| #include "cache.h" |
| #include "config.h" |
| #include "dir.h" |
| #include "git-compat-util.h" |
| #include "lockfile.h" |
| #include "pack.h" |
| #include "packfile.h" |
| #include "commit.h" |
| #include "object.h" |
| #include "refs.h" |
| #include "revision.h" |
| #include "sha1-lookup.h" |
| #include "commit-graph.h" |
| #include "object-store.h" |
| #include "alloc.h" |
| #include "hashmap.h" |
| #include "replace-object.h" |
| #include "progress.h" |
| |
| #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */ |
| #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */ |
| #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */ |
| #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */ |
| #define GRAPH_CHUNKID_LARGEEDGES 0x45444745 /* "EDGE" */ |
| |
| #define GRAPH_DATA_WIDTH 36 |
| |
| #define GRAPH_VERSION_1 0x1 |
| #define GRAPH_VERSION GRAPH_VERSION_1 |
| |
| #define GRAPH_OID_VERSION_SHA1 1 |
| #define GRAPH_OID_LEN_SHA1 GIT_SHA1_RAWSZ |
| #define GRAPH_OID_VERSION GRAPH_OID_VERSION_SHA1 |
| #define GRAPH_OID_LEN GRAPH_OID_LEN_SHA1 |
| |
| #define GRAPH_OCTOPUS_EDGES_NEEDED 0x80000000 |
| #define GRAPH_PARENT_MISSING 0x7fffffff |
| #define GRAPH_EDGE_LAST_MASK 0x7fffffff |
| #define GRAPH_PARENT_NONE 0x70000000 |
| |
| #define GRAPH_LAST_EDGE 0x80000000 |
| |
| #define GRAPH_HEADER_SIZE 8 |
| #define GRAPH_FANOUT_SIZE (4 * 256) |
| #define GRAPH_CHUNKLOOKUP_WIDTH 12 |
| #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \ |
| + GRAPH_FANOUT_SIZE + GRAPH_OID_LEN) |
| |
| char *get_commit_graph_filename(const char *obj_dir) |
| { |
| return xstrfmt("%s/info/commit-graph", obj_dir); |
| } |
| |
| static struct commit_graph *alloc_commit_graph(void) |
| { |
| struct commit_graph *g = xcalloc(1, sizeof(*g)); |
| g->graph_fd = -1; |
| |
| return g; |
| } |
| |
| extern int read_replace_refs; |
| |
| static int commit_graph_compatible(struct repository *r) |
| { |
| if (!r->gitdir) |
| return 0; |
| |
| if (read_replace_refs) { |
| prepare_replace_object(r); |
| if (hashmap_get_size(&r->objects->replace_map->map)) |
| return 0; |
| } |
| |
| prepare_commit_graft(r); |
| if (r->parsed_objects && r->parsed_objects->grafts_nr) |
| return 0; |
| if (is_repository_shallow(r)) |
| return 0; |
| |
| return 1; |
| } |
| |
| struct commit_graph *load_commit_graph_one(const char *graph_file) |
| { |
| void *graph_map; |
| const unsigned char *data, *chunk_lookup; |
| size_t graph_size; |
| struct stat st; |
| uint32_t i; |
| struct commit_graph *graph; |
| int fd = git_open(graph_file); |
| uint64_t last_chunk_offset; |
| uint32_t last_chunk_id; |
| uint32_t graph_signature; |
| unsigned char graph_version, hash_version; |
| |
| if (fd < 0) |
| return NULL; |
| if (fstat(fd, &st)) { |
| close(fd); |
| return NULL; |
| } |
| graph_size = xsize_t(st.st_size); |
| |
| if (graph_size < GRAPH_MIN_SIZE) { |
| close(fd); |
| die(_("graph file %s is too small"), graph_file); |
| } |
| graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| data = (const unsigned char *)graph_map; |
| |
| graph_signature = get_be32(data); |
| if (graph_signature != GRAPH_SIGNATURE) { |
| error(_("graph signature %X does not match signature %X"), |
| graph_signature, GRAPH_SIGNATURE); |
| goto cleanup_fail; |
| } |
| |
| graph_version = *(unsigned char*)(data + 4); |
| if (graph_version != GRAPH_VERSION) { |
| error(_("graph version %X does not match version %X"), |
| graph_version, GRAPH_VERSION); |
| goto cleanup_fail; |
| } |
| |
| hash_version = *(unsigned char*)(data + 5); |
| if (hash_version != GRAPH_OID_VERSION) { |
| error(_("hash version %X does not match version %X"), |
| hash_version, GRAPH_OID_VERSION); |
| goto cleanup_fail; |
| } |
| |
| graph = alloc_commit_graph(); |
| |
| graph->hash_len = GRAPH_OID_LEN; |
| graph->num_chunks = *(unsigned char*)(data + 6); |
| graph->graph_fd = fd; |
| graph->data = graph_map; |
| graph->data_len = graph_size; |
| |
| last_chunk_id = 0; |
| last_chunk_offset = 8; |
| chunk_lookup = data + 8; |
| for (i = 0; i < graph->num_chunks; i++) { |
| uint32_t chunk_id = get_be32(chunk_lookup + 0); |
| uint64_t chunk_offset = get_be64(chunk_lookup + 4); |
| int chunk_repeated = 0; |
| |
| chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; |
| |
| if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { |
| error(_("improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32), |
| (uint32_t)chunk_offset); |
| goto cleanup_fail; |
| } |
| |
| switch (chunk_id) { |
| case GRAPH_CHUNKID_OIDFANOUT: |
| if (graph->chunk_oid_fanout) |
| chunk_repeated = 1; |
| else |
| graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset); |
| break; |
| |
| case GRAPH_CHUNKID_OIDLOOKUP: |
| if (graph->chunk_oid_lookup) |
| chunk_repeated = 1; |
| else |
| graph->chunk_oid_lookup = data + chunk_offset; |
| break; |
| |
| case GRAPH_CHUNKID_DATA: |
| if (graph->chunk_commit_data) |
| chunk_repeated = 1; |
| else |
| graph->chunk_commit_data = data + chunk_offset; |
| break; |
| |
| case GRAPH_CHUNKID_LARGEEDGES: |
| if (graph->chunk_large_edges) |
| chunk_repeated = 1; |
| else |
| graph->chunk_large_edges = data + chunk_offset; |
| break; |
| } |
| |
| if (chunk_repeated) { |
| error(_("chunk id %08x appears multiple times"), chunk_id); |
| goto cleanup_fail; |
| } |
| |
| if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP) |
| { |
| graph->num_commits = (chunk_offset - last_chunk_offset) |
| / graph->hash_len; |
| } |
| |
| last_chunk_id = chunk_id; |
| last_chunk_offset = chunk_offset; |
| } |
| |
| return graph; |
| |
| cleanup_fail: |
| munmap(graph_map, graph_size); |
| close(fd); |
| exit(1); |
| } |
| |
| static void prepare_commit_graph_one(struct repository *r, const char *obj_dir) |
| { |
| char *graph_name; |
| |
| if (r->objects->commit_graph) |
| return; |
| |
| graph_name = get_commit_graph_filename(obj_dir); |
| r->objects->commit_graph = |
| load_commit_graph_one(graph_name); |
| |
| FREE_AND_NULL(graph_name); |
| } |
| |
| /* |
| * Return 1 if commit_graph is non-NULL, and 0 otherwise. |
| * |
| * On the first invocation, this function attemps to load the commit |
| * graph if the_repository is configured to have one. |
| */ |
| static int prepare_commit_graph(struct repository *r) |
| { |
| struct alternate_object_database *alt; |
| char *obj_dir; |
| int config_value; |
| |
| if (r->objects->commit_graph_attempted) |
| return !!r->objects->commit_graph; |
| r->objects->commit_graph_attempted = 1; |
| |
| if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) && |
| (repo_config_get_bool(r, "core.commitgraph", &config_value) || |
| !config_value)) |
| /* |
| * This repository is not configured to use commit graphs, so |
| * do not load one. (But report commit_graph_attempted anyway |
| * so that commit graph loading is not attempted again for this |
| * repository.) |
| */ |
| return 0; |
| |
| if (!commit_graph_compatible(r)) |
| return 0; |
| |
| obj_dir = r->objects->objectdir; |
| prepare_commit_graph_one(r, obj_dir); |
| prepare_alt_odb(r); |
| for (alt = r->objects->alt_odb_list; |
| !r->objects->commit_graph && alt; |
| alt = alt->next) |
| prepare_commit_graph_one(r, alt->path); |
| return !!r->objects->commit_graph; |
| } |
| |
| int generation_numbers_enabled(struct repository *r) |
| { |
| uint32_t first_generation; |
| struct commit_graph *g; |
| if (!prepare_commit_graph(r)) |
| return 0; |
| |
| g = r->objects->commit_graph; |
| |
| if (!g->num_commits) |
| return 0; |
| |
| first_generation = get_be32(g->chunk_commit_data + |
| g->hash_len + 8) >> 2; |
| |
| return !!first_generation; |
| } |
| |
| void close_commit_graph(struct repository *r) |
| { |
| free_commit_graph(r->objects->commit_graph); |
| r->objects->commit_graph = NULL; |
| } |
| |
| static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos) |
| { |
| return bsearch_hash(oid->hash, g->chunk_oid_fanout, |
| g->chunk_oid_lookup, g->hash_len, pos); |
| } |
| |
| static struct commit_list **insert_parent_or_die(struct commit_graph *g, |
| uint64_t pos, |
| struct commit_list **pptr) |
| { |
| struct commit *c; |
| struct object_id oid; |
| |
| if (pos >= g->num_commits) |
| die("invalid parent position %"PRIu64, pos); |
| |
| hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * pos); |
| c = lookup_commit(the_repository, &oid); |
| if (!c) |
| die(_("could not find commit %s"), oid_to_hex(&oid)); |
| c->graph_pos = pos; |
| return &commit_list_insert(c, pptr)->next; |
| } |
| |
| static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos) |
| { |
| const unsigned char *commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * pos; |
| item->graph_pos = pos; |
| item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; |
| } |
| |
| static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t pos) |
| { |
| uint32_t edge_value; |
| uint32_t *parent_data_ptr; |
| uint64_t date_low, date_high; |
| struct commit_list **pptr; |
| const unsigned char *commit_data = g->chunk_commit_data + (g->hash_len + 16) * pos; |
| |
| item->object.parsed = 1; |
| item->graph_pos = pos; |
| |
| item->maybe_tree = NULL; |
| |
| date_high = get_be32(commit_data + g->hash_len + 8) & 0x3; |
| date_low = get_be32(commit_data + g->hash_len + 12); |
| item->date = (timestamp_t)((date_high << 32) | date_low); |
| |
| item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; |
| |
| pptr = &item->parents; |
| |
| edge_value = get_be32(commit_data + g->hash_len); |
| if (edge_value == GRAPH_PARENT_NONE) |
| return 1; |
| pptr = insert_parent_or_die(g, edge_value, pptr); |
| |
| edge_value = get_be32(commit_data + g->hash_len + 4); |
| if (edge_value == GRAPH_PARENT_NONE) |
| return 1; |
| if (!(edge_value & GRAPH_OCTOPUS_EDGES_NEEDED)) { |
| pptr = insert_parent_or_die(g, edge_value, pptr); |
| return 1; |
| } |
| |
| parent_data_ptr = (uint32_t*)(g->chunk_large_edges + |
| 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK)); |
| do { |
| edge_value = get_be32(parent_data_ptr); |
| pptr = insert_parent_or_die(g, |
| edge_value & GRAPH_EDGE_LAST_MASK, |
| pptr); |
| parent_data_ptr++; |
| } while (!(edge_value & GRAPH_LAST_EDGE)); |
| |
| return 1; |
| } |
| |
| static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos) |
| { |
| if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) { |
| *pos = item->graph_pos; |
| return 1; |
| } else { |
| return bsearch_graph(g, &(item->object.oid), pos); |
| } |
| } |
| |
| static int parse_commit_in_graph_one(struct commit_graph *g, struct commit *item) |
| { |
| uint32_t pos; |
| |
| if (item->object.parsed) |
| return 1; |
| |
| if (find_commit_in_graph(item, g, &pos)) |
| return fill_commit_in_graph(item, g, pos); |
| |
| return 0; |
| } |
| |
| int parse_commit_in_graph(struct repository *r, struct commit *item) |
| { |
| if (!prepare_commit_graph(r)) |
| return 0; |
| return parse_commit_in_graph_one(r->objects->commit_graph, item); |
| } |
| |
| void load_commit_graph_info(struct repository *r, struct commit *item) |
| { |
| uint32_t pos; |
| if (!prepare_commit_graph(r)) |
| return; |
| if (find_commit_in_graph(item, r->objects->commit_graph, &pos)) |
| fill_commit_graph_info(item, r->objects->commit_graph, pos); |
| } |
| |
| static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c) |
| { |
| struct object_id oid; |
| const unsigned char *commit_data = g->chunk_commit_data + |
| GRAPH_DATA_WIDTH * (c->graph_pos); |
| |
| hashcpy(oid.hash, commit_data); |
| c->maybe_tree = lookup_tree(the_repository, &oid); |
| |
| return c->maybe_tree; |
| } |
| |
| static struct tree *get_commit_tree_in_graph_one(struct commit_graph *g, |
| const struct commit *c) |
| { |
| if (c->maybe_tree) |
| return c->maybe_tree; |
| if (c->graph_pos == COMMIT_NOT_FROM_GRAPH) |
| BUG("get_commit_tree_in_graph_one called from non-commit-graph commit"); |
| |
| return load_tree_for_commit(g, (struct commit *)c); |
| } |
| |
| struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c) |
| { |
| return get_commit_tree_in_graph_one(r->objects->commit_graph, c); |
| } |
| |
| static void write_graph_chunk_fanout(struct hashfile *f, |
| struct commit **commits, |
| int nr_commits) |
| { |
| int i, count = 0; |
| struct commit **list = commits; |
| |
| /* |
| * Write the first-level table (the list is sorted, |
| * but we use a 256-entry lookup to be able to avoid |
| * having to do eight extra binary search iterations). |
| */ |
| for (i = 0; i < 256; i++) { |
| while (count < nr_commits) { |
| if ((*list)->object.oid.hash[0] != i) |
| break; |
| count++; |
| list++; |
| } |
| |
| hashwrite_be32(f, count); |
| } |
| } |
| |
| static void write_graph_chunk_oids(struct hashfile *f, int hash_len, |
| struct commit **commits, int nr_commits) |
| { |
| struct commit **list = commits; |
| int count; |
| for (count = 0; count < nr_commits; count++, list++) |
| hashwrite(f, (*list)->object.oid.hash, (int)hash_len); |
| } |
| |
| static const unsigned char *commit_to_sha1(size_t index, void *table) |
| { |
| struct commit **commits = table; |
| return commits[index]->object.oid.hash; |
| } |
| |
| static void write_graph_chunk_data(struct hashfile *f, int hash_len, |
| struct commit **commits, int nr_commits) |
| { |
| struct commit **list = commits; |
| struct commit **last = commits + nr_commits; |
| uint32_t num_extra_edges = 0; |
| |
| while (list < last) { |
| struct commit_list *parent; |
| int edge_value; |
| uint32_t packedDate[2]; |
| |
| parse_commit(*list); |
| hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len); |
| |
| parent = (*list)->parents; |
| |
| if (!parent) |
| edge_value = GRAPH_PARENT_NONE; |
| else { |
| edge_value = sha1_pos(parent->item->object.oid.hash, |
| commits, |
| nr_commits, |
| commit_to_sha1); |
| |
| if (edge_value < 0) |
| edge_value = GRAPH_PARENT_MISSING; |
| } |
| |
| hashwrite_be32(f, edge_value); |
| |
| if (parent) |
| parent = parent->next; |
| |
| if (!parent) |
| edge_value = GRAPH_PARENT_NONE; |
| else if (parent->next) |
| edge_value = GRAPH_OCTOPUS_EDGES_NEEDED | num_extra_edges; |
| else { |
| edge_value = sha1_pos(parent->item->object.oid.hash, |
| commits, |
| nr_commits, |
| commit_to_sha1); |
| if (edge_value < 0) |
| edge_value = GRAPH_PARENT_MISSING; |
| } |
| |
| hashwrite_be32(f, edge_value); |
| |
| if (edge_value & GRAPH_OCTOPUS_EDGES_NEEDED) { |
| do { |
| num_extra_edges++; |
| parent = parent->next; |
| } while (parent); |
| } |
| |
| if (sizeof((*list)->date) > 4) |
| packedDate[0] = htonl(((*list)->date >> 32) & 0x3); |
| else |
| packedDate[0] = 0; |
| |
| packedDate[0] |= htonl((*list)->generation << 2); |
| |
| packedDate[1] = htonl((*list)->date); |
| hashwrite(f, packedDate, 8); |
| |
| list++; |
| } |
| } |
| |
| static void write_graph_chunk_large_edges(struct hashfile *f, |
| struct commit **commits, |
| int nr_commits) |
| { |
| struct commit **list = commits; |
| struct commit **last = commits + nr_commits; |
| struct commit_list *parent; |
| |
| while (list < last) { |
| int num_parents = 0; |
| for (parent = (*list)->parents; num_parents < 3 && parent; |
| parent = parent->next) |
| num_parents++; |
| |
| if (num_parents <= 2) { |
| list++; |
| continue; |
| } |
| |
| /* Since num_parents > 2, this initializer is safe. */ |
| for (parent = (*list)->parents->next; parent; parent = parent->next) { |
| int edge_value = sha1_pos(parent->item->object.oid.hash, |
| commits, |
| nr_commits, |
| commit_to_sha1); |
| |
| if (edge_value < 0) |
| edge_value = GRAPH_PARENT_MISSING; |
| else if (!parent->next) |
| edge_value |= GRAPH_LAST_EDGE; |
| |
| hashwrite_be32(f, edge_value); |
| } |
| |
| list++; |
| } |
| } |
| |
| static int commit_compare(const void *_a, const void *_b) |
| { |
| const struct object_id *a = (const struct object_id *)_a; |
| const struct object_id *b = (const struct object_id *)_b; |
| return oidcmp(a, b); |
| } |
| |
| struct packed_commit_list { |
| struct commit **list; |
| int nr; |
| int alloc; |
| }; |
| |
| struct packed_oid_list { |
| struct object_id *list; |
| int nr; |
| int alloc; |
| struct progress *progress; |
| int progress_done; |
| }; |
| |
| static int add_packed_commits(const struct object_id *oid, |
| struct packed_git *pack, |
| uint32_t pos, |
| void *data) |
| { |
| struct packed_oid_list *list = (struct packed_oid_list*)data; |
| enum object_type type; |
| off_t offset = nth_packed_object_offset(pack, pos); |
| struct object_info oi = OBJECT_INFO_INIT; |
| |
| if (list->progress) |
| display_progress(list->progress, ++list->progress_done); |
| |
| oi.typep = &type; |
| if (packed_object_info(the_repository, pack, offset, &oi) < 0) |
| die(_("unable to get type of object %s"), oid_to_hex(oid)); |
| |
| if (type != OBJ_COMMIT) |
| return 0; |
| |
| ALLOC_GROW(list->list, list->nr + 1, list->alloc); |
| oidcpy(&(list->list[list->nr]), oid); |
| list->nr++; |
| |
| return 0; |
| } |
| |
| static void add_missing_parents(struct packed_oid_list *oids, struct commit *commit) |
| { |
| struct commit_list *parent; |
| for (parent = commit->parents; parent; parent = parent->next) { |
| if (!(parent->item->object.flags & UNINTERESTING)) { |
| ALLOC_GROW(oids->list, oids->nr + 1, oids->alloc); |
| oidcpy(&oids->list[oids->nr], &(parent->item->object.oid)); |
| oids->nr++; |
| parent->item->object.flags |= UNINTERESTING; |
| } |
| } |
| } |
| |
| static void close_reachable(struct packed_oid_list *oids, int report_progress) |
| { |
| int i; |
| struct commit *commit; |
| struct progress *progress = NULL; |
| int j = 0; |
| |
| if (report_progress) |
| progress = start_delayed_progress( |
| _("Annotating commits in commit graph"), 0); |
| for (i = 0; i < oids->nr; i++) { |
| display_progress(progress, ++j); |
| commit = lookup_commit(the_repository, &oids->list[i]); |
| if (commit) |
| commit->object.flags |= UNINTERESTING; |
| } |
| |
| /* |
| * As this loop runs, oids->nr may grow, but not more |
| * than the number of missing commits in the reachable |
| * closure. |
| */ |
| for (i = 0; i < oids->nr; i++) { |
| display_progress(progress, ++j); |
| commit = lookup_commit(the_repository, &oids->list[i]); |
| |
| if (commit && !parse_commit(commit)) |
| add_missing_parents(oids, commit); |
| } |
| |
| for (i = 0; i < oids->nr; i++) { |
| display_progress(progress, ++j); |
| commit = lookup_commit(the_repository, &oids->list[i]); |
| |
| if (commit) |
| commit->object.flags &= ~UNINTERESTING; |
| } |
| stop_progress(&progress); |
| } |
| |
| static void compute_generation_numbers(struct packed_commit_list* commits, |
| int report_progress) |
| { |
| int i; |
| struct commit_list *list = NULL; |
| struct progress *progress = NULL; |
| |
| if (report_progress) |
| progress = start_progress( |
| _("Computing commit graph generation numbers"), |
| commits->nr); |
| for (i = 0; i < commits->nr; i++) { |
| display_progress(progress, i + 1); |
| if (commits->list[i]->generation != GENERATION_NUMBER_INFINITY && |
| commits->list[i]->generation != GENERATION_NUMBER_ZERO) |
| continue; |
| |
| commit_list_insert(commits->list[i], &list); |
| while (list) { |
| struct commit *current = list->item; |
| struct commit_list *parent; |
| int all_parents_computed = 1; |
| uint32_t max_generation = 0; |
| |
| for (parent = current->parents; parent; parent = parent->next) { |
| if (parent->item->generation == GENERATION_NUMBER_INFINITY || |
| parent->item->generation == GENERATION_NUMBER_ZERO) { |
| all_parents_computed = 0; |
| commit_list_insert(parent->item, &list); |
| break; |
| } else if (parent->item->generation > max_generation) { |
| max_generation = parent->item->generation; |
| } |
| } |
| |
| if (all_parents_computed) { |
| current->generation = max_generation + 1; |
| pop_commit(&list); |
| |
| if (current->generation > GENERATION_NUMBER_MAX) |
| current->generation = GENERATION_NUMBER_MAX; |
| } |
| } |
| } |
| stop_progress(&progress); |
| } |
| |
| static int add_ref_to_list(const char *refname, |
| const struct object_id *oid, |
| int flags, void *cb_data) |
| { |
| struct string_list *list = (struct string_list *)cb_data; |
| |
| string_list_append(list, oid_to_hex(oid)); |
| return 0; |
| } |
| |
| void write_commit_graph_reachable(const char *obj_dir, int append, |
| int report_progress) |
| { |
| struct string_list list = STRING_LIST_INIT_DUP; |
| |
| for_each_ref(add_ref_to_list, &list); |
| write_commit_graph(obj_dir, NULL, &list, append, report_progress); |
| |
| string_list_clear(&list, 0); |
| } |
| |
| void write_commit_graph(const char *obj_dir, |
| struct string_list *pack_indexes, |
| struct string_list *commit_hex, |
| int append, int report_progress) |
| { |
| struct packed_oid_list oids; |
| struct packed_commit_list commits; |
| struct hashfile *f; |
| uint32_t i, count_distinct = 0; |
| char *graph_name; |
| struct lock_file lk = LOCK_INIT; |
| uint32_t chunk_ids[5]; |
| uint64_t chunk_offsets[5]; |
| int num_chunks; |
| int num_extra_edges; |
| struct commit_list *parent; |
| struct progress *progress = NULL; |
| |
| if (!commit_graph_compatible(the_repository)) |
| return; |
| |
| oids.nr = 0; |
| oids.alloc = approximate_object_count() / 32; |
| oids.progress = NULL; |
| oids.progress_done = 0; |
| |
| if (append) { |
| prepare_commit_graph_one(the_repository, obj_dir); |
| if (the_repository->objects->commit_graph) |
| oids.alloc += the_repository->objects->commit_graph->num_commits; |
| } |
| |
| if (oids.alloc < 1024) |
| oids.alloc = 1024; |
| ALLOC_ARRAY(oids.list, oids.alloc); |
| |
| if (append && the_repository->objects->commit_graph) { |
| struct commit_graph *commit_graph = |
| the_repository->objects->commit_graph; |
| for (i = 0; i < commit_graph->num_commits; i++) { |
| const unsigned char *hash = commit_graph->chunk_oid_lookup + |
| commit_graph->hash_len * i; |
| hashcpy(oids.list[oids.nr++].hash, hash); |
| } |
| } |
| |
| if (pack_indexes) { |
| struct strbuf packname = STRBUF_INIT; |
| int dirlen; |
| strbuf_addf(&packname, "%s/pack/", obj_dir); |
| dirlen = packname.len; |
| if (report_progress) { |
| oids.progress = start_delayed_progress( |
| _("Finding commits for commit graph"), 0); |
| oids.progress_done = 0; |
| } |
| for (i = 0; i < pack_indexes->nr; i++) { |
| struct packed_git *p; |
| strbuf_setlen(&packname, dirlen); |
| strbuf_addstr(&packname, pack_indexes->items[i].string); |
| p = add_packed_git(packname.buf, packname.len, 1); |
| if (!p) |
| die(_("error adding pack %s"), packname.buf); |
| if (open_pack_index(p)) |
| die(_("error opening index for %s"), packname.buf); |
| for_each_object_in_pack(p, add_packed_commits, &oids, 0); |
| close_pack(p); |
| free(p); |
| } |
| stop_progress(&oids.progress); |
| strbuf_release(&packname); |
| } |
| |
| if (commit_hex) { |
| if (report_progress) |
| progress = start_delayed_progress( |
| _("Finding commits for commit graph"), |
| commit_hex->nr); |
| for (i = 0; i < commit_hex->nr; i++) { |
| const char *end; |
| struct object_id oid; |
| struct commit *result; |
| |
| display_progress(progress, i + 1); |
| if (commit_hex->items[i].string && |
| parse_oid_hex(commit_hex->items[i].string, &oid, &end)) |
| continue; |
| |
| result = lookup_commit_reference_gently(the_repository, &oid, 1); |
| |
| if (result) { |
| ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc); |
| oidcpy(&oids.list[oids.nr], &(result->object.oid)); |
| oids.nr++; |
| } |
| } |
| stop_progress(&progress); |
| } |
| |
| if (!pack_indexes && !commit_hex) { |
| if (report_progress) |
| oids.progress = start_delayed_progress( |
| _("Finding commits for commit graph"), 0); |
| for_each_packed_object(add_packed_commits, &oids, 0); |
| stop_progress(&oids.progress); |
| } |
| |
| close_reachable(&oids, report_progress); |
| |
| QSORT(oids.list, oids.nr, commit_compare); |
| |
| count_distinct = 1; |
| for (i = 1; i < oids.nr; i++) { |
| if (!oideq(&oids.list[i - 1], &oids.list[i])) |
| count_distinct++; |
| } |
| |
| if (count_distinct >= GRAPH_PARENT_MISSING) |
| die(_("the commit graph format cannot write %d commits"), count_distinct); |
| |
| commits.nr = 0; |
| commits.alloc = count_distinct; |
| ALLOC_ARRAY(commits.list, commits.alloc); |
| |
| num_extra_edges = 0; |
| for (i = 0; i < oids.nr; i++) { |
| int num_parents = 0; |
| if (i > 0 && oideq(&oids.list[i - 1], &oids.list[i])) |
| continue; |
| |
| commits.list[commits.nr] = lookup_commit(the_repository, &oids.list[i]); |
| parse_commit(commits.list[commits.nr]); |
| |
| for (parent = commits.list[commits.nr]->parents; |
| parent; parent = parent->next) |
| num_parents++; |
| |
| if (num_parents > 2) |
| num_extra_edges += num_parents - 1; |
| |
| commits.nr++; |
| } |
| num_chunks = num_extra_edges ? 4 : 3; |
| |
| if (commits.nr >= GRAPH_PARENT_MISSING) |
| die(_("too many commits to write graph")); |
| |
| compute_generation_numbers(&commits, report_progress); |
| |
| graph_name = get_commit_graph_filename(obj_dir); |
| if (safe_create_leading_directories(graph_name)) { |
| UNLEAK(graph_name); |
| die_errno(_("unable to create leading directories of %s"), |
| graph_name); |
| } |
| |
| hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR); |
| f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); |
| |
| hashwrite_be32(f, GRAPH_SIGNATURE); |
| |
| hashwrite_u8(f, GRAPH_VERSION); |
| hashwrite_u8(f, GRAPH_OID_VERSION); |
| hashwrite_u8(f, num_chunks); |
| hashwrite_u8(f, 0); /* unused padding byte */ |
| |
| chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT; |
| chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP; |
| chunk_ids[2] = GRAPH_CHUNKID_DATA; |
| if (num_extra_edges) |
| chunk_ids[3] = GRAPH_CHUNKID_LARGEEDGES; |
| else |
| chunk_ids[3] = 0; |
| chunk_ids[4] = 0; |
| |
| chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH; |
| chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE; |
| chunk_offsets[2] = chunk_offsets[1] + GRAPH_OID_LEN * commits.nr; |
| chunk_offsets[3] = chunk_offsets[2] + (GRAPH_OID_LEN + 16) * commits.nr; |
| chunk_offsets[4] = chunk_offsets[3] + 4 * num_extra_edges; |
| |
| for (i = 0; i <= num_chunks; i++) { |
| uint32_t chunk_write[3]; |
| |
| chunk_write[0] = htonl(chunk_ids[i]); |
| chunk_write[1] = htonl(chunk_offsets[i] >> 32); |
| chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff); |
| hashwrite(f, chunk_write, 12); |
| } |
| |
| write_graph_chunk_fanout(f, commits.list, commits.nr); |
| write_graph_chunk_oids(f, GRAPH_OID_LEN, commits.list, commits.nr); |
| write_graph_chunk_data(f, GRAPH_OID_LEN, commits.list, commits.nr); |
| write_graph_chunk_large_edges(f, commits.list, commits.nr); |
| |
| close_commit_graph(the_repository); |
| finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC); |
| commit_lock_file(&lk); |
| |
| free(graph_name); |
| free(commits.list); |
| free(oids.list); |
| } |
| |
| #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2 |
| static int verify_commit_graph_error; |
| |
| static void graph_report(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| verify_commit_graph_error = 1; |
| va_start(ap, fmt); |
| vfprintf(stderr, fmt, ap); |
| fprintf(stderr, "\n"); |
| va_end(ap); |
| } |
| |
| #define GENERATION_ZERO_EXISTS 1 |
| #define GENERATION_NUMBER_EXISTS 2 |
| |
| int verify_commit_graph(struct repository *r, struct commit_graph *g) |
| { |
| uint32_t i, cur_fanout_pos = 0; |
| struct object_id prev_oid, cur_oid, checksum; |
| int generation_zero = 0; |
| struct hashfile *f; |
| int devnull; |
| struct progress *progress = NULL; |
| |
| if (!g) { |
| graph_report("no commit-graph file loaded"); |
| return 1; |
| } |
| |
| verify_commit_graph_error = 0; |
| |
| if (!g->chunk_oid_fanout) |
| graph_report("commit-graph is missing the OID Fanout chunk"); |
| if (!g->chunk_oid_lookup) |
| graph_report("commit-graph is missing the OID Lookup chunk"); |
| if (!g->chunk_commit_data) |
| graph_report("commit-graph is missing the Commit Data chunk"); |
| |
| if (verify_commit_graph_error) |
| return verify_commit_graph_error; |
| |
| devnull = open("/dev/null", O_WRONLY); |
| f = hashfd(devnull, NULL); |
| hashwrite(f, g->data, g->data_len - g->hash_len); |
| finalize_hashfile(f, checksum.hash, CSUM_CLOSE); |
| if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) { |
| graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt")); |
| verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH; |
| } |
| |
| for (i = 0; i < g->num_commits; i++) { |
| struct commit *graph_commit; |
| |
| hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i); |
| |
| if (i && oidcmp(&prev_oid, &cur_oid) >= 0) |
| graph_report("commit-graph has incorrect OID order: %s then %s", |
| oid_to_hex(&prev_oid), |
| oid_to_hex(&cur_oid)); |
| |
| oidcpy(&prev_oid, &cur_oid); |
| |
| while (cur_oid.hash[0] > cur_fanout_pos) { |
| uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos); |
| |
| if (i != fanout_value) |
| graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u", |
| cur_fanout_pos, fanout_value, i); |
| cur_fanout_pos++; |
| } |
| |
| graph_commit = lookup_commit(r, &cur_oid); |
| if (!parse_commit_in_graph_one(g, graph_commit)) |
| graph_report("failed to parse %s from commit-graph", |
| oid_to_hex(&cur_oid)); |
| } |
| |
| while (cur_fanout_pos < 256) { |
| uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos); |
| |
| if (g->num_commits != fanout_value) |
| graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u", |
| cur_fanout_pos, fanout_value, i); |
| |
| cur_fanout_pos++; |
| } |
| |
| if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH) |
| return verify_commit_graph_error; |
| |
| progress = start_progress(_("Verifying commits in commit graph"), |
| g->num_commits); |
| for (i = 0; i < g->num_commits; i++) { |
| struct commit *graph_commit, *odb_commit; |
| struct commit_list *graph_parents, *odb_parents; |
| uint32_t max_generation = 0; |
| |
| display_progress(progress, i + 1); |
| hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i); |
| |
| graph_commit = lookup_commit(r, &cur_oid); |
| odb_commit = (struct commit *)create_object(r, cur_oid.hash, alloc_commit_node(r)); |
| if (parse_commit_internal(odb_commit, 0, 0)) { |
| graph_report("failed to parse %s from object database", |
| oid_to_hex(&cur_oid)); |
| continue; |
| } |
| |
| if (!oideq(&get_commit_tree_in_graph_one(g, graph_commit)->object.oid, |
| get_commit_tree_oid(odb_commit))) |
| graph_report("root tree OID for commit %s in commit-graph is %s != %s", |
| oid_to_hex(&cur_oid), |
| oid_to_hex(get_commit_tree_oid(graph_commit)), |
| oid_to_hex(get_commit_tree_oid(odb_commit))); |
| |
| graph_parents = graph_commit->parents; |
| odb_parents = odb_commit->parents; |
| |
| while (graph_parents) { |
| if (odb_parents == NULL) { |
| graph_report("commit-graph parent list for commit %s is too long", |
| oid_to_hex(&cur_oid)); |
| break; |
| } |
| |
| if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid)) |
| graph_report("commit-graph parent for %s is %s != %s", |
| oid_to_hex(&cur_oid), |
| oid_to_hex(&graph_parents->item->object.oid), |
| oid_to_hex(&odb_parents->item->object.oid)); |
| |
| if (graph_parents->item->generation > max_generation) |
| max_generation = graph_parents->item->generation; |
| |
| graph_parents = graph_parents->next; |
| odb_parents = odb_parents->next; |
| } |
| |
| if (odb_parents != NULL) |
| graph_report("commit-graph parent list for commit %s terminates early", |
| oid_to_hex(&cur_oid)); |
| |
| if (!graph_commit->generation) { |
| if (generation_zero == GENERATION_NUMBER_EXISTS) |
| graph_report("commit-graph has generation number zero for commit %s, but non-zero elsewhere", |
| oid_to_hex(&cur_oid)); |
| generation_zero = GENERATION_ZERO_EXISTS; |
| } else if (generation_zero == GENERATION_ZERO_EXISTS) |
| graph_report("commit-graph has non-zero generation number for commit %s, but zero elsewhere", |
| oid_to_hex(&cur_oid)); |
| |
| if (generation_zero == GENERATION_ZERO_EXISTS) |
| continue; |
| |
| /* |
| * If one of our parents has generation GENERATION_NUMBER_MAX, then |
| * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid |
| * extra logic in the following condition. |
| */ |
| if (max_generation == GENERATION_NUMBER_MAX) |
| max_generation--; |
| |
| if (graph_commit->generation != max_generation + 1) |
| graph_report("commit-graph generation for commit %s is %u != %u", |
| oid_to_hex(&cur_oid), |
| graph_commit->generation, |
| max_generation + 1); |
| |
| if (graph_commit->date != odb_commit->date) |
| graph_report("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime, |
| oid_to_hex(&cur_oid), |
| graph_commit->date, |
| odb_commit->date); |
| } |
| stop_progress(&progress); |
| |
| return verify_commit_graph_error; |
| } |
| |
| void free_commit_graph(struct commit_graph *g) |
| { |
| if (!g) |
| return; |
| if (g->graph_fd >= 0) { |
| munmap((void *)g->data, g->data_len); |
| g->data = NULL; |
| close(g->graph_fd); |
| } |
| free(g); |
| } |