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Merge branch 'jc/reflog-expire-lookup-commit-fix' into maint-2.46
[git/gitster.git] / transport-helper.c
blob09b3560ffdc41e52eff6fdc049222a802ef9ee46
1 #define USE_THE_REPOSITORY_VARIABLE
2
3 #include "git-compat-util.h"
4 #include "transport.h"
5 #include "quote.h"
6 #include "run-command.h"
7 #include "commit.h"
8 #include "environment.h"
9 #include "gettext.h"
10 #include "hex.h"
11 #include "object-name.h"
12 #include "repository.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 #include "packfile.h"
23
24 static int debug;
25
26 struct helper_data {
27 char *name;
28 struct child_process *helper;
29 FILE *out;
30 unsigned fetch : 1,
31 import : 1,
32 bidi_import : 1,
33 export : 1,
34 option : 1,
35 push : 1,
36 connect : 1,
37 stateless_connect : 1,
38 signed_tags : 1,
39 check_connectivity : 1,
40 no_disconnect_req : 1,
41 no_private_update : 1,
42 object_format : 1;
43
44 /*
45 * As an optimization, the transport code may invoke fetch before
46 * get_refs_list. If this happens, and if the transport helper doesn't
47 * support connect or stateless_connect, we need to invoke
48 * get_refs_list ourselves if we haven't already done so. Keep track of
49 * whether we have invoked get_refs_list.
50 */
51 unsigned get_refs_list_called : 1;
52
53 char *export_marks;
54 char *import_marks;
55 /* These go from remote name (as in "list") to private name */
56 struct refspec rs;
57 /* Transport options for fetch-pack/send-pack (should one of
58 * those be invoked).
59 */
60 struct git_transport_options transport_options;
61 };
62
63 static void sendline(struct helper_data *helper, struct strbuf *buffer)
64 {
65 if (debug)
66 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
67 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
68 die_errno(_("full write to remote helper failed"));
69 }
70
71 static int recvline_fh(FILE *helper, struct strbuf *buffer)
72 {
73 strbuf_reset(buffer);
74 if (debug)
75 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
76 if (strbuf_getline(buffer, helper) == EOF) {
77 if (debug)
78 fprintf(stderr, "Debug: Remote helper quit.\n");
79 return 1;
80 }
81
82 if (debug)
83 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
84 return 0;
85 }
86
87 static int recvline(struct helper_data *helper, struct strbuf *buffer)
88 {
89 return recvline_fh(helper->out, buffer);
90 }
91
92 static void write_constant(int fd, const char *str)
93 {
94 if (debug)
95 fprintf(stderr, "Debug: Remote helper: -> %s", str);
96 if (write_in_full(fd, str, strlen(str)) < 0)
97 die_errno(_("full write to remote helper failed"));
98 }
99
100 static const char *remove_ext_force(const char *url)
101 {
102 if (url) {
103 const char *colon = strchr(url, ':');
104 if (colon && colon[1] == ':')
105 return colon + 2;
106 }
107 return url;
108 }
109
110 static void do_take_over(struct transport *transport)
111 {
112 struct helper_data *data;
113 data = (struct helper_data *)transport->data;
114 transport_take_over(transport, data->helper);
115 fclose(data->out);
116 free(data->name);
117 free(data);
118 }
119
120 static void standard_options(struct transport *t);
121
122 static struct child_process *get_helper(struct transport *transport)
123 {
124 struct helper_data *data = transport->data;
125 struct strbuf buf = STRBUF_INIT;
126 struct child_process *helper;
127 int duped;
128 int code;
129
130 if (data->helper)
131 return data->helper;
132
133 helper = xmalloc(sizeof(*helper));
134 child_process_init(helper);
135 helper->in = -1;
136 helper->out = -1;
137 helper->err = 0;
138 strvec_pushf(&helper->args, "remote-%s", data->name);
139 strvec_push(&helper->args, transport->remote->name);
140 strvec_push(&helper->args, remove_ext_force(transport->url));
141 helper->git_cmd = 1;
142 helper->silent_exec_failure = 1;
143
144 if (have_git_dir())
145 strvec_pushf(&helper->env, "%s=%s",
146 GIT_DIR_ENVIRONMENT, get_git_dir());
147
148 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
149
150 code = start_command(helper);
151 if (code < 0 && errno == ENOENT)
152 die(_("unable to find remote helper for '%s'"), data->name);
153 else if (code != 0)
154 exit(code);
155
156 data->helper = helper;
157 data->no_disconnect_req = 0;
158 refspec_init(&data->rs, REFSPEC_FETCH);
159
160 /*
161 * Open the output as FILE* so strbuf_getline_*() family of
162 * functions can be used.
163 * Do this with duped fd because fclose() will close the fd,
164 * and stuff like taking over will require the fd to remain.
165 */
166 duped = dup(helper->out);
167 if (duped < 0)
168 die_errno(_("can't dup helper output fd"));
169 data->out = xfdopen(duped, "r");
170
171 write_constant(helper->in, "capabilities\n");
172
173 while (1) {
174 const char *capname, *arg;
175 int mandatory = 0;
176 if (recvline(data, &buf))
177 exit(128);
178
179 if (!*buf.buf)
180 break;
181
182 if (*buf.buf == '*') {
183 capname = buf.buf + 1;
184 mandatory = 1;
185 } else
186 capname = buf.buf;
187
188 if (debug)
189 fprintf(stderr, "Debug: Got cap %s\n", capname);
190 if (!strcmp(capname, "fetch"))
191 data->fetch = 1;
192 else if (!strcmp(capname, "option"))
193 data->option = 1;
194 else if (!strcmp(capname, "push"))
195 data->push = 1;
196 else if (!strcmp(capname, "import"))
197 data->import = 1;
198 else if (!strcmp(capname, "bidi-import"))
199 data->bidi_import = 1;
200 else if (!strcmp(capname, "export"))
201 data->export = 1;
202 else if (!strcmp(capname, "check-connectivity"))
203 data->check_connectivity = 1;
204 else if (skip_prefix(capname, "refspec ", &arg)) {
205 refspec_append(&data->rs, arg);
206 } else if (!strcmp(capname, "connect")) {
207 data->connect = 1;
208 } else if (!strcmp(capname, "stateless-connect")) {
209 data->stateless_connect = 1;
210 } else if (!strcmp(capname, "signed-tags")) {
211 data->signed_tags = 1;
212 } else if (skip_prefix(capname, "export-marks ", &arg)) {
213 data->export_marks = xstrdup(arg);
214 } else if (skip_prefix(capname, "import-marks ", &arg)) {
215 data->import_marks = xstrdup(arg);
216 } else if (starts_with(capname, "no-private-update")) {
217 data->no_private_update = 1;
218 } else if (starts_with(capname, "object-format")) {
219 data->object_format = 1;
220 } else if (mandatory) {
221 die(_("unknown mandatory capability %s; this remote "
222 "helper probably needs newer version of Git"),
223 capname);
224 }
225 }
226 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
227 warning(_("this remote helper should implement refspec capability"));
228 }
229 strbuf_release(&buf);
230 if (debug)
231 fprintf(stderr, "Debug: Capabilities complete.\n");
232 standard_options(transport);
233 return data->helper;
234 }
235
236 static int disconnect_helper(struct transport *transport)
237 {
238 struct helper_data *data = transport->data;
239 int res = 0;
240
241 if (data->helper) {
242 if (debug)
243 fprintf(stderr, "Debug: Disconnecting.\n");
244 if (!data->no_disconnect_req) {
245 /*
246 * Ignore write errors; there's nothing we can do,
247 * since we're about to close the pipe anyway. And the
248 * most likely error is EPIPE due to the helper dying
249 * to report an error itself.
250 */
251 sigchain_push(SIGPIPE, SIG_IGN);
252 xwrite(data->helper->in, "\n", 1);
253 sigchain_pop(SIGPIPE);
254 }
255 close(data->helper->in);
256 close(data->helper->out);
257 fclose(data->out);
258 res = finish_command(data->helper);
259 FREE_AND_NULL(data->name);
260 FREE_AND_NULL(data->helper);
261 }
262 return res;
263 }
264
265 static const char *unsupported_options[] = {
266 TRANS_OPT_UPLOADPACK,
267 TRANS_OPT_RECEIVEPACK,
268 TRANS_OPT_THIN,
269 TRANS_OPT_KEEP
270 };
271
272 static const char *boolean_options[] = {
273 TRANS_OPT_THIN,
274 TRANS_OPT_KEEP,
275 TRANS_OPT_FOLLOWTAGS,
276 TRANS_OPT_DEEPEN_RELATIVE
277 };
278
279 static int strbuf_set_helper_option(struct helper_data *data,
280 struct strbuf *buf)
281 {
282 int ret;
283
284 sendline(data, buf);
285 if (recvline(data, buf))
286 exit(128);
287
288 if (!strcmp(buf->buf, "ok"))
289 ret = 0;
290 else if (starts_with(buf->buf, "error"))
291 ret = -1;
292 else if (!strcmp(buf->buf, "unsupported"))
293 ret = 1;
294 else {
295 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
296 ret = 1;
297 }
298 return ret;
299 }
300
301 static int string_list_set_helper_option(struct helper_data *data,
302 const char *name,
303 struct string_list *list)
304 {
305 struct strbuf buf = STRBUF_INIT;
306 int i, ret = 0;
307
308 for (i = 0; i < list->nr; i++) {
309 strbuf_addf(&buf, "option %s ", name);
310 quote_c_style(list->items[i].string, &buf, NULL, 0);
311 strbuf_addch(&buf, '\n');
312
313 if ((ret = strbuf_set_helper_option(data, &buf)))
314 break;
315 strbuf_reset(&buf);
316 }
317 strbuf_release(&buf);
318 return ret;
319 }
320
321 static int set_helper_option(struct transport *transport,
322 const char *name, const char *value)
323 {
324 struct helper_data *data = transport->data;
325 struct strbuf buf = STRBUF_INIT;
326 int i, ret, is_bool = 0;
327
328 get_helper(transport);
329
330 if (!data->option)
331 return 1;
332
333 if (!strcmp(name, "deepen-not"))
334 return string_list_set_helper_option(data, name,
335 (struct string_list *)value);
336
337 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
338 if (!strcmp(name, unsupported_options[i]))
339 return 1;
340 }
341
342 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
343 if (!strcmp(name, boolean_options[i])) {
344 is_bool = 1;
345 break;
346 }
347 }
348
349 strbuf_addf(&buf, "option %s ", name);
350 if (is_bool)
351 strbuf_addstr(&buf, value ? "true" : "false");
352 else
353 quote_c_style(value, &buf, NULL, 0);
354 strbuf_addch(&buf, '\n');
355
356 ret = strbuf_set_helper_option(data, &buf);
357 strbuf_release(&buf);
358 return ret;
359 }
360
361 static void standard_options(struct transport *t)
362 {
363 char buf[16];
364 int v = t->verbose;
365
366 set_helper_option(t, "progress", t->progress ? "true" : "false");
367
368 xsnprintf(buf, sizeof(buf), "%d", v + 1);
369 set_helper_option(t, "verbosity", buf);
370
371 switch (t->family) {
372 case TRANSPORT_FAMILY_ALL:
373 /*
374 * this is already the default,
375 * do not break old remote helpers by setting "all" here
376 */
377 break;
378 case TRANSPORT_FAMILY_IPV4:
379 set_helper_option(t, "family", "ipv4");
380 break;
381 case TRANSPORT_FAMILY_IPV6:
382 set_helper_option(t, "family", "ipv6");
383 break;
384 }
385 }
386
387 static int release_helper(struct transport *transport)
388 {
389 int res = 0;
390 struct helper_data *data = transport->data;
391 refspec_clear(&data->rs);
392 res = disconnect_helper(transport);
393 free(transport->data);
394 return res;
395 }
396
397 static int fetch_with_fetch(struct transport *transport,
398 int nr_heads, struct ref **to_fetch)
399 {
400 struct helper_data *data = transport->data;
401 int i;
402 struct strbuf buf = STRBUF_INIT;
403
404 for (i = 0; i < nr_heads; i++) {
405 const struct ref *posn = to_fetch[i];
406 if (posn->status & REF_STATUS_UPTODATE)
407 continue;
408
409 strbuf_addf(&buf, "fetch %s %s\n",
410 oid_to_hex(&posn->old_oid),
411 posn->symref ? posn->symref : posn->name);
412 }
413
414 strbuf_addch(&buf, '\n');
415 sendline(data, &buf);
416
417 while (1) {
418 const char *name;
419
420 if (recvline(data, &buf))
421 exit(128);
422
423 if (skip_prefix(buf.buf, "lock ", &name)) {
424 if (transport->pack_lockfiles.nr)
425 warning(_("%s also locked %s"), data->name, name);
426 else
427 string_list_append(&transport->pack_lockfiles,
428 name);
429 }
430 else if (data->check_connectivity &&
431 data->transport_options.check_self_contained_and_connected &&
432 !strcmp(buf.buf, "connectivity-ok"))
433 data->transport_options.self_contained_and_connected = 1;
434 else if (!buf.len)
435 break;
436 else
437 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
438 }
439 strbuf_release(&buf);
440
441 reprepare_packed_git(the_repository);
442 return 0;
443 }
444
445 static int get_importer(struct transport *transport, struct child_process *fastimport)
446 {
447 struct child_process *helper = get_helper(transport);
448 struct helper_data *data = transport->data;
449 int cat_blob_fd, code;
450 child_process_init(fastimport);
451 fastimport->in = xdup(helper->out);
452 strvec_push(&fastimport->args, "fast-import");
453 strvec_push(&fastimport->args, "--allow-unsafe-features");
454 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
455
456 if (data->bidi_import) {
457 cat_blob_fd = xdup(helper->in);
458 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
459 }
460 fastimport->git_cmd = 1;
461
462 code = start_command(fastimport);
463 return code;
464 }
465
466 static int get_exporter(struct transport *transport,
467 struct child_process *fastexport,
468 struct string_list *revlist_args)
469 {
470 struct helper_data *data = transport->data;
471 struct child_process *helper = get_helper(transport);
472 int i;
473
474 child_process_init(fastexport);
475
476 /* we need to duplicate helper->in because we want to use it after
477 * fastexport is done with it. */
478 fastexport->out = dup(helper->in);
479 strvec_push(&fastexport->args, "fast-export");
480 strvec_push(&fastexport->args, "--use-done-feature");
481 strvec_push(&fastexport->args, data->signed_tags ?
482 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
483 if (data->export_marks)
484 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
485 if (data->import_marks)
486 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
487
488 for (i = 0; i < revlist_args->nr; i++)
489 strvec_push(&fastexport->args, revlist_args->items[i].string);
490
491 fastexport->git_cmd = 1;
492 return start_command(fastexport);
493 }
494
495 static int fetch_with_import(struct transport *transport,
496 int nr_heads, struct ref **to_fetch)
497 {
498 struct child_process fastimport;
499 struct helper_data *data = transport->data;
500 int i;
501 struct ref *posn;
502 struct strbuf buf = STRBUF_INIT;
503
504 get_helper(transport);
505
506 if (get_importer(transport, &fastimport))
507 die(_("couldn't run fast-import"));
508
509 for (i = 0; i < nr_heads; i++) {
510 posn = to_fetch[i];
511 if (posn->status & REF_STATUS_UPTODATE)
512 continue;
513
514 strbuf_addf(&buf, "import %s\n",
515 posn->symref ? posn->symref : posn->name);
516 sendline(data, &buf);
517 strbuf_reset(&buf);
518 }
519
520 write_constant(data->helper->in, "\n");
521 /*
522 * remote-helpers that advertise the bidi-import capability are required to
523 * buffer the complete batch of import commands until this newline before
524 * sending data to fast-import.
525 * These helpers read back data from fast-import on their stdin, which could
526 * be mixed with import commands, otherwise.
527 */
528
529 if (finish_command(&fastimport))
530 die(_("error while running fast-import"));
531
532 /*
533 * The fast-import stream of a remote helper that advertises
534 * the "refspec" capability writes to the refs named after the
535 * right hand side of the first refspec matching each ref we
536 * were fetching.
537 *
538 * (If no "refspec" capability was specified, for historical
539 * reasons we default to the equivalent of *:*.)
540 *
541 * Store the result in to_fetch[i].old_sha1. Callers such
542 * as "git fetch" can use the value to write feedback to the
543 * terminal, populate FETCH_HEAD, and determine what new value
544 * should be written to peer_ref if the update is a
545 * fast-forward or this is a forced update.
546 */
547 for (i = 0; i < nr_heads; i++) {
548 char *private, *name;
549 posn = to_fetch[i];
550 if (posn->status & REF_STATUS_UPTODATE)
551 continue;
552 name = posn->symref ? posn->symref : posn->name;
553 if (data->rs.nr)
554 private = apply_refspecs(&data->rs, name);
555 else
556 private = xstrdup(name);
557 if (private) {
558 if (refs_read_ref(get_main_ref_store(the_repository), private, &posn->old_oid) < 0)
559 die(_("could not read ref %s"), private);
560 free(private);
561 }
562 }
563 strbuf_release(&buf);
564 return 0;
565 }
566
567 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
568 {
569 struct helper_data *data = transport->data;
570 int ret = 0;
571 int duped;
572 FILE *input;
573 struct child_process *helper;
574
575 helper = get_helper(transport);
576
577 /*
578 * Yes, dup the pipe another time, as we need unbuffered version
579 * of input pipe as FILE*. fclose() closes the underlying fd and
580 * stream buffering only can be changed before first I/O operation
581 * on it.
582 */
583 duped = dup(helper->out);
584 if (duped < 0)
585 die_errno(_("can't dup helper output fd"));
586 input = xfdopen(duped, "r");
587 setvbuf(input, NULL, _IONBF, 0);
588
589 sendline(data, cmdbuf);
590 if (recvline_fh(input, cmdbuf))
591 exit(128);
592
593 if (!strcmp(cmdbuf->buf, "")) {
594 data->no_disconnect_req = 1;
595 if (debug)
596 fprintf(stderr, "Debug: Smart transport connection "
597 "ready.\n");
598 ret = 1;
599 } else if (!strcmp(cmdbuf->buf, "fallback")) {
600 if (debug)
601 fprintf(stderr, "Debug: Falling back to dumb "
602 "transport.\n");
603 } else {
604 die(_("unknown response to connect: %s"),
605 cmdbuf->buf);
606 }
607
608 fclose(input);
609 return ret;
610 }
611
612 static int process_connect_service(struct transport *transport,
613 const char *name, const char *exec)
614 {
615 struct helper_data *data = transport->data;
616 struct strbuf cmdbuf = STRBUF_INIT;
617 int ret = 0;
618
619 /*
620 * Handle --upload-pack and friends. This is fire and forget...
621 * just warn if it fails.
622 */
623 if (strcmp(name, exec)) {
624 int r = set_helper_option(transport, "servpath", exec);
625 if (r > 0)
626 warning(_("setting remote service path not supported by protocol"));
627 else if (r < 0)
628 warning(_("invalid remote service path"));
629 }
630
631 if (data->connect) {
632 strbuf_addf(&cmdbuf, "connect %s\n", name);
633 ret = run_connect(transport, &cmdbuf);
634 } else if (data->stateless_connect &&
635 (get_protocol_version_config() == protocol_v2) &&
636 (!strcmp("git-upload-pack", name) ||
637 !strcmp("git-upload-archive", name))) {
638 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
639 ret = run_connect(transport, &cmdbuf);
640 if (ret)
641 transport->stateless_rpc = 1;
642 }
643
644 strbuf_release(&cmdbuf);
645 return ret;
646 }
647
648 static int process_connect(struct transport *transport,
649 int for_push)
650 {
651 struct helper_data *data = transport->data;
652 const char *name;
653 const char *exec;
654 int ret;
655
656 name = for_push ? "git-receive-pack" : "git-upload-pack";
657 if (for_push)
658 exec = data->transport_options.receivepack;
659 else
660 exec = data->transport_options.uploadpack;
661
662 ret = process_connect_service(transport, name, exec);
663 if (ret)
664 do_take_over(transport);
665 return ret;
666 }
667
668 static int connect_helper(struct transport *transport, const char *name,
669 const char *exec, int fd[2])
670 {
671 struct helper_data *data = transport->data;
672
673 /* Get_helper so connect is inited. */
674 get_helper(transport);
675
676 if (!process_connect_service(transport, name, exec))
677 die(_("can't connect to subservice %s"), name);
678
679 fd[0] = data->helper->out;
680 fd[1] = data->helper->in;
681
682 do_take_over(transport);
683 return 0;
684 }
685
686 static struct ref *get_refs_list_using_list(struct transport *transport,
687 int for_push);
688
689 static int fetch_refs(struct transport *transport,
690 int nr_heads, struct ref **to_fetch)
691 {
692 struct helper_data *data = transport->data;
693 int i, count;
694
695 get_helper(transport);
696
697 if (process_connect(transport, 0))
698 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
699
700 /*
701 * If we reach here, then the server, the client, and/or the transport
702 * helper does not support protocol v2. --negotiate-only requires
703 * protocol v2.
704 */
705 if (data->transport_options.acked_commits) {
706 warning(_("--negotiate-only requires protocol v2"));
707 return -1;
708 }
709
710 if (!data->get_refs_list_called)
711 get_refs_list_using_list(transport, 0);
712
713 count = 0;
714 for (i = 0; i < nr_heads; i++)
715 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
716 count++;
717
718 if (!count)
719 return 0;
720
721 if (data->check_connectivity &&
722 data->transport_options.check_self_contained_and_connected)
723 set_helper_option(transport, "check-connectivity", "true");
724
725 if (transport->cloning)
726 set_helper_option(transport, "cloning", "true");
727
728 if (data->transport_options.update_shallow)
729 set_helper_option(transport, "update-shallow", "true");
730
731 if (data->transport_options.refetch)
732 set_helper_option(transport, "refetch", "true");
733
734 if (data->transport_options.filter_options.choice) {
735 const char *spec = expand_list_objects_filter_spec(
736 &data->transport_options.filter_options);
737 set_helper_option(transport, "filter", spec);
738 }
739
740 if (data->transport_options.negotiation_tips)
741 warning("Ignoring --negotiation-tip because the protocol does not support it.");
742
743 if (data->fetch)
744 return fetch_with_fetch(transport, nr_heads, to_fetch);
745
746 if (data->import)
747 return fetch_with_import(transport, nr_heads, to_fetch);
748
749 return -1;
750 }
751
752 struct push_update_ref_state {
753 struct ref *hint;
754 struct ref_push_report *report;
755 int new_report;
756 };
757
758 static int push_update_ref_status(struct strbuf *buf,
759 struct push_update_ref_state *state,
760 struct ref *remote_refs)
761 {
762 char *refname, *msg;
763 int status, forced = 0;
764
765 if (starts_with(buf->buf, "option ")) {
766 struct object_id old_oid, new_oid;
767 const char *key, *val;
768 char *p;
769
770 if (!state->hint || !(state->report || state->new_report))
771 die(_("'option' without a matching 'ok/error' directive"));
772 if (state->new_report) {
773 if (!state->hint->report) {
774 CALLOC_ARRAY(state->hint->report, 1);
775 state->report = state->hint->report;
776 } else {
777 state->report = state->hint->report;
778 while (state->report->next)
779 state->report = state->report->next;
780 CALLOC_ARRAY(state->report->next, 1);
781 state->report = state->report->next;
782 }
783 state->new_report = 0;
784 }
785 key = buf->buf + 7;
786 p = strchr(key, ' ');
787 if (p)
788 *p++ = '\0';
789 val = p;
790 if (!strcmp(key, "refname"))
791 state->report->ref_name = xstrdup_or_null(val);
792 else if (!strcmp(key, "old-oid") && val &&
793 !parse_oid_hex(val, &old_oid, &val))
794 state->report->old_oid = oiddup(&old_oid);
795 else if (!strcmp(key, "new-oid") && val &&
796 !parse_oid_hex(val, &new_oid, &val))
797 state->report->new_oid = oiddup(&new_oid);
798 else if (!strcmp(key, "forced-update"))
799 state->report->forced_update = 1;
800 /* Not update remote namespace again. */
801 return 1;
802 }
803
804 state->report = NULL;
805 state->new_report = 0;
806
807 if (starts_with(buf->buf, "ok ")) {
808 status = REF_STATUS_OK;
809 refname = buf->buf + 3;
810 } else if (starts_with(buf->buf, "error ")) {
811 status = REF_STATUS_REMOTE_REJECT;
812 refname = buf->buf + 6;
813 } else
814 die(_("expected ok/error, helper said '%s'"), buf->buf);
815
816 msg = strchr(refname, ' ');
817 if (msg) {
818 struct strbuf msg_buf = STRBUF_INIT;
819 const char *end;
820
821 *msg++ = '\0';
822 if (!unquote_c_style(&msg_buf, msg, &end))
823 msg = strbuf_detach(&msg_buf, NULL);
824 else
825 msg = xstrdup(msg);
826 strbuf_release(&msg_buf);
827
828 if (!strcmp(msg, "no match")) {
829 status = REF_STATUS_NONE;
830 FREE_AND_NULL(msg);
831 }
832 else if (!strcmp(msg, "up to date")) {
833 status = REF_STATUS_UPTODATE;
834 FREE_AND_NULL(msg);
835 }
836 else if (!strcmp(msg, "non-fast forward")) {
837 status = REF_STATUS_REJECT_NONFASTFORWARD;
838 FREE_AND_NULL(msg);
839 }
840 else if (!strcmp(msg, "already exists")) {
841 status = REF_STATUS_REJECT_ALREADY_EXISTS;
842 FREE_AND_NULL(msg);
843 }
844 else if (!strcmp(msg, "fetch first")) {
845 status = REF_STATUS_REJECT_FETCH_FIRST;
846 FREE_AND_NULL(msg);
847 }
848 else if (!strcmp(msg, "needs force")) {
849 status = REF_STATUS_REJECT_NEEDS_FORCE;
850 FREE_AND_NULL(msg);
851 }
852 else if (!strcmp(msg, "stale info")) {
853 status = REF_STATUS_REJECT_STALE;
854 FREE_AND_NULL(msg);
855 }
856 else if (!strcmp(msg, "remote ref updated since checkout")) {
857 status = REF_STATUS_REJECT_REMOTE_UPDATED;
858 FREE_AND_NULL(msg);
859 }
860 else if (!strcmp(msg, "forced update")) {
861 forced = 1;
862 FREE_AND_NULL(msg);
863 }
864 else if (!strcmp(msg, "expecting report")) {
865 status = REF_STATUS_EXPECTING_REPORT;
866 FREE_AND_NULL(msg);
867 }
868 }
869
870 if (state->hint)
871 state->hint = find_ref_by_name(state->hint, refname);
872 if (!state->hint)
873 state->hint = find_ref_by_name(remote_refs, refname);
874 if (!state->hint) {
875 warning(_("helper reported unexpected status of %s"), refname);
876 return 1;
877 }
878
879 if (state->hint->status != REF_STATUS_NONE) {
880 /*
881 * Earlier, the ref was marked not to be pushed, so ignore the ref
882 * status reported by the remote helper if the latter is 'no match'.
883 */
884 if (status == REF_STATUS_NONE)
885 return 1;
886 }
887
888 if (status == REF_STATUS_OK)
889 state->new_report = 1;
890 state->hint->status = status;
891 state->hint->forced_update |= forced;
892 state->hint->remote_status = msg;
893 return !(status == REF_STATUS_OK);
894 }
895
896 static int push_update_refs_status(struct helper_data *data,
897 struct ref *remote_refs,
898 int flags)
899 {
900 struct ref *ref;
901 struct ref_push_report *report;
902 struct strbuf buf = STRBUF_INIT;
903 struct push_update_ref_state state = { remote_refs, NULL, 0 };
904
905 for (;;) {
906 if (recvline(data, &buf)) {
907 strbuf_release(&buf);
908 return 1;
909 }
910 if (!buf.len)
911 break;
912 push_update_ref_status(&buf, &state, remote_refs);
913 }
914 strbuf_release(&buf);
915
916 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
917 return 0;
918
919 /* propagate back the update to the remote namespace */
920 for (ref = remote_refs; ref; ref = ref->next) {
921 char *private;
922
923 if (ref->status != REF_STATUS_OK)
924 continue;
925
926 if (!ref->report) {
927 private = apply_refspecs(&data->rs, ref->name);
928 if (!private)
929 continue;
930 refs_update_ref(get_main_ref_store(the_repository),
931 "update by helper", private,
932 &(ref->new_oid),
933 NULL, 0, 0);
934 free(private);
935 } else {
936 for (report = ref->report; report; report = report->next) {
937 private = apply_refspecs(&data->rs,
938 report->ref_name
939 ? report->ref_name
940 : ref->name);
941 if (!private)
942 continue;
943 refs_update_ref(get_main_ref_store(the_repository),
944 "update by helper", private,
945 report->new_oid
946 ? report->new_oid
947 : &(ref->new_oid),
948 NULL, 0, 0);
949 free(private);
950 }
951 }
952 }
953 return 0;
954 }
955
956 static void set_common_push_options(struct transport *transport,
957 const char *name, int flags)
958 {
959 if (flags & TRANSPORT_PUSH_DRY_RUN) {
960 if (set_helper_option(transport, "dry-run", "true") != 0)
961 die(_("helper %s does not support dry-run"), name);
962 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
963 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
964 die(_("helper %s does not support --signed"), name);
965 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
966 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
967 die(_("helper %s does not support --signed=if-asked"), name);
968 }
969
970 if (flags & TRANSPORT_PUSH_ATOMIC)
971 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
972 die(_("helper %s does not support --atomic"), name);
973
974 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
975 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
976 die(_("helper %s does not support --%s"),
977 name, TRANS_OPT_FORCE_IF_INCLUDES);
978
979 if (flags & TRANSPORT_PUSH_OPTIONS) {
980 struct string_list_item *item;
981 for_each_string_list_item(item, transport->push_options)
982 if (set_helper_option(transport, "push-option", item->string) != 0)
983 die(_("helper %s does not support 'push-option'"), name);
984 }
985 }
986
987 static int push_refs_with_push(struct transport *transport,
988 struct ref *remote_refs, int flags)
989 {
990 int force_all = flags & TRANSPORT_PUSH_FORCE;
991 int mirror = flags & TRANSPORT_PUSH_MIRROR;
992 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
993 struct helper_data *data = transport->data;
994 struct strbuf buf = STRBUF_INIT;
995 struct ref *ref;
996 struct string_list cas_options = STRING_LIST_INIT_DUP;
997 struct string_list_item *cas_option;
998
999 get_helper(transport);
1000 if (!data->push)
1001 return 1;
1002
1003 for (ref = remote_refs; ref; ref = ref->next) {
1004 if (!ref->peer_ref && !mirror)
1005 continue;
1006
1007 /* Check for statuses set by set_ref_status_for_push() */
1008 switch (ref->status) {
1009 case REF_STATUS_REJECT_NONFASTFORWARD:
1010 case REF_STATUS_REJECT_STALE:
1011 case REF_STATUS_REJECT_ALREADY_EXISTS:
1012 case REF_STATUS_REJECT_REMOTE_UPDATED:
1013 if (atomic) {
1014 reject_atomic_push(remote_refs, mirror);
1015 string_list_clear(&cas_options, 0);
1016 return 0;
1017 } else
1018 continue;
1019 case REF_STATUS_UPTODATE:
1020 continue;
1021 default:
1022 ; /* do nothing */
1023 }
1024
1025 if (force_all)
1026 ref->force = 1;
1027
1028 strbuf_addstr(&buf, "push ");
1029 if (!ref->deletion) {
1030 if (ref->force)
1031 strbuf_addch(&buf, '+');
1032 if (ref->peer_ref)
1033 strbuf_addstr(&buf, ref->peer_ref->name);
1034 else
1035 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1036 }
1037 strbuf_addch(&buf, ':');
1038 strbuf_addstr(&buf, ref->name);
1039 strbuf_addch(&buf, '\n');
1040
1041 /*
1042 * The "--force-with-lease" options without explicit
1043 * values to expect have already been expanded into
1044 * the ref->old_oid_expect[] field; we can ignore
1045 * transport->smart_options->cas altogether and instead
1046 * can enumerate them from the refs.
1047 */
1048 if (ref->expect_old_sha1) {
1049 struct strbuf cas = STRBUF_INIT;
1050 strbuf_addf(&cas, "%s:%s",
1051 ref->name, oid_to_hex(&ref->old_oid_expect));
1052 string_list_append_nodup(&cas_options,
1053 strbuf_detach(&cas, NULL));
1054 }
1055 }
1056 if (buf.len == 0) {
1057 string_list_clear(&cas_options, 0);
1058 return 0;
1059 }
1060
1061 for_each_string_list_item(cas_option, &cas_options)
1062 set_helper_option(transport, "cas", cas_option->string);
1063 set_common_push_options(transport, data->name, flags);
1064
1065 strbuf_addch(&buf, '\n');
1066 sendline(data, &buf);
1067 strbuf_release(&buf);
1068 string_list_clear(&cas_options, 0);
1069
1070 return push_update_refs_status(data, remote_refs, flags);
1071 }
1072
1073 static int push_refs_with_export(struct transport *transport,
1074 struct ref *remote_refs, int flags)
1075 {
1076 struct ref *ref;
1077 struct child_process *helper, exporter;
1078 struct helper_data *data = transport->data;
1079 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1080 struct strbuf buf = STRBUF_INIT;
1081
1082 if (!data->rs.nr)
1083 die(_("remote-helper doesn't support push; refspec needed"));
1084
1085 set_common_push_options(transport, data->name, flags);
1086 if (flags & TRANSPORT_PUSH_FORCE) {
1087 if (set_helper_option(transport, "force", "true") != 0)
1088 warning(_("helper %s does not support '--force'"), data->name);
1089 }
1090
1091 helper = get_helper(transport);
1092
1093 write_constant(helper->in, "export\n");
1094
1095 for (ref = remote_refs; ref; ref = ref->next) {
1096 char *private;
1097 struct object_id oid;
1098
1099 private = apply_refspecs(&data->rs, ref->name);
1100 if (private && !repo_get_oid(the_repository, private, &oid)) {
1101 strbuf_addf(&buf, "^%s", private);
1102 string_list_append_nodup(&revlist_args,
1103 strbuf_detach(&buf, NULL));
1104 oidcpy(&ref->old_oid, &oid);
1105 }
1106 free(private);
1107
1108 if (ref->peer_ref) {
1109 if (strcmp(ref->name, ref->peer_ref->name)) {
1110 if (!ref->deletion) {
1111 const char *name;
1112 int flag;
1113
1114 /* Follow symbolic refs (mainly for HEAD). */
1115 name = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1116 ref->peer_ref->name,
1117 RESOLVE_REF_READING,
1118 &oid,
1119 &flag);
1120 if (!name || !(flag & REF_ISSYMREF))
1121 name = ref->peer_ref->name;
1122
1123 strbuf_addf(&buf, "%s:%s", name, ref->name);
1124 } else
1125 strbuf_addf(&buf, ":%s", ref->name);
1126
1127 string_list_append(&revlist_args, "--refspec");
1128 string_list_append(&revlist_args, buf.buf);
1129 strbuf_release(&buf);
1130 }
1131 if (!ref->deletion)
1132 string_list_append(&revlist_args, ref->peer_ref->name);
1133 }
1134 }
1135
1136 if (get_exporter(transport, &exporter, &revlist_args))
1137 die(_("couldn't run fast-export"));
1138
1139 string_list_clear(&revlist_args, 1);
1140
1141 if (finish_command(&exporter))
1142 die(_("error while running fast-export"));
1143 if (push_update_refs_status(data, remote_refs, flags))
1144 return 1;
1145
1146 if (data->export_marks) {
1147 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1148 rename(buf.buf, data->export_marks);
1149 strbuf_release(&buf);
1150 }
1151
1152 return 0;
1153 }
1154
1155 static int push_refs(struct transport *transport,
1156 struct ref *remote_refs, int flags)
1157 {
1158 struct helper_data *data = transport->data;
1159
1160 if (process_connect(transport, 1))
1161 return transport->vtable->push_refs(transport, remote_refs, flags);
1162
1163 if (!remote_refs) {
1164 fprintf(stderr,
1165 _("No refs in common and none specified; doing nothing.\n"
1166 "Perhaps you should specify a branch.\n"));
1167 return 0;
1168 }
1169
1170 if (data->push)
1171 return push_refs_with_push(transport, remote_refs, flags);
1172
1173 if (data->export)
1174 return push_refs_with_export(transport, remote_refs, flags);
1175
1176 return -1;
1177 }
1178
1179
1180 static int has_attribute(const char *attrs, const char *attr)
1181 {
1182 int len;
1183 if (!attrs)
1184 return 0;
1185
1186 len = strlen(attr);
1187 for (;;) {
1188 const char *space = strchrnul(attrs, ' ');
1189 if (len == space - attrs && !strncmp(attrs, attr, len))
1190 return 1;
1191 if (!*space)
1192 return 0;
1193 attrs = space + 1;
1194 }
1195 }
1196
1197 static struct ref *get_refs_list(struct transport *transport, int for_push,
1198 struct transport_ls_refs_options *transport_options)
1199 {
1200 get_helper(transport);
1201
1202 if (process_connect(transport, for_push))
1203 return transport->vtable->get_refs_list(transport, for_push,
1204 transport_options);
1205
1206 return get_refs_list_using_list(transport, for_push);
1207 }
1208
1209 static struct ref *get_refs_list_using_list(struct transport *transport,
1210 int for_push)
1211 {
1212 struct helper_data *data = transport->data;
1213 struct child_process *helper;
1214 struct ref *ret = NULL;
1215 struct ref **tail = &ret;
1216 struct ref *posn;
1217 struct strbuf buf = STRBUF_INIT;
1218
1219 data->get_refs_list_called = 1;
1220 helper = get_helper(transport);
1221
1222 if (data->object_format)
1223 set_helper_option(transport, "object-format", "true");
1224
1225 if (data->push && for_push)
1226 write_constant(helper->in, "list for-push\n");
1227 else
1228 write_constant(helper->in, "list\n");
1229
1230 while (1) {
1231 char *eov, *eon;
1232 if (recvline(data, &buf))
1233 exit(128);
1234
1235 if (!*buf.buf)
1236 break;
1237 else if (buf.buf[0] == ':') {
1238 const char *value;
1239 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1240 int algo = hash_algo_by_name(value);
1241 if (algo == GIT_HASH_UNKNOWN)
1242 die(_("unsupported object format '%s'"),
1243 value);
1244 transport->hash_algo = &hash_algos[algo];
1245 }
1246 continue;
1247 }
1248
1249 eov = strchr(buf.buf, ' ');
1250 if (!eov)
1251 die(_("malformed response in ref list: %s"), buf.buf);
1252 eon = strchr(eov + 1, ' ');
1253 *eov = '\0';
1254 if (eon)
1255 *eon = '\0';
1256 *tail = alloc_ref(eov + 1);
1257 if (buf.buf[0] == '@')
1258 (*tail)->symref = xstrdup(buf.buf + 1);
1259 else if (buf.buf[0] != '?')
1260 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1261 if (eon) {
1262 if (has_attribute(eon + 1, "unchanged")) {
1263 (*tail)->status |= REF_STATUS_UPTODATE;
1264 if (refs_read_ref(get_main_ref_store(the_repository), (*tail)->name, &(*tail)->old_oid) < 0)
1265 die(_("could not read ref %s"),
1266 (*tail)->name);
1267 }
1268 }
1269 tail = &((*tail)->next);
1270 }
1271 if (debug)
1272 fprintf(stderr, "Debug: Read ref listing.\n");
1273 strbuf_release(&buf);
1274
1275 for (posn = ret; posn; posn = posn->next)
1276 resolve_remote_symref(posn, ret);
1277
1278 return ret;
1279 }
1280
1281 static int get_bundle_uri(struct transport *transport)
1282 {
1283 get_helper(transport);
1284
1285 if (process_connect(transport, 0))
1286 return transport->vtable->get_bundle_uri(transport);
1287
1288 return -1;
1289 }
1290
1291 static struct transport_vtable vtable = {
1292 .set_option = set_helper_option,
1293 .get_refs_list = get_refs_list,
1294 .get_bundle_uri = get_bundle_uri,
1295 .fetch_refs = fetch_refs,
1296 .push_refs = push_refs,
1297 .connect = connect_helper,
1298 .disconnect = release_helper
1299 };
1300
1301 int transport_helper_init(struct transport *transport, const char *name)
1302 {
1303 struct helper_data *data = xcalloc(1, sizeof(*data));
1304 data->name = xstrdup(name);
1305
1306 transport_check_allowed(name);
1307
1308 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1309 debug = 1;
1310
1311 list_objects_filter_init(&data->transport_options.filter_options);
1312
1313 transport->data = data;
1314 transport->vtable = &vtable;
1315 transport->smart_options = &(data->transport_options);
1316 return 0;
1317 }
1318
1319 /*
1320 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1321 * buffer less), so attempt reads and writes with up to that size.
1322 */
1323 #define BUFFERSIZE 65536
1324 /* This should be enough to hold debugging message. */
1325 #define PBUFFERSIZE 8192
1326
1327 /* Print bidirectional transfer loop debug message. */
1328 __attribute__((format (printf, 1, 2)))
1329 static void transfer_debug(const char *fmt, ...)
1330 {
1331 /*
1332 * NEEDSWORK: This function is sometimes used from multiple threads, and
1333 * we end up using debug_enabled racily. That "should not matter" since
1334 * we always write the same value, but it's still wrong. This function
1335 * is listed in .tsan-suppressions for the time being.
1336 */
1337
1338 va_list args;
1339 char msgbuf[PBUFFERSIZE];
1340 static int debug_enabled = -1;
1341
1342 if (debug_enabled < 0)
1343 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1344 if (!debug_enabled)
1345 return;
1346
1347 va_start(args, fmt);
1348 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1349 va_end(args);
1350 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1351 }
1352
1353 /* Stream state: More data may be coming in this direction. */
1354 #define SSTATE_TRANSFERRING 0
1355 /*
1356 * Stream state: No more data coming in this direction, flushing rest of
1357 * data.
1358 */
1359 #define SSTATE_FLUSHING 1
1360 /* Stream state: Transfer in this direction finished. */
1361 #define SSTATE_FINISHED 2
1362
1363 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1364 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1365 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1366
1367 /* Unidirectional transfer. */
1368 struct unidirectional_transfer {
1369 /* Source */
1370 int src;
1371 /* Destination */
1372 int dest;
1373 /* Is source socket? */
1374 int src_is_sock;
1375 /* Is destination socket? */
1376 int dest_is_sock;
1377 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1378 int state;
1379 /* Buffer. */
1380 char buf[BUFFERSIZE];
1381 /* Buffer used. */
1382 size_t bufuse;
1383 /* Name of source. */
1384 const char *src_name;
1385 /* Name of destination. */
1386 const char *dest_name;
1387 };
1388
1389 /* Closes the target (for writing) if transfer has finished. */
1390 static void udt_close_if_finished(struct unidirectional_transfer *t)
1391 {
1392 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1393 t->state = SSTATE_FINISHED;
1394 if (t->dest_is_sock)
1395 shutdown(t->dest, SHUT_WR);
1396 else
1397 close(t->dest);
1398 transfer_debug("Closed %s.", t->dest_name);
1399 }
1400 }
1401
1402 /*
1403 * Tries to read data from source into buffer. If buffer is full,
1404 * no data is read. Returns 0 on success, -1 on error.
1405 */
1406 static int udt_do_read(struct unidirectional_transfer *t)
1407 {
1408 ssize_t bytes;
1409
1410 if (t->bufuse == BUFFERSIZE)
1411 return 0; /* No space for more. */
1412
1413 transfer_debug("%s is readable", t->src_name);
1414 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1415 if (bytes < 0) {
1416 error_errno(_("read(%s) failed"), t->src_name);
1417 return -1;
1418 } else if (bytes == 0) {
1419 transfer_debug("%s EOF (with %i bytes in buffer)",
1420 t->src_name, (int)t->bufuse);
1421 t->state = SSTATE_FLUSHING;
1422 } else if (bytes > 0) {
1423 t->bufuse += bytes;
1424 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1425 (int)bytes, t->src_name, (int)t->bufuse);
1426 }
1427 return 0;
1428 }
1429
1430 /* Tries to write data from buffer into destination. If buffer is empty,
1431 * no data is written. Returns 0 on success, -1 on error.
1432 */
1433 static int udt_do_write(struct unidirectional_transfer *t)
1434 {
1435 ssize_t bytes;
1436
1437 if (t->bufuse == 0)
1438 return 0; /* Nothing to write. */
1439
1440 transfer_debug("%s is writable", t->dest_name);
1441 bytes = xwrite(t->dest, t->buf, t->bufuse);
1442 if (bytes < 0) {
1443 error_errno(_("write(%s) failed"), t->dest_name);
1444 return -1;
1445 } else if (bytes > 0) {
1446 t->bufuse -= bytes;
1447 if (t->bufuse)
1448 memmove(t->buf, t->buf + bytes, t->bufuse);
1449 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1450 (int)bytes, t->dest_name, (int)t->bufuse);
1451 }
1452 return 0;
1453 }
1454
1455
1456 /* State of bidirectional transfer loop. */
1457 struct bidirectional_transfer_state {
1458 /* Direction from program to git. */
1459 struct unidirectional_transfer ptg;
1460 /* Direction from git to program. */
1461 struct unidirectional_transfer gtp;
1462 };
1463
1464 static void *udt_copy_task_routine(void *udt)
1465 {
1466 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1467 while (t->state != SSTATE_FINISHED) {
1468 if (STATE_NEEDS_READING(t->state))
1469 if (udt_do_read(t))
1470 return NULL;
1471 if (STATE_NEEDS_WRITING(t->state))
1472 if (udt_do_write(t))
1473 return NULL;
1474 if (STATE_NEEDS_CLOSING(t->state))
1475 udt_close_if_finished(t);
1476 }
1477 return udt; /* Just some non-NULL value. */
1478 }
1479
1480 #ifndef NO_PTHREADS
1481
1482 /*
1483 * Join thread, with appropriate errors on failure. Name is name for the
1484 * thread (for error messages). Returns 0 on success, 1 on failure.
1485 */
1486 static int tloop_join(pthread_t thread, const char *name)
1487 {
1488 int err;
1489 void *tret;
1490 err = pthread_join(thread, &tret);
1491 if (!tret) {
1492 error(_("%s thread failed"), name);
1493 return 1;
1494 }
1495 if (err) {
1496 error(_("%s thread failed to join: %s"), name, strerror(err));
1497 return 1;
1498 }
1499 return 0;
1500 }
1501
1502 /*
1503 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1504 * -1 on failure.
1505 */
1506 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1507 {
1508 pthread_t gtp_thread;
1509 pthread_t ptg_thread;
1510 int err;
1511 int ret = 0;
1512 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1513 &s->gtp);
1514 if (err)
1515 die(_("can't start thread for copying data: %s"), strerror(err));
1516 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1517 &s->ptg);
1518 if (err)
1519 die(_("can't start thread for copying data: %s"), strerror(err));
1520
1521 ret |= tloop_join(gtp_thread, "Git to program copy");
1522 ret |= tloop_join(ptg_thread, "Program to git copy");
1523 return ret;
1524 }
1525 #else
1526
1527 /* Close the source and target (for writing) for transfer. */
1528 static void udt_kill_transfer(struct unidirectional_transfer *t)
1529 {
1530 t->state = SSTATE_FINISHED;
1531 /*
1532 * Socket read end left open isn't a disaster if nobody
1533 * attempts to read from it (mingw compat headers do not
1534 * have SHUT_RD)...
1535 *
1536 * We can't fully close the socket since otherwise gtp
1537 * task would first close the socket it sends data to
1538 * while closing the ptg file descriptors.
1539 */
1540 if (!t->src_is_sock)
1541 close(t->src);
1542 if (t->dest_is_sock)
1543 shutdown(t->dest, SHUT_WR);
1544 else
1545 close(t->dest);
1546 }
1547
1548 /*
1549 * Join process, with appropriate errors on failure. Name is name for the
1550 * process (for error messages). Returns 0 on success, 1 on failure.
1551 */
1552 static int tloop_join(pid_t pid, const char *name)
1553 {
1554 int tret;
1555 if (waitpid(pid, &tret, 0) < 0) {
1556 error_errno(_("%s process failed to wait"), name);
1557 return 1;
1558 }
1559 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1560 error(_("%s process failed"), name);
1561 return 1;
1562 }
1563 return 0;
1564 }
1565
1566 /*
1567 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1568 * -1 on failure.
1569 */
1570 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1571 {
1572 pid_t pid1, pid2;
1573 int ret = 0;
1574
1575 /* Fork thread #1: git to program. */
1576 pid1 = fork();
1577 if (pid1 < 0)
1578 die_errno(_("can't start thread for copying data"));
1579 else if (pid1 == 0) {
1580 udt_kill_transfer(&s->ptg);
1581 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1582 }
1583
1584 /* Fork thread #2: program to git. */
1585 pid2 = fork();
1586 if (pid2 < 0)
1587 die_errno(_("can't start thread for copying data"));
1588 else if (pid2 == 0) {
1589 udt_kill_transfer(&s->gtp);
1590 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1591 }
1592
1593 /*
1594 * Close both streams in parent as to not interfere with
1595 * end of file detection and wait for both tasks to finish.
1596 */
1597 udt_kill_transfer(&s->gtp);
1598 udt_kill_transfer(&s->ptg);
1599 ret |= tloop_join(pid1, "Git to program copy");
1600 ret |= tloop_join(pid2, "Program to git copy");
1601 return ret;
1602 }
1603 #endif
1604
1605 /*
1606 * Copies data from stdin to output and from input to stdout simultaneously.
1607 * Additionally filtering through given filter. If filter is NULL, uses
1608 * identity filter.
1609 */
1610 int bidirectional_transfer_loop(int input, int output)
1611 {
1612 struct bidirectional_transfer_state state;
1613
1614 /* Fill the state fields. */
1615 state.ptg.src = input;
1616 state.ptg.dest = 1;
1617 state.ptg.src_is_sock = (input == output);
1618 state.ptg.dest_is_sock = 0;
1619 state.ptg.state = SSTATE_TRANSFERRING;
1620 state.ptg.bufuse = 0;
1621 state.ptg.src_name = "remote input";
1622 state.ptg.dest_name = "stdout";
1623
1624 state.gtp.src = 0;
1625 state.gtp.dest = output;
1626 state.gtp.src_is_sock = 0;
1627 state.gtp.dest_is_sock = (input == output);
1628 state.gtp.state = SSTATE_TRANSFERRING;
1629 state.gtp.bufuse = 0;
1630 state.gtp.src_name = "stdin";
1631 state.gtp.dest_name = "remote output";
1632
1633 return tloop_spawnwait_tasks(&state);
1634 }
1635
1636 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1637 {
1638 struct ref *ref;
1639
1640 /* Mark other refs as failed */
1641 for (ref = remote_refs; ref; ref = ref->next) {
1642 if (!ref->peer_ref && !mirror_mode)
1643 continue;
1644
1645 switch (ref->status) {
1646 case REF_STATUS_NONE:
1647 case REF_STATUS_OK:
1648 case REF_STATUS_EXPECTING_REPORT:
1649 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1650 continue;
1651 default:
1652 break; /* do nothing */
1653 }
1654 }
1655 return;
1656 }
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