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 "refs.h"
   9 #include "color.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "log-tree.h"
  14 #include "builtin.h"
  15 #include "tag.h"
  16 #include "reflog-walk.h"
  17 #include "patch-ids.h"
  18 #include "run-command.h"
  19 #include "shortlog.h"
  20 #include "remote.h"
  21 #include "string-list.h"
  22 #include "parse-options.h"
  23 #include "line-log.h"
  24 #include "branch.h"
  25 #include "streaming.h"
  26 #include "version.h"
  27 #include "mailmap.h"
  28 #include "gpg-interface.h"
  29
  30 /* Set a default date-time format for git log ("log.date" config variable) */
  31 static const char *default_date_mode = NULL;
  32
  33 static int default_abbrev_commit;
  34 static int default_show_root = 1;
  35 static int default_follow;
  36 static int default_show_signature;
  37 static int decoration_style;
  38 static int decoration_given;
  39 static int use_mailmap_config;
  40 static const char *fmt_patch_subject_prefix = "PATCH";
  41 static const char *fmt_pretty;
  42
  43 static const char * const builtin_log_usage[] = {
  44         N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
  45         N_("git show [<options>] <object>..."),
  46         NULL
  47 };
  48
  49 struct line_opt_callback_data {
  50         struct rev_info *rev;
  51         const char *prefix;
  52         struct string_list args;
  53 };
  54
  55 static int auto_decoration_style(void)
  56 {
  57         return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
  58 }
  59
  60 static int parse_decoration_style(const char *var, const char *value)
  61 {
  62         switch (git_config_maybe_bool(var, value)) {
  63         case 1:
  64                 return DECORATE_SHORT_REFS;
  65         case 0:
  66                 return 0;
  67         default:
  68                 break;
  69         }
  70         if (!strcmp(value, "full"))
  71                 return DECORATE_FULL_REFS;
  72         else if (!strcmp(value, "short"))
  73                 return DECORATE_SHORT_REFS;
  74         else if (!strcmp(value, "auto"))
  75                 return auto_decoration_style();
  76         return -1;
  77 }
  78
  79 static int decorate_callback(const struct option *opt, const char *arg, int unset)
  80 {
  81         if (unset)
  82                 decoration_style = 0;
  83         else if (arg)
  84                 decoration_style = parse_decoration_style("command line", arg);
  85         else
  86                 decoration_style = DECORATE_SHORT_REFS;
  87
  88         if (decoration_style < 0)
  89                 die(_("invalid --decorate option: %s"), arg);
  90
  91         decoration_given = 1;
  92
  93         return 0;
  94 }
  95
  96 static int log_line_range_callback(const struct option *option, const char *arg, int unset)
  97 {
  98         struct line_opt_callback_data *data = option->value;
  99
 100         if (!arg)
 101                 return -1;
 102
 103         data->rev->line_level_traverse = 1;
 104         string_list_append(&data->args, arg);
 105
 106         return 0;
 107 }
 108
 109 static void init_log_defaults(void)
 110 {
 111         init_grep_defaults();
 112         init_diff_ui_defaults();
 113
 114         decoration_style = auto_decoration_style();
 115 }
 116
 117 static void cmd_log_init_defaults(struct rev_info *rev)
 118 {
 119         if (fmt_pretty)
 120                 get_commit_format(fmt_pretty, rev);
 121         if (default_follow)
 122                 DIFF_OPT_SET(&rev->diffopt, DEFAULT_FOLLOW_RENAMES);
 123         rev->verbose_header = 1;
 124         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
 125         rev->diffopt.stat_width = -1; /* use full terminal width */
 126         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
 127         rev->abbrev_commit = default_abbrev_commit;
 128         rev->show_root_diff = default_show_root;
 129         rev->subject_prefix = fmt_patch_subject_prefix;
 130         rev->show_signature = default_show_signature;
 131         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 132
 133         if (default_date_mode)
 134                 parse_date_format(default_date_mode, &rev->date_mode);
 135         rev->diffopt.touched_flags = 0;
 136 }
 137
 138 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 139                          struct rev_info *rev, struct setup_revision_opt *opt)
 140 {
 141         struct userformat_want w;
 142         int quiet = 0, source = 0, mailmap = 0;
 143         static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 144
 145         const struct option builtin_log_options[] = {
 146                 OPT__QUIET(&quiet, N_("suppress diff output")),
 147                 OPT_BOOL(0, "source", &source, N_("show source")),
 148                 OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
 149                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
 150                   PARSE_OPT_OPTARG, decorate_callback},
 151                 OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
 152                              N_("Process line range n,m in file, counting from 1"),
 153                              log_line_range_callback),
 154                 OPT_END()
 155         };
 156
 157         line_cb.rev = rev;
 158         line_cb.prefix = prefix;
 159
 160         mailmap = use_mailmap_config;
 161         argc = parse_options(argc, argv, prefix,
 162                              builtin_log_options, builtin_log_usage,
 163                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 164                              PARSE_OPT_KEEP_DASHDASH);
 165
 166         if (quiet)
 167                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
 168         argc = setup_revisions(argc, argv, rev, opt);
 169
 170         /* Any arguments at this point are not recognized */
 171         if (argc > 1)
 172                 die(_("unrecognized argument: %s"), argv[1]);
 173
 174         memset(&w, 0, sizeof(w));
 175         userformat_find_requirements(NULL, &w);
 176
 177         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 178                 rev->show_notes = 1;
 179         if (rev->show_notes)
 180                 init_display_notes(&rev->notes_opt);
 181
 182         if (rev->diffopt.pickaxe || rev->diffopt.filter ||
 183             DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES))
 184                 rev->always_show_header = 0;
 185
 186         if (source)
 187                 rev->show_source = 1;
 188
 189         if (mailmap) {
 190                 rev->mailmap = xcalloc(1, sizeof(struct string_list));
 191                 read_mailmap(rev->mailmap, NULL);
 192         }
 193
 194         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
 195                 /*
 196                  * "log --pretty=raw" is special; ignore UI oriented
 197                  * configuration variables such as decoration.
 198                  */
 199                 if (!decoration_given)
 200                         decoration_style = 0;
 201                 if (!rev->abbrev_commit_given)
 202                         rev->abbrev_commit = 0;
 203         }
 204
 205         if (decoration_style) {
 206                 rev->show_decorations = 1;
 207                 load_ref_decorations(decoration_style);
 208         }
 209
 210         if (rev->line_level_traverse)
 211                 line_log_init(rev, line_cb.prefix, &line_cb.args);
 212
 213         setup_pager();
 214 }
 215
 216 static void cmd_log_init(int argc, const char **argv, const char *prefix,
 217                          struct rev_info *rev, struct setup_revision_opt *opt)
 218 {
 219         cmd_log_init_defaults(rev);
 220         cmd_log_init_finish(argc, argv, prefix, rev, opt);
 221 }
 222
 223 /*
 224  * This gives a rough estimate for how many commits we
 225  * will print out in the list.
 226  */
 227 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 228 {
 229         int n = 0;
 230
 231         while (list) {
 232                 struct commit *commit = list->item;
 233                 unsigned int flags = commit->object.flags;
 234                 list = list->next;
 235                 if (!(flags & (TREESAME | UNINTERESTING)))
 236                         n++;
 237         }
 238         return n;
 239 }
 240
 241 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 242 {
 243         if (rev->shown_one) {
 244                 rev->shown_one = 0;
 245                 if (rev->commit_format != CMIT_FMT_ONELINE)
 246                         putchar(rev->diffopt.line_termination);
 247         }
 248         fprintf(rev->diffopt.file, _("Final output: %d %s\n"), nr, stage);
 249 }
 250
 251 static struct itimerval early_output_timer;
 252
 253 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 254 {
 255         int i = revs->early_output, close_file = revs->diffopt.close_file;
 256         int show_header = 1;
 257
 258         revs->diffopt.close_file = 0;
 259         sort_in_topological_order(&list, revs->sort_order);
 260         while (list && i) {
 261                 struct commit *commit = list->item;
 262                 switch (simplify_commit(revs, commit)) {
 263                 case commit_show:
 264                         if (show_header) {
 265                                 int n = estimate_commit_count(revs, list);
 266                                 show_early_header(revs, "incomplete", n);
 267                                 show_header = 0;
 268                         }
 269                         log_tree_commit(revs, commit);
 270                         i--;
 271                         break;
 272                 case commit_ignore:
 273                         break;
 274                 case commit_error:
 275                         if (close_file)
 276                                 fclose(revs->diffopt.file);
 277                         return;
 278                 }
 279                 list = list->next;
 280         }
 281
 282         /* Did we already get enough commits for the early output? */
 283         if (!i) {
 284                 if (close_file)
 285                         fclose(revs->diffopt.file);
 286                 return;
 287         }
 288
 289         /*
 290          * ..if no, then repeat it twice a second until we
 291          * do.
 292          *
 293          * NOTE! We don't use "it_interval", because if the
 294          * reader isn't listening, we want our output to be
 295          * throttled by the writing, and not have the timer
 296          * trigger every second even if we're blocked on a
 297          * reader!
 298          */
 299         early_output_timer.it_value.tv_sec = 0;
 300         early_output_timer.it_value.tv_usec = 500000;
 301         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 302 }
 303
 304 static void early_output(int signal)
 305 {
 306         show_early_output = log_show_early;
 307 }
 308
 309 static void setup_early_output(struct rev_info *rev)
 310 {
 311         struct sigaction sa;
 312
 313         /*
 314          * Set up the signal handler, minimally intrusively:
 315          * we only set a single volatile integer word (not
 316          * using sigatomic_t - trying to avoid unnecessary
 317          * system dependencies and headers), and using
 318          * SA_RESTART.
 319          */
 320         memset(&sa, 0, sizeof(sa));
 321         sa.sa_handler = early_output;
 322         sigemptyset(&sa.sa_mask);
 323         sa.sa_flags = SA_RESTART;
 324         sigaction(SIGALRM, &sa, NULL);
 325
 326         /*
 327          * If we can get the whole output in less than a
 328          * tenth of a second, don't even bother doing the
 329          * early-output thing..
 330          *
 331          * This is a one-time-only trigger.
 332          */
 333         early_output_timer.it_value.tv_sec = 0;
 334         early_output_timer.it_value.tv_usec = 100000;
 335         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 336 }
 337
 338 static void finish_early_output(struct rev_info *rev)
 339 {
 340         int n = estimate_commit_count(rev, rev->commits);
 341         signal(SIGALRM, SIG_IGN);
 342         show_early_header(rev, "done", n);
 343 }
 344
 345 static int cmd_log_walk(struct rev_info *rev)
 346 {
 347         struct commit *commit;
 348         int saved_nrl = 0;
 349         int saved_dcctc = 0, close_file = rev->diffopt.close_file;
 350
 351         if (rev->early_output)
 352                 setup_early_output(rev);
 353
 354         if (prepare_revision_walk(rev))
 355                 die(_("revision walk setup failed"));
 356
 357         if (rev->early_output)
 358                 finish_early_output(rev);
 359
 360         /*
 361          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 362          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 363          * retain that state information if replacing rev->diffopt in this loop
 364          */
 365         rev->diffopt.close_file = 0;
 366         while ((commit = get_revision(rev)) != NULL) {
 367                 if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
 368                         /*
 369                          * We decremented max_count in get_revision,
 370                          * but we didn't actually show the commit.
 371                          */
 372                         rev->max_count++;
 373                 if (!rev->reflog_info) {
 374                         /* we allow cycles in reflog ancestry */
 375                         free_commit_buffer(commit);
 376                 }
 377                 free_commit_list(commit->parents);
 378                 commit->parents = NULL;
 379                 if (saved_nrl < rev->diffopt.needed_rename_limit)
 380                         saved_nrl = rev->diffopt.needed_rename_limit;
 381                 if (rev->diffopt.degraded_cc_to_c)
 382                         saved_dcctc = 1;
 383         }
 384         rev->diffopt.degraded_cc_to_c = saved_dcctc;
 385         rev->diffopt.needed_rename_limit = saved_nrl;
 386         if (close_file)
 387                 fclose(rev->diffopt.file);
 388
 389         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 390             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 391                 return 02;
 392         }
 393         return diff_result_code(&rev->diffopt, 0);
 394 }
 395
 396 static int git_log_config(const char *var, const char *value, void *cb)
 397 {
 398         const char *slot_name;
 399
 400         if (!strcmp(var, "format.pretty"))
 401                 return git_config_string(&fmt_pretty, var, value);
 402         if (!strcmp(var, "format.subjectprefix"))
 403                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 404         if (!strcmp(var, "log.abbrevcommit")) {
 405                 default_abbrev_commit = git_config_bool(var, value);
 406                 return 0;
 407         }
 408         if (!strcmp(var, "log.date"))
 409                 return git_config_string(&default_date_mode, var, value);
 410         if (!strcmp(var, "log.decorate")) {
 411                 decoration_style = parse_decoration_style(var, value);
 412                 if (decoration_style < 0)
 413                         decoration_style = 0; /* maybe warn? */
 414                 return 0;
 415         }
 416         if (!strcmp(var, "log.showroot")) {
 417                 default_show_root = git_config_bool(var, value);
 418                 return 0;
 419         }
 420         if (!strcmp(var, "log.follow")) {
 421                 default_follow = git_config_bool(var, value);
 422                 return 0;
 423         }
 424         if (skip_prefix(var, "color.decorate.", &slot_name))
 425                 return parse_decorate_color_config(var, slot_name, value);
 426         if (!strcmp(var, "log.mailmap")) {
 427                 use_mailmap_config = git_config_bool(var, value);
 428                 return 0;
 429         }
 430         if (!strcmp(var, "log.showsignature")) {
 431                 default_show_signature = git_config_bool(var, value);
 432                 return 0;
 433         }
 434
 435         if (grep_config(var, value, cb) < 0)
 436                 return -1;
 437         if (git_gpg_config(var, value, cb) < 0)
 438                 return -1;
 439         return git_diff_ui_config(var, value, cb);
 440 }
 441
 442 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 443 {
 444         struct rev_info rev;
 445         struct setup_revision_opt opt;
 446
 447         init_log_defaults();
 448         git_config(git_log_config, NULL);
 449
 450         init_revisions(&rev, prefix);
 451         rev.diff = 1;
 452         rev.simplify_history = 0;
 453         memset(&opt, 0, sizeof(opt));
 454         opt.def = "HEAD";
 455         opt.revarg_opt = REVARG_COMMITTISH;
 456         cmd_log_init(argc, argv, prefix, &rev, &opt);
 457         if (!rev.diffopt.output_format)
 458                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 459         return cmd_log_walk(&rev);
 460 }
 461
 462 static void show_tagger(char *buf, int len, struct rev_info *rev)
 463 {
 464         struct strbuf out = STRBUF_INIT;
 465         struct pretty_print_context pp = {0};
 466
 467         pp.fmt = rev->commit_format;
 468         pp.date_mode = rev->date_mode;
 469         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
 470         fprintf(rev->diffopt.file, "%s", out.buf);
 471         strbuf_release(&out);
 472 }
 473
 474 static int show_blob_object(const struct object_id *oid, struct rev_info *rev, const char *obj_name)
 475 {
 476         struct object_id oidc;
 477         struct object_context obj_context;
 478         char *buf;
 479         unsigned long size;
 480
 481         fflush(rev->diffopt.file);
 482         if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
 483             !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
 484                 return stream_blob_to_fd(1, oid, NULL, 0);
 485
 486         if (get_sha1_with_context(obj_name, GET_SHA1_RECORD_PATH,
 487                                   oidc.hash, &obj_context))
 488                 die(_("Not a valid object name %s"), obj_name);
 489         if (!obj_context.path ||
 490             !textconv_object(obj_context.path, obj_context.mode, &oidc, 1, &buf, &size)) {
 491                 free(obj_context.path);
 492                 return stream_blob_to_fd(1, oid, NULL, 0);
 493         }
 494
 495         if (!buf)
 496                 die(_("git show %s: bad file"), obj_name);
 497
 498         write_or_die(1, buf, size);
 499         free(obj_context.path);
 500         return 0;
 501 }
 502
 503 static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 504 {
 505         unsigned long size;
 506         enum object_type type;
 507         char *buf = read_sha1_file(oid->hash, &type, &size);
 508         int offset = 0;
 509
 510         if (!buf)
 511                 return error(_("Could not read object %s"), oid_to_hex(oid));
 512
 513         assert(type == OBJ_TAG);
 514         while (offset < size && buf[offset] != '\n') {
 515                 int new_offset = offset + 1;
 516                 while (new_offset < size && buf[new_offset++] != '\n')
 517                         ; /* do nothing */
 518                 if (starts_with(buf + offset, "tagger "))
 519                         show_tagger(buf + offset + 7,
 520                                     new_offset - offset - 7, rev);
 521                 offset = new_offset;
 522         }
 523
 524         if (offset < size)
 525                 fwrite(buf + offset, size - offset, 1, rev->diffopt.file);
 526         free(buf);
 527         return 0;
 528 }
 529
 530 static int show_tree_object(const unsigned char *sha1,
 531                 struct strbuf *base,
 532                 const char *pathname, unsigned mode, int stage, void *context)
 533 {
 534         FILE *file = context;
 535         fprintf(file, "%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 536         return 0;
 537 }
 538
 539 static void show_setup_revisions_tweak(struct rev_info *rev,
 540                                        struct setup_revision_opt *opt)
 541 {
 542         if (rev->ignore_merges) {
 543                 /* There was no "-m" on the command line */
 544                 rev->ignore_merges = 0;
 545                 if (!rev->first_parent_only && !rev->combine_merges) {
 546                         /* No "--first-parent", "-c", or "--cc" */
 547                         rev->combine_merges = 1;
 548                         rev->dense_combined_merges = 1;
 549                 }
 550         }
 551         if (!rev->diffopt.output_format)
 552                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 553 }
 554
 555 int cmd_show(int argc, const char **argv, const char *prefix)
 556 {
 557         struct rev_info rev;
 558         struct object_array_entry *objects;
 559         struct setup_revision_opt opt;
 560         struct pathspec match_all;
 561         int i, count, ret = 0;
 562
 563         init_log_defaults();
 564         git_config(git_log_config, NULL);
 565
 566         memset(&match_all, 0, sizeof(match_all));
 567         init_revisions(&rev, prefix);
 568         rev.diff = 1;
 569         rev.always_show_header = 1;
 570         rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
 571         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
 572
 573         memset(&opt, 0, sizeof(opt));
 574         opt.def = "HEAD";
 575         opt.tweak = show_setup_revisions_tweak;
 576         cmd_log_init(argc, argv, prefix, &rev, &opt);
 577
 578         if (!rev.no_walk)
 579                 return cmd_log_walk(&rev);
 580
 581         count = rev.pending.nr;
 582         objects = rev.pending.objects;
 583         for (i = 0; i < count && !ret; i++) {
 584                 struct object *o = objects[i].item;
 585                 const char *name = objects[i].name;
 586                 switch (o->type) {
 587                 case OBJ_BLOB:
 588                         ret = show_blob_object(&o->oid, &rev, name);
 589                         break;
 590                 case OBJ_TAG: {
 591                         struct tag *t = (struct tag *)o;
 592
 593                         if (rev.shown_one)
 594                                 putchar('\n');
 595                         fprintf(rev.diffopt.file, "%stag %s%s\n",
 596                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 597                                         t->tag,
 598                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 599                         ret = show_tag_object(&o->oid, &rev);
 600                         rev.shown_one = 1;
 601                         if (ret)
 602                                 break;
 603                         o = parse_object(&t->tagged->oid);
 604                         if (!o)
 605                                 ret = error(_("Could not read object %s"),
 606                                             oid_to_hex(&t->tagged->oid));
 607                         objects[i].item = o;
 608                         i--;
 609                         break;
 610                 }
 611                 case OBJ_TREE:
 612                         if (rev.shown_one)
 613                                 putchar('\n');
 614                         fprintf(rev.diffopt.file, "%stree %s%s\n\n",
 615                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 616                                         name,
 617                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 618                         read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
 619                                         show_tree_object, rev.diffopt.file);
 620                         rev.shown_one = 1;
 621                         break;
 622                 case OBJ_COMMIT:
 623                         rev.pending.nr = rev.pending.alloc = 0;
 624                         rev.pending.objects = NULL;
 625                         add_object_array(o, name, &rev.pending);
 626                         ret = cmd_log_walk(&rev);
 627                         break;
 628                 default:
 629                         ret = error(_("Unknown type: %d"), o->type);
 630                 }
 631         }
 632         free(objects);
 633         return ret;
 634 }
 635
 636 /*
 637  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 638  */
 639 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 640 {
 641         struct rev_info rev;
 642         struct setup_revision_opt opt;
 643
 644         init_log_defaults();
 645         git_config(git_log_config, NULL);
 646
 647         init_revisions(&rev, prefix);
 648         init_reflog_walk(&rev.reflog_info);
 649         rev.verbose_header = 1;
 650         memset(&opt, 0, sizeof(opt));
 651         opt.def = "HEAD";
 652         cmd_log_init_defaults(&rev);
 653         rev.abbrev_commit = 1;
 654         rev.commit_format = CMIT_FMT_ONELINE;
 655         rev.use_terminator = 1;
 656         rev.always_show_header = 1;
 657         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
 658
 659         return cmd_log_walk(&rev);
 660 }
 661
 662 static void log_setup_revisions_tweak(struct rev_info *rev,
 663                                       struct setup_revision_opt *opt)
 664 {
 665         if (DIFF_OPT_TST(&rev->diffopt, DEFAULT_FOLLOW_RENAMES) &&
 666             rev->prune_data.nr == 1)
 667                 DIFF_OPT_SET(&rev->diffopt, FOLLOW_RENAMES);
 668
 669         /* Turn --cc/-c into -p --cc/-c when -p was not given */
 670         if (!rev->diffopt.output_format && rev->combine_merges)
 671                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 672
 673         /* Turn -m on when --cc/-c was given */
 674         if (rev->combine_merges)
 675                 rev->ignore_merges = 0;
 676 }
 677
 678 int cmd_log(int argc, const char **argv, const char *prefix)
 679 {
 680         struct rev_info rev;
 681         struct setup_revision_opt opt;
 682
 683         init_log_defaults();
 684         git_config(git_log_config, NULL);
 685
 686         init_revisions(&rev, prefix);
 687         rev.always_show_header = 1;
 688         memset(&opt, 0, sizeof(opt));
 689         opt.def = "HEAD";
 690         opt.revarg_opt = REVARG_COMMITTISH;
 691         opt.tweak = log_setup_revisions_tweak;
 692         cmd_log_init(argc, argv, prefix, &rev, &opt);
 693         return cmd_log_walk(&rev);
 694 }
 695
 696 /* format-patch */
 697
 698 static const char *fmt_patch_suffix = ".patch";
 699 static int numbered = 0;
 700 static int auto_number = 1;
 701
 702 static char *default_attach = NULL;
 703
 704 static struct string_list extra_hdr = STRING_LIST_INIT_NODUP;
 705 static struct string_list extra_to = STRING_LIST_INIT_NODUP;
 706 static struct string_list extra_cc = STRING_LIST_INIT_NODUP;
 707
 708 static void add_header(const char *value)
 709 {
 710         struct string_list_item *item;
 711         int len = strlen(value);
 712         while (len && value[len - 1] == '\n')
 713                 len--;
 714
 715         if (!strncasecmp(value, "to: ", 4)) {
 716                 item = string_list_append(&extra_to, value + 4);
 717                 len -= 4;
 718         } else if (!strncasecmp(value, "cc: ", 4)) {
 719                 item = string_list_append(&extra_cc, value + 4);
 720                 len -= 4;
 721         } else {
 722                 item = string_list_append(&extra_hdr, value);
 723         }
 724
 725         item->string[len] = '\0';
 726 }
 727
 728 #define THREAD_SHALLOW 1
 729 #define THREAD_DEEP 2
 730 static int thread;
 731 static int do_signoff;
 732 static int base_auto;
 733 static char *from;
 734 static const char *signature = git_version_string;
 735 static const char *signature_file;
 736 static int config_cover_letter;
 737 static const char *config_output_directory;
 738
 739 enum {
 740         COVER_UNSET,
 741         COVER_OFF,
 742         COVER_ON,
 743         COVER_AUTO
 744 };
 745
 746 static int git_format_config(const char *var, const char *value, void *cb)
 747 {
 748         if (!strcmp(var, "format.headers")) {
 749                 if (!value)
 750                         die(_("format.headers without value"));
 751                 add_header(value);
 752                 return 0;
 753         }
 754         if (!strcmp(var, "format.suffix"))
 755                 return git_config_string(&fmt_patch_suffix, var, value);
 756         if (!strcmp(var, "format.to")) {
 757                 if (!value)
 758                         return config_error_nonbool(var);
 759                 string_list_append(&extra_to, value);
 760                 return 0;
 761         }
 762         if (!strcmp(var, "format.cc")) {
 763                 if (!value)
 764                         return config_error_nonbool(var);
 765                 string_list_append(&extra_cc, value);
 766                 return 0;
 767         }
 768         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 769             !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
 770                 return 0;
 771         }
 772         if (!strcmp(var, "format.numbered")) {
 773                 if (value && !strcasecmp(value, "auto")) {
 774                         auto_number = 1;
 775                         return 0;
 776                 }
 777                 numbered = git_config_bool(var, value);
 778                 auto_number = auto_number && numbered;
 779                 return 0;
 780         }
 781         if (!strcmp(var, "format.attach")) {
 782                 if (value && *value)
 783                         default_attach = xstrdup(value);
 784                 else
 785                         default_attach = xstrdup(git_version_string);
 786                 return 0;
 787         }
 788         if (!strcmp(var, "format.thread")) {
 789                 if (value && !strcasecmp(value, "deep")) {
 790                         thread = THREAD_DEEP;
 791                         return 0;
 792                 }
 793                 if (value && !strcasecmp(value, "shallow")) {
 794                         thread = THREAD_SHALLOW;
 795                         return 0;
 796                 }
 797                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 798                 return 0;
 799         }
 800         if (!strcmp(var, "format.signoff")) {
 801                 do_signoff = git_config_bool(var, value);
 802                 return 0;
 803         }
 804         if (!strcmp(var, "format.signature"))
 805                 return git_config_string(&signature, var, value);
 806         if (!strcmp(var, "format.signaturefile"))
 807                 return git_config_pathname(&signature_file, var, value);
 808         if (!strcmp(var, "format.coverletter")) {
 809                 if (value && !strcasecmp(value, "auto")) {
 810                         config_cover_letter = COVER_AUTO;
 811                         return 0;
 812                 }
 813                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
 814                 return 0;
 815         }
 816         if (!strcmp(var, "format.outputdirectory"))
 817                 return git_config_string(&config_output_directory, var, value);
 818         if (!strcmp(var, "format.useautobase")) {
 819                 base_auto = git_config_bool(var, value);
 820                 return 0;
 821         }
 822         if (!strcmp(var, "format.from")) {
 823                 int b = git_config_maybe_bool(var, value);
 824                 free(from);
 825                 if (b < 0)
 826                         from = xstrdup(value);
 827                 else if (b)
 828                         from = xstrdup(git_committer_info(IDENT_NO_DATE));
 829                 else
 830                         from = NULL;
 831                 return 0;
 832         }
 833
 834         return git_log_config(var, value, cb);
 835 }
 836
 837 static const char *output_directory = NULL;
 838 static int outdir_offset;
 839
 840 static int open_next_file(struct commit *commit, const char *subject,
 841                          struct rev_info *rev, int quiet)
 842 {
 843         struct strbuf filename = STRBUF_INIT;
 844         int suffix_len = strlen(rev->patch_suffix) + 1;
 845
 846         if (output_directory) {
 847                 strbuf_addstr(&filename, output_directory);
 848                 if (filename.len >=
 849                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 850                         return error(_("name of output directory is too long"));
 851                 strbuf_complete(&filename, '/');
 852         }
 853
 854         if (rev->numbered_files)
 855                 strbuf_addf(&filename, "%d", rev->nr);
 856         else if (commit)
 857                 fmt_output_commit(&filename, commit, rev);
 858         else
 859                 fmt_output_subject(&filename, subject, rev);
 860
 861         if (!quiet)
 862                 printf("%s\n", filename.buf + outdir_offset);
 863
 864         if ((rev->diffopt.file = fopen(filename.buf, "w")) == NULL)
 865                 return error(_("Cannot open patch file %s"), filename.buf);
 866
 867         strbuf_release(&filename);
 868         return 0;
 869 }
 870
 871 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 872 {
 873         struct rev_info check_rev;
 874         struct commit *commit, *c1, *c2;
 875         struct object *o1, *o2;
 876         unsigned flags1, flags2;
 877
 878         if (rev->pending.nr != 2)
 879                 die(_("Need exactly one range."));
 880
 881         o1 = rev->pending.objects[0].item;
 882         o2 = rev->pending.objects[1].item;
 883         flags1 = o1->flags;
 884         flags2 = o2->flags;
 885         c1 = lookup_commit_reference(&o1->oid);
 886         c2 = lookup_commit_reference(&o2->oid);
 887
 888         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 889                 die(_("Not a range."));
 890
 891         init_patch_ids(ids);
 892
 893         /* given a range a..b get all patch ids for b..a */
 894         init_revisions(&check_rev, rev->prefix);
 895         check_rev.max_parents = 1;
 896         o1->flags ^= UNINTERESTING;
 897         o2->flags ^= UNINTERESTING;
 898         add_pending_object(&check_rev, o1, "o1");
 899         add_pending_object(&check_rev, o2, "o2");
 900         if (prepare_revision_walk(&check_rev))
 901                 die(_("revision walk setup failed"));
 902
 903         while ((commit = get_revision(&check_rev)) != NULL) {
 904                 add_commit_patch_id(commit, ids);
 905         }
 906
 907         /* reset for next revision walk */
 908         clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
 909         clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
 910         o1->flags = flags1;
 911         o2->flags = flags2;
 912 }
 913
 914 static void gen_message_id(struct rev_info *info, char *base)
 915 {
 916         struct strbuf buf = STRBUF_INIT;
 917         strbuf_addf(&buf, "%s.%"PRItime".git.%s", base,
 918                     (timestamp_t) time(NULL),
 919                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 920         info->message_id = strbuf_detach(&buf, NULL);
 921 }
 922
 923 static void print_signature(FILE *file)
 924 {
 925         if (!signature || !*signature)
 926                 return;
 927
 928         fprintf(file, "-- \n%s", signature);
 929         if (signature[strlen(signature)-1] != '\n')
 930                 putc('\n', file);
 931         putc('\n', file);
 932 }
 933
 934 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 935 {
 936         struct strbuf desc = STRBUF_INIT;
 937         if (!branch_name || !*branch_name)
 938                 return;
 939         read_branch_desc(&desc, branch_name);
 940         if (desc.len) {
 941                 strbuf_addch(buf, '\n');
 942                 strbuf_addbuf(buf, &desc);
 943                 strbuf_addch(buf, '\n');
 944         }
 945         strbuf_release(&desc);
 946 }
 947
 948 static char *find_branch_name(struct rev_info *rev)
 949 {
 950         int i, positive = -1;
 951         struct object_id branch_oid;
 952         const struct object_id *tip_oid;
 953         const char *ref, *v;
 954         char *full_ref, *branch = NULL;
 955
 956         for (i = 0; i < rev->cmdline.nr; i++) {
 957                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
 958                         continue;
 959                 if (positive < 0)
 960                         positive = i;
 961                 else
 962                         return NULL;
 963         }
 964         if (positive < 0)
 965                 return NULL;
 966         ref = rev->cmdline.rev[positive].name;
 967         tip_oid = &rev->cmdline.rev[positive].item->oid;
 968         if (dwim_ref(ref, strlen(ref), branch_oid.hash, &full_ref) &&
 969             skip_prefix(full_ref, "refs/heads/", &v) &&
 970             !oidcmp(tip_oid, &branch_oid))
 971                 branch = xstrdup(v);
 972         free(full_ref);
 973         return branch;
 974 }
 975
 976 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 977                               struct commit *origin,
 978                               int nr, struct commit **list,
 979                               const char *branch_name,
 980                               int quiet)
 981 {
 982         const char *committer;
 983         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 984         const char *msg;
 985         struct shortlog log;
 986         struct strbuf sb = STRBUF_INIT;
 987         int i;
 988         const char *encoding = "UTF-8";
 989         struct diff_options opts;
 990         int need_8bit_cte = 0;
 991         struct pretty_print_context pp = {0};
 992         struct commit *head = list[0];
 993
 994         if (!cmit_fmt_is_mail(rev->commit_format))
 995                 die(_("Cover letter needs email format"));
 996
 997         committer = git_committer_info(0);
 998
 999         if (!use_stdout &&
1000             open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
1001                 return;
1002
1003         log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte);
1004
1005         for (i = 0; !need_8bit_cte && i < nr; i++) {
1006                 const char *buf = get_commit_buffer(list[i], NULL);
1007                 if (has_non_ascii(buf))
1008                         need_8bit_cte = 1;
1009                 unuse_commit_buffer(list[i], buf);
1010         }
1011
1012         if (!branch_name)
1013                 branch_name = find_branch_name(rev);
1014
1015         msg = body;
1016         pp.fmt = CMIT_FMT_EMAIL;
1017         pp.date_mode.type = DATE_RFC2822;
1018         pp.rev = rev;
1019         pp.print_email_subject = 1;
1020         pp_user_info(&pp, NULL, &sb, committer, encoding);
1021         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
1022         pp_remainder(&pp, &msg, &sb, 0);
1023         add_branch_description(&sb, branch_name);
1024         fprintf(rev->diffopt.file, "%s\n", sb.buf);
1025
1026         strbuf_release(&sb);
1027
1028         shortlog_init(&log);
1029         log.wrap_lines = 1;
1030         log.wrap = 72;
1031         log.in1 = 2;
1032         log.in2 = 4;
1033         log.file = rev->diffopt.file;
1034         for (i = 0; i < nr; i++)
1035                 shortlog_add_commit(&log, list[i]);
1036
1037         shortlog_output(&log);
1038
1039         /*
1040          * We can only do diffstat with a unique reference point
1041          */
1042         if (!origin)
1043                 return;
1044
1045         memcpy(&opts, &rev->diffopt, sizeof(opts));
1046         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1047
1048         diff_setup_done(&opts);
1049
1050         diff_tree_sha1(origin->tree->object.oid.hash,
1051                        head->tree->object.oid.hash,
1052                        "", &opts);
1053         diffcore_std(&opts);
1054         diff_flush(&opts);
1055
1056         fprintf(rev->diffopt.file, "\n");
1057 }
1058
1059 static const char *clean_message_id(const char *msg_id)
1060 {
1061         char ch;
1062         const char *a, *z, *m;
1063
1064         m = msg_id;
1065         while ((ch = *m) && (isspace(ch) || (ch == '<')))
1066                 m++;
1067         a = m;
1068         z = NULL;
1069         while ((ch = *m)) {
1070                 if (!isspace(ch) && (ch != '>'))
1071                         z = m;
1072                 m++;
1073         }
1074         if (!z)
1075                 die(_("insane in-reply-to: %s"), msg_id);
1076         if (++z == m)
1077                 return a;
1078         return xmemdupz(a, z - a);
1079 }
1080
1081 static const char *set_outdir(const char *prefix, const char *output_directory)
1082 {
1083         if (output_directory && is_absolute_path(output_directory))
1084                 return output_directory;
1085
1086         if (!prefix || !*prefix) {
1087                 if (output_directory)
1088                         return output_directory;
1089                 /* The user did not explicitly ask for "./" */
1090                 outdir_offset = 2;
1091                 return "./";
1092         }
1093
1094         outdir_offset = strlen(prefix);
1095         if (!output_directory)
1096                 return prefix;
1097
1098         return prefix_filename(prefix, output_directory);
1099 }
1100
1101 static const char * const builtin_format_patch_usage[] = {
1102         N_("git format-patch [<options>] [<since> | <revision-range>]"),
1103         NULL
1104 };
1105
1106 static int keep_subject = 0;
1107
1108 static int keep_callback(const struct option *opt, const char *arg, int unset)
1109 {
1110         ((struct rev_info *)opt->value)->total = -1;
1111         keep_subject = 1;
1112         return 0;
1113 }
1114
1115 static int subject_prefix = 0;
1116
1117 static int subject_prefix_callback(const struct option *opt, const char *arg,
1118                             int unset)
1119 {
1120         subject_prefix = 1;
1121         ((struct rev_info *)opt->value)->subject_prefix = arg;
1122         return 0;
1123 }
1124
1125 static int rfc_callback(const struct option *opt, const char *arg, int unset)
1126 {
1127         return subject_prefix_callback(opt, "RFC PATCH", unset);
1128 }
1129
1130 static int numbered_cmdline_opt = 0;
1131
1132 static int numbered_callback(const struct option *opt, const char *arg,
1133                              int unset)
1134 {
1135         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1136         if (unset)
1137                 auto_number =  0;
1138         return 0;
1139 }
1140
1141 static int no_numbered_callback(const struct option *opt, const char *arg,
1142                                 int unset)
1143 {
1144         return numbered_callback(opt, arg, 1);
1145 }
1146
1147 static int output_directory_callback(const struct option *opt, const char *arg,
1148                               int unset)
1149 {
1150         const char **dir = (const char **)opt->value;
1151         if (*dir)
1152                 die(_("Two output directories?"));
1153         *dir = arg;
1154         return 0;
1155 }
1156
1157 static int thread_callback(const struct option *opt, const char *arg, int unset)
1158 {
1159         int *thread = (int *)opt->value;
1160         if (unset)
1161                 *thread = 0;
1162         else if (!arg || !strcmp(arg, "shallow"))
1163                 *thread = THREAD_SHALLOW;
1164         else if (!strcmp(arg, "deep"))
1165                 *thread = THREAD_DEEP;
1166         else
1167                 return 1;
1168         return 0;
1169 }
1170
1171 static int attach_callback(const struct option *opt, const char *arg, int unset)
1172 {
1173         struct rev_info *rev = (struct rev_info *)opt->value;
1174         if (unset)
1175                 rev->mime_boundary = NULL;
1176         else if (arg)
1177                 rev->mime_boundary = arg;
1178         else
1179                 rev->mime_boundary = git_version_string;
1180         rev->no_inline = unset ? 0 : 1;
1181         return 0;
1182 }
1183
1184 static int inline_callback(const struct option *opt, const char *arg, int unset)
1185 {
1186         struct rev_info *rev = (struct rev_info *)opt->value;
1187         if (unset)
1188                 rev->mime_boundary = NULL;
1189         else if (arg)
1190                 rev->mime_boundary = arg;
1191         else
1192                 rev->mime_boundary = git_version_string;
1193         rev->no_inline = 0;
1194         return 0;
1195 }
1196
1197 static int header_callback(const struct option *opt, const char *arg, int unset)
1198 {
1199         if (unset) {
1200                 string_list_clear(&extra_hdr, 0);
1201                 string_list_clear(&extra_to, 0);
1202                 string_list_clear(&extra_cc, 0);
1203         } else {
1204             add_header(arg);
1205         }
1206         return 0;
1207 }
1208
1209 static int to_callback(const struct option *opt, const char *arg, int unset)
1210 {
1211         if (unset)
1212                 string_list_clear(&extra_to, 0);
1213         else
1214                 string_list_append(&extra_to, arg);
1215         return 0;
1216 }
1217
1218 static int cc_callback(const struct option *opt, const char *arg, int unset)
1219 {
1220         if (unset)
1221                 string_list_clear(&extra_cc, 0);
1222         else
1223                 string_list_append(&extra_cc, arg);
1224         return 0;
1225 }
1226
1227 static int from_callback(const struct option *opt, const char *arg, int unset)
1228 {
1229         char **from = opt->value;
1230
1231         free(*from);
1232
1233         if (unset)
1234                 *from = NULL;
1235         else if (arg)
1236                 *from = xstrdup(arg);
1237         else
1238                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1239         return 0;
1240 }
1241
1242 struct base_tree_info {
1243         struct object_id base_commit;
1244         int nr_patch_id, alloc_patch_id;
1245         struct object_id *patch_id;
1246 };
1247
1248 static struct commit *get_base_commit(const char *base_commit,
1249                                       struct commit **list,
1250                                       int total)
1251 {
1252         struct commit *base = NULL;
1253         struct commit **rev;
1254         int i = 0, rev_nr = 0;
1255
1256         if (base_commit && strcmp(base_commit, "auto")) {
1257                 base = lookup_commit_reference_by_name(base_commit);
1258                 if (!base)
1259                         die(_("Unknown commit %s"), base_commit);
1260         } else if ((base_commit && !strcmp(base_commit, "auto")) || base_auto) {
1261                 struct branch *curr_branch = branch_get(NULL);
1262                 const char *upstream = branch_get_upstream(curr_branch, NULL);
1263                 if (upstream) {
1264                         struct commit_list *base_list;
1265                         struct commit *commit;
1266                         struct object_id oid;
1267
1268                         if (get_oid(upstream, &oid))
1269                                 die(_("Failed to resolve '%s' as a valid ref."), upstream);
1270                         commit = lookup_commit_or_die(&oid, "upstream base");
1271                         base_list = get_merge_bases_many(commit, total, list);
1272                         /* There should be one and only one merge base. */
1273                         if (!base_list || base_list->next)
1274                                 die(_("Could not find exact merge base."));
1275                         base = base_list->item;
1276                         free_commit_list(base_list);
1277                 } else {
1278                         die(_("Failed to get upstream, if you want to record base commit automatically,\n"
1279                               "please use git branch --set-upstream-to to track a remote branch.\n"
1280                               "Or you could specify base commit by --base=<base-commit-id> manually."));
1281                 }
1282         }
1283
1284         ALLOC_ARRAY(rev, total);
1285         for (i = 0; i < total; i++)
1286                 rev[i] = list[i];
1287
1288         rev_nr = total;
1289         /*
1290          * Get merge base through pair-wise computations
1291          * and store it in rev[0].
1292          */
1293         while (rev_nr > 1) {
1294                 for (i = 0; i < rev_nr / 2; i++) {
1295                         struct commit_list *merge_base;
1296                         merge_base = get_merge_bases(rev[2 * i], rev[2 * i + 1]);
1297                         if (!merge_base || merge_base->next)
1298                                 die(_("Failed to find exact merge base"));
1299
1300                         rev[i] = merge_base->item;
1301                 }
1302
1303                 if (rev_nr % 2)
1304                         rev[i] = rev[2 * i];
1305                 rev_nr = (rev_nr + 1) / 2;
1306         }
1307
1308         if (!in_merge_bases(base, rev[0]))
1309                 die(_("base commit should be the ancestor of revision list"));
1310
1311         for (i = 0; i < total; i++) {
1312                 if (base == list[i])
1313                         die(_("base commit shouldn't be in revision list"));
1314         }
1315
1316         free(rev);
1317         return base;
1318 }
1319
1320 static void prepare_bases(struct base_tree_info *bases,
1321                           struct commit *base,
1322                           struct commit **list,
1323                           int total)
1324 {
1325         struct commit *commit;
1326         struct rev_info revs;
1327         struct diff_options diffopt;
1328         int i;
1329
1330         if (!base)
1331                 return;
1332
1333         diff_setup(&diffopt);
1334         DIFF_OPT_SET(&diffopt, RECURSIVE);
1335         diff_setup_done(&diffopt);
1336
1337         oidcpy(&bases->base_commit, &base->object.oid);
1338
1339         init_revisions(&revs, NULL);
1340         revs.max_parents = 1;
1341         revs.topo_order = 1;
1342         for (i = 0; i < total; i++) {
1343                 list[i]->object.flags &= ~UNINTERESTING;
1344                 add_pending_object(&revs, &list[i]->object, "rev_list");
1345                 list[i]->util = (void *)1;
1346         }
1347         base->object.flags |= UNINTERESTING;
1348         add_pending_object(&revs, &base->object, "base");
1349
1350         if (prepare_revision_walk(&revs))
1351                 die(_("revision walk setup failed"));
1352         /*
1353          * Traverse the commits list, get prerequisite patch ids
1354          * and stuff them in bases structure.
1355          */
1356         while ((commit = get_revision(&revs)) != NULL) {
1357                 struct object_id oid;
1358                 struct object_id *patch_id;
1359                 if (commit->util)
1360                         continue;
1361                 if (commit_patch_id(commit, &diffopt, oid.hash, 0))
1362                         die(_("cannot get patch id"));
1363                 ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
1364                 patch_id = bases->patch_id + bases->nr_patch_id;
1365                 oidcpy(patch_id, &oid);
1366                 bases->nr_patch_id++;
1367         }
1368 }
1369
1370 static void print_bases(struct base_tree_info *bases, FILE *file)
1371 {
1372         int i;
1373
1374         /* Only do this once, either for the cover or for the first one */
1375         if (is_null_oid(&bases->base_commit))
1376                 return;
1377
1378         /* Show the base commit */
1379         fprintf(file, "\nbase-commit: %s\n", oid_to_hex(&bases->base_commit));
1380
1381         /* Show the prerequisite patches */
1382         for (i = bases->nr_patch_id - 1; i >= 0; i--)
1383                 fprintf(file, "prerequisite-patch-id: %s\n", oid_to_hex(&bases->patch_id[i]));
1384
1385         free(bases->patch_id);
1386         bases->nr_patch_id = 0;
1387         bases->alloc_patch_id = 0;
1388         oidclr(&bases->base_commit);
1389 }
1390
1391 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1392 {
1393         struct commit *commit;
1394         struct commit **list = NULL;
1395         struct rev_info rev;
1396         struct setup_revision_opt s_r_opt;
1397         int nr = 0, total, i;
1398         int use_stdout = 0;
1399         int start_number = -1;
1400         int just_numbers = 0;
1401         int ignore_if_in_upstream = 0;
1402         int cover_letter = -1;
1403         int boundary_count = 0;
1404         int no_binary_diff = 0;
1405         int zero_commit = 0;
1406         struct commit *origin = NULL;
1407         const char *in_reply_to = NULL;
1408         struct patch_ids ids;
1409         struct strbuf buf = STRBUF_INIT;
1410         int use_patch_format = 0;
1411         int quiet = 0;
1412         int reroll_count = -1;
1413         char *branch_name = NULL;
1414         char *base_commit = NULL;
1415         struct base_tree_info bases;
1416
1417         const struct option builtin_format_patch_options[] = {
1418                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1419                             N_("use [PATCH n/m] even with a single patch"),
1420                             PARSE_OPT_NOARG, numbered_callback },
1421                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1422                             N_("use [PATCH] even with multiple patches"),
1423                             PARSE_OPT_NOARG, no_numbered_callback },
1424                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1425                 OPT_BOOL(0, "stdout", &use_stdout,
1426                             N_("print patches to standard out")),
1427                 OPT_BOOL(0, "cover-letter", &cover_letter,
1428                             N_("generate a cover letter")),
1429                 OPT_BOOL(0, "numbered-files", &just_numbers,
1430                             N_("use simple number sequence for output file names")),
1431                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1432                             N_("use <sfx> instead of '.patch'")),
1433                 OPT_INTEGER(0, "start-number", &start_number,
1434                             N_("start numbering patches at <n> instead of 1")),
1435                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1436                             N_("mark the series as Nth re-roll")),
1437                 { OPTION_CALLBACK, 0, "rfc", &rev, NULL,
1438                             N_("Use [RFC PATCH] instead of [PATCH]"),
1439                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, rfc_callback },
1440                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1441                             N_("Use [<prefix>] instead of [PATCH]"),
1442                             PARSE_OPT_NONEG, subject_prefix_callback },
1443                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1444                             N_("dir"), N_("store resulting files in <dir>"),
1445                             PARSE_OPT_NONEG, output_directory_callback },
1446                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1447                             N_("don't strip/add [PATCH]"),
1448                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1449                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1450                          N_("don't output binary diffs")),
1451                 OPT_BOOL(0, "zero-commit", &zero_commit,
1452                          N_("output all-zero hash in From header")),
1453                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1454                          N_("don't include a patch matching a commit upstream")),
1455                 { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
1456                   N_("show patch format instead of default (patch + stat)"),
1457                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
1458                 OPT_GROUP(N_("Messaging")),
1459                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1460                             N_("add email header"), 0, header_callback },
1461                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1462                             0, to_callback },
1463                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1464                             0, cc_callback },
1465                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1466                             N_("set From address to <ident> (or committer ident if absent)"),
1467                             PARSE_OPT_OPTARG, from_callback },
1468                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1469                             N_("make first mail a reply to <message-id>")),
1470                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1471                             N_("attach the patch"), PARSE_OPT_OPTARG,
1472                             attach_callback },
1473                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1474                             N_("inline the patch"),
1475                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1476                             inline_callback },
1477                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1478                             N_("enable message threading, styles: shallow, deep"),
1479                             PARSE_OPT_OPTARG, thread_callback },
1480                 OPT_STRING(0, "signature", &signature, N_("signature"),
1481                             N_("add a signature")),
1482                 OPT_STRING(0, "base", &base_commit, N_("base-commit"),
1483                            N_("add prerequisite tree info to the patch series")),
1484                 OPT_FILENAME(0, "signature-file", &signature_file,
1485                                 N_("add a signature from a file")),
1486                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1487                 OPT_END()
1488         };
1489
1490         extra_hdr.strdup_strings = 1;
1491         extra_to.strdup_strings = 1;
1492         extra_cc.strdup_strings = 1;
1493         init_log_defaults();
1494         git_config(git_format_config, NULL);
1495         init_revisions(&rev, prefix);
1496         rev.commit_format = CMIT_FMT_EMAIL;
1497         rev.expand_tabs_in_log_default = 0;
1498         rev.verbose_header = 1;
1499         rev.diff = 1;
1500         rev.max_parents = 1;
1501         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1502         rev.subject_prefix = fmt_patch_subject_prefix;
1503         memset(&s_r_opt, 0, sizeof(s_r_opt));
1504         s_r_opt.def = "HEAD";
1505         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1506
1507         if (default_attach) {
1508                 rev.mime_boundary = default_attach;
1509                 rev.no_inline = 1;
1510         }
1511
1512         /*
1513          * Parse the arguments before setup_revisions(), or something
1514          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1515          * possibly a valid SHA1.
1516          */
1517         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1518                              builtin_format_patch_usage,
1519                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1520                              PARSE_OPT_KEEP_DASHDASH);
1521
1522         if (0 < reroll_count) {
1523                 struct strbuf sprefix = STRBUF_INIT;
1524                 strbuf_addf(&sprefix, "%s v%d",
1525                             rev.subject_prefix, reroll_count);
1526                 rev.reroll_count = reroll_count;
1527                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1528         }
1529
1530         for (i = 0; i < extra_hdr.nr; i++) {
1531                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1532                 strbuf_addch(&buf, '\n');
1533         }
1534
1535         if (extra_to.nr)
1536                 strbuf_addstr(&buf, "To: ");
1537         for (i = 0; i < extra_to.nr; i++) {
1538                 if (i)
1539                         strbuf_addstr(&buf, "    ");
1540                 strbuf_addstr(&buf, extra_to.items[i].string);
1541                 if (i + 1 < extra_to.nr)
1542                         strbuf_addch(&buf, ',');
1543                 strbuf_addch(&buf, '\n');
1544         }
1545
1546         if (extra_cc.nr)
1547                 strbuf_addstr(&buf, "Cc: ");
1548         for (i = 0; i < extra_cc.nr; i++) {
1549                 if (i)
1550                         strbuf_addstr(&buf, "    ");
1551                 strbuf_addstr(&buf, extra_cc.items[i].string);
1552                 if (i + 1 < extra_cc.nr)
1553                         strbuf_addch(&buf, ',');
1554                 strbuf_addch(&buf, '\n');
1555         }
1556
1557         rev.extra_headers = strbuf_detach(&buf, NULL);
1558
1559         if (from) {
1560                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1561                         die(_("invalid ident line: %s"), from);
1562         }
1563
1564         if (start_number < 0)
1565                 start_number = 1;
1566
1567         /*
1568          * If numbered is set solely due to format.numbered in config,
1569          * and it would conflict with --keep-subject (-k) from the
1570          * command line, reset "numbered".
1571          */
1572         if (numbered && keep_subject && !numbered_cmdline_opt)
1573                 numbered = 0;
1574
1575         if (numbered && keep_subject)
1576                 die (_("-n and -k are mutually exclusive."));
1577         if (keep_subject && subject_prefix)
1578                 die (_("--subject-prefix/--rfc and -k are mutually exclusive."));
1579         rev.preserve_subject = keep_subject;
1580
1581         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1582         if (argc > 1)
1583                 die (_("unrecognized argument: %s"), argv[1]);
1584
1585         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1586                 die(_("--name-only does not make sense"));
1587         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1588                 die(_("--name-status does not make sense"));
1589         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1590                 die(_("--check does not make sense"));
1591
1592         if (!use_patch_format &&
1593                 (!rev.diffopt.output_format ||
1594                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1595                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1596
1597         /* Always generate a patch */
1598         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1599
1600         rev.zero_commit = zero_commit;
1601
1602         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1603                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1604
1605         if (rev.show_notes)
1606                 init_display_notes(&rev.notes_opt);
1607
1608         if (!output_directory && !use_stdout)
1609                 output_directory = config_output_directory;
1610
1611         if (!use_stdout)
1612                 output_directory = set_outdir(prefix, output_directory);
1613         else
1614                 setup_pager();
1615
1616         if (output_directory) {
1617                 if (rev.diffopt.use_color != GIT_COLOR_ALWAYS)
1618                         rev.diffopt.use_color = GIT_COLOR_NEVER;
1619                 if (use_stdout)
1620                         die(_("standard output, or directory, which one?"));
1621                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1622                         die_errno(_("Could not create directory '%s'"),
1623                                   output_directory);
1624         }
1625
1626         if (rev.pending.nr == 1) {
1627                 int check_head = 0;
1628
1629                 if (rev.max_count < 0 && !rev.show_root_diff) {
1630                         /*
1631                          * This is traditional behaviour of "git format-patch
1632                          * origin" that prepares what the origin side still
1633                          * does not have.
1634                          */
1635                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1636                         add_head_to_pending(&rev);
1637                         check_head = 1;
1638                 }
1639                 /*
1640                  * Otherwise, it is "format-patch -22 HEAD", and/or
1641                  * "format-patch --root HEAD".  The user wants
1642                  * get_revision() to do the usual traversal.
1643                  */
1644
1645                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1646                         check_head = 1;
1647
1648                 if (check_head) {
1649                         struct object_id oid;
1650                         const char *ref, *v;
1651                         ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1652                                                  oid.hash, NULL);
1653                         if (ref && skip_prefix(ref, "refs/heads/", &v))
1654                                 branch_name = xstrdup(v);
1655                         else
1656                                 branch_name = xstrdup(""); /* no branch */
1657                 }
1658         }
1659
1660         /*
1661          * We cannot move this anywhere earlier because we do want to
1662          * know if --root was given explicitly from the command line.
1663          */
1664         rev.show_root_diff = 1;
1665
1666         if (ignore_if_in_upstream) {
1667                 /* Don't say anything if head and upstream are the same. */
1668                 if (rev.pending.nr == 2) {
1669                         struct object_array_entry *o = rev.pending.objects;
1670                         if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1671                                 return 0;
1672                 }
1673                 get_patch_ids(&rev, &ids);
1674         }
1675
1676         if (prepare_revision_walk(&rev))
1677                 die(_("revision walk setup failed"));
1678         rev.boundary = 1;
1679         while ((commit = get_revision(&rev)) != NULL) {
1680                 if (commit->object.flags & BOUNDARY) {
1681                         boundary_count++;
1682                         origin = (boundary_count == 1) ? commit : NULL;
1683                         continue;
1684                 }
1685
1686                 if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
1687                         continue;
1688
1689                 nr++;
1690                 REALLOC_ARRAY(list, nr);
1691                 list[nr - 1] = commit;
1692         }
1693         if (nr == 0)
1694                 /* nothing to do */
1695                 return 0;
1696         total = nr;
1697         if (cover_letter == -1) {
1698                 if (config_cover_letter == COVER_AUTO)
1699                         cover_letter = (total > 1);
1700                 else
1701                         cover_letter = (config_cover_letter == COVER_ON);
1702         }
1703         if (!keep_subject && auto_number && (total > 1 || cover_letter))
1704                 numbered = 1;
1705         if (numbered)
1706                 rev.total = total + start_number - 1;
1707
1708         if (!signature) {
1709                 ; /* --no-signature inhibits all signatures */
1710         } else if (signature && signature != git_version_string) {
1711                 ; /* non-default signature already set */
1712         } else if (signature_file) {
1713                 struct strbuf buf = STRBUF_INIT;
1714
1715                 if (strbuf_read_file(&buf, signature_file, 128) < 0)
1716                         die_errno(_("unable to read signature file '%s'"), signature_file);
1717                 signature = strbuf_detach(&buf, NULL);
1718         }
1719
1720         memset(&bases, 0, sizeof(bases));
1721         if (base_commit || base_auto) {
1722                 struct commit *base = get_base_commit(base_commit, list, nr);
1723                 reset_revision_walk();
1724                 prepare_bases(&bases, base, list, nr);
1725         }
1726
1727         if (in_reply_to || thread || cover_letter)
1728                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1729         if (in_reply_to) {
1730                 const char *msgid = clean_message_id(in_reply_to);
1731                 string_list_append(rev.ref_message_ids, msgid);
1732         }
1733         rev.numbered_files = just_numbers;
1734         rev.patch_suffix = fmt_patch_suffix;
1735         if (cover_letter) {
1736                 if (thread)
1737                         gen_message_id(&rev, "cover");
1738                 make_cover_letter(&rev, use_stdout,
1739                                   origin, nr, list, branch_name, quiet);
1740                 print_bases(&bases, rev.diffopt.file);
1741                 print_signature(rev.diffopt.file);
1742                 total++;
1743                 start_number--;
1744         }
1745         rev.add_signoff = do_signoff;
1746         while (0 <= --nr) {
1747                 int shown;
1748                 commit = list[nr];
1749                 rev.nr = total - nr + (start_number - 1);
1750                 /* Make the second and subsequent mails replies to the first */
1751                 if (thread) {
1752                         /* Have we already had a message ID? */
1753                         if (rev.message_id) {
1754                                 /*
1755                                  * For deep threading: make every mail
1756                                  * a reply to the previous one, no
1757                                  * matter what other options are set.
1758                                  *
1759                                  * For shallow threading:
1760                                  *
1761                                  * Without --cover-letter and
1762                                  * --in-reply-to, make every mail a
1763                                  * reply to the one before.
1764                                  *
1765                                  * With --in-reply-to but no
1766                                  * --cover-letter, make every mail a
1767                                  * reply to the <reply-to>.
1768                                  *
1769                                  * With --cover-letter, make every
1770                                  * mail but the cover letter a reply
1771                                  * to the cover letter.  The cover
1772                                  * letter is a reply to the
1773                                  * --in-reply-to, if specified.
1774                                  */
1775                                 if (thread == THREAD_SHALLOW
1776                                     && rev.ref_message_ids->nr > 0
1777                                     && (!cover_letter || rev.nr > 1))
1778                                         free(rev.message_id);
1779                                 else
1780                                         string_list_append(rev.ref_message_ids,
1781                                                            rev.message_id);
1782                         }
1783                         gen_message_id(&rev, oid_to_hex(&commit->object.oid));
1784                 }
1785
1786                 if (!use_stdout &&
1787                     open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1788                         die(_("Failed to create output files"));
1789                 shown = log_tree_commit(&rev, commit);
1790                 free_commit_buffer(commit);
1791
1792                 /* We put one extra blank line between formatted
1793                  * patches and this flag is used by log-tree code
1794                  * to see if it needs to emit a LF before showing
1795                  * the log; when using one file per patch, we do
1796                  * not want the extra blank line.
1797                  */
1798                 if (!use_stdout)
1799                         rev.shown_one = 0;
1800                 if (shown) {
1801                         print_bases(&bases, rev.diffopt.file);
1802                         if (rev.mime_boundary)
1803                                 fprintf(rev.diffopt.file, "\n--%s%s--\n\n\n",
1804                                        mime_boundary_leader,
1805                                        rev.mime_boundary);
1806                         else
1807                                 print_signature(rev.diffopt.file);
1808                 }
1809                 if (!use_stdout)
1810                         fclose(rev.diffopt.file);
1811         }
1812         free(list);
1813         free(branch_name);
1814         string_list_clear(&extra_to, 0);
1815         string_list_clear(&extra_cc, 0);
1816         string_list_clear(&extra_hdr, 0);
1817         if (ignore_if_in_upstream)
1818                 free_patch_ids(&ids);
1819         return 0;
1820 }
1821
1822 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1823 {
1824         struct object_id oid;
1825         if (get_oid(arg, &oid) == 0) {
1826                 struct commit *commit = lookup_commit_reference(&oid);
1827                 if (commit) {
1828                         commit->object.flags |= flags;
1829                         add_pending_object(revs, &commit->object, arg);
1830                         return 0;
1831                 }
1832         }
1833         return -1;
1834 }
1835
1836 static const char * const cherry_usage[] = {
1837         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
1838         NULL
1839 };
1840
1841 static void print_commit(char sign, struct commit *commit, int verbose,
1842                          int abbrev, FILE *file)
1843 {
1844         if (!verbose) {
1845                 fprintf(file, "%c %s\n", sign,
1846                        find_unique_abbrev(commit->object.oid.hash, abbrev));
1847         } else {
1848                 struct strbuf buf = STRBUF_INIT;
1849                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1850                 fprintf(file, "%c %s %s\n", sign,
1851                        find_unique_abbrev(commit->object.oid.hash, abbrev),
1852                        buf.buf);
1853                 strbuf_release(&buf);
1854         }
1855 }
1856
1857 int cmd_cherry(int argc, const char **argv, const char *prefix)
1858 {
1859         struct rev_info revs;
1860         struct patch_ids ids;
1861         struct commit *commit;
1862         struct commit_list *list = NULL;
1863         struct branch *current_branch;
1864         const char *upstream;
1865         const char *head = "HEAD";
1866         const char *limit = NULL;
1867         int verbose = 0, abbrev = 0;
1868
1869         struct option options[] = {
1870                 OPT__ABBREV(&abbrev),
1871                 OPT__VERBOSE(&verbose, N_("be verbose")),
1872                 OPT_END()
1873         };
1874
1875         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1876
1877         switch (argc) {
1878         case 3:
1879                 limit = argv[2];
1880                 /* FALLTHROUGH */
1881         case 2:
1882                 head = argv[1];
1883                 /* FALLTHROUGH */
1884         case 1:
1885                 upstream = argv[0];
1886                 break;
1887         default:
1888                 current_branch = branch_get(NULL);
1889                 upstream = branch_get_upstream(current_branch, NULL);
1890                 if (!upstream) {
1891                         fprintf(stderr, _("Could not find a tracked"
1892                                         " remote branch, please"
1893                                         " specify <upstream> manually.\n"));
1894                         usage_with_options(cherry_usage, options);
1895                 }
1896         }
1897
1898         init_revisions(&revs, prefix);
1899         revs.max_parents = 1;
1900
1901         if (add_pending_commit(head, &revs, 0))
1902                 die(_("Unknown commit %s"), head);
1903         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1904                 die(_("Unknown commit %s"), upstream);
1905
1906         /* Don't say anything if head and upstream are the same. */
1907         if (revs.pending.nr == 2) {
1908                 struct object_array_entry *o = revs.pending.objects;
1909                 if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1910                         return 0;
1911         }
1912
1913         get_patch_ids(&revs, &ids);
1914
1915         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1916                 die(_("Unknown commit %s"), limit);
1917
1918         /* reverse the list of commits */
1919         if (prepare_revision_walk(&revs))
1920                 die(_("revision walk setup failed"));
1921         while ((commit = get_revision(&revs)) != NULL) {
1922                 commit_list_insert(commit, &list);
1923         }
1924
1925         while (list) {
1926                 char sign = '+';
1927
1928                 commit = list->item;
1929                 if (has_commit_patch_id(commit, &ids))
1930                         sign = '-';
1931                 print_commit(sign, commit, verbose, abbrev, revs.diffopt.file);
1932                 list = list->next;
1933         }
1934
1935         free_patch_ids(&ids);
1936         return 0;
1937 }