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debian: new upstream release
[git/debian.git] / transport-helper.c
blob49811ef176dbc5af5e33fe47cf93cf1f57719f5e
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 "diff.h"
7 #include "environment.h"
8 #include "gettext.h"
9 #include "hex.h"
10 #include "object-name.h"
11 #include "repository.h"
12 #include "revision.h"
13 #include "remote.h"
14 #include "string-list.h"
15 #include "thread-utils.h"
16 #include "sigchain.h"
17 #include "strvec.h"
18 #include "refs.h"
19 #include "refspec.h"
20 #include "transport-internal.h"
21 #include "protocol.h"
22
23 static int debug;
24
25 struct helper_data {
26 const char *name;
27 struct child_process *helper;
28 FILE *out;
29 unsigned fetch : 1,
30 import : 1,
31 bidi_import : 1,
32 export : 1,
33 option : 1,
34 push : 1,
35 connect : 1,
36 stateless_connect : 1,
37 signed_tags : 1,
38 check_connectivity : 1,
39 no_disconnect_req : 1,
40 no_private_update : 1,
41 object_format : 1;
42
43 /*
44 * As an optimization, the transport code may invoke fetch before
45 * get_refs_list. If this happens, and if the transport helper doesn't
46 * support connect or stateless_connect, we need to invoke
47 * get_refs_list ourselves if we haven't already done so. Keep track of
48 * whether we have invoked get_refs_list.
49 */
50 unsigned get_refs_list_called : 1;
51
52 char *export_marks;
53 char *import_marks;
54 /* These go from remote name (as in "list") to private name */
55 struct refspec rs;
56 /* Transport options for fetch-pack/send-pack (should one of
57 * those be invoked).
58 */
59 struct git_transport_options transport_options;
60 };
61
62 static void sendline(struct helper_data *helper, struct strbuf *buffer)
63 {
64 if (debug)
65 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
66 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
67 die_errno(_("full write to remote helper failed"));
68 }
69
70 static int recvline_fh(FILE *helper, struct strbuf *buffer)
71 {
72 strbuf_reset(buffer);
73 if (debug)
74 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
75 if (strbuf_getline(buffer, helper) == EOF) {
76 if (debug)
77 fprintf(stderr, "Debug: Remote helper quit.\n");
78 return 1;
79 }
80
81 if (debug)
82 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
83 return 0;
84 }
85
86 static int recvline(struct helper_data *helper, struct strbuf *buffer)
87 {
88 return recvline_fh(helper->out, buffer);
89 }
90
91 static void write_constant(int fd, const char *str)
92 {
93 if (debug)
94 fprintf(stderr, "Debug: Remote helper: -> %s", str);
95 if (write_in_full(fd, str, strlen(str)) < 0)
96 die_errno(_("full write to remote helper failed"));
97 }
98
99 static const char *remove_ext_force(const char *url)
100 {
101 if (url) {
102 const char *colon = strchr(url, ':');
103 if (colon && colon[1] == ':')
104 return colon + 2;
105 }
106 return url;
107 }
108
109 static void do_take_over(struct transport *transport)
110 {
111 struct helper_data *data;
112 data = (struct helper_data *)transport->data;
113 transport_take_over(transport, data->helper);
114 fclose(data->out);
115 free(data);
116 }
117
118 static void standard_options(struct transport *t);
119
120 static struct child_process *get_helper(struct transport *transport)
121 {
122 struct helper_data *data = transport->data;
123 struct strbuf buf = STRBUF_INIT;
124 struct child_process *helper;
125 int duped;
126 int code;
127
128 if (data->helper)
129 return data->helper;
130
131 helper = xmalloc(sizeof(*helper));
132 child_process_init(helper);
133 helper->in = -1;
134 helper->out = -1;
135 helper->err = 0;
136 strvec_pushf(&helper->args, "remote-%s", data->name);
137 strvec_push(&helper->args, transport->remote->name);
138 strvec_push(&helper->args, remove_ext_force(transport->url));
139 helper->git_cmd = 1;
140 helper->silent_exec_failure = 1;
141
142 if (have_git_dir())
143 strvec_pushf(&helper->env, "%s=%s",
144 GIT_DIR_ENVIRONMENT, get_git_dir());
145
146 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
147
148 code = start_command(helper);
149 if (code < 0 && errno == ENOENT)
150 die(_("unable to find remote helper for '%s'"), data->name);
151 else if (code != 0)
152 exit(code);
153
154 data->helper = helper;
155 data->no_disconnect_req = 0;
156 refspec_init(&data->rs, REFSPEC_FETCH);
157
158 /*
159 * Open the output as FILE* so strbuf_getline_*() family of
160 * functions can be used.
161 * Do this with duped fd because fclose() will close the fd,
162 * and stuff like taking over will require the fd to remain.
163 */
164 duped = dup(helper->out);
165 if (duped < 0)
166 die_errno(_("can't dup helper output fd"));
167 data->out = xfdopen(duped, "r");
168
169 write_constant(helper->in, "capabilities\n");
170
171 while (1) {
172 const char *capname, *arg;
173 int mandatory = 0;
174 if (recvline(data, &buf))
175 exit(128);
176
177 if (!*buf.buf)
178 break;
179
180 if (*buf.buf == '*') {
181 capname = buf.buf + 1;
182 mandatory = 1;
183 } else
184 capname = buf.buf;
185
186 if (debug)
187 fprintf(stderr, "Debug: Got cap %s\n", capname);
188 if (!strcmp(capname, "fetch"))
189 data->fetch = 1;
190 else if (!strcmp(capname, "option"))
191 data->option = 1;
192 else if (!strcmp(capname, "push"))
193 data->push = 1;
194 else if (!strcmp(capname, "import"))
195 data->import = 1;
196 else if (!strcmp(capname, "bidi-import"))
197 data->bidi_import = 1;
198 else if (!strcmp(capname, "export"))
199 data->export = 1;
200 else if (!strcmp(capname, "check-connectivity"))
201 data->check_connectivity = 1;
202 else if (skip_prefix(capname, "refspec ", &arg)) {
203 refspec_append(&data->rs, arg);
204 } else if (!strcmp(capname, "connect")) {
205 data->connect = 1;
206 } else if (!strcmp(capname, "stateless-connect")) {
207 data->stateless_connect = 1;
208 } else if (!strcmp(capname, "signed-tags")) {
209 data->signed_tags = 1;
210 } else if (skip_prefix(capname, "export-marks ", &arg)) {
211 data->export_marks = xstrdup(arg);
212 } else if (skip_prefix(capname, "import-marks ", &arg)) {
213 data->import_marks = xstrdup(arg);
214 } else if (starts_with(capname, "no-private-update")) {
215 data->no_private_update = 1;
216 } else if (starts_with(capname, "object-format")) {
217 data->object_format = 1;
218 } else if (mandatory) {
219 die(_("unknown mandatory capability %s; this remote "
220 "helper probably needs newer version of Git"),
221 capname);
222 }
223 }
224 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
225 warning(_("this remote helper should implement refspec capability"));
226 }
227 strbuf_release(&buf);
228 if (debug)
229 fprintf(stderr, "Debug: Capabilities complete.\n");
230 standard_options(transport);
231 return data->helper;
232 }
233
234 static int disconnect_helper(struct transport *transport)
235 {
236 struct helper_data *data = transport->data;
237 int res = 0;
238
239 if (data->helper) {
240 if (debug)
241 fprintf(stderr, "Debug: Disconnecting.\n");
242 if (!data->no_disconnect_req) {
243 /*
244 * Ignore write errors; there's nothing we can do,
245 * since we're about to close the pipe anyway. And the
246 * most likely error is EPIPE due to the helper dying
247 * to report an error itself.
248 */
249 sigchain_push(SIGPIPE, SIG_IGN);
250 xwrite(data->helper->in, "\n", 1);
251 sigchain_pop(SIGPIPE);
252 }
253 close(data->helper->in);
254 close(data->helper->out);
255 fclose(data->out);
256 res = finish_command(data->helper);
257 FREE_AND_NULL(data->helper);
258 }
259 return res;
260 }
261
262 static const char *unsupported_options[] = {
263 TRANS_OPT_UPLOADPACK,
264 TRANS_OPT_RECEIVEPACK,
265 TRANS_OPT_THIN,
266 TRANS_OPT_KEEP
267 };
268
269 static const char *boolean_options[] = {
270 TRANS_OPT_THIN,
271 TRANS_OPT_KEEP,
272 TRANS_OPT_FOLLOWTAGS,
273 TRANS_OPT_DEEPEN_RELATIVE
274 };
275
276 static int strbuf_set_helper_option(struct helper_data *data,
277 struct strbuf *buf)
278 {
279 int ret;
280
281 sendline(data, buf);
282 if (recvline(data, buf))
283 exit(128);
284
285 if (!strcmp(buf->buf, "ok"))
286 ret = 0;
287 else if (starts_with(buf->buf, "error"))
288 ret = -1;
289 else if (!strcmp(buf->buf, "unsupported"))
290 ret = 1;
291 else {
292 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
293 ret = 1;
294 }
295 return ret;
296 }
297
298 static int string_list_set_helper_option(struct helper_data *data,
299 const char *name,
300 struct string_list *list)
301 {
302 struct strbuf buf = STRBUF_INIT;
303 int i, ret = 0;
304
305 for (i = 0; i < list->nr; i++) {
306 strbuf_addf(&buf, "option %s ", name);
307 quote_c_style(list->items[i].string, &buf, NULL, 0);
308 strbuf_addch(&buf, '\n');
309
310 if ((ret = strbuf_set_helper_option(data, &buf)))
311 break;
312 strbuf_reset(&buf);
313 }
314 strbuf_release(&buf);
315 return ret;
316 }
317
318 static int set_helper_option(struct transport *transport,
319 const char *name, const char *value)
320 {
321 struct helper_data *data = transport->data;
322 struct strbuf buf = STRBUF_INIT;
323 int i, ret, is_bool = 0;
324
325 get_helper(transport);
326
327 if (!data->option)
328 return 1;
329
330 if (!strcmp(name, "deepen-not"))
331 return string_list_set_helper_option(data, name,
332 (struct string_list *)value);
333
334 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
335 if (!strcmp(name, unsupported_options[i]))
336 return 1;
337 }
338
339 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
340 if (!strcmp(name, boolean_options[i])) {
341 is_bool = 1;
342 break;
343 }
344 }
345
346 strbuf_addf(&buf, "option %s ", name);
347 if (is_bool)
348 strbuf_addstr(&buf, value ? "true" : "false");
349 else
350 quote_c_style(value, &buf, NULL, 0);
351 strbuf_addch(&buf, '\n');
352
353 ret = strbuf_set_helper_option(data, &buf);
354 strbuf_release(&buf);
355 return ret;
356 }
357
358 static void standard_options(struct transport *t)
359 {
360 char buf[16];
361 int v = t->verbose;
362
363 set_helper_option(t, "progress", t->progress ? "true" : "false");
364
365 xsnprintf(buf, sizeof(buf), "%d", v + 1);
366 set_helper_option(t, "verbosity", buf);
367
368 switch (t->family) {
369 case TRANSPORT_FAMILY_ALL:
370 /*
371 * this is already the default,
372 * do not break old remote helpers by setting "all" here
373 */
374 break;
375 case TRANSPORT_FAMILY_IPV4:
376 set_helper_option(t, "family", "ipv4");
377 break;
378 case TRANSPORT_FAMILY_IPV6:
379 set_helper_option(t, "family", "ipv6");
380 break;
381 }
382 }
383
384 static int release_helper(struct transport *transport)
385 {
386 int res = 0;
387 struct helper_data *data = transport->data;
388 refspec_clear(&data->rs);
389 res = disconnect_helper(transport);
390 free(transport->data);
391 return res;
392 }
393
394 static int fetch_with_fetch(struct transport *transport,
395 int nr_heads, struct ref **to_fetch)
396 {
397 struct helper_data *data = transport->data;
398 int i;
399 struct strbuf buf = STRBUF_INIT;
400
401 for (i = 0; i < nr_heads; i++) {
402 const struct ref *posn = to_fetch[i];
403 if (posn->status & REF_STATUS_UPTODATE)
404 continue;
405
406 strbuf_addf(&buf, "fetch %s %s\n",
407 oid_to_hex(&posn->old_oid),
408 posn->symref ? posn->symref : posn->name);
409 }
410
411 strbuf_addch(&buf, '\n');
412 sendline(data, &buf);
413
414 while (1) {
415 const char *name;
416
417 if (recvline(data, &buf))
418 exit(128);
419
420 if (skip_prefix(buf.buf, "lock ", &name)) {
421 if (transport->pack_lockfiles.nr)
422 warning(_("%s also locked %s"), data->name, name);
423 else
424 string_list_append(&transport->pack_lockfiles,
425 name);
426 }
427 else if (data->check_connectivity &&
428 data->transport_options.check_self_contained_and_connected &&
429 !strcmp(buf.buf, "connectivity-ok"))
430 data->transport_options.self_contained_and_connected = 1;
431 else if (!buf.len)
432 break;
433 else
434 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
435 }
436 strbuf_release(&buf);
437 return 0;
438 }
439
440 static int get_importer(struct transport *transport, struct child_process *fastimport)
441 {
442 struct child_process *helper = get_helper(transport);
443 struct helper_data *data = transport->data;
444 int cat_blob_fd, code;
445 child_process_init(fastimport);
446 fastimport->in = xdup(helper->out);
447 strvec_push(&fastimport->args, "fast-import");
448 strvec_push(&fastimport->args, "--allow-unsafe-features");
449 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
450
451 if (data->bidi_import) {
452 cat_blob_fd = xdup(helper->in);
453 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
454 }
455 fastimport->git_cmd = 1;
456
457 code = start_command(fastimport);
458 return code;
459 }
460
461 static int get_exporter(struct transport *transport,
462 struct child_process *fastexport,
463 struct string_list *revlist_args)
464 {
465 struct helper_data *data = transport->data;
466 struct child_process *helper = get_helper(transport);
467 int i;
468
469 child_process_init(fastexport);
470
471 /* we need to duplicate helper->in because we want to use it after
472 * fastexport is done with it. */
473 fastexport->out = dup(helper->in);
474 strvec_push(&fastexport->args, "fast-export");
475 strvec_push(&fastexport->args, "--use-done-feature");
476 strvec_push(&fastexport->args, data->signed_tags ?
477 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
478 if (data->export_marks)
479 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
480 if (data->import_marks)
481 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
482
483 for (i = 0; i < revlist_args->nr; i++)
484 strvec_push(&fastexport->args, revlist_args->items[i].string);
485
486 fastexport->git_cmd = 1;
487 return start_command(fastexport);
488 }
489
490 static int fetch_with_import(struct transport *transport,
491 int nr_heads, struct ref **to_fetch)
492 {
493 struct child_process fastimport;
494 struct helper_data *data = transport->data;
495 int i;
496 struct ref *posn;
497 struct strbuf buf = STRBUF_INIT;
498
499 get_helper(transport);
500
501 if (get_importer(transport, &fastimport))
502 die(_("couldn't run fast-import"));
503
504 for (i = 0; i < nr_heads; i++) {
505 posn = to_fetch[i];
506 if (posn->status & REF_STATUS_UPTODATE)
507 continue;
508
509 strbuf_addf(&buf, "import %s\n",
510 posn->symref ? posn->symref : posn->name);
511 sendline(data, &buf);
512 strbuf_reset(&buf);
513 }
514
515 write_constant(data->helper->in, "\n");
516 /*
517 * remote-helpers that advertise the bidi-import capability are required to
518 * buffer the complete batch of import commands until this newline before
519 * sending data to fast-import.
520 * These helpers read back data from fast-import on their stdin, which could
521 * be mixed with import commands, otherwise.
522 */
523
524 if (finish_command(&fastimport))
525 die(_("error while running fast-import"));
526
527 /*
528 * The fast-import stream of a remote helper that advertises
529 * the "refspec" capability writes to the refs named after the
530 * right hand side of the first refspec matching each ref we
531 * were fetching.
532 *
533 * (If no "refspec" capability was specified, for historical
534 * reasons we default to the equivalent of *:*.)
535 *
536 * Store the result in to_fetch[i].old_sha1. Callers such
537 * as "git fetch" can use the value to write feedback to the
538 * terminal, populate FETCH_HEAD, and determine what new value
539 * should be written to peer_ref if the update is a
540 * fast-forward or this is a forced update.
541 */
542 for (i = 0; i < nr_heads; i++) {
543 char *private, *name;
544 posn = to_fetch[i];
545 if (posn->status & REF_STATUS_UPTODATE)
546 continue;
547 name = posn->symref ? posn->symref : posn->name;
548 if (data->rs.nr)
549 private = apply_refspecs(&data->rs, name);
550 else
551 private = xstrdup(name);
552 if (private) {
553 if (read_ref(private, &posn->old_oid) < 0)
554 die(_("could not read ref %s"), private);
555 free(private);
556 }
557 }
558 strbuf_release(&buf);
559 return 0;
560 }
561
562 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
563 {
564 struct helper_data *data = transport->data;
565 int ret = 0;
566 int duped;
567 FILE *input;
568 struct child_process *helper;
569
570 helper = get_helper(transport);
571
572 /*
573 * Yes, dup the pipe another time, as we need unbuffered version
574 * of input pipe as FILE*. fclose() closes the underlying fd and
575 * stream buffering only can be changed before first I/O operation
576 * on it.
577 */
578 duped = dup(helper->out);
579 if (duped < 0)
580 die_errno(_("can't dup helper output fd"));
581 input = xfdopen(duped, "r");
582 setvbuf(input, NULL, _IONBF, 0);
583
584 sendline(data, cmdbuf);
585 if (recvline_fh(input, cmdbuf))
586 exit(128);
587
588 if (!strcmp(cmdbuf->buf, "")) {
589 data->no_disconnect_req = 1;
590 if (debug)
591 fprintf(stderr, "Debug: Smart transport connection "
592 "ready.\n");
593 ret = 1;
594 } else if (!strcmp(cmdbuf->buf, "fallback")) {
595 if (debug)
596 fprintf(stderr, "Debug: Falling back to dumb "
597 "transport.\n");
598 } else {
599 die(_("unknown response to connect: %s"),
600 cmdbuf->buf);
601 }
602
603 fclose(input);
604 return ret;
605 }
606
607 static int process_connect_service(struct transport *transport,
608 const char *name, const char *exec)
609 {
610 struct helper_data *data = transport->data;
611 struct strbuf cmdbuf = STRBUF_INIT;
612 int ret = 0;
613
614 /*
615 * Handle --upload-pack and friends. This is fire and forget...
616 * just warn if it fails.
617 */
618 if (strcmp(name, exec)) {
619 int r = set_helper_option(transport, "servpath", exec);
620 if (r > 0)
621 warning(_("setting remote service path not supported by protocol"));
622 else if (r < 0)
623 warning(_("invalid remote service path"));
624 }
625
626 if (data->connect) {
627 strbuf_addf(&cmdbuf, "connect %s\n", name);
628 ret = run_connect(transport, &cmdbuf);
629 } else if (data->stateless_connect &&
630 (get_protocol_version_config() == protocol_v2) &&
631 !strcmp("git-upload-pack", name)) {
632 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
633 ret = run_connect(transport, &cmdbuf);
634 if (ret)
635 transport->stateless_rpc = 1;
636 }
637
638 strbuf_release(&cmdbuf);
639 return ret;
640 }
641
642 static int process_connect(struct transport *transport,
643 int for_push)
644 {
645 struct helper_data *data = transport->data;
646 const char *name;
647 const char *exec;
648
649 name = for_push ? "git-receive-pack" : "git-upload-pack";
650 if (for_push)
651 exec = data->transport_options.receivepack;
652 else
653 exec = data->transport_options.uploadpack;
654
655 return process_connect_service(transport, name, exec);
656 }
657
658 static int connect_helper(struct transport *transport, const char *name,
659 const char *exec, int fd[2])
660 {
661 struct helper_data *data = transport->data;
662
663 /* Get_helper so connect is inited. */
664 get_helper(transport);
665 if (!data->connect)
666 die(_("operation not supported by protocol"));
667
668 if (!process_connect_service(transport, name, exec))
669 die(_("can't connect to subservice %s"), name);
670
671 fd[0] = data->helper->out;
672 fd[1] = data->helper->in;
673 return 0;
674 }
675
676 static struct ref *get_refs_list_using_list(struct transport *transport,
677 int for_push);
678
679 static int fetch_refs(struct transport *transport,
680 int nr_heads, struct ref **to_fetch)
681 {
682 struct helper_data *data = transport->data;
683 int i, count;
684
685 get_helper(transport);
686
687 if (process_connect(transport, 0)) {
688 do_take_over(transport);
689 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
690 }
691
692 /*
693 * If we reach here, then the server, the client, and/or the transport
694 * helper does not support protocol v2. --negotiate-only requires
695 * protocol v2.
696 */
697 if (data->transport_options.acked_commits) {
698 warning(_("--negotiate-only requires protocol v2"));
699 return -1;
700 }
701
702 if (!data->get_refs_list_called)
703 get_refs_list_using_list(transport, 0);
704
705 count = 0;
706 for (i = 0; i < nr_heads; i++)
707 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
708 count++;
709
710 if (!count)
711 return 0;
712
713 if (data->check_connectivity &&
714 data->transport_options.check_self_contained_and_connected)
715 set_helper_option(transport, "check-connectivity", "true");
716
717 if (transport->cloning)
718 set_helper_option(transport, "cloning", "true");
719
720 if (data->transport_options.update_shallow)
721 set_helper_option(transport, "update-shallow", "true");
722
723 if (data->transport_options.refetch)
724 set_helper_option(transport, "refetch", "true");
725
726 if (data->transport_options.filter_options.choice) {
727 const char *spec = expand_list_objects_filter_spec(
728 &data->transport_options.filter_options);
729 set_helper_option(transport, "filter", spec);
730 }
731
732 if (data->transport_options.negotiation_tips)
733 warning("Ignoring --negotiation-tip because the protocol does not support it.");
734
735 if (data->fetch)
736 return fetch_with_fetch(transport, nr_heads, to_fetch);
737
738 if (data->import)
739 return fetch_with_import(transport, nr_heads, to_fetch);
740
741 return -1;
742 }
743
744 struct push_update_ref_state {
745 struct ref *hint;
746 struct ref_push_report *report;
747 int new_report;
748 };
749
750 static int push_update_ref_status(struct strbuf *buf,
751 struct push_update_ref_state *state,
752 struct ref *remote_refs)
753 {
754 char *refname, *msg;
755 int status, forced = 0;
756
757 if (starts_with(buf->buf, "option ")) {
758 struct object_id old_oid, new_oid;
759 const char *key, *val;
760 char *p;
761
762 if (!state->hint || !(state->report || state->new_report))
763 die(_("'option' without a matching 'ok/error' directive"));
764 if (state->new_report) {
765 if (!state->hint->report) {
766 CALLOC_ARRAY(state->hint->report, 1);
767 state->report = state->hint->report;
768 } else {
769 state->report = state->hint->report;
770 while (state->report->next)
771 state->report = state->report->next;
772 CALLOC_ARRAY(state->report->next, 1);
773 state->report = state->report->next;
774 }
775 state->new_report = 0;
776 }
777 key = buf->buf + 7;
778 p = strchr(key, ' ');
779 if (p)
780 *p++ = '\0';
781 val = p;
782 if (!strcmp(key, "refname"))
783 state->report->ref_name = xstrdup_or_null(val);
784 else if (!strcmp(key, "old-oid") && val &&
785 !parse_oid_hex(val, &old_oid, &val))
786 state->report->old_oid = oiddup(&old_oid);
787 else if (!strcmp(key, "new-oid") && val &&
788 !parse_oid_hex(val, &new_oid, &val))
789 state->report->new_oid = oiddup(&new_oid);
790 else if (!strcmp(key, "forced-update"))
791 state->report->forced_update = 1;
792 /* Not update remote namespace again. */
793 return 1;
794 }
795
796 state->report = NULL;
797 state->new_report = 0;
798
799 if (starts_with(buf->buf, "ok ")) {
800 status = REF_STATUS_OK;
801 refname = buf->buf + 3;
802 } else if (starts_with(buf->buf, "error ")) {
803 status = REF_STATUS_REMOTE_REJECT;
804 refname = buf->buf + 6;
805 } else
806 die(_("expected ok/error, helper said '%s'"), buf->buf);
807
808 msg = strchr(refname, ' ');
809 if (msg) {
810 struct strbuf msg_buf = STRBUF_INIT;
811 const char *end;
812
813 *msg++ = '\0';
814 if (!unquote_c_style(&msg_buf, msg, &end))
815 msg = strbuf_detach(&msg_buf, NULL);
816 else
817 msg = xstrdup(msg);
818 strbuf_release(&msg_buf);
819
820 if (!strcmp(msg, "no match")) {
821 status = REF_STATUS_NONE;
822 FREE_AND_NULL(msg);
823 }
824 else if (!strcmp(msg, "up to date")) {
825 status = REF_STATUS_UPTODATE;
826 FREE_AND_NULL(msg);
827 }
828 else if (!strcmp(msg, "non-fast forward")) {
829 status = REF_STATUS_REJECT_NONFASTFORWARD;
830 FREE_AND_NULL(msg);
831 }
832 else if (!strcmp(msg, "already exists")) {
833 status = REF_STATUS_REJECT_ALREADY_EXISTS;
834 FREE_AND_NULL(msg);
835 }
836 else if (!strcmp(msg, "fetch first")) {
837 status = REF_STATUS_REJECT_FETCH_FIRST;
838 FREE_AND_NULL(msg);
839 }
840 else if (!strcmp(msg, "needs force")) {
841 status = REF_STATUS_REJECT_NEEDS_FORCE;
842 FREE_AND_NULL(msg);
843 }
844 else if (!strcmp(msg, "stale info")) {
845 status = REF_STATUS_REJECT_STALE;
846 FREE_AND_NULL(msg);
847 }
848 else if (!strcmp(msg, "remote ref updated since checkout")) {
849 status = REF_STATUS_REJECT_REMOTE_UPDATED;
850 FREE_AND_NULL(msg);
851 }
852 else if (!strcmp(msg, "forced update")) {
853 forced = 1;
854 FREE_AND_NULL(msg);
855 }
856 else if (!strcmp(msg, "expecting report")) {
857 status = REF_STATUS_EXPECTING_REPORT;
858 FREE_AND_NULL(msg);
859 }
860 }
861
862 if (state->hint)
863 state->hint = find_ref_by_name(state->hint, refname);
864 if (!state->hint)
865 state->hint = find_ref_by_name(remote_refs, refname);
866 if (!state->hint) {
867 warning(_("helper reported unexpected status of %s"), refname);
868 return 1;
869 }
870
871 if (state->hint->status != REF_STATUS_NONE) {
872 /*
873 * Earlier, the ref was marked not to be pushed, so ignore the ref
874 * status reported by the remote helper if the latter is 'no match'.
875 */
876 if (status == REF_STATUS_NONE)
877 return 1;
878 }
879
880 if (status == REF_STATUS_OK)
881 state->new_report = 1;
882 state->hint->status = status;
883 state->hint->forced_update |= forced;
884 state->hint->remote_status = msg;
885 return !(status == REF_STATUS_OK);
886 }
887
888 static int push_update_refs_status(struct helper_data *data,
889 struct ref *remote_refs,
890 int flags)
891 {
892 struct ref *ref;
893 struct ref_push_report *report;
894 struct strbuf buf = STRBUF_INIT;
895 struct push_update_ref_state state = { remote_refs, NULL, 0 };
896
897 for (;;) {
898 if (recvline(data, &buf)) {
899 strbuf_release(&buf);
900 return 1;
901 }
902 if (!buf.len)
903 break;
904 push_update_ref_status(&buf, &state, remote_refs);
905 }
906 strbuf_release(&buf);
907
908 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
909 return 0;
910
911 /* propagate back the update to the remote namespace */
912 for (ref = remote_refs; ref; ref = ref->next) {
913 char *private;
914
915 if (ref->status != REF_STATUS_OK)
916 continue;
917
918 if (!ref->report) {
919 private = apply_refspecs(&data->rs, ref->name);
920 if (!private)
921 continue;
922 update_ref("update by helper", private, &(ref->new_oid),
923 NULL, 0, 0);
924 free(private);
925 } else {
926 for (report = ref->report; report; report = report->next) {
927 private = apply_refspecs(&data->rs,
928 report->ref_name
929 ? report->ref_name
930 : ref->name);
931 if (!private)
932 continue;
933 update_ref("update by helper", private,
934 report->new_oid
935 ? report->new_oid
936 : &(ref->new_oid),
937 NULL, 0, 0);
938 free(private);
939 }
940 }
941 }
942 return 0;
943 }
944
945 static void set_common_push_options(struct transport *transport,
946 const char *name, int flags)
947 {
948 if (flags & TRANSPORT_PUSH_DRY_RUN) {
949 if (set_helper_option(transport, "dry-run", "true") != 0)
950 die(_("helper %s does not support dry-run"), name);
951 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
952 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
953 die(_("helper %s does not support --signed"), name);
954 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
955 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
956 die(_("helper %s does not support --signed=if-asked"), name);
957 }
958
959 if (flags & TRANSPORT_PUSH_ATOMIC)
960 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
961 die(_("helper %s does not support --atomic"), name);
962
963 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
964 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
965 die(_("helper %s does not support --%s"),
966 name, TRANS_OPT_FORCE_IF_INCLUDES);
967
968 if (flags & TRANSPORT_PUSH_OPTIONS) {
969 struct string_list_item *item;
970 for_each_string_list_item(item, transport->push_options)
971 if (set_helper_option(transport, "push-option", item->string) != 0)
972 die(_("helper %s does not support 'push-option'"), name);
973 }
974 }
975
976 static int push_refs_with_push(struct transport *transport,
977 struct ref *remote_refs, int flags)
978 {
979 int force_all = flags & TRANSPORT_PUSH_FORCE;
980 int mirror = flags & TRANSPORT_PUSH_MIRROR;
981 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
982 struct helper_data *data = transport->data;
983 struct strbuf buf = STRBUF_INIT;
984 struct ref *ref;
985 struct string_list cas_options = STRING_LIST_INIT_DUP;
986 struct string_list_item *cas_option;
987
988 get_helper(transport);
989 if (!data->push)
990 return 1;
991
992 for (ref = remote_refs; ref; ref = ref->next) {
993 if (!ref->peer_ref && !mirror)
994 continue;
995
996 /* Check for statuses set by set_ref_status_for_push() */
997 switch (ref->status) {
998 case REF_STATUS_REJECT_NONFASTFORWARD:
999 case REF_STATUS_REJECT_STALE:
1000 case REF_STATUS_REJECT_ALREADY_EXISTS:
1001 case REF_STATUS_REJECT_REMOTE_UPDATED:
1002 if (atomic) {
1003 reject_atomic_push(remote_refs, mirror);
1004 string_list_clear(&cas_options, 0);
1005 return 0;
1006 } else
1007 continue;
1008 case REF_STATUS_UPTODATE:
1009 continue;
1010 default:
1011 ; /* do nothing */
1012 }
1013
1014 if (force_all)
1015 ref->force = 1;
1016
1017 strbuf_addstr(&buf, "push ");
1018 if (!ref->deletion) {
1019 if (ref->force)
1020 strbuf_addch(&buf, '+');
1021 if (ref->peer_ref)
1022 strbuf_addstr(&buf, ref->peer_ref->name);
1023 else
1024 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1025 }
1026 strbuf_addch(&buf, ':');
1027 strbuf_addstr(&buf, ref->name);
1028 strbuf_addch(&buf, '\n');
1029
1030 /*
1031 * The "--force-with-lease" options without explicit
1032 * values to expect have already been expanded into
1033 * the ref->old_oid_expect[] field; we can ignore
1034 * transport->smart_options->cas altogether and instead
1035 * can enumerate them from the refs.
1036 */
1037 if (ref->expect_old_sha1) {
1038 struct strbuf cas = STRBUF_INIT;
1039 strbuf_addf(&cas, "%s:%s",
1040 ref->name, oid_to_hex(&ref->old_oid_expect));
1041 string_list_append_nodup(&cas_options,
1042 strbuf_detach(&cas, NULL));
1043 }
1044 }
1045 if (buf.len == 0) {
1046 string_list_clear(&cas_options, 0);
1047 return 0;
1048 }
1049
1050 for_each_string_list_item(cas_option, &cas_options)
1051 set_helper_option(transport, "cas", cas_option->string);
1052 set_common_push_options(transport, data->name, flags);
1053
1054 strbuf_addch(&buf, '\n');
1055 sendline(data, &buf);
1056 strbuf_release(&buf);
1057 string_list_clear(&cas_options, 0);
1058
1059 return push_update_refs_status(data, remote_refs, flags);
1060 }
1061
1062 static int push_refs_with_export(struct transport *transport,
1063 struct ref *remote_refs, int flags)
1064 {
1065 struct ref *ref;
1066 struct child_process *helper, exporter;
1067 struct helper_data *data = transport->data;
1068 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1069 struct strbuf buf = STRBUF_INIT;
1070
1071 if (!data->rs.nr)
1072 die(_("remote-helper doesn't support push; refspec needed"));
1073
1074 set_common_push_options(transport, data->name, flags);
1075 if (flags & TRANSPORT_PUSH_FORCE) {
1076 if (set_helper_option(transport, "force", "true") != 0)
1077 warning(_("helper %s does not support 'force'"), data->name);
1078 }
1079
1080 helper = get_helper(transport);
1081
1082 write_constant(helper->in, "export\n");
1083
1084 for (ref = remote_refs; ref; ref = ref->next) {
1085 char *private;
1086 struct object_id oid;
1087
1088 private = apply_refspecs(&data->rs, ref->name);
1089 if (private && !repo_get_oid(the_repository, private, &oid)) {
1090 strbuf_addf(&buf, "^%s", private);
1091 string_list_append_nodup(&revlist_args,
1092 strbuf_detach(&buf, NULL));
1093 oidcpy(&ref->old_oid, &oid);
1094 }
1095 free(private);
1096
1097 if (ref->peer_ref) {
1098 if (strcmp(ref->name, ref->peer_ref->name)) {
1099 if (!ref->deletion) {
1100 const char *name;
1101 int flag;
1102
1103 /* Follow symbolic refs (mainly for HEAD). */
1104 name = resolve_ref_unsafe(ref->peer_ref->name,
1105 RESOLVE_REF_READING,
1106 &oid, &flag);
1107 if (!name || !(flag & REF_ISSYMREF))
1108 name = ref->peer_ref->name;
1109
1110 strbuf_addf(&buf, "%s:%s", name, ref->name);
1111 } else
1112 strbuf_addf(&buf, ":%s", ref->name);
1113
1114 string_list_append(&revlist_args, "--refspec");
1115 string_list_append(&revlist_args, buf.buf);
1116 strbuf_release(&buf);
1117 }
1118 if (!ref->deletion)
1119 string_list_append(&revlist_args, ref->peer_ref->name);
1120 }
1121 }
1122
1123 if (get_exporter(transport, &exporter, &revlist_args))
1124 die(_("couldn't run fast-export"));
1125
1126 string_list_clear(&revlist_args, 1);
1127
1128 if (finish_command(&exporter))
1129 die(_("error while running fast-export"));
1130 if (push_update_refs_status(data, remote_refs, flags))
1131 return 1;
1132
1133 if (data->export_marks) {
1134 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1135 rename(buf.buf, data->export_marks);
1136 strbuf_release(&buf);
1137 }
1138
1139 return 0;
1140 }
1141
1142 static int push_refs(struct transport *transport,
1143 struct ref *remote_refs, int flags)
1144 {
1145 struct helper_data *data = transport->data;
1146
1147 if (process_connect(transport, 1)) {
1148 do_take_over(transport);
1149 return transport->vtable->push_refs(transport, remote_refs, flags);
1150 }
1151
1152 if (!remote_refs) {
1153 fprintf(stderr,
1154 _("No refs in common and none specified; doing nothing.\n"
1155 "Perhaps you should specify a branch.\n"));
1156 return 0;
1157 }
1158
1159 if (data->push)
1160 return push_refs_with_push(transport, remote_refs, flags);
1161
1162 if (data->export)
1163 return push_refs_with_export(transport, remote_refs, flags);
1164
1165 return -1;
1166 }
1167
1168
1169 static int has_attribute(const char *attrs, const char *attr)
1170 {
1171 int len;
1172 if (!attrs)
1173 return 0;
1174
1175 len = strlen(attr);
1176 for (;;) {
1177 const char *space = strchrnul(attrs, ' ');
1178 if (len == space - attrs && !strncmp(attrs, attr, len))
1179 return 1;
1180 if (!*space)
1181 return 0;
1182 attrs = space + 1;
1183 }
1184 }
1185
1186 static struct ref *get_refs_list(struct transport *transport, int for_push,
1187 struct transport_ls_refs_options *transport_options)
1188 {
1189 get_helper(transport);
1190
1191 if (process_connect(transport, for_push)) {
1192 do_take_over(transport);
1193 return transport->vtable->get_refs_list(transport, for_push,
1194 transport_options);
1195 }
1196
1197 return get_refs_list_using_list(transport, for_push);
1198 }
1199
1200 static struct ref *get_refs_list_using_list(struct transport *transport,
1201 int for_push)
1202 {
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;
1209
1210 data->get_refs_list_called = 1;
1211 helper = get_helper(transport);
1212
1213 if (data->object_format) {
1214 write_str_in_full(helper->in, "option object-format\n");
1215 if (recvline(data, &buf) || strcmp(buf.buf, "ok"))
1216 exit(128);
1217 }
1218
1219 if (data->push && for_push)
1220 write_str_in_full(helper->in, "list for-push\n");
1221 else
1222 write_str_in_full(helper->in, "list\n");
1223
1224 while (1) {
1225 char *eov, *eon;
1226 if (recvline(data, &buf))
1227 exit(128);
1228
1229 if (!*buf.buf)
1230 break;
1231 else if (buf.buf[0] == ':') {
1232 const char *value;
1233 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1234 int algo = hash_algo_by_name(value);
1235 if (algo == GIT_HASH_UNKNOWN)
1236 die(_("unsupported object format '%s'"),
1237 value);
1238 transport->hash_algo = &hash_algos[algo];
1239 }
1240 continue;
1241 }
1242
1243 eov = strchr(buf.buf, ' ');
1244 if (!eov)
1245 die(_("malformed response in ref list: %s"), buf.buf);
1246 eon = strchr(eov + 1, ' ');
1247 *eov = '\0';
1248 if (eon)
1249 *eon = '\0';
1250 *tail = alloc_ref(eov + 1);
1251 if (buf.buf[0] == '@')
1252 (*tail)->symref = xstrdup(buf.buf + 1);
1253 else if (buf.buf[0] != '?')
1254 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1255 if (eon) {
1256 if (has_attribute(eon + 1, "unchanged")) {
1257 (*tail)->status |= REF_STATUS_UPTODATE;
1258 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
1259 die(_("could not read ref %s"),
1260 (*tail)->name);
1261 }
1262 }
1263 tail = &((*tail)->next);
1264 }
1265 if (debug)
1266 fprintf(stderr, "Debug: Read ref listing.\n");
1267 strbuf_release(&buf);
1268
1269 for (posn = ret; posn; posn = posn->next)
1270 resolve_remote_symref(posn, ret);
1271
1272 return ret;
1273 }
1274
1275 static int get_bundle_uri(struct transport *transport)
1276 {
1277 get_helper(transport);
1278
1279 if (process_connect(transport, 0)) {
1280 do_take_over(transport);
1281 return transport->vtable->get_bundle_uri(transport);
1282 }
1283
1284 return -1;
1285 }
1286
1287 static struct transport_vtable vtable = {
1288 .set_option = set_helper_option,
1289 .get_refs_list = get_refs_list,
1290 .get_bundle_uri = get_bundle_uri,
1291 .fetch_refs = fetch_refs,
1292 .push_refs = push_refs,
1293 .connect = connect_helper,
1294 .disconnect = release_helper
1295 };
1296
1297 int transport_helper_init(struct transport *transport, const char *name)
1298 {
1299 struct helper_data *data = xcalloc(1, sizeof(*data));
1300 data->name = name;
1301
1302 transport_check_allowed(name);
1303
1304 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1305 debug = 1;
1306
1307 list_objects_filter_init(&data->transport_options.filter_options);
1308
1309 transport->data = data;
1310 transport->vtable = &vtable;
1311 transport->smart_options = &(data->transport_options);
1312 return 0;
1313 }
1314
1315 /*
1316 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1317 * buffer less), so attempt reads and writes with up to that size.
1318 */
1319 #define BUFFERSIZE 65536
1320 /* This should be enough to hold debugging message. */
1321 #define PBUFFERSIZE 8192
1322
1323 /* Print bidirectional transfer loop debug message. */
1324 __attribute__((format (printf, 1, 2)))
1325 static void transfer_debug(const char *fmt, ...)
1326 {
1327 /*
1328 * NEEDSWORK: This function is sometimes used from multiple threads, and
1329 * we end up using debug_enabled racily. That "should not matter" since
1330 * we always write the same value, but it's still wrong. This function
1331 * is listed in .tsan-suppressions for the time being.
1332 */
1333
1334 va_list args;
1335 char msgbuf[PBUFFERSIZE];
1336 static int debug_enabled = -1;
1337
1338 if (debug_enabled < 0)
1339 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1340 if (!debug_enabled)
1341 return;
1342
1343 va_start(args, fmt);
1344 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1345 va_end(args);
1346 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1347 }
1348
1349 /* Stream state: More data may be coming in this direction. */
1350 #define SSTATE_TRANSFERRING 0
1351 /*
1352 * Stream state: No more data coming in this direction, flushing rest of
1353 * data.
1354 */
1355 #define SSTATE_FLUSHING 1
1356 /* Stream state: Transfer in this direction finished. */
1357 #define SSTATE_FINISHED 2
1358
1359 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1360 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1361 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1362
1363 /* Unidirectional transfer. */
1364 struct unidirectional_transfer {
1365 /* Source */
1366 int src;
1367 /* Destination */
1368 int dest;
1369 /* Is source socket? */
1370 int src_is_sock;
1371 /* Is destination socket? */
1372 int dest_is_sock;
1373 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1374 int state;
1375 /* Buffer. */
1376 char buf[BUFFERSIZE];
1377 /* Buffer used. */
1378 size_t bufuse;
1379 /* Name of source. */
1380 const char *src_name;
1381 /* Name of destination. */
1382 const char *dest_name;
1383 };
1384
1385 /* Closes the target (for writing) if transfer has finished. */
1386 static void udt_close_if_finished(struct unidirectional_transfer *t)
1387 {
1388 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1389 t->state = SSTATE_FINISHED;
1390 if (t->dest_is_sock)
1391 shutdown(t->dest, SHUT_WR);
1392 else
1393 close(t->dest);
1394 transfer_debug("Closed %s.", t->dest_name);
1395 }
1396 }
1397
1398 /*
1399 * Tries to read data from source into buffer. If buffer is full,
1400 * no data is read. Returns 0 on success, -1 on error.
1401 */
1402 static int udt_do_read(struct unidirectional_transfer *t)
1403 {
1404 ssize_t bytes;
1405
1406 if (t->bufuse == BUFFERSIZE)
1407 return 0; /* No space for more. */
1408
1409 transfer_debug("%s is readable", t->src_name);
1410 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1411 if (bytes < 0) {
1412 error_errno(_("read(%s) failed"), t->src_name);
1413 return -1;
1414 } else if (bytes == 0) {
1415 transfer_debug("%s EOF (with %i bytes in buffer)",
1416 t->src_name, (int)t->bufuse);
1417 t->state = SSTATE_FLUSHING;
1418 } else if (bytes > 0) {
1419 t->bufuse += bytes;
1420 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1421 (int)bytes, t->src_name, (int)t->bufuse);
1422 }
1423 return 0;
1424 }
1425
1426 /* Tries to write data from buffer into destination. If buffer is empty,
1427 * no data is written. Returns 0 on success, -1 on error.
1428 */
1429 static int udt_do_write(struct unidirectional_transfer *t)
1430 {
1431 ssize_t bytes;
1432
1433 if (t->bufuse == 0)
1434 return 0; /* Nothing to write. */
1435
1436 transfer_debug("%s is writable", t->dest_name);
1437 bytes = xwrite(t->dest, t->buf, t->bufuse);
1438 if (bytes < 0) {
1439 error_errno(_("write(%s) failed"), t->dest_name);
1440 return -1;
1441 } else if (bytes > 0) {
1442 t->bufuse -= bytes;
1443 if (t->bufuse)
1444 memmove(t->buf, t->buf + bytes, t->bufuse);
1445 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1446 (int)bytes, t->dest_name, (int)t->bufuse);
1447 }
1448 return 0;
1449 }
1450
1451
1452 /* State of bidirectional transfer loop. */
1453 struct bidirectional_transfer_state {
1454 /* Direction from program to git. */
1455 struct unidirectional_transfer ptg;
1456 /* Direction from git to program. */
1457 struct unidirectional_transfer gtp;
1458 };
1459
1460 static void *udt_copy_task_routine(void *udt)
1461 {
1462 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1463 while (t->state != SSTATE_FINISHED) {
1464 if (STATE_NEEDS_READING(t->state))
1465 if (udt_do_read(t))
1466 return NULL;
1467 if (STATE_NEEDS_WRITING(t->state))
1468 if (udt_do_write(t))
1469 return NULL;
1470 if (STATE_NEEDS_CLOSING(t->state))
1471 udt_close_if_finished(t);
1472 }
1473 return udt; /* Just some non-NULL value. */
1474 }
1475
1476 #ifndef NO_PTHREADS
1477
1478 /*
1479 * Join thread, with appropriate errors on failure. Name is name for the
1480 * thread (for error messages). Returns 0 on success, 1 on failure.
1481 */
1482 static int tloop_join(pthread_t thread, const char *name)
1483 {
1484 int err;
1485 void *tret;
1486 err = pthread_join(thread, &tret);
1487 if (!tret) {
1488 error(_("%s thread failed"), name);
1489 return 1;
1490 }
1491 if (err) {
1492 error(_("%s thread failed to join: %s"), name, strerror(err));
1493 return 1;
1494 }
1495 return 0;
1496 }
1497
1498 /*
1499 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1500 * -1 on failure.
1501 */
1502 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1503 {
1504 pthread_t gtp_thread;
1505 pthread_t ptg_thread;
1506 int err;
1507 int ret = 0;
1508 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1509 &s->gtp);
1510 if (err)
1511 die(_("can't start thread for copying data: %s"), strerror(err));
1512 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1513 &s->ptg);
1514 if (err)
1515 die(_("can't start thread for copying data: %s"), strerror(err));
1516
1517 ret |= tloop_join(gtp_thread, "Git to program copy");
1518 ret |= tloop_join(ptg_thread, "Program to git copy");
1519 return ret;
1520 }
1521 #else
1522
1523 /* Close the source and target (for writing) for transfer. */
1524 static void udt_kill_transfer(struct unidirectional_transfer *t)
1525 {
1526 t->state = SSTATE_FINISHED;
1527 /*
1528 * Socket read end left open isn't a disaster if nobody
1529 * attempts to read from it (mingw compat headers do not
1530 * have SHUT_RD)...
1531 *
1532 * We can't fully close the socket since otherwise gtp
1533 * task would first close the socket it sends data to
1534 * while closing the ptg file descriptors.
1535 */
1536 if (!t->src_is_sock)
1537 close(t->src);
1538 if (t->dest_is_sock)
1539 shutdown(t->dest, SHUT_WR);
1540 else
1541 close(t->dest);
1542 }
1543
1544 /*
1545 * Join process, with appropriate errors on failure. Name is name for the
1546 * process (for error messages). Returns 0 on success, 1 on failure.
1547 */
1548 static int tloop_join(pid_t pid, const char *name)
1549 {
1550 int tret;
1551 if (waitpid(pid, &tret, 0) < 0) {
1552 error_errno(_("%s process failed to wait"), name);
1553 return 1;
1554 }
1555 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1556 error(_("%s process failed"), name);
1557 return 1;
1558 }
1559 return 0;
1560 }
1561
1562 /*
1563 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1564 * -1 on failure.
1565 */
1566 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1567 {
1568 pid_t pid1, pid2;
1569 int ret = 0;
1570
1571 /* Fork thread #1: git to program. */
1572 pid1 = fork();
1573 if (pid1 < 0)
1574 die_errno(_("can't start thread for copying data"));
1575 else if (pid1 == 0) {
1576 udt_kill_transfer(&s->ptg);
1577 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1578 }
1579
1580 /* Fork thread #2: program to git. */
1581 pid2 = fork();
1582 if (pid2 < 0)
1583 die_errno(_("can't start thread for copying data"));
1584 else if (pid2 == 0) {
1585 udt_kill_transfer(&s->gtp);
1586 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1587 }
1588
1589 /*
1590 * Close both streams in parent as to not interfere with
1591 * end of file detection and wait for both tasks to finish.
1592 */
1593 udt_kill_transfer(&s->gtp);
1594 udt_kill_transfer(&s->ptg);
1595 ret |= tloop_join(pid1, "Git to program copy");
1596 ret |= tloop_join(pid2, "Program to git copy");
1597 return ret;
1598 }
1599 #endif
1600
1601 /*
1602 * Copies data from stdin to output and from input to stdout simultaneously.
1603 * Additionally filtering through given filter. If filter is NULL, uses
1604 * identity filter.
1605 */
1606 int bidirectional_transfer_loop(int input, int output)
1607 {
1608 struct bidirectional_transfer_state state;
1609
1610 /* Fill the state fields. */
1611 state.ptg.src = input;
1612 state.ptg.dest = 1;
1613 state.ptg.src_is_sock = (input == output);
1614 state.ptg.dest_is_sock = 0;
1615 state.ptg.state = SSTATE_TRANSFERRING;
1616 state.ptg.bufuse = 0;
1617 state.ptg.src_name = "remote input";
1618 state.ptg.dest_name = "stdout";
1619
1620 state.gtp.src = 0;
1621 state.gtp.dest = output;
1622 state.gtp.src_is_sock = 0;
1623 state.gtp.dest_is_sock = (input == output);
1624 state.gtp.state = SSTATE_TRANSFERRING;
1625 state.gtp.bufuse = 0;
1626 state.gtp.src_name = "stdin";
1627 state.gtp.dest_name = "remote output";
1628
1629 return tloop_spawnwait_tasks(&state);
1630 }
1631
1632 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1633 {
1634 struct ref *ref;
1635
1636 /* Mark other refs as failed */
1637 for (ref = remote_refs; ref; ref = ref->next) {
1638 if (!ref->peer_ref && !mirror_mode)
1639 continue;
1640
1641 switch (ref->status) {
1642 case REF_STATUS_NONE:
1643 case REF_STATUS_OK:
1644 case REF_STATUS_EXPECTING_REPORT:
1645 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1646 continue;
1647 default:
1648 break; /* do nothing */
1649 }
1650 }
1651 return;
1652 }
git for Debian