diff options
Diffstat (limited to 'third_party/git/commit-graph.c')
-rw-r--r-- | third_party/git/commit-graph.c | 2097 |
1 files changed, 0 insertions, 2097 deletions
diff --git a/third_party/git/commit-graph.c b/third_party/git/commit-graph.c deleted file mode 100644 index fe954ab5f8..0000000000 --- a/third_party/git/commit-graph.c +++ /dev/null @@ -1,2097 +0,0 @@ -#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) - -char *get_commit_graph_filename(const char *obj_dir) -{ - char *filename = xstrfmt("%s/info/commit-graph", obj_dir); - char *normalized = xmalloc(strlen(filename) + 1); - normalize_path_copy(normalized, filename); - free(filename); - return normalized; -} - -static char *get_split_graph_filename(const char *obj_dir, - const char *oid_hex) -{ - char *filename = xstrfmt("%s/info/commit-graphs/graph-%s.graph", - obj_dir, - oid_hex); - char *normalized = xmalloc(strlen(filename) + 1); - normalize_path_copy(normalized, filename); - free(filename); - return normalized; -} - -static char *get_chain_filename(const char *obj_dir) -{ - return xstrfmt("%s/info/commit-graphs/commit-graph-chain", obj_dir); -} - -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) -{ - 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) { - 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 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); - - if (g) - g->filename = xstrdup(graph_file); - - return g; -} - -static struct commit_graph *load_commit_graph_v1(struct repository *r, const char *obj_dir) -{ - char *graph_name = get_commit_graph_filename(obj_dir); - struct commit_graph *g = load_commit_graph_one(graph_name); - free(graph_name); - - if (g) - g->obj_dir = obj_dir; - - 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, const char *obj_dir) -{ - 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(obj_dir); - 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->path, line.buf); - struct commit_graph *g = load_commit_graph_one(graph_name); - - free(graph_name); - - if (g) { - g->obj_dir = odb->path; - - 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, const char *obj_dir) -{ - struct commit_graph *g = load_commit_graph_v1(r, obj_dir); - - if (!g) - g = load_commit_graph_chain(r, obj_dir); - - return g; -} - -static void prepare_commit_graph_one(struct repository *r, const char *obj_dir) -{ - - if (r->objects->commit_graph) - return; - - r->objects->commit_graph = read_commit_graph_one(r, obj_dir); -} - -/* - * 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 object_directory *odb; - int config_value; - - 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); - - 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; - - prepare_alt_odb(r); - for (odb = r->objects->odb; - !r->objects->commit_graph && odb; - odb = odb->next) - prepare_commit_graph_one(r, odb->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; -} - -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; - char *obj_dir; - 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; - - 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; - int edge_value; - uint32_t packedDate[2]; - display_progress(ctx->progress, ++ctx->progress_cnt); - - parse_commit_no_graph(*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, - 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 & UNINTERESTING)) { - 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 |= UNINTERESTING; - } - } -} - -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 |= UNINTERESTING; - } - 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"), - 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) - 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 &= ~UNINTERESTING; - } - 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_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(const char *obj_dir, unsigned int 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(obj_dir, 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->obj_dir); - 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 void 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 (commit_hex->items[i].string && - parse_oid_hex(commit_hex->items[i].string, &oid, &end)) - continue; - - result = lookup_commit_reference_gently(ctx->r, &oid, 1); - - if (result) { - 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++; - } - } - stop_progress(&ctx->progress); - strbuf_release(&progress_title); -} - -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; - struct commit_list *parent; - - 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++) { - int num_parents = 0; - 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]); - - for (parent = ctx->commits.list[ctx->commits.nr]->parents; - parent; parent = parent->next) - num_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->obj_dir); - ctx->graph_name = strbuf_detach(&tmp_file, NULL); - } else { - ctx->graph_name = get_commit_graph_filename(ctx->obj_dir); - } - - 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->obj_dir); - - 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->obj_dir, 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->obj_dir); - 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->obj_dir, - 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 = ctx->r->objects->commit_graph; - uint32_t num_commits = ctx->commits.nr; - uint32_t i; - - int max_commits = 0; - int size_mult = 2; - - if (ctx->split_opts) { - max_commits = ctx->split_opts->max_commits; - size_mult = ctx->split_opts->size_multiple; - } - - g = ctx->r->objects->commit_graph; - 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 (strcmp(g->obj_dir, ctx->obj_dir)) - 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->obj_dir); - - if (!strcmp(g->filename, old_graph_name) && - strcmp(g->obj_dir, ctx->obj_dir)) { - 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, num_parents; - struct commit_list *parent; - - 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 { - num_parents = 0; - for (parent = ctx->commits.list[i]->parents; parent; parent = parent->next) - num_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; - struct strbuf progress_title = STRBUF_INIT; - - while (g && current_graph_number >= ctx->num_commit_graphs_after) { - current_graph_number--; - - if (ctx->report_progress) { - strbuf_addstr(&progress_title, _("Merging commit-graph")); - ctx->progress = start_delayed_progress(progress_title.buf, 0); - } - - merge_commit_graph(ctx, g); - stop_progress(&ctx->progress); - strbuf_release(&progress_title); - - 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->obj_dir); - unlink(chain_file_name); - free(chain_file_name); - ctx->num_commit_graphs_after = 0; - } - - strbuf_addstr(&path, ctx->obj_dir); - 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(const char *obj_dir, - struct string_list *pack_indexes, - struct string_list *commit_hex, - unsigned int flags, - const struct split_commit_graph_opts *split_opts) -{ - struct write_commit_graph_context *ctx; - uint32_t i, count_distinct = 0; - size_t len; - int res = 0; - - if (!commit_graph_compatible(the_repository)) - return 0; - - ctx = xcalloc(1, sizeof(struct write_commit_graph_context)); - ctx->r = the_repository; - - /* normalize object dir with no trailing slash */ - ctx->obj_dir = xmallocz(strlen(obj_dir) + 1); - normalize_path_copy(ctx->obj_dir, obj_dir); - len = strlen(ctx->obj_dir); - if (len && ctx->obj_dir[len - 1] == '/') - ctx->obj_dir[len - 1] = 0; - - ctx->append = flags & COMMIT_GRAPH_APPEND ? 1 : 0; - ctx->report_progress = flags & COMMIT_GRAPH_PROGRESS ? 1 : 0; - ctx->split = flags & COMMIT_GRAPH_SPLIT ? 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->obj_dir); - 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) - fill_oids_from_commit_hex(ctx, commit_hex); - - 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); - free(ctx->obj_dir); - - 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; - - 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); -} |