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-rw-r--r--commit-graph.c2886
1 files changed, 2886 insertions, 0 deletions
diff --git a/commit-graph.c b/commit-graph.c
new file mode 100644
index 0000000..ee66098
--- /dev/null
+++ b/commit-graph.c
@@ -0,0 +1,2886 @@
+#include "git-compat-util.h"
+#include "config.h"
+#include "gettext.h"
+#include "hex.h"
+#include "lockfile.h"
+#include "pack.h"
+#include "packfile.h"
+#include "commit.h"
+#include "object.h"
+#include "refs.h"
+#include "revision.h"
+#include "hash-lookup.h"
+#include "commit-graph.h"
+#include "object-file.h"
+#include "object-store-ll.h"
+#include "oid-array.h"
+#include "path.h"
+#include "alloc.h"
+#include "hashmap.h"
+#include "replace-object.h"
+#include "progress.h"
+#include "bloom.h"
+#include "commit-slab.h"
+#include "shallow.h"
+#include "json-writer.h"
+#include "trace2.h"
+#include "tree.h"
+#include "chunk-format.h"
+
+void git_test_write_commit_graph_or_die(void)
+{
+ int flags = 0;
+ if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0))
+ return;
+
+ if (git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
+ flags = COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
+
+ if (write_commit_graph_reachable(the_repository->objects->odb,
+ flags, NULL))
+ die("failed to write commit-graph under GIT_TEST_COMMIT_GRAPH");
+}
+
+#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_GENERATION_DATA 0x47444132 /* "GDA2" */
+#define GRAPH_CHUNKID_GENERATION_DATA_OVERFLOW 0x47444f32 /* "GDO2" */
+#define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
+#define GRAPH_CHUNKID_BLOOMINDEXES 0x42494458 /* "BIDX" */
+#define GRAPH_CHUNKID_BLOOMDATA 0x42444154 /* "BDAT" */
+#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_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * CHUNK_TOC_ENTRY_SIZE \
+ + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
+
+#define CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW (1ULL << 31)
+
+/* Remember to update object flag allocation in object.h */
+#define REACHABLE (1u<<15)
+
+define_commit_slab(topo_level_slab, uint32_t);
+
+/* Keep track of the order in which commits are added to our list. */
+define_commit_slab(commit_pos, int);
+static struct commit_pos commit_pos = COMMIT_SLAB_INIT(1, commit_pos);
+
+static void set_commit_pos(struct repository *r, const struct object_id *oid)
+{
+ static int32_t max_pos;
+ struct commit *commit = lookup_commit(r, oid);
+
+ if (!commit)
+ return; /* should never happen, but be lenient */
+
+ *commit_pos_at(&commit_pos, commit) = max_pos++;
+}
+
+static int commit_pos_cmp(const void *va, const void *vb)
+{
+ const struct commit *a = *(const struct commit **)va;
+ const struct commit *b = *(const struct commit **)vb;
+ return commit_pos_at(&commit_pos, a) -
+ commit_pos_at(&commit_pos, b);
+}
+
+define_commit_slab(commit_graph_data_slab, struct commit_graph_data);
+static struct commit_graph_data_slab commit_graph_data_slab =
+ COMMIT_SLAB_INIT(1, commit_graph_data_slab);
+
+static int get_configured_generation_version(struct repository *r)
+{
+ int version = 2;
+ repo_config_get_int(r, "commitgraph.generationversion", &version);
+ return version;
+}
+
+uint32_t commit_graph_position(const struct commit *c)
+{
+ struct commit_graph_data *data =
+ commit_graph_data_slab_peek(&commit_graph_data_slab, c);
+
+ return data ? data->graph_pos : COMMIT_NOT_FROM_GRAPH;
+}
+
+timestamp_t commit_graph_generation(const struct commit *c)
+{
+ struct commit_graph_data *data =
+ commit_graph_data_slab_peek(&commit_graph_data_slab, c);
+
+ if (data && data->generation)
+ return data->generation;
+
+ return GENERATION_NUMBER_INFINITY;
+}
+
+static timestamp_t commit_graph_generation_from_graph(const struct commit *c)
+{
+ struct commit_graph_data *data =
+ commit_graph_data_slab_peek(&commit_graph_data_slab, c);
+
+ if (!data || data->graph_pos == COMMIT_NOT_FROM_GRAPH)
+ return GENERATION_NUMBER_INFINITY;
+ return data->generation;
+}
+
+static struct commit_graph_data *commit_graph_data_at(const struct commit *c)
+{
+ unsigned int i, nth_slab;
+ struct commit_graph_data *data =
+ commit_graph_data_slab_peek(&commit_graph_data_slab, c);
+
+ if (data)
+ return data;
+
+ nth_slab = c->index / commit_graph_data_slab.slab_size;
+ data = commit_graph_data_slab_at(&commit_graph_data_slab, c);
+
+ /*
+ * commit-slab initializes elements with zero, overwrite this with
+ * COMMIT_NOT_FROM_GRAPH for graph_pos.
+ *
+ * We avoid initializing generation with checking if graph position
+ * is not COMMIT_NOT_FROM_GRAPH.
+ */
+ for (i = 0; i < commit_graph_data_slab.slab_size; i++) {
+ commit_graph_data_slab.slab[nth_slab][i].graph_pos =
+ COMMIT_NOT_FROM_GRAPH;
+ }
+
+ return data;
+}
+
+/*
+ * Should be used only while writing commit-graph as it compares
+ * generation value of commits by directly accessing commit-slab.
+ */
+static int commit_gen_cmp(const void *va, const void *vb)
+{
+ const struct commit *a = *(const struct commit **)va;
+ const struct commit *b = *(const struct commit **)vb;
+
+ const timestamp_t generation_a = commit_graph_data_at(a)->generation;
+ const timestamp_t generation_b = commit_graph_data_at(b)->generation;
+ /* lower generation commits first */
+ if (generation_a < generation_b)
+ return -1;
+ else if (generation_a > generation_b)
+ return 1;
+
+ /* use date as a heuristic when generations are equal */
+ if (a->date < b->date)
+ return -1;
+ else if (a->date > b->date)
+ return 1;
+ return 0;
+}
+
+char *get_commit_graph_filename(struct object_directory *obj_dir)
+{
+ return xstrfmt("%s/info/commit-graph", obj_dir->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);
+}
+
+char *get_commit_graph_chain_filename(struct object_directory *odb)
+{
+ return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
+}
+
+static struct commit_graph *alloc_commit_graph(void)
+{
+ struct commit_graph *g = xcalloc(1, sizeof(*g));
+
+ return g;
+}
+
+static int commit_graph_compatible(struct repository *r)
+{
+ if (!r->gitdir)
+ return 0;
+
+ if (replace_refs_enabled(r)) {
+ 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 || r->parsed_objects->substituted_parent))
+ 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(struct repository *r,
+ 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);
+ close(fd);
+ prepare_repo_settings(r);
+ ret = parse_commit_graph(&r->settings, graph_map, graph_size);
+
+ if (ret)
+ ret->odb = odb;
+ else
+ munmap(graph_map, graph_size);
+
+ return ret;
+}
+
+static int verify_commit_graph_lite(struct commit_graph *g)
+{
+ int i;
+
+ /*
+ * 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;
+ }
+
+ for (i = 0; i < 255; i++) {
+ uint32_t oid_fanout1 = ntohl(g->chunk_oid_fanout[i]);
+ uint32_t oid_fanout2 = ntohl(g->chunk_oid_fanout[i + 1]);
+
+ if (oid_fanout1 > oid_fanout2) {
+ error("commit-graph fanout values out of order");
+ return 1;
+ }
+ }
+ if (ntohl(g->chunk_oid_fanout[255]) != g->num_commits) {
+ error("commit-graph oid table and fanout disagree on size");
+ return 1;
+ }
+
+ return 0;
+}
+
+static int graph_read_oid_fanout(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ if (chunk_size != 256 * sizeof(uint32_t))
+ return error("commit-graph oid fanout chunk is wrong size");
+ g->chunk_oid_fanout = (const uint32_t *)chunk_start;
+ return 0;
+}
+
+static int graph_read_oid_lookup(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ g->chunk_oid_lookup = chunk_start;
+ g->num_commits = chunk_size / g->hash_len;
+ return 0;
+}
+
+static int graph_read_commit_data(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ if (chunk_size != g->num_commits * GRAPH_DATA_WIDTH)
+ return error("commit-graph commit data chunk is wrong size");
+ g->chunk_commit_data = chunk_start;
+ return 0;
+}
+
+static int graph_read_generation_data(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ if (chunk_size != g->num_commits * sizeof(uint32_t))
+ return error("commit-graph generations chunk is wrong size");
+ g->chunk_generation_data = chunk_start;
+ return 0;
+}
+
+static int graph_read_bloom_index(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ if (chunk_size != g->num_commits * 4) {
+ warning("commit-graph changed-path index chunk is too small");
+ return -1;
+ }
+ g->chunk_bloom_indexes = chunk_start;
+ return 0;
+}
+
+static int graph_read_bloom_data(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct commit_graph *g = data;
+ uint32_t hash_version;
+
+ if (chunk_size < BLOOMDATA_CHUNK_HEADER_SIZE) {
+ warning("ignoring too-small changed-path chunk"
+ " (%"PRIuMAX" < %"PRIuMAX") in commit-graph file",
+ (uintmax_t)chunk_size,
+ (uintmax_t)BLOOMDATA_CHUNK_HEADER_SIZE);
+ return -1;
+ }
+
+ g->chunk_bloom_data = chunk_start;
+ g->chunk_bloom_data_size = chunk_size;
+ hash_version = get_be32(chunk_start);
+
+ if (hash_version != 1)
+ return 0;
+
+ g->bloom_filter_settings = xmalloc(sizeof(struct bloom_filter_settings));
+ g->bloom_filter_settings->hash_version = hash_version;
+ g->bloom_filter_settings->num_hashes = get_be32(chunk_start + 4);
+ g->bloom_filter_settings->bits_per_entry = get_be32(chunk_start + 8);
+ g->bloom_filter_settings->max_changed_paths = DEFAULT_BLOOM_MAX_CHANGES;
+
+ return 0;
+}
+
+struct commit_graph *parse_commit_graph(struct repo_settings *s,
+ void *graph_map, size_t graph_size)
+{
+ const unsigned char *data;
+ struct commit_graph *graph;
+ uint32_t graph_signature;
+ unsigned char graph_version, hash_version;
+ struct chunkfile *cf = NULL;
+
+ 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(the_hash_algo)) {
+ error(_("commit-graph hash version %X does not match version %X"),
+ hash_version, oid_version(the_hash_algo));
+ return NULL;
+ }
+
+ graph = alloc_commit_graph();
+
+ graph->hash_len = the_hash_algo->rawsz;
+ graph->num_chunks = *(unsigned char*)(data + 6);
+ graph->data = graph_map;
+ graph->data_len = graph_size;
+
+ if (graph_size < GRAPH_HEADER_SIZE +
+ (graph->num_chunks + 1) * CHUNK_TOC_ENTRY_SIZE +
+ GRAPH_FANOUT_SIZE + the_hash_algo->rawsz) {
+ error(_("commit-graph file is too small to hold %u chunks"),
+ graph->num_chunks);
+ free(graph);
+ return NULL;
+ }
+
+ cf = init_chunkfile(NULL);
+
+ if (read_table_of_contents(cf, graph->data, graph_size,
+ GRAPH_HEADER_SIZE, graph->num_chunks, 1))
+ goto free_and_return;
+
+ read_chunk(cf, GRAPH_CHUNKID_OIDFANOUT, graph_read_oid_fanout, graph);
+ read_chunk(cf, GRAPH_CHUNKID_OIDLOOKUP, graph_read_oid_lookup, graph);
+ read_chunk(cf, GRAPH_CHUNKID_DATA, graph_read_commit_data, graph);
+ pair_chunk(cf, GRAPH_CHUNKID_EXTRAEDGES, &graph->chunk_extra_edges,
+ &graph->chunk_extra_edges_size);
+ pair_chunk(cf, GRAPH_CHUNKID_BASE, &graph->chunk_base_graphs,
+ &graph->chunk_base_graphs_size);
+
+ if (s->commit_graph_generation_version >= 2) {
+ read_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA,
+ graph_read_generation_data, graph);
+ pair_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA_OVERFLOW,
+ &graph->chunk_generation_data_overflow,
+ &graph->chunk_generation_data_overflow_size);
+
+ if (graph->chunk_generation_data)
+ graph->read_generation_data = 1;
+ }
+
+ if (s->commit_graph_read_changed_paths) {
+ read_chunk(cf, GRAPH_CHUNKID_BLOOMINDEXES,
+ graph_read_bloom_index, graph);
+ read_chunk(cf, GRAPH_CHUNKID_BLOOMDATA,
+ graph_read_bloom_data, graph);
+ }
+
+ if (graph->chunk_bloom_indexes && graph->chunk_bloom_data) {
+ init_bloom_filters();
+ } else {
+ /* We need both the bloom chunks to exist together. Else ignore the data */
+ graph->chunk_bloom_indexes = NULL;
+ graph->chunk_bloom_data = NULL;
+ FREE_AND_NULL(graph->bloom_filter_settings);
+ }
+
+ oidread(&graph->oid, graph->data + graph->data_len - graph->hash_len);
+
+ if (verify_commit_graph_lite(graph))
+ goto free_and_return;
+
+ free_chunkfile(cf);
+ return graph;
+
+free_and_return:
+ free_chunkfile(cf);
+ free(graph->bloom_filter_settings);
+ free(graph);
+ return NULL;
+}
+
+static struct commit_graph *load_commit_graph_one(struct repository *r,
+ 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(r, 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(r, graph_name, odb);
+ free(graph_name);
+
+ return g;
+}
+
+/*
+ * returns 1 if and only if all graphs in the chain have
+ * corrected commit dates stored in the generation_data chunk.
+ */
+static int validate_mixed_generation_chain(struct commit_graph *g)
+{
+ int read_generation_data = 1;
+ struct commit_graph *p = g;
+
+ while (read_generation_data && p) {
+ read_generation_data = p->read_generation_data;
+ p = p->base_graph;
+ }
+
+ if (read_generation_data)
+ return 1;
+
+ while (g) {
+ g->read_generation_data = 0;
+ g = g->base_graph;
+ }
+
+ return 0;
+}
+
+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;
+ }
+
+ if (g->chunk_base_graphs_size / g->hash_len < n) {
+ warning(_("commit-graph base graphs chunk is too small"));
+ return 0;
+ }
+
+ while (n) {
+ n--;
+
+ if (!cur_g ||
+ !oideq(&oids[n], &cur_g->oid) ||
+ !hasheq(oids[n].hash, g->chunk_base_graphs + st_mult(g->hash_len, n))) {
+ warning(_("commit-graph chain does not match"));
+ return 0;
+ }
+
+ cur_g = cur_g->base_graph;
+ }
+
+ if (chain) {
+ if (unsigned_add_overflows(chain->num_commits,
+ chain->num_commits_in_base)) {
+ warning(_("commit count in base graph too high: %"PRIuMAX),
+ (uintmax_t)chain->num_commits_in_base);
+ return 0;
+ }
+ g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
+ }
+
+ g->base_graph = chain;
+
+ return 1;
+}
+
+int open_commit_graph_chain(const char *chain_file,
+ int *fd, struct stat *st)
+{
+ *fd = git_open(chain_file);
+ if (*fd < 0)
+ return 0;
+ if (fstat(*fd, st)) {
+ close(*fd);
+ return 0;
+ }
+ if (st->st_size < the_hash_algo->hexsz) {
+ close(*fd);
+ if (!st->st_size) {
+ /* treat empty files the same as missing */
+ errno = ENOENT;
+ } else {
+ warning("commit-graph chain file too small");
+ errno = EINVAL;
+ }
+ return 0;
+ }
+ return 1;
+}
+
+struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
+ int fd, struct stat *st,
+ int *incomplete_chain)
+{
+ struct commit_graph *graph_chain = NULL;
+ struct strbuf line = STRBUF_INIT;
+ struct object_id *oids;
+ int i = 0, valid = 1, count;
+ FILE *fp = xfdopen(fd, "r");
+
+ count = st->st_size / (the_hash_algo->hexsz + 1);
+ CALLOC_ARRAY(oids, count);
+
+ 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(r, graph_name, odb);
+
+ free(graph_name);
+
+ if (g) {
+ if (add_graph_to_chain(g, graph_chain, oids, i)) {
+ graph_chain = g;
+ valid = 1;
+ } else {
+ free_commit_graph(g);
+ }
+
+ break;
+ }
+ }
+
+ if (!valid) {
+ warning(_("unable to find all commit-graph files"));
+ break;
+ }
+ }
+
+ validate_mixed_generation_chain(graph_chain);
+
+ free(oids);
+ fclose(fp);
+ strbuf_release(&line);
+
+ *incomplete_chain = !valid;
+ return graph_chain;
+}
+
+static struct commit_graph *load_commit_graph_chain(struct repository *r,
+ struct object_directory *odb)
+{
+ char *chain_file = get_commit_graph_chain_filename(odb);
+ struct stat st;
+ int fd;
+ struct commit_graph *g = NULL;
+
+ if (open_commit_graph_chain(chain_file, &fd, &st)) {
+ int incomplete;
+ /* ownership of fd is taken over by load function */
+ g = load_commit_graph_chain_fd_st(r, fd, &st, &incomplete);
+ }
+
+ free(chain_file);
+ return g;
+}
+
+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;
+
+ /*
+ * Early return if there is no git dir or if the commit graph is
+ * disabled.
+ *
+ * This must come before the "already attempted?" check below, because
+ * we want to disable even an already-loaded graph file.
+ */
+ if (!r->gitdir || r->commit_graph_disabled)
+ return 0;
+
+ if (r->objects->commit_graph_attempted)
+ return !!r->objects->commit_graph;
+ r->objects->commit_graph_attempted = 1;
+
+ 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;
+}
+
+int corrected_commit_dates_enabled(struct repository *r)
+{
+ struct commit_graph *g;
+ if (!prepare_commit_graph(r))
+ return 0;
+
+ g = r->objects->commit_graph;
+
+ if (!g->num_commits)
+ return 0;
+
+ return g->read_generation_data;
+}
+
+struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r)
+{
+ struct commit_graph *g = r->objects->commit_graph;
+ while (g) {
+ if (g->bloom_filter_settings)
+ return g->bloom_filter_settings;
+ g = g->base_graph;
+ }
+ return NULL;
+}
+
+void close_commit_graph(struct raw_object_store *o)
+{
+ clear_commit_graph_data_slab(&commit_graph_data_slab);
+ free_commit_graph(o->commit_graph);
+ o->commit_graph = NULL;
+}
+
+static int bsearch_graph(struct commit_graph *g, const 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;
+
+ oidread(oid, g->chunk_oid_lookup + st_mult(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));
+ commit_graph_data_at(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;
+ struct commit_graph_data *graph_data;
+ uint32_t lex_index, offset_pos;
+ uint64_t date_high, date_low, offset;
+
+ 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"));
+
+ lex_index = pos - g->num_commits_in_base;
+ commit_data = g->chunk_commit_data + st_mult(GRAPH_DATA_WIDTH, lex_index);
+
+ graph_data = commit_graph_data_at(item);
+ graph_data->graph_pos = pos;
+
+ 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);
+
+ if (g->read_generation_data) {
+ offset = (timestamp_t)get_be32(g->chunk_generation_data + st_mult(sizeof(uint32_t), lex_index));
+
+ if (offset & CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW) {
+ if (!g->chunk_generation_data_overflow)
+ die(_("commit-graph requires overflow generation data but has none"));
+
+ offset_pos = offset ^ CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW;
+ if (g->chunk_generation_data_overflow_size / sizeof(uint64_t) <= offset_pos)
+ die(_("commit-graph overflow generation data is too small"));
+ graph_data->generation = item->date +
+ get_be64(g->chunk_generation_data_overflow + sizeof(uint64_t) * offset_pos);
+ } else
+ graph_data->generation = item->date + offset;
+ } else
+ graph_data->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
+
+ if (g->topo_levels)
+ *topo_level_slab_at(g->topo_levels, item) = 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_pos;
+ struct commit_list **pptr;
+ const unsigned char *commit_data;
+ uint32_t lex_index;
+
+ while (pos < g->num_commits_in_base)
+ g = g->base_graph;
+
+ fill_commit_graph_info(item, g, pos);
+
+ lex_index = pos - g->num_commits_in_base;
+ commit_data = g->chunk_commit_data + st_mult(g->hash_len + 16, lex_index);
+
+ item->object.parsed = 1;
+
+ set_commit_tree(item, NULL);
+
+ 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_pos = edge_value & GRAPH_EDGE_LAST_MASK;
+ do {
+ if (g->chunk_extra_edges_size / sizeof(uint32_t) <= parent_data_pos) {
+ error("commit-graph extra-edges pointer out of bounds");
+ free_commit_list(item->parents);
+ item->parents = NULL;
+ item->object.parsed = 0;
+ return 0;
+ }
+ edge_value = get_be32(g->chunk_extra_edges +
+ sizeof(uint32_t) * parent_data_pos);
+ pptr = insert_parent_or_die(r, g,
+ edge_value & GRAPH_EDGE_LAST_MASK,
+ pptr);
+ parent_data_pos++;
+ } while (!(edge_value & GRAPH_LAST_EDGE));
+
+ return 1;
+}
+
+static int search_commit_pos_in_graph(const struct object_id *id, struct commit_graph *g, uint32_t *pos)
+{
+ struct commit_graph *cur_g = g;
+ uint32_t lex_index;
+
+ while (cur_g && !bsearch_graph(cur_g, id, &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 find_commit_pos_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
+{
+ uint32_t graph_pos = commit_graph_position(item);
+ if (graph_pos != COMMIT_NOT_FROM_GRAPH) {
+ *pos = graph_pos;
+ return 1;
+ } else {
+ return search_commit_pos_in_graph(&item->object.oid, g, pos);
+ }
+}
+
+int repo_find_commit_pos_in_graph(struct repository *r, struct commit *c,
+ uint32_t *pos)
+{
+ if (!prepare_commit_graph(r))
+ return 0;
+ return find_commit_pos_in_graph(c, r->objects->commit_graph, pos);
+}
+
+struct commit *lookup_commit_in_graph(struct repository *repo, const struct object_id *id)
+{
+ static int commit_graph_paranoia = -1;
+ struct commit *commit;
+ uint32_t pos;
+
+ if (commit_graph_paranoia == -1)
+ commit_graph_paranoia = git_env_bool(GIT_COMMIT_GRAPH_PARANOIA, 1);
+
+ if (!prepare_commit_graph(repo))
+ return NULL;
+ if (!search_commit_pos_in_graph(id, repo->objects->commit_graph, &pos))
+ return NULL;
+ if (commit_graph_paranoia && !has_object(repo, id, 0))
+ return NULL;
+
+ commit = lookup_commit(repo, id);
+ if (!commit)
+ return NULL;
+ if (commit->object.parsed)
+ return commit;
+
+ if (!fill_commit_in_graph(repo, commit, repo->objects->commit_graph, pos))
+ return NULL;
+
+ return commit;
+}
+
+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_pos_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)
+{
+ static int checked_env = 0;
+
+ if (!checked_env &&
+ git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE, 0))
+ die("dying as requested by the '%s' variable on commit-graph parse!",
+ GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE);
+ checked_env = 1;
+
+ 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 (repo_find_commit_pos_in_graph(r, item, &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;
+ uint32_t graph_pos = commit_graph_position(c);
+
+ while (graph_pos < g->num_commits_in_base)
+ g = g->base_graph;
+
+ commit_data = g->chunk_commit_data +
+ st_mult(GRAPH_DATA_WIDTH, graph_pos - g->num_commits_in_base);
+
+ oidread(&oid, 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 (commit_graph_position(c) == 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;
+ size_t nr;
+ size_t alloc;
+};
+
+struct write_commit_graph_context {
+ struct repository *r;
+ struct object_directory *odb;
+ char *graph_name;
+ struct oid_array oids;
+ struct packed_commit_list commits;
+ int num_extra_edges;
+ int num_generation_data_overflows;
+ 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,
+ changed_paths:1,
+ order_by_pack:1,
+ write_generation_data:1,
+ trust_generation_numbers:1;
+
+ struct topo_level_slab *topo_levels;
+ const struct commit_graph_opts *opts;
+ size_t total_bloom_filter_data_size;
+ const struct bloom_filter_settings *bloom_settings;
+
+ int count_bloom_filter_computed;
+ int count_bloom_filter_not_computed;
+ int count_bloom_filter_trunc_empty;
+ int count_bloom_filter_trunc_large;
+};
+
+static int write_graph_chunk_fanout(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ 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);
+ }
+
+ return 0;
+}
+
+static int write_graph_chunk_oids(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ 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, the_hash_algo->rawsz);
+ }
+
+ return 0;
+}
+
+static const struct object_id *commit_to_oid(size_t index, const void *table)
+{
+ const struct commit * const *commits = table;
+ return &commits[index]->object.oid;
+}
+
+static int write_graph_chunk_data(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ 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 (repo_parse_commit_no_graph(ctx->r, *list))
+ die(_("unable to parse commit %s"),
+ oid_to_hex(&(*list)->object.oid));
+ tree = get_commit_tree_oid(*list);
+ hashwrite(f, tree->hash, the_hash_algo->rawsz);
+
+ parent = (*list)->parents;
+
+ if (!parent)
+ edge_value = GRAPH_PARENT_NONE;
+ else {
+ edge_value = oid_pos(&parent->item->object.oid,
+ ctx->commits.list,
+ ctx->commits.nr,
+ commit_to_oid);
+
+ if (edge_value >= 0)
+ edge_value += ctx->new_num_commits_in_base;
+ else if (ctx->new_base_graph) {
+ uint32_t pos;
+ if (find_commit_pos_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 = oid_pos(&parent->item->object.oid,
+ ctx->commits.list,
+ ctx->commits.nr,
+ commit_to_oid);
+
+ if (edge_value >= 0)
+ edge_value += ctx->new_num_commits_in_base;
+ else if (ctx->new_base_graph) {
+ uint32_t pos;
+ if (find_commit_pos_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(*topo_level_slab_at(ctx->topo_levels, *list) << 2);
+
+ packedDate[1] = htonl((*list)->date);
+ hashwrite(f, packedDate, 8);
+
+ list++;
+ }
+
+ return 0;
+}
+
+static int write_graph_chunk_generation_data(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ int i, num_generation_data_overflows = 0;
+
+ for (i = 0; i < ctx->commits.nr; i++) {
+ struct commit *c = ctx->commits.list[i];
+ timestamp_t offset;
+ repo_parse_commit(ctx->r, c);
+ offset = commit_graph_data_at(c)->generation - c->date;
+ display_progress(ctx->progress, ++ctx->progress_cnt);
+
+ if (offset > GENERATION_NUMBER_V2_OFFSET_MAX) {
+ offset = CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW | num_generation_data_overflows;
+ num_generation_data_overflows++;
+ }
+
+ hashwrite_be32(f, offset);
+ }
+
+ return 0;
+}
+
+static int write_graph_chunk_generation_data_overflow(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ int i;
+ for (i = 0; i < ctx->commits.nr; i++) {
+ struct commit *c = ctx->commits.list[i];
+ timestamp_t offset = commit_graph_data_at(c)->generation - c->date;
+ display_progress(ctx->progress, ++ctx->progress_cnt);
+
+ if (offset > GENERATION_NUMBER_V2_OFFSET_MAX) {
+ hashwrite_be32(f, offset >> 32);
+ hashwrite_be32(f, (uint32_t) offset);
+ }
+ }
+
+ return 0;
+}
+
+static int write_graph_chunk_extra_edges(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ 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 = oid_pos(&parent->item->object.oid,
+ ctx->commits.list,
+ ctx->commits.nr,
+ commit_to_oid);
+
+ if (edge_value >= 0)
+ edge_value += ctx->new_num_commits_in_base;
+ else if (ctx->new_base_graph) {
+ uint32_t pos;
+ if (find_commit_pos_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++;
+ }
+
+ return 0;
+}
+
+static int write_graph_chunk_bloom_indexes(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ struct commit **list = ctx->commits.list;
+ struct commit **last = ctx->commits.list + ctx->commits.nr;
+ uint32_t cur_pos = 0;
+
+ while (list < last) {
+ struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
+ size_t len = filter ? filter->len : 0;
+ cur_pos += len;
+ display_progress(ctx->progress, ++ctx->progress_cnt);
+ hashwrite_be32(f, cur_pos);
+ list++;
+ }
+
+ return 0;
+}
+
+static void trace2_bloom_filter_settings(struct write_commit_graph_context *ctx)
+{
+ struct json_writer jw = JSON_WRITER_INIT;
+
+ jw_object_begin(&jw, 0);
+ jw_object_intmax(&jw, "hash_version", ctx->bloom_settings->hash_version);
+ jw_object_intmax(&jw, "num_hashes", ctx->bloom_settings->num_hashes);
+ jw_object_intmax(&jw, "bits_per_entry", ctx->bloom_settings->bits_per_entry);
+ jw_object_intmax(&jw, "max_changed_paths", ctx->bloom_settings->max_changed_paths);
+ jw_end(&jw);
+
+ trace2_data_json("bloom", ctx->r, "settings", &jw);
+
+ jw_release(&jw);
+}
+
+static int write_graph_chunk_bloom_data(struct hashfile *f,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ struct commit **list = ctx->commits.list;
+ struct commit **last = ctx->commits.list + ctx->commits.nr;
+
+ trace2_bloom_filter_settings(ctx);
+
+ hashwrite_be32(f, ctx->bloom_settings->hash_version);
+ hashwrite_be32(f, ctx->bloom_settings->num_hashes);
+ hashwrite_be32(f, ctx->bloom_settings->bits_per_entry);
+
+ while (list < last) {
+ struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
+ size_t len = filter ? filter->len : 0;
+
+ display_progress(ctx->progress, ++ctx->progress_cnt);
+ if (len)
+ hashwrite(f, filter->data, len * sizeof(unsigned char));
+ list++;
+ }
+
+ return 0;
+}
+
+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;
+
+ oid_array_append(&ctx->oids, oid);
+ set_commit_pos(ctx->r, oid);
+
+ 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)) {
+ oid_array_append(&ctx->oids, &parent->item->object.oid);
+ parent->item->object.flags |= REACHABLE;
+ }
+ }
+}
+
+static void close_reachable(struct write_commit_graph_context *ctx)
+{
+ int i;
+ struct commit *commit;
+ enum commit_graph_split_flags flags = ctx->opts ?
+ ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
+
+ 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.oid[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.oid[i]);
+
+ if (!commit)
+ continue;
+ if (ctx->split) {
+ if ((!repo_parse_commit(ctx->r, commit) &&
+ commit_graph_position(commit) == COMMIT_NOT_FROM_GRAPH) ||
+ flags == COMMIT_GRAPH_SPLIT_REPLACE)
+ add_missing_parents(ctx, commit);
+ } else if (!repo_parse_commit_no_graph(ctx->r, 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.oid[i]);
+
+ if (commit)
+ commit->object.flags &= ~REACHABLE;
+ }
+ stop_progress(&ctx->progress);
+}
+
+struct compute_generation_info {
+ struct repository *r;
+ struct packed_commit_list *commits;
+ struct progress *progress;
+ int progress_cnt;
+
+ timestamp_t (*get_generation)(struct commit *c, void *data);
+ void (*set_generation)(struct commit *c, timestamp_t gen, void *data);
+ void *data;
+};
+
+static timestamp_t compute_generation_from_max(struct commit *c,
+ timestamp_t max_gen,
+ int generation_version)
+{
+ switch (generation_version) {
+ case 1: /* topological levels */
+ if (max_gen > GENERATION_NUMBER_V1_MAX - 1)
+ max_gen = GENERATION_NUMBER_V1_MAX - 1;
+ return max_gen + 1;
+
+ case 2: /* corrected commit date */
+ if (c->date && c->date > max_gen)
+ max_gen = c->date - 1;
+ return max_gen + 1;
+
+ default:
+ BUG("attempting unimplemented version");
+ }
+}
+
+static void compute_reachable_generation_numbers(
+ struct compute_generation_info *info,
+ int generation_version)
+{
+ int i;
+ struct commit_list *list = NULL;
+
+ for (i = 0; i < info->commits->nr; i++) {
+ struct commit *c = info->commits->list[i];
+ timestamp_t gen;
+ repo_parse_commit(info->r, c);
+ gen = info->get_generation(c, info->data);
+ display_progress(info->progress, info->progress_cnt + 1);
+
+ if (gen != GENERATION_NUMBER_ZERO && gen != GENERATION_NUMBER_INFINITY)
+ continue;
+
+ commit_list_insert(c, &list);
+ while (list) {
+ struct commit *current = list->item;
+ struct commit_list *parent;
+ int all_parents_computed = 1;
+ uint32_t max_gen = 0;
+
+ for (parent = current->parents; parent; parent = parent->next) {
+ repo_parse_commit(info->r, parent->item);
+ gen = info->get_generation(parent->item, info->data);
+
+ if (gen == GENERATION_NUMBER_ZERO) {
+ all_parents_computed = 0;
+ commit_list_insert(parent->item, &list);
+ break;
+ }
+
+ if (gen > max_gen)
+ max_gen = gen;
+ }
+
+ if (all_parents_computed) {
+ pop_commit(&list);
+ gen = compute_generation_from_max(
+ current, max_gen,
+ generation_version);
+ info->set_generation(current, gen, info->data);
+ }
+ }
+ }
+}
+
+static timestamp_t get_topo_level(struct commit *c, void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ return *topo_level_slab_at(ctx->topo_levels, c);
+}
+
+static void set_topo_level(struct commit *c, timestamp_t t, void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ *topo_level_slab_at(ctx->topo_levels, c) = (uint32_t)t;
+}
+
+static void compute_topological_levels(struct write_commit_graph_context *ctx)
+{
+ struct compute_generation_info info = {
+ .r = ctx->r,
+ .commits = &ctx->commits,
+ .get_generation = get_topo_level,
+ .set_generation = set_topo_level,
+ .data = ctx,
+ };
+
+ if (ctx->report_progress)
+ info.progress = ctx->progress
+ = start_delayed_progress(
+ _("Computing commit graph topological levels"),
+ ctx->commits.nr);
+
+ compute_reachable_generation_numbers(&info, 1);
+
+ stop_progress(&ctx->progress);
+}
+
+static timestamp_t get_generation_from_graph_data(struct commit *c,
+ void *data UNUSED)
+{
+ return commit_graph_data_at(c)->generation;
+}
+
+static void set_generation_v2(struct commit *c, timestamp_t t,
+ void *data UNUSED)
+{
+ struct commit_graph_data *g = commit_graph_data_at(c);
+ g->generation = t;
+}
+
+static void compute_generation_numbers(struct write_commit_graph_context *ctx)
+{
+ int i;
+ struct compute_generation_info info = {
+ .r = ctx->r,
+ .commits = &ctx->commits,
+ .get_generation = get_generation_from_graph_data,
+ .set_generation = set_generation_v2,
+ };
+
+ if (ctx->report_progress)
+ info.progress = ctx->progress
+ = start_delayed_progress(
+ _("Computing commit graph generation numbers"),
+ ctx->commits.nr);
+
+ if (!ctx->trust_generation_numbers) {
+ for (i = 0; i < ctx->commits.nr; i++) {
+ struct commit *c = ctx->commits.list[i];
+ repo_parse_commit(ctx->r, c);
+ commit_graph_data_at(c)->generation = GENERATION_NUMBER_ZERO;
+ }
+ }
+
+ compute_reachable_generation_numbers(&info, 2);
+
+ for (i = 0; i < ctx->commits.nr; i++) {
+ struct commit *c = ctx->commits.list[i];
+ timestamp_t offset = commit_graph_data_at(c)->generation - c->date;
+ if (offset > GENERATION_NUMBER_V2_OFFSET_MAX)
+ ctx->num_generation_data_overflows++;
+ }
+ stop_progress(&ctx->progress);
+}
+
+static void set_generation_in_graph_data(struct commit *c, timestamp_t t,
+ void *data UNUSED)
+{
+ commit_graph_data_at(c)->generation = t;
+}
+
+/*
+ * After this method, all commits reachable from those in the given
+ * list will have non-zero, non-infinite generation numbers.
+ */
+void ensure_generations_valid(struct repository *r,
+ struct commit **commits, size_t nr)
+{
+ int generation_version = get_configured_generation_version(r);
+ struct packed_commit_list list = {
+ .list = commits,
+ .alloc = nr,
+ .nr = nr,
+ };
+ struct compute_generation_info info = {
+ .r = r,
+ .commits = &list,
+ .get_generation = get_generation_from_graph_data,
+ .set_generation = set_generation_in_graph_data,
+ };
+
+ compute_reachable_generation_numbers(&info, generation_version);
+}
+
+static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
+{
+ trace2_data_intmax("commit-graph", ctx->r, "filter-computed",
+ ctx->count_bloom_filter_computed);
+ trace2_data_intmax("commit-graph", ctx->r, "filter-not-computed",
+ ctx->count_bloom_filter_not_computed);
+ trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-empty",
+ ctx->count_bloom_filter_trunc_empty);
+ trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large",
+ ctx->count_bloom_filter_trunc_large);
+}
+
+static void compute_bloom_filters(struct write_commit_graph_context *ctx)
+{
+ int i;
+ struct progress *progress = NULL;
+ struct commit **sorted_commits;
+ int max_new_filters;
+
+ init_bloom_filters();
+
+ if (ctx->report_progress)
+ progress = start_delayed_progress(
+ _("Computing commit changed paths Bloom filters"),
+ ctx->commits.nr);
+
+ DUP_ARRAY(sorted_commits, ctx->commits.list, ctx->commits.nr);
+
+ if (ctx->order_by_pack)
+ QSORT(sorted_commits, ctx->commits.nr, commit_pos_cmp);
+ else
+ QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
+
+ max_new_filters = ctx->opts && ctx->opts->max_new_filters >= 0 ?
+ ctx->opts->max_new_filters : ctx->commits.nr;
+
+ for (i = 0; i < ctx->commits.nr; i++) {
+ enum bloom_filter_computed computed = 0;
+ struct commit *c = sorted_commits[i];
+ struct bloom_filter *filter = get_or_compute_bloom_filter(
+ ctx->r,
+ c,
+ ctx->count_bloom_filter_computed < max_new_filters,
+ ctx->bloom_settings,
+ &computed);
+ if (computed & BLOOM_COMPUTED) {
+ ctx->count_bloom_filter_computed++;
+ if (computed & BLOOM_TRUNC_EMPTY)
+ ctx->count_bloom_filter_trunc_empty++;
+ if (computed & BLOOM_TRUNC_LARGE)
+ ctx->count_bloom_filter_trunc_large++;
+ } else if (computed & BLOOM_NOT_COMPUTED)
+ ctx->count_bloom_filter_not_computed++;
+ ctx->total_bloom_filter_data_size += filter
+ ? sizeof(unsigned char) * filter->len : 0;
+ display_progress(progress, i + 1);
+ }
+
+ if (trace2_is_enabled())
+ trace2_bloom_filter_write_statistics(ctx);
+
+ free(sorted_commits);
+ stop_progress(&progress);
+}
+
+struct refs_cb_data {
+ struct oidset *commits;
+ struct progress *progress;
+};
+
+static int add_ref_to_set(const char *refname UNUSED,
+ const struct object_id *oid,
+ int flags UNUSED, void *cb_data)
+{
+ struct object_id peeled;
+ struct refs_cb_data *data = (struct refs_cb_data *)cb_data;
+
+ if (!peel_iterated_oid(oid, &peeled))
+ oid = &peeled;
+ if (oid_object_info(the_repository, oid, NULL) == OBJ_COMMIT)
+ oidset_insert(data->commits, oid);
+
+ display_progress(data->progress, oidset_size(data->commits));
+
+ return 0;
+}
+
+int write_commit_graph_reachable(struct object_directory *odb,
+ enum commit_graph_write_flags flags,
+ const struct commit_graph_opts *opts)
+{
+ struct oidset commits = OIDSET_INIT;
+ struct refs_cb_data data;
+ int result;
+
+ memset(&data, 0, sizeof(data));
+ data.commits = &commits;
+ if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
+ data.progress = start_delayed_progress(
+ _("Collecting referenced commits"), 0);
+
+ for_each_ref(add_ref_to_set, &data);
+
+ stop_progress(&data.progress);
+
+ result = write_commit_graph(odb, NULL, &commits,
+ flags, opts);
+
+ oidset_clear(&commits);
+ return result;
+}
+
+static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
+ const struct string_list *pack_indexes)
+{
+ uint32_t i;
+ struct strbuf progress_title = STRBUF_INIT;
+ struct strbuf packname = STRBUF_INIT;
+ int dirlen;
+ int ret = 0;
+
+ 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 %"PRIuMAX" pack",
+ "Finding commits for commit graph in %"PRIuMAX" packs",
+ pack_indexes->nr),
+ (uintmax_t)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) {
+ ret = error(_("error adding pack %s"), packname.buf);
+ goto cleanup;
+ }
+ if (open_pack_index(p)) {
+ ret = error(_("error opening index for %s"), packname.buf);
+ goto cleanup;
+ }
+ for_each_object_in_pack(p, add_packed_commits, ctx,
+ FOR_EACH_OBJECT_PACK_ORDER);
+ close_pack(p);
+ free(p);
+ }
+
+cleanup:
+ stop_progress(&ctx->progress);
+ strbuf_release(&progress_title);
+ strbuf_release(&packname);
+
+ return ret;
+}
+
+static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
+ struct oidset *commits)
+{
+ struct oidset_iter iter;
+ struct object_id *oid;
+
+ if (!oidset_size(commits))
+ return 0;
+
+ oidset_iter_init(commits, &iter);
+ while ((oid = oidset_iter_next(&iter))) {
+ oid_array_append(&ctx->oids, oid);
+ }
+
+ 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 void copy_oids_to_commits(struct write_commit_graph_context *ctx)
+{
+ uint32_t i;
+ enum commit_graph_split_flags flags = ctx->opts ?
+ ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
+
+ ctx->num_extra_edges = 0;
+ if (ctx->report_progress)
+ ctx->progress = start_delayed_progress(
+ _("Finding extra edges in commit graph"),
+ ctx->oids.nr);
+ oid_array_sort(&ctx->oids);
+ for (i = 0; i < ctx->oids.nr; i = oid_array_next_unique(&ctx->oids, i)) {
+ unsigned int num_parents;
+
+ display_progress(ctx->progress, i + 1);
+
+ ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
+ ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.oid[i]);
+
+ if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
+ commit_graph_position(ctx->commits.list[ctx->commits.nr]) != COMMIT_NOT_FROM_GRAPH)
+ continue;
+
+ if (ctx->split && flags == COMMIT_GRAPH_SPLIT_REPLACE)
+ repo_parse_commit(ctx->r, ctx->commits.list[ctx->commits.nr]);
+ else
+ repo_parse_commit_no_graph(ctx->r, 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,
+ void *data)
+{
+ struct write_commit_graph_context *ctx = data;
+ 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;
+ const unsigned hashsz = the_hash_algo->rawsz;
+ struct strbuf progress_title = STRBUF_INIT;
+ struct chunkfile *cf;
+ unsigned char file_hash[GIT_MAX_RAWSZ];
+
+ 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_commit_graph_chain_filename(ctx->odb);
+
+ hold_lock_file_for_update_mode(&lk, lock_name,
+ LOCK_DIE_ON_ERROR, 0444);
+ free(lock_name);
+
+ fd = git_mkstemp_mode(ctx->graph_name, 0444);
+ if (fd < 0) {
+ error(_("unable to create temporary graph layer"));
+ return -1;
+ }
+
+ if (adjust_shared_perm(ctx->graph_name)) {
+ error(_("unable to adjust shared permissions for '%s'"),
+ ctx->graph_name);
+ return -1;
+ }
+
+ f = hashfd(fd, ctx->graph_name);
+ } else {
+ hold_lock_file_for_update_mode(&lk, ctx->graph_name,
+ LOCK_DIE_ON_ERROR, 0444);
+ fd = get_lock_file_fd(&lk);
+ f = hashfd(fd, get_lock_file_path(&lk));
+ }
+
+ cf = init_chunkfile(f);
+
+ add_chunk(cf, GRAPH_CHUNKID_OIDFANOUT, GRAPH_FANOUT_SIZE,
+ write_graph_chunk_fanout);
+ add_chunk(cf, GRAPH_CHUNKID_OIDLOOKUP, st_mult(hashsz, ctx->commits.nr),
+ write_graph_chunk_oids);
+ add_chunk(cf, GRAPH_CHUNKID_DATA, st_mult(hashsz + 16, ctx->commits.nr),
+ write_graph_chunk_data);
+
+ if (ctx->write_generation_data)
+ add_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA,
+ st_mult(sizeof(uint32_t), ctx->commits.nr),
+ write_graph_chunk_generation_data);
+ if (ctx->num_generation_data_overflows)
+ add_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA_OVERFLOW,
+ st_mult(sizeof(timestamp_t), ctx->num_generation_data_overflows),
+ write_graph_chunk_generation_data_overflow);
+ if (ctx->num_extra_edges)
+ add_chunk(cf, GRAPH_CHUNKID_EXTRAEDGES,
+ st_mult(4, ctx->num_extra_edges),
+ write_graph_chunk_extra_edges);
+ if (ctx->changed_paths) {
+ add_chunk(cf, GRAPH_CHUNKID_BLOOMINDEXES,
+ st_mult(sizeof(uint32_t), ctx->commits.nr),
+ write_graph_chunk_bloom_indexes);
+ add_chunk(cf, GRAPH_CHUNKID_BLOOMDATA,
+ st_add(sizeof(uint32_t) * 3,
+ ctx->total_bloom_filter_data_size),
+ write_graph_chunk_bloom_data);
+ }
+ if (ctx->num_commit_graphs_after > 1)
+ add_chunk(cf, GRAPH_CHUNKID_BASE,
+ st_mult(hashsz, ctx->num_commit_graphs_after - 1),
+ write_graph_chunk_base);
+
+ hashwrite_be32(f, GRAPH_SIGNATURE);
+
+ hashwrite_u8(f, GRAPH_VERSION);
+ hashwrite_u8(f, oid_version(the_hash_algo));
+ hashwrite_u8(f, get_num_chunks(cf));
+ hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
+
+ if (ctx->report_progress) {
+ strbuf_addf(&progress_title,
+ Q_("Writing out commit graph in %d pass",
+ "Writing out commit graph in %d passes",
+ get_num_chunks(cf)),
+ get_num_chunks(cf));
+ ctx->progress = start_delayed_progress(
+ progress_title.buf,
+ st_mult(get_num_chunks(cf), ctx->commits.nr));
+ }
+
+ write_chunkfile(cf, ctx);
+
+ 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, FSYNC_COMPONENT_COMMIT_GRAPH,
+ CSUM_HASH_IN_STREAM | CSUM_FSYNC);
+ free_chunkfile(cf);
+
+ 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;
+ int idx = ctx->num_commit_graphs_after - 1;
+ if (ctx->num_commit_graphs_after > 1)
+ idx--;
+
+ dest = ctx->commit_graph_filenames_after[idx];
+
+ 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);
+ free(graph_name);
+ }
+
+ free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
+ ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(hash_to_hex(file_hash));
+ final_graph_name = get_split_graph_filename(ctx->odb,
+ ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
+ free(ctx->commit_graph_filenames_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(get_lock_file_fp(&lk), "%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;
+ enum commit_graph_split_flags flags = COMMIT_GRAPH_SPLIT_UNSPECIFIED;
+ uint32_t i;
+
+ int max_commits = 0;
+ int size_mult = 2;
+
+ if (ctx->opts) {
+ max_commits = ctx->opts->max_commits;
+
+ if (ctx->opts->size_multiple)
+ size_mult = ctx->opts->size_multiple;
+
+ flags = ctx->opts->split_flags;
+ }
+
+ g = ctx->r->objects->commit_graph;
+ num_commits = ctx->commits.nr;
+ if (flags == COMMIT_GRAPH_SPLIT_REPLACE)
+ ctx->num_commit_graphs_after = 1;
+ else
+ ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
+
+ if (flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED &&
+ flags != COMMIT_GRAPH_SPLIT_REPLACE) {
+ while (g && (g->num_commits <= st_mult(size_mult, num_commits) ||
+ (max_commits && num_commits > max_commits))) {
+ if (g->odb != ctx->odb)
+ break;
+
+ if (unsigned_add_overflows(num_commits, g->num_commits))
+ die(_("cannot merge graphs with %"PRIuMAX", "
+ "%"PRIuMAX" commits"),
+ (uintmax_t)num_commits,
+ (uintmax_t)g->num_commits);
+ num_commits += g->num_commits;
+ g = g->base_graph;
+
+ ctx->num_commit_graphs_after--;
+ }
+ }
+
+ if (flags != COMMIT_GRAPH_SPLIT_REPLACE)
+ ctx->new_base_graph = g;
+ else if (ctx->num_commit_graphs_after != 1)
+ BUG("split_graph_merge_strategy: num_commit_graphs_after "
+ "should be 1 with --split=replace");
+
+ 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);
+ }
+
+ CALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
+ CALLOC_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));
+
+ /*
+ * If the topmost remaining layer has generation data chunk, the
+ * resultant layer also has generation data chunk.
+ */
+ if (i == ctx->num_commit_graphs_after - 2)
+ ctx->write_generation_data = !!g->chunk_generation_data;
+
+ 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;
+
+ if (unsigned_add_overflows(ctx->commits.nr, g->num_commits))
+ die(_("cannot merge graph %s, too many commits: %"PRIuMAX),
+ oid_to_hex(&g->oid),
+ (uintmax_t)st_add(ctx->commits.nr, g->num_commits));
+
+ 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, dedup_i = 0;
+
+ 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 + 1);
+
+ if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
+ &ctx->commits.list[i]->object.oid)) {
+ /*
+ * Silently ignore duplicates. These were likely
+ * created due to a commit appearing in multiple
+ * layers of the chain, which is unexpected but
+ * not invalid. We should make sure there is a
+ * unique copy in the new layer.
+ */
+ } else {
+ unsigned int num_parents;
+
+ ctx->commits.list[dedup_i] = ctx->commits.list[i];
+ dedup_i++;
+
+ num_parents = commit_list_count(ctx->commits.list[i]->parents);
+ if (num_parents > 2)
+ ctx->num_extra_edges += num_parents - 1;
+ }
+ }
+
+ ctx->commits.nr = dedup_i;
+
+ 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;
+
+ if (stat(ctx->commit_graph_filenames_before[i], &st) < 0)
+ continue;
+
+ 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->opts && ctx->opts->expire_time)
+ expire_time = ctx->opts->expire_time;
+ if (!ctx->split) {
+ char *chain_file_name = get_commit_graph_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);
+
+ if (stat(path.buf, &st) < 0)
+ continue;
+
+ 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:
+ if(dir)
+ closedir(dir);
+ strbuf_release(&path);
+}
+
+int write_commit_graph(struct object_directory *odb,
+ const struct string_list *const pack_indexes,
+ struct oidset *commits,
+ enum commit_graph_write_flags flags,
+ const struct commit_graph_opts *opts)
+{
+ struct repository *r = the_repository;
+ struct write_commit_graph_context *ctx;
+ uint32_t i;
+ int res = 0;
+ int replace = 0;
+ struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
+ struct topo_level_slab topo_levels;
+
+ prepare_repo_settings(r);
+ if (!r->settings.core_commit_graph) {
+ warning(_("attempting to write a commit-graph, but 'core.commitGraph' is disabled"));
+ return 0;
+ }
+ if (!commit_graph_compatible(r))
+ return 0;
+
+ CALLOC_ARRAY(ctx, 1);
+ ctx->r = r;
+ 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->opts = opts;
+ ctx->total_bloom_filter_data_size = 0;
+ ctx->write_generation_data = (get_configured_generation_version(r) == 2);
+ ctx->num_generation_data_overflows = 0;
+
+ bloom_settings.bits_per_entry = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY",
+ bloom_settings.bits_per_entry);
+ bloom_settings.num_hashes = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_NUM_HASHES",
+ bloom_settings.num_hashes);
+ bloom_settings.max_changed_paths = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS",
+ bloom_settings.max_changed_paths);
+ ctx->bloom_settings = &bloom_settings;
+
+ init_topo_level_slab(&topo_levels);
+ ctx->topo_levels = &topo_levels;
+
+ prepare_commit_graph(ctx->r);
+ if (ctx->r->objects->commit_graph) {
+ struct commit_graph *g = ctx->r->objects->commit_graph;
+
+ while (g) {
+ g->topo_levels = &topo_levels;
+ g = g->base_graph;
+ }
+ }
+
+ if (flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS)
+ ctx->changed_paths = 1;
+ if (!(flags & COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS)) {
+ struct commit_graph *g;
+
+ g = ctx->r->objects->commit_graph;
+
+ /* We have changed-paths already. Keep them in the next graph */
+ if (g && g->chunk_bloom_data) {
+ ctx->changed_paths = 1;
+ ctx->bloom_settings = g->bloom_filter_settings;
+ }
+ }
+
+ if (ctx->split) {
+ struct commit_graph *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;
+ }
+ }
+
+ if (ctx->opts)
+ replace = ctx->opts->split_flags & COMMIT_GRAPH_SPLIT_REPLACE;
+ }
+
+ ctx->approx_nr_objects = repo_approximate_object_count(the_repository);
+
+ 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++) {
+ struct object_id oid;
+ oidread(&oid, g->chunk_oid_lookup + st_mult(g->hash_len, i));
+ oid_array_append(&ctx->oids, &oid);
+ }
+ }
+
+ if (pack_indexes) {
+ ctx->order_by_pack = 1;
+ if ((res = fill_oids_from_packs(ctx, pack_indexes)))
+ goto cleanup;
+ }
+
+ if (commits) {
+ if ((res = fill_oids_from_commits(ctx, commits)))
+ goto cleanup;
+ }
+
+ if (!pack_indexes && !commits) {
+ ctx->order_by_pack = 1;
+ fill_oids_from_all_packs(ctx);
+ }
+
+ close_reachable(ctx);
+
+ 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 && !replace)
+ goto cleanup;
+
+ if (ctx->split) {
+ split_graph_merge_strategy(ctx);
+
+ if (!replace)
+ merge_commit_graphs(ctx);
+ } else
+ ctx->num_commit_graphs_after = 1;
+
+ ctx->trust_generation_numbers = validate_mixed_generation_chain(ctx->r->objects->commit_graph);
+
+ compute_topological_levels(ctx);
+ if (ctx->write_generation_data)
+ compute_generation_numbers(ctx);
+
+ if (ctx->changed_paths)
+ compute_bloom_filters(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->base_graph_name);
+ free(ctx->commits.list);
+ oid_array_clear(&ctx->oids);
+ clear_topo_level_slab(&topo_levels);
+
+ 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;
+
+__attribute__((format (printf, 1, 2)))
+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);
+}
+
+static int commit_graph_checksum_valid(struct commit_graph *g)
+{
+ return hashfile_checksum_valid(g->data, g->data_len);
+}
+
+static int verify_one_commit_graph(struct repository *r,
+ struct commit_graph *g,
+ struct progress *progress,
+ uint64_t *seen)
+{
+ uint32_t i, cur_fanout_pos = 0;
+ struct object_id prev_oid, cur_oid;
+ struct commit *seen_gen_zero = NULL;
+ struct commit *seen_gen_non_zero = NULL;
+
+ verify_commit_graph_error = verify_commit_graph_lite(g);
+ if (verify_commit_graph_error)
+ return verify_commit_graph_error;
+
+ if (!commit_graph_checksum_valid(g)) {
+ 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;
+
+ oidread(&cur_oid, g->chunk_oid_lookup + st_mult(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;
+
+ for (i = 0; i < g->num_commits; i++) {
+ struct commit *graph_commit, *odb_commit;
+ struct commit_list *graph_parents, *odb_parents;
+ timestamp_t max_generation = 0;
+ timestamp_t generation;
+
+ display_progress(progress, ++(*seen));
+ oidread(&cur_oid, g->chunk_oid_lookup + st_mult(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 (repo_parse_commit_internal(r, 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) {
+ 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));
+
+ generation = commit_graph_generation_from_graph(graph_parents->item);
+ if (generation > max_generation)
+ max_generation = generation;
+
+ graph_parents = graph_parents->next;
+ odb_parents = odb_parents->next;
+ }
+
+ if (odb_parents)
+ graph_report(_("commit-graph parent list for commit %s terminates early"),
+ oid_to_hex(&cur_oid));
+
+ if (commit_graph_generation_from_graph(graph_commit))
+ seen_gen_non_zero = graph_commit;
+ else
+ seen_gen_zero = graph_commit;
+
+ if (seen_gen_zero)
+ continue;
+
+ /*
+ * If we are using topological level and one of our parents has
+ * generation GENERATION_NUMBER_V1_MAX, then our generation is
+ * also GENERATION_NUMBER_V1_MAX. Decrement to avoid extra logic
+ * in the following condition.
+ */
+ if (!g->read_generation_data && max_generation == GENERATION_NUMBER_V1_MAX)
+ max_generation--;
+
+ generation = commit_graph_generation(graph_commit);
+ if (generation < max_generation + 1)
+ graph_report(_("commit-graph generation for commit %s is %"PRItime" < %"PRItime),
+ oid_to_hex(&cur_oid),
+ 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);
+ }
+
+ if (seen_gen_zero && seen_gen_non_zero)
+ graph_report(_("commit-graph has both zero and non-zero "
+ "generations (e.g., commits '%s' and '%s')"),
+ oid_to_hex(&seen_gen_zero->object.oid),
+ oid_to_hex(&seen_gen_non_zero->object.oid));
+
+ return verify_commit_graph_error;
+}
+
+int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
+{
+ struct progress *progress = NULL;
+ int local_error = 0;
+ uint64_t seen = 0;
+
+ if (!g) {
+ graph_report("no commit-graph file loaded");
+ return 1;
+ }
+
+ if (flags & COMMIT_GRAPH_WRITE_PROGRESS) {
+ uint64_t total = g->num_commits;
+ if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW))
+ total += g->num_commits_in_base;
+
+ progress = start_progress(_("Verifying commits in commit graph"),
+ total);
+ }
+
+ for (; g; g = g->base_graph) {
+ local_error |= verify_one_commit_graph(r, g, progress, &seen);
+ if (flags & COMMIT_GRAPH_VERIFY_SHALLOW)
+ break;
+ }
+
+ stop_progress(&progress);
+
+ return local_error;
+}
+
+void free_commit_graph(struct commit_graph *g)
+{
+ while (g) {
+ struct commit_graph *next = g->base_graph;
+
+ if (g->data)
+ munmap((void *)g->data, g->data_len);
+ free(g->filename);
+ free(g->bloom_filter_settings);
+ free(g);
+
+ g = next;
+ }
+}
+
+void disable_commit_graph(struct repository *r)
+{
+ r->commit_graph_disabled = 1;
+}