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