Andrew's git / gitweb.git / builtin-log.c
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builtin-log.con commit Merge branch 'maint' of git://linux-nfs.org/~bfields/git into maint (cecb98a)
   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
  16static int default_show_root = 1;
  17
  18/* this is in builtin-diff.c */
  19void add_head(struct rev_info *revs);
  20
  21static 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
  47static 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
  65static 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
  74int 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
  89static 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
 113static 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
 121int 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 */
 188int 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
 216int 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
 230static int istitlechar(char c)
 231{
 232        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 233                (c >= '0' && c <= '9') || c == '.' || c == '_';
 234}
 235
 236static char *extra_headers = NULL;
 237static int extra_headers_size = 0;
 238static const char *fmt_patch_suffix = ".patch";
 239
 240static 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
 267static FILE *realstdout = NULL;
 268static const char *output_directory = NULL;
 269
 270static 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
 336static 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
 348static 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
 398static 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
 410int 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
 630static 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
 644static const char cherry_usage[] =
 645"git-cherry [-v] <upstream> [<head>] [<limit>]";
 646int 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}