t0612: add tests to exercise Git/JGit reftable compatibility
[alt-git.git] / transport-helper.c
blob8d284b24d5d5e79434932a12e38d06f15ac665da
1 #include "git-compat-util.h"
2 #include "transport.h"
3 #include "quote.h"
4 #include "run-command.h"
5 #include "commit.h"
6 #include "environment.h"
7 #include "gettext.h"
8 #include "hex.h"
9 #include "object-name.h"
10 #include "repository.h"
11 #include "remote.h"
12 #include "string-list.h"
13 #include "thread-utils.h"
14 #include "sigchain.h"
15 #include "strvec.h"
16 #include "refs.h"
17 #include "refspec.h"
18 #include "transport-internal.h"
19 #include "protocol.h"
20 #include "packfile.h"
22 static int debug;
24 struct helper_data {
25 const char *name;
26 struct child_process *helper;
27 FILE *out;
28 unsigned fetch : 1,
29 import : 1,
30 bidi_import : 1,
31 export : 1,
32 option : 1,
33 push : 1,
34 connect : 1,
35 stateless_connect : 1,
36 signed_tags : 1,
37 check_connectivity : 1,
38 no_disconnect_req : 1,
39 no_private_update : 1,
40 object_format : 1;
43 * As an optimization, the transport code may invoke fetch before
44 * get_refs_list. If this happens, and if the transport helper doesn't
45 * support connect or stateless_connect, we need to invoke
46 * get_refs_list ourselves if we haven't already done so. Keep track of
47 * whether we have invoked get_refs_list.
49 unsigned get_refs_list_called : 1;
51 char *export_marks;
52 char *import_marks;
53 /* These go from remote name (as in "list") to private name */
54 struct refspec rs;
55 /* Transport options for fetch-pack/send-pack (should one of
56 * those be invoked).
58 struct git_transport_options transport_options;
61 static void sendline(struct helper_data *helper, struct strbuf *buffer)
63 if (debug)
64 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
65 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
66 die_errno(_("full write to remote helper failed"));
69 static int recvline_fh(FILE *helper, struct strbuf *buffer)
71 strbuf_reset(buffer);
72 if (debug)
73 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
74 if (strbuf_getline(buffer, helper) == EOF) {
75 if (debug)
76 fprintf(stderr, "Debug: Remote helper quit.\n");
77 return 1;
80 if (debug)
81 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
82 return 0;
85 static int recvline(struct helper_data *helper, struct strbuf *buffer)
87 return recvline_fh(helper->out, buffer);
90 static void write_constant(int fd, const char *str)
92 if (debug)
93 fprintf(stderr, "Debug: Remote helper: -> %s", str);
94 if (write_in_full(fd, str, strlen(str)) < 0)
95 die_errno(_("full write to remote helper failed"));
98 static const char *remove_ext_force(const char *url)
100 if (url) {
101 const char *colon = strchr(url, ':');
102 if (colon && colon[1] == ':')
103 return colon + 2;
105 return url;
108 static void do_take_over(struct transport *transport)
110 struct helper_data *data;
111 data = (struct helper_data *)transport->data;
112 transport_take_over(transport, data->helper);
113 fclose(data->out);
114 free(data);
117 static void standard_options(struct transport *t);
119 static struct child_process *get_helper(struct transport *transport)
121 struct helper_data *data = transport->data;
122 struct strbuf buf = STRBUF_INIT;
123 struct child_process *helper;
124 int duped;
125 int code;
127 if (data->helper)
128 return data->helper;
130 helper = xmalloc(sizeof(*helper));
131 child_process_init(helper);
132 helper->in = -1;
133 helper->out = -1;
134 helper->err = 0;
135 strvec_pushf(&helper->args, "remote-%s", data->name);
136 strvec_push(&helper->args, transport->remote->name);
137 strvec_push(&helper->args, remove_ext_force(transport->url));
138 helper->git_cmd = 1;
139 helper->silent_exec_failure = 1;
141 if (have_git_dir())
142 strvec_pushf(&helper->env, "%s=%s",
143 GIT_DIR_ENVIRONMENT, get_git_dir());
145 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
147 code = start_command(helper);
148 if (code < 0 && errno == ENOENT)
149 die(_("unable to find remote helper for '%s'"), data->name);
150 else if (code != 0)
151 exit(code);
153 data->helper = helper;
154 data->no_disconnect_req = 0;
155 refspec_init(&data->rs, REFSPEC_FETCH);
158 * Open the output as FILE* so strbuf_getline_*() family of
159 * functions can be used.
160 * Do this with duped fd because fclose() will close the fd,
161 * and stuff like taking over will require the fd to remain.
163 duped = dup(helper->out);
164 if (duped < 0)
165 die_errno(_("can't dup helper output fd"));
166 data->out = xfdopen(duped, "r");
168 write_constant(helper->in, "capabilities\n");
170 while (1) {
171 const char *capname, *arg;
172 int mandatory = 0;
173 if (recvline(data, &buf))
174 exit(128);
176 if (!*buf.buf)
177 break;
179 if (*buf.buf == '*') {
180 capname = buf.buf + 1;
181 mandatory = 1;
182 } else
183 capname = buf.buf;
185 if (debug)
186 fprintf(stderr, "Debug: Got cap %s\n", capname);
187 if (!strcmp(capname, "fetch"))
188 data->fetch = 1;
189 else if (!strcmp(capname, "option"))
190 data->option = 1;
191 else if (!strcmp(capname, "push"))
192 data->push = 1;
193 else if (!strcmp(capname, "import"))
194 data->import = 1;
195 else if (!strcmp(capname, "bidi-import"))
196 data->bidi_import = 1;
197 else if (!strcmp(capname, "export"))
198 data->export = 1;
199 else if (!strcmp(capname, "check-connectivity"))
200 data->check_connectivity = 1;
201 else if (skip_prefix(capname, "refspec ", &arg)) {
202 refspec_append(&data->rs, arg);
203 } else if (!strcmp(capname, "connect")) {
204 data->connect = 1;
205 } else if (!strcmp(capname, "stateless-connect")) {
206 data->stateless_connect = 1;
207 } else if (!strcmp(capname, "signed-tags")) {
208 data->signed_tags = 1;
209 } else if (skip_prefix(capname, "export-marks ", &arg)) {
210 data->export_marks = xstrdup(arg);
211 } else if (skip_prefix(capname, "import-marks ", &arg)) {
212 data->import_marks = xstrdup(arg);
213 } else if (starts_with(capname, "no-private-update")) {
214 data->no_private_update = 1;
215 } else if (starts_with(capname, "object-format")) {
216 data->object_format = 1;
217 } else if (mandatory) {
218 die(_("unknown mandatory capability %s; this remote "
219 "helper probably needs newer version of Git"),
220 capname);
223 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
224 warning(_("this remote helper should implement refspec capability"));
226 strbuf_release(&buf);
227 if (debug)
228 fprintf(stderr, "Debug: Capabilities complete.\n");
229 standard_options(transport);
230 return data->helper;
233 static int disconnect_helper(struct transport *transport)
235 struct helper_data *data = transport->data;
236 int res = 0;
238 if (data->helper) {
239 if (debug)
240 fprintf(stderr, "Debug: Disconnecting.\n");
241 if (!data->no_disconnect_req) {
243 * Ignore write errors; there's nothing we can do,
244 * since we're about to close the pipe anyway. And the
245 * most likely error is EPIPE due to the helper dying
246 * to report an error itself.
248 sigchain_push(SIGPIPE, SIG_IGN);
249 xwrite(data->helper->in, "\n", 1);
250 sigchain_pop(SIGPIPE);
252 close(data->helper->in);
253 close(data->helper->out);
254 fclose(data->out);
255 res = finish_command(data->helper);
256 FREE_AND_NULL(data->helper);
258 return res;
261 static const char *unsupported_options[] = {
262 TRANS_OPT_UPLOADPACK,
263 TRANS_OPT_RECEIVEPACK,
264 TRANS_OPT_THIN,
265 TRANS_OPT_KEEP
268 static const char *boolean_options[] = {
269 TRANS_OPT_THIN,
270 TRANS_OPT_KEEP,
271 TRANS_OPT_FOLLOWTAGS,
272 TRANS_OPT_DEEPEN_RELATIVE
275 static int strbuf_set_helper_option(struct helper_data *data,
276 struct strbuf *buf)
278 int ret;
280 sendline(data, buf);
281 if (recvline(data, buf))
282 exit(128);
284 if (!strcmp(buf->buf, "ok"))
285 ret = 0;
286 else if (starts_with(buf->buf, "error"))
287 ret = -1;
288 else if (!strcmp(buf->buf, "unsupported"))
289 ret = 1;
290 else {
291 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
292 ret = 1;
294 return ret;
297 static int string_list_set_helper_option(struct helper_data *data,
298 const char *name,
299 struct string_list *list)
301 struct strbuf buf = STRBUF_INIT;
302 int i, ret = 0;
304 for (i = 0; i < list->nr; i++) {
305 strbuf_addf(&buf, "option %s ", name);
306 quote_c_style(list->items[i].string, &buf, NULL, 0);
307 strbuf_addch(&buf, '\n');
309 if ((ret = strbuf_set_helper_option(data, &buf)))
310 break;
311 strbuf_reset(&buf);
313 strbuf_release(&buf);
314 return ret;
317 static int set_helper_option(struct transport *transport,
318 const char *name, const char *value)
320 struct helper_data *data = transport->data;
321 struct strbuf buf = STRBUF_INIT;
322 int i, ret, is_bool = 0;
324 get_helper(transport);
326 if (!data->option)
327 return 1;
329 if (!strcmp(name, "deepen-not"))
330 return string_list_set_helper_option(data, name,
331 (struct string_list *)value);
333 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
334 if (!strcmp(name, unsupported_options[i]))
335 return 1;
338 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
339 if (!strcmp(name, boolean_options[i])) {
340 is_bool = 1;
341 break;
345 strbuf_addf(&buf, "option %s ", name);
346 if (is_bool)
347 strbuf_addstr(&buf, value ? "true" : "false");
348 else
349 quote_c_style(value, &buf, NULL, 0);
350 strbuf_addch(&buf, '\n');
352 ret = strbuf_set_helper_option(data, &buf);
353 strbuf_release(&buf);
354 return ret;
357 static void standard_options(struct transport *t)
359 char buf[16];
360 int v = t->verbose;
362 set_helper_option(t, "progress", t->progress ? "true" : "false");
364 xsnprintf(buf, sizeof(buf), "%d", v + 1);
365 set_helper_option(t, "verbosity", buf);
367 switch (t->family) {
368 case TRANSPORT_FAMILY_ALL:
370 * this is already the default,
371 * do not break old remote helpers by setting "all" here
373 break;
374 case TRANSPORT_FAMILY_IPV4:
375 set_helper_option(t, "family", "ipv4");
376 break;
377 case TRANSPORT_FAMILY_IPV6:
378 set_helper_option(t, "family", "ipv6");
379 break;
383 static int release_helper(struct transport *transport)
385 int res = 0;
386 struct helper_data *data = transport->data;
387 refspec_clear(&data->rs);
388 res = disconnect_helper(transport);
389 free(transport->data);
390 return res;
393 static int fetch_with_fetch(struct transport *transport,
394 int nr_heads, struct ref **to_fetch)
396 struct helper_data *data = transport->data;
397 int i;
398 struct strbuf buf = STRBUF_INIT;
400 for (i = 0; i < nr_heads; i++) {
401 const struct ref *posn = to_fetch[i];
402 if (posn->status & REF_STATUS_UPTODATE)
403 continue;
405 strbuf_addf(&buf, "fetch %s %s\n",
406 oid_to_hex(&posn->old_oid),
407 posn->symref ? posn->symref : posn->name);
410 strbuf_addch(&buf, '\n');
411 sendline(data, &buf);
413 while (1) {
414 const char *name;
416 if (recvline(data, &buf))
417 exit(128);
419 if (skip_prefix(buf.buf, "lock ", &name)) {
420 if (transport->pack_lockfiles.nr)
421 warning(_("%s also locked %s"), data->name, name);
422 else
423 string_list_append(&transport->pack_lockfiles,
424 name);
426 else if (data->check_connectivity &&
427 data->transport_options.check_self_contained_and_connected &&
428 !strcmp(buf.buf, "connectivity-ok"))
429 data->transport_options.self_contained_and_connected = 1;
430 else if (!buf.len)
431 break;
432 else
433 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
435 strbuf_release(&buf);
437 reprepare_packed_git(the_repository);
438 return 0;
441 static int get_importer(struct transport *transport, struct child_process *fastimport)
443 struct child_process *helper = get_helper(transport);
444 struct helper_data *data = transport->data;
445 int cat_blob_fd, code;
446 child_process_init(fastimport);
447 fastimport->in = xdup(helper->out);
448 strvec_push(&fastimport->args, "fast-import");
449 strvec_push(&fastimport->args, "--allow-unsafe-features");
450 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
452 if (data->bidi_import) {
453 cat_blob_fd = xdup(helper->in);
454 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
456 fastimport->git_cmd = 1;
458 code = start_command(fastimport);
459 return code;
462 static int get_exporter(struct transport *transport,
463 struct child_process *fastexport,
464 struct string_list *revlist_args)
466 struct helper_data *data = transport->data;
467 struct child_process *helper = get_helper(transport);
468 int i;
470 child_process_init(fastexport);
472 /* we need to duplicate helper->in because we want to use it after
473 * fastexport is done with it. */
474 fastexport->out = dup(helper->in);
475 strvec_push(&fastexport->args, "fast-export");
476 strvec_push(&fastexport->args, "--use-done-feature");
477 strvec_push(&fastexport->args, data->signed_tags ?
478 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
479 if (data->export_marks)
480 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
481 if (data->import_marks)
482 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
484 for (i = 0; i < revlist_args->nr; i++)
485 strvec_push(&fastexport->args, revlist_args->items[i].string);
487 fastexport->git_cmd = 1;
488 return start_command(fastexport);
491 static int fetch_with_import(struct transport *transport,
492 int nr_heads, struct ref **to_fetch)
494 struct child_process fastimport;
495 struct helper_data *data = transport->data;
496 int i;
497 struct ref *posn;
498 struct strbuf buf = STRBUF_INIT;
500 get_helper(transport);
502 if (get_importer(transport, &fastimport))
503 die(_("couldn't run fast-import"));
505 for (i = 0; i < nr_heads; i++) {
506 posn = to_fetch[i];
507 if (posn->status & REF_STATUS_UPTODATE)
508 continue;
510 strbuf_addf(&buf, "import %s\n",
511 posn->symref ? posn->symref : posn->name);
512 sendline(data, &buf);
513 strbuf_reset(&buf);
516 write_constant(data->helper->in, "\n");
518 * remote-helpers that advertise the bidi-import capability are required to
519 * buffer the complete batch of import commands until this newline before
520 * sending data to fast-import.
521 * These helpers read back data from fast-import on their stdin, which could
522 * be mixed with import commands, otherwise.
525 if (finish_command(&fastimport))
526 die(_("error while running fast-import"));
529 * The fast-import stream of a remote helper that advertises
530 * the "refspec" capability writes to the refs named after the
531 * right hand side of the first refspec matching each ref we
532 * were fetching.
534 * (If no "refspec" capability was specified, for historical
535 * reasons we default to the equivalent of *:*.)
537 * Store the result in to_fetch[i].old_sha1. Callers such
538 * as "git fetch" can use the value to write feedback to the
539 * terminal, populate FETCH_HEAD, and determine what new value
540 * should be written to peer_ref if the update is a
541 * fast-forward or this is a forced update.
543 for (i = 0; i < nr_heads; i++) {
544 char *private, *name;
545 posn = to_fetch[i];
546 if (posn->status & REF_STATUS_UPTODATE)
547 continue;
548 name = posn->symref ? posn->symref : posn->name;
549 if (data->rs.nr)
550 private = apply_refspecs(&data->rs, name);
551 else
552 private = xstrdup(name);
553 if (private) {
554 if (read_ref(private, &posn->old_oid) < 0)
555 die(_("could not read ref %s"), private);
556 free(private);
559 strbuf_release(&buf);
560 return 0;
563 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
565 struct helper_data *data = transport->data;
566 int ret = 0;
567 int duped;
568 FILE *input;
569 struct child_process *helper;
571 helper = get_helper(transport);
574 * Yes, dup the pipe another time, as we need unbuffered version
575 * of input pipe as FILE*. fclose() closes the underlying fd and
576 * stream buffering only can be changed before first I/O operation
577 * on it.
579 duped = dup(helper->out);
580 if (duped < 0)
581 die_errno(_("can't dup helper output fd"));
582 input = xfdopen(duped, "r");
583 setvbuf(input, NULL, _IONBF, 0);
585 sendline(data, cmdbuf);
586 if (recvline_fh(input, cmdbuf))
587 exit(128);
589 if (!strcmp(cmdbuf->buf, "")) {
590 data->no_disconnect_req = 1;
591 if (debug)
592 fprintf(stderr, "Debug: Smart transport connection "
593 "ready.\n");
594 ret = 1;
595 } else if (!strcmp(cmdbuf->buf, "fallback")) {
596 if (debug)
597 fprintf(stderr, "Debug: Falling back to dumb "
598 "transport.\n");
599 } else {
600 die(_("unknown response to connect: %s"),
601 cmdbuf->buf);
604 fclose(input);
605 return ret;
608 static int process_connect_service(struct transport *transport,
609 const char *name, const char *exec)
611 struct helper_data *data = transport->data;
612 struct strbuf cmdbuf = STRBUF_INIT;
613 int ret = 0;
616 * Handle --upload-pack and friends. This is fire and forget...
617 * just warn if it fails.
619 if (strcmp(name, exec)) {
620 int r = set_helper_option(transport, "servpath", exec);
621 if (r > 0)
622 warning(_("setting remote service path not supported by protocol"));
623 else if (r < 0)
624 warning(_("invalid remote service path"));
627 if (data->connect) {
628 strbuf_addf(&cmdbuf, "connect %s\n", name);
629 ret = run_connect(transport, &cmdbuf);
630 } else if (data->stateless_connect &&
631 (get_protocol_version_config() == protocol_v2) &&
632 (!strcmp("git-upload-pack", name) ||
633 !strcmp("git-upload-archive", name))) {
634 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
635 ret = run_connect(transport, &cmdbuf);
636 if (ret)
637 transport->stateless_rpc = 1;
640 strbuf_release(&cmdbuf);
641 return ret;
644 static int process_connect(struct transport *transport,
645 int for_push)
647 struct helper_data *data = transport->data;
648 const char *name;
649 const char *exec;
650 int ret;
652 name = for_push ? "git-receive-pack" : "git-upload-pack";
653 if (for_push)
654 exec = data->transport_options.receivepack;
655 else
656 exec = data->transport_options.uploadpack;
658 ret = process_connect_service(transport, name, exec);
659 if (ret)
660 do_take_over(transport);
661 return ret;
664 static int connect_helper(struct transport *transport, const char *name,
665 const char *exec, int fd[2])
667 struct helper_data *data = transport->data;
669 /* Get_helper so connect is inited. */
670 get_helper(transport);
672 if (!process_connect_service(transport, name, exec))
673 die(_("can't connect to subservice %s"), name);
675 fd[0] = data->helper->out;
676 fd[1] = data->helper->in;
678 do_take_over(transport);
679 return 0;
682 static struct ref *get_refs_list_using_list(struct transport *transport,
683 int for_push);
685 static int fetch_refs(struct transport *transport,
686 int nr_heads, struct ref **to_fetch)
688 struct helper_data *data = transport->data;
689 int i, count;
691 get_helper(transport);
693 if (process_connect(transport, 0))
694 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
697 * If we reach here, then the server, the client, and/or the transport
698 * helper does not support protocol v2. --negotiate-only requires
699 * protocol v2.
701 if (data->transport_options.acked_commits) {
702 warning(_("--negotiate-only requires protocol v2"));
703 return -1;
706 if (!data->get_refs_list_called)
707 get_refs_list_using_list(transport, 0);
709 count = 0;
710 for (i = 0; i < nr_heads; i++)
711 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
712 count++;
714 if (!count)
715 return 0;
717 if (data->check_connectivity &&
718 data->transport_options.check_self_contained_and_connected)
719 set_helper_option(transport, "check-connectivity", "true");
721 if (transport->cloning)
722 set_helper_option(transport, "cloning", "true");
724 if (data->transport_options.update_shallow)
725 set_helper_option(transport, "update-shallow", "true");
727 if (data->transport_options.refetch)
728 set_helper_option(transport, "refetch", "true");
730 if (data->transport_options.filter_options.choice) {
731 const char *spec = expand_list_objects_filter_spec(
732 &data->transport_options.filter_options);
733 set_helper_option(transport, "filter", spec);
736 if (data->transport_options.negotiation_tips)
737 warning("Ignoring --negotiation-tip because the protocol does not support it.");
739 if (data->fetch)
740 return fetch_with_fetch(transport, nr_heads, to_fetch);
742 if (data->import)
743 return fetch_with_import(transport, nr_heads, to_fetch);
745 return -1;
748 struct push_update_ref_state {
749 struct ref *hint;
750 struct ref_push_report *report;
751 int new_report;
754 static int push_update_ref_status(struct strbuf *buf,
755 struct push_update_ref_state *state,
756 struct ref *remote_refs)
758 char *refname, *msg;
759 int status, forced = 0;
761 if (starts_with(buf->buf, "option ")) {
762 struct object_id old_oid, new_oid;
763 const char *key, *val;
764 char *p;
766 if (!state->hint || !(state->report || state->new_report))
767 die(_("'option' without a matching 'ok/error' directive"));
768 if (state->new_report) {
769 if (!state->hint->report) {
770 CALLOC_ARRAY(state->hint->report, 1);
771 state->report = state->hint->report;
772 } else {
773 state->report = state->hint->report;
774 while (state->report->next)
775 state->report = state->report->next;
776 CALLOC_ARRAY(state->report->next, 1);
777 state->report = state->report->next;
779 state->new_report = 0;
781 key = buf->buf + 7;
782 p = strchr(key, ' ');
783 if (p)
784 *p++ = '\0';
785 val = p;
786 if (!strcmp(key, "refname"))
787 state->report->ref_name = xstrdup_or_null(val);
788 else if (!strcmp(key, "old-oid") && val &&
789 !parse_oid_hex(val, &old_oid, &val))
790 state->report->old_oid = oiddup(&old_oid);
791 else if (!strcmp(key, "new-oid") && val &&
792 !parse_oid_hex(val, &new_oid, &val))
793 state->report->new_oid = oiddup(&new_oid);
794 else if (!strcmp(key, "forced-update"))
795 state->report->forced_update = 1;
796 /* Not update remote namespace again. */
797 return 1;
800 state->report = NULL;
801 state->new_report = 0;
803 if (starts_with(buf->buf, "ok ")) {
804 status = REF_STATUS_OK;
805 refname = buf->buf + 3;
806 } else if (starts_with(buf->buf, "error ")) {
807 status = REF_STATUS_REMOTE_REJECT;
808 refname = buf->buf + 6;
809 } else
810 die(_("expected ok/error, helper said '%s'"), buf->buf);
812 msg = strchr(refname, ' ');
813 if (msg) {
814 struct strbuf msg_buf = STRBUF_INIT;
815 const char *end;
817 *msg++ = '\0';
818 if (!unquote_c_style(&msg_buf, msg, &end))
819 msg = strbuf_detach(&msg_buf, NULL);
820 else
821 msg = xstrdup(msg);
822 strbuf_release(&msg_buf);
824 if (!strcmp(msg, "no match")) {
825 status = REF_STATUS_NONE;
826 FREE_AND_NULL(msg);
828 else if (!strcmp(msg, "up to date")) {
829 status = REF_STATUS_UPTODATE;
830 FREE_AND_NULL(msg);
832 else if (!strcmp(msg, "non-fast forward")) {
833 status = REF_STATUS_REJECT_NONFASTFORWARD;
834 FREE_AND_NULL(msg);
836 else if (!strcmp(msg, "already exists")) {
837 status = REF_STATUS_REJECT_ALREADY_EXISTS;
838 FREE_AND_NULL(msg);
840 else if (!strcmp(msg, "fetch first")) {
841 status = REF_STATUS_REJECT_FETCH_FIRST;
842 FREE_AND_NULL(msg);
844 else if (!strcmp(msg, "needs force")) {
845 status = REF_STATUS_REJECT_NEEDS_FORCE;
846 FREE_AND_NULL(msg);
848 else if (!strcmp(msg, "stale info")) {
849 status = REF_STATUS_REJECT_STALE;
850 FREE_AND_NULL(msg);
852 else if (!strcmp(msg, "remote ref updated since checkout")) {
853 status = REF_STATUS_REJECT_REMOTE_UPDATED;
854 FREE_AND_NULL(msg);
856 else if (!strcmp(msg, "forced update")) {
857 forced = 1;
858 FREE_AND_NULL(msg);
860 else if (!strcmp(msg, "expecting report")) {
861 status = REF_STATUS_EXPECTING_REPORT;
862 FREE_AND_NULL(msg);
866 if (state->hint)
867 state->hint = find_ref_by_name(state->hint, refname);
868 if (!state->hint)
869 state->hint = find_ref_by_name(remote_refs, refname);
870 if (!state->hint) {
871 warning(_("helper reported unexpected status of %s"), refname);
872 return 1;
875 if (state->hint->status != REF_STATUS_NONE) {
877 * Earlier, the ref was marked not to be pushed, so ignore the ref
878 * status reported by the remote helper if the latter is 'no match'.
880 if (status == REF_STATUS_NONE)
881 return 1;
884 if (status == REF_STATUS_OK)
885 state->new_report = 1;
886 state->hint->status = status;
887 state->hint->forced_update |= forced;
888 state->hint->remote_status = msg;
889 return !(status == REF_STATUS_OK);
892 static int push_update_refs_status(struct helper_data *data,
893 struct ref *remote_refs,
894 int flags)
896 struct ref *ref;
897 struct ref_push_report *report;
898 struct strbuf buf = STRBUF_INIT;
899 struct push_update_ref_state state = { remote_refs, NULL, 0 };
901 for (;;) {
902 if (recvline(data, &buf)) {
903 strbuf_release(&buf);
904 return 1;
906 if (!buf.len)
907 break;
908 push_update_ref_status(&buf, &state, remote_refs);
910 strbuf_release(&buf);
912 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
913 return 0;
915 /* propagate back the update to the remote namespace */
916 for (ref = remote_refs; ref; ref = ref->next) {
917 char *private;
919 if (ref->status != REF_STATUS_OK)
920 continue;
922 if (!ref->report) {
923 private = apply_refspecs(&data->rs, ref->name);
924 if (!private)
925 continue;
926 update_ref("update by helper", private, &(ref->new_oid),
927 NULL, 0, 0);
928 free(private);
929 } else {
930 for (report = ref->report; report; report = report->next) {
931 private = apply_refspecs(&data->rs,
932 report->ref_name
933 ? report->ref_name
934 : ref->name);
935 if (!private)
936 continue;
937 update_ref("update by helper", private,
938 report->new_oid
939 ? report->new_oid
940 : &(ref->new_oid),
941 NULL, 0, 0);
942 free(private);
946 return 0;
949 static void set_common_push_options(struct transport *transport,
950 const char *name, int flags)
952 if (flags & TRANSPORT_PUSH_DRY_RUN) {
953 if (set_helper_option(transport, "dry-run", "true") != 0)
954 die(_("helper %s does not support dry-run"), name);
955 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
956 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
957 die(_("helper %s does not support --signed"), name);
958 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
959 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
960 die(_("helper %s does not support --signed=if-asked"), name);
963 if (flags & TRANSPORT_PUSH_ATOMIC)
964 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
965 die(_("helper %s does not support --atomic"), name);
967 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
968 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
969 die(_("helper %s does not support --%s"),
970 name, TRANS_OPT_FORCE_IF_INCLUDES);
972 if (flags & TRANSPORT_PUSH_OPTIONS) {
973 struct string_list_item *item;
974 for_each_string_list_item(item, transport->push_options)
975 if (set_helper_option(transport, "push-option", item->string) != 0)
976 die(_("helper %s does not support 'push-option'"), name);
980 static int push_refs_with_push(struct transport *transport,
981 struct ref *remote_refs, int flags)
983 int force_all = flags & TRANSPORT_PUSH_FORCE;
984 int mirror = flags & TRANSPORT_PUSH_MIRROR;
985 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
986 struct helper_data *data = transport->data;
987 struct strbuf buf = STRBUF_INIT;
988 struct ref *ref;
989 struct string_list cas_options = STRING_LIST_INIT_DUP;
990 struct string_list_item *cas_option;
992 get_helper(transport);
993 if (!data->push)
994 return 1;
996 for (ref = remote_refs; ref; ref = ref->next) {
997 if (!ref->peer_ref && !mirror)
998 continue;
1000 /* Check for statuses set by set_ref_status_for_push() */
1001 switch (ref->status) {
1002 case REF_STATUS_REJECT_NONFASTFORWARD:
1003 case REF_STATUS_REJECT_STALE:
1004 case REF_STATUS_REJECT_ALREADY_EXISTS:
1005 case REF_STATUS_REJECT_REMOTE_UPDATED:
1006 if (atomic) {
1007 reject_atomic_push(remote_refs, mirror);
1008 string_list_clear(&cas_options, 0);
1009 return 0;
1010 } else
1011 continue;
1012 case REF_STATUS_UPTODATE:
1013 continue;
1014 default:
1015 ; /* do nothing */
1018 if (force_all)
1019 ref->force = 1;
1021 strbuf_addstr(&buf, "push ");
1022 if (!ref->deletion) {
1023 if (ref->force)
1024 strbuf_addch(&buf, '+');
1025 if (ref->peer_ref)
1026 strbuf_addstr(&buf, ref->peer_ref->name);
1027 else
1028 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1030 strbuf_addch(&buf, ':');
1031 strbuf_addstr(&buf, ref->name);
1032 strbuf_addch(&buf, '\n');
1035 * The "--force-with-lease" options without explicit
1036 * values to expect have already been expanded into
1037 * the ref->old_oid_expect[] field; we can ignore
1038 * transport->smart_options->cas altogether and instead
1039 * can enumerate them from the refs.
1041 if (ref->expect_old_sha1) {
1042 struct strbuf cas = STRBUF_INIT;
1043 strbuf_addf(&cas, "%s:%s",
1044 ref->name, oid_to_hex(&ref->old_oid_expect));
1045 string_list_append_nodup(&cas_options,
1046 strbuf_detach(&cas, NULL));
1049 if (buf.len == 0) {
1050 string_list_clear(&cas_options, 0);
1051 return 0;
1054 for_each_string_list_item(cas_option, &cas_options)
1055 set_helper_option(transport, "cas", cas_option->string);
1056 set_common_push_options(transport, data->name, flags);
1058 strbuf_addch(&buf, '\n');
1059 sendline(data, &buf);
1060 strbuf_release(&buf);
1061 string_list_clear(&cas_options, 0);
1063 return push_update_refs_status(data, remote_refs, flags);
1066 static int push_refs_with_export(struct transport *transport,
1067 struct ref *remote_refs, int flags)
1069 struct ref *ref;
1070 struct child_process *helper, exporter;
1071 struct helper_data *data = transport->data;
1072 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1073 struct strbuf buf = STRBUF_INIT;
1075 if (!data->rs.nr)
1076 die(_("remote-helper doesn't support push; refspec needed"));
1078 set_common_push_options(transport, data->name, flags);
1079 if (flags & TRANSPORT_PUSH_FORCE) {
1080 if (set_helper_option(transport, "force", "true") != 0)
1081 warning(_("helper %s does not support '--force'"), data->name);
1084 helper = get_helper(transport);
1086 write_constant(helper->in, "export\n");
1088 for (ref = remote_refs; ref; ref = ref->next) {
1089 char *private;
1090 struct object_id oid;
1092 private = apply_refspecs(&data->rs, ref->name);
1093 if (private && !repo_get_oid(the_repository, private, &oid)) {
1094 strbuf_addf(&buf, "^%s", private);
1095 string_list_append_nodup(&revlist_args,
1096 strbuf_detach(&buf, NULL));
1097 oidcpy(&ref->old_oid, &oid);
1099 free(private);
1101 if (ref->peer_ref) {
1102 if (strcmp(ref->name, ref->peer_ref->name)) {
1103 if (!ref->deletion) {
1104 const char *name;
1105 int flag;
1107 /* Follow symbolic refs (mainly for HEAD). */
1108 name = resolve_ref_unsafe(ref->peer_ref->name,
1109 RESOLVE_REF_READING,
1110 &oid, &flag);
1111 if (!name || !(flag & REF_ISSYMREF))
1112 name = ref->peer_ref->name;
1114 strbuf_addf(&buf, "%s:%s", name, ref->name);
1115 } else
1116 strbuf_addf(&buf, ":%s", ref->name);
1118 string_list_append(&revlist_args, "--refspec");
1119 string_list_append(&revlist_args, buf.buf);
1120 strbuf_release(&buf);
1122 if (!ref->deletion)
1123 string_list_append(&revlist_args, ref->peer_ref->name);
1127 if (get_exporter(transport, &exporter, &revlist_args))
1128 die(_("couldn't run fast-export"));
1130 string_list_clear(&revlist_args, 1);
1132 if (finish_command(&exporter))
1133 die(_("error while running fast-export"));
1134 if (push_update_refs_status(data, remote_refs, flags))
1135 return 1;
1137 if (data->export_marks) {
1138 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1139 rename(buf.buf, data->export_marks);
1140 strbuf_release(&buf);
1143 return 0;
1146 static int push_refs(struct transport *transport,
1147 struct ref *remote_refs, int flags)
1149 struct helper_data *data = transport->data;
1151 if (process_connect(transport, 1))
1152 return transport->vtable->push_refs(transport, remote_refs, flags);
1154 if (!remote_refs) {
1155 fprintf(stderr,
1156 _("No refs in common and none specified; doing nothing.\n"
1157 "Perhaps you should specify a branch.\n"));
1158 return 0;
1161 if (data->push)
1162 return push_refs_with_push(transport, remote_refs, flags);
1164 if (data->export)
1165 return push_refs_with_export(transport, remote_refs, flags);
1167 return -1;
1171 static int has_attribute(const char *attrs, const char *attr)
1173 int len;
1174 if (!attrs)
1175 return 0;
1177 len = strlen(attr);
1178 for (;;) {
1179 const char *space = strchrnul(attrs, ' ');
1180 if (len == space - attrs && !strncmp(attrs, attr, len))
1181 return 1;
1182 if (!*space)
1183 return 0;
1184 attrs = space + 1;
1188 static struct ref *get_refs_list(struct transport *transport, int for_push,
1189 struct transport_ls_refs_options *transport_options)
1191 get_helper(transport);
1193 if (process_connect(transport, for_push))
1194 return transport->vtable->get_refs_list(transport, for_push,
1195 transport_options);
1197 return get_refs_list_using_list(transport, for_push);
1200 static struct ref *get_refs_list_using_list(struct transport *transport,
1201 int for_push)
1203 struct helper_data *data = transport->data;
1204 struct child_process *helper;
1205 struct ref *ret = NULL;
1206 struct ref **tail = &ret;
1207 struct ref *posn;
1208 struct strbuf buf = STRBUF_INIT;
1210 data->get_refs_list_called = 1;
1211 helper = get_helper(transport);
1213 if (data->object_format)
1214 set_helper_option(transport, "object-format", "true");
1216 if (data->push && for_push)
1217 write_constant(helper->in, "list for-push\n");
1218 else
1219 write_constant(helper->in, "list\n");
1221 while (1) {
1222 char *eov, *eon;
1223 if (recvline(data, &buf))
1224 exit(128);
1226 if (!*buf.buf)
1227 break;
1228 else if (buf.buf[0] == ':') {
1229 const char *value;
1230 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1231 int algo = hash_algo_by_name(value);
1232 if (algo == GIT_HASH_UNKNOWN)
1233 die(_("unsupported object format '%s'"),
1234 value);
1235 transport->hash_algo = &hash_algos[algo];
1237 continue;
1240 eov = strchr(buf.buf, ' ');
1241 if (!eov)
1242 die(_("malformed response in ref list: %s"), buf.buf);
1243 eon = strchr(eov + 1, ' ');
1244 *eov = '\0';
1245 if (eon)
1246 *eon = '\0';
1247 *tail = alloc_ref(eov + 1);
1248 if (buf.buf[0] == '@')
1249 (*tail)->symref = xstrdup(buf.buf + 1);
1250 else if (buf.buf[0] != '?')
1251 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1252 if (eon) {
1253 if (has_attribute(eon + 1, "unchanged")) {
1254 (*tail)->status |= REF_STATUS_UPTODATE;
1255 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
1256 die(_("could not read ref %s"),
1257 (*tail)->name);
1260 tail = &((*tail)->next);
1262 if (debug)
1263 fprintf(stderr, "Debug: Read ref listing.\n");
1264 strbuf_release(&buf);
1266 for (posn = ret; posn; posn = posn->next)
1267 resolve_remote_symref(posn, ret);
1269 return ret;
1272 static int get_bundle_uri(struct transport *transport)
1274 get_helper(transport);
1276 if (process_connect(transport, 0))
1277 return transport->vtable->get_bundle_uri(transport);
1279 return -1;
1282 static struct transport_vtable vtable = {
1283 .set_option = set_helper_option,
1284 .get_refs_list = get_refs_list,
1285 .get_bundle_uri = get_bundle_uri,
1286 .fetch_refs = fetch_refs,
1287 .push_refs = push_refs,
1288 .connect = connect_helper,
1289 .disconnect = release_helper
1292 int transport_helper_init(struct transport *transport, const char *name)
1294 struct helper_data *data = xcalloc(1, sizeof(*data));
1295 data->name = name;
1297 transport_check_allowed(name);
1299 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1300 debug = 1;
1302 list_objects_filter_init(&data->transport_options.filter_options);
1304 transport->data = data;
1305 transport->vtable = &vtable;
1306 transport->smart_options = &(data->transport_options);
1307 return 0;
1311 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1312 * buffer less), so attempt reads and writes with up to that size.
1314 #define BUFFERSIZE 65536
1315 /* This should be enough to hold debugging message. */
1316 #define PBUFFERSIZE 8192
1318 /* Print bidirectional transfer loop debug message. */
1319 __attribute__((format (printf, 1, 2)))
1320 static void transfer_debug(const char *fmt, ...)
1323 * NEEDSWORK: This function is sometimes used from multiple threads, and
1324 * we end up using debug_enabled racily. That "should not matter" since
1325 * we always write the same value, but it's still wrong. This function
1326 * is listed in .tsan-suppressions for the time being.
1329 va_list args;
1330 char msgbuf[PBUFFERSIZE];
1331 static int debug_enabled = -1;
1333 if (debug_enabled < 0)
1334 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1335 if (!debug_enabled)
1336 return;
1338 va_start(args, fmt);
1339 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1340 va_end(args);
1341 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1344 /* Stream state: More data may be coming in this direction. */
1345 #define SSTATE_TRANSFERRING 0
1347 * Stream state: No more data coming in this direction, flushing rest of
1348 * data.
1350 #define SSTATE_FLUSHING 1
1351 /* Stream state: Transfer in this direction finished. */
1352 #define SSTATE_FINISHED 2
1354 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1355 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1356 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1358 /* Unidirectional transfer. */
1359 struct unidirectional_transfer {
1360 /* Source */
1361 int src;
1362 /* Destination */
1363 int dest;
1364 /* Is source socket? */
1365 int src_is_sock;
1366 /* Is destination socket? */
1367 int dest_is_sock;
1368 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1369 int state;
1370 /* Buffer. */
1371 char buf[BUFFERSIZE];
1372 /* Buffer used. */
1373 size_t bufuse;
1374 /* Name of source. */
1375 const char *src_name;
1376 /* Name of destination. */
1377 const char *dest_name;
1380 /* Closes the target (for writing) if transfer has finished. */
1381 static void udt_close_if_finished(struct unidirectional_transfer *t)
1383 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1384 t->state = SSTATE_FINISHED;
1385 if (t->dest_is_sock)
1386 shutdown(t->dest, SHUT_WR);
1387 else
1388 close(t->dest);
1389 transfer_debug("Closed %s.", t->dest_name);
1394 * Tries to read data from source into buffer. If buffer is full,
1395 * no data is read. Returns 0 on success, -1 on error.
1397 static int udt_do_read(struct unidirectional_transfer *t)
1399 ssize_t bytes;
1401 if (t->bufuse == BUFFERSIZE)
1402 return 0; /* No space for more. */
1404 transfer_debug("%s is readable", t->src_name);
1405 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1406 if (bytes < 0) {
1407 error_errno(_("read(%s) failed"), t->src_name);
1408 return -1;
1409 } else if (bytes == 0) {
1410 transfer_debug("%s EOF (with %i bytes in buffer)",
1411 t->src_name, (int)t->bufuse);
1412 t->state = SSTATE_FLUSHING;
1413 } else if (bytes > 0) {
1414 t->bufuse += bytes;
1415 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1416 (int)bytes, t->src_name, (int)t->bufuse);
1418 return 0;
1421 /* Tries to write data from buffer into destination. If buffer is empty,
1422 * no data is written. Returns 0 on success, -1 on error.
1424 static int udt_do_write(struct unidirectional_transfer *t)
1426 ssize_t bytes;
1428 if (t->bufuse == 0)
1429 return 0; /* Nothing to write. */
1431 transfer_debug("%s is writable", t->dest_name);
1432 bytes = xwrite(t->dest, t->buf, t->bufuse);
1433 if (bytes < 0) {
1434 error_errno(_("write(%s) failed"), t->dest_name);
1435 return -1;
1436 } else if (bytes > 0) {
1437 t->bufuse -= bytes;
1438 if (t->bufuse)
1439 memmove(t->buf, t->buf + bytes, t->bufuse);
1440 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1441 (int)bytes, t->dest_name, (int)t->bufuse);
1443 return 0;
1447 /* State of bidirectional transfer loop. */
1448 struct bidirectional_transfer_state {
1449 /* Direction from program to git. */
1450 struct unidirectional_transfer ptg;
1451 /* Direction from git to program. */
1452 struct unidirectional_transfer gtp;
1455 static void *udt_copy_task_routine(void *udt)
1457 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1458 while (t->state != SSTATE_FINISHED) {
1459 if (STATE_NEEDS_READING(t->state))
1460 if (udt_do_read(t))
1461 return NULL;
1462 if (STATE_NEEDS_WRITING(t->state))
1463 if (udt_do_write(t))
1464 return NULL;
1465 if (STATE_NEEDS_CLOSING(t->state))
1466 udt_close_if_finished(t);
1468 return udt; /* Just some non-NULL value. */
1471 #ifndef NO_PTHREADS
1474 * Join thread, with appropriate errors on failure. Name is name for the
1475 * thread (for error messages). Returns 0 on success, 1 on failure.
1477 static int tloop_join(pthread_t thread, const char *name)
1479 int err;
1480 void *tret;
1481 err = pthread_join(thread, &tret);
1482 if (!tret) {
1483 error(_("%s thread failed"), name);
1484 return 1;
1486 if (err) {
1487 error(_("%s thread failed to join: %s"), name, strerror(err));
1488 return 1;
1490 return 0;
1494 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1495 * -1 on failure.
1497 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1499 pthread_t gtp_thread;
1500 pthread_t ptg_thread;
1501 int err;
1502 int ret = 0;
1503 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1504 &s->gtp);
1505 if (err)
1506 die(_("can't start thread for copying data: %s"), strerror(err));
1507 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1508 &s->ptg);
1509 if (err)
1510 die(_("can't start thread for copying data: %s"), strerror(err));
1512 ret |= tloop_join(gtp_thread, "Git to program copy");
1513 ret |= tloop_join(ptg_thread, "Program to git copy");
1514 return ret;
1516 #else
1518 /* Close the source and target (for writing) for transfer. */
1519 static void udt_kill_transfer(struct unidirectional_transfer *t)
1521 t->state = SSTATE_FINISHED;
1523 * Socket read end left open isn't a disaster if nobody
1524 * attempts to read from it (mingw compat headers do not
1525 * have SHUT_RD)...
1527 * We can't fully close the socket since otherwise gtp
1528 * task would first close the socket it sends data to
1529 * while closing the ptg file descriptors.
1531 if (!t->src_is_sock)
1532 close(t->src);
1533 if (t->dest_is_sock)
1534 shutdown(t->dest, SHUT_WR);
1535 else
1536 close(t->dest);
1540 * Join process, with appropriate errors on failure. Name is name for the
1541 * process (for error messages). Returns 0 on success, 1 on failure.
1543 static int tloop_join(pid_t pid, const char *name)
1545 int tret;
1546 if (waitpid(pid, &tret, 0) < 0) {
1547 error_errno(_("%s process failed to wait"), name);
1548 return 1;
1550 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1551 error(_("%s process failed"), name);
1552 return 1;
1554 return 0;
1558 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1559 * -1 on failure.
1561 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1563 pid_t pid1, pid2;
1564 int ret = 0;
1566 /* Fork thread #1: git to program. */
1567 pid1 = fork();
1568 if (pid1 < 0)
1569 die_errno(_("can't start thread for copying data"));
1570 else if (pid1 == 0) {
1571 udt_kill_transfer(&s->ptg);
1572 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1575 /* Fork thread #2: program to git. */
1576 pid2 = fork();
1577 if (pid2 < 0)
1578 die_errno(_("can't start thread for copying data"));
1579 else if (pid2 == 0) {
1580 udt_kill_transfer(&s->gtp);
1581 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1585 * Close both streams in parent as to not interfere with
1586 * end of file detection and wait for both tasks to finish.
1588 udt_kill_transfer(&s->gtp);
1589 udt_kill_transfer(&s->ptg);
1590 ret |= tloop_join(pid1, "Git to program copy");
1591 ret |= tloop_join(pid2, "Program to git copy");
1592 return ret;
1594 #endif
1597 * Copies data from stdin to output and from input to stdout simultaneously.
1598 * Additionally filtering through given filter. If filter is NULL, uses
1599 * identity filter.
1601 int bidirectional_transfer_loop(int input, int output)
1603 struct bidirectional_transfer_state state;
1605 /* Fill the state fields. */
1606 state.ptg.src = input;
1607 state.ptg.dest = 1;
1608 state.ptg.src_is_sock = (input == output);
1609 state.ptg.dest_is_sock = 0;
1610 state.ptg.state = SSTATE_TRANSFERRING;
1611 state.ptg.bufuse = 0;
1612 state.ptg.src_name = "remote input";
1613 state.ptg.dest_name = "stdout";
1615 state.gtp.src = 0;
1616 state.gtp.dest = output;
1617 state.gtp.src_is_sock = 0;
1618 state.gtp.dest_is_sock = (input == output);
1619 state.gtp.state = SSTATE_TRANSFERRING;
1620 state.gtp.bufuse = 0;
1621 state.gtp.src_name = "stdin";
1622 state.gtp.dest_name = "remote output";
1624 return tloop_spawnwait_tasks(&state);
1627 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1629 struct ref *ref;
1631 /* Mark other refs as failed */
1632 for (ref = remote_refs; ref; ref = ref->next) {
1633 if (!ref->peer_ref && !mirror_mode)
1634 continue;
1636 switch (ref->status) {
1637 case REF_STATUS_NONE:
1638 case REF_STATUS_OK:
1639 case REF_STATUS_EXPECTING_REPORT:
1640 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1641 continue;
1642 default:
1643 break; /* do nothing */
1646 return;