Smart push over HTTP: client side
The git-remote-curl backend detects if the remote server supports the git-receive-pack service, and if so, runs git-send-pack in a pipe to dump the command and pack data as a single POST request. The advertisements from the server that were obtained during the discovery are passed into git-send-pack before the POST request starts. This permits git-send-pack to operate largely unmodified. For smaller packs (those under 1 MiB) a HTTP/1.0 POST with a Content-Length is used, permitting interaction with any server. The 1 MiB limit is arbitrary, but is sufficent to fit most deltas created by human authors against text sources with the occasional small binary file (e.g. few KiB icon image). The configuration option http.postBuffer can be used to increase (or shink) this buffer if the default is not sufficient. For larger packs which cannot be spooled entirely into the helper's memory space (due to http.postBuffer being too small), the POST request requires HTTP/1.1 and sets "Transfer-Encoding: chunked". This permits the client to upload an unknown amount of data in one HTTP transaction without needing to pregenerate the entire pack file locally. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> CC: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shawn O. Pearce
Junio C Hamano
parent
97cc7bc45c
commit
de1a2fdd38
@ -1089,6 +1089,14 @@ http.maxRequests::
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How many HTTP requests to launch in parallel. Can be overridden
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by the 'GIT_HTTP_MAX_REQUESTS' environment variable. Default is 5.
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http.postBuffer::
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Maximum size in bytes of the buffer used by smart HTTP
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transports when POSTing data to the remote system.
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For requests larger than this buffer size, HTTP/1.1 and
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Transfer-Encoding: chunked is used to avoid creating a
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massive pack file locally. Default is 1 MiB, which is
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sufficient for most requests.
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http.lowSpeedLimit, http.lowSpeedTime::
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If the HTTP transfer speed is less than 'http.lowSpeedLimit'
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for longer than 'http.lowSpeedTime' seconds, the transfer is aborted.
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@ -2,9 +2,11 @@
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#include "commit.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "run-command.h"
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#include "remote.h"
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#include "send-pack.h"
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#include "quote.h"
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static const char send_pack_usage[] =
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"git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
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@ -59,7 +61,7 @@ static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *ext
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memset(&po, 0, sizeof(po));
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po.argv = argv;
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po.in = -1;
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po.out = fd;
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po.out = args->stateless_rpc ? -1 : fd;
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po.git_cmd = 1;
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if (start_command(&po))
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die_errno("git pack-objects failed");
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@ -83,6 +85,20 @@ static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *ext
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}
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close(po.in);
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if (args->stateless_rpc) {
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char *buf = xmalloc(LARGE_PACKET_MAX);
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while (1) {
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ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
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if (n <= 0)
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break;
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send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
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}
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free(buf);
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close(po.out);
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po.out = -1;
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}
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if (finish_command(&po))
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return error("pack-objects died with strange error");
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return 0;
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@ -303,6 +319,59 @@ static int refs_pushed(struct ref *ref)
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return 0;
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}
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static void print_helper_status(struct ref *ref)
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{
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struct strbuf buf = STRBUF_INIT;
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for (; ref; ref = ref->next) {
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const char *msg = NULL;
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const char *res;
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switch(ref->status) {
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case REF_STATUS_NONE:
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res = "error";
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msg = "no match";
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break;
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case REF_STATUS_OK:
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res = "ok";
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break;
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case REF_STATUS_UPTODATE:
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res = "ok";
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msg = "up to date";
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break;
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case REF_STATUS_REJECT_NONFASTFORWARD:
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res = "error";
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msg = "non-fast forward";
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break;
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case REF_STATUS_REJECT_NODELETE:
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case REF_STATUS_REMOTE_REJECT:
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res = "error";
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break;
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case REF_STATUS_EXPECTING_REPORT:
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default:
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continue;
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}
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strbuf_reset(&buf);
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strbuf_addf(&buf, "%s %s", res, ref->name);
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if (ref->remote_status)
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msg = ref->remote_status;
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if (msg) {
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strbuf_addch(&buf, ' ');
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quote_two_c_style(&buf, "", msg, 0);
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}
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strbuf_addch(&buf, '\n');
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safe_write(1, buf.buf, buf.len);
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}
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strbuf_release(&buf);
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}
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int send_pack(struct send_pack_args *args,
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int fd[], struct child_process *conn,
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struct ref *remote_refs,
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@ -310,6 +379,7 @@ int send_pack(struct send_pack_args *args,
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{
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int in = fd[0];
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int out = fd[1];
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struct strbuf req_buf = STRBUF_INIT;
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struct ref *ref;
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int new_refs;
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int ask_for_status_report = 0;
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@ -391,14 +461,14 @@ int send_pack(struct send_pack_args *args,
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char *new_hex = sha1_to_hex(ref->new_sha1);
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if (ask_for_status_report) {
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packet_write(out, "%s %s %s%c%s",
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packet_buf_write(&req_buf, "%s %s %s%c%s",
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old_hex, new_hex, ref->name, 0,
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"report-status");
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ask_for_status_report = 0;
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expect_status_report = 1;
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}
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else
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packet_write(out, "%s %s %s",
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packet_buf_write(&req_buf, "%s %s %s",
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old_hex, new_hex, ref->name);
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}
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ref->status = expect_status_report ?
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@ -406,7 +476,17 @@ int send_pack(struct send_pack_args *args,
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REF_STATUS_OK;
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}
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if (args->stateless_rpc) {
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if (!args->dry_run) {
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packet_buf_flush(&req_buf);
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send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
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}
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} else {
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safe_write(out, req_buf.buf, req_buf.len);
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packet_flush(out);
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}
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strbuf_release(&req_buf);
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if (new_refs && !args->dry_run) {
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if (pack_objects(out, remote_refs, extra_have, args) < 0) {
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for (ref = remote_refs; ref; ref = ref->next)
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@ -414,11 +494,15 @@ int send_pack(struct send_pack_args *args,
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return -1;
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}
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}
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if (args->stateless_rpc && !args->dry_run)
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packet_flush(out);
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if (expect_status_report)
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ret = receive_status(in, remote_refs);
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else
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ret = 0;
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if (args->stateless_rpc)
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packet_flush(out);
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if (ret < 0)
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return ret;
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@ -478,6 +562,7 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
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struct extra_have_objects extra_have;
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struct ref *remote_refs, *local_refs;
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int ret;
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int helper_status = 0;
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int send_all = 0;
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const char *receivepack = "git-receive-pack";
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int flags;
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@ -523,6 +608,14 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
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args.use_thin_pack = 1;
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continue;
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}
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if (!strcmp(arg, "--stateless-rpc")) {
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args.stateless_rpc = 1;
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continue;
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}
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if (!strcmp(arg, "--helper-status")) {
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helper_status = 1;
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continue;
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}
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usage(send_pack_usage);
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}
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if (!dest) {
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@ -551,7 +644,14 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
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}
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}
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conn = git_connect(fd, dest, receivepack, args.verbose ? CONNECT_VERBOSE : 0);
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if (args.stateless_rpc) {
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conn = NULL;
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fd[0] = 0;
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fd[1] = 1;
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} else {
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conn = git_connect(fd, dest, receivepack,
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args.verbose ? CONNECT_VERBOSE : 0);
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}
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memset(&extra_have, 0, sizeof(extra_have));
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@ -575,11 +675,15 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
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ret = send_pack(&args, fd, conn, remote_refs, &extra_have);
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if (helper_status)
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print_helper_status(remote_refs);
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close(fd[1]);
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close(fd[0]);
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ret |= finish_connect(conn);
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if (!helper_status)
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print_push_status(dest, remote_refs);
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if (!args.dry_run && remote) {
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13
http.c
13
http.c
@ -1,9 +1,11 @@
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#include "http.h"
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#include "pack.h"
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#include "sideband.h"
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int data_received;
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int active_requests;
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int http_is_verbose;
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size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
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#ifdef USE_CURL_MULTI
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static int max_requests = -1;
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@ -97,8 +99,6 @@ size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
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return eltsize * nmemb;
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}
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static void finish_active_slot(struct active_request_slot *slot);
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#ifdef USE_CURL_MULTI
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static void process_curl_messages(void)
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{
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@ -174,6 +174,13 @@ static int http_options(const char *var, const char *value, void *cb)
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if (!strcmp("http.proxy", var))
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return git_config_string(&curl_http_proxy, var, value);
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if (!strcmp("http.postbuffer", var)) {
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http_post_buffer = git_config_int(var, value);
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if (http_post_buffer < LARGE_PACKET_MAX)
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http_post_buffer = LARGE_PACKET_MAX;
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return 0;
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}
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/* Fall back on the default ones */
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return git_default_config(var, value, cb);
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}
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@ -638,7 +645,7 @@ void release_active_slot(struct active_request_slot *slot)
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#endif
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}
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static void finish_active_slot(struct active_request_slot *slot)
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void finish_active_slot(struct active_request_slot *slot)
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{
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closedown_active_slot(slot);
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curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
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2
http.h
2
http.h
@ -79,6 +79,7 @@ extern curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
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extern struct active_request_slot *get_active_slot(void);
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extern int start_active_slot(struct active_request_slot *slot);
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extern void run_active_slot(struct active_request_slot *slot);
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extern void finish_active_slot(struct active_request_slot *slot);
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extern void finish_all_active_slots(void);
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extern void release_active_slot(struct active_request_slot *slot);
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@ -94,6 +95,7 @@ extern void http_cleanup(void);
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extern int data_received;
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extern int active_requests;
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extern int http_is_verbose;
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extern size_t http_post_buffer;
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extern char curl_errorstr[CURL_ERROR_SIZE];
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235
remote-curl.c
235
remote-curl.c
@ -6,6 +6,7 @@
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#include "exec_cmd.h"
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#include "run-command.h"
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#include "pkt-line.h"
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#include "sideband.h"
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static struct remote *remote;
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static const char *url;
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@ -16,7 +17,8 @@ struct options {
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unsigned long depth;
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unsigned progress : 1,
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followtags : 1,
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dry_run : 1;
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dry_run : 1,
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thin : 1;
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};
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static struct options options;
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@ -274,6 +276,188 @@ static void output_refs(struct ref *refs)
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free_refs(refs);
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}
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struct rpc_state {
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const char *service_name;
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const char **argv;
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char *service_url;
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char *hdr_content_type;
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char *hdr_accept;
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char *buf;
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size_t alloc;
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size_t len;
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size_t pos;
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int in;
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int out;
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struct strbuf result;
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};
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static size_t rpc_out(void *ptr, size_t eltsize,
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size_t nmemb, void *buffer_)
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{
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size_t max = eltsize * nmemb;
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struct rpc_state *rpc = buffer_;
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size_t avail = rpc->len - rpc->pos;
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if (!avail) {
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avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
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if (!avail)
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return 0;
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rpc->pos = 0;
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rpc->len = avail;
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}
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if (max < avail);
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avail = max;
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memcpy(ptr, rpc->buf + rpc->pos, avail);
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rpc->pos += avail;
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return avail;
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}
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static size_t rpc_in(const void *ptr, size_t eltsize,
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size_t nmemb, void *buffer_)
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{
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size_t size = eltsize * nmemb;
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struct rpc_state *rpc = buffer_;
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write_or_die(rpc->in, ptr, size);
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return size;
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}
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static int post_rpc(struct rpc_state *rpc)
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{
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struct active_request_slot *slot;
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struct slot_results results;
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struct curl_slist *headers = NULL;
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int err = 0, large_request = 0;
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/* Try to load the entire request, if we can fit it into the
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* allocated buffer space we can use HTTP/1.0 and avoid the
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* chunked encoding mess.
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*/
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while (1) {
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size_t left = rpc->alloc - rpc->len;
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char *buf = rpc->buf + rpc->len;
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int n;
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if (left < LARGE_PACKET_MAX) {
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large_request = 1;
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break;
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}
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n = packet_read_line(rpc->out, buf, left);
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if (!n)
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break;
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rpc->len += n;
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}
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slot = get_active_slot();
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slot->results = &results;
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curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
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curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
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curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
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headers = curl_slist_append(headers, rpc->hdr_content_type);
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headers = curl_slist_append(headers, rpc->hdr_accept);
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if (large_request) {
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/* The request body is large and the size cannot be predicted.
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* We must use chunked encoding to send it.
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*/
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headers = curl_slist_append(headers, "Expect: 100-continue");
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headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
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curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
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curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
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if (options.verbosity > 1) {
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fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
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fflush(stderr);
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}
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} else {
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/* We know the complete request size in advance, use the
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* more normal Content-Length approach.
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*/
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curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
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curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
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if (options.verbosity > 1) {
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fprintf(stderr, "POST %s (%lu bytes)\n",
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rpc->service_name, (unsigned long)rpc->len);
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fflush(stderr);
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}
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}
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curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
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curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
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curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
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slot->curl_result = curl_easy_perform(slot->curl);
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finish_active_slot(slot);
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if (results.curl_result != CURLE_OK) {
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err |= error("RPC failed; result=%d, HTTP code = %ld",
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results.curl_result, results.http_code);
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}
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curl_slist_free_all(headers);
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return err;
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}
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static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
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{
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const char *svc = rpc->service_name;
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struct strbuf buf = STRBUF_INIT;
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struct child_process client;
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int err = 0;
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init_walker();
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memset(&client, 0, sizeof(client));
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client.in = -1;
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client.out = -1;
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client.git_cmd = 1;
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client.argv = rpc->argv;
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if (start_command(&client))
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exit(1);
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||||
if (heads)
|
||||
write_or_die(client.in, heads->buf, heads->len);
|
||||
|
||||
rpc->alloc = http_post_buffer;
|
||||
rpc->buf = xmalloc(rpc->alloc);
|
||||
rpc->in = client.in;
|
||||
rpc->out = client.out;
|
||||
strbuf_init(&rpc->result, 0);
|
||||
|
||||
strbuf_addf(&buf, "%s/%s", url, svc);
|
||||
rpc->service_url = strbuf_detach(&buf, NULL);
|
||||
|
||||
strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
|
||||
rpc->hdr_content_type = strbuf_detach(&buf, NULL);
|
||||
|
||||
strbuf_addf(&buf, "Accept: application/x-%s-response", svc);
|
||||
rpc->hdr_accept = strbuf_detach(&buf, NULL);
|
||||
|
||||
while (!err) {
|
||||
int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
|
||||
if (!n)
|
||||
break;
|
||||
rpc->pos = 0;
|
||||
rpc->len = n;
|
||||
err |= post_rpc(rpc);
|
||||
}
|
||||
strbuf_read(&rpc->result, client.out, 0);
|
||||
|
||||
close(client.in);
|
||||
close(client.out);
|
||||
client.in = -1;
|
||||
client.out = -1;
|
||||
|
||||
err |= finish_command(&client);
|
||||
free(rpc->service_url);
|
||||
free(rpc->hdr_content_type);
|
||||
free(rpc->hdr_accept);
|
||||
free(rpc->buf);
|
||||
strbuf_release(&buf);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fetch_dumb(int nr_heads, struct ref **to_fetch)
|
||||
{
|
||||
char **targets = xmalloc(nr_heads * sizeof(char*));
|
||||
@ -371,6 +555,52 @@ static int push_dav(int nr_spec, char **specs)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int push_git(struct discovery *heads, int nr_spec, char **specs)
|
||||
{
|
||||
struct rpc_state rpc;
|
||||
const char **argv;
|
||||
int argc = 0, i, err;
|
||||
|
||||
argv = xmalloc((10 + nr_spec) * sizeof(char*));
|
||||
argv[argc++] = "send-pack";
|
||||
argv[argc++] = "--stateless-rpc";
|
||||
argv[argc++] = "--helper-status";
|
||||
if (options.thin)
|
||||
argv[argc++] = "--thin";
|
||||
if (options.dry_run)
|
||||
argv[argc++] = "--dry-run";
|
||||
if (options.verbosity > 1)
|
||||
argv[argc++] = "--verbose";
|
||||
argv[argc++] = url;
|
||||
for (i = 0; i < nr_spec; i++)
|
||||
argv[argc++] = specs[i];
|
||||
argv[argc++] = NULL;
|
||||
|
||||
memset(&rpc, 0, sizeof(rpc));
|
||||
rpc.service_name = "git-receive-pack",
|
||||
rpc.argv = argv;
|
||||
|
||||
err = rpc_service(&rpc, heads);
|
||||
if (rpc.result.len)
|
||||
safe_write(1, rpc.result.buf, rpc.result.len);
|
||||
strbuf_release(&rpc.result);
|
||||
free(argv);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int push(int nr_spec, char **specs)
|
||||
{
|
||||
struct discovery *heads = discover_refs("git-receive-pack");
|
||||
int ret;
|
||||
|
||||
if (heads->proto_git)
|
||||
ret = push_git(heads, nr_spec, specs);
|
||||
else
|
||||
ret = push_dav(nr_spec, specs);
|
||||
free_discovery(heads);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void parse_push(struct strbuf *buf)
|
||||
{
|
||||
char **specs = NULL;
|
||||
@ -391,7 +621,7 @@ static void parse_push(struct strbuf *buf)
|
||||
break;
|
||||
} while (1);
|
||||
|
||||
if (push_dav(nr_spec, specs))
|
||||
if (push(nr_spec, specs))
|
||||
exit(128); /* error already reported */
|
||||
for (i = 0; i < nr_spec; i++)
|
||||
free(specs[i]);
|
||||
@ -414,6 +644,7 @@ int main(int argc, const char **argv)
|
||||
|
||||
options.verbosity = 1;
|
||||
options.progress = !!isatty(2);
|
||||
options.thin = 1;
|
||||
|
||||
remote = remote_get(argv[1]);
|
||||
|
||||
|
||||
@ -8,7 +8,8 @@ struct send_pack_args {
|
||||
force_update:1,
|
||||
use_thin_pack:1,
|
||||
use_ofs_delta:1,
|
||||
dry_run:1;
|
||||
dry_run:1,
|
||||
stateless_rpc:1;
|
||||
};
|
||||
|
||||
int send_pack(struct send_pack_args *args,
|
||||
|
||||
@ -135,9 +135,14 @@ ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet
|
||||
n = sz;
|
||||
if (packet_max - 5 < n)
|
||||
n = packet_max - 5;
|
||||
if (0 <= band) {
|
||||
sprintf(hdr, "%04x", n + 5);
|
||||
hdr[4] = band;
|
||||
safe_write(fd, hdr, 5);
|
||||
} else {
|
||||
sprintf(hdr, "%04x", n + 4);
|
||||
safe_write(fd, hdr, 4);
|
||||
}
|
||||
safe_write(fd, p, n);
|
||||
p += n;
|
||||
sz -= n;
|
||||
|
||||
@ -731,6 +731,7 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
|
||||
NULL);
|
||||
}
|
||||
|
||||
memset(&args, 0, sizeof(args));
|
||||
args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
|
||||
args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
|
||||
args.use_thin_pack = data->thin;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user