| #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_EXTRAEDGES 0x45444745 /* "EDGE" */ |
| #define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */ |
| |
| #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16) |
| |
| #define GRAPH_VERSION_1 0x1 |
| #define GRAPH_VERSION GRAPH_VERSION_1 |
| |
| #define GRAPH_EXTRA_EDGES_NEEDED 0x80000000 |
| #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 + the_hash_algo->rawsz) |
| |
| /* Remember to update object flag allocation in object.h */ |
| #define REACHABLE (1u<<15) |
| |
| char *get_commit_graph_filename(struct object_directory *odb) |
| { |
| return xstrfmt("%s/info/commit-graph", odb->path); |
| } |
| |
| static char *get_split_graph_filename(struct object_directory *odb, |
| const char *oid_hex) |
| { |
| return xstrfmt("%s/info/commit-graphs/graph-%s.graph", odb->path, |
| oid_hex); |
| } |
| |
| static char *get_chain_filename(struct object_directory *odb) |
| { |
| return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path); |
| } |
| |
| static uint8_t oid_version(void) |
| { |
| return 1; |
| } |
| |
| 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; |
| } |
| |
| int open_commit_graph(const char *graph_file, int *fd, struct stat *st) |
| { |
| *fd = git_open(graph_file); |
| if (*fd < 0) |
| return 0; |
| if (fstat(*fd, st)) { |
| close(*fd); |
| return 0; |
| } |
| return 1; |
| } |
| |
| struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st, |
| struct object_directory *odb) |
| { |
| void *graph_map; |
| size_t graph_size; |
| struct commit_graph *ret; |
| |
| graph_size = xsize_t(st->st_size); |
| |
| if (graph_size < GRAPH_MIN_SIZE) { |
| close(fd); |
| error(_("commit-graph file is too small")); |
| return NULL; |
| } |
| graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| ret = parse_commit_graph(graph_map, fd, graph_size); |
| |
| if (ret) |
| ret->odb = odb; |
| else { |
| munmap(graph_map, graph_size); |
| close(fd); |
| } |
| |
| return ret; |
| } |
| |
| static int verify_commit_graph_lite(struct commit_graph *g) |
| { |
| /* |
| * Basic validation shared between parse_commit_graph() |
| * which'll be called every time the graph is used, and the |
| * much more expensive verify_commit_graph() used by |
| * "commit-graph verify". |
| * |
| * There should only be very basic checks here to ensure that |
| * we don't e.g. segfault in fill_commit_in_graph(), but |
| * because this is a very hot codepath nothing that e.g. loops |
| * over g->num_commits, or runs a checksum on the commit-graph |
| * itself. |
| */ |
| if (!g->chunk_oid_fanout) { |
| error("commit-graph is missing the OID Fanout chunk"); |
| return 1; |
| } |
| if (!g->chunk_oid_lookup) { |
| error("commit-graph is missing the OID Lookup chunk"); |
| return 1; |
| } |
| if (!g->chunk_commit_data) { |
| error("commit-graph is missing the Commit Data chunk"); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| struct commit_graph *parse_commit_graph(void *graph_map, int fd, |
| size_t graph_size) |
| { |
| const unsigned char *data, *chunk_lookup; |
| uint32_t i; |
| struct commit_graph *graph; |
| uint64_t last_chunk_offset; |
| uint32_t last_chunk_id; |
| uint32_t graph_signature; |
| unsigned char graph_version, hash_version; |
| |
| if (!graph_map) |
| return NULL; |
| |
| if (graph_size < GRAPH_MIN_SIZE) |
| return NULL; |
| |
| data = (const unsigned char *)graph_map; |
| |
| graph_signature = get_be32(data); |
| if (graph_signature != GRAPH_SIGNATURE) { |
| error(_("commit-graph signature %X does not match signature %X"), |
| graph_signature, GRAPH_SIGNATURE); |
| return NULL; |
| } |
| |
| graph_version = *(unsigned char*)(data + 4); |
| if (graph_version != GRAPH_VERSION) { |
| error(_("commit-graph version %X does not match version %X"), |
| graph_version, GRAPH_VERSION); |
| return NULL; |
| } |
| |
| hash_version = *(unsigned char*)(data + 5); |
| if (hash_version != oid_version()) { |
| error(_("commit-graph hash version %X does not match version %X"), |
| hash_version, oid_version()); |
| return NULL; |
| } |
| |
| graph = alloc_commit_graph(); |
| |
| graph->hash_len = the_hash_algo->rawsz; |
| 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; |
| uint64_t chunk_offset; |
| int chunk_repeated = 0; |
| |
| if (data + graph_size - chunk_lookup < |
| GRAPH_CHUNKLOOKUP_WIDTH) { |
| error(_("commit-graph chunk lookup table entry missing; file may be incomplete")); |
| free(graph); |
| return NULL; |
| } |
| |
| chunk_id = get_be32(chunk_lookup + 0); |
| chunk_offset = get_be64(chunk_lookup + 4); |
| |
| chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; |
| |
| if (chunk_offset > graph_size - the_hash_algo->rawsz) { |
| error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32), |
| (uint32_t)chunk_offset); |
| free(graph); |
| return NULL; |
| } |
| |
| 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_EXTRAEDGES: |
| if (graph->chunk_extra_edges) |
| chunk_repeated = 1; |
| else |
| graph->chunk_extra_edges = data + chunk_offset; |
| break; |
| |
| case GRAPH_CHUNKID_BASE: |
| if (graph->chunk_base_graphs) |
| chunk_repeated = 1; |
| else |
| graph->chunk_base_graphs = data + chunk_offset; |
| } |
| |
| if (chunk_repeated) { |
| error(_("commit-graph chunk id %08x appears multiple times"), chunk_id); |
| free(graph); |
| return NULL; |
| } |
| |
| 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; |
| } |
| |
| hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len); |
| |
| if (verify_commit_graph_lite(graph)) { |
| free(graph); |
| return NULL; |
| } |
| |
| return graph; |
| } |
| |
| static struct commit_graph *load_commit_graph_one(const char *graph_file, |
| struct object_directory *odb) |
| { |
| |
| struct stat st; |
| int fd; |
| struct commit_graph *g; |
| int open_ok = open_commit_graph(graph_file, &fd, &st); |
| |
| if (!open_ok) |
| return NULL; |
| |
| g = load_commit_graph_one_fd_st(fd, &st, odb); |
| |
| if (g) |
| g->filename = xstrdup(graph_file); |
| |
| return g; |
| } |
| |
| static struct commit_graph *load_commit_graph_v1(struct repository *r, |
| struct object_directory *odb) |
| { |
| char *graph_name = get_commit_graph_filename(odb); |
| struct commit_graph *g = load_commit_graph_one(graph_name, odb); |
| free(graph_name); |
| |
| return g; |
| } |
| |
| static int add_graph_to_chain(struct commit_graph *g, |
| struct commit_graph *chain, |
| struct object_id *oids, |
| int n) |
| { |
| struct commit_graph *cur_g = chain; |
| |
| if (n && !g->chunk_base_graphs) { |
| warning(_("commit-graph has no base graphs chunk")); |
| return 0; |
| } |
| |
| while (n) { |
| n--; |
| |
| if (!cur_g || |
| !oideq(&oids[n], &cur_g->oid) || |
| !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) { |
| warning(_("commit-graph chain does not match")); |
| return 0; |
| } |
| |
| cur_g = cur_g->base_graph; |
| } |
| |
| g->base_graph = chain; |
| |
| if (chain) |
| g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base; |
| |
| return 1; |
| } |
| |
| static struct commit_graph *load_commit_graph_chain(struct repository *r, |
| struct object_directory *odb) |
| { |
| struct commit_graph *graph_chain = NULL; |
| struct strbuf line = STRBUF_INIT; |
| struct stat st; |
| struct object_id *oids; |
| int i = 0, valid = 1, count; |
| char *chain_name = get_chain_filename(odb); |
| FILE *fp; |
| int stat_res; |
| |
| fp = fopen(chain_name, "r"); |
| stat_res = stat(chain_name, &st); |
| free(chain_name); |
| |
| if (!fp || |
| stat_res || |
| st.st_size <= the_hash_algo->hexsz) |
| return NULL; |
| |
| count = st.st_size / (the_hash_algo->hexsz + 1); |
| oids = xcalloc(count, sizeof(struct object_id)); |
| |
| prepare_alt_odb(r); |
| |
| for (i = 0; i < count; i++) { |
| struct object_directory *odb; |
| |
| if (strbuf_getline_lf(&line, fp) == EOF) |
| break; |
| |
| if (get_oid_hex(line.buf, &oids[i])) { |
| warning(_("invalid commit-graph chain: line '%s' not a hash"), |
| line.buf); |
| valid = 0; |
| break; |
| } |
| |
| valid = 0; |
| for (odb = r->objects->odb; odb; odb = odb->next) { |
| char *graph_name = get_split_graph_filename(odb, line.buf); |
| struct commit_graph *g = load_commit_graph_one(graph_name, odb); |
| |
| free(graph_name); |
| |
| if (g) { |
| if (add_graph_to_chain(g, graph_chain, oids, i)) { |
| graph_chain = g; |
| valid = 1; |
| } |
| |
| break; |
| } |
| } |
| |
| if (!valid) { |
| warning(_("unable to find all commit-graph files")); |
| break; |
| } |
| } |
| |
| free(oids); |
| fclose(fp); |
| strbuf_release(&line); |
| |
| return graph_chain; |
| } |
| |
| struct commit_graph *read_commit_graph_one(struct repository *r, |
| struct object_directory *odb) |
| { |
| struct commit_graph *g = load_commit_graph_v1(r, odb); |
| |
| if (!g) |
| g = load_commit_graph_chain(r, odb); |
| |
| return g; |
| } |
| |
| static void prepare_commit_graph_one(struct repository *r, |
| struct object_directory *odb) |
| { |
| |
| if (r->objects->commit_graph) |
| return; |
| |
| r->objects->commit_graph = read_commit_graph_one(r, odb); |
| } |
| |
| /* |
| * Return 1 if commit_graph is non-NULL, and 0 otherwise. |
| * |
| * On the first invocation, this function attempts to load the commit |
| * graph if the_repository is configured to have one. |
| */ |
| static int prepare_commit_graph(struct repository *r) |
| { |
| struct object_directory *odb; |
| |
| /* |
| * This must come before the "already attempted?" check below, because |
| * we want to disable even an already-loaded graph file. |
| */ |
| if (r->commit_graph_disabled) |
| return 0; |
| |
| 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_DIE_ON_LOAD, 0)) |
| die("dying as requested by the '%s' variable on commit-graph load!", |
| GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD); |
| |
| prepare_repo_settings(r); |
| |
| if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) && |
| r->settings.core_commit_graph != 1) |
| /* |
| * 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; |
| |
| prepare_alt_odb(r); |
| for (odb = r->objects->odb; |
| !r->objects->commit_graph && odb; |
| odb = odb->next) |
| prepare_commit_graph_one(r, odb); |
| 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; |
| } |
| |
| static void close_commit_graph_one(struct commit_graph *g) |
| { |
| if (!g) |
| return; |
| |
| close_commit_graph_one(g->base_graph); |
| free_commit_graph(g); |
| } |
| |
| void close_commit_graph(struct raw_object_store *o) |
| { |
| close_commit_graph_one(o->commit_graph); |
| o->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 void load_oid_from_graph(struct commit_graph *g, |
| uint32_t pos, |
| struct object_id *oid) |
| { |
| uint32_t lex_index; |
| |
| while (g && pos < g->num_commits_in_base) |
| g = g->base_graph; |
| |
| if (!g) |
| BUG("NULL commit-graph"); |
| |
| if (pos >= g->num_commits + g->num_commits_in_base) |
| die(_("invalid commit position. commit-graph is likely corrupt")); |
| |
| lex_index = pos - g->num_commits_in_base; |
| |
| hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index); |
| } |
| |
| static struct commit_list **insert_parent_or_die(struct repository *r, |
| struct commit_graph *g, |
| uint32_t pos, |
| struct commit_list **pptr) |
| { |
| struct commit *c; |
| struct object_id oid; |
| |
| if (pos >= g->num_commits + g->num_commits_in_base) |
| die("invalid parent position %"PRIu32, pos); |
| |
| load_oid_from_graph(g, pos, &oid); |
| c = lookup_commit(r, &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; |
| uint32_t lex_index; |
| |
| while (pos < g->num_commits_in_base) |
| g = g->base_graph; |
| |
| lex_index = pos - g->num_commits_in_base; |
| commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index; |
| item->graph_pos = pos; |
| item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; |
| } |
| |
| static inline void set_commit_tree(struct commit *c, struct tree *t) |
| { |
| c->maybe_tree = t; |
| } |
| |
| static int fill_commit_in_graph(struct repository *r, |
| 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; |
| uint32_t lex_index; |
| |
| while (pos < g->num_commits_in_base) |
| g = g->base_graph; |
| |
| if (pos >= g->num_commits + g->num_commits_in_base) |
| die(_("invalid commit position. commit-graph is likely corrupt")); |
| |
| /* |
| * Store the "full" position, but then use the |
| * "local" position for the rest of the calculation. |
| */ |
| item->graph_pos = pos; |
| lex_index = pos - g->num_commits_in_base; |
| |
| commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index; |
| |
| item->object.parsed = 1; |
| |
| set_commit_tree(item, 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(r, 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_EXTRA_EDGES_NEEDED)) { |
| pptr = insert_parent_or_die(r, g, edge_value, pptr); |
| return 1; |
| } |
| |
| parent_data_ptr = (uint32_t*)(g->chunk_extra_edges + |
| 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK)); |
| do { |
| edge_value = get_be32(parent_data_ptr); |
| pptr = insert_parent_or_die(r, 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 { |
| struct commit_graph *cur_g = g; |
| uint32_t lex_index; |
| |
| while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index)) |
| cur_g = cur_g->base_graph; |
| |
| if (cur_g) { |
| *pos = lex_index + cur_g->num_commits_in_base; |
| return 1; |
| } |
| |
| return 0; |
| } |
| } |
| |
| static int parse_commit_in_graph_one(struct repository *r, |
| 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(r, 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, 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 repository *r, |
| struct commit_graph *g, |
| struct commit *c) |
| { |
| struct object_id oid; |
| const unsigned char *commit_data; |
| |
| while (c->graph_pos < g->num_commits_in_base) |
| g = g->base_graph; |
| |
| commit_data = g->chunk_commit_data + |
| GRAPH_DATA_WIDTH * (c->graph_pos - g->num_commits_in_base); |
| |
| hashcpy(oid.hash, commit_data); |
| set_commit_tree(c, lookup_tree(r, &oid)); |
| |
| return c->maybe_tree; |
| } |
| |
| static struct tree *get_commit_tree_in_graph_one(struct repository *r, |
| 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(r, 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, r->objects->commit_graph, c); |
| } |
| |
| struct packed_commit_list { |
| struct commit **list; |
| int nr; |
| int alloc; |
| }; |
| |
| struct packed_oid_list { |
| struct object_id *list; |
| int nr; |
| int alloc; |
| }; |
| |
| struct write_commit_graph_context { |
| struct repository *r; |
| struct object_directory *odb; |
| char *graph_name; |
| struct packed_oid_list oids; |
| struct packed_commit_list commits; |
| int num_extra_edges; |
| unsigned long approx_nr_objects; |
| struct progress *progress; |
| int progress_done; |
| uint64_t progress_cnt; |
| |
| char *base_graph_name; |
| int num_commit_graphs_before; |
| int num_commit_graphs_after; |
| char **commit_graph_filenames_before; |
| char **commit_graph_filenames_after; |
| char **commit_graph_hash_after; |
| uint32_t new_num_commits_in_base; |
| struct commit_graph *new_base_graph; |
| |
| unsigned append:1, |
| report_progress:1, |
| split:1, |
| check_oids:1; |
| |
| const struct split_commit_graph_opts *split_opts; |
| }; |
| |
| static void write_graph_chunk_fanout(struct hashfile *f, |
| struct write_commit_graph_context *ctx) |
| { |
| int i, count = 0; |
| struct commit **list = ctx->commits.list; |
| |
| /* |
| * 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 < ctx->commits.nr) { |
| if ((*list)->object.oid.hash[0] != i) |
| break; |
| display_progress(ctx->progress, ++ctx->progress_cnt); |
| count++; |
| list++; |
| } |
| |
| hashwrite_be32(f, count); |
| } |
| } |
| |
| static void write_graph_chunk_oids(struct hashfile *f, int hash_len, |
| struct write_commit_graph_context *ctx) |
| { |
| struct commit **list = ctx->commits.list; |
| int count; |
| for (count = 0; count < ctx->commits.nr; count++, list++) { |
| display_progress(ctx->progress, ++ctx->progress_cnt); |
| 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 write_commit_graph_context *ctx) |
| { |
| struct commit **list = ctx->commits.list; |
| struct commit **last = ctx->commits.list + ctx->commits.nr; |
| uint32_t num_extra_edges = 0; |
| |
| while (list < last) { |
| struct commit_list *parent; |
| struct object_id *tree; |
| int edge_value; |
| uint32_t packedDate[2]; |
| display_progress(ctx->progress, ++ctx->progress_cnt); |
| |
| if (parse_commit_no_graph(*list)) |
| die(_("unable to parse commit %s"), |
| oid_to_hex(&(*list)->object.oid)); |
| tree = get_commit_tree_oid(*list); |
| hashwrite(f, tree->hash, hash_len); |
| |
| parent = (*list)->parents; |
| |
| if (!parent) |
| edge_value = GRAPH_PARENT_NONE; |
| else { |
| edge_value = sha1_pos(parent->item->object.oid.hash, |
| ctx->commits.list, |
| ctx->commits.nr, |
| commit_to_sha1); |
| |
| if (edge_value >= 0) |
| edge_value += ctx->new_num_commits_in_base; |
| else { |
| uint32_t pos; |
| if (find_commit_in_graph(parent->item, |
| ctx->new_base_graph, |
| &pos)) |
| edge_value = pos; |
| } |
| |
| if (edge_value < 0) |
| BUG("missing parent %s for commit %s", |
| oid_to_hex(&parent->item->object.oid), |
| oid_to_hex(&(*list)->object.oid)); |
| } |
| |
| hashwrite_be32(f, edge_value); |
| |
| if (parent) |
| parent = parent->next; |
| |
| if (!parent) |
| edge_value = GRAPH_PARENT_NONE; |
| else if (parent->next) |
| edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges; |
| else { |
| edge_value = sha1_pos(parent->item->object.oid.hash, |
| ctx->commits.list, |
| ctx->commits.nr, |
| commit_to_sha1); |
| |
| if (edge_value >= 0) |
| edge_value += ctx->new_num_commits_in_base; |
| else { |
| uint32_t pos; |
| if (find_commit_in_graph(parent->item, |
| ctx->new_base_graph, |
| &pos)) |
| edge_value = pos; |
| } |
| |
| if (edge_value < 0) |
| BUG("missing parent %s for commit %s", |
| oid_to_hex(&parent->item->object.oid), |
| oid_to_hex(&(*list)->object.oid)); |
| } |
| |
| hashwrite_be32(f, edge_value); |
| |
| if (edge_value & GRAPH_EXTRA_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_extra_edges(struct hashfile *f, |
| struct write_commit_graph_context *ctx) |
| { |
| struct commit **list = ctx->commits.list; |
| struct commit **last = ctx->commits.list + ctx->commits.nr; |
| struct commit_list *parent; |
| |
| while (list < last) { |
| int num_parents = 0; |
| |
| display_progress(ctx->progress, ++ctx->progress_cnt); |
| |
| 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, |
| ctx->commits.list, |
| ctx->commits.nr, |
| commit_to_sha1); |
| |
| if (edge_value >= 0) |
| edge_value += ctx->new_num_commits_in_base; |
| else { |
| uint32_t pos; |
| if (find_commit_in_graph(parent->item, |
| ctx->new_base_graph, |
| &pos)) |
| edge_value = pos; |
| } |
| |
| if (edge_value < 0) |
| BUG("missing parent %s for commit %s", |
| oid_to_hex(&parent->item->object.oid), |
| oid_to_hex(&(*list)->object.oid)); |
| else if (!parent->next) |
| edge_value |= GRAPH_LAST_EDGE; |
| |
| hashwrite_be32(f, edge_value); |
| } |
| |
| list++; |
| } |
| } |
| |
| static int oid_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); |
| } |
| |
| static int add_packed_commits(const struct object_id *oid, |
| struct packed_git *pack, |
| uint32_t pos, |
| void *data) |
| { |
| struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data; |
| enum object_type type; |
| off_t offset = nth_packed_object_offset(pack, pos); |
| struct object_info oi = OBJECT_INFO_INIT; |
| |
| if (ctx->progress) |
| display_progress(ctx->progress, ++ctx->progress_done); |
| |
| oi.typep = &type; |
| if (packed_object_info(ctx->r, pack, offset, &oi) < 0) |
| die(_("unable to get type of object %s"), oid_to_hex(oid)); |
| |
| if (type != OBJ_COMMIT) |
| return 0; |
| |
| ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); |
| oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid); |
| ctx->oids.nr++; |
| |
| return 0; |
| } |
| |
| static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit) |
| { |
| struct commit_list *parent; |
| for (parent = commit->parents; parent; parent = parent->next) { |
| if (!(parent->item->object.flags & REACHABLE)) { |
| ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); |
| oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid)); |
| ctx->oids.nr++; |
| parent->item->object.flags |= REACHABLE; |
| } |
| } |
| } |
| |
| static void close_reachable(struct write_commit_graph_context *ctx) |
| { |
| int i; |
| struct commit *commit; |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Loading known commits in commit graph"), |
| ctx->oids.nr); |
| for (i = 0; i < ctx->oids.nr; i++) { |
| display_progress(ctx->progress, i + 1); |
| commit = lookup_commit(ctx->r, &ctx->oids.list[i]); |
| if (commit) |
| commit->object.flags |= REACHABLE; |
| } |
| stop_progress(&ctx->progress); |
| |
| /* |
| * As this loop runs, ctx->oids.nr may grow, but not more |
| * than the number of missing commits in the reachable |
| * closure. |
| */ |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Expanding reachable commits in commit graph"), |
| 0); |
| for (i = 0; i < ctx->oids.nr; i++) { |
| display_progress(ctx->progress, i + 1); |
| commit = lookup_commit(ctx->r, &ctx->oids.list[i]); |
| |
| if (!commit) |
| continue; |
| if (ctx->split) { |
| if (!parse_commit(commit) && |
| commit->graph_pos == COMMIT_NOT_FROM_GRAPH) |
| add_missing_parents(ctx, commit); |
| } else if (!parse_commit_no_graph(commit)) |
| add_missing_parents(ctx, commit); |
| } |
| stop_progress(&ctx->progress); |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Clearing commit marks in commit graph"), |
| ctx->oids.nr); |
| for (i = 0; i < ctx->oids.nr; i++) { |
| display_progress(ctx->progress, i + 1); |
| commit = lookup_commit(ctx->r, &ctx->oids.list[i]); |
| |
| if (commit) |
| commit->object.flags &= ~REACHABLE; |
| } |
| stop_progress(&ctx->progress); |
| } |
| |
| static void compute_generation_numbers(struct write_commit_graph_context *ctx) |
| { |
| int i; |
| struct commit_list *list = NULL; |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Computing commit graph generation numbers"), |
| ctx->commits.nr); |
| for (i = 0; i < ctx->commits.nr; i++) { |
| display_progress(ctx->progress, i + 1); |
| if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY && |
| ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO) |
| continue; |
| |
| commit_list_insert(ctx->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(&ctx->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; |
| } |
| |
| int write_commit_graph_reachable(struct object_directory *odb, |
| enum commit_graph_write_flags flags, |
| const struct split_commit_graph_opts *split_opts) |
| { |
| struct string_list list = STRING_LIST_INIT_DUP; |
| int result; |
| |
| for_each_ref(add_ref_to_list, &list); |
| result = write_commit_graph(odb, NULL, &list, |
| flags, split_opts); |
| |
| string_list_clear(&list, 0); |
| return result; |
| } |
| |
| static int fill_oids_from_packs(struct write_commit_graph_context *ctx, |
| struct string_list *pack_indexes) |
| { |
| uint32_t i; |
| struct strbuf progress_title = STRBUF_INIT; |
| struct strbuf packname = STRBUF_INIT; |
| int dirlen; |
| |
| strbuf_addf(&packname, "%s/pack/", ctx->odb->path); |
| dirlen = packname.len; |
| if (ctx->report_progress) { |
| strbuf_addf(&progress_title, |
| Q_("Finding commits for commit graph in %d pack", |
| "Finding commits for commit graph in %d packs", |
| pack_indexes->nr), |
| pack_indexes->nr); |
| ctx->progress = start_delayed_progress(progress_title.buf, 0); |
| ctx->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) { |
| error(_("error adding pack %s"), packname.buf); |
| return -1; |
| } |
| if (open_pack_index(p)) { |
| error(_("error opening index for %s"), packname.buf); |
| return -1; |
| } |
| for_each_object_in_pack(p, add_packed_commits, ctx, |
| FOR_EACH_OBJECT_PACK_ORDER); |
| close_pack(p); |
| free(p); |
| } |
| |
| stop_progress(&ctx->progress); |
| strbuf_release(&progress_title); |
| strbuf_release(&packname); |
| |
| return 0; |
| } |
| |
| static int fill_oids_from_commit_hex(struct write_commit_graph_context *ctx, |
| struct string_list *commit_hex) |
| { |
| uint32_t i; |
| struct strbuf progress_title = STRBUF_INIT; |
| |
| if (ctx->report_progress) { |
| strbuf_addf(&progress_title, |
| Q_("Finding commits for commit graph from %d ref", |
| "Finding commits for commit graph from %d refs", |
| commit_hex->nr), |
| commit_hex->nr); |
| ctx->progress = start_delayed_progress( |
| progress_title.buf, |
| commit_hex->nr); |
| } |
| for (i = 0; i < commit_hex->nr; i++) { |
| const char *end; |
| struct object_id oid; |
| struct commit *result; |
| |
| display_progress(ctx->progress, i + 1); |
| if (!parse_oid_hex(commit_hex->items[i].string, &oid, &end) && |
| (result = lookup_commit_reference_gently(ctx->r, &oid, 1))) { |
| ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); |
| oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid)); |
| ctx->oids.nr++; |
| } else if (ctx->check_oids) { |
| error(_("invalid commit object id: %s"), |
| commit_hex->items[i].string); |
| return -1; |
| } |
| } |
| stop_progress(&ctx->progress); |
| strbuf_release(&progress_title); |
| |
| return 0; |
| } |
| |
| static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx) |
| { |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Finding commits for commit graph among packed objects"), |
| ctx->approx_nr_objects); |
| for_each_packed_object(add_packed_commits, ctx, |
| FOR_EACH_OBJECT_PACK_ORDER); |
| if (ctx->progress_done < ctx->approx_nr_objects) |
| display_progress(ctx->progress, ctx->approx_nr_objects); |
| stop_progress(&ctx->progress); |
| } |
| |
| static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx) |
| { |
| uint32_t i, count_distinct = 1; |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Counting distinct commits in commit graph"), |
| ctx->oids.nr); |
| display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */ |
| QSORT(ctx->oids.list, ctx->oids.nr, oid_compare); |
| |
| for (i = 1; i < ctx->oids.nr; i++) { |
| display_progress(ctx->progress, i + 1); |
| if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) { |
| if (ctx->split) { |
| struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]); |
| |
| if (!c || c->graph_pos != COMMIT_NOT_FROM_GRAPH) |
| continue; |
| } |
| |
| count_distinct++; |
| } |
| } |
| stop_progress(&ctx->progress); |
| |
| return count_distinct; |
| } |
| |
| static void copy_oids_to_commits(struct write_commit_graph_context *ctx) |
| { |
| uint32_t i; |
| |
| ctx->num_extra_edges = 0; |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Finding extra edges in commit graph"), |
| ctx->oids.nr); |
| for (i = 0; i < ctx->oids.nr; i++) { |
| unsigned int num_parents; |
| |
| display_progress(ctx->progress, i + 1); |
| if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) |
| continue; |
| |
| ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc); |
| ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]); |
| |
| if (ctx->split && |
| ctx->commits.list[ctx->commits.nr]->graph_pos != COMMIT_NOT_FROM_GRAPH) |
| continue; |
| |
| parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]); |
| |
| num_parents = commit_list_count(ctx->commits.list[ctx->commits.nr]->parents); |
| if (num_parents > 2) |
| ctx->num_extra_edges += num_parents - 1; |
| |
| ctx->commits.nr++; |
| } |
| stop_progress(&ctx->progress); |
| } |
| |
| static int write_graph_chunk_base_1(struct hashfile *f, |
| struct commit_graph *g) |
| { |
| int num = 0; |
| |
| if (!g) |
| return 0; |
| |
| num = write_graph_chunk_base_1(f, g->base_graph); |
| hashwrite(f, g->oid.hash, the_hash_algo->rawsz); |
| return num + 1; |
| } |
| |
| static int write_graph_chunk_base(struct hashfile *f, |
| struct write_commit_graph_context *ctx) |
| { |
| int num = write_graph_chunk_base_1(f, ctx->new_base_graph); |
| |
| if (num != ctx->num_commit_graphs_after - 1) { |
| error(_("failed to write correct number of base graph ids")); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int write_commit_graph_file(struct write_commit_graph_context *ctx) |
| { |
| uint32_t i; |
| int fd; |
| struct hashfile *f; |
| struct lock_file lk = LOCK_INIT; |
| uint32_t chunk_ids[6]; |
| uint64_t chunk_offsets[6]; |
| const unsigned hashsz = the_hash_algo->rawsz; |
| struct strbuf progress_title = STRBUF_INIT; |
| int num_chunks = 3; |
| struct object_id file_hash; |
| |
| if (ctx->split) { |
| struct strbuf tmp_file = STRBUF_INIT; |
| |
| strbuf_addf(&tmp_file, |
| "%s/info/commit-graphs/tmp_graph_XXXXXX", |
| ctx->odb->path); |
| ctx->graph_name = strbuf_detach(&tmp_file, NULL); |
| } else { |
| ctx->graph_name = get_commit_graph_filename(ctx->odb); |
| } |
| |
| if (safe_create_leading_directories(ctx->graph_name)) { |
| UNLEAK(ctx->graph_name); |
| error(_("unable to create leading directories of %s"), |
| ctx->graph_name); |
| return -1; |
| } |
| |
| if (ctx->split) { |
| char *lock_name = get_chain_filename(ctx->odb); |
| |
| hold_lock_file_for_update(&lk, lock_name, LOCK_DIE_ON_ERROR); |
| |
| fd = git_mkstemp_mode(ctx->graph_name, 0444); |
| if (fd < 0) { |
| error(_("unable to create '%s'"), ctx->graph_name); |
| return -1; |
| } |
| |
| f = hashfd(fd, ctx->graph_name); |
| } else { |
| hold_lock_file_for_update(&lk, ctx->graph_name, LOCK_DIE_ON_ERROR); |
| fd = lk.tempfile->fd; |
| f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); |
| } |
| |
| chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT; |
| chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP; |
| chunk_ids[2] = GRAPH_CHUNKID_DATA; |
| if (ctx->num_extra_edges) { |
| chunk_ids[num_chunks] = GRAPH_CHUNKID_EXTRAEDGES; |
| num_chunks++; |
| } |
| if (ctx->num_commit_graphs_after > 1) { |
| chunk_ids[num_chunks] = GRAPH_CHUNKID_BASE; |
| num_chunks++; |
| } |
| |
| chunk_ids[num_chunks] = 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] + hashsz * ctx->commits.nr; |
| chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr; |
| |
| num_chunks = 3; |
| if (ctx->num_extra_edges) { |
| chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] + |
| 4 * ctx->num_extra_edges; |
| num_chunks++; |
| } |
| if (ctx->num_commit_graphs_after > 1) { |
| chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] + |
| hashsz * (ctx->num_commit_graphs_after - 1); |
| num_chunks++; |
| } |
| |
| hashwrite_be32(f, GRAPH_SIGNATURE); |
| |
| hashwrite_u8(f, GRAPH_VERSION); |
| hashwrite_u8(f, oid_version()); |
| hashwrite_u8(f, num_chunks); |
| hashwrite_u8(f, ctx->num_commit_graphs_after - 1); |
| |
| 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); |
| } |
| |
| if (ctx->report_progress) { |
| strbuf_addf(&progress_title, |
| Q_("Writing out commit graph in %d pass", |
| "Writing out commit graph in %d passes", |
| num_chunks), |
| num_chunks); |
| ctx->progress = start_delayed_progress( |
| progress_title.buf, |
| num_chunks * ctx->commits.nr); |
| } |
| write_graph_chunk_fanout(f, ctx); |
| write_graph_chunk_oids(f, hashsz, ctx); |
| write_graph_chunk_data(f, hashsz, ctx); |
| if (ctx->num_extra_edges) |
| write_graph_chunk_extra_edges(f, ctx); |
| if (ctx->num_commit_graphs_after > 1 && |
| write_graph_chunk_base(f, ctx)) { |
| return -1; |
| } |
| stop_progress(&ctx->progress); |
| strbuf_release(&progress_title); |
| |
| if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) { |
| char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid)); |
| char *new_base_name = get_split_graph_filename(ctx->new_base_graph->odb, new_base_hash); |
| |
| free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]); |
| free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]); |
| ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name; |
| ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash; |
| } |
| |
| close_commit_graph(ctx->r->objects); |
| finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC); |
| |
| if (ctx->split) { |
| FILE *chainf = fdopen_lock_file(&lk, "w"); |
| char *final_graph_name; |
| int result; |
| |
| close(fd); |
| |
| if (!chainf) { |
| error(_("unable to open commit-graph chain file")); |
| return -1; |
| } |
| |
| if (ctx->base_graph_name) { |
| const char *dest = ctx->commit_graph_filenames_after[ |
| ctx->num_commit_graphs_after - 2]; |
| |
| if (strcmp(ctx->base_graph_name, dest)) { |
| result = rename(ctx->base_graph_name, dest); |
| |
| if (result) { |
| error(_("failed to rename base commit-graph file")); |
| return -1; |
| } |
| } |
| } else { |
| char *graph_name = get_commit_graph_filename(ctx->odb); |
| unlink(graph_name); |
| } |
| |
| ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash)); |
| final_graph_name = get_split_graph_filename(ctx->odb, |
| ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]); |
| ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name; |
| |
| result = rename(ctx->graph_name, final_graph_name); |
| |
| for (i = 0; i < ctx->num_commit_graphs_after; i++) |
| fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]); |
| |
| if (result) { |
| error(_("failed to rename temporary commit-graph file")); |
| return -1; |
| } |
| } |
| |
| commit_lock_file(&lk); |
| |
| return 0; |
| } |
| |
| static void split_graph_merge_strategy(struct write_commit_graph_context *ctx) |
| { |
| struct commit_graph *g; |
| uint32_t num_commits; |
| uint32_t i; |
| |
| int max_commits = 0; |
| int size_mult = 2; |
| |
| if (ctx->split_opts) { |
| max_commits = ctx->split_opts->max_commits; |
| |
| if (ctx->split_opts->size_multiple) |
| size_mult = ctx->split_opts->size_multiple; |
| } |
| |
| g = ctx->r->objects->commit_graph; |
| num_commits = ctx->commits.nr; |
| ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1; |
| |
| while (g && (g->num_commits <= size_mult * num_commits || |
| (max_commits && num_commits > max_commits))) { |
| if (g->odb != ctx->odb) |
| break; |
| |
| num_commits += g->num_commits; |
| g = g->base_graph; |
| |
| ctx->num_commit_graphs_after--; |
| } |
| |
| ctx->new_base_graph = g; |
| |
| if (ctx->num_commit_graphs_after == 2) { |
| char *old_graph_name = get_commit_graph_filename(g->odb); |
| |
| if (!strcmp(g->filename, old_graph_name) && |
| g->odb != ctx->odb) { |
| ctx->num_commit_graphs_after = 1; |
| ctx->new_base_graph = NULL; |
| } |
| |
| free(old_graph_name); |
| } |
| |
| ALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after); |
| ALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after); |
| |
| for (i = 0; i < ctx->num_commit_graphs_after && |
| i < ctx->num_commit_graphs_before; i++) |
| ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]); |
| |
| i = ctx->num_commit_graphs_before - 1; |
| g = ctx->r->objects->commit_graph; |
| |
| while (g) { |
| if (i < ctx->num_commit_graphs_after) |
| ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid)); |
| |
| i--; |
| g = g->base_graph; |
| } |
| } |
| |
| static void merge_commit_graph(struct write_commit_graph_context *ctx, |
| struct commit_graph *g) |
| { |
| uint32_t i; |
| uint32_t offset = g->num_commits_in_base; |
| |
| ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc); |
| |
| for (i = 0; i < g->num_commits; i++) { |
| struct object_id oid; |
| struct commit *result; |
| |
| display_progress(ctx->progress, i + 1); |
| |
| load_oid_from_graph(g, i + offset, &oid); |
| |
| /* only add commits if they still exist in the repo */ |
| result = lookup_commit_reference_gently(ctx->r, &oid, 1); |
| |
| if (result) { |
| ctx->commits.list[ctx->commits.nr] = result; |
| ctx->commits.nr++; |
| } |
| } |
| } |
| |
| static int commit_compare(const void *_a, const void *_b) |
| { |
| const struct commit *a = *(const struct commit **)_a; |
| const struct commit *b = *(const struct commit **)_b; |
| return oidcmp(&a->object.oid, &b->object.oid); |
| } |
| |
| static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx) |
| { |
| uint32_t i; |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress( |
| _("Scanning merged commits"), |
| ctx->commits.nr); |
| |
| QSORT(ctx->commits.list, ctx->commits.nr, commit_compare); |
| |
| ctx->num_extra_edges = 0; |
| for (i = 0; i < ctx->commits.nr; i++) { |
| display_progress(ctx->progress, i); |
| |
| if (i && oideq(&ctx->commits.list[i - 1]->object.oid, |
| &ctx->commits.list[i]->object.oid)) { |
| die(_("unexpected duplicate commit id %s"), |
| oid_to_hex(&ctx->commits.list[i]->object.oid)); |
| } else { |
| unsigned int num_parents; |
| |
| num_parents = commit_list_count(ctx->commits.list[i]->parents); |
| if (num_parents > 2) |
| ctx->num_extra_edges += num_parents - 1; |
| } |
| } |
| |
| stop_progress(&ctx->progress); |
| } |
| |
| static void merge_commit_graphs(struct write_commit_graph_context *ctx) |
| { |
| struct commit_graph *g = ctx->r->objects->commit_graph; |
| uint32_t current_graph_number = ctx->num_commit_graphs_before; |
| |
| while (g && current_graph_number >= ctx->num_commit_graphs_after) { |
| current_graph_number--; |
| |
| if (ctx->report_progress) |
| ctx->progress = start_delayed_progress(_("Merging commit-graph"), 0); |
| |
| merge_commit_graph(ctx, g); |
| stop_progress(&ctx->progress); |
| |
| g = g->base_graph; |
| } |
| |
| if (g) { |
| ctx->new_base_graph = g; |
| ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base; |
| } |
| |
| if (ctx->new_base_graph) |
| ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename); |
| |
| sort_and_scan_merged_commits(ctx); |
| } |
| |
| static void mark_commit_graphs(struct write_commit_graph_context *ctx) |
| { |
| uint32_t i; |
| time_t now = time(NULL); |
| |
| for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) { |
| struct stat st; |
| struct utimbuf updated_time; |
| |
| stat(ctx->commit_graph_filenames_before[i], &st); |
| |
| updated_time.actime = st.st_atime; |
| updated_time.modtime = now; |
| utime(ctx->commit_graph_filenames_before[i], &updated_time); |
| } |
| } |
| |
| static void expire_commit_graphs(struct write_commit_graph_context *ctx) |
| { |
| struct strbuf path = STRBUF_INIT; |
| DIR *dir; |
| struct dirent *de; |
| size_t dirnamelen; |
| timestamp_t expire_time = time(NULL); |
| |
| if (ctx->split_opts && ctx->split_opts->expire_time) |
| expire_time -= ctx->split_opts->expire_time; |
| if (!ctx->split) { |
| char *chain_file_name = get_chain_filename(ctx->odb); |
| unlink(chain_file_name); |
| free(chain_file_name); |
| ctx->num_commit_graphs_after = 0; |
| } |
| |
| strbuf_addstr(&path, ctx->odb->path); |
| strbuf_addstr(&path, "/info/commit-graphs"); |
| dir = opendir(path.buf); |
| |
| if (!dir) |
| goto out; |
| |
| strbuf_addch(&path, '/'); |
| dirnamelen = path.len; |
| while ((de = readdir(dir)) != NULL) { |
| struct stat st; |
| uint32_t i, found = 0; |
| |
| strbuf_setlen(&path, dirnamelen); |
| strbuf_addstr(&path, de->d_name); |
| |
| stat(path.buf, &st); |
| |
| if (st.st_mtime > expire_time) |
| continue; |
| if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph")) |
| continue; |
| |
| for (i = 0; i < ctx->num_commit_graphs_after; i++) { |
| if (!strcmp(ctx->commit_graph_filenames_after[i], |
| path.buf)) { |
| found = 1; |
| break; |
| } |
| } |
| |
| if (!found) |
| unlink(path.buf); |
| } |
| |
| out: |
| strbuf_release(&path); |
| } |
| |
| int write_commit_graph(struct object_directory *odb, |
| struct string_list *pack_indexes, |
| struct string_list *commit_hex, |
| enum commit_graph_write_flags flags, |
| const struct split_commit_graph_opts *split_opts) |
| { |
| struct write_commit_graph_context *ctx; |
| uint32_t i, count_distinct = 0; |
| int res = 0; |
| |
| if (!commit_graph_compatible(the_repository)) |
| return 0; |
| |
| ctx = xcalloc(1, sizeof(struct write_commit_graph_context)); |
| ctx->r = the_repository; |
| ctx->odb = odb; |
| ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0; |
| ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0; |
| ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0; |
| ctx->check_oids = flags & COMMIT_GRAPH_WRITE_CHECK_OIDS ? 1 : 0; |
| ctx->split_opts = split_opts; |
| |
| if (ctx->split) { |
| struct commit_graph *g; |
| prepare_commit_graph(ctx->r); |
| |
| g = ctx->r->objects->commit_graph; |
| |
| while (g) { |
| ctx->num_commit_graphs_before++; |
| g = g->base_graph; |
| } |
| |
| if (ctx->num_commit_graphs_before) { |
| ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before); |
| i = ctx->num_commit_graphs_before; |
| g = ctx->r->objects->commit_graph; |
| |
| while (g) { |
| ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename); |
| g = g->base_graph; |
| } |
| } |
| } |
| |
| ctx->approx_nr_objects = approximate_object_count(); |
| ctx->oids.alloc = ctx->approx_nr_objects / 32; |
| |
| if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits) |
| ctx->oids.alloc = split_opts->max_commits; |
| |
| if (ctx->append) { |
| prepare_commit_graph_one(ctx->r, ctx->odb); |
| if (ctx->r->objects->commit_graph) |
| ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits; |
| } |
| |
| if (ctx->oids.alloc < 1024) |
| ctx->oids.alloc = 1024; |
| ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc); |
| |
| if (ctx->append && ctx->r->objects->commit_graph) { |
| struct commit_graph *g = ctx->r->objects->commit_graph; |
| for (i = 0; i < g->num_commits; i++) { |
| const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i; |
| hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash); |
| } |
| } |
| |
| if (pack_indexes) { |
| if ((res = fill_oids_from_packs(ctx, pack_indexes))) |
| goto cleanup; |
| } |
| |
| if (commit_hex) { |
| if ((res = fill_oids_from_commit_hex(ctx, commit_hex))) |
| goto cleanup; |
| } |
| |
| if (!pack_indexes && !commit_hex) |
| fill_oids_from_all_packs(ctx); |
| |
| close_reachable(ctx); |
| |
| count_distinct = count_distinct_commits(ctx); |
| |
| if (count_distinct >= GRAPH_EDGE_LAST_MASK) { |
| error(_("the commit graph format cannot write %d commits"), count_distinct); |
| res = -1; |
| goto cleanup; |
| } |
| |
| ctx->commits.alloc = count_distinct; |
| ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc); |
| |
| copy_oids_to_commits(ctx); |
| |
| if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) { |
| error(_("too many commits to write graph")); |
| res = -1; |
| goto cleanup; |
| } |
| |
| if (!ctx->commits.nr) |
| goto cleanup; |
| |
| if (ctx->split) { |
| split_graph_merge_strategy(ctx); |
| |
| merge_commit_graphs(ctx); |
| } else |
| ctx->num_commit_graphs_after = 1; |
| |
| compute_generation_numbers(ctx); |
| |
| res = write_commit_graph_file(ctx); |
| |
| if (ctx->split) |
| mark_commit_graphs(ctx); |
| |
| expire_commit_graphs(ctx); |
| |
| cleanup: |
| free(ctx->graph_name); |
| free(ctx->commits.list); |
| free(ctx->oids.list); |
| |
| if (ctx->commit_graph_filenames_after) { |
| for (i = 0; i < ctx->num_commit_graphs_after; i++) { |
| free(ctx->commit_graph_filenames_after[i]); |
| free(ctx->commit_graph_hash_after[i]); |
| } |
| |
| for (i = 0; i < ctx->num_commit_graphs_before; i++) |
| free(ctx->commit_graph_filenames_before[i]); |
| |
| free(ctx->commit_graph_filenames_after); |
| free(ctx->commit_graph_filenames_before); |
| free(ctx->commit_graph_hash_after); |
| } |
| |
| free(ctx); |
| |
| return res; |
| } |
| |
| #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, int flags) |
| { |
| 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; |
| int local_error = 0; |
| |
| if (!g) { |
| graph_report("no commit-graph file loaded"); |
| return 1; |
| } |
| |
| verify_commit_graph_error = verify_commit_graph_lite(g); |
| 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(r, g, graph_commit)) |
| graph_report(_("failed to parse commit %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; |
| |
| if (flags & COMMIT_GRAPH_WRITE_PROGRESS) |
| 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, alloc_commit_node(r)); |
| if (parse_commit_internal(odb_commit, 0, 0)) { |
| graph_report(_("failed to parse commit %s from object database for commit-graph"), |
| oid_to_hex(&cur_oid)); |
| continue; |
| } |
| |
| if (!oideq(&get_commit_tree_in_graph_one(r, 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; |
| } |
| |
| /* parse parent in case it is in a base graph */ |
| parse_commit_in_graph_one(r, g, graph_parents->item); |
| |
| 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); |
| |
| local_error = verify_commit_graph_error; |
| |
| if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph) |
| local_error |= verify_commit_graph(r, g->base_graph, flags); |
| |
| return local_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->filename); |
| free(g); |
| } |
| |
| void disable_commit_graph(struct repository *r) |
| { |
| r->commit_graph_disabled = 1; |
| } |