[PATCH 3/4] fetch-pack: Implement no-done capability
- From
Shawn O. Pearce <spearce@spearce.org>
- Date
- Mar 15, 2011, 00:59 UTC
- Message-ID
- <1300150780-7487-3-git-send-email-spearce@spearce.org>
- In-Reply-To
- <1300150780-7487-1-git-send-email-spearce@spearce.org>
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> --- builtin/fetch-pack.c | 18 +++++++++++++++--- 1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c index 5173dc9..59fbda5 100644 --- a/builtin/fetch-pack.c +++ b/builtin/fetch-pack.c @@ -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)
-- 1.7.4.1.35.ga52fb.dirty