?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
refs: implement removal of ref storages
[git/gitster.git] / transport-helper.c
blob780fcaf5292c315c5088736e2700b6ce937acc63
1 #include "git-compat-util.h"
2 #include "transport.h"
3 #include "quote.h"
4 #include "run-command.h"
5 #include "commit.h"
6 #include "environment.h"
7 #include "gettext.h"
8 #include "hex.h"
9 #include "object-name.h"
10 #include "repository.h"
11 #include "remote.h"
12 #include "string-list.h"
13 #include "thread-utils.h"
14 #include "sigchain.h"
15 #include "strvec.h"
16 #include "refs.h"
17 #include "refspec.h"
18 #include "transport-internal.h"
19 #include "protocol.h"
20 #include "packfile.h"
21
22 static int debug;
23
24 struct helper_data {
25 const char *name;
26 struct child_process *helper;
27 FILE *out;
28 unsigned fetch : 1,
29 import : 1,
30 bidi_import : 1,
31 export : 1,
32 option : 1,
33 push : 1,
34 connect : 1,
35 stateless_connect : 1,
36 signed_tags : 1,
37 check_connectivity : 1,
38 no_disconnect_req : 1,
39 no_private_update : 1,
40 object_format : 1;
41
42 /*
43 * As an optimization, the transport code may invoke fetch before
44 * get_refs_list. If this happens, and if the transport helper doesn't
45 * support connect or stateless_connect, we need to invoke
46 * get_refs_list ourselves if we haven't already done so. Keep track of
47 * whether we have invoked get_refs_list.
48 */
49 unsigned get_refs_list_called : 1;
50
51 char *export_marks;
52 char *import_marks;
53 /* These go from remote name (as in "list") to private name */
54 struct refspec rs;
55 /* Transport options for fetch-pack/send-pack (should one of
56 * those be invoked).
57 */
58 struct git_transport_options transport_options;
59 };
60
61 static void sendline(struct helper_data *helper, struct strbuf *buffer)
62 {
63 if (debug)
64 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
65 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
66 die_errno(_("full write to remote helper failed"));
67 }
68
69 static int recvline_fh(FILE *helper, struct strbuf *buffer)
70 {
71 strbuf_reset(buffer);
72 if (debug)
73 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
74 if (strbuf_getline(buffer, helper) == EOF) {
75 if (debug)
76 fprintf(stderr, "Debug: Remote helper quit.\n");
77 return 1;
78 }
79
80 if (debug)
81 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
82 return 0;
83 }
84
85 static int recvline(struct helper_data *helper, struct strbuf *buffer)
86 {
87 return recvline_fh(helper->out, buffer);
88 }
89
90 static void write_constant(int fd, const char *str)
91 {
92 if (debug)
93 fprintf(stderr, "Debug: Remote helper: -> %s", str);
94 if (write_in_full(fd, str, strlen(str)) < 0)
95 die_errno(_("full write to remote helper failed"));
96 }
97
98 static const char *remove_ext_force(const char *url)
99 {
100 if (url) {
101 const char *colon = strchr(url, ':');
102 if (colon && colon[1] == ':')
103 return colon + 2;
104 }
105 return url;
106 }
107
108 static void do_take_over(struct transport *transport)
109 {
110 struct helper_data *data;
111 data = (struct helper_data *)transport->data;
112 transport_take_over(transport, data->helper);
113 fclose(data->out);
114 free(data);
115 }
116
117 static void standard_options(struct transport *t);
118
119 static struct child_process *get_helper(struct transport *transport)
120 {
121 struct helper_data *data = transport->data;
122 struct strbuf buf = STRBUF_INIT;
123 struct child_process *helper;
124 int duped;
125 int code;
126
127 if (data->helper)
128 return data->helper;
129
130 helper = xmalloc(sizeof(*helper));
131 child_process_init(helper);
132 helper->in = -1;
133 helper->out = -1;
134 helper->err = 0;
135 strvec_pushf(&helper->args, "remote-%s", data->name);
136 strvec_push(&helper->args, transport->remote->name);
137 strvec_push(&helper->args, remove_ext_force(transport->url));
138 helper->git_cmd = 1;
139 helper->silent_exec_failure = 1;
140
141 if (have_git_dir())
142 strvec_pushf(&helper->env, "%s=%s",
143 GIT_DIR_ENVIRONMENT, get_git_dir());
144
145 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
146
147 code = start_command(helper);
148 if (code < 0 && errno == ENOENT)
149 die(_("unable to find remote helper for '%s'"), data->name);
150 else if (code != 0)
151 exit(code);
152
153 data->helper = helper;
154 data->no_disconnect_req = 0;
155 refspec_init(&data->rs, REFSPEC_FETCH);
156
157 /*
158 * Open the output as FILE* so strbuf_getline_*() family of
159 * functions can be used.
160 * Do this with duped fd because fclose() will close the fd,
161 * and stuff like taking over will require the fd to remain.
162 */
163 duped = dup(helper->out);
164 if (duped < 0)
165 die_errno(_("can't dup helper output fd"));
166 data->out = xfdopen(duped, "r");
167
168 write_constant(helper->in, "capabilities\n");
169
170 while (1) {
171 const char *capname, *arg;
172 int mandatory = 0;
173 if (recvline(data, &buf))
174 exit(128);
175
176 if (!*buf.buf)
177 break;
178
179 if (*buf.buf == '*') {
180 capname = buf.buf + 1;
181 mandatory = 1;
182 } else
183 capname = buf.buf;
184
185 if (debug)
186 fprintf(stderr, "Debug: Got cap %s\n", capname);
187 if (!strcmp(capname, "fetch"))
188 data->fetch = 1;
189 else if (!strcmp(capname, "option"))
190 data->option = 1;
191 else if (!strcmp(capname, "push"))
192 data->push = 1;
193 else if (!strcmp(capname, "import"))
194 data->import = 1;
195 else if (!strcmp(capname, "bidi-import"))
196 data->bidi_import = 1;
197 else if (!strcmp(capname, "export"))
198 data->export = 1;
199 else if (!strcmp(capname, "check-connectivity"))
200 data->check_connectivity = 1;
201 else if (skip_prefix(capname, "refspec ", &arg)) {
202 refspec_append(&data->rs, arg);
203 } else if (!strcmp(capname, "connect")) {
204 data->connect = 1;
205 } else if (!strcmp(capname, "stateless-connect")) {
206 data->stateless_connect = 1;
207 } else if (!strcmp(capname, "signed-tags")) {
208 data->signed_tags = 1;
209 } else if (skip_prefix(capname, "export-marks ", &arg)) {
210 data->export_marks = xstrdup(arg);
211 } else if (skip_prefix(capname, "import-marks ", &arg)) {
212 data->import_marks = xstrdup(arg);
213 } else if (starts_with(capname, "no-private-update")) {
214 data->no_private_update = 1;
215 } else if (starts_with(capname, "object-format")) {
216 data->object_format = 1;
217 } else if (mandatory) {
218 die(_("unknown mandatory capability %s; this remote "
219 "helper probably needs newer version of Git"),
220 capname);
221 }
222 }
223 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
224 warning(_("this remote helper should implement refspec capability"));
225 }
226 strbuf_release(&buf);
227 if (debug)
228 fprintf(stderr, "Debug: Capabilities complete.\n");
229 standard_options(transport);
230 return data->helper;
231 }
232
233 static int disconnect_helper(struct transport *transport)
234 {
235 struct helper_data *data = transport->data;
236 int res = 0;
237
238 if (data->helper) {
239 if (debug)
240 fprintf(stderr, "Debug: Disconnecting.\n");
241 if (!data->no_disconnect_req) {
242 /*
243 * Ignore write errors; there's nothing we can do,
244 * since we're about to close the pipe anyway. And the
245 * most likely error is EPIPE due to the helper dying
246 * to report an error itself.
247 */
248 sigchain_push(SIGPIPE, SIG_IGN);
249 xwrite(data->helper->in, "\n", 1);
250 sigchain_pop(SIGPIPE);
251 }
252 close(data->helper->in);
253 close(data->helper->out);
254 fclose(data->out);
255 res = finish_command(data->helper);
256 FREE_AND_NULL(data->helper);
257 }
258 return res;
259 }
260
261 static const char *unsupported_options[] = {
262 TRANS_OPT_UPLOADPACK,
263 TRANS_OPT_RECEIVEPACK,
264 TRANS_OPT_THIN,
265 TRANS_OPT_KEEP
266 };
267
268 static const char *boolean_options[] = {
269 TRANS_OPT_THIN,
270 TRANS_OPT_KEEP,
271 TRANS_OPT_FOLLOWTAGS,
272 TRANS_OPT_DEEPEN_RELATIVE
273 };
274
275 static int strbuf_set_helper_option(struct helper_data *data,
276 struct strbuf *buf)
277 {
278 int ret;
279
280 sendline(data, buf);
281 if (recvline(data, buf))
282 exit(128);
283
284 if (!strcmp(buf->buf, "ok"))
285 ret = 0;
286 else if (starts_with(buf->buf, "error"))
287 ret = -1;
288 else if (!strcmp(buf->buf, "unsupported"))
289 ret = 1;
290 else {
291 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
292 ret = 1;
293 }
294 return ret;
295 }
296
297 static int string_list_set_helper_option(struct helper_data *data,
298 const char *name,
299 struct string_list *list)
300 {
301 struct strbuf buf = STRBUF_INIT;
302 int i, ret = 0;
303
304 for (i = 0; i < list->nr; i++) {
305 strbuf_addf(&buf, "option %s ", name);
306 quote_c_style(list->items[i].string, &buf, NULL, 0);
307 strbuf_addch(&buf, '\n');
308
309 if ((ret = strbuf_set_helper_option(data, &buf)))
310 break;
311 strbuf_reset(&buf);
312 }
313 strbuf_release(&buf);
314 return ret;
315 }
316
317 static int set_helper_option(struct transport *transport,
318 const char *name, const char *value)
319 {
320 struct helper_data *data = transport->data;
321 struct strbuf buf = STRBUF_INIT;
322 int i, ret, is_bool = 0;
323
324 get_helper(transport);
325
326 if (!data->option)
327 return 1;
328
329 if (!strcmp(name, "deepen-not"))
330 return string_list_set_helper_option(data, name,
331 (struct string_list *)value);
332
333 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
334 if (!strcmp(name, unsupported_options[i]))
335 return 1;
336 }
337
338 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
339 if (!strcmp(name, boolean_options[i])) {
340 is_bool = 1;
341 break;
342 }
343 }
344
345 strbuf_addf(&buf, "option %s ", name);
346 if (is_bool)
347 strbuf_addstr(&buf, value ? "true" : "false");
348 else
349 quote_c_style(value, &buf, NULL, 0);
350 strbuf_addch(&buf, '\n');
351
352 ret = strbuf_set_helper_option(data, &buf);
353 strbuf_release(&buf);
354 return ret;
355 }
356
357 static void standard_options(struct transport *t)
358 {
359 char buf[16];
360 int v = t->verbose;
361
362 set_helper_option(t, "progress", t->progress ? "true" : "false");
363
364 xsnprintf(buf, sizeof(buf), "%d", v + 1);
365 set_helper_option(t, "verbosity", buf);
366
367 switch (t->family) {
368 case TRANSPORT_FAMILY_ALL:
369 /*
370 * this is already the default,
371 * do not break old remote helpers by setting "all" here
372 */
373 break;
374 case TRANSPORT_FAMILY_IPV4:
375 set_helper_option(t, "family", "ipv4");
376 break;
377 case TRANSPORT_FAMILY_IPV6:
378 set_helper_option(t, "family", "ipv6");
379 break;
380 }
381 }
382
383 static int release_helper(struct transport *transport)
384 {
385 int res = 0;
386 struct helper_data *data = transport->data;
387 refspec_clear(&data->rs);
388 res = disconnect_helper(transport);
389 free(transport->data);
390 return res;
391 }
392
393 static int fetch_with_fetch(struct transport *transport,
394 int nr_heads, struct ref **to_fetch)
395 {
396 struct helper_data *data = transport->data;
397 int i;
398 struct strbuf buf = STRBUF_INIT;
399
400 for (i = 0; i < nr_heads; i++) {
401 const struct ref *posn = to_fetch[i];
402 if (posn->status & REF_STATUS_UPTODATE)
403 continue;
404
405 strbuf_addf(&buf, "fetch %s %s\n",
406 oid_to_hex(&posn->old_oid),
407 posn->symref ? posn->symref : posn->name);
408 }
409
410 strbuf_addch(&buf, '\n');
411 sendline(data, &buf);
412
413 while (1) {
414 const char *name;
415
416 if (recvline(data, &buf))
417 exit(128);
418
419 if (skip_prefix(buf.buf, "lock ", &name)) {
420 if (transport->pack_lockfiles.nr)
421 warning(_("%s also locked %s"), data->name, name);
422 else
423 string_list_append(&transport->pack_lockfiles,
424 name);
425 }
426 else if (data->check_connectivity &&
427 data->transport_options.check_self_contained_and_connected &&
428 !strcmp(buf.buf, "connectivity-ok"))
429 data->transport_options.self_contained_and_connected = 1;
430 else if (!buf.len)
431 break;
432 else
433 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
434 }
435 strbuf_release(&buf);
436
437 reprepare_packed_git(the_repository);
438 return 0;
439 }
440
441 static int get_importer(struct transport *transport, struct child_process *fastimport)
442 {
443 struct child_process *helper = get_helper(transport);
444 struct helper_data *data = transport->data;
445 int cat_blob_fd, code;
446 child_process_init(fastimport);
447 fastimport->in = xdup(helper->out);
448 strvec_push(&fastimport->args, "fast-import");
449 strvec_push(&fastimport->args, "--allow-unsafe-features");
450 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
451
452 if (data->bidi_import) {
453 cat_blob_fd = xdup(helper->in);
454 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
455 }
456 fastimport->git_cmd = 1;
457
458 code = start_command(fastimport);
459 return code;
460 }
461
462 static int get_exporter(struct transport *transport,
463 struct child_process *fastexport,
464 struct string_list *revlist_args)
465 {
466 struct helper_data *data = transport->data;
467 struct child_process *helper = get_helper(transport);
468 int i;
469
470 child_process_init(fastexport);
471
472 /* we need to duplicate helper->in because we want to use it after
473 * fastexport is done with it. */
474 fastexport->out = dup(helper->in);
475 strvec_push(&fastexport->args, "fast-export");
476 strvec_push(&fastexport->args, "--use-done-feature");
477 strvec_push(&fastexport->args, data->signed_tags ?
478 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
479 if (data->export_marks)
480 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
481 if (data->import_marks)
482 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
483
484 for (i = 0; i < revlist_args->nr; i++)
485 strvec_push(&fastexport->args, revlist_args->items[i].string);
486
487 fastexport->git_cmd = 1;
488 return start_command(fastexport);
489 }
490
491 static int fetch_with_import(struct transport *transport,
492 int nr_heads, struct ref **to_fetch)
493 {
494 struct child_process fastimport;
495 struct helper_data *data = transport->data;
496 int i;
497 struct ref *posn;
498 struct strbuf buf = STRBUF_INIT;
499
500 get_helper(transport);
501
502 if (get_importer(transport, &fastimport))
503 die(_("couldn't run fast-import"));
504
505 for (i = 0; i < nr_heads; i++) {
506 posn = to_fetch[i];
507 if (posn->status & REF_STATUS_UPTODATE)
508 continue;
509
510 strbuf_addf(&buf, "import %s\n",
511 posn->symref ? posn->symref : posn->name);
512 sendline(data, &buf);
513 strbuf_reset(&buf);
514 }
515
516 write_constant(data->helper->in, "\n");
517 /*
518 * remote-helpers that advertise the bidi-import capability are required to
519 * buffer the complete batch of import commands until this newline before
520 * sending data to fast-import.
521 * These helpers read back data from fast-import on their stdin, which could
522 * be mixed with import commands, otherwise.
523 */
524
525 if (finish_command(&fastimport))
526 die(_("error while running fast-import"));
527
528 /*
529 * The fast-import stream of a remote helper that advertises
530 * the "refspec" capability writes to the refs named after the
531 * right hand side of the first refspec matching each ref we
532 * were fetching.
533 *
534 * (If no "refspec" capability was specified, for historical
535 * reasons we default to the equivalent of *:*.)
536 *
537 * Store the result in to_fetch[i].old_sha1. Callers such
538 * as "git fetch" can use the value to write feedback to the
539 * terminal, populate FETCH_HEAD, and determine what new value
540 * should be written to peer_ref if the update is a
541 * fast-forward or this is a forced update.
542 */
543 for (i = 0; i < nr_heads; i++) {
544 char *private, *name;
545 posn = to_fetch[i];
546 if (posn->status & REF_STATUS_UPTODATE)
547 continue;
548 name = posn->symref ? posn->symref : posn->name;
549 if (data->rs.nr)
550 private = apply_refspecs(&data->rs, name);
551 else
552 private = xstrdup(name);
553 if (private) {
554 if (refs_read_ref(get_main_ref_store(the_repository), private, &posn->old_oid) < 0)
555 die(_("could not read ref %s"), private);
556 free(private);
557 }
558 }
559 strbuf_release(&buf);
560 return 0;
561 }
562
563 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
564 {
565 struct helper_data *data = transport->data;
566 int ret = 0;
567 int duped;
568 FILE *input;
569 struct child_process *helper;
570
571 helper = get_helper(transport);
572
573 /*
574 * Yes, dup the pipe another time, as we need unbuffered version
575 * of input pipe as FILE*. fclose() closes the underlying fd and
576 * stream buffering only can be changed before first I/O operation
577 * on it.
578 */
579 duped = dup(helper->out);
580 if (duped < 0)
581 die_errno(_("can't dup helper output fd"));
582 input = xfdopen(duped, "r");
583 setvbuf(input, NULL, _IONBF, 0);
584
585 sendline(data, cmdbuf);
586 if (recvline_fh(input, cmdbuf))
587 exit(128);
588
589 if (!strcmp(cmdbuf->buf, "")) {
590 data->no_disconnect_req = 1;
591 if (debug)
592 fprintf(stderr, "Debug: Smart transport connection "
593 "ready.\n");
594 ret = 1;
595 } else if (!strcmp(cmdbuf->buf, "fallback")) {
596 if (debug)
597 fprintf(stderr, "Debug: Falling back to dumb "
598 "transport.\n");
599 } else {
600 die(_("unknown response to connect: %s"),
601 cmdbuf->buf);
602 }
603
604 fclose(input);
605 return ret;
606 }
607
608 static int process_connect_service(struct transport *transport,
609 const char *name, const char *exec)
610 {
611 struct helper_data *data = transport->data;
612 struct strbuf cmdbuf = STRBUF_INIT;
613 int ret = 0;
614
615 /*
616 * Handle --upload-pack and friends. This is fire and forget...
617 * just warn if it fails.
618 */
619 if (strcmp(name, exec)) {
620 int r = set_helper_option(transport, "servpath", exec);
621 if (r > 0)
622 warning(_("setting remote service path not supported by protocol"));
623 else if (r < 0)
624 warning(_("invalid remote service path"));
625 }
626
627 if (data->connect) {
628 strbuf_addf(&cmdbuf, "connect %s\n", name);
629 ret = run_connect(transport, &cmdbuf);
630 } else if (data->stateless_connect &&
631 (get_protocol_version_config() == protocol_v2) &&
632 (!strcmp("git-upload-pack", name) ||
633 !strcmp("git-upload-archive", name))) {
634 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
635 ret = run_connect(transport, &cmdbuf);
636 if (ret)
637 transport->stateless_rpc = 1;
638 }
639
640 strbuf_release(&cmdbuf);
641 return ret;
642 }
643
644 static int process_connect(struct transport *transport,
645 int for_push)
646 {
647 struct helper_data *data = transport->data;
648 const char *name;
649 const char *exec;
650 int ret;
651
652 name = for_push ? "git-receive-pack" : "git-upload-pack";
653 if (for_push)
654 exec = data->transport_options.receivepack;
655 else
656 exec = data->transport_options.uploadpack;
657
658 ret = process_connect_service(transport, name, exec);
659 if (ret)
660 do_take_over(transport);
661 return ret;
662 }
663
664 static int connect_helper(struct transport *transport, const char *name,
665 const char *exec, int fd[2])
666 {
667 struct helper_data *data = transport->data;
668
669 /* Get_helper so connect is inited. */
670 get_helper(transport);
671
672 if (!process_connect_service(transport, name, exec))
673 die(_("can't connect to subservice %s"), name);
674
675 fd[0] = data->helper->out;
676 fd[1] = data->helper->in;
677
678 do_take_over(transport);
679 return 0;
680 }
681
682 static struct ref *get_refs_list_using_list(struct transport *transport,
683 int for_push);
684
685 static int fetch_refs(struct transport *transport,
686 int nr_heads, struct ref **to_fetch)
687 {
688 struct helper_data *data = transport->data;
689 int i, count;
690
691 get_helper(transport);
692
693 if (process_connect(transport, 0))
694 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
695
696 /*
697 * If we reach here, then the server, the client, and/or the transport
698 * helper does not support protocol v2. --negotiate-only requires
699 * protocol v2.
700 */
701 if (data->transport_options.acked_commits) {
702 warning(_("--negotiate-only requires protocol v2"));
703 return -1;
704 }
705
706 if (!data->get_refs_list_called)
707 get_refs_list_using_list(transport, 0);
708
709 count = 0;
710 for (i = 0; i < nr_heads; i++)
711 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
712 count++;
713
714 if (!count)
715 return 0;
716
717 if (data->check_connectivity &&
718 data->transport_options.check_self_contained_and_connected)
719 set_helper_option(transport, "check-connectivity", "true");
720
721 if (transport->cloning)
722 set_helper_option(transport, "cloning", "true");
723
724 if (data->transport_options.update_shallow)
725 set_helper_option(transport, "update-shallow", "true");
726
727 if (data->transport_options.refetch)
728 set_helper_option(transport, "refetch", "true");
729
730 if (data->transport_options.filter_options.choice) {
731 const char *spec = expand_list_objects_filter_spec(
732 &data->transport_options.filter_options);
733 set_helper_option(transport, "filter", spec);
734 }
735
736 if (data->transport_options.negotiation_tips)
737 warning("Ignoring --negotiation-tip because the protocol does not support it.");
738
739 if (data->fetch)
740 return fetch_with_fetch(transport, nr_heads, to_fetch);
741
742 if (data->import)
743 return fetch_with_import(transport, nr_heads, to_fetch);
744
745 return -1;
746 }
747
748 struct push_update_ref_state {
749 struct ref *hint;
750 struct ref_push_report *report;
751 int new_report;
752 };
753
754 static int push_update_ref_status(struct strbuf *buf,
755 struct push_update_ref_state *state,
756 struct ref *remote_refs)
757 {
758 char *refname, *msg;
759 int status, forced = 0;
760
761 if (starts_with(buf->buf, "option ")) {
762 struct object_id old_oid, new_oid;
763 const char *key, *val;
764 char *p;
765
766 if (!state->hint || !(state->report || state->new_report))
767 die(_("'option' without a matching 'ok/error' directive"));
768 if (state->new_report) {
769 if (!state->hint->report) {
770 CALLOC_ARRAY(state->hint->report, 1);
771 state->report = state->hint->report;
772 } else {
773 state->report = state->hint->report;
774 while (state->report->next)
775 state->report = state->report->next;
776 CALLOC_ARRAY(state->report->next, 1);
777 state->report = state->report->next;
778 }
779 state->new_report = 0;
780 }
781 key = buf->buf + 7;
782 p = strchr(key, ' ');
783 if (p)
784 *p++ = '\0';
785 val = p;
786 if (!strcmp(key, "refname"))
787 state->report->ref_name = xstrdup_or_null(val);
788 else if (!strcmp(key, "old-oid") && val &&
789 !parse_oid_hex(val, &old_oid, &val))
790 state->report->old_oid = oiddup(&old_oid);
791 else if (!strcmp(key, "new-oid") && val &&
792 !parse_oid_hex(val, &new_oid, &val))
793 state->report->new_oid = oiddup(&new_oid);
794 else if (!strcmp(key, "forced-update"))
795 state->report->forced_update = 1;
796 /* Not update remote namespace again. */
797 return 1;
798 }
799
800 state->report = NULL;
801 state->new_report = 0;
802
803 if (starts_with(buf->buf, "ok ")) {
804 status = REF_STATUS_OK;
805 refname = buf->buf + 3;
806 } else if (starts_with(buf->buf, "error ")) {
807 status = REF_STATUS_REMOTE_REJECT;
808 refname = buf->buf + 6;
809 } else
810 die(_("expected ok/error, helper said '%s'"), buf->buf);
811
812 msg = strchr(refname, ' ');
813 if (msg) {
814 struct strbuf msg_buf = STRBUF_INIT;
815 const char *end;
816
817 *msg++ = '\0';
818 if (!unquote_c_style(&msg_buf, msg, &end))
819 msg = strbuf_detach(&msg_buf, NULL);
820 else
821 msg = xstrdup(msg);
822 strbuf_release(&msg_buf);
823
824 if (!strcmp(msg, "no match")) {
825 status = REF_STATUS_NONE;
826 FREE_AND_NULL(msg);
827 }
828 else if (!strcmp(msg, "up to date")) {
829 status = REF_STATUS_UPTODATE;
830 FREE_AND_NULL(msg);
831 }
832 else if (!strcmp(msg, "non-fast forward")) {
833 status = REF_STATUS_REJECT_NONFASTFORWARD;
834 FREE_AND_NULL(msg);
835 }
836 else if (!strcmp(msg, "already exists")) {
837 status = REF_STATUS_REJECT_ALREADY_EXISTS;
838 FREE_AND_NULL(msg);
839 }
840 else if (!strcmp(msg, "fetch first")) {
841 status = REF_STATUS_REJECT_FETCH_FIRST;
842 FREE_AND_NULL(msg);
843 }
844 else if (!strcmp(msg, "needs force")) {
845 status = REF_STATUS_REJECT_NEEDS_FORCE;
846 FREE_AND_NULL(msg);
847 }
848 else if (!strcmp(msg, "stale info")) {
849 status = REF_STATUS_REJECT_STALE;
850 FREE_AND_NULL(msg);
851 }
852 else if (!strcmp(msg, "remote ref updated since checkout")) {
853 status = REF_STATUS_REJECT_REMOTE_UPDATED;
854 FREE_AND_NULL(msg);
855 }
856 else if (!strcmp(msg, "forced update")) {
857 forced = 1;
858 FREE_AND_NULL(msg);
859 }
860 else if (!strcmp(msg, "expecting report")) {
861 status = REF_STATUS_EXPECTING_REPORT;
862 FREE_AND_NULL(msg);
863 }
864 }
865
866 if (state->hint)
867 state->hint = find_ref_by_name(state->hint, refname);
868 if (!state->hint)
869 state->hint = find_ref_by_name(remote_refs, refname);
870 if (!state->hint) {
871 warning(_("helper reported unexpected status of %s"), refname);
872 return 1;
873 }
874
875 if (state->hint->status != REF_STATUS_NONE) {
876 /*
877 * Earlier, the ref was marked not to be pushed, so ignore the ref
878 * status reported by the remote helper if the latter is 'no match'.
879 */
880 if (status == REF_STATUS_NONE)
881 return 1;
882 }
883
884 if (status == REF_STATUS_OK)
885 state->new_report = 1;
886 state->hint->status = status;
887 state->hint->forced_update |= forced;
888 state->hint->remote_status = msg;
889 return !(status == REF_STATUS_OK);
890 }
891
892 static int push_update_refs_status(struct helper_data *data,
893 struct ref *remote_refs,
894 int flags)
895 {
896 struct ref *ref;
897 struct ref_push_report *report;
898 struct strbuf buf = STRBUF_INIT;
899 struct push_update_ref_state state = { remote_refs, NULL, 0 };
900
901 for (;;) {
902 if (recvline(data, &buf)) {
903 strbuf_release(&buf);
904 return 1;
905 }
906 if (!buf.len)
907 break;
908 push_update_ref_status(&buf, &state, remote_refs);
909 }
910 strbuf_release(&buf);
911
912 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
913 return 0;
914
915 /* propagate back the update to the remote namespace */
916 for (ref = remote_refs; ref; ref = ref->next) {
917 char *private;
918
919 if (ref->status != REF_STATUS_OK)
920 continue;
921
922 if (!ref->report) {
923 private = apply_refspecs(&data->rs, ref->name);
924 if (!private)
925 continue;
926 refs_update_ref(get_main_ref_store(the_repository),
927 "update by helper", private,
928 &(ref->new_oid),
929 NULL, 0, 0);
930 free(private);
931 } else {
932 for (report = ref->report; report; report = report->next) {
933 private = apply_refspecs(&data->rs,
934 report->ref_name
935 ? report->ref_name
936 : ref->name);
937 if (!private)
938 continue;
939 refs_update_ref(get_main_ref_store(the_repository),
940 "update by helper", private,
941 report->new_oid
942 ? report->new_oid
943 : &(ref->new_oid),
944 NULL, 0, 0);
945 free(private);
946 }
947 }
948 }
949 return 0;
950 }
951
952 static void set_common_push_options(struct transport *transport,
953 const char *name, int flags)
954 {
955 if (flags & TRANSPORT_PUSH_DRY_RUN) {
956 if (set_helper_option(transport, "dry-run", "true") != 0)
957 die(_("helper %s does not support dry-run"), name);
958 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
959 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
960 die(_("helper %s does not support --signed"), name);
961 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
962 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
963 die(_("helper %s does not support --signed=if-asked"), name);
964 }
965
966 if (flags & TRANSPORT_PUSH_ATOMIC)
967 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
968 die(_("helper %s does not support --atomic"), name);
969
970 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
971 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
972 die(_("helper %s does not support --%s"),
973 name, TRANS_OPT_FORCE_IF_INCLUDES);
974
975 if (flags & TRANSPORT_PUSH_OPTIONS) {
976 struct string_list_item *item;
977 for_each_string_list_item(item, transport->push_options)
978 if (set_helper_option(transport, "push-option", item->string) != 0)
979 die(_("helper %s does not support 'push-option'"), name);
980 }
981 }
982
983 static int push_refs_with_push(struct transport *transport,
984 struct ref *remote_refs, int flags)
985 {
986 int force_all = flags & TRANSPORT_PUSH_FORCE;
987 int mirror = flags & TRANSPORT_PUSH_MIRROR;
988 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
989 struct helper_data *data = transport->data;
990 struct strbuf buf = STRBUF_INIT;
991 struct ref *ref;
992 struct string_list cas_options = STRING_LIST_INIT_DUP;
993 struct string_list_item *cas_option;
994
995 get_helper(transport);
996 if (!data->push)
997 return 1;
998
999 for (ref = remote_refs; ref; ref = ref->next) {
1000 if (!ref->peer_ref && !mirror)
1001 continue;
1002
1003 /* Check for statuses set by set_ref_status_for_push() */
1004 switch (ref->status) {
1005 case REF_STATUS_REJECT_NONFASTFORWARD:
1006 case REF_STATUS_REJECT_STALE:
1007 case REF_STATUS_REJECT_ALREADY_EXISTS:
1008 case REF_STATUS_REJECT_REMOTE_UPDATED:
1009 if (atomic) {
1010 reject_atomic_push(remote_refs, mirror);
1011 string_list_clear(&cas_options, 0);
1012 return 0;
1013 } else
1014 continue;
1015 case REF_STATUS_UPTODATE:
1016 continue;
1017 default:
1018 ; /* do nothing */
1019 }
1020
1021 if (force_all)
1022 ref->force = 1;
1023
1024 strbuf_addstr(&buf, "push ");
1025 if (!ref->deletion) {
1026 if (ref->force)
1027 strbuf_addch(&buf, '+');
1028 if (ref->peer_ref)
1029 strbuf_addstr(&buf, ref->peer_ref->name);
1030 else
1031 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1032 }
1033 strbuf_addch(&buf, ':');
1034 strbuf_addstr(&buf, ref->name);
1035 strbuf_addch(&buf, '\n');
1036
1037 /*
1038 * The "--force-with-lease" options without explicit
1039 * values to expect have already been expanded into
1040 * the ref->old_oid_expect[] field; we can ignore
1041 * transport->smart_options->cas altogether and instead
1042 * can enumerate them from the refs.
1043 */
1044 if (ref->expect_old_sha1) {
1045 struct strbuf cas = STRBUF_INIT;
1046 strbuf_addf(&cas, "%s:%s",
1047 ref->name, oid_to_hex(&ref->old_oid_expect));
1048 string_list_append_nodup(&cas_options,
1049 strbuf_detach(&cas, NULL));
1050 }
1051 }
1052 if (buf.len == 0) {
1053 string_list_clear(&cas_options, 0);
1054 return 0;
1055 }
1056
1057 for_each_string_list_item(cas_option, &cas_options)
1058 set_helper_option(transport, "cas", cas_option->string);
1059 set_common_push_options(transport, data->name, flags);
1060
1061 strbuf_addch(&buf, '\n');
1062 sendline(data, &buf);
1063 strbuf_release(&buf);
1064 string_list_clear(&cas_options, 0);
1065
1066 return push_update_refs_status(data, remote_refs, flags);
1067 }
1068
1069 static int push_refs_with_export(struct transport *transport,
1070 struct ref *remote_refs, int flags)
1071 {
1072 struct ref *ref;
1073 struct child_process *helper, exporter;
1074 struct helper_data *data = transport->data;
1075 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1076 struct strbuf buf = STRBUF_INIT;
1077
1078 if (!data->rs.nr)
1079 die(_("remote-helper doesn't support push; refspec needed"));
1080
1081 set_common_push_options(transport, data->name, flags);
1082 if (flags & TRANSPORT_PUSH_FORCE) {
1083 if (set_helper_option(transport, "force", "true") != 0)
1084 warning(_("helper %s does not support '--force'"), data->name);
1085 }
1086
1087 helper = get_helper(transport);
1088
1089 write_constant(helper->in, "export\n");
1090
1091 for (ref = remote_refs; ref; ref = ref->next) {
1092 char *private;
1093 struct object_id oid;
1094
1095 private = apply_refspecs(&data->rs, ref->name);
1096 if (private && !repo_get_oid(the_repository, private, &oid)) {
1097 strbuf_addf(&buf, "^%s", private);
1098 string_list_append_nodup(&revlist_args,
1099 strbuf_detach(&buf, NULL));
1100 oidcpy(&ref->old_oid, &oid);
1101 }
1102 free(private);
1103
1104 if (ref->peer_ref) {
1105 if (strcmp(ref->name, ref->peer_ref->name)) {
1106 if (!ref->deletion) {
1107 const char *name;
1108 int flag;
1109
1110 /* Follow symbolic refs (mainly for HEAD). */
1111 name = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1112 ref->peer_ref->name,
1113 RESOLVE_REF_READING,
1114 &oid,
1115 &flag);
1116 if (!name || !(flag & REF_ISSYMREF))
1117 name = ref->peer_ref->name;
1118
1119 strbuf_addf(&buf, "%s:%s", name, ref->name);
1120 } else
1121 strbuf_addf(&buf, ":%s", ref->name);
1122
1123 string_list_append(&revlist_args, "--refspec");
1124 string_list_append(&revlist_args, buf.buf);
1125 strbuf_release(&buf);
1126 }
1127 if (!ref->deletion)
1128 string_list_append(&revlist_args, ref->peer_ref->name);
1129 }
1130 }
1131
1132 if (get_exporter(transport, &exporter, &revlist_args))
1133 die(_("couldn't run fast-export"));
1134
1135 string_list_clear(&revlist_args, 1);
1136
1137 if (finish_command(&exporter))
1138 die(_("error while running fast-export"));
1139 if (push_update_refs_status(data, remote_refs, flags))
1140 return 1;
1141
1142 if (data->export_marks) {
1143 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1144 rename(buf.buf, data->export_marks);
1145 strbuf_release(&buf);
1146 }
1147
1148 return 0;
1149 }
1150
1151 static int push_refs(struct transport *transport,
1152 struct ref *remote_refs, int flags)
1153 {
1154 struct helper_data *data = transport->data;
1155
1156 if (process_connect(transport, 1))
1157 return transport->vtable->push_refs(transport, remote_refs, flags);
1158
1159 if (!remote_refs) {
1160 fprintf(stderr,
1161 _("No refs in common and none specified; doing nothing.\n"
1162 "Perhaps you should specify a branch.\n"));
1163 return 0;
1164 }
1165
1166 if (data->push)
1167 return push_refs_with_push(transport, remote_refs, flags);
1168
1169 if (data->export)
1170 return push_refs_with_export(transport, remote_refs, flags);
1171
1172 return -1;
1173 }
1174
1175
1176 static int has_attribute(const char *attrs, const char *attr)
1177 {
1178 int len;
1179 if (!attrs)
1180 return 0;
1181
1182 len = strlen(attr);
1183 for (;;) {
1184 const char *space = strchrnul(attrs, ' ');
1185 if (len == space - attrs && !strncmp(attrs, attr, len))
1186 return 1;
1187 if (!*space)
1188 return 0;
1189 attrs = space + 1;
1190 }
1191 }
1192
1193 static struct ref *get_refs_list(struct transport *transport, int for_push,
1194 struct transport_ls_refs_options *transport_options)
1195 {
1196 get_helper(transport);
1197
1198 if (process_connect(transport, for_push))
1199 return transport->vtable->get_refs_list(transport, for_push,
1200 transport_options);
1201
1202 return get_refs_list_using_list(transport, for_push);
1203 }
1204
1205 static struct ref *get_refs_list_using_list(struct transport *transport,
1206 int for_push)
1207 {
1208 struct helper_data *data = transport->data;
1209 struct child_process *helper;
1210 struct ref *ret = NULL;
1211 struct ref **tail = &ret;
1212 struct ref *posn;
1213 struct strbuf buf = STRBUF_INIT;
1214
1215 data->get_refs_list_called = 1;
1216 helper = get_helper(transport);
1217
1218 if (data->object_format)
1219 set_helper_option(transport, "object-format", "true");
1220
1221 if (data->push && for_push)
1222 write_constant(helper->in, "list for-push\n");
1223 else
1224 write_constant(helper->in, "list\n");
1225
1226 while (1) {
1227 char *eov, *eon;
1228 if (recvline(data, &buf))
1229 exit(128);
1230
1231 if (!*buf.buf)
1232 break;
1233 else if (buf.buf[0] == ':') {
1234 const char *value;
1235 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1236 int algo = hash_algo_by_name(value);
1237 if (algo == GIT_HASH_UNKNOWN)
1238 die(_("unsupported object format '%s'"),
1239 value);
1240 transport->hash_algo = &hash_algos[algo];
1241 }
1242 continue;
1243 }
1244
1245 eov = strchr(buf.buf, ' ');
1246 if (!eov)
1247 die(_("malformed response in ref list: %s"), buf.buf);
1248 eon = strchr(eov + 1, ' ');
1249 *eov = '\0';
1250 if (eon)
1251 *eon = '\0';
1252 *tail = alloc_ref(eov + 1);
1253 if (buf.buf[0] == '@')
1254 (*tail)->symref = xstrdup(buf.buf + 1);
1255 else if (buf.buf[0] != '?')
1256 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1257 if (eon) {
1258 if (has_attribute(eon + 1, "unchanged")) {
1259 (*tail)->status |= REF_STATUS_UPTODATE;
1260 if (refs_read_ref(get_main_ref_store(the_repository), (*tail)->name, &(*tail)->old_oid) < 0)
1261 die(_("could not read ref %s"),
1262 (*tail)->name);
1263 }
1264 }
1265 tail = &((*tail)->next);
1266 }
1267 if (debug)
1268 fprintf(stderr, "Debug: Read ref listing.\n");
1269 strbuf_release(&buf);
1270
1271 for (posn = ret; posn; posn = posn->next)
1272 resolve_remote_symref(posn, ret);
1273
1274 return ret;
1275 }
1276
1277 static int get_bundle_uri(struct transport *transport)
1278 {
1279 get_helper(transport);
1280
1281 if (process_connect(transport, 0))
1282 return transport->vtable->get_bundle_uri(transport);
1283
1284 return -1;
1285 }
1286
1287 static struct transport_vtable vtable = {
1288 .set_option = set_helper_option,
1289 .get_refs_list = get_refs_list,
1290 .get_bundle_uri = get_bundle_uri,
1291 .fetch_refs = fetch_refs,
1292 .push_refs = push_refs,
1293 .connect = connect_helper,
1294 .disconnect = release_helper
1295 };
1296
1297 int transport_helper_init(struct transport *transport, const char *name)
1298 {
1299 struct helper_data *data = xcalloc(1, sizeof(*data));
1300 data->name = name;
1301
1302 transport_check_allowed(name);
1303
1304 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1305 debug = 1;
1306
1307 list_objects_filter_init(&data->transport_options.filter_options);
1308
1309 transport->data = data;
1310 transport->vtable = &vtable;
1311 transport->smart_options = &(data->transport_options);
1312 return 0;
1313 }
1314
1315 /*
1316 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1317 * buffer less), so attempt reads and writes with up to that size.
1318 */
1319 #define BUFFERSIZE 65536
1320 /* This should be enough to hold debugging message. */
1321 #define PBUFFERSIZE 8192
1322
1323 /* Print bidirectional transfer loop debug message. */
1324 __attribute__((format (printf, 1, 2)))
1325 static void transfer_debug(const char *fmt, ...)
1326 {
1327 /*
1328 * NEEDSWORK: This function is sometimes used from multiple threads, and
1329 * we end up using debug_enabled racily. That "should not matter" since
1330 * we always write the same value, but it's still wrong. This function
1331 * is listed in .tsan-suppressions for the time being.
1332 */
1333
1334 va_list args;
1335 char msgbuf[PBUFFERSIZE];
1336 static int debug_enabled = -1;
1337
1338 if (debug_enabled < 0)
1339 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1340 if (!debug_enabled)
1341 return;
1342
1343 va_start(args, fmt);
1344 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1345 va_end(args);
1346 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1347 }
1348
1349 /* Stream state: More data may be coming in this direction. */
1350 #define SSTATE_TRANSFERRING 0
1351 /*
1352 * Stream state: No more data coming in this direction, flushing rest of
1353 * data.
1354 */
1355 #define SSTATE_FLUSHING 1
1356 /* Stream state: Transfer in this direction finished. */
1357 #define SSTATE_FINISHED 2
1358
1359 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1360 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1361 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1362
1363 /* Unidirectional transfer. */
1364 struct unidirectional_transfer {
1365 /* Source */
1366 int src;
1367 /* Destination */
1368 int dest;
1369 /* Is source socket? */
1370 int src_is_sock;
1371 /* Is destination socket? */
1372 int dest_is_sock;
1373 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1374 int state;
1375 /* Buffer. */
1376 char buf[BUFFERSIZE];
1377 /* Buffer used. */
1378 size_t bufuse;
1379 /* Name of source. */
1380 const char *src_name;
1381 /* Name of destination. */
1382 const char *dest_name;
1383 };
1384
1385 /* Closes the target (for writing) if transfer has finished. */
1386 static void udt_close_if_finished(struct unidirectional_transfer *t)
1387 {
1388 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1389 t->state = SSTATE_FINISHED;
1390 if (t->dest_is_sock)
1391 shutdown(t->dest, SHUT_WR);
1392 else
1393 close(t->dest);
1394 transfer_debug("Closed %s.", t->dest_name);
1395 }
1396 }
1397
1398 /*
1399 * Tries to read data from source into buffer. If buffer is full,
1400 * no data is read. Returns 0 on success, -1 on error.
1401 */
1402 static int udt_do_read(struct unidirectional_transfer *t)
1403 {
1404 ssize_t bytes;
1405
1406 if (t->bufuse == BUFFERSIZE)
1407 return 0; /* No space for more. */
1408
1409 transfer_debug("%s is readable", t->src_name);
1410 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1411 if (bytes < 0) {
1412 error_errno(_("read(%s) failed"), t->src_name);
1413 return -1;
1414 } else if (bytes == 0) {
1415 transfer_debug("%s EOF (with %i bytes in buffer)",
1416 t->src_name, (int)t->bufuse);
1417 t->state = SSTATE_FLUSHING;
1418 } else if (bytes > 0) {
1419 t->bufuse += bytes;
1420 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1421 (int)bytes, t->src_name, (int)t->bufuse);
1422 }
1423 return 0;
1424 }
1425
1426 /* Tries to write data from buffer into destination. If buffer is empty,
1427 * no data is written. Returns 0 on success, -1 on error.
1428 */
1429 static int udt_do_write(struct unidirectional_transfer *t)
1430 {
1431 ssize_t bytes;
1432
1433 if (t->bufuse == 0)
1434 return 0; /* Nothing to write. */
1435
1436 transfer_debug("%s is writable", t->dest_name);
1437 bytes = xwrite(t->dest, t->buf, t->bufuse);
1438 if (bytes < 0) {
1439 error_errno(_("write(%s) failed"), t->dest_name);
1440 return -1;
1441 } else if (bytes > 0) {
1442 t->bufuse -= bytes;
1443 if (t->bufuse)
1444 memmove(t->buf, t->buf + bytes, t->bufuse);
1445 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1446 (int)bytes, t->dest_name, (int)t->bufuse);
1447 }
1448 return 0;
1449 }
1450
1451
1452 /* State of bidirectional transfer loop. */
1453 struct bidirectional_transfer_state {
1454 /* Direction from program to git. */
1455 struct unidirectional_transfer ptg;
1456 /* Direction from git to program. */
1457 struct unidirectional_transfer gtp;
1458 };
1459
1460 static void *udt_copy_task_routine(void *udt)
1461 {
1462 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1463 while (t->state != SSTATE_FINISHED) {
1464 if (STATE_NEEDS_READING(t->state))
1465 if (udt_do_read(t))
1466 return NULL;
1467 if (STATE_NEEDS_WRITING(t->state))
1468 if (udt_do_write(t))
1469 return NULL;
1470 if (STATE_NEEDS_CLOSING(t->state))
1471 udt_close_if_finished(t);
1472 }
1473 return udt; /* Just some non-NULL value. */
1474 }
1475
1476 #ifndef NO_PTHREADS
1477
1478 /*
1479 * Join thread, with appropriate errors on failure. Name is name for the
1480 * thread (for error messages). Returns 0 on success, 1 on failure.
1481 */
1482 static int tloop_join(pthread_t thread, const char *name)
1483 {
1484 int err;
1485 void *tret;
1486 err = pthread_join(thread, &tret);
1487 if (!tret) {
1488 error(_("%s thread failed"), name);
1489 return 1;
1490 }
1491 if (err) {
1492 error(_("%s thread failed to join: %s"), name, strerror(err));
1493 return 1;
1494 }
1495 return 0;
1496 }
1497
1498 /*
1499 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1500 * -1 on failure.
1501 */
1502 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1503 {
1504 pthread_t gtp_thread;
1505 pthread_t ptg_thread;
1506 int err;
1507 int ret = 0;
1508 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1509 &s->gtp);
1510 if (err)
1511 die(_("can't start thread for copying data: %s"), strerror(err));
1512 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1513 &s->ptg);
1514 if (err)
1515 die(_("can't start thread for copying data: %s"), strerror(err));
1516
1517 ret |= tloop_join(gtp_thread, "Git to program copy");
1518 ret |= tloop_join(ptg_thread, "Program to git copy");
1519 return ret;
1520 }
1521 #else
1522
1523 /* Close the source and target (for writing) for transfer. */
1524 static void udt_kill_transfer(struct unidirectional_transfer *t)
1525 {
1526 t->state = SSTATE_FINISHED;
1527 /*
1528 * Socket read end left open isn't a disaster if nobody
1529 * attempts to read from it (mingw compat headers do not
1530 * have SHUT_RD)...
1531 *
1532 * We can't fully close the socket since otherwise gtp
1533 * task would first close the socket it sends data to
1534 * while closing the ptg file descriptors.
1535 */
1536 if (!t->src_is_sock)
1537 close(t->src);
1538 if (t->dest_is_sock)
1539 shutdown(t->dest, SHUT_WR);
1540 else
1541 close(t->dest);
1542 }
1543
1544 /*
1545 * Join process, with appropriate errors on failure. Name is name for the
1546 * process (for error messages). Returns 0 on success, 1 on failure.
1547 */
1548 static int tloop_join(pid_t pid, const char *name)
1549 {
1550 int tret;
1551 if (waitpid(pid, &tret, 0) < 0) {
1552 error_errno(_("%s process failed to wait"), name);
1553 return 1;
1554 }
1555 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1556 error(_("%s process failed"), name);
1557 return 1;
1558 }
1559 return 0;
1560 }
1561
1562 /*
1563 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1564 * -1 on failure.
1565 */
1566 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1567 {
1568 pid_t pid1, pid2;
1569 int ret = 0;
1570
1571 /* Fork thread #1: git to program. */
1572 pid1 = fork();
1573 if (pid1 < 0)
1574 die_errno(_("can't start thread for copying data"));
1575 else if (pid1 == 0) {
1576 udt_kill_transfer(&s->ptg);
1577 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1578 }
1579
1580 /* Fork thread #2: program to git. */
1581 pid2 = fork();
1582 if (pid2 < 0)
1583 die_errno(_("can't start thread for copying data"));
1584 else if (pid2 == 0) {
1585 udt_kill_transfer(&s->gtp);
1586 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1587 }
1588
1589 /*
1590 * Close both streams in parent as to not interfere with
1591 * end of file detection and wait for both tasks to finish.
1592 */
1593 udt_kill_transfer(&s->gtp);
1594 udt_kill_transfer(&s->ptg);
1595 ret |= tloop_join(pid1, "Git to program copy");
1596 ret |= tloop_join(pid2, "Program to git copy");
1597 return ret;
1598 }
1599 #endif
1600
1601 /*
1602 * Copies data from stdin to output and from input to stdout simultaneously.
1603 * Additionally filtering through given filter. If filter is NULL, uses
1604 * identity filter.
1605 */
1606 int bidirectional_transfer_loop(int input, int output)
1607 {
1608 struct bidirectional_transfer_state state;
1609
1610 /* Fill the state fields. */
1611 state.ptg.src = input;
1612 state.ptg.dest = 1;
1613 state.ptg.src_is_sock = (input == output);
1614 state.ptg.dest_is_sock = 0;
1615 state.ptg.state = SSTATE_TRANSFERRING;
1616 state.ptg.bufuse = 0;
1617 state.ptg.src_name = "remote input";
1618 state.ptg.dest_name = "stdout";
1619
1620 state.gtp.src = 0;
1621 state.gtp.dest = output;
1622 state.gtp.src_is_sock = 0;
1623 state.gtp.dest_is_sock = (input == output);
1624 state.gtp.state = SSTATE_TRANSFERRING;
1625 state.gtp.bufuse = 0;
1626 state.gtp.src_name = "stdin";
1627 state.gtp.dest_name = "remote output";
1628
1629 return tloop_spawnwait_tasks(&state);
1630 }
1631
1632 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1633 {
1634 struct ref *ref;
1635
1636 /* Mark other refs as failed */
1637 for (ref = remote_refs; ref; ref = ref->next) {
1638 if (!ref->peer_ref && !mirror_mode)
1639 continue;
1640
1641 switch (ref->status) {
1642 case REF_STATUS_NONE:
1643 case REF_STATUS_OK:
1644 case REF_STATUS_EXPECTING_REPORT:
1645 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1646 continue;
1647 default:
1648 break; /* do nothing */
1649 }
1650 }
1651 return;
1652 }
Mirror of Junio's Git repository with all the branches