builtin/rev-list.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "diff.h"
   4 #include "revision.h"
   5 #include "list-objects.h"
   6 #include "builtin.h"
   7 #include "log-tree.h"
   8 #include "graph.h"
   9 #include "bisect.h"
  10
  11 static const char rev_list_usage[] =
  12 "git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  13 "  limiting output:\n"
  14 "    --max-count=<n>\n"
  15 "    --max-age=<epoch>\n"
  16 "    --min-age=<epoch>\n"
  17 "    --sparse\n"
  18 "    --no-merges\n"
  19 "    --min-parents=<n>\n"
  20 "    --no-min-parents\n"
  21 "    --max-parents=<n>\n"
  22 "    --no-max-parents\n"
  23 "    --remove-empty\n"
  24 "    --all\n"
  25 "    --branches\n"
  26 "    --tags\n"
  27 "    --remotes\n"
  28 "    --stdin\n"
  29 "    --quiet\n"
  30 "  ordering output:\n"
  31 "    --topo-order\n"
  32 "    --date-order\n"
  33 "    --reverse\n"
  34 "  formatting output:\n"
  35 "    --parents\n"
  36 "    --children\n"
  37 "    --objects | --objects-edge\n"
  38 "    --unpacked\n"
  39 "    --header | --pretty\n"
  40 "    --abbrev=<n> | --no-abbrev\n"
  41 "    --abbrev-commit\n"
  42 "    --left-right\n"
  43 "  special purpose:\n"
  44 "    --bisect\n"
  45 "    --bisect-vars\n"
  46 "    --bisect-all"
  47 ;
  48
  49 static void finish_commit(struct commit *commit, void *data);
  50 static void show_commit(struct commit *commit, void *data)
  51 {
  52         struct rev_list_info *info = data;
  53         struct rev_info *revs = info->revs;
  54
  55         graph_show_commit(revs->graph);
  56
  57         if (revs->count) {
  58                 if (commit->object.flags & PATCHSAME)
  59                         revs->count_same++;
  60                 else if (commit->object.flags & SYMMETRIC_LEFT)
  61                         revs->count_left++;
  62                 else
  63                         revs->count_right++;
  64                 finish_commit(commit, data);
  65                 return;
  66         }
  67
  68         if (info->show_timestamp)
  69                 printf("%lu ", commit->date);
  70         if (info->header_prefix)
  71                 fputs(info->header_prefix, stdout);
  72
  73         if (!revs->graph)
  74                 fputs(get_revision_mark(revs, commit), stdout);
  75         if (revs->abbrev_commit && revs->abbrev)
  76                 fputs(find_unique_abbrev(commit->object.sha1, revs->abbrev),
  77                       stdout);
  78         else
  79                 fputs(sha1_to_hex(commit->object.sha1), stdout);
  80         if (revs->print_parents) {
  81                 struct commit_list *parents = commit->parents;
  82                 while (parents) {
  83                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  84                         parents = parents->next;
  85                 }
  86         }
  87         if (revs->children.name) {
  88                 struct commit_list *children;
  89
  90                 children = lookup_decoration(&revs->children, &commit->object);
  91                 while (children) {
  92                         printf(" %s", sha1_to_hex(children->item->object.sha1));
  93                         children = children->next;
  94                 }
  95         }
  96         show_decorations(revs, commit);
  97         if (revs->commit_format == CMIT_FMT_ONELINE)
  98                 putchar(' ');
  99         else
 100                 putchar('\n');
 101
 102         if (revs->verbose_header && commit->buffer) {
 103                 struct strbuf buf = STRBUF_INIT;
 104                 struct pretty_print_context ctx = {0};
 105                 ctx.abbrev = revs->abbrev;
 106                 ctx.date_mode = revs->date_mode;
 107                 pretty_print_commit(revs->commit_format, commit, &buf, &ctx);
 108                 if (revs->graph) {
 109                         if (buf.len) {
 110                                 if (revs->commit_format != CMIT_FMT_ONELINE)
 111                                         graph_show_oneline(revs->graph);
 112
 113                                 graph_show_commit_msg(revs->graph, &buf);
 114
 115                                 /*
 116                                  * Add a newline after the commit message.
 117                                  *
 118                                  * Usually, this newline produces a blank
 119                                  * padding line between entries, in which case
 120                                  * we need to add graph padding on this line.
 121                                  *
 122                                  * However, the commit message may not end in a
 123                                  * newline.  In this case the newline simply
 124                                  * ends the last line of the commit message,
 125                                  * and we don't need any graph output.  (This
 126                                  * always happens with CMIT_FMT_ONELINE, and it
 127                                  * happens with CMIT_FMT_USERFORMAT when the
 128                                  * format doesn't explicitly end in a newline.)
 129                                  */
 130                                 if (buf.len && buf.buf[buf.len - 1] == '\n')
 131                                         graph_show_padding(revs->graph);
 132                                 putchar('\n');
 133                         } else {
 134                                 /*
 135                                  * If the message buffer is empty, just show
 136                                  * the rest of the graph output for this
 137                                  * commit.
 138                                  */
 139                                 if (graph_show_remainder(revs->graph))
 140                                         putchar('\n');
 141                                 if (revs->commit_format == CMIT_FMT_ONELINE)
 142                                         putchar('\n');
 143                         }
 144                 } else {
 145                         if (revs->commit_format != CMIT_FMT_USERFORMAT ||
 146                             buf.len) {
 147                                 fwrite(buf.buf, 1, buf.len, stdout);
 148                                 putchar(info->hdr_termination);
 149                         }
 150                 }
 151                 strbuf_release(&buf);
 152         } else {
 153                 if (graph_show_remainder(revs->graph))
 154                         putchar('\n');
 155         }
 156         maybe_flush_or_die(stdout, "stdout");
 157         finish_commit(commit, data);
 158 }
 159
 160 static void finish_commit(struct commit *commit, void *data)
 161 {
 162         if (commit->parents) {
 163                 free_commit_list(commit->parents);
 164                 commit->parents = NULL;
 165         }
 166         free(commit->buffer);
 167         commit->buffer = NULL;
 168 }
 169
 170 static void finish_object(struct object *obj, const struct name_path *path, const char *name)
 171 {
 172         if (obj->type == OBJ_BLOB && !has_sha1_file(obj->sha1))
 173                 die("missing blob object '%s'", sha1_to_hex(obj->sha1));
 174 }
 175
 176 static void show_object(struct object *obj, const struct name_path *path, const char *component)
 177 {
 178         char *name = path_name(path, component);
 179         /* An object with name "foo\n0000000..." can be used to
 180          * confuse downstream "git pack-objects" very badly.
 181          */
 182         const char *ep = strchr(name, '\n');
 183
 184         finish_object(obj, path, name);
 185         if (ep) {
 186                 printf("%s %.*s\n", sha1_to_hex(obj->sha1),
 187                        (int) (ep - name),
 188                        name);
 189         }
 190         else
 191                 printf("%s %s\n", sha1_to_hex(obj->sha1), name);
 192         free(name);
 193 }
 194
 195 static void show_edge(struct commit *commit)
 196 {
 197         printf("-%s\n", sha1_to_hex(commit->object.sha1));
 198 }
 199
 200 static inline int log2i(int n)
 201 {
 202         int log2 = 0;
 203
 204         for (; n > 1; n >>= 1)
 205                 log2++;
 206
 207         return log2;
 208 }
 209
 210 static inline int exp2i(int n)
 211 {
 212         return 1 << n;
 213 }
 214
 215 /*
 216  * Estimate the number of bisect steps left (after the current step)
 217  *
 218  * For any x between 0 included and 2^n excluded, the probability for
 219  * n - 1 steps left looks like:
 220  *
 221  * P(2^n + x) == (2^n - x) / (2^n + x)
 222  *
 223  * and P(2^n + x) < 0.5 means 2^n < 3x
 224  */
 225 int estimate_bisect_steps(int all)
 226 {
 227         int n, x, e;
 228
 229         if (all < 3)
 230                 return 0;
 231
 232         n = log2i(all);
 233         e = exp2i(n);
 234         x = all - e;
 235
 236         return (e < 3 * x) ? n : n - 1;
 237 }
 238
 239 void print_commit_list(struct commit_list *list,
 240                        const char *format_cur,
 241                        const char *format_last)
 242 {
 243         for ( ; list; list = list->next) {
 244                 const char *format = list->next ? format_cur : format_last;
 245                 printf(format, sha1_to_hex(list->item->object.sha1));
 246         }
 247 }
 248
 249 static void show_tried_revs(struct commit_list *tried)
 250 {
 251         printf("bisect_tried='");
 252         print_commit_list(tried, "%s|", "%s");
 253         printf("'\n");
 254 }
 255
 256 static void print_var_str(const char *var, const char *val)
 257 {
 258         printf("%s='%s'\n", var, val);
 259 }
 260
 261 static void print_var_int(const char *var, int val)
 262 {
 263         printf("%s=%d\n", var, val);
 264 }
 265
 266 static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
 267 {
 268         int cnt, flags = info->bisect_show_flags;
 269         char hex[41] = "";
 270         struct commit_list *tried;
 271         struct rev_info *revs = info->revs;
 272
 273         if (!revs->commits && !(flags & BISECT_SHOW_TRIED))
 274                 return 1;
 275
 276         revs->commits = filter_skipped(revs->commits, &tried,
 277                                        flags & BISECT_SHOW_ALL,
 278                                        NULL, NULL);
 279
 280         /*
 281          * revs->commits can reach "reaches" commits among
 282          * "all" commits.  If it is good, then there are
 283          * (all-reaches) commits left to be bisected.
 284          * On the other hand, if it is bad, then the set
 285          * to bisect is "reaches".
 286          * A bisect set of size N has (N-1) commits further
 287          * to test, as we already know one bad one.
 288          */
 289         cnt = all - reaches;
 290         if (cnt < reaches)
 291                 cnt = reaches;
 292
 293         if (revs->commits)
 294                 strcpy(hex, sha1_to_hex(revs->commits->item->object.sha1));
 295
 296         if (flags & BISECT_SHOW_ALL) {
 297                 traverse_commit_list(revs, show_commit, show_object, info);
 298                 printf("------\n");
 299         }
 300
 301         if (flags & BISECT_SHOW_TRIED)
 302                 show_tried_revs(tried);
 303
 304         print_var_str("bisect_rev", hex);
 305         print_var_int("bisect_nr", cnt - 1);
 306         print_var_int("bisect_good", all - reaches - 1);
 307         print_var_int("bisect_bad", reaches - 1);
 308         print_var_int("bisect_all", all);
 309         print_var_int("bisect_steps", estimate_bisect_steps(all));
 310
 311         return 0;
 312 }
 313
 314 int cmd_rev_list(int argc, const char **argv, const char *prefix)
 315 {
 316         struct rev_info revs;
 317         struct rev_list_info info;
 318         int i;
 319         int bisect_list = 0;
 320         int bisect_show_vars = 0;
 321         int bisect_find_all = 0;
 322         int quiet = 0;
 323
 324         git_config(git_default_config, NULL);
 325         init_revisions(&revs, prefix);
 326         revs.abbrev = DEFAULT_ABBREV;
 327         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 328         argc = setup_revisions(argc, argv, &revs, NULL);
 329
 330         memset(&info, 0, sizeof(info));
 331         info.revs = &revs;
 332         if (revs.bisect)
 333                 bisect_list = 1;
 334
 335         quiet = DIFF_OPT_TST(&revs.diffopt, QUICK);
 336         for (i = 1 ; i < argc; i++) {
 337                 const char *arg = argv[i];
 338
 339                 if (!strcmp(arg, "--header")) {
 340                         revs.verbose_header = 1;
 341                         continue;
 342                 }
 343                 if (!strcmp(arg, "--timestamp")) {
 344                         info.show_timestamp = 1;
 345                         continue;
 346                 }
 347                 if (!strcmp(arg, "--bisect")) {
 348                         bisect_list = 1;
 349                         continue;
 350                 }
 351                 if (!strcmp(arg, "--bisect-all")) {
 352                         bisect_list = 1;
 353                         bisect_find_all = 1;
 354                         info.bisect_show_flags = BISECT_SHOW_ALL;
 355                         revs.show_decorations = 1;
 356                         continue;
 357                 }
 358                 if (!strcmp(arg, "--bisect-vars")) {
 359                         bisect_list = 1;
 360                         bisect_show_vars = 1;
 361                         continue;
 362                 }
 363                 usage(rev_list_usage);
 364
 365         }
 366         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 367                 /* The command line has a --pretty  */
 368                 info.hdr_termination = '\n';
 369                 if (revs.commit_format == CMIT_FMT_ONELINE)
 370                         info.header_prefix = "";
 371                 else
 372                         info.header_prefix = "commit ";
 373         }
 374         else if (revs.verbose_header)
 375                 /* Only --header was specified */
 376                 revs.commit_format = CMIT_FMT_RAW;
 377
 378         if ((!revs.commits &&
 379              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 380               !revs.pending.nr)) ||
 381             revs.diff)
 382                 usage(rev_list_usage);
 383
 384         save_commit_buffer = (revs.verbose_header ||
 385                               revs.grep_filter.pattern_list ||
 386                               revs.grep_filter.header_list);
 387         if (bisect_list)
 388                 revs.limited = 1;
 389
 390         if (prepare_revision_walk(&revs))
 391                 die("revision walk setup failed");
 392         if (revs.tree_objects)
 393                 mark_edges_uninteresting(revs.commits, &revs, show_edge);
 394
 395         if (bisect_list) {
 396                 int reaches = reaches, all = all;
 397
 398                 revs.commits = find_bisection(revs.commits, &reaches, &all,
 399                                               bisect_find_all);
 400
 401                 if (bisect_show_vars)
 402                         return show_bisect_vars(&info, reaches, all);
 403         }
 404
 405         traverse_commit_list(&revs,
 406                              quiet ? finish_commit : show_commit,
 407                              quiet ? finish_object : show_object,
 408                              &info);
 409
 410         if (revs.count) {
 411                 if (revs.left_right && revs.cherry_mark)
 412                         printf("%d\t%d\t%d\n", revs.count_left, revs.count_right, revs.count_same);
 413                 else if (revs.left_right)
 414                         printf("%d\t%d\n", revs.count_left, revs.count_right);
 415                 else if (revs.cherry_mark)
 416                         printf("%d\t%d\n", revs.count_left + revs.count_right, revs.count_same);
 417                 else
 418                         printf("%d\n", revs.count_left + revs.count_right);
 419         }
 420
 421         return 0;
 422 }