Andrew's git / gitweb.git / commit-graph.c
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commit-graph.con commit commit-graph: error out on invalid commit oids in 'write --stdin-commits' (7c5c9b9)
   1#include "cache.h"
   2#include "config.h"
   3#include "dir.h"
   4#include "git-compat-util.h"
   5#include "lockfile.h"
   6#include "pack.h"
   7#include "packfile.h"
   8#include "commit.h"
   9#include "object.h"
  10#include "refs.h"
  11#include "revision.h"
  12#include "sha1-lookup.h"
  13#include "commit-graph.h"
  14#include "object-store.h"
  15#include "alloc.h"
  16#include "hashmap.h"
  17#include "replace-object.h"
  18#include "progress.h"
  19
  20#define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
  21#define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
  22#define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
  23#define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */
  24#define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
  25#define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */
  26
  27#define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16)
  28
  29#define GRAPH_VERSION_1 0x1
  30#define GRAPH_VERSION GRAPH_VERSION_1
  31
  32#define GRAPH_EXTRA_EDGES_NEEDED 0x80000000
  33#define GRAPH_EDGE_LAST_MASK 0x7fffffff
  34#define GRAPH_PARENT_NONE 0x70000000
  35
  36#define GRAPH_LAST_EDGE 0x80000000
  37
  38#define GRAPH_HEADER_SIZE 8
  39#define GRAPH_FANOUT_SIZE (4 * 256)
  40#define GRAPH_CHUNKLOOKUP_WIDTH 12
  41#define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
  42                        + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
  43
  44char *get_commit_graph_filename(const char *obj_dir)
  45{
  46        char *filename = xstrfmt("%s/info/commit-graph", obj_dir);
  47        char *normalized = xmalloc(strlen(filename) + 1);
  48        normalize_path_copy(normalized, filename);
  49        free(filename);
  50        return normalized;
  51}
  52
  53static char *get_split_graph_filename(const char *obj_dir,
  54                                      const char *oid_hex)
  55{
  56        char *filename = xstrfmt("%s/info/commit-graphs/graph-%s.graph",
  57                                 obj_dir,
  58                                 oid_hex);
  59        char *normalized = xmalloc(strlen(filename) + 1);
  60        normalize_path_copy(normalized, filename);
  61        free(filename);
  62        return normalized;
  63}
  64
  65static char *get_chain_filename(const char *obj_dir)
  66{
  67        return xstrfmt("%s/info/commit-graphs/commit-graph-chain", obj_dir);
  68}
  69
  70static uint8_t oid_version(void)
  71{
  72        return 1;
  73}
  74
  75static struct commit_graph *alloc_commit_graph(void)
  76{
  77        struct commit_graph *g = xcalloc(1, sizeof(*g));
  78        g->graph_fd = -1;
  79
  80        return g;
  81}
  82
  83extern int read_replace_refs;
  84
  85static int commit_graph_compatible(struct repository *r)
  86{
  87        if (!r->gitdir)
  88                return 0;
  89
  90        if (read_replace_refs) {
  91                prepare_replace_object(r);
  92                if (hashmap_get_size(&r->objects->replace_map->map))
  93                        return 0;
  94        }
  95
  96        prepare_commit_graft(r);
  97        if (r->parsed_objects && r->parsed_objects->grafts_nr)
  98                return 0;
  99        if (is_repository_shallow(r))
 100                return 0;
 101
 102        return 1;
 103}
 104
 105int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
 106{
 107        *fd = git_open(graph_file);
 108        if (*fd < 0)
 109                return 0;
 110        if (fstat(*fd, st)) {
 111                close(*fd);
 112                return 0;
 113        }
 114        return 1;
 115}
 116
 117struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st)
 118{
 119        void *graph_map;
 120        size_t graph_size;
 121        struct commit_graph *ret;
 122
 123        graph_size = xsize_t(st->st_size);
 124
 125        if (graph_size < GRAPH_MIN_SIZE) {
 126                close(fd);
 127                error(_("commit-graph file is too small"));
 128                return NULL;
 129        }
 130        graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
 131        ret = parse_commit_graph(graph_map, fd, graph_size);
 132
 133        if (!ret) {
 134                munmap(graph_map, graph_size);
 135                close(fd);
 136        }
 137
 138        return ret;
 139}
 140
 141static int verify_commit_graph_lite(struct commit_graph *g)
 142{
 143        /*
 144         * Basic validation shared between parse_commit_graph()
 145         * which'll be called every time the graph is used, and the
 146         * much more expensive verify_commit_graph() used by
 147         * "commit-graph verify".
 148         *
 149         * There should only be very basic checks here to ensure that
 150         * we don't e.g. segfault in fill_commit_in_graph(), but
 151         * because this is a very hot codepath nothing that e.g. loops
 152         * over g->num_commits, or runs a checksum on the commit-graph
 153         * itself.
 154         */
 155        if (!g->chunk_oid_fanout) {
 156                error("commit-graph is missing the OID Fanout chunk");
 157                return 1;
 158        }
 159        if (!g->chunk_oid_lookup) {
 160                error("commit-graph is missing the OID Lookup chunk");
 161                return 1;
 162        }
 163        if (!g->chunk_commit_data) {
 164                error("commit-graph is missing the Commit Data chunk");
 165                return 1;
 166        }
 167
 168        return 0;
 169}
 170
 171struct commit_graph *parse_commit_graph(void *graph_map, int fd,
 172                                        size_t graph_size)
 173{
 174        const unsigned char *data, *chunk_lookup;
 175        uint32_t i;
 176        struct commit_graph *graph;
 177        uint64_t last_chunk_offset;
 178        uint32_t last_chunk_id;
 179        uint32_t graph_signature;
 180        unsigned char graph_version, hash_version;
 181
 182        if (!graph_map)
 183                return NULL;
 184
 185        if (graph_size < GRAPH_MIN_SIZE)
 186                return NULL;
 187
 188        data = (const unsigned char *)graph_map;
 189
 190        graph_signature = get_be32(data);
 191        if (graph_signature != GRAPH_SIGNATURE) {
 192                error(_("commit-graph signature %X does not match signature %X"),
 193                      graph_signature, GRAPH_SIGNATURE);
 194                return NULL;
 195        }
 196
 197        graph_version = *(unsigned char*)(data + 4);
 198        if (graph_version != GRAPH_VERSION) {
 199                error(_("commit-graph version %X does not match version %X"),
 200                      graph_version, GRAPH_VERSION);
 201                return NULL;
 202        }
 203
 204        hash_version = *(unsigned char*)(data + 5);
 205        if (hash_version != oid_version()) {
 206                error(_("commit-graph hash version %X does not match version %X"),
 207                      hash_version, oid_version());
 208                return NULL;
 209        }
 210
 211        graph = alloc_commit_graph();
 212
 213        graph->hash_len = the_hash_algo->rawsz;
 214        graph->num_chunks = *(unsigned char*)(data + 6);
 215        graph->graph_fd = fd;
 216        graph->data = graph_map;
 217        graph->data_len = graph_size;
 218
 219        last_chunk_id = 0;
 220        last_chunk_offset = 8;
 221        chunk_lookup = data + 8;
 222        for (i = 0; i < graph->num_chunks; i++) {
 223                uint32_t chunk_id;
 224                uint64_t chunk_offset;
 225                int chunk_repeated = 0;
 226
 227                if (data + graph_size - chunk_lookup <
 228                    GRAPH_CHUNKLOOKUP_WIDTH) {
 229                        error(_("commit-graph chunk lookup table entry missing; file may be incomplete"));
 230                        free(graph);
 231                        return NULL;
 232                }
 233
 234                chunk_id = get_be32(chunk_lookup + 0);
 235                chunk_offset = get_be64(chunk_lookup + 4);
 236
 237                chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
 238
 239                if (chunk_offset > graph_size - the_hash_algo->rawsz) {
 240                        error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
 241                              (uint32_t)chunk_offset);
 242                        free(graph);
 243                        return NULL;
 244                }
 245
 246                switch (chunk_id) {
 247                case GRAPH_CHUNKID_OIDFANOUT:
 248                        if (graph->chunk_oid_fanout)
 249                                chunk_repeated = 1;
 250                        else
 251                                graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset);
 252                        break;
 253
 254                case GRAPH_CHUNKID_OIDLOOKUP:
 255                        if (graph->chunk_oid_lookup)
 256                                chunk_repeated = 1;
 257                        else
 258                                graph->chunk_oid_lookup = data + chunk_offset;
 259                        break;
 260
 261                case GRAPH_CHUNKID_DATA:
 262                        if (graph->chunk_commit_data)
 263                                chunk_repeated = 1;
 264                        else
 265                                graph->chunk_commit_data = data + chunk_offset;
 266                        break;
 267
 268                case GRAPH_CHUNKID_EXTRAEDGES:
 269                        if (graph->chunk_extra_edges)
 270                                chunk_repeated = 1;
 271                        else
 272                                graph->chunk_extra_edges = data + chunk_offset;
 273                        break;
 274
 275                case GRAPH_CHUNKID_BASE:
 276                        if (graph->chunk_base_graphs)
 277                                chunk_repeated = 1;
 278                        else
 279                                graph->chunk_base_graphs = data + chunk_offset;
 280                }
 281
 282                if (chunk_repeated) {
 283                        error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
 284                        free(graph);
 285                        return NULL;
 286                }
 287
 288                if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP)
 289                {
 290                        graph->num_commits = (chunk_offset - last_chunk_offset)
 291                                             / graph->hash_len;
 292                }
 293
 294                last_chunk_id = chunk_id;
 295                last_chunk_offset = chunk_offset;
 296        }
 297
 298        hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
 299
 300        if (verify_commit_graph_lite(graph)) {
 301                free(graph);
 302                return NULL;
 303        }
 304
 305        return graph;
 306}
 307
 308static struct commit_graph *load_commit_graph_one(const char *graph_file)
 309{
 310
 311        struct stat st;
 312        int fd;
 313        struct commit_graph *g;
 314        int open_ok = open_commit_graph(graph_file, &fd, &st);
 315
 316        if (!open_ok)
 317                return NULL;
 318
 319        g = load_commit_graph_one_fd_st(fd, &st);
 320
 321        if (g)
 322                g->filename = xstrdup(graph_file);
 323
 324        return g;
 325}
 326
 327static struct commit_graph *load_commit_graph_v1(struct repository *r, const char *obj_dir)
 328{
 329        char *graph_name = get_commit_graph_filename(obj_dir);
 330        struct commit_graph *g = load_commit_graph_one(graph_name);
 331        free(graph_name);
 332
 333        if (g)
 334                g->obj_dir = obj_dir;
 335
 336        return g;
 337}
 338
 339static int add_graph_to_chain(struct commit_graph *g,
 340                              struct commit_graph *chain,
 341                              struct object_id *oids,
 342                              int n)
 343{
 344        struct commit_graph *cur_g = chain;
 345
 346        if (n && !g->chunk_base_graphs) {
 347                warning(_("commit-graph has no base graphs chunk"));
 348                return 0;
 349        }
 350
 351        while (n) {
 352                n--;
 353
 354                if (!cur_g ||
 355                    !oideq(&oids[n], &cur_g->oid) ||
 356                    !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) {
 357                        warning(_("commit-graph chain does not match"));
 358                        return 0;
 359                }
 360
 361                cur_g = cur_g->base_graph;
 362        }
 363
 364        g->base_graph = chain;
 365
 366        if (chain)
 367                g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
 368
 369        return 1;
 370}
 371
 372static struct commit_graph *load_commit_graph_chain(struct repository *r, const char *obj_dir)
 373{
 374        struct commit_graph *graph_chain = NULL;
 375        struct strbuf line = STRBUF_INIT;
 376        struct stat st;
 377        struct object_id *oids;
 378        int i = 0, valid = 1, count;
 379        char *chain_name = get_chain_filename(obj_dir);
 380        FILE *fp;
 381        int stat_res;
 382
 383        fp = fopen(chain_name, "r");
 384        stat_res = stat(chain_name, &st);
 385        free(chain_name);
 386
 387        if (!fp ||
 388            stat_res ||
 389            st.st_size <= the_hash_algo->hexsz)
 390                return NULL;
 391
 392        count = st.st_size / (the_hash_algo->hexsz + 1);
 393        oids = xcalloc(count, sizeof(struct object_id));
 394
 395        prepare_alt_odb(r);
 396
 397        for (i = 0; i < count; i++) {
 398                struct object_directory *odb;
 399
 400                if (strbuf_getline_lf(&line, fp) == EOF)
 401                        break;
 402
 403                if (get_oid_hex(line.buf, &oids[i])) {
 404                        warning(_("invalid commit-graph chain: line '%s' not a hash"),
 405                                line.buf);
 406                        valid = 0;
 407                        break;
 408                }
 409
 410                valid = 0;
 411                for (odb = r->objects->odb; odb; odb = odb->next) {
 412                        char *graph_name = get_split_graph_filename(odb->path, line.buf);
 413                        struct commit_graph *g = load_commit_graph_one(graph_name);
 414
 415                        free(graph_name);
 416
 417                        if (g) {
 418                                g->obj_dir = odb->path;
 419
 420                                if (add_graph_to_chain(g, graph_chain, oids, i)) {
 421                                        graph_chain = g;
 422                                        valid = 1;
 423                                }
 424
 425                                break;
 426                        }
 427                }
 428
 429                if (!valid) {
 430                        warning(_("unable to find all commit-graph files"));
 431                        break;
 432                }
 433        }
 434
 435        free(oids);
 436        fclose(fp);
 437
 438        return graph_chain;
 439}
 440
 441struct commit_graph *read_commit_graph_one(struct repository *r, const char *obj_dir)
 442{
 443        struct commit_graph *g = load_commit_graph_v1(r, obj_dir);
 444
 445        if (!g)
 446                g = load_commit_graph_chain(r, obj_dir);
 447
 448        return g;
 449}
 450
 451static void prepare_commit_graph_one(struct repository *r, const char *obj_dir)
 452{
 453
 454        if (r->objects->commit_graph)
 455                return;
 456
 457        r->objects->commit_graph = read_commit_graph_one(r, obj_dir);
 458}
 459
 460/*
 461 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
 462 *
 463 * On the first invocation, this function attemps to load the commit
 464 * graph if the_repository is configured to have one.
 465 */
 466static int prepare_commit_graph(struct repository *r)
 467{
 468        struct object_directory *odb;
 469        int config_value;
 470
 471        if (git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD, 0))
 472                die("dying as requested by the '%s' variable on commit-graph load!",
 473                    GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD);
 474
 475        if (r->objects->commit_graph_attempted)
 476                return !!r->objects->commit_graph;
 477        r->objects->commit_graph_attempted = 1;
 478
 479        if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) &&
 480            (repo_config_get_bool(r, "core.commitgraph", &config_value) ||
 481            !config_value))
 482                /*
 483                 * This repository is not configured to use commit graphs, so
 484                 * do not load one. (But report commit_graph_attempted anyway
 485                 * so that commit graph loading is not attempted again for this
 486                 * repository.)
 487                 */
 488                return 0;
 489
 490        if (!commit_graph_compatible(r))
 491                return 0;
 492
 493        prepare_alt_odb(r);
 494        for (odb = r->objects->odb;
 495             !r->objects->commit_graph && odb;
 496             odb = odb->next)
 497                prepare_commit_graph_one(r, odb->path);
 498        return !!r->objects->commit_graph;
 499}
 500
 501int generation_numbers_enabled(struct repository *r)
 502{
 503        uint32_t first_generation;
 504        struct commit_graph *g;
 505        if (!prepare_commit_graph(r))
 506               return 0;
 507
 508        g = r->objects->commit_graph;
 509
 510        if (!g->num_commits)
 511                return 0;
 512
 513        first_generation = get_be32(g->chunk_commit_data +
 514                                    g->hash_len + 8) >> 2;
 515
 516        return !!first_generation;
 517}
 518
 519static void close_commit_graph_one(struct commit_graph *g)
 520{
 521        if (!g)
 522                return;
 523
 524        close_commit_graph_one(g->base_graph);
 525        free_commit_graph(g);
 526}
 527
 528void close_commit_graph(struct raw_object_store *o)
 529{
 530        close_commit_graph_one(o->commit_graph);
 531        o->commit_graph = NULL;
 532}
 533
 534static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
 535{
 536        return bsearch_hash(oid->hash, g->chunk_oid_fanout,
 537                            g->chunk_oid_lookup, g->hash_len, pos);
 538}
 539
 540static void load_oid_from_graph(struct commit_graph *g,
 541                                uint32_t pos,
 542                                struct object_id *oid)
 543{
 544        uint32_t lex_index;
 545
 546        while (g && pos < g->num_commits_in_base)
 547                g = g->base_graph;
 548
 549        if (!g)
 550                BUG("NULL commit-graph");
 551
 552        if (pos >= g->num_commits + g->num_commits_in_base)
 553                die(_("invalid commit position. commit-graph is likely corrupt"));
 554
 555        lex_index = pos - g->num_commits_in_base;
 556
 557        hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index);
 558}
 559
 560static struct commit_list **insert_parent_or_die(struct repository *r,
 561                                                 struct commit_graph *g,
 562                                                 uint32_t pos,
 563                                                 struct commit_list **pptr)
 564{
 565        struct commit *c;
 566        struct object_id oid;
 567
 568        if (pos >= g->num_commits + g->num_commits_in_base)
 569                die("invalid parent position %"PRIu32, pos);
 570
 571        load_oid_from_graph(g, pos, &oid);
 572        c = lookup_commit(r, &oid);
 573        if (!c)
 574                die(_("could not find commit %s"), oid_to_hex(&oid));
 575        c->graph_pos = pos;
 576        return &commit_list_insert(c, pptr)->next;
 577}
 578
 579static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
 580{
 581        const unsigned char *commit_data;
 582        uint32_t lex_index;
 583
 584        while (pos < g->num_commits_in_base)
 585                g = g->base_graph;
 586
 587        lex_index = pos - g->num_commits_in_base;
 588        commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index;
 589        item->graph_pos = pos;
 590        item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
 591}
 592
 593static inline void set_commit_tree(struct commit *c, struct tree *t)
 594{
 595        c->maybe_tree = t;
 596}
 597
 598static int fill_commit_in_graph(struct repository *r,
 599                                struct commit *item,
 600                                struct commit_graph *g, uint32_t pos)
 601{
 602        uint32_t edge_value;
 603        uint32_t *parent_data_ptr;
 604        uint64_t date_low, date_high;
 605        struct commit_list **pptr;
 606        const unsigned char *commit_data;
 607        uint32_t lex_index;
 608
 609        while (pos < g->num_commits_in_base)
 610                g = g->base_graph;
 611
 612        if (pos >= g->num_commits + g->num_commits_in_base)
 613                die(_("invalid commit position. commit-graph is likely corrupt"));
 614
 615        /*
 616         * Store the "full" position, but then use the
 617         * "local" position for the rest of the calculation.
 618         */
 619        item->graph_pos = pos;
 620        lex_index = pos - g->num_commits_in_base;
 621
 622        commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index;
 623
 624        item->object.parsed = 1;
 625
 626        set_commit_tree(item, NULL);
 627
 628        date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
 629        date_low = get_be32(commit_data + g->hash_len + 12);
 630        item->date = (timestamp_t)((date_high << 32) | date_low);
 631
 632        item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
 633
 634        pptr = &item->parents;
 635
 636        edge_value = get_be32(commit_data + g->hash_len);
 637        if (edge_value == GRAPH_PARENT_NONE)
 638                return 1;
 639        pptr = insert_parent_or_die(r, g, edge_value, pptr);
 640
 641        edge_value = get_be32(commit_data + g->hash_len + 4);
 642        if (edge_value == GRAPH_PARENT_NONE)
 643                return 1;
 644        if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
 645                pptr = insert_parent_or_die(r, g, edge_value, pptr);
 646                return 1;
 647        }
 648
 649        parent_data_ptr = (uint32_t*)(g->chunk_extra_edges +
 650                          4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK));
 651        do {
 652                edge_value = get_be32(parent_data_ptr);
 653                pptr = insert_parent_or_die(r, g,
 654                                            edge_value & GRAPH_EDGE_LAST_MASK,
 655                                            pptr);
 656                parent_data_ptr++;
 657        } while (!(edge_value & GRAPH_LAST_EDGE));
 658
 659        return 1;
 660}
 661
 662static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
 663{
 664        if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
 665                *pos = item->graph_pos;
 666                return 1;
 667        } else {
 668                struct commit_graph *cur_g = g;
 669                uint32_t lex_index;
 670
 671                while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index))
 672                        cur_g = cur_g->base_graph;
 673
 674                if (cur_g) {
 675                        *pos = lex_index + cur_g->num_commits_in_base;
 676                        return 1;
 677                }
 678
 679                return 0;
 680        }
 681}
 682
 683static int parse_commit_in_graph_one(struct repository *r,
 684                                     struct commit_graph *g,
 685                                     struct commit *item)
 686{
 687        uint32_t pos;
 688
 689        if (item->object.parsed)
 690                return 1;
 691
 692        if (find_commit_in_graph(item, g, &pos))
 693                return fill_commit_in_graph(r, item, g, pos);
 694
 695        return 0;
 696}
 697
 698int parse_commit_in_graph(struct repository *r, struct commit *item)
 699{
 700        if (!prepare_commit_graph(r))
 701                return 0;
 702        return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
 703}
 704
 705void load_commit_graph_info(struct repository *r, struct commit *item)
 706{
 707        uint32_t pos;
 708        if (!prepare_commit_graph(r))
 709                return;
 710        if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
 711                fill_commit_graph_info(item, r->objects->commit_graph, pos);
 712}
 713
 714static struct tree *load_tree_for_commit(struct repository *r,
 715                                         struct commit_graph *g,
 716                                         struct commit *c)
 717{
 718        struct object_id oid;
 719        const unsigned char *commit_data;
 720
 721        while (c->graph_pos < g->num_commits_in_base)
 722                g = g->base_graph;
 723
 724        commit_data = g->chunk_commit_data +
 725                        GRAPH_DATA_WIDTH * (c->graph_pos - g->num_commits_in_base);
 726
 727        hashcpy(oid.hash, commit_data);
 728        set_commit_tree(c, lookup_tree(r, &oid));
 729
 730        return c->maybe_tree;
 731}
 732
 733static struct tree *get_commit_tree_in_graph_one(struct repository *r,
 734                                                 struct commit_graph *g,
 735                                                 const struct commit *c)
 736{
 737        if (c->maybe_tree)
 738                return c->maybe_tree;
 739        if (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
 740                BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
 741
 742        return load_tree_for_commit(r, g, (struct commit *)c);
 743}
 744
 745struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
 746{
 747        return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
 748}
 749
 750struct packed_commit_list {
 751        struct commit **list;
 752        int nr;
 753        int alloc;
 754};
 755
 756struct packed_oid_list {
 757        struct object_id *list;
 758        int nr;
 759        int alloc;
 760};
 761
 762struct write_commit_graph_context {
 763        struct repository *r;
 764        char *obj_dir;
 765        char *graph_name;
 766        struct packed_oid_list oids;
 767        struct packed_commit_list commits;
 768        int num_extra_edges;
 769        unsigned long approx_nr_objects;
 770        struct progress *progress;
 771        int progress_done;
 772        uint64_t progress_cnt;
 773
 774        char *base_graph_name;
 775        int num_commit_graphs_before;
 776        int num_commit_graphs_after;
 777        char **commit_graph_filenames_before;
 778        char **commit_graph_filenames_after;
 779        char **commit_graph_hash_after;
 780        uint32_t new_num_commits_in_base;
 781        struct commit_graph *new_base_graph;
 782
 783        unsigned append:1,
 784                 report_progress:1,
 785                 split:1,
 786                 check_oids:1;
 787
 788        const struct split_commit_graph_opts *split_opts;
 789};
 790
 791static void write_graph_chunk_fanout(struct hashfile *f,
 792                                     struct write_commit_graph_context *ctx)
 793{
 794        int i, count = 0;
 795        struct commit **list = ctx->commits.list;
 796
 797        /*
 798         * Write the first-level table (the list is sorted,
 799         * but we use a 256-entry lookup to be able to avoid
 800         * having to do eight extra binary search iterations).
 801         */
 802        for (i = 0; i < 256; i++) {
 803                while (count < ctx->commits.nr) {
 804                        if ((*list)->object.oid.hash[0] != i)
 805                                break;
 806                        display_progress(ctx->progress, ++ctx->progress_cnt);
 807                        count++;
 808                        list++;
 809                }
 810
 811                hashwrite_be32(f, count);
 812        }
 813}
 814
 815static void write_graph_chunk_oids(struct hashfile *f, int hash_len,
 816                                   struct write_commit_graph_context *ctx)
 817{
 818        struct commit **list = ctx->commits.list;
 819        int count;
 820        for (count = 0; count < ctx->commits.nr; count++, list++) {
 821                display_progress(ctx->progress, ++ctx->progress_cnt);
 822                hashwrite(f, (*list)->object.oid.hash, (int)hash_len);
 823        }
 824}
 825
 826static const unsigned char *commit_to_sha1(size_t index, void *table)
 827{
 828        struct commit **commits = table;
 829        return commits[index]->object.oid.hash;
 830}
 831
 832static void write_graph_chunk_data(struct hashfile *f, int hash_len,
 833                                   struct write_commit_graph_context *ctx)
 834{
 835        struct commit **list = ctx->commits.list;
 836        struct commit **last = ctx->commits.list + ctx->commits.nr;
 837        uint32_t num_extra_edges = 0;
 838
 839        while (list < last) {
 840                struct commit_list *parent;
 841                int edge_value;
 842                uint32_t packedDate[2];
 843                display_progress(ctx->progress, ++ctx->progress_cnt);
 844
 845                parse_commit_no_graph(*list);
 846                hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len);
 847
 848                parent = (*list)->parents;
 849
 850                if (!parent)
 851                        edge_value = GRAPH_PARENT_NONE;
 852                else {
 853                        edge_value = sha1_pos(parent->item->object.oid.hash,
 854                                              ctx->commits.list,
 855                                              ctx->commits.nr,
 856                                              commit_to_sha1);
 857
 858                        if (edge_value >= 0)
 859                                edge_value += ctx->new_num_commits_in_base;
 860                        else {
 861                                uint32_t pos;
 862                                if (find_commit_in_graph(parent->item,
 863                                                         ctx->new_base_graph,
 864                                                         &pos))
 865                                        edge_value = pos;
 866                        }
 867
 868                        if (edge_value < 0)
 869                                BUG("missing parent %s for commit %s",
 870                                    oid_to_hex(&parent->item->object.oid),
 871                                    oid_to_hex(&(*list)->object.oid));
 872                }
 873
 874                hashwrite_be32(f, edge_value);
 875
 876                if (parent)
 877                        parent = parent->next;
 878
 879                if (!parent)
 880                        edge_value = GRAPH_PARENT_NONE;
 881                else if (parent->next)
 882                        edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges;
 883                else {
 884                        edge_value = sha1_pos(parent->item->object.oid.hash,
 885                                              ctx->commits.list,
 886                                              ctx->commits.nr,
 887                                              commit_to_sha1);
 888
 889                        if (edge_value >= 0)
 890                                edge_value += ctx->new_num_commits_in_base;
 891                        else {
 892                                uint32_t pos;
 893                                if (find_commit_in_graph(parent->item,
 894                                                         ctx->new_base_graph,
 895                                                         &pos))
 896                                        edge_value = pos;
 897                        }
 898
 899                        if (edge_value < 0)
 900                                BUG("missing parent %s for commit %s",
 901                                    oid_to_hex(&parent->item->object.oid),
 902                                    oid_to_hex(&(*list)->object.oid));
 903                }
 904
 905                hashwrite_be32(f, edge_value);
 906
 907                if (edge_value & GRAPH_EXTRA_EDGES_NEEDED) {
 908                        do {
 909                                num_extra_edges++;
 910                                parent = parent->next;
 911                        } while (parent);
 912                }
 913
 914                if (sizeof((*list)->date) > 4)
 915                        packedDate[0] = htonl(((*list)->date >> 32) & 0x3);
 916                else
 917                        packedDate[0] = 0;
 918
 919                packedDate[0] |= htonl((*list)->generation << 2);
 920
 921                packedDate[1] = htonl((*list)->date);
 922                hashwrite(f, packedDate, 8);
 923
 924                list++;
 925        }
 926}
 927
 928static void write_graph_chunk_extra_edges(struct hashfile *f,
 929                                          struct write_commit_graph_context *ctx)
 930{
 931        struct commit **list = ctx->commits.list;
 932        struct commit **last = ctx->commits.list + ctx->commits.nr;
 933        struct commit_list *parent;
 934
 935        while (list < last) {
 936                int num_parents = 0;
 937
 938                display_progress(ctx->progress, ++ctx->progress_cnt);
 939
 940                for (parent = (*list)->parents; num_parents < 3 && parent;
 941                     parent = parent->next)
 942                        num_parents++;
 943
 944                if (num_parents <= 2) {
 945                        list++;
 946                        continue;
 947                }
 948
 949                /* Since num_parents > 2, this initializer is safe. */
 950                for (parent = (*list)->parents->next; parent; parent = parent->next) {
 951                        int edge_value = sha1_pos(parent->item->object.oid.hash,
 952                                                  ctx->commits.list,
 953                                                  ctx->commits.nr,
 954                                                  commit_to_sha1);
 955
 956                        if (edge_value >= 0)
 957                                edge_value += ctx->new_num_commits_in_base;
 958                        else {
 959                                uint32_t pos;
 960                                if (find_commit_in_graph(parent->item,
 961                                                         ctx->new_base_graph,
 962                                                         &pos))
 963                                        edge_value = pos;
 964                        }
 965
 966                        if (edge_value < 0)
 967                                BUG("missing parent %s for commit %s",
 968                                    oid_to_hex(&parent->item->object.oid),
 969                                    oid_to_hex(&(*list)->object.oid));
 970                        else if (!parent->next)
 971                                edge_value |= GRAPH_LAST_EDGE;
 972
 973                        hashwrite_be32(f, edge_value);
 974                }
 975
 976                list++;
 977        }
 978}
 979
 980static int oid_compare(const void *_a, const void *_b)
 981{
 982        const struct object_id *a = (const struct object_id *)_a;
 983        const struct object_id *b = (const struct object_id *)_b;
 984        return oidcmp(a, b);
 985}
 986
 987static int add_packed_commits(const struct object_id *oid,
 988                              struct packed_git *pack,
 989                              uint32_t pos,
 990                              void *data)
 991{
 992        struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data;
 993        enum object_type type;
 994        off_t offset = nth_packed_object_offset(pack, pos);
 995        struct object_info oi = OBJECT_INFO_INIT;
 996
 997        if (ctx->progress)
 998                display_progress(ctx->progress, ++ctx->progress_done);
 999
1000        oi.typep = &type;
1001        if (packed_object_info(ctx->r, pack, offset, &oi) < 0)
1002                die(_("unable to get type of object %s"), oid_to_hex(oid));
1003
1004        if (type != OBJ_COMMIT)
1005                return 0;
1006
1007        ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1008        oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
1009        ctx->oids.nr++;
1010
1011        return 0;
1012}
1013
1014static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
1015{
1016        struct commit_list *parent;
1017        for (parent = commit->parents; parent; parent = parent->next) {
1018                if (!(parent->item->object.flags & UNINTERESTING)) {
1019                        ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1020                        oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
1021                        ctx->oids.nr++;
1022                        parent->item->object.flags |= UNINTERESTING;
1023                }
1024        }
1025}
1026
1027static void close_reachable(struct write_commit_graph_context *ctx)
1028{
1029        int i;
1030        struct commit *commit;
1031
1032        if (ctx->report_progress)
1033                ctx->progress = start_delayed_progress(
1034                                        _("Loading known commits in commit graph"),
1035                                        ctx->oids.nr);
1036        for (i = 0; i < ctx->oids.nr; i++) {
1037                display_progress(ctx->progress, i + 1);
1038                commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1039                if (commit)
1040                        commit->object.flags |= UNINTERESTING;
1041        }
1042        stop_progress(&ctx->progress);
1043
1044        /*
1045         * As this loop runs, ctx->oids.nr may grow, but not more
1046         * than the number of missing commits in the reachable
1047         * closure.
1048         */
1049        if (ctx->report_progress)
1050                ctx->progress = start_delayed_progress(
1051                                        _("Expanding reachable commits in commit graph"),
1052                                        ctx->oids.nr);
1053        for (i = 0; i < ctx->oids.nr; i++) {
1054                display_progress(ctx->progress, i + 1);
1055                commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1056
1057                if (!commit)
1058                        continue;
1059                if (ctx->split) {
1060                        if (!parse_commit(commit) &&
1061                            commit->graph_pos == COMMIT_NOT_FROM_GRAPH)
1062                                add_missing_parents(ctx, commit);
1063                } else if (!parse_commit_no_graph(commit))
1064                        add_missing_parents(ctx, commit);
1065        }
1066        stop_progress(&ctx->progress);
1067
1068        if (ctx->report_progress)
1069                ctx->progress = start_delayed_progress(
1070                                        _("Clearing commit marks in commit graph"),
1071                                        ctx->oids.nr);
1072        for (i = 0; i < ctx->oids.nr; i++) {
1073                display_progress(ctx->progress, i + 1);
1074                commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1075
1076                if (commit)
1077                        commit->object.flags &= ~UNINTERESTING;
1078        }
1079        stop_progress(&ctx->progress);
1080}
1081
1082static void compute_generation_numbers(struct write_commit_graph_context *ctx)
1083{
1084        int i;
1085        struct commit_list *list = NULL;
1086
1087        if (ctx->report_progress)
1088                ctx->progress = start_progress(
1089                                        _("Computing commit graph generation numbers"),
1090                                        ctx->commits.nr);
1091        for (i = 0; i < ctx->commits.nr; i++) {
1092                display_progress(ctx->progress, i + 1);
1093                if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY &&
1094                    ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO)
1095                        continue;
1096
1097                commit_list_insert(ctx->commits.list[i], &list);
1098                while (list) {
1099                        struct commit *current = list->item;
1100                        struct commit_list *parent;
1101                        int all_parents_computed = 1;
1102                        uint32_t max_generation = 0;
1103
1104                        for (parent = current->parents; parent; parent = parent->next) {
1105                                if (parent->item->generation == GENERATION_NUMBER_INFINITY ||
1106                                    parent->item->generation == GENERATION_NUMBER_ZERO) {
1107                                        all_parents_computed = 0;
1108                                        commit_list_insert(parent->item, &list);
1109                                        break;
1110                                } else if (parent->item->generation > max_generation) {
1111                                        max_generation = parent->item->generation;
1112                                }
1113                        }
1114
1115                        if (all_parents_computed) {
1116                                current->generation = max_generation + 1;
1117                                pop_commit(&list);
1118
1119                                if (current->generation > GENERATION_NUMBER_MAX)
1120                                        current->generation = GENERATION_NUMBER_MAX;
1121                        }
1122                }
1123        }
1124        stop_progress(&ctx->progress);
1125}
1126
1127static int add_ref_to_list(const char *refname,
1128                           const struct object_id *oid,
1129                           int flags, void *cb_data)
1130{
1131        struct string_list *list = (struct string_list *)cb_data;
1132
1133        string_list_append(list, oid_to_hex(oid));
1134        return 0;
1135}
1136
1137int write_commit_graph_reachable(const char *obj_dir,
1138                                 enum commit_graph_write_flags flags,
1139                                 const struct split_commit_graph_opts *split_opts)
1140{
1141        struct string_list list = STRING_LIST_INIT_DUP;
1142        int result;
1143
1144        for_each_ref(add_ref_to_list, &list);
1145        result = write_commit_graph(obj_dir, NULL, &list,
1146                                    flags, split_opts);
1147
1148        string_list_clear(&list, 0);
1149        return result;
1150}
1151
1152static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
1153                                struct string_list *pack_indexes)
1154{
1155        uint32_t i;
1156        struct strbuf progress_title = STRBUF_INIT;
1157        struct strbuf packname = STRBUF_INIT;
1158        int dirlen;
1159
1160        strbuf_addf(&packname, "%s/pack/", ctx->obj_dir);
1161        dirlen = packname.len;
1162        if (ctx->report_progress) {
1163                strbuf_addf(&progress_title,
1164                            Q_("Finding commits for commit graph in %d pack",
1165                               "Finding commits for commit graph in %d packs",
1166                               pack_indexes->nr),
1167                            pack_indexes->nr);
1168                ctx->progress = start_delayed_progress(progress_title.buf, 0);
1169                ctx->progress_done = 0;
1170        }
1171        for (i = 0; i < pack_indexes->nr; i++) {
1172                struct packed_git *p;
1173                strbuf_setlen(&packname, dirlen);
1174                strbuf_addstr(&packname, pack_indexes->items[i].string);
1175                p = add_packed_git(packname.buf, packname.len, 1);
1176                if (!p) {
1177                        error(_("error adding pack %s"), packname.buf);
1178                        return -1;
1179                }
1180                if (open_pack_index(p)) {
1181                        error(_("error opening index for %s"), packname.buf);
1182                        return -1;
1183                }
1184                for_each_object_in_pack(p, add_packed_commits, ctx,
1185                                        FOR_EACH_OBJECT_PACK_ORDER);
1186                close_pack(p);
1187                free(p);
1188        }
1189
1190        stop_progress(&ctx->progress);
1191        strbuf_reset(&progress_title);
1192        strbuf_release(&packname);
1193
1194        return 0;
1195}
1196
1197static int fill_oids_from_commit_hex(struct write_commit_graph_context *ctx,
1198                                     struct string_list *commit_hex)
1199{
1200        uint32_t i;
1201        struct strbuf progress_title = STRBUF_INIT;
1202
1203        if (ctx->report_progress) {
1204                strbuf_addf(&progress_title,
1205                            Q_("Finding commits for commit graph from %d ref",
1206                               "Finding commits for commit graph from %d refs",
1207                               commit_hex->nr),
1208                            commit_hex->nr);
1209                ctx->progress = start_delayed_progress(
1210                                        progress_title.buf,
1211                                        commit_hex->nr);
1212        }
1213        for (i = 0; i < commit_hex->nr; i++) {
1214                const char *end;
1215                struct object_id oid;
1216                struct commit *result;
1217
1218                display_progress(ctx->progress, i + 1);
1219                if (!parse_oid_hex(commit_hex->items[i].string, &oid, &end) &&
1220                    (result = lookup_commit_reference_gently(ctx->r, &oid, 1))) {
1221                        ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1222                        oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid));
1223                        ctx->oids.nr++;
1224                } else if (ctx->check_oids) {
1225                        error(_("invalid commit object id: %s"),
1226                            commit_hex->items[i].string);
1227                        return -1;
1228                }
1229        }
1230        stop_progress(&ctx->progress);
1231        strbuf_release(&progress_title);
1232
1233        return 0;
1234}
1235
1236static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
1237{
1238        if (ctx->report_progress)
1239                ctx->progress = start_delayed_progress(
1240                        _("Finding commits for commit graph among packed objects"),
1241                        ctx->approx_nr_objects);
1242        for_each_packed_object(add_packed_commits, ctx,
1243                               FOR_EACH_OBJECT_PACK_ORDER);
1244        if (ctx->progress_done < ctx->approx_nr_objects)
1245                display_progress(ctx->progress, ctx->approx_nr_objects);
1246        stop_progress(&ctx->progress);
1247}
1248
1249static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
1250{
1251        uint32_t i, count_distinct = 1;
1252
1253        if (ctx->report_progress)
1254                ctx->progress = start_delayed_progress(
1255                        _("Counting distinct commits in commit graph"),
1256                        ctx->oids.nr);
1257        display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
1258        QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
1259
1260        for (i = 1; i < ctx->oids.nr; i++) {
1261                display_progress(ctx->progress, i + 1);
1262                if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) {
1263                        if (ctx->split) {
1264                                struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]);
1265
1266                                if (!c || c->graph_pos != COMMIT_NOT_FROM_GRAPH)
1267                                        continue;
1268                        }
1269
1270                        count_distinct++;
1271                }
1272        }
1273        stop_progress(&ctx->progress);
1274
1275        return count_distinct;
1276}
1277
1278static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
1279{
1280        uint32_t i;
1281        struct commit_list *parent;
1282
1283        ctx->num_extra_edges = 0;
1284        if (ctx->report_progress)
1285                ctx->progress = start_delayed_progress(
1286                        _("Finding extra edges in commit graph"),
1287                        ctx->oids.nr);
1288        for (i = 0; i < ctx->oids.nr; i++) {
1289                int num_parents = 0;
1290                display_progress(ctx->progress, i + 1);
1291                if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
1292                        continue;
1293
1294                ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
1295                ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
1296
1297                if (ctx->split &&
1298                    ctx->commits.list[ctx->commits.nr]->graph_pos != COMMIT_NOT_FROM_GRAPH)
1299                        continue;
1300
1301                parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
1302
1303                for (parent = ctx->commits.list[ctx->commits.nr]->parents;
1304                     parent; parent = parent->next)
1305                        num_parents++;
1306
1307                if (num_parents > 2)
1308                        ctx->num_extra_edges += num_parents - 1;
1309
1310                ctx->commits.nr++;
1311        }
1312        stop_progress(&ctx->progress);
1313}
1314
1315static int write_graph_chunk_base_1(struct hashfile *f,
1316                                    struct commit_graph *g)
1317{
1318        int num = 0;
1319
1320        if (!g)
1321                return 0;
1322
1323        num = write_graph_chunk_base_1(f, g->base_graph);
1324        hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
1325        return num + 1;
1326}
1327
1328static int write_graph_chunk_base(struct hashfile *f,
1329                                  struct write_commit_graph_context *ctx)
1330{
1331        int num = write_graph_chunk_base_1(f, ctx->new_base_graph);
1332
1333        if (num != ctx->num_commit_graphs_after - 1) {
1334                error(_("failed to write correct number of base graph ids"));
1335                return -1;
1336        }
1337
1338        return 0;
1339}
1340
1341static int write_commit_graph_file(struct write_commit_graph_context *ctx)
1342{
1343        uint32_t i;
1344        int fd;
1345        struct hashfile *f;
1346        struct lock_file lk = LOCK_INIT;
1347        uint32_t chunk_ids[6];
1348        uint64_t chunk_offsets[6];
1349        const unsigned hashsz = the_hash_algo->rawsz;
1350        struct strbuf progress_title = STRBUF_INIT;
1351        int num_chunks = 3;
1352        struct object_id file_hash;
1353
1354        if (ctx->split) {
1355                struct strbuf tmp_file = STRBUF_INIT;
1356
1357                strbuf_addf(&tmp_file,
1358                            "%s/info/commit-graphs/tmp_graph_XXXXXX",
1359                            ctx->obj_dir);
1360                ctx->graph_name = strbuf_detach(&tmp_file, NULL);
1361        } else {
1362                ctx->graph_name = get_commit_graph_filename(ctx->obj_dir);
1363        }
1364
1365        if (safe_create_leading_directories(ctx->graph_name)) {
1366                UNLEAK(ctx->graph_name);
1367                error(_("unable to create leading directories of %s"),
1368                        ctx->graph_name);
1369                return -1;
1370        }
1371
1372        if (ctx->split) {
1373                char *lock_name = get_chain_filename(ctx->obj_dir);
1374
1375                hold_lock_file_for_update(&lk, lock_name, LOCK_DIE_ON_ERROR);
1376
1377                fd = git_mkstemp_mode(ctx->graph_name, 0444);
1378                if (fd < 0) {
1379                        error(_("unable to create '%s'"), ctx->graph_name);
1380                        return -1;
1381                }
1382
1383                f = hashfd(fd, ctx->graph_name);
1384        } else {
1385                hold_lock_file_for_update(&lk, ctx->graph_name, LOCK_DIE_ON_ERROR);
1386                fd = lk.tempfile->fd;
1387                f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
1388        }
1389
1390        chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT;
1391        chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP;
1392        chunk_ids[2] = GRAPH_CHUNKID_DATA;
1393        if (ctx->num_extra_edges) {
1394                chunk_ids[num_chunks] = GRAPH_CHUNKID_EXTRAEDGES;
1395                num_chunks++;
1396        }
1397        if (ctx->num_commit_graphs_after > 1) {
1398                chunk_ids[num_chunks] = GRAPH_CHUNKID_BASE;
1399                num_chunks++;
1400        }
1401
1402        chunk_ids[num_chunks] = 0;
1403
1404        chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
1405        chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE;
1406        chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr;
1407        chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr;
1408
1409        num_chunks = 3;
1410        if (ctx->num_extra_edges) {
1411                chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1412                                                4 * ctx->num_extra_edges;
1413                num_chunks++;
1414        }
1415        if (ctx->num_commit_graphs_after > 1) {
1416                chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1417                                                hashsz * (ctx->num_commit_graphs_after - 1);
1418                num_chunks++;
1419        }
1420
1421        hashwrite_be32(f, GRAPH_SIGNATURE);
1422
1423        hashwrite_u8(f, GRAPH_VERSION);
1424        hashwrite_u8(f, oid_version());
1425        hashwrite_u8(f, num_chunks);
1426        hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
1427
1428        for (i = 0; i <= num_chunks; i++) {
1429                uint32_t chunk_write[3];
1430
1431                chunk_write[0] = htonl(chunk_ids[i]);
1432                chunk_write[1] = htonl(chunk_offsets[i] >> 32);
1433                chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff);
1434                hashwrite(f, chunk_write, 12);
1435        }
1436
1437        if (ctx->report_progress) {
1438                strbuf_addf(&progress_title,
1439                            Q_("Writing out commit graph in %d pass",
1440                               "Writing out commit graph in %d passes",
1441                               num_chunks),
1442                            num_chunks);
1443                ctx->progress = start_delayed_progress(
1444                        progress_title.buf,
1445                        num_chunks * ctx->commits.nr);
1446        }
1447        write_graph_chunk_fanout(f, ctx);
1448        write_graph_chunk_oids(f, hashsz, ctx);
1449        write_graph_chunk_data(f, hashsz, ctx);
1450        if (ctx->num_extra_edges)
1451                write_graph_chunk_extra_edges(f, ctx);
1452        if (ctx->num_commit_graphs_after > 1 &&
1453            write_graph_chunk_base(f, ctx)) {
1454                return -1;
1455        }
1456        stop_progress(&ctx->progress);
1457        strbuf_release(&progress_title);
1458
1459        if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) {
1460                char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid));
1461                char *new_base_name = get_split_graph_filename(ctx->new_base_graph->obj_dir, new_base_hash);
1462
1463                free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]);
1464                free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]);
1465                ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name;
1466                ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash;
1467        }
1468
1469        close_commit_graph(ctx->r->objects);
1470        finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
1471
1472        if (ctx->split) {
1473                FILE *chainf = fdopen_lock_file(&lk, "w");
1474                char *final_graph_name;
1475                int result;
1476
1477                close(fd);
1478
1479                if (!chainf) {
1480                        error(_("unable to open commit-graph chain file"));
1481                        return -1;
1482                }
1483
1484                if (ctx->base_graph_name) {
1485                        const char *dest = ctx->commit_graph_filenames_after[
1486                                                ctx->num_commit_graphs_after - 2];
1487
1488                        if (strcmp(ctx->base_graph_name, dest)) {
1489                                result = rename(ctx->base_graph_name, dest);
1490
1491                                if (result) {
1492                                        error(_("failed to rename base commit-graph file"));
1493                                        return -1;
1494                                }
1495                        }
1496                } else {
1497                        char *graph_name = get_commit_graph_filename(ctx->obj_dir);
1498                        unlink(graph_name);
1499                }
1500
1501                ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash));
1502                final_graph_name = get_split_graph_filename(ctx->obj_dir,
1503                                        ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
1504                ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name;
1505
1506                result = rename(ctx->graph_name, final_graph_name);
1507
1508                for (i = 0; i < ctx->num_commit_graphs_after; i++)
1509                        fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]);
1510
1511                if (result) {
1512                        error(_("failed to rename temporary commit-graph file"));
1513                        return -1;
1514                }
1515        }
1516
1517        commit_lock_file(&lk);
1518
1519        return 0;
1520}
1521
1522static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
1523{
1524        struct commit_graph *g = ctx->r->objects->commit_graph;
1525        uint32_t num_commits = ctx->commits.nr;
1526        uint32_t i;
1527
1528        int max_commits = 0;
1529        int size_mult = 2;
1530
1531        if (ctx->split_opts) {
1532                max_commits = ctx->split_opts->max_commits;
1533                size_mult = ctx->split_opts->size_multiple;
1534        }
1535
1536        g = ctx->r->objects->commit_graph;
1537        ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
1538
1539        while (g && (g->num_commits <= size_mult * num_commits ||
1540                    (max_commits && num_commits > max_commits))) {
1541                if (strcmp(g->obj_dir, ctx->obj_dir))
1542                        break;
1543
1544                num_commits += g->num_commits;
1545                g = g->base_graph;
1546
1547                ctx->num_commit_graphs_after--;
1548        }
1549
1550        ctx->new_base_graph = g;
1551
1552        if (ctx->num_commit_graphs_after == 2) {
1553                char *old_graph_name = get_commit_graph_filename(g->obj_dir);
1554
1555                if (!strcmp(g->filename, old_graph_name) &&
1556                    strcmp(g->obj_dir, ctx->obj_dir)) {
1557                        ctx->num_commit_graphs_after = 1;
1558                        ctx->new_base_graph = NULL;
1559                }
1560
1561                free(old_graph_name);
1562        }
1563
1564        ALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
1565        ALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after);
1566
1567        for (i = 0; i < ctx->num_commit_graphs_after &&
1568                    i < ctx->num_commit_graphs_before; i++)
1569                ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]);
1570
1571        i = ctx->num_commit_graphs_before - 1;
1572        g = ctx->r->objects->commit_graph;
1573
1574        while (g) {
1575                if (i < ctx->num_commit_graphs_after)
1576                        ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid));
1577
1578                i--;
1579                g = g->base_graph;
1580        }
1581}
1582
1583static void merge_commit_graph(struct write_commit_graph_context *ctx,
1584                               struct commit_graph *g)
1585{
1586        uint32_t i;
1587        uint32_t offset = g->num_commits_in_base;
1588
1589        ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
1590
1591        for (i = 0; i < g->num_commits; i++) {
1592                struct object_id oid;
1593                struct commit *result;
1594
1595                display_progress(ctx->progress, i + 1);
1596
1597                load_oid_from_graph(g, i + offset, &oid);
1598
1599                /* only add commits if they still exist in the repo */
1600                result = lookup_commit_reference_gently(ctx->r, &oid, 1);
1601
1602                if (result) {
1603                        ctx->commits.list[ctx->commits.nr] = result;
1604                        ctx->commits.nr++;
1605                }
1606        }
1607}
1608
1609static int commit_compare(const void *_a, const void *_b)
1610{
1611        const struct commit *a = *(const struct commit **)_a;
1612        const struct commit *b = *(const struct commit **)_b;
1613        return oidcmp(&a->object.oid, &b->object.oid);
1614}
1615
1616static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
1617{
1618        uint32_t i, num_parents;
1619        struct commit_list *parent;
1620
1621        if (ctx->report_progress)
1622                ctx->progress = start_delayed_progress(
1623                                        _("Scanning merged commits"),
1624                                        ctx->commits.nr);
1625
1626        QSORT(ctx->commits.list, ctx->commits.nr, commit_compare);
1627
1628        ctx->num_extra_edges = 0;
1629        for (i = 0; i < ctx->commits.nr; i++) {
1630                display_progress(ctx->progress, i);
1631
1632                if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
1633                          &ctx->commits.list[i]->object.oid)) {
1634                        die(_("unexpected duplicate commit id %s"),
1635                            oid_to_hex(&ctx->commits.list[i]->object.oid));
1636                } else {
1637                        num_parents = 0;
1638                        for (parent = ctx->commits.list[i]->parents; parent; parent = parent->next)
1639                                num_parents++;
1640
1641                        if (num_parents > 2)
1642                                ctx->num_extra_edges += num_parents - 2;
1643                }
1644        }
1645
1646        stop_progress(&ctx->progress);
1647}
1648
1649static void merge_commit_graphs(struct write_commit_graph_context *ctx)
1650{
1651        struct commit_graph *g = ctx->r->objects->commit_graph;
1652        uint32_t current_graph_number = ctx->num_commit_graphs_before;
1653        struct strbuf progress_title = STRBUF_INIT;
1654
1655        while (g && current_graph_number >= ctx->num_commit_graphs_after) {
1656                current_graph_number--;
1657
1658                if (ctx->report_progress) {
1659                        strbuf_addstr(&progress_title, _("Merging commit-graph"));
1660                        ctx->progress = start_delayed_progress(progress_title.buf, 0);
1661                }
1662
1663                merge_commit_graph(ctx, g);
1664                stop_progress(&ctx->progress);
1665                strbuf_release(&progress_title);
1666
1667                g = g->base_graph;
1668        }
1669
1670        if (g) {
1671                ctx->new_base_graph = g;
1672                ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base;
1673        }
1674
1675        if (ctx->new_base_graph)
1676                ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename);
1677
1678        sort_and_scan_merged_commits(ctx);
1679}
1680
1681static void mark_commit_graphs(struct write_commit_graph_context *ctx)
1682{
1683        uint32_t i;
1684        time_t now = time(NULL);
1685
1686        for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) {
1687                struct stat st;
1688                struct utimbuf updated_time;
1689
1690                stat(ctx->commit_graph_filenames_before[i], &st);
1691
1692                updated_time.actime = st.st_atime;
1693                updated_time.modtime = now;
1694                utime(ctx->commit_graph_filenames_before[i], &updated_time);
1695        }
1696}
1697
1698static void expire_commit_graphs(struct write_commit_graph_context *ctx)
1699{
1700        struct strbuf path = STRBUF_INIT;
1701        DIR *dir;
1702        struct dirent *de;
1703        size_t dirnamelen;
1704        timestamp_t expire_time = time(NULL);
1705
1706        if (ctx->split_opts && ctx->split_opts->expire_time)
1707                expire_time -= ctx->split_opts->expire_time;
1708        if (!ctx->split) {
1709                char *chain_file_name = get_chain_filename(ctx->obj_dir);
1710                unlink(chain_file_name);
1711                free(chain_file_name);
1712                ctx->num_commit_graphs_after = 0;
1713        }
1714
1715        strbuf_addstr(&path, ctx->obj_dir);
1716        strbuf_addstr(&path, "/info/commit-graphs");
1717        dir = opendir(path.buf);
1718
1719        if (!dir) {
1720                strbuf_release(&path);
1721                return;
1722        }
1723
1724        strbuf_addch(&path, '/');
1725        dirnamelen = path.len;
1726        while ((de = readdir(dir)) != NULL) {
1727                struct stat st;
1728                uint32_t i, found = 0;
1729
1730                strbuf_setlen(&path, dirnamelen);
1731                strbuf_addstr(&path, de->d_name);
1732
1733                stat(path.buf, &st);
1734
1735                if (st.st_mtime > expire_time)
1736                        continue;
1737                if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph"))
1738                        continue;
1739
1740                for (i = 0; i < ctx->num_commit_graphs_after; i++) {
1741                        if (!strcmp(ctx->commit_graph_filenames_after[i],
1742                                    path.buf)) {
1743                                found = 1;
1744                                break;
1745                        }
1746                }
1747
1748                if (!found)
1749                        unlink(path.buf);
1750        }
1751}
1752
1753int write_commit_graph(const char *obj_dir,
1754                       struct string_list *pack_indexes,
1755                       struct string_list *commit_hex,
1756                       enum commit_graph_write_flags flags,
1757                       const struct split_commit_graph_opts *split_opts)
1758{
1759        struct write_commit_graph_context *ctx;
1760        uint32_t i, count_distinct = 0;
1761        size_t len;
1762        int res = 0;
1763
1764        if (!commit_graph_compatible(the_repository))
1765                return 0;
1766
1767        ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
1768        ctx->r = the_repository;
1769
1770        /* normalize object dir with no trailing slash */
1771        ctx->obj_dir = xmallocz(strlen(obj_dir) + 1);
1772        normalize_path_copy(ctx->obj_dir, obj_dir);
1773        len = strlen(ctx->obj_dir);
1774        if (len && ctx->obj_dir[len - 1] == '/')
1775                ctx->obj_dir[len - 1] = 0;
1776
1777        ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
1778        ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
1779        ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
1780        ctx->check_oids = flags & COMMIT_GRAPH_WRITE_CHECK_OIDS ? 1 : 0;
1781        ctx->split_opts = split_opts;
1782
1783        if (ctx->split) {
1784                struct commit_graph *g;
1785                prepare_commit_graph(ctx->r);
1786
1787                g = ctx->r->objects->commit_graph;
1788
1789                while (g) {
1790                        ctx->num_commit_graphs_before++;
1791                        g = g->base_graph;
1792                }
1793
1794                if (ctx->num_commit_graphs_before) {
1795                        ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
1796                        i = ctx->num_commit_graphs_before;
1797                        g = ctx->r->objects->commit_graph;
1798
1799                        while (g) {
1800                                ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
1801                                g = g->base_graph;
1802                        }
1803                }
1804        }
1805
1806        ctx->approx_nr_objects = approximate_object_count();
1807        ctx->oids.alloc = ctx->approx_nr_objects / 32;
1808
1809        if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits)
1810                ctx->oids.alloc = split_opts->max_commits;
1811
1812        if (ctx->append) {
1813                prepare_commit_graph_one(ctx->r, ctx->obj_dir);
1814                if (ctx->r->objects->commit_graph)
1815                        ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
1816        }
1817
1818        if (ctx->oids.alloc < 1024)
1819                ctx->oids.alloc = 1024;
1820        ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
1821
1822        if (ctx->append && ctx->r->objects->commit_graph) {
1823                struct commit_graph *g = ctx->r->objects->commit_graph;
1824                for (i = 0; i < g->num_commits; i++) {
1825                        const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
1826                        hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
1827                }
1828        }
1829
1830        if (pack_indexes) {
1831                if ((res = fill_oids_from_packs(ctx, pack_indexes)))
1832                        goto cleanup;
1833        }
1834
1835        if (commit_hex) {
1836                if ((res = fill_oids_from_commit_hex(ctx, commit_hex)))
1837                        goto cleanup;
1838        }
1839
1840        if (!pack_indexes && !commit_hex)
1841                fill_oids_from_all_packs(ctx);
1842
1843        close_reachable(ctx);
1844
1845        count_distinct = count_distinct_commits(ctx);
1846
1847        if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
1848                error(_("the commit graph format cannot write %d commits"), count_distinct);
1849                res = -1;
1850                goto cleanup;
1851        }
1852
1853        ctx->commits.alloc = count_distinct;
1854        ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
1855
1856        copy_oids_to_commits(ctx);
1857
1858        if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
1859                error(_("too many commits to write graph"));
1860                res = -1;
1861                goto cleanup;
1862        }
1863
1864        if (!ctx->commits.nr)
1865                goto cleanup;
1866
1867        if (ctx->split) {
1868                split_graph_merge_strategy(ctx);
1869
1870                merge_commit_graphs(ctx);
1871        } else
1872                ctx->num_commit_graphs_after = 1;
1873
1874        compute_generation_numbers(ctx);
1875
1876        res = write_commit_graph_file(ctx);
1877
1878        if (ctx->split)
1879                mark_commit_graphs(ctx);
1880
1881        expire_commit_graphs(ctx);
1882
1883cleanup:
1884        free(ctx->graph_name);
1885        free(ctx->commits.list);
1886        free(ctx->oids.list);
1887        free(ctx->obj_dir);
1888
1889        if (ctx->commit_graph_filenames_after) {
1890                for (i = 0; i < ctx->num_commit_graphs_after; i++) {
1891                        free(ctx->commit_graph_filenames_after[i]);
1892                        free(ctx->commit_graph_hash_after[i]);
1893                }
1894
1895                for (i = 0; i < ctx->num_commit_graphs_before; i++)
1896                        free(ctx->commit_graph_filenames_before[i]);
1897
1898                free(ctx->commit_graph_filenames_after);
1899                free(ctx->commit_graph_filenames_before);
1900                free(ctx->commit_graph_hash_after);
1901        }
1902
1903        free(ctx);
1904
1905        return res;
1906}
1907
1908#define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
1909static int verify_commit_graph_error;
1910
1911static void graph_report(const char *fmt, ...)
1912{
1913        va_list ap;
1914
1915        verify_commit_graph_error = 1;
1916        va_start(ap, fmt);
1917        vfprintf(stderr, fmt, ap);
1918        fprintf(stderr, "\n");
1919        va_end(ap);
1920}
1921
1922#define GENERATION_ZERO_EXISTS 1
1923#define GENERATION_NUMBER_EXISTS 2
1924
1925int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
1926{
1927        uint32_t i, cur_fanout_pos = 0;
1928        struct object_id prev_oid, cur_oid, checksum;
1929        int generation_zero = 0;
1930        struct hashfile *f;
1931        int devnull;
1932        struct progress *progress = NULL;
1933        int local_error = 0;
1934
1935        if (!g) {
1936                graph_report("no commit-graph file loaded");
1937                return 1;
1938        }
1939
1940        verify_commit_graph_error = verify_commit_graph_lite(g);
1941        if (verify_commit_graph_error)
1942                return verify_commit_graph_error;
1943
1944        devnull = open("/dev/null", O_WRONLY);
1945        f = hashfd(devnull, NULL);
1946        hashwrite(f, g->data, g->data_len - g->hash_len);
1947        finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
1948        if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
1949                graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
1950                verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
1951        }
1952
1953        for (i = 0; i < g->num_commits; i++) {
1954                struct commit *graph_commit;
1955
1956                hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
1957
1958                if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
1959                        graph_report(_("commit-graph has incorrect OID order: %s then %s"),
1960                                     oid_to_hex(&prev_oid),
1961                                     oid_to_hex(&cur_oid));
1962
1963                oidcpy(&prev_oid, &cur_oid);
1964
1965                while (cur_oid.hash[0] > cur_fanout_pos) {
1966                        uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
1967
1968                        if (i != fanout_value)
1969                                graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
1970                                             cur_fanout_pos, fanout_value, i);
1971                        cur_fanout_pos++;
1972                }
1973
1974                graph_commit = lookup_commit(r, &cur_oid);
1975                if (!parse_commit_in_graph_one(r, g, graph_commit))
1976                        graph_report(_("failed to parse commit %s from commit-graph"),
1977                                     oid_to_hex(&cur_oid));
1978        }
1979
1980        while (cur_fanout_pos < 256) {
1981                uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
1982
1983                if (g->num_commits != fanout_value)
1984                        graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
1985                                     cur_fanout_pos, fanout_value, i);
1986
1987                cur_fanout_pos++;
1988        }
1989
1990        if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
1991                return verify_commit_graph_error;
1992
1993        progress = start_progress(_("Verifying commits in commit graph"),
1994                                  g->num_commits);
1995        for (i = 0; i < g->num_commits; i++) {
1996                struct commit *graph_commit, *odb_commit;
1997                struct commit_list *graph_parents, *odb_parents;
1998                uint32_t max_generation = 0;
1999
2000                display_progress(progress, i + 1);
2001                hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2002
2003                graph_commit = lookup_commit(r, &cur_oid);
2004                odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
2005                if (parse_commit_internal(odb_commit, 0, 0)) {
2006                        graph_report(_("failed to parse commit %s from object database for commit-graph"),
2007                                     oid_to_hex(&cur_oid));
2008                        continue;
2009                }
2010
2011                if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
2012                           get_commit_tree_oid(odb_commit)))
2013                        graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
2014                                     oid_to_hex(&cur_oid),
2015                                     oid_to_hex(get_commit_tree_oid(graph_commit)),
2016                                     oid_to_hex(get_commit_tree_oid(odb_commit)));
2017
2018                graph_parents = graph_commit->parents;
2019                odb_parents = odb_commit->parents;
2020
2021                while (graph_parents) {
2022                        if (odb_parents == NULL) {
2023                                graph_report(_("commit-graph parent list for commit %s is too long"),
2024                                             oid_to_hex(&cur_oid));
2025                                break;
2026                        }
2027
2028                        /* parse parent in case it is in a base graph */
2029                        parse_commit_in_graph_one(r, g, graph_parents->item);
2030
2031                        if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
2032                                graph_report(_("commit-graph parent for %s is %s != %s"),
2033                                             oid_to_hex(&cur_oid),
2034                                             oid_to_hex(&graph_parents->item->object.oid),
2035                                             oid_to_hex(&odb_parents->item->object.oid));
2036
2037                        if (graph_parents->item->generation > max_generation)
2038                                max_generation = graph_parents->item->generation;
2039
2040                        graph_parents = graph_parents->next;
2041                        odb_parents = odb_parents->next;
2042                }
2043
2044                if (odb_parents != NULL)
2045                        graph_report(_("commit-graph parent list for commit %s terminates early"),
2046                                     oid_to_hex(&cur_oid));
2047
2048                if (!graph_commit->generation) {
2049                        if (generation_zero == GENERATION_NUMBER_EXISTS)
2050                                graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
2051                                             oid_to_hex(&cur_oid));
2052                        generation_zero = GENERATION_ZERO_EXISTS;
2053                } else if (generation_zero == GENERATION_ZERO_EXISTS)
2054                        graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
2055                                     oid_to_hex(&cur_oid));
2056
2057                if (generation_zero == GENERATION_ZERO_EXISTS)
2058                        continue;
2059
2060                /*
2061                 * If one of our parents has generation GENERATION_NUMBER_MAX, then
2062                 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
2063                 * extra logic in the following condition.
2064                 */
2065                if (max_generation == GENERATION_NUMBER_MAX)
2066                        max_generation--;
2067
2068                if (graph_commit->generation != max_generation + 1)
2069                        graph_report(_("commit-graph generation for commit %s is %u != %u"),
2070                                     oid_to_hex(&cur_oid),
2071                                     graph_commit->generation,
2072                                     max_generation + 1);
2073
2074                if (graph_commit->date != odb_commit->date)
2075                        graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime),
2076                                     oid_to_hex(&cur_oid),
2077                                     graph_commit->date,
2078                                     odb_commit->date);
2079        }
2080        stop_progress(&progress);
2081
2082        local_error = verify_commit_graph_error;
2083
2084        if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph)
2085                local_error |= verify_commit_graph(r, g->base_graph, flags);
2086
2087        return local_error;
2088}
2089
2090void free_commit_graph(struct commit_graph *g)
2091{
2092        if (!g)
2093                return;
2094        if (g->graph_fd >= 0) {
2095                munmap((void *)g->data, g->data_len);
2096                g->data = NULL;
2097                close(g->graph_fd);
2098        }
2099        free(g->filename);
2100        free(g);
2101}