git-completion.bash: add branch.*.pushremote to config list
[git.git] / transport-helper.c
blob5f8d075ed8c18b198e956bf10d6647598f565597
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 "quote.h"
9 #include "remote.h"
10 #include "string-list.h"
11 #include "thread-utils.h"
12 #include "sigchain.h"
13 #include "argv-array.h"
15 static int debug;
17 struct helper_data {
18 const char *name;
19 struct child_process *helper;
20 FILE *out;
21 unsigned fetch : 1,
22 import : 1,
23 bidi_import : 1,
24 export : 1,
25 option : 1,
26 push : 1,
27 connect : 1,
28 signed_tags : 1,
29 no_disconnect_req : 1;
30 char *export_marks;
31 char *import_marks;
32 /* These go from remote name (as in "list") to private name */
33 struct refspec *refspecs;
34 int refspec_nr;
35 /* Transport options for fetch-pack/send-pack (should one of
36 * those be invoked).
38 struct git_transport_options transport_options;
41 static void sendline(struct helper_data *helper, struct strbuf *buffer)
43 if (debug)
44 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
45 if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
46 != buffer->len)
47 die_errno("Full write to remote helper failed");
50 static int recvline_fh(FILE *helper, struct strbuf *buffer)
52 strbuf_reset(buffer);
53 if (debug)
54 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
55 if (strbuf_getline(buffer, helper, '\n') == EOF) {
56 if (debug)
57 fprintf(stderr, "Debug: Remote helper quit.\n");
58 exit(128);
61 if (debug)
62 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
63 return 0;
66 static int recvline(struct helper_data *helper, struct strbuf *buffer)
68 return recvline_fh(helper->out, buffer);
71 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
73 sendline(helper, buffer);
74 recvline(helper, buffer);
77 static void write_constant(int fd, const char *str)
79 if (debug)
80 fprintf(stderr, "Debug: Remote helper: -> %s", str);
81 if (write_in_full(fd, str, strlen(str)) != strlen(str))
82 die_errno("Full write to remote helper failed");
85 static const char *remove_ext_force(const char *url)
87 if (url) {
88 const char *colon = strchr(url, ':');
89 if (colon && colon[1] == ':')
90 return colon + 2;
92 return url;
95 static void do_take_over(struct transport *transport)
97 struct helper_data *data;
98 data = (struct helper_data *)transport->data;
99 transport_take_over(transport, data->helper);
100 fclose(data->out);
101 free(data);
104 static struct child_process *get_helper(struct transport *transport)
106 struct helper_data *data = transport->data;
107 struct argv_array argv = ARGV_ARRAY_INIT;
108 struct strbuf buf = STRBUF_INIT;
109 struct child_process *helper;
110 const char **refspecs = NULL;
111 int refspec_nr = 0;
112 int refspec_alloc = 0;
113 int duped;
114 int code;
115 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
116 const char *helper_env[] = {
117 git_dir_buf,
118 NULL
122 if (data->helper)
123 return data->helper;
125 helper = xcalloc(1, sizeof(*helper));
126 helper->in = -1;
127 helper->out = -1;
128 helper->err = 0;
129 argv_array_pushf(&argv, "git-remote-%s", data->name);
130 argv_array_push(&argv, transport->remote->name);
131 argv_array_push(&argv, remove_ext_force(transport->url));
132 helper->argv = argv_array_detach(&argv, NULL);
133 helper->git_cmd = 0;
134 helper->silent_exec_failure = 1;
136 snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
137 helper->env = helper_env;
139 code = start_command(helper);
140 if (code < 0 && errno == ENOENT)
141 die("Unable to find remote helper for '%s'", data->name);
142 else if (code != 0)
143 exit(code);
145 data->helper = helper;
146 data->no_disconnect_req = 0;
149 * Open the output as FILE* so strbuf_getline() can be used.
150 * Do this with duped fd because fclose() will close the fd,
151 * and stuff like taking over will require the fd to remain.
153 duped = dup(helper->out);
154 if (duped < 0)
155 die_errno("Can't dup helper output fd");
156 data->out = xfdopen(duped, "r");
158 write_constant(helper->in, "capabilities\n");
160 while (1) {
161 const char *capname;
162 int mandatory = 0;
163 recvline(data, &buf);
165 if (!*buf.buf)
166 break;
168 if (*buf.buf == '*') {
169 capname = buf.buf + 1;
170 mandatory = 1;
171 } else
172 capname = buf.buf;
174 if (debug)
175 fprintf(stderr, "Debug: Got cap %s\n", capname);
176 if (!strcmp(capname, "fetch"))
177 data->fetch = 1;
178 else if (!strcmp(capname, "option"))
179 data->option = 1;
180 else if (!strcmp(capname, "push"))
181 data->push = 1;
182 else if (!strcmp(capname, "import"))
183 data->import = 1;
184 else if (!strcmp(capname, "bidi-import"))
185 data->bidi_import = 1;
186 else if (!strcmp(capname, "export"))
187 data->export = 1;
188 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
189 ALLOC_GROW(refspecs,
190 refspec_nr + 1,
191 refspec_alloc);
192 refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec "));
193 } else if (!strcmp(capname, "connect")) {
194 data->connect = 1;
195 } else if (!strcmp(capname, "signed-tags")) {
196 data->signed_tags = 1;
197 } else if (!prefixcmp(capname, "export-marks ")) {
198 struct strbuf arg = STRBUF_INIT;
199 strbuf_addstr(&arg, "--export-marks=");
200 strbuf_addstr(&arg, capname + strlen("export-marks "));
201 data->export_marks = strbuf_detach(&arg, NULL);
202 } else if (!prefixcmp(capname, "import-marks")) {
203 struct strbuf arg = STRBUF_INIT;
204 strbuf_addstr(&arg, "--import-marks=");
205 strbuf_addstr(&arg, capname + strlen("import-marks "));
206 data->import_marks = strbuf_detach(&arg, NULL);
207 } else if (mandatory) {
208 die("Unknown mandatory capability %s. This remote "
209 "helper probably needs newer version of Git.",
210 capname);
213 if (refspecs) {
214 int i;
215 data->refspec_nr = refspec_nr;
216 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
217 for (i = 0; i < refspec_nr; i++) {
218 free((char *)refspecs[i]);
220 free(refspecs);
222 strbuf_release(&buf);
223 if (debug)
224 fprintf(stderr, "Debug: Capabilities complete.\n");
225 return data->helper;
228 static int disconnect_helper(struct transport *transport)
230 struct helper_data *data = transport->data;
231 int res = 0;
233 if (data->helper) {
234 if (debug)
235 fprintf(stderr, "Debug: Disconnecting.\n");
236 if (!data->no_disconnect_req) {
238 * Ignore write errors; there's nothing we can do,
239 * since we're about to close the pipe anyway. And the
240 * most likely error is EPIPE due to the helper dying
241 * to report an error itself.
243 sigchain_push(SIGPIPE, SIG_IGN);
244 xwrite(data->helper->in, "\n", 1);
245 sigchain_pop(SIGPIPE);
247 close(data->helper->in);
248 close(data->helper->out);
249 fclose(data->out);
250 res = finish_command(data->helper);
251 argv_array_free_detached(data->helper->argv);
252 free(data->helper);
253 data->helper = NULL;
255 return res;
258 static const char *unsupported_options[] = {
259 TRANS_OPT_UPLOADPACK,
260 TRANS_OPT_RECEIVEPACK,
261 TRANS_OPT_THIN,
262 TRANS_OPT_KEEP
264 static const char *boolean_options[] = {
265 TRANS_OPT_THIN,
266 TRANS_OPT_KEEP,
267 TRANS_OPT_FOLLOWTAGS
270 static int set_helper_option(struct transport *transport,
271 const char *name, const char *value)
273 struct helper_data *data = transport->data;
274 struct strbuf buf = STRBUF_INIT;
275 int i, ret, is_bool = 0;
277 get_helper(transport);
279 if (!data->option)
280 return 1;
282 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
283 if (!strcmp(name, unsupported_options[i]))
284 return 1;
287 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
288 if (!strcmp(name, boolean_options[i])) {
289 is_bool = 1;
290 break;
294 strbuf_addf(&buf, "option %s ", name);
295 if (is_bool)
296 strbuf_addstr(&buf, value ? "true" : "false");
297 else
298 quote_c_style(value, &buf, NULL, 0);
299 strbuf_addch(&buf, '\n');
301 xchgline(data, &buf);
303 if (!strcmp(buf.buf, "ok"))
304 ret = 0;
305 else if (!prefixcmp(buf.buf, "error")) {
306 ret = -1;
307 } else if (!strcmp(buf.buf, "unsupported"))
308 ret = 1;
309 else {
310 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
311 ret = 1;
313 strbuf_release(&buf);
314 return ret;
317 static void standard_options(struct transport *t)
319 char buf[16];
320 int n;
321 int v = t->verbose;
323 set_helper_option(t, "progress", t->progress ? "true" : "false");
325 n = snprintf(buf, sizeof(buf), "%d", v + 1);
326 if (n >= sizeof(buf))
327 die("impossibly large verbosity value");
328 set_helper_option(t, "verbosity", buf);
331 static int release_helper(struct transport *transport)
333 int res = 0;
334 struct helper_data *data = transport->data;
335 free_refspec(data->refspec_nr, data->refspecs);
336 data->refspecs = NULL;
337 res = disconnect_helper(transport);
338 free(transport->data);
339 return res;
342 static int fetch_with_fetch(struct transport *transport,
343 int nr_heads, struct ref **to_fetch)
345 struct helper_data *data = transport->data;
346 int i;
347 struct strbuf buf = STRBUF_INIT;
349 standard_options(transport);
351 for (i = 0; i < nr_heads; i++) {
352 const struct ref *posn = to_fetch[i];
353 if (posn->status & REF_STATUS_UPTODATE)
354 continue;
356 strbuf_addf(&buf, "fetch %s %s\n",
357 sha1_to_hex(posn->old_sha1), posn->name);
360 strbuf_addch(&buf, '\n');
361 sendline(data, &buf);
363 while (1) {
364 recvline(data, &buf);
366 if (!prefixcmp(buf.buf, "lock ")) {
367 const char *name = buf.buf + 5;
368 if (transport->pack_lockfile)
369 warning("%s also locked %s", data->name, name);
370 else
371 transport->pack_lockfile = xstrdup(name);
373 else if (!buf.len)
374 break;
375 else
376 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
378 strbuf_release(&buf);
379 return 0;
382 static int get_importer(struct transport *transport, struct child_process *fastimport)
384 struct child_process *helper = get_helper(transport);
385 struct helper_data *data = transport->data;
386 struct argv_array argv = ARGV_ARRAY_INIT;
387 int cat_blob_fd, code;
388 memset(fastimport, 0, sizeof(*fastimport));
389 fastimport->in = helper->out;
390 argv_array_push(&argv, "fast-import");
391 argv_array_push(&argv, debug ? "--stats" : "--quiet");
393 if (data->bidi_import) {
394 cat_blob_fd = xdup(helper->in);
395 argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
397 fastimport->argv = argv.argv;
398 fastimport->git_cmd = 1;
400 code = start_command(fastimport);
401 return code;
404 static int get_exporter(struct transport *transport,
405 struct child_process *fastexport,
406 struct string_list *revlist_args)
408 struct helper_data *data = transport->data;
409 struct child_process *helper = get_helper(transport);
410 int argc = 0, i;
411 memset(fastexport, 0, sizeof(*fastexport));
413 /* we need to duplicate helper->in because we want to use it after
414 * fastexport is done with it. */
415 fastexport->out = dup(helper->in);
416 fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
417 fastexport->argv[argc++] = "fast-export";
418 fastexport->argv[argc++] = "--use-done-feature";
419 fastexport->argv[argc++] = data->signed_tags ?
420 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
421 if (data->export_marks)
422 fastexport->argv[argc++] = data->export_marks;
423 if (data->import_marks)
424 fastexport->argv[argc++] = data->import_marks;
426 for (i = 0; i < revlist_args->nr; i++)
427 fastexport->argv[argc++] = revlist_args->items[i].string;
429 fastexport->git_cmd = 1;
430 return start_command(fastexport);
433 static int fetch_with_import(struct transport *transport,
434 int nr_heads, struct ref **to_fetch)
436 struct child_process fastimport;
437 struct helper_data *data = transport->data;
438 int i;
439 struct ref *posn;
440 struct strbuf buf = STRBUF_INIT;
442 get_helper(transport);
444 if (get_importer(transport, &fastimport))
445 die("Couldn't run fast-import");
447 for (i = 0; i < nr_heads; i++) {
448 posn = to_fetch[i];
449 if (posn->status & REF_STATUS_UPTODATE)
450 continue;
452 strbuf_addf(&buf, "import %s\n", posn->name);
453 sendline(data, &buf);
454 strbuf_reset(&buf);
457 write_constant(data->helper->in, "\n");
459 * remote-helpers that advertise the bidi-import capability are required to
460 * buffer the complete batch of import commands until this newline before
461 * sending data to fast-import.
462 * These helpers read back data from fast-import on their stdin, which could
463 * be mixed with import commands, otherwise.
466 if (finish_command(&fastimport))
467 die("Error while running fast-import");
468 argv_array_free_detached(fastimport.argv);
471 * The fast-import stream of a remote helper that advertises
472 * the "refspec" capability writes to the refs named after the
473 * right hand side of the first refspec matching each ref we
474 * were fetching.
476 * (If no "refspec" capability was specified, for historical
477 * reasons we default to *:*.)
479 * Store the result in to_fetch[i].old_sha1. Callers such
480 * as "git fetch" can use the value to write feedback to the
481 * terminal, populate FETCH_HEAD, and determine what new value
482 * should be written to peer_ref if the update is a
483 * fast-forward or this is a forced update.
485 for (i = 0; i < nr_heads; i++) {
486 char *private;
487 posn = to_fetch[i];
488 if (posn->status & REF_STATUS_UPTODATE)
489 continue;
490 if (data->refspecs)
491 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
492 else
493 private = xstrdup(posn->name);
494 if (private) {
495 read_ref(private, posn->old_sha1);
496 free(private);
499 strbuf_release(&buf);
500 return 0;
503 static int process_connect_service(struct transport *transport,
504 const char *name, const char *exec)
506 struct helper_data *data = transport->data;
507 struct strbuf cmdbuf = STRBUF_INIT;
508 struct child_process *helper;
509 int r, duped, ret = 0;
510 FILE *input;
512 helper = get_helper(transport);
515 * Yes, dup the pipe another time, as we need unbuffered version
516 * of input pipe as FILE*. fclose() closes the underlying fd and
517 * stream buffering only can be changed before first I/O operation
518 * on it.
520 duped = dup(helper->out);
521 if (duped < 0)
522 die_errno("Can't dup helper output fd");
523 input = xfdopen(duped, "r");
524 setvbuf(input, NULL, _IONBF, 0);
527 * Handle --upload-pack and friends. This is fire and forget...
528 * just warn if it fails.
530 if (strcmp(name, exec)) {
531 r = set_helper_option(transport, "servpath", exec);
532 if (r > 0)
533 warning("Setting remote service path not supported by protocol.");
534 else if (r < 0)
535 warning("Invalid remote service path.");
538 if (data->connect)
539 strbuf_addf(&cmdbuf, "connect %s\n", name);
540 else
541 goto exit;
543 sendline(data, &cmdbuf);
544 recvline_fh(input, &cmdbuf);
545 if (!strcmp(cmdbuf.buf, "")) {
546 data->no_disconnect_req = 1;
547 if (debug)
548 fprintf(stderr, "Debug: Smart transport connection "
549 "ready.\n");
550 ret = 1;
551 } else if (!strcmp(cmdbuf.buf, "fallback")) {
552 if (debug)
553 fprintf(stderr, "Debug: Falling back to dumb "
554 "transport.\n");
555 } else
556 die("Unknown response to connect: %s",
557 cmdbuf.buf);
559 exit:
560 fclose(input);
561 return ret;
564 static int process_connect(struct transport *transport,
565 int for_push)
567 struct helper_data *data = transport->data;
568 const char *name;
569 const char *exec;
571 name = for_push ? "git-receive-pack" : "git-upload-pack";
572 if (for_push)
573 exec = data->transport_options.receivepack;
574 else
575 exec = data->transport_options.uploadpack;
577 return process_connect_service(transport, name, exec);
580 static int connect_helper(struct transport *transport, const char *name,
581 const char *exec, int fd[2])
583 struct helper_data *data = transport->data;
585 /* Get_helper so connect is inited. */
586 get_helper(transport);
587 if (!data->connect)
588 die("Operation not supported by protocol.");
590 if (!process_connect_service(transport, name, exec))
591 die("Can't connect to subservice %s.", name);
593 fd[0] = data->helper->out;
594 fd[1] = data->helper->in;
595 return 0;
598 static int fetch(struct transport *transport,
599 int nr_heads, struct ref **to_fetch)
601 struct helper_data *data = transport->data;
602 int i, count;
604 if (process_connect(transport, 0)) {
605 do_take_over(transport);
606 return transport->fetch(transport, nr_heads, to_fetch);
609 count = 0;
610 for (i = 0; i < nr_heads; i++)
611 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
612 count++;
614 if (!count)
615 return 0;
617 if (data->fetch)
618 return fetch_with_fetch(transport, nr_heads, to_fetch);
620 if (data->import)
621 return fetch_with_import(transport, nr_heads, to_fetch);
623 return -1;
626 static void push_update_ref_status(struct strbuf *buf,
627 struct ref **ref,
628 struct ref *remote_refs)
630 char *refname, *msg;
631 int status;
633 if (!prefixcmp(buf->buf, "ok ")) {
634 status = REF_STATUS_OK;
635 refname = buf->buf + 3;
636 } else if (!prefixcmp(buf->buf, "error ")) {
637 status = REF_STATUS_REMOTE_REJECT;
638 refname = buf->buf + 6;
639 } else
640 die("expected ok/error, helper said '%s'", buf->buf);
642 msg = strchr(refname, ' ');
643 if (msg) {
644 struct strbuf msg_buf = STRBUF_INIT;
645 const char *end;
647 *msg++ = '\0';
648 if (!unquote_c_style(&msg_buf, msg, &end))
649 msg = strbuf_detach(&msg_buf, NULL);
650 else
651 msg = xstrdup(msg);
652 strbuf_release(&msg_buf);
654 if (!strcmp(msg, "no match")) {
655 status = REF_STATUS_NONE;
656 free(msg);
657 msg = NULL;
659 else if (!strcmp(msg, "up to date")) {
660 status = REF_STATUS_UPTODATE;
661 free(msg);
662 msg = NULL;
664 else if (!strcmp(msg, "non-fast forward")) {
665 status = REF_STATUS_REJECT_NONFASTFORWARD;
666 free(msg);
667 msg = NULL;
669 else if (!strcmp(msg, "already exists")) {
670 status = REF_STATUS_REJECT_ALREADY_EXISTS;
671 free(msg);
672 msg = NULL;
674 else if (!strcmp(msg, "fetch first")) {
675 status = REF_STATUS_REJECT_FETCH_FIRST;
676 free(msg);
677 msg = NULL;
679 else if (!strcmp(msg, "needs force")) {
680 status = REF_STATUS_REJECT_NEEDS_FORCE;
681 free(msg);
682 msg = NULL;
686 if (*ref)
687 *ref = find_ref_by_name(*ref, refname);
688 if (!*ref)
689 *ref = find_ref_by_name(remote_refs, refname);
690 if (!*ref) {
691 warning("helper reported unexpected status of %s", refname);
692 return;
695 if ((*ref)->status != REF_STATUS_NONE) {
697 * Earlier, the ref was marked not to be pushed, so ignore the ref
698 * status reported by the remote helper if the latter is 'no match'.
700 if (status == REF_STATUS_NONE)
701 return;
704 (*ref)->status = status;
705 (*ref)->remote_status = msg;
708 static void push_update_refs_status(struct helper_data *data,
709 struct ref *remote_refs)
711 struct strbuf buf = STRBUF_INIT;
712 struct ref *ref = remote_refs;
713 for (;;) {
714 recvline(data, &buf);
715 if (!buf.len)
716 break;
718 push_update_ref_status(&buf, &ref, remote_refs);
720 strbuf_release(&buf);
723 static int push_refs_with_push(struct transport *transport,
724 struct ref *remote_refs, int flags)
726 int force_all = flags & TRANSPORT_PUSH_FORCE;
727 int mirror = flags & TRANSPORT_PUSH_MIRROR;
728 struct helper_data *data = transport->data;
729 struct strbuf buf = STRBUF_INIT;
730 struct ref *ref;
732 get_helper(transport);
733 if (!data->push)
734 return 1;
736 for (ref = remote_refs; ref; ref = ref->next) {
737 if (!ref->peer_ref && !mirror)
738 continue;
740 /* Check for statuses set by set_ref_status_for_push() */
741 switch (ref->status) {
742 case REF_STATUS_REJECT_NONFASTFORWARD:
743 case REF_STATUS_REJECT_ALREADY_EXISTS:
744 case REF_STATUS_UPTODATE:
745 continue;
746 default:
747 ; /* do nothing */
750 if (force_all)
751 ref->force = 1;
753 strbuf_addstr(&buf, "push ");
754 if (!ref->deletion) {
755 if (ref->force)
756 strbuf_addch(&buf, '+');
757 if (ref->peer_ref)
758 strbuf_addstr(&buf, ref->peer_ref->name);
759 else
760 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
762 strbuf_addch(&buf, ':');
763 strbuf_addstr(&buf, ref->name);
764 strbuf_addch(&buf, '\n');
766 if (buf.len == 0)
767 return 0;
769 standard_options(transport);
771 if (flags & TRANSPORT_PUSH_DRY_RUN) {
772 if (set_helper_option(transport, "dry-run", "true") != 0)
773 die("helper %s does not support dry-run", data->name);
776 strbuf_addch(&buf, '\n');
777 sendline(data, &buf);
778 strbuf_release(&buf);
780 push_update_refs_status(data, remote_refs);
781 return 0;
784 static int push_refs_with_export(struct transport *transport,
785 struct ref *remote_refs, int flags)
787 struct ref *ref;
788 struct child_process *helper, exporter;
789 struct helper_data *data = transport->data;
790 struct string_list revlist_args = STRING_LIST_INIT_NODUP;
791 struct strbuf buf = STRBUF_INIT;
793 helper = get_helper(transport);
795 write_constant(helper->in, "export\n");
797 strbuf_reset(&buf);
799 for (ref = remote_refs; ref; ref = ref->next) {
800 char *private;
801 unsigned char sha1[20];
803 if (!data->refspecs)
804 continue;
805 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
806 if (private && !get_sha1(private, sha1)) {
807 strbuf_addf(&buf, "^%s", private);
808 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
810 free(private);
812 if (ref->deletion) {
813 die("remote-helpers do not support ref deletion");
816 if (ref->peer_ref)
817 string_list_append(&revlist_args, ref->peer_ref->name);
821 if (get_exporter(transport, &exporter, &revlist_args))
822 die("Couldn't run fast-export");
824 if (finish_command(&exporter))
825 die("Error while running fast-export");
826 push_update_refs_status(data, remote_refs);
827 return 0;
830 static int push_refs(struct transport *transport,
831 struct ref *remote_refs, int flags)
833 struct helper_data *data = transport->data;
835 if (process_connect(transport, 1)) {
836 do_take_over(transport);
837 return transport->push_refs(transport, remote_refs, flags);
840 if (!remote_refs) {
841 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
842 "Perhaps you should specify a branch such as 'master'.\n");
843 return 0;
846 if (data->push)
847 return push_refs_with_push(transport, remote_refs, flags);
849 if (data->export)
850 return push_refs_with_export(transport, remote_refs, flags);
852 return -1;
856 static int has_attribute(const char *attrs, const char *attr) {
857 int len;
858 if (!attrs)
859 return 0;
861 len = strlen(attr);
862 for (;;) {
863 const char *space = strchrnul(attrs, ' ');
864 if (len == space - attrs && !strncmp(attrs, attr, len))
865 return 1;
866 if (!*space)
867 return 0;
868 attrs = space + 1;
872 static struct ref *get_refs_list(struct transport *transport, int for_push)
874 struct helper_data *data = transport->data;
875 struct child_process *helper;
876 struct ref *ret = NULL;
877 struct ref **tail = &ret;
878 struct ref *posn;
879 struct strbuf buf = STRBUF_INIT;
881 helper = get_helper(transport);
883 if (process_connect(transport, for_push)) {
884 do_take_over(transport);
885 return transport->get_refs_list(transport, for_push);
888 if (data->push && for_push)
889 write_str_in_full(helper->in, "list for-push\n");
890 else
891 write_str_in_full(helper->in, "list\n");
893 while (1) {
894 char *eov, *eon;
895 recvline(data, &buf);
897 if (!*buf.buf)
898 break;
900 eov = strchr(buf.buf, ' ');
901 if (!eov)
902 die("Malformed response in ref list: %s", buf.buf);
903 eon = strchr(eov + 1, ' ');
904 *eov = '\0';
905 if (eon)
906 *eon = '\0';
907 *tail = alloc_ref(eov + 1);
908 if (buf.buf[0] == '@')
909 (*tail)->symref = xstrdup(buf.buf + 1);
910 else if (buf.buf[0] != '?')
911 get_sha1_hex(buf.buf, (*tail)->old_sha1);
912 if (eon) {
913 if (has_attribute(eon + 1, "unchanged")) {
914 (*tail)->status |= REF_STATUS_UPTODATE;
915 read_ref((*tail)->name, (*tail)->old_sha1);
918 tail = &((*tail)->next);
920 if (debug)
921 fprintf(stderr, "Debug: Read ref listing.\n");
922 strbuf_release(&buf);
924 for (posn = ret; posn; posn = posn->next)
925 resolve_remote_symref(posn, ret);
927 return ret;
930 int transport_helper_init(struct transport *transport, const char *name)
932 struct helper_data *data = xcalloc(sizeof(*data), 1);
933 data->name = name;
935 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
936 debug = 1;
938 transport->data = data;
939 transport->set_option = set_helper_option;
940 transport->get_refs_list = get_refs_list;
941 transport->fetch = fetch;
942 transport->push_refs = push_refs;
943 transport->disconnect = release_helper;
944 transport->connect = connect_helper;
945 transport->smart_options = &(data->transport_options);
946 return 0;
950 * Linux pipes can buffer 65536 bytes at once (and most platforms can
951 * buffer less), so attempt reads and writes with up to that size.
953 #define BUFFERSIZE 65536
954 /* This should be enough to hold debugging message. */
955 #define PBUFFERSIZE 8192
957 /* Print bidirectional transfer loop debug message. */
958 static void transfer_debug(const char *fmt, ...)
960 va_list args;
961 char msgbuf[PBUFFERSIZE];
962 static int debug_enabled = -1;
964 if (debug_enabled < 0)
965 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
966 if (!debug_enabled)
967 return;
969 va_start(args, fmt);
970 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
971 va_end(args);
972 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
975 /* Stream state: More data may be coming in this direction. */
976 #define SSTATE_TRANSFERING 0
978 * Stream state: No more data coming in this direction, flushing rest of
979 * data.
981 #define SSTATE_FLUSHING 1
982 /* Stream state: Transfer in this direction finished. */
983 #define SSTATE_FINISHED 2
985 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
986 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
987 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
989 /* Unidirectional transfer. */
990 struct unidirectional_transfer {
991 /* Source */
992 int src;
993 /* Destination */
994 int dest;
995 /* Is source socket? */
996 int src_is_sock;
997 /* Is destination socket? */
998 int dest_is_sock;
999 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1000 int state;
1001 /* Buffer. */
1002 char buf[BUFFERSIZE];
1003 /* Buffer used. */
1004 size_t bufuse;
1005 /* Name of source. */
1006 const char *src_name;
1007 /* Name of destination. */
1008 const char *dest_name;
1011 /* Closes the target (for writing) if transfer has finished. */
1012 static void udt_close_if_finished(struct unidirectional_transfer *t)
1014 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1015 t->state = SSTATE_FINISHED;
1016 if (t->dest_is_sock)
1017 shutdown(t->dest, SHUT_WR);
1018 else
1019 close(t->dest);
1020 transfer_debug("Closed %s.", t->dest_name);
1025 * Tries to read read data from source into buffer. If buffer is full,
1026 * no data is read. Returns 0 on success, -1 on error.
1028 static int udt_do_read(struct unidirectional_transfer *t)
1030 ssize_t bytes;
1032 if (t->bufuse == BUFFERSIZE)
1033 return 0; /* No space for more. */
1035 transfer_debug("%s is readable", t->src_name);
1036 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1037 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1038 errno != EINTR) {
1039 error("read(%s) failed: %s", t->src_name, strerror(errno));
1040 return -1;
1041 } else if (bytes == 0) {
1042 transfer_debug("%s EOF (with %i bytes in buffer)",
1043 t->src_name, t->bufuse);
1044 t->state = SSTATE_FLUSHING;
1045 } else if (bytes > 0) {
1046 t->bufuse += bytes;
1047 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1048 (int)bytes, t->src_name, (int)t->bufuse);
1050 return 0;
1053 /* Tries to write data from buffer into destination. If buffer is empty,
1054 * no data is written. Returns 0 on success, -1 on error.
1056 static int udt_do_write(struct unidirectional_transfer *t)
1058 ssize_t bytes;
1060 if (t->bufuse == 0)
1061 return 0; /* Nothing to write. */
1063 transfer_debug("%s is writable", t->dest_name);
1064 bytes = write(t->dest, t->buf, t->bufuse);
1065 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1066 errno != EINTR) {
1067 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1068 return -1;
1069 } else if (bytes > 0) {
1070 t->bufuse -= bytes;
1071 if (t->bufuse)
1072 memmove(t->buf, t->buf + bytes, t->bufuse);
1073 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1074 (int)bytes, t->dest_name, (int)t->bufuse);
1076 return 0;
1080 /* State of bidirectional transfer loop. */
1081 struct bidirectional_transfer_state {
1082 /* Direction from program to git. */
1083 struct unidirectional_transfer ptg;
1084 /* Direction from git to program. */
1085 struct unidirectional_transfer gtp;
1088 static void *udt_copy_task_routine(void *udt)
1090 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1091 while (t->state != SSTATE_FINISHED) {
1092 if (STATE_NEEDS_READING(t->state))
1093 if (udt_do_read(t))
1094 return NULL;
1095 if (STATE_NEEDS_WRITING(t->state))
1096 if (udt_do_write(t))
1097 return NULL;
1098 if (STATE_NEEDS_CLOSING(t->state))
1099 udt_close_if_finished(t);
1101 return udt; /* Just some non-NULL value. */
1104 #ifndef NO_PTHREADS
1107 * Join thread, with apporiate errors on failure. Name is name for the
1108 * thread (for error messages). Returns 0 on success, 1 on failure.
1110 static int tloop_join(pthread_t thread, const char *name)
1112 int err;
1113 void *tret;
1114 err = pthread_join(thread, &tret);
1115 if (!tret) {
1116 error("%s thread failed", name);
1117 return 1;
1119 if (err) {
1120 error("%s thread failed to join: %s", name, strerror(err));
1121 return 1;
1123 return 0;
1127 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1128 * -1 on failure.
1130 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1132 pthread_t gtp_thread;
1133 pthread_t ptg_thread;
1134 int err;
1135 int ret = 0;
1136 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1137 &s->gtp);
1138 if (err)
1139 die("Can't start thread for copying data: %s", strerror(err));
1140 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1141 &s->ptg);
1142 if (err)
1143 die("Can't start thread for copying data: %s", strerror(err));
1145 ret |= tloop_join(gtp_thread, "Git to program copy");
1146 ret |= tloop_join(ptg_thread, "Program to git copy");
1147 return ret;
1149 #else
1151 /* Close the source and target (for writing) for transfer. */
1152 static void udt_kill_transfer(struct unidirectional_transfer *t)
1154 t->state = SSTATE_FINISHED;
1156 * Socket read end left open isn't a disaster if nobody
1157 * attempts to read from it (mingw compat headers do not
1158 * have SHUT_RD)...
1160 * We can't fully close the socket since otherwise gtp
1161 * task would first close the socket it sends data to
1162 * while closing the ptg file descriptors.
1164 if (!t->src_is_sock)
1165 close(t->src);
1166 if (t->dest_is_sock)
1167 shutdown(t->dest, SHUT_WR);
1168 else
1169 close(t->dest);
1173 * Join process, with apporiate errors on failure. Name is name for the
1174 * process (for error messages). Returns 0 on success, 1 on failure.
1176 static int tloop_join(pid_t pid, const char *name)
1178 int tret;
1179 if (waitpid(pid, &tret, 0) < 0) {
1180 error("%s process failed to wait: %s", name, strerror(errno));
1181 return 1;
1183 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1184 error("%s process failed", name);
1185 return 1;
1187 return 0;
1191 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1192 * -1 on failure.
1194 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1196 pid_t pid1, pid2;
1197 int ret = 0;
1199 /* Fork thread #1: git to program. */
1200 pid1 = fork();
1201 if (pid1 < 0)
1202 die_errno("Can't start thread for copying data");
1203 else if (pid1 == 0) {
1204 udt_kill_transfer(&s->ptg);
1205 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1208 /* Fork thread #2: program to git. */
1209 pid2 = fork();
1210 if (pid2 < 0)
1211 die_errno("Can't start thread for copying data");
1212 else if (pid2 == 0) {
1213 udt_kill_transfer(&s->gtp);
1214 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1218 * Close both streams in parent as to not interfere with
1219 * end of file detection and wait for both tasks to finish.
1221 udt_kill_transfer(&s->gtp);
1222 udt_kill_transfer(&s->ptg);
1223 ret |= tloop_join(pid1, "Git to program copy");
1224 ret |= tloop_join(pid2, "Program to git copy");
1225 return ret;
1227 #endif
1230 * Copies data from stdin to output and from input to stdout simultaneously.
1231 * Additionally filtering through given filter. If filter is NULL, uses
1232 * identity filter.
1234 int bidirectional_transfer_loop(int input, int output)
1236 struct bidirectional_transfer_state state;
1238 /* Fill the state fields. */
1239 state.ptg.src = input;
1240 state.ptg.dest = 1;
1241 state.ptg.src_is_sock = (input == output);
1242 state.ptg.dest_is_sock = 0;
1243 state.ptg.state = SSTATE_TRANSFERING;
1244 state.ptg.bufuse = 0;
1245 state.ptg.src_name = "remote input";
1246 state.ptg.dest_name = "stdout";
1248 state.gtp.src = 0;
1249 state.gtp.dest = output;
1250 state.gtp.src_is_sock = 0;
1251 state.gtp.dest_is_sock = (input == output);
1252 state.gtp.state = SSTATE_TRANSFERING;
1253 state.gtp.bufuse = 0;
1254 state.gtp.src_name = "stdin";
1255 state.gtp.dest_name = "remote output";
1257 return tloop_spawnwait_tasks(&state);