diff options
| -rw-r--r-- | upload-pack.c | 101 |
1 files changed, 92 insertions, 9 deletions
diff --git a/upload-pack.c b/upload-pack.c index 35c7ecb..e8f4be3 100644 --- a/upload-pack.c +++ b/upload-pack.c @@ -11,9 +11,15 @@ static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>"; -#define THEY_HAVE (1U << 0) -#define OUR_REF (1U << 1) -#define WANTED (1U << 2) +/* bits #0..7 in revision.h, #8..10 in commit.c */ +#define THEY_HAVE (1u << 11) +#define OUR_REF (1u << 12) +#define WANTED (1u << 13) +#define COMMON_KNOWN (1u << 14) +#define REACHABLE (1u << 15) + +static unsigned long oldest_have = 0; + static int multi_ack = 0, nr_our_refs = 0; static int use_thin_pack = 0; static struct object_array have_obj; @@ -323,11 +329,12 @@ static void create_pack_file(void) static int got_sha1(char *hex, unsigned char *sha1) { struct object *o; + int we_knew_they_have = 0; if (get_sha1_hex(hex, sha1)) die("git-upload-pack: expected SHA1 object, got '%s'", hex); if (!has_sha1_file(sha1)) - return 0; + return -1; o = lookup_object(sha1); if (!(o && o->parsed)) @@ -336,15 +343,84 @@ static int got_sha1(char *hex, unsigned char *sha1) die("oops (%s)", sha1_to_hex(sha1)); if (o->type == OBJ_COMMIT) { struct commit_list *parents; + struct commit *commit = (struct commit *)o; if (o->flags & THEY_HAVE) - return 0; - o->flags |= THEY_HAVE; - for (parents = ((struct commit*)o)->parents; + we_knew_they_have = 1; + else + o->flags |= THEY_HAVE; + if (!oldest_have || (commit->date < oldest_have)) + oldest_have = commit->date; + for (parents = commit->parents; parents; parents = parents->next) parents->item->object.flags |= THEY_HAVE; } - add_object_array(o, NULL, &have_obj); + if (!we_knew_they_have) { + add_object_array(o, NULL, &have_obj); + return 1; + } + return 0; +} + +static int reachable(struct commit *want) +{ + struct commit_list *work = NULL; + + insert_by_date(want, &work); + while (work) { + struct commit_list *list = work->next; + struct commit *commit = work->item; + free(work); + work = list; + + if (commit->object.flags & THEY_HAVE) { + want->object.flags |= COMMON_KNOWN; + break; + } + if (!commit->object.parsed) + parse_object(commit->object.sha1); + if (commit->object.flags & REACHABLE) + continue; + commit->object.flags |= REACHABLE; + if (commit->date < oldest_have) + continue; + for (list = commit->parents; list; list = list->next) { + struct commit *parent = list->item; + if (!(parent->object.flags & REACHABLE)) + insert_by_date(parent, &work); + } + } + want->object.flags |= REACHABLE; + clear_commit_marks(want, REACHABLE); + free_commit_list(work); + return (want->object.flags & COMMON_KNOWN); +} + +static int ok_to_give_up(void) +{ + int i; + + if (!have_obj.nr) + return 0; + + for (i = 0; i < want_obj.nr; i++) { + struct object *want = want_obj.objects[i].item; + + if (want->flags & COMMON_KNOWN) + continue; + want = deref_tag(want, "a want line", 0); + if (!want || want->type != OBJ_COMMIT) { + /* no way to tell if this is reachable by + * looking at the ancestry chain alone, so + * leave a note to ourselves not to worry about + * this object anymore. + */ + want_obj.objects[i].item->flags |= COMMON_KNOWN; + continue; + } + if (!reachable((struct commit *)want)) + return 0; + } return 1; } @@ -369,7 +445,13 @@ static int get_common_commits(void) } len = strip(line, len); if (!strncmp(line, "have ", 5)) { - if (got_sha1(line+5, sha1)) { + switch (got_sha1(line+5, sha1)) { + case -1: /* they have what we do not */ + if (multi_ack && ok_to_give_up()) + packet_write(1, "ACK %s continue\n", + sha1_to_hex(sha1)); + break; + default: memcpy(hex, sha1_to_hex(sha1), 41); if (multi_ack) { const char *msg = "ACK %s continue\n"; @@ -378,6 +460,7 @@ static int get_common_commits(void) } else if (have_obj.nr == 1) packet_write(1, "ACK %s\n", hex); + break; } continue; } |