summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
The sixteenth batch
[git/gitster.git] / transport-helper.c
blob0789e5bca53282d29f30eea9a2eca129e115f40f
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 int write_constant_gently(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 return -1;
98 return 0;
99 }
100
101 static void write_constant(int fd, const char *str)
102 {
103 if (write_constant_gently(fd, str) < 0)
104 die_errno(_("full write to remote helper failed"));
105 }
106
107 static const char *remove_ext_force(const char *url)
108 {
109 if (url) {
110 const char *colon = strchr(url, ':');
111 if (colon && colon[1] == ':')
112 return colon + 2;
113 }
114 return url;
115 }
116
117 static void do_take_over(struct transport *transport)
118 {
119 struct helper_data *data;
120 data = (struct helper_data *)transport->data;
121 transport_take_over(transport, data->helper);
122 fclose(data->out);
123 free(data->name);
124 free(data);
125 }
126
127 static void standard_options(struct transport *t);
128
129 static struct child_process *get_helper(struct transport *transport)
130 {
131 struct helper_data *data = transport->data;
132 struct strbuf buf = STRBUF_INIT;
133 struct child_process *helper;
134 int duped;
135 int code;
136
137 if (data->helper)
138 return data->helper;
139
140 helper = xmalloc(sizeof(*helper));
141 child_process_init(helper);
142 helper->in = -1;
143 helper->out = -1;
144 helper->err = 0;
145 strvec_pushf(&helper->args, "remote-%s", data->name);
146 strvec_push(&helper->args, transport->remote->name);
147 strvec_push(&helper->args, remove_ext_force(transport->url));
148 helper->git_cmd = 1;
149 helper->silent_exec_failure = 1;
150
151 if (have_git_dir())
152 strvec_pushf(&helper->env, "%s=%s",
153 GIT_DIR_ENVIRONMENT, repo_get_git_dir(the_repository));
154
155 helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */
156
157 code = start_command(helper);
158 if (code < 0 && errno == ENOENT)
159 die(_("unable to find remote helper for '%s'"), data->name);
160 else if (code != 0)
161 exit(code);
162
163 data->helper = helper;
164 data->no_disconnect_req = 0;
165 refspec_init_fetch(&data->rs);
166
167 /*
168 * Open the output as FILE* so strbuf_getline_*() family of
169 * functions can be used.
170 * Do this with duped fd because fclose() will close the fd,
171 * and stuff like taking over will require the fd to remain.
172 */
173 duped = dup(helper->out);
174 if (duped < 0)
175 die_errno(_("can't dup helper output fd"));
176 data->out = xfdopen(duped, "r");
177
178 sigchain_push(SIGPIPE, SIG_IGN);
179 if (write_constant_gently(helper->in, "capabilities\n") < 0)
180 die("remote helper '%s' aborted session", data->name);
181 sigchain_pop(SIGPIPE);
182
183 while (1) {
184 const char *capname, *arg;
185 int mandatory = 0;
186 if (recvline(data, &buf))
187 die("remote helper '%s' aborted session", data->name);
188
189 if (!*buf.buf)
190 break;
191
192 if (*buf.buf == '*') {
193 capname = buf.buf + 1;
194 mandatory = 1;
195 } else
196 capname = buf.buf;
197
198 if (debug)
199 fprintf(stderr, "Debug: Got cap %s\n", capname);
200 if (!strcmp(capname, "fetch"))
201 data->fetch = 1;
202 else if (!strcmp(capname, "option"))
203 data->option = 1;
204 else if (!strcmp(capname, "push"))
205 data->push = 1;
206 else if (!strcmp(capname, "import"))
207 data->import = 1;
208 else if (!strcmp(capname, "bidi-import"))
209 data->bidi_import = 1;
210 else if (!strcmp(capname, "export"))
211 data->export = 1;
212 else if (!strcmp(capname, "check-connectivity"))
213 data->check_connectivity = 1;
214 else if (skip_prefix(capname, "refspec ", &arg)) {
215 refspec_append(&data->rs, arg);
216 } else if (!strcmp(capname, "connect")) {
217 data->connect = 1;
218 } else if (!strcmp(capname, "stateless-connect")) {
219 data->stateless_connect = 1;
220 } else if (!strcmp(capname, "signed-tags")) {
221 data->signed_tags = 1;
222 } else if (skip_prefix(capname, "export-marks ", &arg)) {
223 data->export_marks = xstrdup(arg);
224 } else if (skip_prefix(capname, "import-marks ", &arg)) {
225 data->import_marks = xstrdup(arg);
226 } else if (starts_with(capname, "no-private-update")) {
227 data->no_private_update = 1;
228 } else if (starts_with(capname, "object-format")) {
229 data->object_format = 1;
230 } else if (mandatory) {
231 die(_("unknown mandatory capability %s; this remote "
232 "helper probably needs newer version of Git"),
233 capname);
234 }
235 }
236 if (!data->rs.nr && (data->import || data->bidi_import || data->export)) {
237 warning(_("this remote helper should implement refspec capability"));
238 }
239 strbuf_release(&buf);
240 if (debug)
241 fprintf(stderr, "Debug: Capabilities complete.\n");
242 standard_options(transport);
243 return data->helper;
244 }
245
246 static int disconnect_helper(struct transport *transport)
247 {
248 struct helper_data *data = transport->data;
249 int res = 0;
250
251 if (data->helper) {
252 if (debug)
253 fprintf(stderr, "Debug: Disconnecting.\n");
254 if (!data->no_disconnect_req) {
255 /*
256 * Ignore write errors; there's nothing we can do,
257 * since we're about to close the pipe anyway. And the
258 * most likely error is EPIPE due to the helper dying
259 * to report an error itself.
260 */
261 sigchain_push(SIGPIPE, SIG_IGN);
262 xwrite(data->helper->in, "\n", 1);
263 sigchain_pop(SIGPIPE);
264 }
265 close(data->helper->in);
266 close(data->helper->out);
267 fclose(data->out);
268 res = finish_command(data->helper);
269 FREE_AND_NULL(data->name);
270 FREE_AND_NULL(data->helper);
271 }
272 return res;
273 }
274
275 static const char *unsupported_options[] = {
276 TRANS_OPT_UPLOADPACK,
277 TRANS_OPT_RECEIVEPACK,
278 TRANS_OPT_THIN,
279 TRANS_OPT_KEEP
280 };
281
282 static const char *boolean_options[] = {
283 TRANS_OPT_THIN,
284 TRANS_OPT_KEEP,
285 TRANS_OPT_FOLLOWTAGS,
286 TRANS_OPT_DEEPEN_RELATIVE
287 };
288
289 static int strbuf_set_helper_option(struct helper_data *data,
290 struct strbuf *buf)
291 {
292 int ret;
293
294 sendline(data, buf);
295 if (recvline(data, buf))
296 exit(128);
297
298 if (!strcmp(buf->buf, "ok"))
299 ret = 0;
300 else if (starts_with(buf->buf, "error"))
301 ret = -1;
302 else if (!strcmp(buf->buf, "unsupported"))
303 ret = 1;
304 else {
305 warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf);
306 ret = 1;
307 }
308 return ret;
309 }
310
311 static int string_list_set_helper_option(struct helper_data *data,
312 const char *name,
313 struct string_list *list)
314 {
315 struct strbuf buf = STRBUF_INIT;
316 int ret = 0;
317
318 for (size_t i = 0; i < list->nr; i++) {
319 strbuf_addf(&buf, "option %s ", name);
320 quote_c_style(list->items[i].string, &buf, NULL, 0);
321 strbuf_addch(&buf, '\n');
322
323 if ((ret = strbuf_set_helper_option(data, &buf)))
324 break;
325 strbuf_reset(&buf);
326 }
327 strbuf_release(&buf);
328 return ret;
329 }
330
331 static int set_helper_option(struct transport *transport,
332 const char *name, const char *value)
333 {
334 struct helper_data *data = transport->data;
335 struct strbuf buf = STRBUF_INIT;
336 int ret, is_bool = 0;
337
338 get_helper(transport);
339
340 if (!data->option)
341 return 1;
342
343 if (!strcmp(name, "deepen-not"))
344 return string_list_set_helper_option(data, name,
345 (struct string_list *)value);
346
347 for (size_t i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
348 if (!strcmp(name, unsupported_options[i]))
349 return 1;
350 }
351
352 for (size_t i = 0; i < ARRAY_SIZE(boolean_options); i++) {
353 if (!strcmp(name, boolean_options[i])) {
354 is_bool = 1;
355 break;
356 }
357 }
358
359 strbuf_addf(&buf, "option %s ", name);
360 if (is_bool)
361 strbuf_addstr(&buf, value ? "true" : "false");
362 else
363 quote_c_style(value, &buf, NULL, 0);
364 strbuf_addch(&buf, '\n');
365
366 ret = strbuf_set_helper_option(data, &buf);
367 strbuf_release(&buf);
368 return ret;
369 }
370
371 static void standard_options(struct transport *t)
372 {
373 char buf[16];
374 int v = t->verbose;
375
376 set_helper_option(t, "progress", t->progress ? "true" : "false");
377
378 xsnprintf(buf, sizeof(buf), "%d", v + 1);
379 set_helper_option(t, "verbosity", buf);
380
381 switch (t->family) {
382 case TRANSPORT_FAMILY_ALL:
383 /*
384 * this is already the default,
385 * do not break old remote helpers by setting "all" here
386 */
387 break;
388 case TRANSPORT_FAMILY_IPV4:
389 set_helper_option(t, "family", "ipv4");
390 break;
391 case TRANSPORT_FAMILY_IPV6:
392 set_helper_option(t, "family", "ipv6");
393 break;
394 }
395 }
396
397 static int release_helper(struct transport *transport)
398 {
399 int res = 0;
400 struct helper_data *data = transport->data;
401 refspec_clear(&data->rs);
402 free(data->import_marks);
403 free(data->export_marks);
404 res = disconnect_helper(transport);
405 free(transport->data);
406 return res;
407 }
408
409 static int fetch_with_fetch(struct transport *transport,
410 int nr_heads, struct ref **to_fetch)
411 {
412 struct helper_data *data = transport->data;
413 int i;
414 struct strbuf buf = STRBUF_INIT;
415
416 for (i = 0; i < nr_heads; i++) {
417 const struct ref *posn = to_fetch[i];
418 if (posn->status & REF_STATUS_UPTODATE)
419 continue;
420
421 strbuf_addf(&buf, "fetch %s %s\n",
422 oid_to_hex(&posn->old_oid),
423 posn->symref ? posn->symref : posn->name);
424 }
425
426 strbuf_addch(&buf, '\n');
427 sendline(data, &buf);
428
429 while (1) {
430 const char *name;
431
432 if (recvline(data, &buf))
433 exit(128);
434
435 if (skip_prefix(buf.buf, "lock ", &name)) {
436 if (transport->pack_lockfiles.nr)
437 warning(_("%s also locked %s"), data->name, name);
438 else
439 string_list_append(&transport->pack_lockfiles,
440 name);
441 }
442 else if (data->check_connectivity &&
443 data->transport_options.check_self_contained_and_connected &&
444 !strcmp(buf.buf, "connectivity-ok"))
445 data->transport_options.self_contained_and_connected = 1;
446 else if (!buf.len)
447 break;
448 else
449 warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf);
450 }
451 strbuf_release(&buf);
452
453 reprepare_packed_git(the_repository);
454 return 0;
455 }
456
457 static int get_importer(struct transport *transport, struct child_process *fastimport)
458 {
459 struct child_process *helper = get_helper(transport);
460 struct helper_data *data = transport->data;
461 int cat_blob_fd, code;
462 child_process_init(fastimport);
463 fastimport->in = xdup(helper->out);
464 strvec_push(&fastimport->args, "fast-import");
465 strvec_push(&fastimport->args, "--allow-unsafe-features");
466 strvec_push(&fastimport->args, debug ? "--stats" : "--quiet");
467
468 if (data->bidi_import) {
469 cat_blob_fd = xdup(helper->in);
470 strvec_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
471 }
472 fastimport->git_cmd = 1;
473
474 code = start_command(fastimport);
475 return code;
476 }
477
478 static int get_exporter(struct transport *transport,
479 struct child_process *fastexport,
480 struct string_list *revlist_args)
481 {
482 struct helper_data *data = transport->data;
483 struct child_process *helper = get_helper(transport);
484
485 child_process_init(fastexport);
486
487 /* we need to duplicate helper->in because we want to use it after
488 * fastexport is done with it. */
489 fastexport->out = dup(helper->in);
490 strvec_push(&fastexport->args, "fast-export");
491 strvec_push(&fastexport->args, "--use-done-feature");
492 strvec_push(&fastexport->args, data->signed_tags ?
493 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
494 if (data->export_marks)
495 strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
496 if (data->import_marks)
497 strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
498
499 for (size_t i = 0; i < revlist_args->nr; i++)
500 strvec_push(&fastexport->args, revlist_args->items[i].string);
501
502 fastexport->git_cmd = 1;
503 return start_command(fastexport);
504 }
505
506 static int fetch_with_import(struct transport *transport,
507 int nr_heads, struct ref **to_fetch)
508 {
509 struct child_process fastimport;
510 struct helper_data *data = transport->data;
511 int i;
512 struct ref *posn;
513 struct strbuf buf = STRBUF_INIT;
514
515 get_helper(transport);
516
517 if (get_importer(transport, &fastimport))
518 die(_("couldn't run fast-import"));
519
520 for (i = 0; i < nr_heads; i++) {
521 posn = to_fetch[i];
522 if (posn->status & REF_STATUS_UPTODATE)
523 continue;
524
525 strbuf_addf(&buf, "import %s\n",
526 posn->symref ? posn->symref : posn->name);
527 sendline(data, &buf);
528 strbuf_reset(&buf);
529 }
530
531 write_constant(data->helper->in, "\n");
532 /*
533 * remote-helpers that advertise the bidi-import capability are required to
534 * buffer the complete batch of import commands until this newline before
535 * sending data to fast-import.
536 * These helpers read back data from fast-import on their stdin, which could
537 * be mixed with import commands, otherwise.
538 */
539
540 if (finish_command(&fastimport))
541 die(_("error while running fast-import"));
542
543 /*
544 * The fast-import stream of a remote helper that advertises
545 * the "refspec" capability writes to the refs named after the
546 * right hand side of the first refspec matching each ref we
547 * were fetching.
548 *
549 * (If no "refspec" capability was specified, for historical
550 * reasons we default to the equivalent of *:*.)
551 *
552 * Store the result in to_fetch[i].old_sha1. Callers such
553 * as "git fetch" can use the value to write feedback to the
554 * terminal, populate FETCH_HEAD, and determine what new value
555 * should be written to peer_ref if the update is a
556 * fast-forward or this is a forced update.
557 */
558 for (i = 0; i < nr_heads; i++) {
559 char *private, *name;
560 posn = to_fetch[i];
561 if (posn->status & REF_STATUS_UPTODATE)
562 continue;
563 name = posn->symref ? posn->symref : posn->name;
564 if (data->rs.nr)
565 private = apply_refspecs(&data->rs, name);
566 else
567 private = xstrdup(name);
568 if (private) {
569 if (refs_read_ref(get_main_ref_store(the_repository), private, &posn->old_oid) < 0)
570 die(_("could not read ref %s"), private);
571 free(private);
572 }
573 }
574 strbuf_release(&buf);
575 return 0;
576 }
577
578 static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
579 {
580 struct helper_data *data = transport->data;
581 int ret = 0;
582 int duped;
583 FILE *input;
584 struct child_process *helper;
585
586 helper = get_helper(transport);
587
588 /*
589 * Yes, dup the pipe another time, as we need unbuffered version
590 * of input pipe as FILE*. fclose() closes the underlying fd and
591 * stream buffering only can be changed before first I/O operation
592 * on it.
593 */
594 duped = dup(helper->out);
595 if (duped < 0)
596 die_errno(_("can't dup helper output fd"));
597 input = xfdopen(duped, "r");
598 setvbuf(input, NULL, _IONBF, 0);
599
600 sendline(data, cmdbuf);
601 if (recvline_fh(input, cmdbuf))
602 exit(128);
603
604 if (!strcmp(cmdbuf->buf, "")) {
605 data->no_disconnect_req = 1;
606 if (debug)
607 fprintf(stderr, "Debug: Smart transport connection "
608 "ready.\n");
609 ret = 1;
610 } else if (!strcmp(cmdbuf->buf, "fallback")) {
611 if (debug)
612 fprintf(stderr, "Debug: Falling back to dumb "
613 "transport.\n");
614 } else {
615 die(_("unknown response to connect: %s"),
616 cmdbuf->buf);
617 }
618
619 fclose(input);
620 return ret;
621 }
622
623 static int process_connect_service(struct transport *transport,
624 const char *name, const char *exec)
625 {
626 struct helper_data *data = transport->data;
627 struct strbuf cmdbuf = STRBUF_INIT;
628 int ret = 0;
629
630 /*
631 * Handle --upload-pack and friends. This is fire and forget...
632 * just warn if it fails.
633 */
634 if (strcmp(name, exec)) {
635 int r = set_helper_option(transport, "servpath", exec);
636 if (r > 0)
637 warning(_("setting remote service path not supported by protocol"));
638 else if (r < 0)
639 warning(_("invalid remote service path"));
640 }
641
642 if (data->connect) {
643 strbuf_addf(&cmdbuf, "connect %s\n", name);
644 ret = run_connect(transport, &cmdbuf);
645 } else if (data->stateless_connect &&
646 (get_protocol_version_config() == protocol_v2) &&
647 (!strcmp("git-upload-pack", name) ||
648 !strcmp("git-upload-archive", name))) {
649 strbuf_addf(&cmdbuf, "stateless-connect %s\n", name);
650 ret = run_connect(transport, &cmdbuf);
651 if (ret)
652 transport->stateless_rpc = 1;
653 }
654
655 strbuf_release(&cmdbuf);
656 return ret;
657 }
658
659 static int process_connect(struct transport *transport,
660 int for_push)
661 {
662 struct helper_data *data = transport->data;
663 const char *name;
664 const char *exec;
665 int ret;
666
667 name = for_push ? "git-receive-pack" : "git-upload-pack";
668 if (for_push)
669 exec = data->transport_options.receivepack;
670 else
671 exec = data->transport_options.uploadpack;
672
673 ret = process_connect_service(transport, name, exec);
674 if (ret)
675 do_take_over(transport);
676 return ret;
677 }
678
679 static int connect_helper(struct transport *transport, const char *name,
680 const char *exec, int fd[2])
681 {
682 struct helper_data *data = transport->data;
683
684 /* Get_helper so connect is inited. */
685 get_helper(transport);
686
687 if (!process_connect_service(transport, name, exec))
688 die(_("can't connect to subservice %s"), name);
689
690 fd[0] = data->helper->out;
691 fd[1] = data->helper->in;
692
693 do_take_over(transport);
694 return 0;
695 }
696
697 static struct ref *get_refs_list_using_list(struct transport *transport,
698 int for_push);
699
700 static int fetch_refs(struct transport *transport,
701 int nr_heads, struct ref **to_fetch)
702 {
703 struct helper_data *data = transport->data;
704 int i, count;
705
706 get_helper(transport);
707
708 if (process_connect(transport, 0))
709 return transport->vtable->fetch_refs(transport, nr_heads, to_fetch);
710
711 /*
712 * If we reach here, then the server, the client, and/or the transport
713 * helper does not support protocol v2. --negotiate-only requires
714 * protocol v2.
715 */
716 if (data->transport_options.acked_commits) {
717 warning(_("--negotiate-only requires protocol v2"));
718 return -1;
719 }
720
721 if (!data->get_refs_list_called) {
722 /*
723 * We do not care about the list of refs returned, but only
724 * that the "list" command was sent.
725 */
726 struct ref *dummy = get_refs_list_using_list(transport, 0);
727 free_refs(dummy);
728 }
729
730 count = 0;
731 for (i = 0; i < nr_heads; i++)
732 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
733 count++;
734
735 if (!count)
736 return 0;
737
738 if (data->check_connectivity &&
739 data->transport_options.check_self_contained_and_connected)
740 set_helper_option(transport, "check-connectivity", "true");
741
742 if (transport->cloning)
743 set_helper_option(transport, "cloning", "true");
744
745 if (data->transport_options.update_shallow)
746 set_helper_option(transport, "update-shallow", "true");
747
748 if (data->transport_options.refetch)
749 set_helper_option(transport, "refetch", "true");
750
751 if (data->transport_options.filter_options.choice) {
752 const char *spec = expand_list_objects_filter_spec(
753 &data->transport_options.filter_options);
754 set_helper_option(transport, "filter", spec);
755 }
756
757 if (data->transport_options.negotiation_tips)
758 warning("Ignoring --negotiation-tip because the protocol does not support it.");
759
760 if (data->fetch)
761 return fetch_with_fetch(transport, nr_heads, to_fetch);
762
763 if (data->import)
764 return fetch_with_import(transport, nr_heads, to_fetch);
765
766 return -1;
767 }
768
769 struct push_update_ref_state {
770 struct ref *hint;
771 struct ref_push_report *report;
772 int new_report;
773 };
774
775 static int push_update_ref_status(struct strbuf *buf,
776 struct push_update_ref_state *state,
777 struct ref *remote_refs)
778 {
779 char *refname, *msg;
780 int status, forced = 0;
781
782 if (starts_with(buf->buf, "option ")) {
783 struct object_id old_oid, new_oid;
784 const char *key, *val;
785 char *p;
786
787 if (!state->hint || !(state->report || state->new_report))
788 die(_("'option' without a matching 'ok/error' directive"));
789 if (state->new_report) {
790 if (!state->hint->report) {
791 CALLOC_ARRAY(state->hint->report, 1);
792 state->report = state->hint->report;
793 } else {
794 state->report = state->hint->report;
795 while (state->report->next)
796 state->report = state->report->next;
797 CALLOC_ARRAY(state->report->next, 1);
798 state->report = state->report->next;
799 }
800 state->new_report = 0;
801 }
802 key = buf->buf + 7;
803 p = strchr(key, ' ');
804 if (p)
805 *p++ = '\0';
806 val = p;
807 if (!strcmp(key, "refname"))
808 state->report->ref_name = xstrdup_or_null(val);
809 else if (!strcmp(key, "old-oid") && val &&
810 !parse_oid_hex(val, &old_oid, &val))
811 state->report->old_oid = oiddup(&old_oid);
812 else if (!strcmp(key, "new-oid") && val &&
813 !parse_oid_hex(val, &new_oid, &val))
814 state->report->new_oid = oiddup(&new_oid);
815 else if (!strcmp(key, "forced-update"))
816 state->report->forced_update = 1;
817 /* Not update remote namespace again. */
818 return 1;
819 }
820
821 state->report = NULL;
822 state->new_report = 0;
823
824 if (starts_with(buf->buf, "ok ")) {
825 status = REF_STATUS_OK;
826 refname = buf->buf + 3;
827 } else if (starts_with(buf->buf, "error ")) {
828 status = REF_STATUS_REMOTE_REJECT;
829 refname = buf->buf + 6;
830 } else
831 die(_("expected ok/error, helper said '%s'"), buf->buf);
832
833 msg = strchr(refname, ' ');
834 if (msg) {
835 struct strbuf msg_buf = STRBUF_INIT;
836 const char *end;
837
838 *msg++ = '\0';
839 if (!unquote_c_style(&msg_buf, msg, &end))
840 msg = strbuf_detach(&msg_buf, NULL);
841 else
842 msg = xstrdup(msg);
843 strbuf_release(&msg_buf);
844
845 if (!strcmp(msg, "no match")) {
846 status = REF_STATUS_NONE;
847 FREE_AND_NULL(msg);
848 }
849 else if (!strcmp(msg, "up to date")) {
850 status = REF_STATUS_UPTODATE;
851 FREE_AND_NULL(msg);
852 }
853 else if (!strcmp(msg, "non-fast forward")) {
854 status = REF_STATUS_REJECT_NONFASTFORWARD;
855 FREE_AND_NULL(msg);
856 }
857 else if (!strcmp(msg, "already exists")) {
858 status = REF_STATUS_REJECT_ALREADY_EXISTS;
859 FREE_AND_NULL(msg);
860 }
861 else if (!strcmp(msg, "fetch first")) {
862 status = REF_STATUS_REJECT_FETCH_FIRST;
863 FREE_AND_NULL(msg);
864 }
865 else if (!strcmp(msg, "needs force")) {
866 status = REF_STATUS_REJECT_NEEDS_FORCE;
867 FREE_AND_NULL(msg);
868 }
869 else if (!strcmp(msg, "stale info")) {
870 status = REF_STATUS_REJECT_STALE;
871 FREE_AND_NULL(msg);
872 }
873 else if (!strcmp(msg, "remote ref updated since checkout")) {
874 status = REF_STATUS_REJECT_REMOTE_UPDATED;
875 FREE_AND_NULL(msg);
876 }
877 else if (!strcmp(msg, "forced update")) {
878 forced = 1;
879 FREE_AND_NULL(msg);
880 }
881 else if (!strcmp(msg, "expecting report")) {
882 status = REF_STATUS_EXPECTING_REPORT;
883 FREE_AND_NULL(msg);
884 }
885 }
886
887 if (state->hint)
888 state->hint = find_ref_by_name(state->hint, refname);
889 if (!state->hint)
890 state->hint = find_ref_by_name(remote_refs, refname);
891 if (!state->hint) {
892 warning(_("helper reported unexpected status of %s"), refname);
893 return 1;
894 }
895
896 if (state->hint->status != REF_STATUS_NONE) {
897 /*
898 * Earlier, the ref was marked not to be pushed, so ignore the ref
899 * status reported by the remote helper if the latter is 'no match'.
900 */
901 if (status == REF_STATUS_NONE)
902 return 1;
903 }
904
905 if (status == REF_STATUS_OK)
906 state->new_report = 1;
907 state->hint->status = status;
908 state->hint->forced_update |= forced;
909 state->hint->remote_status = msg;
910 return !(status == REF_STATUS_OK);
911 }
912
913 static int push_update_refs_status(struct helper_data *data,
914 struct ref *remote_refs,
915 int flags)
916 {
917 struct ref *ref;
918 struct ref_push_report *report;
919 struct strbuf buf = STRBUF_INIT;
920 struct push_update_ref_state state = { remote_refs, NULL, 0 };
921
922 for (;;) {
923 if (recvline(data, &buf)) {
924 strbuf_release(&buf);
925 return 1;
926 }
927 if (!buf.len)
928 break;
929 push_update_ref_status(&buf, &state, remote_refs);
930 }
931 strbuf_release(&buf);
932
933 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
934 return 0;
935
936 /* propagate back the update to the remote namespace */
937 for (ref = remote_refs; ref; ref = ref->next) {
938 char *private;
939
940 if (ref->status != REF_STATUS_OK)
941 continue;
942
943 if (!ref->report) {
944 private = apply_refspecs(&data->rs, ref->name);
945 if (!private)
946 continue;
947 refs_update_ref(get_main_ref_store(the_repository),
948 "update by helper", private,
949 &(ref->new_oid),
950 NULL, 0, 0);
951 free(private);
952 } else {
953 for (report = ref->report; report; report = report->next) {
954 private = apply_refspecs(&data->rs,
955 report->ref_name
956 ? report->ref_name
957 : ref->name);
958 if (!private)
959 continue;
960 refs_update_ref(get_main_ref_store(the_repository),
961 "update by helper", private,
962 report->new_oid
963 ? report->new_oid
964 : &(ref->new_oid),
965 NULL, 0, 0);
966 free(private);
967 }
968 }
969 }
970 return 0;
971 }
972
973 static void set_common_push_options(struct transport *transport,
974 const char *name, int flags)
975 {
976 if (flags & TRANSPORT_PUSH_DRY_RUN) {
977 if (set_helper_option(transport, "dry-run", "true") != 0)
978 die(_("helper %s does not support dry-run"), name);
979 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
980 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
981 die(_("helper %s does not support --signed"), name);
982 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
983 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
984 die(_("helper %s does not support --signed=if-asked"), name);
985 }
986
987 if (flags & TRANSPORT_PUSH_ATOMIC)
988 if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0)
989 die(_("helper %s does not support --atomic"), name);
990
991 if (flags & TRANSPORT_PUSH_FORCE_IF_INCLUDES)
992 if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
993 die(_("helper %s does not support --%s"),
994 name, TRANS_OPT_FORCE_IF_INCLUDES);
995
996 if (flags & TRANSPORT_PUSH_OPTIONS) {
997 struct string_list_item *item;
998 for_each_string_list_item(item, transport->push_options)
999 if (set_helper_option(transport, "push-option", item->string) != 0)
1000 die(_("helper %s does not support 'push-option'"), name);
1001 }
1002 }
1003
1004 static int push_refs_with_push(struct transport *transport,
1005 struct ref *remote_refs, int flags)
1006 {
1007 int force_all = flags & TRANSPORT_PUSH_FORCE;
1008 int mirror = flags & TRANSPORT_PUSH_MIRROR;
1009 int atomic = flags & TRANSPORT_PUSH_ATOMIC;
1010 struct helper_data *data = transport->data;
1011 struct strbuf buf = STRBUF_INIT;
1012 struct ref *ref;
1013 struct string_list cas_options = STRING_LIST_INIT_DUP;
1014 struct string_list_item *cas_option;
1015
1016 get_helper(transport);
1017 if (!data->push)
1018 return 1;
1019
1020 for (ref = remote_refs; ref; ref = ref->next) {
1021 if (!ref->peer_ref && !mirror)
1022 continue;
1023
1024 /* Check for statuses set by set_ref_status_for_push() */
1025 switch (ref->status) {
1026 case REF_STATUS_REJECT_NONFASTFORWARD:
1027 case REF_STATUS_REJECT_STALE:
1028 case REF_STATUS_REJECT_ALREADY_EXISTS:
1029 case REF_STATUS_REJECT_REMOTE_UPDATED:
1030 if (atomic) {
1031 reject_atomic_push(remote_refs, mirror);
1032 string_list_clear(&cas_options, 0);
1033 strbuf_release(&buf);
1034 return 0;
1035 } else
1036 continue;
1037 case REF_STATUS_UPTODATE:
1038 continue;
1039 default:
1040 ; /* do nothing */
1041 }
1042
1043 if (force_all)
1044 ref->force = 1;
1045
1046 strbuf_addstr(&buf, "push ");
1047 if (!ref->deletion) {
1048 if (ref->force)
1049 strbuf_addch(&buf, '+');
1050 if (ref->peer_ref)
1051 strbuf_addstr(&buf, ref->peer_ref->name);
1052 else
1053 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
1054 }
1055 strbuf_addch(&buf, ':');
1056 strbuf_addstr(&buf, ref->name);
1057 strbuf_addch(&buf, '\n');
1058
1059 /*
1060 * The "--force-with-lease" options without explicit
1061 * values to expect have already been expanded into
1062 * the ref->old_oid_expect[] field; we can ignore
1063 * transport->smart_options->cas altogether and instead
1064 * can enumerate them from the refs.
1065 */
1066 if (ref->expect_old_sha1) {
1067 struct strbuf cas = STRBUF_INIT;
1068 strbuf_addf(&cas, "%s:%s",
1069 ref->name, oid_to_hex(&ref->old_oid_expect));
1070 string_list_append_nodup(&cas_options,
1071 strbuf_detach(&cas, NULL));
1072 }
1073 }
1074 if (buf.len == 0) {
1075 string_list_clear(&cas_options, 0);
1076 return 0;
1077 }
1078
1079 for_each_string_list_item(cas_option, &cas_options)
1080 set_helper_option(transport, "cas", cas_option->string);
1081 set_common_push_options(transport, data->name, flags);
1082
1083 strbuf_addch(&buf, '\n');
1084 sendline(data, &buf);
1085 strbuf_release(&buf);
1086 string_list_clear(&cas_options, 0);
1087
1088 return push_update_refs_status(data, remote_refs, flags);
1089 }
1090
1091 static int push_refs_with_export(struct transport *transport,
1092 struct ref *remote_refs, int flags)
1093 {
1094 struct ref *ref;
1095 struct child_process *helper, exporter;
1096 struct helper_data *data = transport->data;
1097 struct string_list revlist_args = STRING_LIST_INIT_DUP;
1098 struct strbuf buf = STRBUF_INIT;
1099
1100 if (!data->rs.nr)
1101 die(_("remote-helper doesn't support push; refspec needed"));
1102
1103 set_common_push_options(transport, data->name, flags);
1104 if (flags & TRANSPORT_PUSH_FORCE) {
1105 if (set_helper_option(transport, "force", "true") != 0)
1106 warning(_("helper %s does not support '--force'"), data->name);
1107 }
1108
1109 helper = get_helper(transport);
1110
1111 write_constant(helper->in, "export\n");
1112
1113 for (ref = remote_refs; ref; ref = ref->next) {
1114 char *private;
1115 struct object_id oid;
1116
1117 private = apply_refspecs(&data->rs, ref->name);
1118 if (private && !repo_get_oid(the_repository, private, &oid)) {
1119 strbuf_addf(&buf, "^%s", private);
1120 string_list_append_nodup(&revlist_args,
1121 strbuf_detach(&buf, NULL));
1122 oidcpy(&ref->old_oid, &oid);
1123 }
1124 free(private);
1125
1126 if (ref->peer_ref) {
1127 if (strcmp(ref->name, ref->peer_ref->name)) {
1128 if (!ref->deletion) {
1129 const char *name;
1130 int flag;
1131
1132 /* Follow symbolic refs (mainly for HEAD). */
1133 name = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1134 ref->peer_ref->name,
1135 RESOLVE_REF_READING,
1136 &oid,
1137 &flag);
1138 if (!name || !(flag & REF_ISSYMREF))
1139 name = ref->peer_ref->name;
1140
1141 strbuf_addf(&buf, "%s:%s", name, ref->name);
1142 } else
1143 strbuf_addf(&buf, ":%s", ref->name);
1144
1145 string_list_append(&revlist_args, "--refspec");
1146 string_list_append(&revlist_args, buf.buf);
1147 strbuf_release(&buf);
1148 }
1149 if (!ref->deletion)
1150 string_list_append(&revlist_args, ref->peer_ref->name);
1151 }
1152 }
1153
1154 if (get_exporter(transport, &exporter, &revlist_args))
1155 die(_("couldn't run fast-export"));
1156
1157 string_list_clear(&revlist_args, 1);
1158
1159 if (finish_command(&exporter))
1160 die(_("error while running fast-export"));
1161 if (push_update_refs_status(data, remote_refs, flags))
1162 return 1;
1163
1164 if (data->export_marks) {
1165 strbuf_addf(&buf, "%s.tmp", data->export_marks);
1166 rename(buf.buf, data->export_marks);
1167 strbuf_release(&buf);
1168 }
1169
1170 return 0;
1171 }
1172
1173 static int push_refs(struct transport *transport,
1174 struct ref *remote_refs, int flags)
1175 {
1176 struct helper_data *data = transport->data;
1177
1178 if (process_connect(transport, 1))
1179 return transport->vtable->push_refs(transport, remote_refs, flags);
1180
1181 if (!remote_refs) {
1182 fprintf(stderr,
1183 _("No refs in common and none specified; doing nothing.\n"
1184 "Perhaps you should specify a branch.\n"));
1185 return 0;
1186 }
1187
1188 if (data->push)
1189 return push_refs_with_push(transport, remote_refs, flags);
1190
1191 if (data->export)
1192 return push_refs_with_export(transport, remote_refs, flags);
1193
1194 return -1;
1195 }
1196
1197
1198 static int has_attribute(const char *attrs, const char *attr)
1199 {
1200 int len;
1201 if (!attrs)
1202 return 0;
1203
1204 len = strlen(attr);
1205 for (;;) {
1206 const char *space = strchrnul(attrs, ' ');
1207 if (len == space - attrs && !strncmp(attrs, attr, len))
1208 return 1;
1209 if (!*space)
1210 return 0;
1211 attrs = space + 1;
1212 }
1213 }
1214
1215 static struct ref *get_refs_list(struct transport *transport, int for_push,
1216 struct transport_ls_refs_options *transport_options)
1217 {
1218 get_helper(transport);
1219
1220 if (process_connect(transport, for_push))
1221 return transport->vtable->get_refs_list(transport, for_push,
1222 transport_options);
1223
1224 return get_refs_list_using_list(transport, for_push);
1225 }
1226
1227 static struct ref *get_refs_list_using_list(struct transport *transport,
1228 int for_push)
1229 {
1230 struct helper_data *data = transport->data;
1231 struct child_process *helper;
1232 struct ref *ret = NULL;
1233 struct ref **tail = &ret;
1234 struct ref *posn;
1235 struct strbuf buf = STRBUF_INIT;
1236
1237 data->get_refs_list_called = 1;
1238 helper = get_helper(transport);
1239
1240 if (data->object_format)
1241 set_helper_option(transport, "object-format", "true");
1242
1243 if (data->push && for_push)
1244 write_constant(helper->in, "list for-push\n");
1245 else
1246 write_constant(helper->in, "list\n");
1247
1248 while (1) {
1249 char *eov, *eon;
1250 if (recvline(data, &buf))
1251 exit(128);
1252
1253 if (!*buf.buf)
1254 break;
1255 else if (buf.buf[0] == ':') {
1256 const char *value;
1257 if (skip_prefix(buf.buf, ":object-format ", &value)) {
1258 int algo = hash_algo_by_name(value);
1259 if (algo == GIT_HASH_UNKNOWN)
1260 die(_("unsupported object format '%s'"),
1261 value);
1262 transport->hash_algo = &hash_algos[algo];
1263 }
1264 continue;
1265 }
1266
1267 eov = strchr(buf.buf, ' ');
1268 if (!eov)
1269 die(_("malformed response in ref list: %s"), buf.buf);
1270 eon = strchr(eov + 1, ' ');
1271 *eov = '\0';
1272 if (eon)
1273 *eon = '\0';
1274 *tail = alloc_ref(eov + 1);
1275 if (buf.buf[0] == '@')
1276 (*tail)->symref = xstrdup(buf.buf + 1);
1277 else if (buf.buf[0] != '?')
1278 get_oid_hex_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo);
1279 if (eon) {
1280 if (has_attribute(eon + 1, "unchanged")) {
1281 (*tail)->status |= REF_STATUS_UPTODATE;
1282 if (refs_read_ref(get_main_ref_store(the_repository), (*tail)->name, &(*tail)->old_oid) < 0)
1283 die(_("could not read ref %s"),
1284 (*tail)->name);
1285 }
1286 }
1287 tail = &((*tail)->next);
1288 }
1289 if (debug)
1290 fprintf(stderr, "Debug: Read ref listing.\n");
1291 strbuf_release(&buf);
1292
1293 for (posn = ret; posn; posn = posn->next)
1294 resolve_remote_symref(posn, ret);
1295
1296 return ret;
1297 }
1298
1299 static int get_bundle_uri(struct transport *transport)
1300 {
1301 get_helper(transport);
1302
1303 if (process_connect(transport, 0))
1304 return transport->vtable->get_bundle_uri(transport);
1305
1306 return -1;
1307 }
1308
1309 static struct transport_vtable vtable = {
1310 .set_option = set_helper_option,
1311 .get_refs_list = get_refs_list,
1312 .get_bundle_uri = get_bundle_uri,
1313 .fetch_refs = fetch_refs,
1314 .push_refs = push_refs,
1315 .connect = connect_helper,
1316 .disconnect = release_helper
1317 };
1318
1319 int transport_helper_init(struct transport *transport, const char *name)
1320 {
1321 struct helper_data *data = xcalloc(1, sizeof(*data));
1322 data->name = xstrdup(name);
1323
1324 transport_check_allowed(name);
1325
1326 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1327 debug = 1;
1328
1329 list_objects_filter_init(&data->transport_options.filter_options);
1330
1331 transport->data = data;
1332 transport->vtable = &vtable;
1333 transport->smart_options = &(data->transport_options);
1334 return 0;
1335 }
1336
1337 /*
1338 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1339 * buffer less), so attempt reads and writes with up to that size.
1340 */
1341 #define BUFFERSIZE 65536
1342 /* This should be enough to hold debugging message. */
1343 #define PBUFFERSIZE 8192
1344
1345 /* Print bidirectional transfer loop debug message. */
1346 __attribute__((format (printf, 1, 2)))
1347 static void transfer_debug(const char *fmt, ...)
1348 {
1349 /*
1350 * NEEDSWORK: This function is sometimes used from multiple threads, and
1351 * we end up using debug_enabled racily. That "should not matter" since
1352 * we always write the same value, but it's still wrong. This function
1353 * is listed in .tsan-suppressions for the time being.
1354 */
1355
1356 va_list args;
1357 char msgbuf[PBUFFERSIZE];
1358 static int debug_enabled = -1;
1359
1360 if (debug_enabled < 0)
1361 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1362 if (!debug_enabled)
1363 return;
1364
1365 va_start(args, fmt);
1366 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1367 va_end(args);
1368 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1369 }
1370
1371 /* Stream state: More data may be coming in this direction. */
1372 #define SSTATE_TRANSFERRING 0
1373 /*
1374 * Stream state: No more data coming in this direction, flushing rest of
1375 * data.
1376 */
1377 #define SSTATE_FLUSHING 1
1378 /* Stream state: Transfer in this direction finished. */
1379 #define SSTATE_FINISHED 2
1380
1381 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1382 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1383 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1384
1385 /* Unidirectional transfer. */
1386 struct unidirectional_transfer {
1387 /* Source */
1388 int src;
1389 /* Destination */
1390 int dest;
1391 /* Is source socket? */
1392 int src_is_sock;
1393 /* Is destination socket? */
1394 int dest_is_sock;
1395 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1396 int state;
1397 /* Buffer. */
1398 char buf[BUFFERSIZE];
1399 /* Buffer used. */
1400 size_t bufuse;
1401 /* Name of source. */
1402 const char *src_name;
1403 /* Name of destination. */
1404 const char *dest_name;
1405 };
1406
1407 /* Closes the target (for writing) if transfer has finished. */
1408 static void udt_close_if_finished(struct unidirectional_transfer *t)
1409 {
1410 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1411 t->state = SSTATE_FINISHED;
1412 if (t->dest_is_sock)
1413 shutdown(t->dest, SHUT_WR);
1414 else
1415 close(t->dest);
1416 transfer_debug("Closed %s.", t->dest_name);
1417 }
1418 }
1419
1420 /*
1421 * Tries to read data from source into buffer. If buffer is full,
1422 * no data is read. Returns 0 on success, -1 on error.
1423 */
1424 static int udt_do_read(struct unidirectional_transfer *t)
1425 {
1426 ssize_t bytes;
1427
1428 if (t->bufuse == BUFFERSIZE)
1429 return 0; /* No space for more. */
1430
1431 transfer_debug("%s is readable", t->src_name);
1432 bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1433 if (bytes < 0) {
1434 error_errno(_("read(%s) failed"), t->src_name);
1435 return -1;
1436 } else if (bytes == 0) {
1437 transfer_debug("%s EOF (with %i bytes in buffer)",
1438 t->src_name, (int)t->bufuse);
1439 t->state = SSTATE_FLUSHING;
1440 } else {
1441 t->bufuse += bytes;
1442 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1443 (int)bytes, t->src_name, (int)t->bufuse);
1444 }
1445 return 0;
1446 }
1447
1448 /* Tries to write data from buffer into destination. If buffer is empty,
1449 * no data is written. Returns 0 on success, -1 on error.
1450 */
1451 static int udt_do_write(struct unidirectional_transfer *t)
1452 {
1453 ssize_t bytes;
1454
1455 if (t->bufuse == 0)
1456 return 0; /* Nothing to write. */
1457
1458 transfer_debug("%s is writable", t->dest_name);
1459 bytes = xwrite(t->dest, t->buf, t->bufuse);
1460 if (bytes < 0) {
1461 error_errno(_("write(%s) failed"), t->dest_name);
1462 return -1;
1463 } else if (bytes > 0) {
1464 t->bufuse -= bytes;
1465 if (t->bufuse)
1466 memmove(t->buf, t->buf + bytes, t->bufuse);
1467 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1468 (int)bytes, t->dest_name, (int)t->bufuse);
1469 }
1470 return 0;
1471 }
1472
1473
1474 /* State of bidirectional transfer loop. */
1475 struct bidirectional_transfer_state {
1476 /* Direction from program to git. */
1477 struct unidirectional_transfer ptg;
1478 /* Direction from git to program. */
1479 struct unidirectional_transfer gtp;
1480 };
1481
1482 static void *udt_copy_task_routine(void *udt)
1483 {
1484 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1485 while (t->state != SSTATE_FINISHED) {
1486 if (STATE_NEEDS_READING(t->state))
1487 if (udt_do_read(t))
1488 return NULL;
1489 if (STATE_NEEDS_WRITING(t->state))
1490 if (udt_do_write(t))
1491 return NULL;
1492 if (STATE_NEEDS_CLOSING(t->state))
1493 udt_close_if_finished(t);
1494 }
1495 return udt; /* Just some non-NULL value. */
1496 }
1497
1498 #ifndef NO_PTHREADS
1499
1500 /*
1501 * Join thread, with appropriate errors on failure. Name is name for the
1502 * thread (for error messages). Returns 0 on success, 1 on failure.
1503 */
1504 static int tloop_join(pthread_t thread, const char *name)
1505 {
1506 int err;
1507 void *tret;
1508 err = pthread_join(thread, &tret);
1509 if (!tret) {
1510 error(_("%s thread failed"), name);
1511 return 1;
1512 }
1513 if (err) {
1514 error(_("%s thread failed to join: %s"), name, strerror(err));
1515 return 1;
1516 }
1517 return 0;
1518 }
1519
1520 /*
1521 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1522 * -1 on failure.
1523 */
1524 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1525 {
1526 pthread_t gtp_thread;
1527 pthread_t ptg_thread;
1528 int err;
1529 int ret = 0;
1530 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1531 &s->gtp);
1532 if (err)
1533 die(_("can't start thread for copying data: %s"), strerror(err));
1534 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1535 &s->ptg);
1536 if (err)
1537 die(_("can't start thread for copying data: %s"), strerror(err));
1538
1539 ret |= tloop_join(gtp_thread, "Git to program copy");
1540 ret |= tloop_join(ptg_thread, "Program to git copy");
1541 return ret;
1542 }
1543 #else
1544
1545 /* Close the source and target (for writing) for transfer. */
1546 static void udt_kill_transfer(struct unidirectional_transfer *t)
1547 {
1548 t->state = SSTATE_FINISHED;
1549 /*
1550 * Socket read end left open isn't a disaster if nobody
1551 * attempts to read from it (mingw compat headers do not
1552 * have SHUT_RD)...
1553 *
1554 * We can't fully close the socket since otherwise gtp
1555 * task would first close the socket it sends data to
1556 * while closing the ptg file descriptors.
1557 */
1558 if (!t->src_is_sock)
1559 close(t->src);
1560 if (t->dest_is_sock)
1561 shutdown(t->dest, SHUT_WR);
1562 else
1563 close(t->dest);
1564 }
1565
1566 /*
1567 * Join process, with appropriate errors on failure. Name is name for the
1568 * process (for error messages). Returns 0 on success, 1 on failure.
1569 */
1570 static int tloop_join(pid_t pid, const char *name)
1571 {
1572 int tret;
1573 if (waitpid(pid, &tret, 0) < 0) {
1574 error_errno(_("%s process failed to wait"), name);
1575 return 1;
1576 }
1577 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1578 error(_("%s process failed"), name);
1579 return 1;
1580 }
1581 return 0;
1582 }
1583
1584 /*
1585 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1586 * -1 on failure.
1587 */
1588 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1589 {
1590 pid_t pid1, pid2;
1591 int ret = 0;
1592
1593 /* Fork thread #1: git to program. */
1594 pid1 = fork();
1595 if (pid1 < 0)
1596 die_errno(_("can't start thread for copying data"));
1597 else if (pid1 == 0) {
1598 udt_kill_transfer(&s->ptg);
1599 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1600 }
1601
1602 /* Fork thread #2: program to git. */
1603 pid2 = fork();
1604 if (pid2 < 0)
1605 die_errno(_("can't start thread for copying data"));
1606 else if (pid2 == 0) {
1607 udt_kill_transfer(&s->gtp);
1608 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1609 }
1610
1611 /*
1612 * Close both streams in parent as to not interfere with
1613 * end of file detection and wait for both tasks to finish.
1614 */
1615 udt_kill_transfer(&s->gtp);
1616 udt_kill_transfer(&s->ptg);
1617 ret |= tloop_join(pid1, "Git to program copy");
1618 ret |= tloop_join(pid2, "Program to git copy");
1619 return ret;
1620 }
1621 #endif
1622
1623 /*
1624 * Copies data from stdin to output and from input to stdout simultaneously.
1625 * Additionally filtering through given filter. If filter is NULL, uses
1626 * identity filter.
1627 */
1628 int bidirectional_transfer_loop(int input, int output)
1629 {
1630 struct bidirectional_transfer_state state;
1631
1632 /* Fill the state fields. */
1633 state.ptg.src = input;
1634 state.ptg.dest = 1;
1635 state.ptg.src_is_sock = (input == output);
1636 state.ptg.dest_is_sock = 0;
1637 state.ptg.state = SSTATE_TRANSFERRING;
1638 state.ptg.bufuse = 0;
1639 state.ptg.src_name = "remote input";
1640 state.ptg.dest_name = "stdout";
1641
1642 state.gtp.src = 0;
1643 state.gtp.dest = output;
1644 state.gtp.src_is_sock = 0;
1645 state.gtp.dest_is_sock = (input == output);
1646 state.gtp.state = SSTATE_TRANSFERRING;
1647 state.gtp.bufuse = 0;
1648 state.gtp.src_name = "stdin";
1649 state.gtp.dest_name = "remote output";
1650
1651 return tloop_spawnwait_tasks(&state);
1652 }
1653
1654 void reject_atomic_push(struct ref *remote_refs, int mirror_mode)
1655 {
1656 struct ref *ref;
1657
1658 /* Mark other refs as failed */
1659 for (ref = remote_refs; ref; ref = ref->next) {
1660 if (!ref->peer_ref && !mirror_mode)
1661 continue;
1662
1663 switch (ref->status) {
1664 case REF_STATUS_NONE:
1665 case REF_STATUS_OK:
1666 case REF_STATUS_EXPECTING_REPORT:
1667 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
1668 continue;
1669 default:
1670 break; /* do nothing */
1671 }
1672 }
1673 return;
1674 }
Mirror of Junio's Git repository with all the branches