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