg_id;
 598         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 599                 m++;
 600         a = m;
 601         z = NULL;
 602         while ((ch = *m)) {
 603                 if (!isspace(ch) && (ch != '>'))
 604                         z = m;
 605                 m++;
 606         }
 607         if (!z)
 608                 die("insane in-reply-to: %s", msg_id);
 609         if (++z == m)
 610                 return a;
 611         return xmemdupz(a, z - a);
 612 }
 613
 614 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 615 {
 616         struct commit *commit;
 617         struct commit **list = NULL;
 618         struct rev_info rev;
 619         int nr = 0, total, i, j;
 620         int use_stdout = 0;
 621         int start_number = -1;
 622         int keep_subject = 0;
 623         int numbered_files = 0;         /* _just_ numbers */
 624         int subject_prefix = 0;
 625         int ignore_if_in_upstream = 0;
 626         int thread = 0;
 627         const char *in_reply_to = NULL;
 628         struct patch_ids ids;
 629         char *add_signoff = NULL;
 630         char message_id[1024];
 631         char ref_message_id[1024];
 632
 633         git_config(git_format_config);
 634         init_revisions(&rev, prefix);
 635         rev.commit_format = CMIT_FMT_EMAIL;
 636         rev.verbose_header = 1;
 637         rev.diff = 1;
 638         rev.combine_merges = 0;
 639         rev.ignore_merges = 1;
 640         rev.diffopt.msg_sep = "";
 641         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 642
 643         rev.subject_prefix = fmt_patch_subject_prefix;
 644         rev.extra_headers = extra_headers;
 645
 646         /*
 647          * Parse the arguments before setup_revisions(), or something
 648          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 649          * possibly a valid SHA1.
 650          */
 651         for (i = 1, j = 1; i < argc; i++) {
 652                 if (!strcmp(argv[i], "--stdout"))
 653                         use_stdout = 1;
 654                 else if (!strcmp(argv[i], "-n") ||
 655                                 !strcmp(argv[i], "--numbered"))
 656                         numbered = 1;
 657                 else if (!strcmp(argv[i], "-N") ||
 658                                 !strcmp(argv[i], "--no-numbered")) {
 659                         numbered = 0;
 660                         auto_number = 0;
 661                 }
 662                 else if (!prefixcmp(argv[i], "--start-number="))
 663                         start_number = strtol(argv[i] + 15, NULL, 10);
 664                 else if (!strcmp(argv[i], "--numbered-files"))
 665                         numbered_files = 1;
 666                 else if (!strcmp(argv[i], "--start-number")) {
 667                         i++;
 668                         if (i == argc)
 669                                 die("Need a number for --start-number");
 670                         start_number = strtol(argv[i], NULL, 10);
 671                 }
 672                 else if (!strcmp(argv[i], "-k") ||
 673                                 !strcmp(argv[i], "--keep-subject")) {
 674                         keep_subject = 1;
 675                         rev.total = -1;
 676                 }
 677                 else if (!strcmp(argv[i], "--output-directory") ||
 678                          !strcmp(argv[i], "-o")) {
 679                         i++;
 680                         if (argc <= i)
 681                                 die("Which directory?");
 682                         if (output_directory)
 683                                 die("Two output directories?");
 684                         output_directory = argv[i];
 685                 }
 686                 else if (!strcmp(argv[i], "--signoff") ||
 687                          !strcmp(argv[i], "-s")) {
 688                         const char *committer;
 689                         const char *endpos;
 690                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 691                         endpos = strchr(committer, '>');
 692                         if (!endpos)
 693                                 die("bogos committer info %s\n", committer);
 694                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 695                 }
 696                 else if (!strcmp(argv[i], "--attach")) {
 697                         rev.mime_boundary = git_version_string;
 698                         rev.no_inline = 1;
 699                 }
 700                 else if (!prefixcmp(argv[i], "--attach=")) {
 701                         rev.mime_boundary = argv[i] + 9;
 702                         rev.no_inline = 1;
 703                 }
 704                 else if (!strcmp(argv[i], "--inline")) {
 705                         rev.mime_boundary = git_version_string;
 706                         rev.no_inline = 0;
 707                 }
 708                 else if (!prefixcmp(argv[i], "--inline=")) {
 709                         rev.mime_boundary = argv[i] + 9;
 710                         rev.no_inline = 0;
 711                 }
 712                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 713                         ignore_if_in_upstream = 1;
 714                 else if (!strcmp(argv[i], "--thread"))
 715                         thread = 1;
 716                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 717                         in_reply_to = argv[i] + 14;
 718                 else if (!strcmp(argv[i], "--in-reply-to")) {
 719                         i++;
 720                         if (i == argc)
 721                                 die("Need a Message-Id for --in-reply-to");
 722                         in_reply_to = argv[i];
 723                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 724                         subject_prefix = 1;
 725                         rev.subject_prefix = argv[i] + 17;
 726                 } else if (!prefixcmp(argv[i], "--suffix="))
 727                         fmt_patch_suffix = argv[i] + 9;
 728                 else
 729                         argv[j++] = argv[i];
 730         }
 731         argc = j;
 732
 733         if (start_number < 0)
 734                 start_number = 1;
 735         if (numbered && keep_subject)
 736                 die ("-n and -k are mutually exclusive.");
 737         if (keep_subject && subject_prefix)
 738                 die ("--subject-prefix and -k are mutually exclusive.");
 739         if (numbered_files && use_stdout)
 740                 die ("--numbered-files and --stdout are mutually exclusive.");
 741
 742         argc = setup_revisions(argc, argv, &rev, "HEAD");
 743         if (argc > 1)
 744                 die ("unrecognized argument: %s", argv[1]);
 745
 746         if (!rev.diffopt.output_format)
 747                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 748
 749         if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
 750                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 751
 752         if (!output_directory && !use_stdout)
 753                 output_directory = prefix;
 754
 755         if (output_directory) {
 756                 if (use_stdout)
 757                         die("standard output, or directory, which one?");
 758                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 759                         die("Could not create directory %s",
 760                             output_directory);
 761         }
 762
 763         if (rev.pending.nr == 1) {
 764                 if (rev.max_count < 0 && !rev.show_root_diff) {
 765                         /*
 766                          * This is traditional behaviour of "git format-patch
 767                          * origin" that prepares what the origin side still
 768                          * does not have.
 769                          */
 770                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 771                         add_head_to_pending(&rev);
 772                 }
 773                 /*
 774                  * Otherwise, it is "format-patch -22 HEAD", and/or
 775                  * "format-patch --root HEAD".  The user wants
 776                  * get_revision() to do the usual traversal.
 777                  */
 778         }
 779
 780         if (ignore_if_in_upstream)
 781                 get_patch_ids(&rev, &ids, prefix);
 782
 783         if (!use_stdout)
 784                 realstdout = xfdopen(xdup(1), "w");
 785
 786         if (prepare_revision_walk(&rev))
 787                 die("revision walk setup failed");
 788         while ((commit = get_revision(&rev)) != NULL) {
 789                 /* ignore merges */
 790                 if (commit->parents && commit->parents->next)
 791                         continue;
 792
 793                 if (ignore_if_in_upstream &&
 794                                 has_commit_patch_id(commit, &ids))
 795                         continue;
 796
 797                 nr++;
 798                 list = xrealloc(list, nr * sizeof(list[0]));
 799                 list[nr - 1] = commit;
 800         }
 801         total = nr;
 802         if (!keep_subject && auto_number && total > 1)
 803                 numbered = 1;
 804         if (numbered)
 805                 rev.total = total + start_number - 1;
 806         rev.add_signoff = add_signoff;
 807         if (in_reply_to)
 808                 rev.ref_message_id = clean_message_id(in_reply_to);
 809         while (0 <= --nr) {
 810                 int shown;
 811                 commit = list[nr];
 812                 rev.nr = total - nr + (start_number - 1);
 813                 /* Make the second and subsequent mails replies to the first */
 814                 if (thread) {
 815                         if (nr == (total - 2)) {
 816                                 strncpy(ref_message_id, message_id,
 817                                         sizeof(ref_message_id));
 818                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 819                                 rev.ref_message_id = ref_message_id;
 820                         }
 821                         gen_message_id(message_id, sizeof(message_id),
 822                                        sha1_to_hex(commit->object.sha1));
 823                         rev.message_id = message_id;
 824                 }
 825                 if (!use_stdout)
 826                         if (reopen_stdout(commit, rev.nr, keep_subject,
 827                                           numbered_files))
 828                                 die("Failed to create output files");
 829                 shown = log_tree_commit(&rev, commit);
 830                 free(commit->buffer);
 831                 commit->buffer = NULL;
 832
 833                 /* We put one extra blank line between formatted
 834                  * patches and this flag is used by log-tree code
 835                  * to see if it needs to emit a LF before showing
 836                  * the log; when using one file per patch, we do
 837                  * not want the extra blank line.
 838                  */
 839                 if (!use_stdout)
 840                         rev.shown_one = 0;
 841                 if (shown) {
 842                         if (rev.mime_boundary)
 843                                 printf("\n--%s%s--\n\n\n",
 844                                        mime_boundary_leader,
 845                                        rev.mime_boundary);
 846                         else
 847                                 printf("-- \n%s\n\n", git_version_string);
 848                 }
 849                 if (!use_stdout)
 850                         fclose(stdout);
 851         }
 852         free(list);
 853         if (ignore_if_in_upstream)
 854                 free_patch_ids(&ids);
 855         return 0;
 856 }
 857
 858 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 859 {
 860         unsigned char sha1[20];
 861         if (get_sha1(arg, sha1) == 0) {
 862                 struct commit *commit = lookup_commit_reference(sha1);
 863                 if (commit) {
 864                         commit->object.flags |= flags;
 865                         add_pending_object(revs, &commit->object, arg);
 866                         return 0;
 867                 }
 868         }
 869         return -1;
 870 }
 871
 872 static const char cherry_usage[] =
 873 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 874 int cmd_cherry(int argc, const char **argv, const char *prefix)
 875 {
 876         struct rev_info revs;
 877         struct patch_ids ids;
 878         struct commit *commit;
 879         struct commit_list *list = NULL;
 880         const char *upstream;
 881         const char *head = "HEAD";
 882         const char *limit = NULL;
 883         int verbose = 0;
 884
 885         if (argc > 1 && !strcmp(argv[1], "-v")) {
 886                 verbose = 1;
 887                 argc--;
 888                 argv++;
 889         }
 890
 891         switch (argc) {
 892         case 4:
 893                 limit = argv[3];
 894                 /* FALLTHROUGH */
 895         case 3:
 896                 head = argv[2];
 897                 /* FALLTHROUGH */
 898         case 2:
 899                 upstream = argv[1];
 900                 break;
 901         default:
 902                 usage(cherry_usage);
 903         }
 904
 905         init_revisions(&revs, prefix);
 906         revs.diff = 1;
 907         revs.combine_merges = 0;
 908         revs.ignore_merges = 1;
 909         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 910
 911         if (add_pending_commit(head, &revs, 0))
 912                 die("Unknown commit %s", head);
 913         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 914                 die("Unknown commit %s", upstream);
 915
 916         /* Don't say anything if head and upstream are the same. */
 917         if (revs.pending.nr == 2) {
 918                 struct object_array_entry *o = revs.pending.objects;
 919                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 920                         return 0;
 921         }
 922
 923         get_patch_ids(&revs, &ids, prefix);
 924
 925         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 926                 die("Unknown commit %s", limit);
 927
 928         /* reverse the list of commits */
 929         if (prepare_revision_walk(&revs))
 930                 die("revision walk setup failed");
 931         while ((commit = get_revision(&revs)) != NULL) {
 932                 /* ignore merges */
 933                 if (commit->parents && commit->parents->next)
 934                         continue;
 935
 936                 commit_list_insert(commit, &list);
 937         }
 938
 939         while (list) {
 940                 char sign = '+';
 941
 942                 commit = list->item;
 943                 if (has_commit_patch_id(commit, &ids))
 944                         sign = '-';
 945
 946                 if (verbose) {
 947                         struct strbuf buf;
 948                         strbuf_init(&buf, 0);
 949                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
 950                                             &buf, 0, NULL, NULL, 0, 0);
 951                         printf("%c %s %s\n", sign,
 952                                sha1_to_hex(commit->object.sha1), buf.buf);
 953                         strbuf_release(&buf);
 954                 }
 955                 else {
 956                         printf("%c %s\n", sign,
 957                                sha1_to_hex(commit->object.sha1));
 958                 }
 959
 960                 list = list->next;
 961         }
 962
 963         free_patch_ids(&ids);
 964         return 0;
 965 }