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fetch-pack: Implement no-done capability

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If enabled on the connection "multi_ack_detailed no-done" as a
pair allows the remote upload-pack process to send a PACK down
to the client as soon as a "ACK %s ready" message was also sent.

Over git:// and ssh:// where a bi-directional stream is in place
this has very little difference over the classical version that
waits for the client to send a "done\n" line by itself.  It does
slightly reduce the latency involved to start the pack stream as
there is one less round-trip from client->server required.

Over smart HTTP this avoids needing to send a final RPC that has
all of the prior common objects.  Instead the server is able to
return a pack as soon as its ready to.  For many common users the
smart HTTP fetch is now just 2 requests: GET .../info/refs, and
a POST .../git-upload-pack to not only negotiate but also receive
the pack stream.  Only users who have more than 32 local unshared
commits with the remote will need additional requests to negotiate
a common merge base.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shawn O. Pearce 2011-03-14 17:59:39 -07:00 committed by Junio C Hamano
parent f2cba9299b
commit 761ecf0bc7
1 changed files with 15 additions and 3 deletions
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18
builtin/fetch-pack.c
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@ -14,6 +14,7 @@ static int transfer_unpack_limit = -1;
static int fetch_unpack_limit = -1;
static int unpack_limit = 100;
static int prefer_ofs_delta = 1;
static int no_done = 0;
static struct fetch_pack_args args = {
/* .uploadpack = */ "git-upload-pack",
};
@ -225,6 +226,7 @@ static int find_common(int fd[2], unsigned char *result_sha1,
const unsigned char *sha1;
unsigned in_vain = 0;
int got_continue = 0;
int got_ready = 0;
struct strbuf req_buf = STRBUF_INIT;
size_t state_len = 0;
@ -262,6 +264,7 @@ static int find_common(int fd[2], unsigned char *result_sha1,
struct strbuf c = STRBUF_INIT;
if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
if (no_done) strbuf_addstr(&c, " no-done");
if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
if (use_sideband == 1) strbuf_addstr(&c, " side-band");
if (args.use_thin_pack) strbuf_addstr(&c, " thin-pack");
@ -379,8 +382,10 @@ static int find_common(int fd[2], unsigned char *result_sha1,
retval = 0;
in_vain = 0;
got_continue = 1;
if (ack == ACK_ready)
if (ack == ACK_ready) {
rev_list = NULL;
got_ready = 1;
}
break;
}
}
@ -394,8 +399,10 @@ static int find_common(int fd[2], unsigned char *result_sha1,
}
}
done:
packet_buf_write(&req_buf, "done\n");
send_request(fd[1], &req_buf);
if (!got_ready || !no_done) {
packet_buf_write(&req_buf, "done\n");
send_request(fd[1], &req_buf);
}
if (args.verbose)
fprintf(stderr, "done\n");
if (retval != 0) {
@ -698,6 +705,11 @@ static struct ref *do_fetch_pack(int fd[2],
if (args.verbose)
fprintf(stderr, "Server supports multi_ack_detailed\n");
multi_ack = 2;
if (server_supports("no-done")) {
if (args.verbose)
fprintf(stderr, "Server supports no-done\n");
no_done = 1;
}
}
else if (server_supports("multi_ack")) {
if (args.verbose)