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Merge branch 'ds/commit-graph-lockfile-fix'

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Update to ds/generation-numbers topic.

* ds/commit-graph-lockfile-fix:
  commit-graph: fix UX issue when .lock file exists
  commit-graph.txt: update design document
  merge: check config before loading commits
  commit: use generation number in remove_redundant()
  commit: add short-circuit to paint_down_to_common()
  commit: use generation numbers for in_merge_bases()
  ref-filter: use generation number for --contains
  commit-graph: always load commit-graph information
  commit: use generations in paint_down_to_common()
  commit-graph: compute generation numbers
  commit: add generation number to struct commit
  ref-filter: fix outdated comment on in_commit_list
This commit is contained in:
Junio C Hamano
2018-06-25 13:22:36 -07:00
parent b3b2aaf0fd 33286dcd6d
commit a856e7d69f
11 changed files with 209 additions and 56 deletions
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113
commit-graph.c
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@ -1,5 +1,6 @@
#include "cache.h"
#include "config.h"
#include "dir.h"
#include "git-compat-util.h"
#include "lockfile.h"
#include "pack.h"
@ -248,6 +249,13 @@ static struct commit_list **insert_parent_or_die(struct commit_graph *g,
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;
@ -265,6 +273,8 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
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);
@ -293,31 +303,40 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
return 1;
}
static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
{
if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
*pos = item->graph_pos;
return 1;
} else {
return bsearch_graph(g, &(item->object.oid), pos);
}
}
int parse_commit_in_graph(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 (found)
return fill_commit_in_graph(item, commit_graph, pos);
}
if (commit_graph && find_commit_in_graph(item, commit_graph, &pos))
return fill_commit_in_graph(item, commit_graph, pos);
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;
@ -440,6 +459,8 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
else
packedDate[0] = 0;
packedDate[0] |= htonl((*list)->generation << 2);
packedDate[1] = htonl((*list)->date);
hashwrite(f, packedDate, 8);
@ -572,6 +593,45 @@ static void close_reachable(struct packed_oid_list *oids)
}
}
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,
@ -584,7 +644,6 @@ void write_commit_graph(const char *obj_dir,
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];
@ -695,24 +754,14 @@ void write_commit_graph(const char *obj_dir,
if (commits.nr >= GRAPH_PARENT_MISSING)
die(_("too many commits to write graph"));
compute_generation_numbers(&commits);
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);
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);
}
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);