#include "cache.h"
#include "config.h"
+#include "dir.h"
#include "git-compat-util.h"
#include "lockfile.h"
#include "pack.h"
#define GRAPH_LAST_EDGE 0x80000000
+#define GRAPH_HEADER_SIZE 8
#define GRAPH_FANOUT_SIZE (4 * 256)
#define GRAPH_CHUNKLOOKUP_WIDTH 12
-#define GRAPH_MIN_SIZE (5 * GRAPH_CHUNKLOOKUP_WIDTH + GRAPH_FANOUT_SIZE + \
- GRAPH_OID_LEN + 8)
+#define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
+ + GRAPH_FANOUT_SIZE + GRAPH_OID_LEN)
char *get_commit_graph_filename(const char *obj_dir)
{
return &commit_list_insert(c, pptr)->next;
}
+static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
+{
+ const unsigned char *commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * pos;
+ item->graph_pos = pos;
+ item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
+}
+
static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t pos)
{
uint32_t edge_value;
date_low = get_be32(commit_data + g->hash_len + 12);
item->date = (timestamp_t)((date_high << 32) | date_low);
+ item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
+
pptr = &item->parents;
edge_value = get_be32(commit_data + g->hash_len);
return 1;
}
-int parse_commit_in_graph(struct commit *item)
+static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
+{
+ if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
+ *pos = item->graph_pos;
+ return 1;
+ } else {
+ return bsearch_graph(g, &(item->object.oid), pos);
+ }
+}
+
+static int parse_commit_in_graph_one(struct commit_graph *g, struct commit *item)
{
+ uint32_t pos;
+
if (!core_commit_graph)
return 0;
if (item->object.parsed)
return 1;
- prepare_commit_graph();
- if (commit_graph) {
- uint32_t pos;
- int found;
- if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
- pos = item->graph_pos;
- found = 1;
- } else {
- found = bsearch_graph(commit_graph, &(item->object.oid), &pos);
- }
+ if (find_commit_in_graph(item, g, &pos))
+ return fill_commit_in_graph(item, g, pos);
- if (found)
- return fill_commit_in_graph(item, commit_graph, pos);
- }
+ return 0;
+}
+int parse_commit_in_graph(struct commit *item)
+{
+ if (!core_commit_graph)
+ return 0;
+
+ prepare_commit_graph();
+ if (commit_graph)
+ return parse_commit_in_graph_one(commit_graph, item);
return 0;
}
+void load_commit_graph_info(struct commit *item)
+{
+ uint32_t pos;
+ if (!core_commit_graph)
+ return;
+ prepare_commit_graph();
+ if (commit_graph && find_commit_in_graph(item, commit_graph, &pos))
+ fill_commit_graph_info(item, commit_graph, pos);
+}
+
static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c)
{
struct object_id oid;
return c->maybe_tree;
}
-struct tree *get_commit_tree_in_graph(const struct commit *c)
+static struct tree *get_commit_tree_in_graph_one(struct commit_graph *g,
+ const struct commit *c)
{
if (c->maybe_tree)
return c->maybe_tree;
if (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
- BUG("get_commit_tree_in_graph called from non-commit-graph commit");
+ BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
- return load_tree_for_commit(commit_graph, (struct commit *)c);
+ return load_tree_for_commit(g, (struct commit *)c);
+}
+
+struct tree *get_commit_tree_in_graph(const struct commit *c)
+{
+ return get_commit_tree_in_graph_one(commit_graph, c);
}
static void write_graph_chunk_fanout(struct hashfile *f,
else
packedDate[0] = 0;
+ packedDate[0] |= htonl((*list)->generation << 2);
+
packedDate[1] = htonl((*list)->date);
hashwrite(f, packedDate, 8);
}
}
+static void compute_generation_numbers(struct packed_commit_list* commits)
+{
+ int i;
+ struct commit_list *list = NULL;
+
+ for (i = 0; i < commits->nr; i++) {
+ if (commits->list[i]->generation != GENERATION_NUMBER_INFINITY &&
+ commits->list[i]->generation != GENERATION_NUMBER_ZERO)
+ continue;
+
+ commit_list_insert(commits->list[i], &list);
+ while (list) {
+ struct commit *current = list->item;
+ struct commit_list *parent;
+ int all_parents_computed = 1;
+ uint32_t max_generation = 0;
+
+ for (parent = current->parents; parent; parent = parent->next) {
+ if (parent->item->generation == GENERATION_NUMBER_INFINITY ||
+ parent->item->generation == GENERATION_NUMBER_ZERO) {
+ all_parents_computed = 0;
+ commit_list_insert(parent->item, &list);
+ break;
+ } else if (parent->item->generation > max_generation) {
+ max_generation = parent->item->generation;
+ }
+ }
+
+ if (all_parents_computed) {
+ current->generation = max_generation + 1;
+ pop_commit(&list);
+
+ if (current->generation > GENERATION_NUMBER_MAX)
+ current->generation = GENERATION_NUMBER_MAX;
+ }
+ }
+ }
+}
+
void write_commit_graph(const char *obj_dir,
const char **pack_indexes,
int nr_packs,
struct hashfile *f;
uint32_t i, count_distinct = 0;
char *graph_name;
- int fd;
struct lock_file lk = LOCK_INIT;
uint32_t chunk_ids[5];
uint64_t chunk_offsets[5];
if (commits.nr >= GRAPH_PARENT_MISSING)
die(_("too many commits to write graph"));
- graph_name = get_commit_graph_filename(obj_dir);
- fd = hold_lock_file_for_update(&lk, graph_name, 0);
-
- if (fd < 0) {
- struct strbuf folder = STRBUF_INIT;
- strbuf_addstr(&folder, graph_name);
- strbuf_setlen(&folder, strrchr(folder.buf, '/') - folder.buf);
+ compute_generation_numbers(&commits);
- if (mkdir(folder.buf, 0777) < 0)
- die_errno(_("cannot mkdir %s"), folder.buf);
- strbuf_release(&folder);
-
- fd = hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
-
- if (fd < 0)
- die_errno("unable to create '%s'", graph_name);
- }
+ graph_name = get_commit_graph_filename(obj_dir);
+ if (safe_create_leading_directories(graph_name))
+ die_errno(_("unable to create leading directories of %s"),
+ graph_name);
+ hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
hashwrite_be32(f, GRAPH_SIGNATURE);
oids.alloc = 0;
oids.nr = 0;
}
+
+static int verify_commit_graph_error;
+
+static void graph_report(const char *fmt, ...)
+{
+ va_list ap;
+
+ verify_commit_graph_error = 1;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n");
+ va_end(ap);
+}
+
+int verify_commit_graph(struct repository *r, struct commit_graph *g)
+{
+ uint32_t i, cur_fanout_pos = 0;
+ struct object_id prev_oid, cur_oid;
+
+ if (!g) {
+ graph_report("no commit-graph file loaded");
+ return 1;
+ }
+
+ verify_commit_graph_error = 0;
+
+ if (!g->chunk_oid_fanout)
+ graph_report("commit-graph is missing the OID Fanout chunk");
+ if (!g->chunk_oid_lookup)
+ graph_report("commit-graph is missing the OID Lookup chunk");
+ if (!g->chunk_commit_data)
+ graph_report("commit-graph is missing the Commit Data chunk");
+
+ if (verify_commit_graph_error)
+ return verify_commit_graph_error;
+
+ for (i = 0; i < g->num_commits; i++) {
+ hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
+
+ if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
+ graph_report("commit-graph has incorrect OID order: %s then %s",
+ oid_to_hex(&prev_oid),
+ oid_to_hex(&cur_oid));
+
+ oidcpy(&prev_oid, &cur_oid);
+
+ while (cur_oid.hash[0] > cur_fanout_pos) {
+ uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
+
+ if (i != fanout_value)
+ graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u",
+ cur_fanout_pos, fanout_value, i);
+ cur_fanout_pos++;
+ }
+ }
+
+ 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++;
+ }
+
+ return verify_commit_graph_error;
+}