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#include "git-compat-util.h"
#include "config.h"
#include "csum-file.h"
#include "gettext.h"
#include "hex.h"
#include "lockfile.h"
#include "packfile.h"
#include "commit.h"
#include "object.h"
#include "refs.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 graph_read_oid_fanout(const unsigned char *chunk_start,
size_t chunk_size, void *data)
{
struct commit_graph *g = data;
int i;
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;
g->num_commits = ntohl(g->chunk_oid_fanout[255]);
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;
}
}
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;
if (chunk_size / g->hash_len != g->num_commits)
return error(_("commit-graph OID lookup chunk is the wrong size"));
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 / GRAPH_DATA_WIDTH != g->num_commits)
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 / sizeof(uint32_t) != g->num_commits)
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 / 4 != g->num_commits) {
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;
if (read_chunk(cf, GRAPH_CHUNKID_OIDFANOUT, graph_read_oid_fanout, graph)) {
error(_("commit-graph required OID fanout chunk missing or corrupted"));
goto free_and_return;
}
if (read_chunk(cf, GRAPH_CHUNKID_OIDLOOKUP, graph_read_oid_lookup, graph)) {
error(_("commit-graph required OID lookup chunk missing or corrupted"));
goto free_and_return;
}
if (read_chunk(cf, GRAPH_CHUNKID_DATA, graph_read_commit_data, graph)) {
error(_("commit-graph required commit data chunk missing or corrupted"));
goto free_and_return;
}
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);
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)
{
if (!o->commit_graph)
return;
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, 0);
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);
for (i = 0; i < ctx->num_commit_graphs_before; i++)
free(ctx->commit_graph_filenames_before[i]);
free(ctx->commit_graph_filenames_before);
for (i = 0; i < ctx->num_commit_graphs_after; i++) {
free(ctx->commit_graph_filenames_after[i]);
free(ctx->commit_graph_hash_after[i]);
}
free(ctx->commit_graph_filenames_after);
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;
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;
}
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