]> git.ipfire.org Git - thirdparty/git.git/blob - transport-helper.c
Merge branch 'jk/clone-allow-bare-and-o-together'
[thirdparty/git.git] / transport-helper.c
1 #include "cache.h"
2 #include "transport.h"
3 #include "quote.h"
4 #include "run-command.h"
5 #include "commit.h"
6 #include "diff.h"
7 #include "revision.h"
8 #include "remote.h"
9 #include "string-list.h"
10 #include "thread-utils.h"
11 #include "sigchain.h"
12 #include "strvec.h"
13 #include "refs.h"
14 #include "refspec.h"
15 #include "transport-internal.h"
16 #include "protocol.h"
17
18 static int debug;
19
20 struct helper_data {
21 const char *name;
22 struct child_process *helper;
23 FILE *out;
24 unsigned fetch : 1,
25 import : 1,
26 bidi_import : 1,
27 export : 1,
28 option : 1,
29 push : 1,
30 connect : 1,
31 stateless_connect : 1,
32 signed_tags : 1,
33 check_connectivity : 1,
34 no_disconnect_req : 1,
35 no_private_update : 1,
36 object_format : 1;
37
38 /*
39 * As an optimization, the transport code may invoke fetch before
40 * get_refs_list. If this happens, and if the transport helper doesn't
41 * support connect or stateless_connect, we need to invoke
42 * get_refs_list ourselves if we haven't already done so. Keep track of
43 * whether we have invoked get_refs_list.
44 */
45 unsigned get_refs_list_called : 1;
46
47 char *export_marks;
48 char *import_marks;
49 /* These go from remote name (as in "list") to private name */
50 struct refspec rs;
51 /* Transport options for fetch-pack/send-pack (should one of
52 * those be invoked).
53 */
54 struct git_transport_options transport_options;
55 };
56
57 static void sendline(struct helper_data *helper, struct strbuf *buffer)
58 {
59 if (debug)
60 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
61 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
62 die_errno(_("full write to remote helper failed"));
63 }
64
65 static int recvline_fh(FILE *helper, struct strbuf *buffer)
66 {
67 strbuf_reset(buffer);
68 if (debug)
69 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
70 if (strbuf_getline(buffer, helper) == EOF) {
71 if (debug)
72 fprintf(stderr, "Debug: Remote helper quit.\n");
73 return 1;
74 }
75
76 if (debug)
77 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
78 return 0;
79 }
80
81 static int recvline(struct helper_data *helper, struct strbuf *buffer)
82 {
83 return recvline_fh(helper->out, buffer);
84 }
85
86 static void write_constant(int fd, const char *str)
87 {
88 if (debug)
89 fprintf(stderr, "Debug: Remote helper: -> %s", str);
90 if (write_in_full(fd, str, strlen(str)) < 0)
91 die_errno(_("full write to remote helper failed"));
92 }
93
94 static const char *remove_ext_force(const char *url)
95 {
96 if (url) {
97 const char *colon = strchr(url, ':');
98 if (colon && colon[1] == ':')
99 return colon + 2;
100 }
101 return url;
102 }
103
104 static void do_take_over(struct transport *transport)
105 {
106 struct helper_data *data;
107 data = (struct helper_data *)transport->data;
108 transport_take_over(transport, data->helper);
109 fclose(data->out);
110 free(data);
111 }
112
113 static void standard_options(struct transport *t);
114
115 static struct child_process *get_helper(struct transport *transport)
116 {
117 struct helper_data *data = transport->data;
118 struct strbuf buf = STRBUF_INIT;
119 struct child_process *helper;
120 int duped;
121 int code;
122
123 if (data->helper)
124 return data->helper;
125
126 helper = xmalloc(sizeof(*helper));
127 child_process_init(helper);
128 helper->in = -1;
129 helper->out = -1;
130 helper->err = 0;
131 strvec_pushf(&helper->args, "remote-%s", data->name);
132 strvec_push(&helper->args, transport->remote->name);
133 strvec_push(&helper->args, remove_ext_force(transport->url));
134 helper->git_cmd = 1;
135 helper->silent_exec_failure = 1;
136
137 if (have_git_dir())
138 strvec_pushf(&helper->env, "%s=%s",
139 GIT_DIR_ENVIRONMENT, get_git_dir());
140
141 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
142
143 code = start_command(helper);
144 if (code < 0 && errno == ENOENT)
145 die(_("unable to find remote helper for '%s'"), data->name);
146 else if (code != 0)
147 exit(code);
148
149 data->helper = helper;
150 data->no_disconnect_req = 0;
151 refspec_init(&data->rs, REFSPEC_FETCH);
152
153 /*
154 * Open the output as FILE* so strbuf_getline_*() family of
155 * functions can be used.
156 * Do this with duped fd because fclose() will close the fd,
157 * and stuff like taking over will require the fd to remain.
158 */
159 duped = dup(helper->out);
160 if (duped < 0)
161 die_errno(_("can't dup helper output fd"));
162 data->out = xfdopen(duped, "r");
163
164 write_constant(helper->in, "capabilities\n");
165
166 while (1) {
167 const char *capname, *arg;
168 int mandatory = 0;
169 if (recvline(data, &buf))
170 exit(128);
171
172 if (!*buf.buf)
173 break;
174
175 if (*buf.buf == '*') {
176 capname = buf.buf + 1;
177 mandatory = 1;
178 } else
179 capname = buf.buf;
180
181 if (debug)
182 fprintf(stderr, "Debug: Got cap %s\n", capname);
183 if (!strcmp(capname, "fetch"))
184 data->fetch = 1;
185 else if (!strcmp(capname, "option"))
186 data->option = 1;
187 else if (!strcmp(capname, "push"))
188 data->push = 1;
189 else if (!strcmp(capname, "import"))
190 data->import = 1;
191 else if (!strcmp(capname, "bidi-import"))
192 data->bidi_import = 1;
193 else if (!strcmp(capname, "export"))
194 data->export = 1;
195 else if (!strcmp(capname, "check-connectivity"))
196 data->check_connectivity = 1;
197 else if (skip_prefix(capname, "refspec ", &arg)) {
198 refspec_append(&data->rs, arg);
199 } else if (!strcmp(capname, "connect")) {
200 data->connect = 1;
201 } else if (!strcmp(capname, "stateless-connect")) {
202 data->stateless_connect = 1;
203 } else if (!strcmp(capname, "signed-tags")) {
204 data->signed_tags = 1;
205 } else if (skip_prefix(capname, "export-marks ", &arg)) {
206 data->export_marks = xstrdup(arg);
207 } else if (skip_prefix(capname, "import-marks ", &arg)) {
208 data->import_marks = xstrdup(arg);
209 } else if (starts_with(capname, "no-private-update")) {
210 data->no_private_update = 1;
211 } else if (starts_with(capname, "object-format")) {
212 data->object_format = 1;
213 } else if (mandatory) {
214 die(_("unknown mandatory capability %s; this remote "
215 "helper probably needs newer version of Git"),
216 capname);
217 }
218 }
219 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
220 warning(_("this remote helper should implement refspec capability"));
221 }
222 strbuf_release(&buf);
223 if (debug)
224 fprintf(stderr, "Debug: Capabilities complete.\n");
225 standard_options(transport);
226 return data->helper;
227 }
228
229 static int disconnect_helper(struct transport *transport)
230 {
231 struct helper_data *data = transport->data;
232 int res = 0;
233
234 if (data->helper) {
235 if (debug)
236 fprintf(stderr, "Debug: Disconnecting.\n");
237 if (!data->no_disconnect_req) {
238 /*
239 * Ignore write errors; there's nothing we can do,
240 * since we're about to close the pipe anyway. And the
241 * most likely error is EPIPE due to the helper dying
242 * to report an error itself.
243 */
244 sigchain_push(SIGPIPE, SIG_IGN);
245 xwrite(data->helper->in, "\n", 1);
246 sigchain_pop(SIGPIPE);
247 }
248 close(data->helper->in);
249 close(data->helper->out);
250 fclose(data->out);
251 res = finish_command(data->helper);
252 FREE_AND_NULL(data->helper);
253 }
254 return res;
255 }
256
257 static const char *unsupported_options[] = {
258 TRANS_OPT_UPLOADPACK,
259 TRANS_OPT_RECEIVEPACK,
260 TRANS_OPT_THIN,
261 TRANS_OPT_KEEP
262 };
263
264 static const char *boolean_options[] = {
265 TRANS_OPT_THIN,
266 TRANS_OPT_KEEP,
267 TRANS_OPT_FOLLOWTAGS,
268 TRANS_OPT_DEEPEN_RELATIVE
269 };
270
271 static int strbuf_set_helper_option(struct helper_data *data,
272 struct strbuf *buf)
273 {
274 int ret;
275
276 sendline(data, buf);
277 if (recvline(data, buf))
278 exit(128);
279
280 if (!strcmp(buf->buf, "ok"))
281 ret = 0;
282 else if (starts_with(buf->buf, "error"))
283 ret = -1;
284 else if (!strcmp(buf->buf, "unsupported"))
285 ret = 1;
286 else {
287 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
288 ret = 1;
289 }
290 return ret;
291 }
292
293 static int string_list_set_helper_option(struct helper_data *data,
294 const char *name,
295 struct string_list *list)
296 {
297 struct strbuf buf = STRBUF_INIT;
298 int i, ret = 0;
299
300 for (i = 0; i < list->nr; i++) {
301 strbuf_addf(&buf, "option %s ", name);
302 quote_c_style(list->items[i].string, &buf, NULL, 0);
303 strbuf_addch(&buf, '\n');
304
305 if ((ret = strbuf_set_helper_option(data, &buf)))
306 break;
307 strbuf_reset(&buf);
308 }
309 strbuf_release(&buf);
310 return ret;
311 }
312
313 static int set_helper_option(struct transport *transport,
314 const char *name, const char *value)
315 {
316 struct helper_data *data = transport->data;
317 struct strbuf buf = STRBUF_INIT;
318 int i, ret, is_bool = 0;
319
320 get_helper(transport);
321
322 if (!data->option)
323 return 1;
324
325 if (!strcmp(name, "deepen-not"))
326 return string_list_set_helper_option(data, name,
327 (struct string_list *)value);
328
329 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
330 if (!strcmp(name, unsupported_options[i]))
331 return 1;
332 }
333
334 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
335 if (!strcmp(name, boolean_options[i])) {
336 is_bool = 1;
337 break;
338 }
339 }
340
341 strbuf_addf(&buf, "option %s ", name);
342 if (is_bool)
343 strbuf_addstr(&buf, value ? "true" : "false");
344 else
345 quote_c_style(value, &buf, NULL, 0);
346 strbuf_addch(&buf, '\n');
347
348 ret = strbuf_set_helper_option(data, &buf);
349 strbuf_release(&buf);
350 return ret;
351 }
352
353 static void standard_options(struct transport *t)
354 {
355 char buf[16];
356 int v = t->verbose;
357
358 set_helper_option(t, "progress", t->progress ? "true" : "false");
359
360 xsnprintf(buf, sizeof(buf), "%d", v + 1);
361 set_helper_option(t, "verbosity", buf);
362
363 switch (t->family) {
364 case TRANSPORT_FAMILY_ALL:
365 /*
366 * this is already the default,
367 * do not break old remote helpers by setting "all" here
368 */
369 break;
370 case TRANSPORT_FAMILY_IPV4:
371 set_helper_option(t, "family", "ipv4");
372 break;
373 case TRANSPORT_FAMILY_IPV6:
374 set_helper_option(t, "family", "ipv6");
375 break;
376 }
377 }
378
379 static int release_helper(struct transport *transport)
380 {
381 int res = 0;
382 struct helper_data *data = transport->data;
383 refspec_clear(&data->rs);
384 res = disconnect_helper(transport);
385 free(transport->data);
386 return res;
387 }
388
389 static int fetch_with_fetch(struct transport *transport,
390 int nr_heads, struct ref **to_fetch)
391 {
392 struct helper_data *data = transport->data;
393 int i;
394 struct strbuf buf = STRBUF_INIT;
395
396 for (i = 0; i < nr_heads; i++) {
397 const struct ref *posn = to_fetch[i];
398 if (posn->status & REF_STATUS_UPTODATE)
399 continue;
400
401 strbuf_addf(&buf, "fetch %s %s\n",
402 oid_to_hex(&posn->old_oid),
403 posn->symref ? posn->symref : posn->name);
404 }
405
406 strbuf_addch(&buf, '\n');
407 sendline(data, &buf);
408
409 while (1) {
410 const char *name;
411
412 if (recvline(data, &buf))
413 exit(128);
414
415 if (skip_prefix(buf.buf, "lock ", &name)) {
416 if (transport->pack_lockfiles.nr)
417 warning(_("%s also locked %s"), data->name, name);
418 else
419 string_list_append(&transport->pack_lockfiles,
420 name);
421 }
422 else if (data->check_connectivity &&
423 data->transport_options.check_self_contained_and_connected &&
424 !strcmp(buf.buf, "connectivity-ok"))
425 data->transport_options.self_contained_and_connected = 1;
426 else if (!buf.len)
427 break;
428 else
429 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
430 }
431 strbuf_release(&buf);
432 return 0;
433 }
434
435 static int get_importer(struct transport *transport, struct child_process *fastimport)
436 {
437 struct child_process *helper = get_helper(transport);
438 struct helper_data *data = transport->data;
439 int cat_blob_fd, code;
440 child_process_init(fastimport);
441 fastimport->in = xdup(helper->out);
442 strvec_push(&fastimport->args, "fast-import");
443 strvec_push(&fastimport->args, "--allow-unsafe-features");
444 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
445
446 if (data->bidi_import) {
447 cat_blob_fd = xdup(helper->in);
448 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
449 }
450 fastimport->git_cmd = 1;
451
452 code = start_command(fastimport);
453 return code;
454 }
455
456 static int get_exporter(struct transport *transport,
457 struct child_process *fastexport,
458 struct string_list *revlist_args)
459 {
460 struct helper_data *data = transport->data;
461 struct child_process *helper = get_helper(transport);
462 int i;
463
464 child_process_init(fastexport);
465
466 /* we need to duplicate helper->in because we want to use it after
467 * fastexport is done with it. */
468 fastexport->out = dup(helper->in);
469 strvec_push(&fastexport->args, "fast-export");
470 strvec_push(&fastexport->args, "--use-done-feature");
471 strvec_push(&fastexport->args, data->signed_tags ?
472 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
473 if (data->export_marks)
474 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
475 if (data->import_marks)
476 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
477
478 for (i = 0; i < revlist_args->nr; i++)
479 strvec_push(&fastexport->args, revlist_args->items[i].string);
480
481 fastexport->git_cmd = 1;
482 return start_command(fastexport);
483 }
484
485 static int fetch_with_import(struct transport *transport,
486 int nr_heads, struct ref **to_fetch)
487 {
488 struct child_process fastimport;
489 struct helper_data *data = transport->data;
490 int i;
491 struct ref *posn;
492 struct strbuf buf = STRBUF_INIT;
493
494 get_helper(transport);
495
496 if (get_importer(transport, &fastimport))
497 die(_("couldn't run fast-import"));
498
499 for (i = 0; i < nr_heads; i++) {
500 posn = to_fetch[i];
501 if (posn->status & REF_STATUS_UPTODATE)
502 continue;
503
504 strbuf_addf(&buf, "import %s\n",
505 posn->symref ? posn->symref : posn->name);
506 sendline(data, &buf);
507 strbuf_reset(&buf);
508 }
509
510 write_constant(data->helper->in, "\n");
511 /*
512 * remote-helpers that advertise the bidi-import capability are required to
513 * buffer the complete batch of import commands until this newline before
514 * sending data to fast-import.
515 * These helpers read back data from fast-import on their stdin, which could
516 * be mixed with import commands, otherwise.
517 */
518
519 if (finish_command(&fastimport))
520 die(_("error while running fast-import"));
521
522 /*
523 * The fast-import stream of a remote helper that advertises
524 * the "refspec" capability writes to the refs named after the
525 * right hand side of the first refspec matching each ref we
526 * were fetching.
527 *
528 * (If no "refspec" capability was specified, for historical
529 * reasons we default to the equivalent of *:*.)
530 *
531 * Store the result in to_fetch[i].old_sha1. Callers such
532 * as "git fetch" can use the value to write feedback to the
533 * terminal, populate FETCH_HEAD, and determine what new value
534 * should be written to peer_ref if the update is a
535 * fast-forward or this is a forced update.
536 */
537 for (i = 0; i < nr_heads; i++) {
538 char *private, *name;
539 posn = to_fetch[i];
540 if (posn->status & REF_STATUS_UPTODATE)
541 continue;
542 name = posn->symref ? posn->symref : posn->name;
543 if (data->rs.nr)
544 private = apply_refspecs(&data->rs, name);
545 else
546 private = xstrdup(name);
547 if (private) {
548 if (read_ref(private, &posn->old_oid) < 0)
549 die(_("could not read ref %s"), private);
550 free(private);
551 }
552 }
553 strbuf_release(&buf);
554 return 0;
555 }
556
557 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
558 {
559 struct helper_data *data = transport->data;
560 int ret = 0;
561 int duped;
562 FILE *input;
563 struct child_process *helper;
564
565 helper = get_helper(transport);
566
567 /*
568 * Yes, dup the pipe another time, as we need unbuffered version
569 * of input pipe as FILE*. fclose() closes the underlying fd and
570 * stream buffering only can be changed before first I/O operation
571 * on it.
572 */
573 duped = dup(helper->out);
574 if (duped < 0)
575 die_errno(_("can't dup helper output fd"));
576 input = xfdopen(duped, "r");
577 setvbuf(input, NULL, _IONBF, 0);
578
579 sendline(data, cmdbuf);
580 if (recvline_fh(input, cmdbuf))
581 exit(128);
582
583 if (!strcmp(cmdbuf->buf, "")) {
584 data->no_disconnect_req = 1;
585 if (debug)
586 fprintf(stderr, "Debug: Smart transport connection "
587 "ready.\n");
588 ret = 1;
589 } else if (!strcmp(cmdbuf->buf, "fallback")) {
590 if (debug)
591 fprintf(stderr, "Debug: Falling back to dumb "
592 "transport.\n");
593 } else {
594 die(_("unknown response to connect: %s"),
595 cmdbuf->buf);
596 }
597
598 fclose(input);
599 return ret;
600 }
601
602 static int process_connect_service(struct transport *transport,
603 const char *name, const char *exec)
604 {
605 struct helper_data *data = transport->data;
606 struct strbuf cmdbuf = STRBUF_INIT;
607 int ret = 0;
608
609 /*
610 * Handle --upload-pack and friends. This is fire and forget...
611 * just warn if it fails.
612 */
613 if (strcmp(name, exec)) {
614 int r = set_helper_option(transport, "servpath", exec);
615 if (r > 0)
616 warning(_("setting remote service path not supported by protocol"));
617 else if (r < 0)
618 warning(_("invalid remote service path"));
619 }
620
621 if (data->connect) {
622 strbuf_addf(&cmdbuf, "connect %s\n", name);
623 ret = run_connect(transport, &cmdbuf);
624 } else if (data->stateless_connect &&
625 (get_protocol_version_config() == protocol_v2) &&
626 !strcmp("git-upload-pack", name)) {
627 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
628 ret = run_connect(transport, &cmdbuf);
629 if (ret)
630 transport->stateless_rpc = 1;
631 }
632
633 strbuf_release(&cmdbuf);
634 return ret;
635 }
636
637 static int process_connect(struct transport *transport,
638 int for_push)
639 {
640 struct helper_data *data = transport->data;
641 const char *name;
642 const char *exec;
643
644 name = for_push ? "git-receive-pack" : "git-upload-pack";
645 if (for_push)
646 exec = data->transport_options.receivepack;
647 else
648 exec = data->transport_options.uploadpack;
649
650 return process_connect_service(transport, name, exec);
651 }
652
653 static int connect_helper(struct transport *transport, const char *name,
654 const char *exec, int fd[2])
655 {
656 struct helper_data *data = transport->data;
657
658 /* Get_helper so connect is inited. */
659 get_helper(transport);
660 if (!data->connect)
661 die(_("operation not supported by protocol"));
662
663 if (!process_connect_service(transport, name, exec))
664 die(_("can't connect to subservice %s"), name);
665
666 fd[0] = data->helper->out;
667 fd[1] = data->helper->in;
668 return 0;
669 }
670
671 static struct ref *get_refs_list_using_list(struct transport *transport,
672 int for_push);
673
674 static int fetch_refs(struct transport *transport,
675 int nr_heads, struct ref **to_fetch)
676 {
677 struct helper_data *data = transport->data;
678 int i, count;
679
680 get_helper(transport);
681
682 if (process_connect(transport, 0)) {
683 do_take_over(transport);
684 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
685 }
686
687 /*
688 * If we reach here, then the server, the client, and/or the transport
689 * helper does not support protocol v2. --negotiate-only requires
690 * protocol v2.
691 */
692 if (data->transport_options.acked_commits) {
693 warning(_("--negotiate-only requires protocol v2"));
694 return -1;
695 }
696
697 if (!data->get_refs_list_called)
698 get_refs_list_using_list(transport, 0);
699
700 count = 0;
701 for (i = 0; i < nr_heads; i++)
702 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
703 count++;
704
705 if (!count)
706 return 0;
707
708 if (data->check_connectivity &&
709 data->transport_options.check_self_contained_and_connected)
710 set_helper_option(transport, "check-connectivity", "true");
711
712 if (transport->cloning)
713 set_helper_option(transport, "cloning", "true");
714
715 if (data->transport_options.update_shallow)
716 set_helper_option(transport, "update-shallow", "true");
717
718 if (data->transport_options.refetch)
719 set_helper_option(transport, "refetch", "true");
720
721 if (data->transport_options.filter_options.choice) {
722 const char *spec = expand_list_objects_filter_spec(
723 &data->transport_options.filter_options);
724 set_helper_option(transport, "filter", spec);
725 }
726
727 if (data->transport_options.negotiation_tips)
728 warning("Ignoring --negotiation-tip because the protocol does not support it.");
729
730 if (data->fetch)
731 return fetch_with_fetch(transport, nr_heads, to_fetch);
732
733 if (data->import)
734 return fetch_with_import(transport, nr_heads, to_fetch);
735
736 return -1;
737 }
738
739 struct push_update_ref_state {
740 struct ref *hint;
741 struct ref_push_report *report;
742 int new_report;
743 };
744
745 static int push_update_ref_status(struct strbuf *buf,
746 struct push_update_ref_state *state,
747 struct ref *remote_refs)
748 {
749 char *refname, *msg;
750 int status, forced = 0;
751
752 if (starts_with(buf->buf, "option ")) {
753 struct object_id old_oid, new_oid;
754 const char *key, *val;
755 char *p;
756
757 if (!state->hint || !(state->report || state->new_report))
758 die(_("'option' without a matching 'ok/error' directive"));
759 if (state->new_report) {
760 if (!state->hint->report) {
761 CALLOC_ARRAY(state->hint->report, 1);
762 state->report = state->hint->report;
763 } else {
764 state->report = state->hint->report;
765 while (state->report->next)
766 state->report = state->report->next;
767 CALLOC_ARRAY(state->report->next, 1);
768 state->report = state->report->next;
769 }
770 state->new_report = 0;
771 }
772 key = buf->buf + 7;
773 p = strchr(key, ' ');
774 if (p)
775 *p++ = '\0';
776 val = p;
777 if (!strcmp(key, "refname"))
778 state->report->ref_name = xstrdup_or_null(val);
779 else if (!strcmp(key, "old-oid") && val &&
780 !parse_oid_hex(val, &old_oid, &val))
781 state->report->old_oid = oiddup(&old_oid);
782 else if (!strcmp(key, "new-oid") && val &&
783 !parse_oid_hex(val, &new_oid, &val))
784 state->report->new_oid = oiddup(&new_oid);
785 else if (!strcmp(key, "forced-update"))
786 state->report->forced_update = 1;
787 /* Not update remote namespace again. */
788 return 1;
789 }
790
791 state->report = NULL;
792 state->new_report = 0;
793
794 if (starts_with(buf->buf, "ok ")) {
795 status = REF_STATUS_OK;
796 refname = buf->buf + 3;
797 } else if (starts_with(buf->buf, "error ")) {
798 status = REF_STATUS_REMOTE_REJECT;
799 refname = buf->buf + 6;
800 } else
801 die(_("expected ok/error, helper said '%s'"), buf->buf);
802
803 msg = strchr(refname, ' ');
804 if (msg) {
805 struct strbuf msg_buf = STRBUF_INIT;
806 const char *end;
807
808 *msg++ = '\0';
809 if (!unquote_c_style(&msg_buf, msg, &end))
810 msg = strbuf_detach(&msg_buf, NULL);
811 else
812 msg = xstrdup(msg);
813 strbuf_release(&msg_buf);
814
815 if (!strcmp(msg, "no match")) {
816 status = REF_STATUS_NONE;
817 FREE_AND_NULL(msg);
818 }
819 else if (!strcmp(msg, "up to date")) {
820 status = REF_STATUS_UPTODATE;
821 FREE_AND_NULL(msg);
822 }
823 else if (!strcmp(msg, "non-fast forward")) {
824 status = REF_STATUS_REJECT_NONFASTFORWARD;
825 FREE_AND_NULL(msg);
826 }
827 else if (!strcmp(msg, "already exists")) {
828 status = REF_STATUS_REJECT_ALREADY_EXISTS;
829 FREE_AND_NULL(msg);
830 }
831 else if (!strcmp(msg, "fetch first")) {
832 status = REF_STATUS_REJECT_FETCH_FIRST;
833 FREE_AND_NULL(msg);
834 }
835 else if (!strcmp(msg, "needs force")) {
836 status = REF_STATUS_REJECT_NEEDS_FORCE;
837 FREE_AND_NULL(msg);
838 }
839 else if (!strcmp(msg, "stale info")) {
840 status = REF_STATUS_REJECT_STALE;
841 FREE_AND_NULL(msg);
842 }
843 else if (!strcmp(msg, "remote ref updated since checkout")) {
844 status = REF_STATUS_REJECT_REMOTE_UPDATED;
845 FREE_AND_NULL(msg);
846 }
847 else if (!strcmp(msg, "forced update")) {
848 forced = 1;
849 FREE_AND_NULL(msg);
850 }
851 else if (!strcmp(msg, "expecting report")) {
852 status = REF_STATUS_EXPECTING_REPORT;
853 FREE_AND_NULL(msg);
854 }
855 }
856
857 if (state->hint)
858 state->hint = find_ref_by_name(state->hint, refname);
859 if (!state->hint)
860 state->hint = find_ref_by_name(remote_refs, refname);
861 if (!state->hint) {
862 warning(_("helper reported unexpected status of %s"), refname);
863 return 1;
864 }
865
866 if (state->hint->status != REF_STATUS_NONE) {
867 /*
868 * Earlier, the ref was marked not to be pushed, so ignore the ref
869 * status reported by the remote helper if the latter is 'no match'.
870 */
871 if (status == REF_STATUS_NONE)
872 return 1;
873 }
874
875 if (status == REF_STATUS_OK)
876 state->new_report = 1;
877 state->hint->status = status;
878 state->hint->forced_update |= forced;
879 state->hint->remote_status = msg;
880 return !(status == REF_STATUS_OK);
881 }
882
883 static int push_update_refs_status(struct helper_data *data,
884 struct ref *remote_refs,
885 int flags)
886 {
887 struct ref *ref;
888 struct ref_push_report *report;
889 struct strbuf buf = STRBUF_INIT;
890 struct push_update_ref_state state = { remote_refs, NULL, 0 };
891
892 for (;;) {
893 if (recvline(data, &buf)) {
894 strbuf_release(&buf);
895 return 1;
896 }
897 if (!buf.len)
898 break;
899 push_update_ref_status(&buf, &state, remote_refs);
900 }
901 strbuf_release(&buf);
902
903 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
904 return 0;
905
906 /* propagate back the update to the remote namespace */
907 for (ref = remote_refs; ref; ref = ref->next) {
908 char *private;
909
910 if (ref->status != REF_STATUS_OK)
911 continue;
912
913 if (!ref->report) {
914 private = apply_refspecs(&data->rs, ref->name);
915 if (!private)
916 continue;
917 update_ref("update by helper", private, &(ref->new_oid),
918 NULL, 0, 0);
919 free(private);
920 } else {
921 for (report = ref->report; report; report = report->next) {
922 private = apply_refspecs(&data->rs,
923 report->ref_name
924 ? report->ref_name
925 : ref->name);
926 if (!private)
927 continue;
928 update_ref("update by helper", private,
929 report->new_oid
930 ? report->new_oid
931 : &(ref->new_oid),
932 NULL, 0, 0);
933 free(private);
934 }
935 }
936 }
937 return 0;
938 }
939
940 static void set_common_push_options(struct transport *transport,
941 const char *name, int flags)
942 {
943 if (flags & TRANSPORT_PUSH_DRY_RUN) {
944 if (set_helper_option(transport, "dry-run", "true") != 0)
945 die(_("helper %s does not support dry-run"), name);
946 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
947 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
948 die(_("helper %s does not support --signed"), name);
949 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
950 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
951 die(_("helper %s does not support --signed=if-asked"), name);
952 }
953
954 if (flags & TRANSPORT_PUSH_ATOMIC)
955 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
956 die(_("helper %s does not support --atomic"), name);
957
958 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
959 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
960 die(_("helper %s does not support --%s"),
961 name, TRANS_OPT_FORCE_IF_INCLUDES);
962
963 if (flags & TRANSPORT_PUSH_OPTIONS) {
964 struct string_list_item *item;
965 for_each_string_list_item(item, transport->push_options)
966 if (set_helper_option(transport, "push-option", item->string) != 0)
967 die(_("helper %s does not support 'push-option'"), name);
968 }
969 }
970
971 static int push_refs_with_push(struct transport *transport,
972 struct ref *remote_refs, int flags)
973 {
974 int force_all = flags & TRANSPORT_PUSH_FORCE;
975 int mirror = flags & TRANSPORT_PUSH_MIRROR;
976 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
977 struct helper_data *data = transport->data;
978 struct strbuf buf = STRBUF_INIT;
979 struct ref *ref;
980 struct string_list cas_options = STRING_LIST_INIT_DUP;
981 struct string_list_item *cas_option;
982
983 get_helper(transport);
984 if (!data->push)
985 return 1;
986
987 for (ref = remote_refs; ref; ref = ref->next) {
988 if (!ref->peer_ref && !mirror)
989 continue;
990
991 /* Check for statuses set by set_ref_status_for_push() */
992 switch (ref->status) {
993 case REF_STATUS_REJECT_NONFASTFORWARD:
994 case REF_STATUS_REJECT_STALE:
995 case REF_STATUS_REJECT_ALREADY_EXISTS:
996 case REF_STATUS_REJECT_REMOTE_UPDATED:
997 if (atomic) {
998 reject_atomic_push(remote_refs, mirror);
999 string_list_clear(&cas_options, 0);
1000 return 0;
1001 } else
1002 continue;
1003 case REF_STATUS_UPTODATE:
1004 continue;
1005 default:
1006 ; /* do nothing */
1007 }
1008
1009 if (force_all)
1010 ref->force = 1;
1011
1012 strbuf_addstr(&buf, "push ");
1013 if (!ref->deletion) {
1014 if (ref->force)
1015 strbuf_addch(&buf, '+');
1016 if (ref->peer_ref)
1017 strbuf_addstr(&buf, ref->peer_ref->name);
1018 else
1019 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1020 }
1021 strbuf_addch(&buf, ':');
1022 strbuf_addstr(&buf, ref->name);
1023 strbuf_addch(&buf, '\n');
1024
1025 /*
1026 * The "--force-with-lease" options without explicit
1027 * values to expect have already been expanded into
1028 * the ref->old_oid_expect[] field; we can ignore
1029 * transport->smart_options->cas altogether and instead
1030 * can enumerate them from the refs.
1031 */
1032 if (ref->expect_old_sha1) {
1033 struct strbuf cas = STRBUF_INIT;
1034 strbuf_addf(&cas, "%s:%s",
1035 ref->name, oid_to_hex(&ref->old_oid_expect));
1036 string_list_append_nodup(&cas_options,
1037 strbuf_detach(&cas, NULL));
1038 }
1039 }
1040 if (buf.len == 0) {
1041 string_list_clear(&cas_options, 0);
1042 return 0;
1043 }
1044
1045 for_each_string_list_item(cas_option, &cas_options)
1046 set_helper_option(transport, "cas", cas_option->string);
1047 set_common_push_options(transport, data->name, flags);
1048
1049 strbuf_addch(&buf, '\n');
1050 sendline(data, &buf);
1051 strbuf_release(&buf);
1052 string_list_clear(&cas_options, 0);
1053
1054 return push_update_refs_status(data, remote_refs, flags);
1055 }
1056
1057 static int push_refs_with_export(struct transport *transport,
1058 struct ref *remote_refs, int flags)
1059 {
1060 struct ref *ref;
1061 struct child_process *helper, exporter;
1062 struct helper_data *data = transport->data;
1063 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1064 struct strbuf buf = STRBUF_INIT;
1065
1066 if (!data->rs.nr)
1067 die(_("remote-helper doesn't support push; refspec needed"));
1068
1069 set_common_push_options(transport, data->name, flags);
1070 if (flags & TRANSPORT_PUSH_FORCE) {
1071 if (set_helper_option(transport, "force", "true") != 0)
1072 warning(_("helper %s does not support 'force'"), data->name);
1073 }
1074
1075 helper = get_helper(transport);
1076
1077 write_constant(helper->in, "export\n");
1078
1079 for (ref = remote_refs; ref; ref = ref->next) {
1080 char *private;
1081 struct object_id oid;
1082
1083 private = apply_refspecs(&data->rs, ref->name);
1084 if (private && !get_oid(private, &oid)) {
1085 strbuf_addf(&buf, "^%s", private);
1086 string_list_append_nodup(&revlist_args,
1087 strbuf_detach(&buf, NULL));
1088 oidcpy(&ref->old_oid, &oid);
1089 }
1090 free(private);
1091
1092 if (ref->peer_ref) {
1093 if (strcmp(ref->name, ref->peer_ref->name)) {
1094 if (!ref->deletion) {
1095 const char *name;
1096 int flag;
1097
1098 /* Follow symbolic refs (mainly for HEAD). */
1099 name = resolve_ref_unsafe(ref->peer_ref->name,
1100 RESOLVE_REF_READING,
1101 &oid, &flag);
1102 if (!name || !(flag & REF_ISSYMREF))
1103 name = ref->peer_ref->name;
1104
1105 strbuf_addf(&buf, "%s:%s", name, ref->name);
1106 } else
1107 strbuf_addf(&buf, ":%s", ref->name);
1108
1109 string_list_append(&revlist_args, "--refspec");
1110 string_list_append(&revlist_args, buf.buf);
1111 strbuf_release(&buf);
1112 }
1113 if (!ref->deletion)
1114 string_list_append(&revlist_args, ref->peer_ref->name);
1115 }
1116 }
1117
1118 if (get_exporter(transport, &exporter, &revlist_args))
1119 die(_("couldn't run fast-export"));
1120
1121 string_list_clear(&revlist_args, 1);
1122
1123 if (finish_command(&exporter))
1124 die(_("error while running fast-export"));
1125 if (push_update_refs_status(data, remote_refs, flags))
1126 return 1;
1127
1128 if (data->export_marks) {
1129 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1130 rename(buf.buf, data->export_marks);
1131 strbuf_release(&buf);
1132 }
1133
1134 return 0;
1135 }
1136
1137 static int push_refs(struct transport *transport,
1138 struct ref *remote_refs, int flags)
1139 {
1140 struct helper_data *data = transport->data;
1141
1142 if (process_connect(transport, 1)) {
1143 do_take_over(transport);
1144 return transport->vtable->push_refs(transport, remote_refs, flags);
1145 }
1146
1147 if (!remote_refs) {
1148 fprintf(stderr,
1149 _("No refs in common and none specified; doing nothing.\n"
1150 "Perhaps you should specify a branch.\n"));
1151 return 0;
1152 }
1153
1154 if (data->push)
1155 return push_refs_with_push(transport, remote_refs, flags);
1156
1157 if (data->export)
1158 return push_refs_with_export(transport, remote_refs, flags);
1159
1160 return -1;
1161 }
1162
1163
1164 static int has_attribute(const char *attrs, const char *attr)
1165 {
1166 int len;
1167 if (!attrs)
1168 return 0;
1169
1170 len = strlen(attr);
1171 for (;;) {
1172 const char *space = strchrnul(attrs, ' ');
1173 if (len == space - attrs && !strncmp(attrs, attr, len))
1174 return 1;
1175 if (!*space)
1176 return 0;
1177 attrs = space + 1;
1178 }
1179 }
1180
1181 static struct ref *get_refs_list(struct transport *transport, int for_push,
1182 struct transport_ls_refs_options *transport_options)
1183 {
1184 get_helper(transport);
1185
1186 if (process_connect(transport, for_push)) {
1187 do_take_over(transport);
1188 return transport->vtable->get_refs_list(transport, for_push,
1189 transport_options);
1190 }
1191
1192 return get_refs_list_using_list(transport, for_push);
1193 }
1194
1195 static struct ref *get_refs_list_using_list(struct transport *transport,
1196 int for_push)
1197 {
1198 struct helper_data *data = transport->data;
1199 struct child_process *helper;
1200 struct ref *ret = NULL;
1201 struct ref **tail = &ret;
1202 struct ref *posn;
1203 struct strbuf buf = STRBUF_INIT;
1204
1205 data->get_refs_list_called = 1;
1206 helper = get_helper(transport);
1207
1208 if (data->object_format) {
1209 write_str_in_full(helper->in, "option object-format\n");
1210 if (recvline(data, &buf) || strcmp(buf.buf, "ok"))
1211 exit(128);
1212 }
1213
1214 if (data->push && for_push)
1215 write_str_in_full(helper->in, "list for-push\n");
1216 else
1217 write_str_in_full(helper->in, "list\n");
1218
1219 while (1) {
1220 char *eov, *eon;
1221 if (recvline(data, &buf))
1222 exit(128);
1223
1224 if (!*buf.buf)
1225 break;
1226 else if (buf.buf[0] == ':') {
1227 const char *value;
1228 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1229 int algo = hash_algo_by_name(value);
1230 if (algo == GIT_HASH_UNKNOWN)
1231 die(_("unsupported object format '%s'"),
1232 value);
1233 transport->hash_algo = &hash_algos[algo];
1234 }
1235 continue;
1236 }
1237
1238 eov = strchr(buf.buf, ' ');
1239 if (!eov)
1240 die(_("malformed response in ref list: %s"), buf.buf);
1241 eon = strchr(eov + 1, ' ');
1242 *eov = '\0';
1243 if (eon)
1244 *eon = '\0';
1245 *tail = alloc_ref(eov + 1);
1246 if (buf.buf[0] == '@')
1247 (*tail)->symref = xstrdup(buf.buf + 1);
1248 else if (buf.buf[0] != '?')
1249 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1250 if (eon) {
1251 if (has_attribute(eon + 1, "unchanged")) {
1252 (*tail)->status |= REF_STATUS_UPTODATE;
1253 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
1254 die(_("could not read ref %s"),
1255 (*tail)->name);
1256 }
1257 }
1258 tail = &((*tail)->next);
1259 }
1260 if (debug)
1261 fprintf(stderr, "Debug: Read ref listing.\n");
1262 strbuf_release(&buf);
1263
1264 for (posn = ret; posn; posn = posn->next)
1265 resolve_remote_symref(posn, ret);
1266
1267 return ret;
1268 }
1269
1270 static struct transport_vtable vtable = {
1271 .set_option = set_helper_option,
1272 .get_refs_list = get_refs_list,
1273 .fetch_refs = fetch_refs,
1274 .push_refs = push_refs,
1275 .connect = connect_helper,
1276 .disconnect = release_helper
1277 };
1278
1279 int transport_helper_init(struct transport *transport, const char *name)
1280 {
1281 struct helper_data *data = xcalloc(1, sizeof(*data));
1282 data->name = name;
1283
1284 transport_check_allowed(name);
1285
1286 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1287 debug = 1;
1288
1289 list_objects_filter_init(&data->transport_options.filter_options);
1290
1291 transport->data = data;
1292 transport->vtable = &vtable;
1293 transport->smart_options = &(data->transport_options);
1294 return 0;
1295 }
1296
1297 /*
1298 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1299 * buffer less), so attempt reads and writes with up to that size.
1300 */
1301 #define BUFFERSIZE 65536
1302 /* This should be enough to hold debugging message. */
1303 #define PBUFFERSIZE 8192
1304
1305 /* Print bidirectional transfer loop debug message. */
1306 __attribute__((format (printf, 1, 2)))
1307 static void transfer_debug(const char *fmt, ...)
1308 {
1309 /*
1310 * NEEDSWORK: This function is sometimes used from multiple threads, and
1311 * we end up using debug_enabled racily. That "should not matter" since
1312 * we always write the same value, but it's still wrong. This function
1313 * is listed in .tsan-suppressions for the time being.
1314 */
1315
1316 va_list args;
1317 char msgbuf[PBUFFERSIZE];
1318 static int debug_enabled = -1;
1319
1320 if (debug_enabled < 0)
1321 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1322 if (!debug_enabled)
1323 return;
1324
1325 va_start(args, fmt);
1326 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1327 va_end(args);
1328 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1329 }
1330
1331 /* Stream state: More data may be coming in this direction. */
1332 #define SSTATE_TRANSFERRING 0
1333 /*
1334 * Stream state: No more data coming in this direction, flushing rest of
1335 * data.
1336 */
1337 #define SSTATE_FLUSHING 1
1338 /* Stream state: Transfer in this direction finished. */
1339 #define SSTATE_FINISHED 2
1340
1341 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1342 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1343 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1344
1345 /* Unidirectional transfer. */
1346 struct unidirectional_transfer {
1347 /* Source */
1348 int src;
1349 /* Destination */
1350 int dest;
1351 /* Is source socket? */
1352 int src_is_sock;
1353 /* Is destination socket? */
1354 int dest_is_sock;
1355 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1356 int state;
1357 /* Buffer. */
1358 char buf[BUFFERSIZE];
1359 /* Buffer used. */
1360 size_t bufuse;
1361 /* Name of source. */
1362 const char *src_name;
1363 /* Name of destination. */
1364 const char *dest_name;
1365 };
1366
1367 /* Closes the target (for writing) if transfer has finished. */
1368 static void udt_close_if_finished(struct unidirectional_transfer *t)
1369 {
1370 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1371 t->state = SSTATE_FINISHED;
1372 if (t->dest_is_sock)
1373 shutdown(t->dest, SHUT_WR);
1374 else
1375 close(t->dest);
1376 transfer_debug("Closed %s.", t->dest_name);
1377 }
1378 }
1379
1380 /*
1381 * Tries to read data from source into buffer. If buffer is full,
1382 * no data is read. Returns 0 on success, -1 on error.
1383 */
1384 static int udt_do_read(struct unidirectional_transfer *t)
1385 {
1386 ssize_t bytes;
1387
1388 if (t->bufuse == BUFFERSIZE)
1389 return 0; /* No space for more. */
1390
1391 transfer_debug("%s is readable", t->src_name);
1392 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1393 if (bytes < 0) {
1394 error_errno(_("read(%s) failed"), t->src_name);
1395 return -1;
1396 } else if (bytes == 0) {
1397 transfer_debug("%s EOF (with %i bytes in buffer)",
1398 t->src_name, (int)t->bufuse);
1399 t->state = SSTATE_FLUSHING;
1400 } else if (bytes > 0) {
1401 t->bufuse += bytes;
1402 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1403 (int)bytes, t->src_name, (int)t->bufuse);
1404 }
1405 return 0;
1406 }
1407
1408 /* Tries to write data from buffer into destination. If buffer is empty,
1409 * no data is written. Returns 0 on success, -1 on error.
1410 */
1411 static int udt_do_write(struct unidirectional_transfer *t)
1412 {
1413 ssize_t bytes;
1414
1415 if (t->bufuse == 0)
1416 return 0; /* Nothing to write. */
1417
1418 transfer_debug("%s is writable", t->dest_name);
1419 bytes = xwrite(t->dest, t->buf, t->bufuse);
1420 if (bytes < 0) {
1421 error_errno(_("write(%s) failed"), t->dest_name);
1422 return -1;
1423 } else if (bytes > 0) {
1424 t->bufuse -= bytes;
1425 if (t->bufuse)
1426 memmove(t->buf, t->buf + bytes, t->bufuse);
1427 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1428 (int)bytes, t->dest_name, (int)t->bufuse);
1429 }
1430 return 0;
1431 }
1432
1433
1434 /* State of bidirectional transfer loop. */
1435 struct bidirectional_transfer_state {
1436 /* Direction from program to git. */
1437 struct unidirectional_transfer ptg;
1438 /* Direction from git to program. */
1439 struct unidirectional_transfer gtp;
1440 };
1441
1442 static void *udt_copy_task_routine(void *udt)
1443 {
1444 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1445 while (t->state != SSTATE_FINISHED) {
1446 if (STATE_NEEDS_READING(t->state))
1447 if (udt_do_read(t))
1448 return NULL;
1449 if (STATE_NEEDS_WRITING(t->state))
1450 if (udt_do_write(t))
1451 return NULL;
1452 if (STATE_NEEDS_CLOSING(t->state))
1453 udt_close_if_finished(t);
1454 }
1455 return udt; /* Just some non-NULL value. */
1456 }
1457
1458 #ifndef NO_PTHREADS
1459
1460 /*
1461 * Join thread, with appropriate errors on failure. Name is name for the
1462 * thread (for error messages). Returns 0 on success, 1 on failure.
1463 */
1464 static int tloop_join(pthread_t thread, const char *name)
1465 {
1466 int err;
1467 void *tret;
1468 err = pthread_join(thread, &tret);
1469 if (!tret) {
1470 error(_("%s thread failed"), name);
1471 return 1;
1472 }
1473 if (err) {
1474 error(_("%s thread failed to join: %s"), name, strerror(err));
1475 return 1;
1476 }
1477 return 0;
1478 }
1479
1480 /*
1481 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1482 * -1 on failure.
1483 */
1484 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1485 {
1486 pthread_t gtp_thread;
1487 pthread_t ptg_thread;
1488 int err;
1489 int ret = 0;
1490 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1491 &s->gtp);
1492 if (err)
1493 die(_("can't start thread for copying data: %s"), strerror(err));
1494 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1495 &s->ptg);
1496 if (err)
1497 die(_("can't start thread for copying data: %s"), strerror(err));
1498
1499 ret |= tloop_join(gtp_thread, "Git to program copy");
1500 ret |= tloop_join(ptg_thread, "Program to git copy");
1501 return ret;
1502 }
1503 #else
1504
1505 /* Close the source and target (for writing) for transfer. */
1506 static void udt_kill_transfer(struct unidirectional_transfer *t)
1507 {
1508 t->state = SSTATE_FINISHED;
1509 /*
1510 * Socket read end left open isn't a disaster if nobody
1511 * attempts to read from it (mingw compat headers do not
1512 * have SHUT_RD)...
1513 *
1514 * We can't fully close the socket since otherwise gtp
1515 * task would first close the socket it sends data to
1516 * while closing the ptg file descriptors.
1517 */
1518 if (!t->src_is_sock)
1519 close(t->src);
1520 if (t->dest_is_sock)
1521 shutdown(t->dest, SHUT_WR);
1522 else
1523 close(t->dest);
1524 }
1525
1526 /*
1527 * Join process, with appropriate errors on failure. Name is name for the
1528 * process (for error messages). Returns 0 on success, 1 on failure.
1529 */
1530 static int tloop_join(pid_t pid, const char *name)
1531 {
1532 int tret;
1533 if (waitpid(pid, &tret, 0) < 0) {
1534 error_errno(_("%s process failed to wait"), name);
1535 return 1;
1536 }
1537 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1538 error(_("%s process failed"), name);
1539 return 1;
1540 }
1541 return 0;
1542 }
1543
1544 /*
1545 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1546 * -1 on failure.
1547 */
1548 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1549 {
1550 pid_t pid1, pid2;
1551 int ret = 0;
1552
1553 /* Fork thread #1: git to program. */
1554 pid1 = fork();
1555 if (pid1 < 0)
1556 die_errno(_("can't start thread for copying data"));
1557 else if (pid1 == 0) {
1558 udt_kill_transfer(&s->ptg);
1559 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1560 }
1561
1562 /* Fork thread #2: program to git. */
1563 pid2 = fork();
1564 if (pid2 < 0)
1565 die_errno(_("can't start thread for copying data"));
1566 else if (pid2 == 0) {
1567 udt_kill_transfer(&s->gtp);
1568 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1569 }
1570
1571 /*
1572 * Close both streams in parent as to not interfere with
1573 * end of file detection and wait for both tasks to finish.
1574 */
1575 udt_kill_transfer(&s->gtp);
1576 udt_kill_transfer(&s->ptg);
1577 ret |= tloop_join(pid1, "Git to program copy");
1578 ret |= tloop_join(pid2, "Program to git copy");
1579 return ret;
1580 }
1581 #endif
1582
1583 /*
1584 * Copies data from stdin to output and from input to stdout simultaneously.
1585 * Additionally filtering through given filter. If filter is NULL, uses
1586 * identity filter.
1587 */
1588 int bidirectional_transfer_loop(int input, int output)
1589 {
1590 struct bidirectional_transfer_state state;
1591
1592 /* Fill the state fields. */
1593 state.ptg.src = input;
1594 state.ptg.dest = 1;
1595 state.ptg.src_is_sock = (input == output);
1596 state.ptg.dest_is_sock = 0;
1597 state.ptg.state = SSTATE_TRANSFERRING;
1598 state.ptg.bufuse = 0;
1599 state.ptg.src_name = "remote input";
1600 state.ptg.dest_name = "stdout";
1601
1602 state.gtp.src = 0;
1603 state.gtp.dest = output;
1604 state.gtp.src_is_sock = 0;
1605 state.gtp.dest_is_sock = (input == output);
1606 state.gtp.state = SSTATE_TRANSFERRING;
1607 state.gtp.bufuse = 0;
1608 state.gtp.src_name = "stdin";
1609 state.gtp.dest_name = "remote output";
1610
1611 return tloop_spawnwait_tasks(&state);
1612 }
1613
1614 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1615 {
1616 struct ref *ref;
1617
1618 /* Mark other refs as failed */
1619 for (ref = remote_refs; ref; ref = ref->next) {
1620 if (!ref->peer_ref && !mirror_mode)
1621 continue;
1622
1623 switch (ref->status) {
1624 case REF_STATUS_NONE:
1625 case REF_STATUS_OK:
1626 case REF_STATUS_EXPECTING_REPORT:
1627 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1628 continue;
1629 default:
1630 break; /* do nothing */
1631 }
1632 }
1633 return;
1634 }