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
  17 static int default_show_root = 1;
  18
  19 /* this is in builtin-diff.c */
  20 void add_head(struct rev_info *revs);
  21
  22 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  23                       struct rev_info *rev)
  24 {
  25         int i;
  26
  27         rev->abbrev = DEFAULT_ABBREV;
  28         rev->commit_format = CMIT_FMT_DEFAULT;
  29         rev->verbose_header = 1;
  30         rev->show_root_diff = default_show_root;
  31         argc = setup_revisions(argc, argv, rev, "HEAD");
  32         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  33                 rev->always_show_header = 0;
  34         for (i = 1; i < argc; i++) {
  35                 const char *arg = argv[i];
  36                 if (!prefixcmp(arg, "--encoding=")) {
  37                         arg += 11;
  38                         if (strcmp(arg, "none"))
  39                                 git_log_output_encoding = xstrdup(arg);
  40                         else
  41                                 git_log_output_encoding = "";
  42                 }
  43                 else
  44                         die("unrecognized argument: %s", arg);
  45         }
  46 }
  47
  48 static int cmd_log_walk(struct rev_info *rev)
  49 {
  50         struct commit *commit;
  51
  52         prepare_revision_walk(rev);
  53         while ((commit = get_revision(rev)) != NULL) {
  54                 log_tree_commit(rev, commit);
  55                 if (!rev->reflog_info) {
  56                         /* we allow cycles in reflog ancestry */
  57                         free(commit->buffer);
  58                         commit->buffer = NULL;
  59                 }
  60                 free_commit_list(commit->parents);
  61                 commit->parents = NULL;
  62         }
  63         return 0;
  64 }
  65
  66 static int git_log_config(const char *var, const char *value)
  67 {
  68         if (!strcmp(var, "log.showroot")) {
  69                 default_show_root = git_config_bool(var, value);
  70                 return 0;
  71         }
  72         return git_diff_ui_config(var, value);
  73 }
  74
  75 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
  76 {
  77         struct rev_info rev;
  78
  79         git_config(git_log_config);
  80         init_revisions(&rev, prefix);
  81         rev.diff = 1;
  82         rev.diffopt.recursive = 1;
  83         rev.simplify_history = 0;
  84         cmd_log_init(argc, argv, prefix, &rev);
  85         if (!rev.diffopt.output_format)
  86                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  87         return cmd_log_walk(&rev);
  88 }
  89
  90 static int show_object(const unsigned char *sha1, int suppress_header)
  91 {
  92         unsigned long size;
  93         enum object_type type;
  94         char *buf = read_sha1_file(sha1, &type, &size);
  95         int offset = 0;
  96
  97         if (!buf)
  98                 return error("Could not read object %s", sha1_to_hex(sha1));
  99
 100         if (suppress_header)
 101                 while (offset < size && buf[offset++] != '\n') {
 102                         int new_offset = offset;
 103                         while (new_offset < size && buf[new_offset++] != '\n')
 104                                 ; /* do nothing */
 105                         offset = new_offset;
 106                 }
 107
 108         if (offset < size)
 109                 fwrite(buf + offset, size - offset, 1, stdout);
 110         free(buf);
 111         return 0;
 112 }
 113
 114 static int show_tree_object(const unsigned char *sha1,
 115                 const char *base, int baselen,
 116                 const char *pathname, unsigned mode, int stage)
 117 {
 118         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 119         return 0;
 120 }
 121
 122 int cmd_show(int argc, const char **argv, const char *prefix)
 123 {
 124         struct rev_info rev;
 125         struct object_array_entry *objects;
 126         int i, count, ret = 0;
 127
 128         git_config(git_log_config);
 129         init_revisions(&rev, prefix);
 130         rev.diff = 1;
 131         rev.diffopt.recursive = 1;
 132         rev.combine_merges = 1;
 133         rev.dense_combined_merges = 1;
 134         rev.always_show_header = 1;
 135         rev.ignore_merges = 0;
 136         rev.no_walk = 1;
 137         cmd_log_init(argc, argv, prefix, &rev);
 138
 139         count = rev.pending.nr;
 140         objects = rev.pending.objects;
 141         for (i = 0; i < count && !ret; i++) {
 142                 struct object *o = objects[i].item;
 143                 const char *name = objects[i].name;
 144                 switch (o->type) {
 145                 case OBJ_BLOB:
 146                         ret = show_object(o->sha1, 0);
 147                         break;
 148                 case OBJ_TAG: {
 149                         struct tag *t = (struct tag *)o;
 150
 151                         printf("%stag %s%s\n\n",
 152                                         diff_get_color(rev.diffopt.color_diff,
 153                                                 DIFF_COMMIT),
 154                                         t->tag,
 155                                         diff_get_color(rev.diffopt.color_diff,
 156                                                 DIFF_RESET));
 157                         ret = show_object(o->sha1, 1);
 158                         objects[i].item = (struct object *)t->tagged;
 159                         i--;
 160                         break;
 161                 }
 162                 case OBJ_TREE:
 163                         printf("%stree %s%s\n\n",
 164                                         diff_get_color(rev.diffopt.color_diff,
 165                                                 DIFF_COMMIT),
 166                                         name,
 167                                         diff_get_color(rev.diffopt.color_diff,
 168                                                 DIFF_RESET));
 169                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 170                                         show_tree_object);
 171                         break;
 172                 case OBJ_COMMIT:
 173                         rev.pending.nr = rev.pending.alloc = 0;
 174                         rev.pending.objects = NULL;
 175                         add_object_array(o, name, &rev.pending);
 176                         ret = cmd_log_walk(&rev);
 177                         break;
 178                 default:
 179                         ret = error("Unknown type: %d", o->type);
 180                 }
 181         }
 182         free(objects);
 183         return ret;
 184 }
 185
 186 /*
 187  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 188  */
 189 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 190 {
 191         struct rev_info rev;
 192
 193         git_config(git_log_config);
 194         init_revisions(&rev, prefix);
 195         init_reflog_walk(&rev.reflog_info);
 196         rev.abbrev_commit = 1;
 197         rev.verbose_header = 1;
 198         cmd_log_init(argc, argv, prefix, &rev);
 199
 200         /*
 201          * This means that we override whatever commit format the user gave
 202          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 203          * allow us to set a different default.
 204          */
 205         rev.commit_format = CMIT_FMT_ONELINE;
 206         rev.always_show_header = 1;
 207
 208         /*
 209          * We get called through "git reflog", so unlike the other log
 210          * routines, we need to set up our pager manually..
 211          */
 212         setup_pager();
 213
 214         return cmd_log_walk(&rev);
 215 }
 216
 217 int cmd_log(int argc, const char **argv, const char *prefix)
 218 {
 219         struct rev_info rev;
 220
 221         git_config(git_log_config);
 222         init_revisions(&rev, prefix);
 223         rev.always_show_header = 1;
 224         cmd_log_init(argc, argv, prefix, &rev);
 225         return cmd_log_walk(&rev);
 226 }
 227
 228 /* format-patch */
 229 #define FORMAT_PATCH_NAME_MAX 64
 230
 231 static int istitlechar(char c)
 232 {
 233         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 234                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 235 }
 236
 237 static char *extra_headers = NULL;
 238 static int extra_headers_size = 0;
 239 static const char *fmt_patch_suffix = ".patch";
 240
 241 static int git_format_config(const char *var, const char *value)
 242 {
 243         if (!strcmp(var, "format.headers")) {
 244                 int len;
 245
 246                 if (!value)
 247                         die("format.headers without value");
 248                 len = strlen(value);
 249                 extra_headers_size += len + 1;
 250                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 251                 extra_headers[extra_headers_size - len - 1] = 0;
 252                 strcat(extra_headers, value);
 253                 return 0;
 254         }
 255         if (!strcmp(var, "format.suffix")) {
 256                 if (!value)
 257                         die("format.suffix without value");
 258                 fmt_patch_suffix = xstrdup(value);
 259                 return 0;
 260         }
 261         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 262                 return 0;
 263         }
 264         return git_log_config(var, value);
 265 }
 266
 267
 268 static FILE *realstdout = NULL;
 269 static const char *output_directory = NULL;
 270
 271 static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
 272 {
 273         char filename[PATH_MAX];
 274         char *sol;
 275         int len = 0;
 276         int suffix_len = strlen(fmt_patch_suffix) + 1;
 277
 278         if (output_directory) {
 279                 if (strlen(output_directory) >=
 280                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 281                         return error("name of output directory is too long");
 282                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 283                 len = strlen(filename);
 284                 if (filename[len - 1] != '/')
 285                         filename[len++] = '/';
 286         }
 287
 288         sprintf(filename + len, "%04d", nr);
 289         len = strlen(filename);
 290
 291         sol = strstr(commit->buffer, "\n\n");
 292         if (sol) {
 293                 int j, space = 1;
 294
 295                 sol += 2;
 296                 /* strip [PATCH] or [PATCH blabla] */
 297                 if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 298                         char *eos = strchr(sol + 6, ']');
 299                         if (eos) {
 300                                 while (isspace(*eos))
 301                                         eos++;
 302                                 sol = eos;
 303                         }
 304                 }
 305
 306                 for (j = 0;
 307                      j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 308                              len < sizeof(filename) - suffix_len &&
 309                              sol[j] && sol[j] != '\n';
 310                      j++) {
 311                         if (istitlechar(sol[j])) {
 312                                 if (space) {
 313                                         filename[len++] = '-';
 314                                         space = 0;
 315                                 }
 316                                 filename[len++] = sol[j];
 317                                 if (sol[j] == '.')
 318                                         while (sol[j + 1] == '.')
 319                                                 j++;
 320                         } else
 321                                 space = 1;
 322                 }
 323                 while (filename[len - 1] == '.' || filename[len - 1] == '-')
 324                         len--;
 325                 filename[len] = 0;
 326         }
 327         if (len + suffix_len >= sizeof(filename))
 328                 return error("Patch pathname too long");
 329         strcpy(filename + len, fmt_patch_suffix);
 330         fprintf(realstdout, "%s\n", filename);
 331         if (freopen(filename, "w", stdout) == NULL)
 332                 return error("Cannot open patch file %s",filename);
 333         return 0;
 334
 335 }
 336
 337 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 338 {
 339         struct rev_info check_rev;
 340         struct commit *commit;
 341         struct object *o1, *o2;
 342         unsigned flags1, flags2;
 343
 344         if (rev->pending.nr != 2)
 345                 die("Need exactly one range.");
 346
 347         o1 = rev->pending.objects[0].item;
 348         flags1 = o1->flags;
 349         o2 = rev->pending.objects[1].item;
 350         flags2 = o2->flags;
 351
 352         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 353                 die("Not a range.");
 354
 355         init_patch_ids(ids);
 356
 357         /* given a range a..b get all patch ids for b..a */
 358         init_revisions(&check_rev, prefix);
 359         o1->flags ^= UNINTERESTING;
 360         o2->flags ^= UNINTERESTING;
 361         add_pending_object(&check_rev, o1, "o1");
 362         add_pending_object(&check_rev, o2, "o2");
 363         prepare_revision_walk(&check_rev);
 364
 365         while ((commit = get_revision(&check_rev)) != NULL) {
 366                 /* ignore merges */
 367                 if (commit->parents && commit->parents->next)
 368                         continue;
 369
 370                 add_commit_patch_id(commit, ids);
 371         }
 372
 373         /* reset for next revision walk */
 374         clear_commit_marks((struct commit *)o1,
 375                         SEEN | UNINTERESTING | SHOWN | ADDED);
 376         clear_commit_marks((struct commit *)o2,
 377                         SEEN | UNINTERESTING | SHOWN | ADDED);
 378         o1->flags = flags1;
 379         o2->flags = flags2;
 380 }
 381
 382 static void gen_message_id(char *dest, unsigned int length, char *base)
 383 {
 384         const char *committer = git_committer_info(-1);
 385         const char *email_start = strrchr(committer, '<');
 386         const char *email_end = strrchr(committer, '>');
 387         if(!email_start || !email_end || email_start > email_end - 1)
 388                 die("Could not extract email from committer identity.");
 389         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 390                  (unsigned long) time(NULL),
 391                  (int)(email_end - email_start - 1), email_start + 1);
 392 }
 393
 394 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 395 {
 396         struct commit *commit;
 397         struct commit **list = NULL;
 398         struct rev_info rev;
 399         int nr = 0, total, i, j;
 400         int use_stdout = 0;
 401         int numbered = 0;
 402         int start_number = -1;
 403         int keep_subject = 0;
 404         int subject_prefix = 0;
 405         int ignore_if_in_upstream = 0;
 406         int thread = 0;
 407         const char *in_reply_to = NULL;
 408         struct patch_ids ids;
 409         char *add_signoff = NULL;
 410         char message_id[1024];
 411         char ref_message_id[1024];
 412
 413         git_config(git_format_config);
 414         init_revisions(&rev, prefix);
 415         rev.commit_format = CMIT_FMT_EMAIL;
 416         rev.verbose_header = 1;
 417         rev.diff = 1;
 418         rev.combine_merges = 0;
 419         rev.ignore_merges = 1;
 420         rev.diffopt.msg_sep = "";
 421         rev.diffopt.recursive = 1;
 422         rev.subject_prefix = "PATCH";
 423
 424         rev.extra_headers = extra_headers;
 425
 426         /*
 427          * Parse the arguments before setup_revisions(), or something
 428          * like "git fmt-patch -o a123 HEAD^.." may fail; a123 is
 429          * possibly a valid SHA1.
 430          */
 431         for (i = 1, j = 1; i < argc; i++) {
 432                 if (!strcmp(argv[i], "--stdout"))
 433                         use_stdout = 1;
 434                 else if (!strcmp(argv[i], "-n") ||
 435                                 !strcmp(argv[i], "--numbered"))
 436                         numbered = 1;
 437                 else if (!prefixcmp(argv[i], "--start-number="))
 438                         start_number = strtol(argv[i] + 15, NULL, 10);
 439                 else if (!strcmp(argv[i], "--start-number")) {
 440                         i++;
 441                         if (i == argc)
 442                                 die("Need a number for --start-number");
 443                         start_number = strtol(argv[i], NULL, 10);
 444                 }
 445                 else if (!strcmp(argv[i], "-k") ||
 446                                 !strcmp(argv[i], "--keep-subject")) {
 447                         keep_subject = 1;
 448                         rev.total = -1;
 449                 }
 450                 else if (!strcmp(argv[i], "--output-directory") ||
 451                          !strcmp(argv[i], "-o")) {
 452                         i++;
 453                         if (argc <= i)
 454                                 die("Which directory?");
 455                         if (output_directory)
 456                                 die("Two output directories?");
 457                         output_directory = argv[i];
 458                 }
 459                 else if (!strcmp(argv[i], "--signoff") ||
 460                          !strcmp(argv[i], "-s")) {
 461                         const char *committer;
 462                         const char *endpos;
 463                         committer = git_committer_info(1);
 464                         endpos = strchr(committer, '>');
 465                         if (!endpos)
 466                                 die("bogos committer info %s\n", committer);
 467                         add_signoff = xmalloc(endpos - committer + 2);
 468                         memcpy(add_signoff, committer, endpos - committer + 1);
 469                         add_signoff[endpos - committer + 1] = 0;
 470                 }
 471                 else if (!strcmp(argv[i], "--attach")) {
 472                         rev.mime_boundary = git_version_string;
 473                         rev.no_inline = 1;
 474                 }
 475                 else if (!prefixcmp(argv[i], "--attach=")) {
 476                         rev.mime_boundary = argv[i] + 9;
 477                         rev.no_inline = 1;
 478                 }
 479                 else if (!strcmp(argv[i], "--inline")) {
 480                         rev.mime_boundary = git_version_string;
 481                         rev.no_inline = 0;
 482                 }
 483                 else if (!prefixcmp(argv[i], "--inline=")) {
 484                         rev.mime_boundary = argv[i] + 9;
 485                         rev.no_inline = 0;
 486                 }
 487                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 488                         ignore_if_in_upstream = 1;
 489                 else if (!strcmp(argv[i], "--thread"))
 490                         thread = 1;
 491                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 492                         in_reply_to = argv[i] + 14;
 493                 else if (!strcmp(argv[i], "--in-reply-to")) {
 494                         i++;
 495                         if (i == argc)
 496                                 die("Need a Message-Id for --in-reply-to");
 497                         in_reply_to = argv[i];
 498                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 499                         subject_prefix = 1;
 500                         rev.subject_prefix = argv[i] + 17;
 501                 } else if (!prefixcmp(argv[i], "--suffix="))
 502                         fmt_patch_suffix = argv[i] + 9;
 503                 else
 504                         argv[j++] = argv[i];
 505         }
 506         argc = j;
 507
 508         if (start_number < 0)
 509                 start_number = 1;
 510         if (numbered && keep_subject)
 511                 die ("-n and -k are mutually exclusive.");
 512         if (keep_subject && subject_prefix)
 513                 die ("--subject-prefix and -k are mutually exclusive.");
 514
 515         argc = setup_revisions(argc, argv, &rev, "HEAD");
 516         if (argc > 1)
 517                 die ("unrecognized argument: %s", argv[1]);
 518
 519         if (!rev.diffopt.output_format)
 520                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 521
 522         if (!rev.diffopt.text)
 523                 rev.diffopt.binary = 1;
 524
 525         if (!output_directory && !use_stdout)
 526                 output_directory = prefix;
 527
 528         if (output_directory) {
 529                 if (use_stdout)
 530                         die("standard output, or directory, which one?");
 531                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 532                         die("Could not create directory %s",
 533                             output_directory);
 534         }
 535
 536         if (rev.pending.nr == 1) {
 537                 if (rev.max_count < 0) {
 538                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 539                         add_head(&rev);
 540                 }
 541                 /* Otherwise, it is "format-patch -22 HEAD", and
 542                  * get_revision() would return only the specified count.
 543                  */
 544         }
 545
 546         if (ignore_if_in_upstream)
 547                 get_patch_ids(&rev, &ids, prefix);
 548
 549         if (!use_stdout)
 550                 realstdout = fdopen(dup(1), "w");
 551
 552         prepare_revision_walk(&rev);
 553         while ((commit = get_revision(&rev)) != NULL) {
 554                 /* ignore merges */
 555                 if (commit->parents && commit->parents->next)
 556                         continue;
 557
 558                 if (ignore_if_in_upstream &&
 559                                 has_commit_patch_id(commit, &ids))
 560                         continue;
 561
 562                 nr++;
 563                 list = xrealloc(list, nr * sizeof(list[0]));
 564                 list[nr - 1] = commit;
 565         }
 566         total = nr;
 567         if (numbered)
 568                 rev.total = total + start_number - 1;
 569         rev.add_signoff = add_signoff;
 570         rev.ref_message_id = in_reply_to;
 571         while (0 <= --nr) {
 572                 int shown;
 573                 commit = list[nr];
 574                 rev.nr = total - nr + (start_number - 1);
 575                 /* Make the second and subsequent mails replies to the first */
 576                 if (thread) {
 577                         if (nr == (total - 2)) {
 578                                 strncpy(ref_message_id, message_id,
 579                                         sizeof(ref_message_id));
 580                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 581                                 rev.ref_message_id = ref_message_id;
 582                         }
 583                         gen_message_id(message_id, sizeof(message_id),
 584                                        sha1_to_hex(commit->object.sha1));
 585                         rev.message_id = message_id;
 586                 }
 587                 if (!use_stdout)
 588                         if (reopen_stdout(commit, rev.nr, keep_subject))
 589                                 die("Failed to create output files");
 590                 shown = log_tree_commit(&rev, commit);
 591                 free(commit->buffer);
 592                 commit->buffer = NULL;
 593
 594                 /* We put one extra blank line between formatted
 595                  * patches and this flag is used by log-tree code
 596                  * to see if it needs to emit a LF before showing
 597                  * the log; when using one file per patch, we do
 598                  * not want the extra blank line.
 599                  */
 600                 if (!use_stdout)
 601                         rev.shown_one = 0;
 602                 if (shown) {
 603                         if (rev.mime_boundary)
 604                                 printf("\n--%s%s--\n\n\n",
 605                                        mime_boundary_leader,
 606                                        rev.mime_boundary);
 607                         else
 608                                 printf("-- \n%s\n\n", git_version_string);
 609                 }
 610                 if (!use_stdout)
 611                         fclose(stdout);
 612         }
 613         free(list);
 614         if (ignore_if_in_upstream)
 615                 free_patch_ids(&ids);
 616         return 0;
 617 }
 618
 619 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 620 {
 621         unsigned char sha1[20];
 622         if (get_sha1(arg, sha1) == 0) {
 623                 struct commit *commit = lookup_commit_reference(sha1);
 624                 if (commit) {
 625                         commit->object.flags |= flags;
 626                         add_pending_object(revs, &commit->object, arg);
 627                         return 0;
 628                 }
 629         }
 630         return -1;
 631 }
 632
 633 static const char cherry_usage[] =
 634 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 635 int cmd_cherry(int argc, const char **argv, const char *prefix)
 636 {
 637         struct rev_info revs;
 638         struct patch_ids ids;
 639         struct commit *commit;
 640         struct commit_list *list = NULL;
 641         const char *upstream;
 642         const char *head = "HEAD";
 643         const char *limit = NULL;
 644         int verbose = 0;
 645
 646         if (argc > 1 && !strcmp(argv[1], "-v")) {
 647                 verbose = 1;
 648                 argc--;
 649                 argv++;
 650         }
 651
 652         switch (argc) {
 653         case 4:
 654                 limit = argv[3];
 655                 /* FALLTHROUGH */
 656         case 3:
 657                 head = argv[2];
 658                 /* FALLTHROUGH */
 659         case 2:
 660                 upstream = argv[1];
 661                 break;
 662         default:
 663                 usage(cherry_usage);
 664         }
 665
 666         init_revisions(&revs, prefix);
 667         revs.diff = 1;
 668         revs.combine_merges = 0;
 669         revs.ignore_merges = 1;
 670         revs.diffopt.recursive = 1;
 671
 672         if (add_pending_commit(head, &revs, 0))
 673                 die("Unknown commit %s", head);
 674         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 675                 die("Unknown commit %s", upstream);
 676
 677         /* Don't say anything if head and upstream are the same. */
 678         if (revs.pending.nr == 2) {
 679                 struct object_array_entry *o = revs.pending.objects;
 680                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 681                         return 0;
 682         }
 683
 684         get_patch_ids(&revs, &ids, prefix);
 685
 686         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 687                 die("Unknown commit %s", limit);
 688
 689         /* reverse the list of commits */
 690         prepare_revision_walk(&revs);
 691         while ((commit = get_revision(&revs)) != NULL) {
 692                 /* ignore merges */
 693                 if (commit->parents && commit->parents->next)
 694                         continue;
 695
 696                 commit_list_insert(commit, &list);
 697         }
 698
 699         while (list) {
 700                 char sign = '+';
 701
 702                 commit = list->item;
 703                 if (has_commit_patch_id(commit, &ids))
 704                         sign = '-';
 705
 706                 if (verbose) {
 707                         static char buf[16384];
 708                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 709                                             buf, sizeof(buf), 0, NULL, NULL, 0);
 710                         printf("%c %s %s\n", sign,
 711                                sha1_to_hex(commit->object.sha1), buf);
 712                 }
 713                 else {
 714                         printf("%c %s\n", sign,
 715                                sha1_to_hex(commit->object.sha1));
 716                 }
 717
 718                 list = list->next;
 719         }
 720
 721         free_patch_ids(&ids);
 722         return 0;
 723 }