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
  16 static int default_show_root = 1;
  17
  18 /* this is in builtin-diff.c */
  19 void add_head(struct rev_info *revs);
  20
  21 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  22                       struct rev_info *rev)
  23 {
  24         int i;
  25
  26         rev->abbrev = DEFAULT_ABBREV;
  27         rev->commit_format = CMIT_FMT_DEFAULT;
  28         rev->verbose_header = 1;
  29         rev->show_root_diff = default_show_root;
  30         argc = setup_revisions(argc, argv, rev, "HEAD");
  31         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  32                 rev->always_show_header = 0;
  33         for (i = 1; i < argc; i++) {
  34                 const char *arg = argv[i];
  35                 if (!prefixcmp(arg, "--encoding=")) {
  36                         arg += 11;
  37                         if (strcmp(arg, "none"))
  38                                 git_log_output_encoding = xstrdup(arg);
  39                         else
  40                                 git_log_output_encoding = "";
  41                 }
  42                 else
  43                         die("unrecognized argument: %s", arg);
  44         }
  45 }
  46
  47 static int cmd_log_walk(struct rev_info *rev)
  48 {
  49         struct commit *commit;
  50
  51         prepare_revision_walk(rev);
  52         while ((commit = get_revision(rev)) != NULL) {
  53                 log_tree_commit(rev, commit);
  54                 if (!rev->reflog_info) {
  55                         /* we allow cycles in reflog ancestry */
  56                         free(commit->buffer);
  57                         commit->buffer = NULL;
  58                 }
  59                 free_commit_list(commit->parents);
  60                 commit->parents = NULL;
  61         }
  62         return 0;
  63 }
  64
  65 static int git_log_config(const char *var, const char *value)
  66 {
  67         if (!strcmp(var, "log.showroot")) {
  68                 default_show_root = git_config_bool(var, value);
  69                 return 0;
  70         }
  71         return git_diff_ui_config(var, value);
  72 }
  73
  74 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
  75 {
  76         struct rev_info rev;
  77
  78         git_config(git_log_config);
  79         init_revisions(&rev, prefix);
  80         rev.diff = 1;
  81         rev.diffopt.recursive = 1;
  82         rev.simplify_history = 0;
  83         cmd_log_init(argc, argv, prefix, &rev);
  84         if (!rev.diffopt.output_format)
  85                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  86         return cmd_log_walk(&rev);
  87 }
  88
  89 static int show_object(const unsigned char *sha1, int suppress_header)
  90 {
  91         unsigned long size;
  92         enum object_type type;
  93         char *buf = read_sha1_file(sha1, &type, &size);
  94         int offset = 0;
  95
  96         if (!buf)
  97                 return error("Could not read object %s", sha1_to_hex(sha1));
  98
  99         if (suppress_header)
 100                 while (offset < size && buf[offset++] != '\n') {
 101                         int new_offset = offset;
 102                         while (new_offset < size && buf[new_offset++] != '\n')
 103                                 ; /* do nothing */
 104                         offset = new_offset;
 105                 }
 106
 107         if (offset < size)
 108                 fwrite(buf + offset, size - offset, 1, stdout);
 109         free(buf);
 110         return 0;
 111 }
 112
 113 static int show_tree_object(const unsigned char *sha1,
 114                 const char *base, int baselen,
 115                 const char *pathname, unsigned mode, int stage)
 116 {
 117         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 118         return 0;
 119 }
 120
 121 int cmd_show(int argc, const char **argv, const char *prefix)
 122 {
 123         struct rev_info rev;
 124         struct object_array_entry *objects;
 125         int i, count, ret = 0;
 126
 127         git_config(git_log_config);
 128         init_revisions(&rev, prefix);
 129         rev.diff = 1;
 130         rev.diffopt.recursive = 1;
 131         rev.combine_merges = 1;
 132         rev.dense_combined_merges = 1;
 133         rev.always_show_header = 1;
 134         rev.ignore_merges = 0;
 135         rev.no_walk = 1;
 136         cmd_log_init(argc, argv, prefix, &rev);
 137
 138         count = rev.pending.nr;
 139         objects = rev.pending.objects;
 140         for (i = 0; i < count && !ret; i++) {
 141                 struct object *o = objects[i].item;
 142                 const char *name = objects[i].name;
 143                 switch (o->type) {
 144                 case OBJ_BLOB:
 145                         ret = show_object(o->sha1, 0);
 146                         break;
 147                 case OBJ_TAG: {
 148                         struct tag *t = (struct tag *)o;
 149
 150                         printf("%stag %s%s\n\n",
 151                                         diff_get_color(rev.diffopt.color_diff,
 152                                                 DIFF_COMMIT),
 153                                         t->tag,
 154                                         diff_get_color(rev.diffopt.color_diff,
 155                                                 DIFF_RESET));
 156                         ret = show_object(o->sha1, 1);
 157                         objects[i].item = (struct object *)t->tagged;
 158                         i--;
 159                         break;
 160                 }
 161                 case OBJ_TREE:
 162                         printf("%stree %s%s\n\n",
 163                                         diff_get_color(rev.diffopt.color_diff,
 164                                                 DIFF_COMMIT),
 165                                         name,
 166                                         diff_get_color(rev.diffopt.color_diff,
 167                                                 DIFF_RESET));
 168                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 169                                         show_tree_object);
 170                         break;
 171                 case OBJ_COMMIT:
 172                         rev.pending.nr = rev.pending.alloc = 0;
 173                         rev.pending.objects = NULL;
 174                         add_object_array(o, name, &rev.pending);
 175                         ret = cmd_log_walk(&rev);
 176                         break;
 177                 default:
 178                         ret = error("Unknown type: %d", o->type);
 179                 }
 180         }
 181         free(objects);
 182         return ret;
 183 }
 184
 185 /*
 186  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 187  */
 188 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 189 {
 190         struct rev_info rev;
 191
 192         git_config(git_log_config);
 193         init_revisions(&rev, prefix);
 194         init_reflog_walk(&rev.reflog_info);
 195         rev.abbrev_commit = 1;
 196         rev.verbose_header = 1;
 197         cmd_log_init(argc, argv, prefix, &rev);
 198
 199         /*
 200          * This means that we override whatever commit format the user gave
 201          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 202          * allow us to set a different default.
 203          */
 204         rev.commit_format = CMIT_FMT_ONELINE;
 205         rev.always_show_header = 1;
 206
 207         /*
 208          * We get called through "git reflog", so unlike the other log
 209          * routines, we need to set up our pager manually..
 210          */
 211         setup_pager();
 212
 213         return cmd_log_walk(&rev);
 214 }
 215
 216 int cmd_log(int argc, const char **argv, const char *prefix)
 217 {
 218         struct rev_info rev;
 219
 220         git_config(git_log_config);
 221         init_revisions(&rev, prefix);
 222         rev.always_show_header = 1;
 223         cmd_log_init(argc, argv, prefix, &rev);
 224         return cmd_log_walk(&rev);
 225 }
 226
 227 /* format-patch */
 228 #define FORMAT_PATCH_NAME_MAX 64
 229
 230 static int istitlechar(char c)
 231 {
 232         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 233                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 234 }
 235
 236 static char *extra_headers = NULL;
 237 static int extra_headers_size = 0;
 238 static const char *fmt_patch_suffix = ".patch";
 239
 240 static int git_format_config(const char *var, const char *value)
 241 {
 242         if (!strcmp(var, "format.headers")) {
 243                 int len;
 244
 245                 if (!value)
 246                         die("format.headers without value");
 247                 len = strlen(value);
 248                 extra_headers_size += len + 1;
 249                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 250                 extra_headers[extra_headers_size - len - 1] = 0;
 251                 strcat(extra_headers, value);
 252                 return 0;
 253         }
 254         if (!strcmp(var, "format.suffix")) {
 255                 if (!value)
 256                         die("format.suffix without value");
 257                 fmt_patch_suffix = xstrdup(value);
 258                 return 0;
 259         }
 260         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 261                 return 0;
 262         }
 263         return git_log_config(var, value);
 264 }
 265
 266
 267 static FILE *realstdout = NULL;
 268 static const char *output_directory = NULL;
 269
 270 static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
 271 {
 272         char filename[PATH_MAX];
 273         char *sol;
 274         int len = 0;
 275         int suffix_len = strlen(fmt_patch_suffix) + 1;
 276
 277         if (output_directory) {
 278                 if (strlen(output_directory) >=
 279                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 280                         return error("name of output directory is too long");
 281                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 282                 len = strlen(filename);
 283                 if (filename[len - 1] != '/')
 284                         filename[len++] = '/';
 285         }
 286
 287         sprintf(filename + len, "%04d", nr);
 288         len = strlen(filename);
 289
 290         sol = strstr(commit->buffer, "\n\n");
 291         if (sol) {
 292                 int j, space = 1;
 293
 294                 sol += 2;
 295                 /* strip [PATCH] or [PATCH blabla] */
 296                 if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 297                         char *eos = strchr(sol + 6, ']');
 298                         if (eos) {
 299                                 while (isspace(*eos))
 300                                         eos++;
 301                                 sol = eos;
 302                         }
 303                 }
 304
 305                 for (j = 0;
 306                      j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 307                              len < sizeof(filename) - suffix_len &&
 308                              sol[j] && sol[j] != '\n';
 309                      j++) {
 310                         if (istitlechar(sol[j])) {
 311                                 if (space) {
 312                                         filename[len++] = '-';
 313                                         space = 0;
 314                                 }
 315                                 filename[len++] = sol[j];
 316                                 if (sol[j] == '.')
 317                                         while (sol[j + 1] == '.')
 318                                                 j++;
 319                         } else
 320                                 space = 1;
 321                 }
 322                 while (filename[len - 1] == '.' || filename[len - 1] == '-')
 323                         len--;
 324                 filename[len] = 0;
 325         }
 326         if (len + suffix_len >= sizeof(filename))
 327                 return error("Patch pathname too long");
 328         strcpy(filename + len, fmt_patch_suffix);
 329         fprintf(realstdout, "%s\n", filename);
 330         if (freopen(filename, "w", stdout) == NULL)
 331                 return error("Cannot open patch file %s",filename);
 332         return 0;
 333
 334 }
 335
 336 static int get_patch_id(struct commit *commit, struct diff_options *options,
 337                 unsigned char *sha1)
 338 {
 339         if (commit->parents)
 340                 diff_tree_sha1(commit->parents->item->object.sha1,
 341                                commit->object.sha1, "", options);
 342         else
 343                 diff_root_tree_sha1(commit->object.sha1, "", options);
 344         diffcore_std(options);
 345         return diff_flush_patch_id(options, sha1);
 346 }
 347
 348 static void get_patch_ids(struct rev_info *rev, struct diff_options *options, const char *prefix)
 349 {
 350         struct rev_info check_rev;
 351         struct commit *commit;
 352         struct object *o1, *o2;
 353         unsigned flags1, flags2;
 354         unsigned char sha1[20];
 355
 356         if (rev->pending.nr != 2)
 357                 die("Need exactly one range.");
 358
 359         o1 = rev->pending.objects[0].item;
 360         flags1 = o1->flags;
 361         o2 = rev->pending.objects[1].item;
 362         flags2 = o2->flags;
 363
 364         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 365                 die("Not a range.");
 366
 367         diff_setup(options);
 368         options->recursive = 1;
 369         if (diff_setup_done(options) < 0)
 370                 die("diff_setup_done failed");
 371
 372         /* given a range a..b get all patch ids for b..a */
 373         init_revisions(&check_rev, prefix);
 374         o1->flags ^= UNINTERESTING;
 375         o2->flags ^= UNINTERESTING;
 376         add_pending_object(&check_rev, o1, "o1");
 377         add_pending_object(&check_rev, o2, "o2");
 378         prepare_revision_walk(&check_rev);
 379
 380         while ((commit = get_revision(&check_rev)) != NULL) {
 381                 /* ignore merges */
 382                 if (commit->parents && commit->parents->next)
 383                         continue;
 384
 385                 if (!get_patch_id(commit, options, sha1))
 386                         created_object(sha1, xcalloc(1, sizeof(struct object)));
 387         }
 388
 389         /* reset for next revision walk */
 390         clear_commit_marks((struct commit *)o1,
 391                         SEEN | UNINTERESTING | SHOWN | ADDED);
 392         clear_commit_marks((struct commit *)o2,
 393                         SEEN | UNINTERESTING | SHOWN | ADDED);
 394         o1->flags = flags1;
 395         o2->flags = flags2;
 396 }
 397
 398 static void gen_message_id(char *dest, unsigned int length, char *base)
 399 {
 400         const char *committer = git_committer_info(-1);
 401         const char *email_start = strrchr(committer, '<');
 402         const char *email_end = strrchr(committer, '>');
 403         if(!email_start || !email_end || email_start > email_end - 1)
 404                 die("Could not extract email from committer identity.");
 405         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 406                  (unsigned long) time(NULL),
 407                  (int)(email_end - email_start - 1), email_start + 1);
 408 }
 409
 410 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 411 {
 412         struct commit *commit;
 413         struct commit **list = NULL;
 414         struct rev_info rev;
 415         int nr = 0, total, i, j;
 416         int use_stdout = 0;
 417         int numbered = 0;
 418         int start_number = -1;
 419         int keep_subject = 0;
 420         int ignore_if_in_upstream = 0;
 421         int thread = 0;
 422         const char *in_reply_to = NULL;
 423         struct diff_options patch_id_opts;
 424         char *add_signoff = NULL;
 425         char message_id[1024];
 426         char ref_message_id[1024];
 427
 428         git_config(git_format_config);
 429         init_revisions(&rev, prefix);
 430         rev.commit_format = CMIT_FMT_EMAIL;
 431         rev.verbose_header = 1;
 432         rev.diff = 1;
 433         rev.combine_merges = 0;
 434         rev.ignore_merges = 1;
 435         rev.diffopt.msg_sep = "";
 436         rev.diffopt.recursive = 1;
 437
 438         rev.extra_headers = extra_headers;
 439
 440         /*
 441          * Parse the arguments before setup_revisions(), or something
 442          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 443          * possibly a valid SHA1.
 444          */
 445         for (i = 1, j = 1; i < argc; i++) {
 446                 if (!strcmp(argv[i], "--stdout"))
 447                         use_stdout = 1;
 448                 else if (!strcmp(argv[i], "-n") ||
 449                                 !strcmp(argv[i], "--numbered"))
 450                         numbered = 1;
 451                 else if (!prefixcmp(argv[i], "--start-number="))
 452                         start_number = strtol(argv[i] + 15, NULL, 10);
 453                 else if (!strcmp(argv[i], "--start-number")) {
 454                         i++;
 455                         if (i == argc)
 456                                 die("Need a number for --start-number");
 457                         start_number = strtol(argv[i], NULL, 10);
 458                 }
 459                 else if (!strcmp(argv[i], "-k") ||
 460                                 !strcmp(argv[i], "--keep-subject")) {
 461                         keep_subject = 1;
 462                         rev.total = -1;
 463                 }
 464                 else if (!strcmp(argv[i], "--output-directory") ||
 465                          !strcmp(argv[i], "-o")) {
 466                         i++;
 467                         if (argc <= i)
 468                                 die("Which directory?");
 469                         if (output_directory)
 470                                 die("Two output directories?");
 471                         output_directory = argv[i];
 472                 }
 473                 else if (!strcmp(argv[i], "--signoff") ||
 474                          !strcmp(argv[i], "-s")) {
 475                         const char *committer;
 476                         const char *endpos;
 477                         committer = git_committer_info(1);
 478                         endpos = strchr(committer, '>');
 479                         if (!endpos)
 480                                 die("bogos committer info %s\n", committer);
 481                         add_signoff = xmalloc(endpos - committer + 2);
 482                         memcpy(add_signoff, committer, endpos - committer + 1);
 483                         add_signoff[endpos - committer + 1] = 0;
 484                 }
 485                 else if (!strcmp(argv[i], "--attach")) {
 486                         rev.mime_boundary = git_version_string;
 487                         rev.no_inline = 1;
 488                 }
 489                 else if (!prefixcmp(argv[i], "--attach=")) {
 490                         rev.mime_boundary = argv[i] + 9;
 491                         rev.no_inline = 1;
 492                 }
 493                 else if (!strcmp(argv[i], "--inline")) {
 494                         rev.mime_boundary = git_version_string;
 495                         rev.no_inline = 0;
 496                 }
 497                 else if (!prefixcmp(argv[i], "--inline=")) {
 498                         rev.mime_boundary = argv[i] + 9;
 499                         rev.no_inline = 0;
 500                 }
 501                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 502                         ignore_if_in_upstream = 1;
 503                 else if (!strcmp(argv[i], "--thread"))
 504                         thread = 1;
 505                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 506                         in_reply_to = argv[i] + 14;
 507                 else if (!strcmp(argv[i], "--in-reply-to")) {
 508                         i++;
 509                         if (i == argc)
 510                                 die("Need a Message-Id for --in-reply-to");
 511                         in_reply_to = argv[i];
 512                 }
 513                 else if (!prefixcmp(argv[i], "--suffix="))
 514                         fmt_patch_suffix = argv[i] + 9;
 515                 else
 516                         argv[j++] = argv[i];
 517         }
 518         argc = j;
 519
 520         if (start_number < 0)
 521                 start_number = 1;
 522         if (numbered && keep_subject)
 523                 die ("-n and -k are mutually exclusive.");
 524
 525         argc = setup_revisions(argc, argv, &rev, "HEAD");
 526         if (argc > 1)
 527                 die ("unrecognized argument: %s", argv[1]);
 528
 529         if (!rev.diffopt.output_format)
 530                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 531
 532         if (!rev.diffopt.text)
 533                 rev.diffopt.binary = 1;
 534
 535         if (!output_directory && !use_stdout)
 536                 output_directory = prefix;
 537
 538         if (output_directory) {
 539                 if (use_stdout)
 540                         die("standard output, or directory, which one?");
 541                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 542                         die("Could not create directory %s",
 543                             output_directory);
 544         }
 545
 546         if (rev.pending.nr == 1) {
 547                 if (rev.max_count < 0) {
 548                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 549                         add_head(&rev);
 550                 }
 551                 /* Otherwise, it is "format-patch -22 HEAD", and
 552                  * get_revision() would return only the specified count.
 553                  */
 554         }
 555
 556         if (ignore_if_in_upstream)
 557                 get_patch_ids(&rev, &patch_id_opts, prefix);
 558
 559         if (!use_stdout)
 560                 realstdout = fdopen(dup(1), "w");
 561
 562         prepare_revision_walk(&rev);
 563         while ((commit = get_revision(&rev)) != NULL) {
 564                 unsigned char sha1[20];
 565
 566                 /* ignore merges */
 567                 if (commit->parents && commit->parents->next)
 568                         continue;
 569
 570                 if (ignore_if_in_upstream &&
 571                                 !get_patch_id(commit, &patch_id_opts, sha1) &&
 572                                 lookup_object(sha1))
 573                         continue;
 574
 575                 nr++;
 576                 list = xrealloc(list, nr * sizeof(list[0]));
 577                 list[nr - 1] = commit;
 578         }
 579         total = nr;
 580         if (numbered)
 581                 rev.total = total + start_number - 1;
 582         rev.add_signoff = add_signoff;
 583         rev.ref_message_id = in_reply_to;
 584         while (0 <= --nr) {
 585                 int shown;
 586                 commit = list[nr];
 587                 rev.nr = total - nr + (start_number - 1);
 588                 /* Make the second and subsequent mails replies to the first */
 589                 if (thread) {
 590                         if (nr == (total - 2)) {
 591                                 strncpy(ref_message_id, message_id,
 592                                         sizeof(ref_message_id));
 593                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 594                                 rev.ref_message_id = ref_message_id;
 595                         }
 596                         gen_message_id(message_id, sizeof(message_id),
 597                                        sha1_to_hex(commit->object.sha1));
 598                         rev.message_id = message_id;
 599                 }
 600                 if (!use_stdout)
 601                         if (reopen_stdout(commit, rev.nr, keep_subject))
 602                                 die("Failed to create output files");
 603                 shown = log_tree_commit(&rev, commit);
 604                 free(commit->buffer);
 605                 commit->buffer = NULL;
 606
 607                 /* We put one extra blank line between formatted
 608                  * patches and this flag is used by log-tree code
 609                  * to see if it needs to emit a LF before showing
 610                  * the log; when using one file per patch, we do
 611                  * not want the extra blank line.
 612                  */
 613                 if (!use_stdout)
 614                         rev.shown_one = 0;
 615                 if (shown) {
 616                         if (rev.mime_boundary)
 617                                 printf("\n--%s%s--\n\n\n",
 618                                        mime_boundary_leader,
 619                                        rev.mime_boundary);
 620                         else
 621                                 printf("-- \n%s\n\n", git_version_string);
 622                 }
 623                 if (!use_stdout)
 624                         fclose(stdout);
 625         }
 626         free(list);
 627         return 0;
 628 }
 629
 630 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 631 {
 632         unsigned char sha1[20];
 633         if (get_sha1(arg, sha1) == 0) {
 634                 struct commit *commit = lookup_commit_reference(sha1);
 635                 if (commit) {
 636                         commit->object.flags |= flags;
 637                         add_pending_object(revs, &commit->object, arg);
 638                         return 0;
 639                 }
 640         }
 641         return -1;
 642 }
 643
 644 static const char cherry_usage[] =
 645 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 646 int cmd_cherry(int argc, const char **argv, const char *prefix)
 647 {
 648         struct rev_info revs;
 649         struct diff_options patch_id_opts;
 650         struct commit *commit;
 651         struct commit_list *list = NULL;
 652         const char *upstream;
 653         const char *head = "HEAD";
 654         const char *limit = NULL;
 655         int verbose = 0;
 656
 657         if (argc > 1 && !strcmp(argv[1], "-v")) {
 658                 verbose = 1;
 659                 argc--;
 660                 argv++;
 661         }
 662
 663         switch (argc) {
 664         case 4:
 665                 limit = argv[3];
 666                 /* FALLTHROUGH */
 667         case 3:
 668                 head = argv[2];
 669                 /* FALLTHROUGH */
 670         case 2:
 671                 upstream = argv[1];
 672                 break;
 673         default:
 674                 usage(cherry_usage);
 675         }
 676
 677         init_revisions(&revs, prefix);
 678         revs.diff = 1;
 679         revs.combine_merges = 0;
 680         revs.ignore_merges = 1;
 681         revs.diffopt.recursive = 1;
 682
 683         if (add_pending_commit(head, &revs, 0))
 684                 die("Unknown commit %s", head);
 685         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 686                 die("Unknown commit %s", upstream);
 687
 688         /* Don't say anything if head and upstream are the same. */
 689         if (revs.pending.nr == 2) {
 690                 struct object_array_entry *o = revs.pending.objects;
 691                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 692                         return 0;
 693         }
 694
 695         get_patch_ids(&revs, &patch_id_opts, prefix);
 696
 697         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 698                 die("Unknown commit %s", limit);
 699
 700         /* reverse the list of commits */
 701         prepare_revision_walk(&revs);
 702         while ((commit = get_revision(&revs)) != NULL) {
 703                 /* ignore merges */
 704                 if (commit->parents && commit->parents->next)
 705                         continue;
 706
 707                 commit_list_insert(commit, &list);
 708         }
 709
 710         while (list) {
 711                 unsigned char sha1[20];
 712                 char sign = '+';
 713
 714                 commit = list->item;
 715                 if (!get_patch_id(commit, &patch_id_opts, sha1) &&
 716                     lookup_object(sha1))
 717                         sign = '-';
 718
 719                 if (verbose) {
 720                         static char buf[16384];
 721                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 722                                             buf, sizeof(buf), 0, NULL, NULL, 0);
 723                         printf("%c %s %s\n", sign,
 724                                sha1_to_hex(commit->object.sha1), buf);
 725                 }
 726                 else {
 727                         printf("%c %s\n", sign,
 728                                sha1_to_hex(commit->object.sha1));
 729                 }
 730
 731                 list = list->next;
 732         }
 733
 734         return 0;
 735 }