Andrew's git - gitweb.git/blob - builtin/fmt-merge-msg.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "commit.h"
   4#include "diff.h"
   5#include "revision.h"
   6#include "tag.h"
   7#include "string-list.h"
   8#include "branch.h"
   9#include "fmt-merge-msg.h"
  10#include "gpg-interface.h"
  11
  12static const char * const fmt_merge_msg_usage[] = {
  13        "git fmt-merge-msg [-m <message>] [--log[=<n>]|--no-log] [--file <file>]",
  14        NULL
  15};
  16
  17static int use_branch_desc;
  18
  19int fmt_merge_msg_config(const char *key, const char *value, void *cb)
  20{
  21        if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
  22                int is_bool;
  23                merge_log_config = git_config_bool_or_int(key, value, &is_bool);
  24                if (!is_bool && merge_log_config < 0)
  25                        return error("%s: negative length %s", key, value);
  26                if (is_bool && merge_log_config)
  27                        merge_log_config = DEFAULT_MERGE_LOG_LEN;
  28        } else if (!strcmp(key, "merge.branchdesc")) {
  29                use_branch_desc = git_config_bool(key, value);
  30        }
  31        return 0;
  32}
  33
  34/* merge data per repository where the merged tips came from */
  35struct src_data {
  36        struct string_list branch, tag, r_branch, generic;
  37        int head_status;
  38};
  39
  40struct origin_data {
  41        unsigned char sha1[20];
  42        unsigned is_local_branch:1;
  43};
  44
  45static void init_src_data(struct src_data *data)
  46{
  47        data->branch.strdup_strings = 1;
  48        data->tag.strdup_strings = 1;
  49        data->r_branch.strdup_strings = 1;
  50        data->generic.strdup_strings = 1;
  51}
  52
  53static struct string_list srcs = STRING_LIST_INIT_DUP;
  54static struct string_list origins = STRING_LIST_INIT_DUP;
  55
  56struct merge_parents {
  57        int alloc, nr;
  58        struct merge_parent {
  59                unsigned char given[20];
  60                unsigned char commit[20];
  61                unsigned char used;
  62        } *item;
  63};
  64
  65/*
  66 * I know, I know, this is inefficient, but you won't be pulling and merging
  67 * hundreds of heads at a time anyway.
  68 */
  69static struct merge_parent *find_merge_parent(struct merge_parents *table,
  70                                              unsigned char *given,
  71                                              unsigned char *commit)
  72{
  73        int i;
  74        for (i = 0; i < table->nr; i++) {
  75                if (given && hashcmp(table->item[i].given, given))
  76                        continue;
  77                if (commit && hashcmp(table->item[i].commit, commit))
  78                        continue;
  79                return &table->item[i];
  80        }
  81        return NULL;
  82}
  83
  84static void add_merge_parent(struct merge_parents *table,
  85                             unsigned char *given,
  86                             unsigned char *commit)
  87{
  88        if (table->nr && find_merge_parent(table, given, commit))
  89                return;
  90        ALLOC_GROW(table->item, table->nr + 1, table->alloc);
  91        hashcpy(table->item[table->nr].given, given);
  92        hashcpy(table->item[table->nr].commit, commit);
  93        table->item[table->nr].used = 0;
  94        table->nr++;
  95}
  96
  97static int handle_line(char *line, struct merge_parents *merge_parents)
  98{
  99        int i, len = strlen(line);
 100        struct origin_data *origin_data;
 101        char *src, *origin;
 102        struct src_data *src_data;
 103        struct string_list_item *item;
 104        int pulling_head = 0;
 105        unsigned char sha1[20];
 106
 107        if (len < 43 || line[40] != '\t')
 108                return 1;
 109
 110        if (!prefixcmp(line + 41, "not-for-merge"))
 111                return 0;
 112
 113        if (line[41] != '\t')
 114                return 2;
 115
 116        i = get_sha1_hex(line, sha1);
 117        if (i)
 118                return 3;
 119
 120        if (!find_merge_parent(merge_parents, sha1, NULL))
 121                return 0; /* subsumed by other parents */
 122
 123        origin_data = xcalloc(1, sizeof(struct origin_data));
 124        hashcpy(origin_data->sha1, sha1);
 125
 126        if (line[len - 1] == '\n')
 127                line[len - 1] = 0;
 128        line += 42;
 129
 130        /*
 131         * At this point, line points at the beginning of comment e.g.
 132         * "branch 'frotz' of git://that/repository.git".
 133         * Find the repository name and point it with src.
 134         */
 135        src = strstr(line, " of ");
 136        if (src) {
 137                *src = 0;
 138                src += 4;
 139                pulling_head = 0;
 140        } else {
 141                src = line;
 142                pulling_head = 1;
 143        }
 144
 145        item = unsorted_string_list_lookup(&srcs, src);
 146        if (!item) {
 147                item = string_list_append(&srcs, src);
 148                item->util = xcalloc(1, sizeof(struct src_data));
 149                init_src_data(item->util);
 150        }
 151        src_data = item->util;
 152
 153        if (pulling_head) {
 154                origin = src;
 155                src_data->head_status |= 1;
 156        } else if (!prefixcmp(line, "branch ")) {
 157                origin_data->is_local_branch = 1;
 158                origin = line + 7;
 159                string_list_append(&src_data->branch, origin);
 160                src_data->head_status |= 2;
 161        } else if (!prefixcmp(line, "tag ")) {
 162                origin = line;
 163                string_list_append(&src_data->tag, origin + 4);
 164                src_data->head_status |= 2;
 165        } else if (!prefixcmp(line, "remote-tracking branch ")) {
 166                origin = line + strlen("remote-tracking branch ");
 167                string_list_append(&src_data->r_branch, origin);
 168                src_data->head_status |= 2;
 169        } else {
 170                origin = src;
 171                string_list_append(&src_data->generic, line);
 172                src_data->head_status |= 2;
 173        }
 174
 175        if (!strcmp(".", src) || !strcmp(src, origin)) {
 176                int len = strlen(origin);
 177                if (origin[0] == '\'' && origin[len - 1] == '\'')
 178                        origin = xmemdupz(origin + 1, len - 2);
 179        } else {
 180                char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
 181                sprintf(new_origin, "%s of %s", origin, src);
 182                origin = new_origin;
 183        }
 184        if (strcmp(".", src))
 185                origin_data->is_local_branch = 0;
 186        string_list_append(&origins, origin)->util = origin_data;
 187        return 0;
 188}
 189
 190static void print_joined(const char *singular, const char *plural,
 191                struct string_list *list, struct strbuf *out)
 192{
 193        if (list->nr == 0)
 194                return;
 195        if (list->nr == 1) {
 196                strbuf_addf(out, "%s%s", singular, list->items[0].string);
 197        } else {
 198                int i;
 199                strbuf_addstr(out, plural);
 200                for (i = 0; i < list->nr - 1; i++)
 201                        strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
 202                                    list->items[i].string);
 203                strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
 204        }
 205}
 206
 207static void add_branch_desc(struct strbuf *out, const char *name)
 208{
 209        struct strbuf desc = STRBUF_INIT;
 210
 211        if (!read_branch_desc(&desc, name)) {
 212                const char *bp = desc.buf;
 213                while (*bp) {
 214                        const char *ep = strchrnul(bp, '\n');
 215                        if (*ep)
 216                                ep++;
 217                        strbuf_addf(out, "  : %.*s", (int)(ep - bp), bp);
 218                        bp = ep;
 219                }
 220                if (out->buf[out->len - 1] != '\n')
 221                        strbuf_addch(out, '\n');
 222        }
 223        strbuf_release(&desc);
 224}
 225
 226static void shortlog(const char *name,
 227                     struct origin_data *origin_data,
 228                     struct commit *head,
 229                     struct rev_info *rev, int limit,
 230                     struct strbuf *out)
 231{
 232        int i, count = 0;
 233        struct commit *commit;
 234        struct object *branch;
 235        struct string_list subjects = STRING_LIST_INIT_DUP;
 236        int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 237        struct strbuf sb = STRBUF_INIT;
 238        const unsigned char *sha1 = origin_data->sha1;
 239
 240        branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 241        if (!branch || branch->type != OBJ_COMMIT)
 242                return;
 243
 244        setup_revisions(0, NULL, rev, NULL);
 245        rev->ignore_merges = 1;
 246        add_pending_object(rev, branch, name);
 247        add_pending_object(rev, &head->object, "^HEAD");
 248        head->object.flags |= UNINTERESTING;
 249        if (prepare_revision_walk(rev))
 250                die("revision walk setup failed");
 251        while ((commit = get_revision(rev)) != NULL) {
 252                struct pretty_print_context ctx = {0};
 253
 254                /* ignore merges */
 255                if (commit->parents && commit->parents->next)
 256                        continue;
 257
 258                count++;
 259                if (subjects.nr > limit)
 260                        continue;
 261
 262                format_commit_message(commit, "%s", &sb, &ctx);
 263                strbuf_ltrim(&sb);
 264
 265                if (!sb.len)
 266                        string_list_append(&subjects,
 267                                           sha1_to_hex(commit->object.sha1));
 268                else
 269                        string_list_append(&subjects, strbuf_detach(&sb, NULL));
 270        }
 271
 272        if (count > limit)
 273                strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 274        else
 275                strbuf_addf(out, "\n* %s:\n", name);
 276
 277        if (origin_data->is_local_branch && use_branch_desc)
 278                add_branch_desc(out, name);
 279
 280        for (i = 0; i < subjects.nr; i++)
 281                if (i >= limit)
 282                        strbuf_addf(out, "  ...\n");
 283                else
 284                        strbuf_addf(out, "  %s\n", subjects.items[i].string);
 285
 286        clear_commit_marks((struct commit *)branch, flags);
 287        clear_commit_marks(head, flags);
 288        free_commit_list(rev->commits);
 289        rev->commits = NULL;
 290        rev->pending.nr = 0;
 291
 292        string_list_clear(&subjects, 0);
 293}
 294
 295static void fmt_merge_msg_title(struct strbuf *out,
 296        const char *current_branch) {
 297        int i = 0;
 298        char *sep = "";
 299
 300        strbuf_addstr(out, "Merge ");
 301        for (i = 0; i < srcs.nr; i++) {
 302                struct src_data *src_data = srcs.items[i].util;
 303                const char *subsep = "";
 304
 305                strbuf_addstr(out, sep);
 306                sep = "; ";
 307
 308                if (src_data->head_status == 1) {
 309                        strbuf_addstr(out, srcs.items[i].string);
 310                        continue;
 311                }
 312                if (src_data->head_status == 3) {
 313                        subsep = ", ";
 314                        strbuf_addstr(out, "HEAD");
 315                }
 316                if (src_data->branch.nr) {
 317                        strbuf_addstr(out, subsep);
 318                        subsep = ", ";
 319                        print_joined("branch ", "branches ", &src_data->branch,
 320                                        out);
 321                }
 322                if (src_data->r_branch.nr) {
 323                        strbuf_addstr(out, subsep);
 324                        subsep = ", ";
 325                        print_joined("remote-tracking branch ", "remote-tracking branches ",
 326                                        &src_data->r_branch, out);
 327                }
 328                if (src_data->tag.nr) {
 329                        strbuf_addstr(out, subsep);
 330                        subsep = ", ";
 331                        print_joined("tag ", "tags ", &src_data->tag, out);
 332                }
 333                if (src_data->generic.nr) {
 334                        strbuf_addstr(out, subsep);
 335                        print_joined("commit ", "commits ", &src_data->generic,
 336                                        out);
 337                }
 338                if (strcmp(".", srcs.items[i].string))
 339                        strbuf_addf(out, " of %s", srcs.items[i].string);
 340        }
 341
 342        if (!strcmp("master", current_branch))
 343                strbuf_addch(out, '\n');
 344        else
 345                strbuf_addf(out, " into %s\n", current_branch);
 346}
 347
 348static void fmt_tag_signature(struct strbuf *tagbuf,
 349                              struct strbuf *sig,
 350                              const char *buf,
 351                              unsigned long len)
 352{
 353        const char *tag_body = strstr(buf, "\n\n");
 354        if (tag_body) {
 355                tag_body += 2;
 356                strbuf_add(tagbuf, tag_body, buf + len - tag_body);
 357        }
 358        strbuf_complete_line(tagbuf);
 359        strbuf_add_lines(tagbuf, "# ", sig->buf, sig->len);
 360}
 361
 362static void fmt_merge_msg_sigs(struct strbuf *out)
 363{
 364        int i, tag_number = 0, first_tag = 0;
 365        struct strbuf tagbuf = STRBUF_INIT;
 366
 367        for (i = 0; i < origins.nr; i++) {
 368                unsigned char *sha1 = origins.items[i].util;
 369                enum object_type type;
 370                unsigned long size, len;
 371                char *buf = read_sha1_file(sha1, &type, &size);
 372                struct strbuf sig = STRBUF_INIT;
 373
 374                if (!buf || type != OBJ_TAG)
 375                        goto next;
 376                len = parse_signature(buf, size);
 377
 378                if (size == len)
 379                        ; /* merely annotated */
 380                else if (verify_signed_buffer(buf, len, buf + len, size - len, &sig)) {
 381                        if (!sig.len)
 382                                strbuf_addstr(&sig, "gpg verification failed.\n");
 383                }
 384
 385                if (!tag_number++) {
 386                        fmt_tag_signature(&tagbuf, &sig, buf, len);
 387                        first_tag = i;
 388                } else {
 389                        if (tag_number == 2) {
 390                                struct strbuf tagline = STRBUF_INIT;
 391                                strbuf_addf(&tagline, "\n# %s\n",
 392                                            origins.items[first_tag].string);
 393                                strbuf_insert(&tagbuf, 0, tagline.buf,
 394                                              tagline.len);
 395                                strbuf_release(&tagline);
 396                        }
 397                        strbuf_addf(&tagbuf, "\n# %s\n",
 398                                    origins.items[i].string);
 399                        fmt_tag_signature(&tagbuf, &sig, buf, len);
 400                }
 401                strbuf_release(&sig);
 402        next:
 403                free(buf);
 404        }
 405        if (tagbuf.len) {
 406                strbuf_addch(out, '\n');
 407                strbuf_addbuf(out, &tagbuf);
 408        }
 409        strbuf_release(&tagbuf);
 410}
 411
 412static void find_merge_parents(struct merge_parents *result,
 413                               struct strbuf *in, unsigned char *head)
 414{
 415        struct commit_list *parents, *next;
 416        struct commit *head_commit;
 417        int pos = 0, i, j;
 418
 419        parents = NULL;
 420        while (pos < in->len) {
 421                int len;
 422                char *p = in->buf + pos;
 423                char *newline = strchr(p, '\n');
 424                unsigned char sha1[20];
 425                struct commit *parent;
 426                struct object *obj;
 427
 428                len = newline ? newline - p : strlen(p);
 429                pos += len + !!newline;
 430
 431                if (len < 43 ||
 432                    get_sha1_hex(p, sha1) ||
 433                    p[40] != '\t' ||
 434                    p[41] != '\t')
 435                        continue; /* skip not-for-merge */
 436                /*
 437                 * Do not use get_merge_parent() here; we do not have
 438                 * "name" here and we do not want to contaminate its
 439                 * util field yet.
 440                 */
 441                obj = parse_object(sha1);
 442                parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
 443                if (!parent)
 444                        continue;
 445                commit_list_insert(parent, &parents);
 446                add_merge_parent(result, obj->sha1, parent->object.sha1);
 447        }
 448        head_commit = lookup_commit(head);
 449        if (head_commit)
 450                commit_list_insert(head_commit, &parents);
 451        parents = reduce_heads(parents);
 452
 453        while (parents) {
 454                for (i = 0; i < result->nr; i++)
 455                        if (!hashcmp(result->item[i].commit,
 456                                     parents->item->object.sha1))
 457                                result->item[i].used = 1;
 458                next = parents->next;
 459                free(parents);
 460                parents = next;
 461        }
 462
 463        for (i = j = 0; i < result->nr; i++) {
 464                if (result->item[i].used) {
 465                        if (i != j)
 466                                result->item[j] = result->item[i];
 467                        j++;
 468                }
 469        }
 470        result->nr = j;
 471}
 472
 473int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 474                  struct fmt_merge_msg_opts *opts)
 475{
 476        int i = 0, pos = 0;
 477        unsigned char head_sha1[20];
 478        const char *current_branch;
 479        void *current_branch_to_free;
 480        struct merge_parents merge_parents;
 481
 482        memset(&merge_parents, 0, sizeof(merge_parents));
 483
 484        /* get current branch */
 485        current_branch = current_branch_to_free =
 486                resolve_refdup("HEAD", head_sha1, 1, NULL);
 487        if (!current_branch)
 488                die("No current branch");
 489        if (!prefixcmp(current_branch, "refs/heads/"))
 490                current_branch += 11;
 491
 492        find_merge_parents(&merge_parents, in, head_sha1);
 493
 494        /* get a line */
 495        while (pos < in->len) {
 496                int len;
 497                char *newline, *p = in->buf + pos;
 498
 499                newline = strchr(p, '\n');
 500                len = newline ? newline - p : strlen(p);
 501                pos += len + !!newline;
 502                i++;
 503                p[len] = 0;
 504                if (handle_line(p, &merge_parents))
 505                        die ("Error in line %d: %.*s", i, len, p);
 506        }
 507
 508        if (opts->add_title && srcs.nr)
 509                fmt_merge_msg_title(out, current_branch);
 510
 511        if (origins.nr)
 512                fmt_merge_msg_sigs(out);
 513
 514        if (opts->shortlog_len) {
 515                struct commit *head;
 516                struct rev_info rev;
 517
 518                head = lookup_commit_or_die(head_sha1, "HEAD");
 519                init_revisions(&rev, NULL);
 520                rev.commit_format = CMIT_FMT_ONELINE;
 521                rev.ignore_merges = 1;
 522                rev.limited = 1;
 523
 524                if (suffixcmp(out->buf, "\n"))
 525                        strbuf_addch(out, '\n');
 526
 527                for (i = 0; i < origins.nr; i++)
 528                        shortlog(origins.items[i].string,
 529                                 origins.items[i].util,
 530                                 head, &rev, opts->shortlog_len, out);
 531        }
 532
 533        strbuf_complete_line(out);
 534        free(current_branch_to_free);
 535        free(merge_parents.item);
 536        return 0;
 537}
 538
 539int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 540{
 541        const char *inpath = NULL;
 542        const char *message = NULL;
 543        int shortlog_len = -1;
 544        struct option options[] = {
 545                { OPTION_INTEGER, 0, "log", &shortlog_len, "n",
 546                  "populate log with at most <n> entries from shortlog",
 547                  PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
 548                { OPTION_INTEGER, 0, "summary", &shortlog_len, "n",
 549                  "alias for --log (deprecated)",
 550                  PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
 551                  DEFAULT_MERGE_LOG_LEN },
 552                OPT_STRING('m', "message", &message, "text",
 553                        "use <text> as start of message"),
 554                OPT_FILENAME('F', "file", &inpath, "file to read from"),
 555                OPT_END()
 556        };
 557
 558        FILE *in = stdin;
 559        struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
 560        int ret;
 561        struct fmt_merge_msg_opts opts;
 562
 563        git_config(fmt_merge_msg_config, NULL);
 564        argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
 565                             0);
 566        if (argc > 0)
 567                usage_with_options(fmt_merge_msg_usage, options);
 568        if (shortlog_len < 0)
 569                shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
 570
 571        if (inpath && strcmp(inpath, "-")) {
 572                in = fopen(inpath, "r");
 573                if (!in)
 574                        die_errno("cannot open '%s'", inpath);
 575        }
 576
 577        if (strbuf_read(&input, fileno(in), 0) < 0)
 578                die_errno("could not read input file");
 579
 580        if (message)
 581                strbuf_addstr(&output, message);
 582
 583        memset(&opts, 0, sizeof(opts));
 584        opts.add_title = !message;
 585        opts.shortlog_len = shortlog_len;
 586
 587        ret = fmt_merge_msg(&input, &output, &opts);
 588        if (ret)
 589                return ret;
 590        write_in_full(STDOUT_FILENO, output.buf, output.len);
 591        return 0;
 592}