Merge branch 'master' of git://github.com/alshopov/git-po
[git.git] / transport-helper.c
blob508015023176290ec0f8d78043d852cdd37d5ce6
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 "transport-internal.h"
16 static int debug;
18 struct helper_data {
19 const char *name;
20 struct child_process *helper;
21 FILE *out;
22 unsigned fetch : 1,
23 import : 1,
24 bidi_import : 1,
25 export : 1,
26 option : 1,
27 push : 1,
28 connect : 1,
29 signed_tags : 1,
30 check_connectivity : 1,
31 no_disconnect_req : 1,
32 no_private_update : 1;
33 char *export_marks;
34 char *import_marks;
35 /* These go from remote name (as in "list") to private name */
36 struct refspec *refspecs;
37 int refspec_nr;
38 /* Transport options for fetch-pack/send-pack (should one of
39 * those be invoked).
41 struct git_transport_options transport_options;
44 static void sendline(struct helper_data *helper, struct strbuf *buffer)
46 if (debug)
47 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
48 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
49 die_errno("Full write to remote helper failed");
52 static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
54 strbuf_reset(buffer);
55 if (debug)
56 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
57 if (strbuf_getline(buffer, helper) == EOF) {
58 if (debug)
59 fprintf(stderr, "Debug: Remote helper quit.\n");
60 return 1;
63 if (debug)
64 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
65 return 0;
68 static int recvline(struct helper_data *helper, struct strbuf *buffer)
70 return recvline_fh(helper->out, buffer, helper->name);
73 static void write_constant(int fd, const char *str)
75 if (debug)
76 fprintf(stderr, "Debug: Remote helper: -> %s", str);
77 if (write_in_full(fd, str, strlen(str)) < 0)
78 die_errno("Full write to remote helper failed");
81 static const char *remove_ext_force(const char *url)
83 if (url) {
84 const char *colon = strchr(url, ':');
85 if (colon && colon[1] == ':')
86 return colon + 2;
88 return url;
91 static void do_take_over(struct transport *transport)
93 struct helper_data *data;
94 data = (struct helper_data *)transport->data;
95 transport_take_over(transport, data->helper);
96 fclose(data->out);
97 free(data);
100 static void standard_options(struct transport *t);
102 static struct child_process *get_helper(struct transport *transport)
104 struct helper_data *data = transport->data;
105 struct strbuf buf = STRBUF_INIT;
106 struct child_process *helper;
107 const char **refspecs = NULL;
108 int refspec_nr = 0;
109 int refspec_alloc = 0;
110 int duped;
111 int code;
113 if (data->helper)
114 return data->helper;
116 helper = xmalloc(sizeof(*helper));
117 child_process_init(helper);
118 helper->in = -1;
119 helper->out = -1;
120 helper->err = 0;
121 argv_array_pushf(&helper->args, "git-remote-%s", data->name);
122 argv_array_push(&helper->args, transport->remote->name);
123 argv_array_push(&helper->args, remove_ext_force(transport->url));
124 helper->git_cmd = 0;
125 helper->silent_exec_failure = 1;
127 if (have_git_dir())
128 argv_array_pushf(&helper->env_array, "%s=%s",
129 GIT_DIR_ENVIRONMENT, get_git_dir());
131 code = start_command(helper);
132 if (code < 0 && errno == ENOENT)
133 die("Unable to find remote helper for '%s'", data->name);
134 else if (code != 0)
135 exit(code);
137 data->helper = helper;
138 data->no_disconnect_req = 0;
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.
146 duped = dup(helper->out);
147 if (duped < 0)
148 die_errno("Can't dup helper output fd");
149 data->out = xfdopen(duped, "r");
151 write_constant(helper->in, "capabilities\n");
153 while (1) {
154 const char *capname, *arg;
155 int mandatory = 0;
156 if (recvline(data, &buf))
157 exit(128);
159 if (!*buf.buf)
160 break;
162 if (*buf.buf == '*') {
163 capname = buf.buf + 1;
164 mandatory = 1;
165 } else
166 capname = buf.buf;
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 (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) {
185 ALLOC_GROW(refspecs,
186 refspec_nr + 1,
187 refspec_alloc);
188 refspecs[refspec_nr++] = xstrdup(arg);
189 } else if (!strcmp(capname, "connect")) {
190 data->connect = 1;
191 } else if (!strcmp(capname, "signed-tags")) {
192 data->signed_tags = 1;
193 } else if (skip_prefix(capname, "export-marks ", &arg)) {
194 data->export_marks = xstrdup(arg);
195 } else if (skip_prefix(capname, "import-marks ", &arg)) {
196 data->import_marks = xstrdup(arg);
197 } else if (starts_with(capname, "no-private-update")) {
198 data->no_private_update = 1;
199 } else if (mandatory) {
200 die("Unknown mandatory capability %s. This remote "
201 "helper probably needs newer version of Git.",
202 capname);
205 if (refspecs) {
206 int i;
207 data->refspec_nr = refspec_nr;
208 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
209 for (i = 0; i < refspec_nr; i++)
210 free((char *)refspecs[i]);
211 free(refspecs);
212 } else if (data->import || data->bidi_import || data->export) {
213 warning("This remote helper should implement refspec capability.");
215 strbuf_release(&buf);
216 if (debug)
217 fprintf(stderr, "Debug: Capabilities complete.\n");
218 standard_options(transport);
219 return data->helper;
222 static int disconnect_helper(struct transport *transport)
224 struct helper_data *data = transport->data;
225 int res = 0;
227 if (data->helper) {
228 if (debug)
229 fprintf(stderr, "Debug: Disconnecting.\n");
230 if (!data->no_disconnect_req) {
232 * Ignore write errors; there's nothing we can do,
233 * since we're about to close the pipe anyway. And the
234 * most likely error is EPIPE due to the helper dying
235 * to report an error itself.
237 sigchain_push(SIGPIPE, SIG_IGN);
238 xwrite(data->helper->in, "\n", 1);
239 sigchain_pop(SIGPIPE);
241 close(data->helper->in);
242 close(data->helper->out);
243 fclose(data->out);
244 res = finish_command(data->helper);
245 FREE_AND_NULL(data->helper);
247 return res;
250 static const char *unsupported_options[] = {
251 TRANS_OPT_UPLOADPACK,
252 TRANS_OPT_RECEIVEPACK,
253 TRANS_OPT_THIN,
254 TRANS_OPT_KEEP
257 static const char *boolean_options[] = {
258 TRANS_OPT_THIN,
259 TRANS_OPT_KEEP,
260 TRANS_OPT_FOLLOWTAGS,
261 TRANS_OPT_DEEPEN_RELATIVE
264 static int strbuf_set_helper_option(struct helper_data *data,
265 struct strbuf *buf)
267 int ret;
269 sendline(data, buf);
270 if (recvline(data, buf))
271 exit(128);
273 if (!strcmp(buf->buf, "ok"))
274 ret = 0;
275 else if (starts_with(buf->buf, "error"))
276 ret = -1;
277 else if (!strcmp(buf->buf, "unsupported"))
278 ret = 1;
279 else {
280 warning("%s unexpectedly said: '%s'", data->name, buf->buf);
281 ret = 1;
283 return ret;
286 static int string_list_set_helper_option(struct helper_data *data,
287 const char *name,
288 struct string_list *list)
290 struct strbuf buf = STRBUF_INIT;
291 int i, ret = 0;
293 for (i = 0; i < list->nr; i++) {
294 strbuf_addf(&buf, "option %s ", name);
295 quote_c_style(list->items[i].string, &buf, NULL, 0);
296 strbuf_addch(&buf, '\n');
298 if ((ret = strbuf_set_helper_option(data, &buf)))
299 break;
300 strbuf_reset(&buf);
302 strbuf_release(&buf);
303 return ret;
306 static int set_helper_option(struct transport *transport,
307 const char *name, const char *value)
309 struct helper_data *data = transport->data;
310 struct strbuf buf = STRBUF_INIT;
311 int i, ret, is_bool = 0;
313 get_helper(transport);
315 if (!data->option)
316 return 1;
318 if (!strcmp(name, "deepen-not"))
319 return string_list_set_helper_option(data, name,
320 (struct string_list *)value);
322 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
323 if (!strcmp(name, unsupported_options[i]))
324 return 1;
327 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
328 if (!strcmp(name, boolean_options[i])) {
329 is_bool = 1;
330 break;
334 strbuf_addf(&buf, "option %s ", name);
335 if (is_bool)
336 strbuf_addstr(&buf, value ? "true" : "false");
337 else
338 quote_c_style(value, &buf, NULL, 0);
339 strbuf_addch(&buf, '\n');
341 ret = strbuf_set_helper_option(data, &buf);
342 strbuf_release(&buf);
343 return ret;
346 static void standard_options(struct transport *t)
348 char buf[16];
349 int v = t->verbose;
351 set_helper_option(t, "progress", t->progress ? "true" : "false");
353 xsnprintf(buf, sizeof(buf), "%d", v + 1);
354 set_helper_option(t, "verbosity", buf);
356 switch (t->family) {
357 case TRANSPORT_FAMILY_ALL:
359 * this is already the default,
360 * do not break old remote helpers by setting "all" here
362 break;
363 case TRANSPORT_FAMILY_IPV4:
364 set_helper_option(t, "family", "ipv4");
365 break;
366 case TRANSPORT_FAMILY_IPV6:
367 set_helper_option(t, "family", "ipv6");
368 break;
372 static int release_helper(struct transport *transport)
374 int res = 0;
375 struct helper_data *data = transport->data;
376 free_refspec(data->refspec_nr, data->refspecs);
377 data->refspecs = NULL;
378 res = disconnect_helper(transport);
379 free(transport->data);
380 return res;
383 static int fetch_with_fetch(struct transport *transport,
384 int nr_heads, struct ref **to_fetch)
386 struct helper_data *data = transport->data;
387 int i;
388 struct strbuf buf = STRBUF_INIT;
390 for (i = 0; i < nr_heads; i++) {
391 const struct ref *posn = to_fetch[i];
392 if (posn->status & REF_STATUS_UPTODATE)
393 continue;
395 strbuf_addf(&buf, "fetch %s %s\n",
396 oid_to_hex(&posn->old_oid),
397 posn->symref ? posn->symref : posn->name);
400 strbuf_addch(&buf, '\n');
401 sendline(data, &buf);
403 while (1) {
404 if (recvline(data, &buf))
405 exit(128);
407 if (starts_with(buf.buf, "lock ")) {
408 const char *name = buf.buf + 5;
409 if (transport->pack_lockfile)
410 warning("%s also locked %s", data->name, name);
411 else
412 transport->pack_lockfile = xstrdup(name);
414 else if (data->check_connectivity &&
415 data->transport_options.check_self_contained_and_connected &&
416 !strcmp(buf.buf, "connectivity-ok"))
417 data->transport_options.self_contained_and_connected = 1;
418 else if (!buf.len)
419 break;
420 else
421 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
423 strbuf_release(&buf);
424 return 0;
427 static int get_importer(struct transport *transport, struct child_process *fastimport)
429 struct child_process *helper = get_helper(transport);
430 struct helper_data *data = transport->data;
431 int cat_blob_fd, code;
432 child_process_init(fastimport);
433 fastimport->in = helper->out;
434 argv_array_push(&fastimport->args, "fast-import");
435 argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
437 if (data->bidi_import) {
438 cat_blob_fd = xdup(helper->in);
439 argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
441 fastimport->git_cmd = 1;
443 code = start_command(fastimport);
444 return code;
447 static int get_exporter(struct transport *transport,
448 struct child_process *fastexport,
449 struct string_list *revlist_args)
451 struct helper_data *data = transport->data;
452 struct child_process *helper = get_helper(transport);
453 int i;
455 child_process_init(fastexport);
457 /* we need to duplicate helper->in because we want to use it after
458 * fastexport is done with it. */
459 fastexport->out = dup(helper->in);
460 argv_array_push(&fastexport->args, "fast-export");
461 argv_array_push(&fastexport->args, "--use-done-feature");
462 argv_array_push(&fastexport->args, data->signed_tags ?
463 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
464 if (data->export_marks)
465 argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
466 if (data->import_marks)
467 argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
469 for (i = 0; i < revlist_args->nr; i++)
470 argv_array_push(&fastexport->args, revlist_args->items[i].string);
472 fastexport->git_cmd = 1;
473 return start_command(fastexport);
476 static int fetch_with_import(struct transport *transport,
477 int nr_heads, struct ref **to_fetch)
479 struct child_process fastimport;
480 struct helper_data *data = transport->data;
481 int i;
482 struct ref *posn;
483 struct strbuf buf = STRBUF_INIT;
485 get_helper(transport);
487 if (get_importer(transport, &fastimport))
488 die("Couldn't run fast-import");
490 for (i = 0; i < nr_heads; i++) {
491 posn = to_fetch[i];
492 if (posn->status & REF_STATUS_UPTODATE)
493 continue;
495 strbuf_addf(&buf, "import %s\n",
496 posn->symref ? posn->symref : posn->name);
497 sendline(data, &buf);
498 strbuf_reset(&buf);
501 write_constant(data->helper->in, "\n");
503 * remote-helpers that advertise the bidi-import capability are required to
504 * buffer the complete batch of import commands until this newline before
505 * sending data to fast-import.
506 * These helpers read back data from fast-import on their stdin, which could
507 * be mixed with import commands, otherwise.
510 if (finish_command(&fastimport))
511 die("Error while running fast-import");
514 * The fast-import stream of a remote helper that advertises
515 * the "refspec" capability writes to the refs named after the
516 * right hand side of the first refspec matching each ref we
517 * were fetching.
519 * (If no "refspec" capability was specified, for historical
520 * reasons we default to the equivalent of *:*.)
522 * Store the result in to_fetch[i].old_sha1. Callers such
523 * as "git fetch" can use the value to write feedback to the
524 * terminal, populate FETCH_HEAD, and determine what new value
525 * should be written to peer_ref if the update is a
526 * fast-forward or this is a forced update.
528 for (i = 0; i < nr_heads; i++) {
529 char *private, *name;
530 posn = to_fetch[i];
531 if (posn->status & REF_STATUS_UPTODATE)
532 continue;
533 name = posn->symref ? posn->symref : posn->name;
534 if (data->refspecs)
535 private = apply_refspecs(data->refspecs, data->refspec_nr, name);
536 else
537 private = xstrdup(name);
538 if (private) {
539 if (read_ref(private, &posn->old_oid) < 0)
540 die("Could not read ref %s", private);
541 free(private);
544 strbuf_release(&buf);
545 return 0;
548 static int process_connect_service(struct transport *transport,
549 const char *name, const char *exec)
551 struct helper_data *data = transport->data;
552 struct strbuf cmdbuf = STRBUF_INIT;
553 struct child_process *helper;
554 int r, duped, ret = 0;
555 FILE *input;
557 helper = get_helper(transport);
560 * Yes, dup the pipe another time, as we need unbuffered version
561 * of input pipe as FILE*. fclose() closes the underlying fd and
562 * stream buffering only can be changed before first I/O operation
563 * on it.
565 duped = dup(helper->out);
566 if (duped < 0)
567 die_errno("Can't dup helper output fd");
568 input = xfdopen(duped, "r");
569 setvbuf(input, NULL, _IONBF, 0);
572 * Handle --upload-pack and friends. This is fire and forget...
573 * just warn if it fails.
575 if (strcmp(name, exec)) {
576 r = set_helper_option(transport, "servpath", exec);
577 if (r > 0)
578 warning("Setting remote service path not supported by protocol.");
579 else if (r < 0)
580 warning("Invalid remote service path.");
583 if (data->connect)
584 strbuf_addf(&cmdbuf, "connect %s\n", name);
585 else
586 goto exit;
588 sendline(data, &cmdbuf);
589 if (recvline_fh(input, &cmdbuf, name))
590 exit(128);
592 if (!strcmp(cmdbuf.buf, "")) {
593 data->no_disconnect_req = 1;
594 if (debug)
595 fprintf(stderr, "Debug: Smart transport connection "
596 "ready.\n");
597 ret = 1;
598 } else if (!strcmp(cmdbuf.buf, "fallback")) {
599 if (debug)
600 fprintf(stderr, "Debug: Falling back to dumb "
601 "transport.\n");
602 } else
603 die("Unknown response to connect: %s",
604 cmdbuf.buf);
606 exit:
607 strbuf_release(&cmdbuf);
608 fclose(input);
609 return ret;
612 static int process_connect(struct transport *transport,
613 int for_push)
615 struct helper_data *data = transport->data;
616 const char *name;
617 const char *exec;
619 name = for_push ? "git-receive-pack" : "git-upload-pack";
620 if (for_push)
621 exec = data->transport_options.receivepack;
622 else
623 exec = data->transport_options.uploadpack;
625 return process_connect_service(transport, name, exec);
628 static int connect_helper(struct transport *transport, const char *name,
629 const char *exec, int fd[2])
631 struct helper_data *data = transport->data;
633 /* Get_helper so connect is inited. */
634 get_helper(transport);
635 if (!data->connect)
636 die("Operation not supported by protocol.");
638 if (!process_connect_service(transport, name, exec))
639 die("Can't connect to subservice %s.", name);
641 fd[0] = data->helper->out;
642 fd[1] = data->helper->in;
643 return 0;
646 static int fetch(struct transport *transport,
647 int nr_heads, struct ref **to_fetch)
649 struct helper_data *data = transport->data;
650 int i, count;
652 if (process_connect(transport, 0)) {
653 do_take_over(transport);
654 return transport->vtable->fetch(transport, nr_heads, to_fetch);
657 count = 0;
658 for (i = 0; i < nr_heads; i++)
659 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
660 count++;
662 if (!count)
663 return 0;
665 if (data->check_connectivity &&
666 data->transport_options.check_self_contained_and_connected)
667 set_helper_option(transport, "check-connectivity", "true");
669 if (transport->cloning)
670 set_helper_option(transport, "cloning", "true");
672 if (data->transport_options.update_shallow)
673 set_helper_option(transport, "update-shallow", "true");
675 if (data->fetch)
676 return fetch_with_fetch(transport, nr_heads, to_fetch);
678 if (data->import)
679 return fetch_with_import(transport, nr_heads, to_fetch);
681 return -1;
684 static int push_update_ref_status(struct strbuf *buf,
685 struct ref **ref,
686 struct ref *remote_refs)
688 char *refname, *msg;
689 int status, forced = 0;
691 if (starts_with(buf->buf, "ok ")) {
692 status = REF_STATUS_OK;
693 refname = buf->buf + 3;
694 } else if (starts_with(buf->buf, "error ")) {
695 status = REF_STATUS_REMOTE_REJECT;
696 refname = buf->buf + 6;
697 } else
698 die("expected ok/error, helper said '%s'", buf->buf);
700 msg = strchr(refname, ' ');
701 if (msg) {
702 struct strbuf msg_buf = STRBUF_INIT;
703 const char *end;
705 *msg++ = '\0';
706 if (!unquote_c_style(&msg_buf, msg, &end))
707 msg = strbuf_detach(&msg_buf, NULL);
708 else
709 msg = xstrdup(msg);
710 strbuf_release(&msg_buf);
712 if (!strcmp(msg, "no match")) {
713 status = REF_STATUS_NONE;
714 FREE_AND_NULL(msg);
716 else if (!strcmp(msg, "up to date")) {
717 status = REF_STATUS_UPTODATE;
718 FREE_AND_NULL(msg);
720 else if (!strcmp(msg, "non-fast forward")) {
721 status = REF_STATUS_REJECT_NONFASTFORWARD;
722 FREE_AND_NULL(msg);
724 else if (!strcmp(msg, "already exists")) {
725 status = REF_STATUS_REJECT_ALREADY_EXISTS;
726 FREE_AND_NULL(msg);
728 else if (!strcmp(msg, "fetch first")) {
729 status = REF_STATUS_REJECT_FETCH_FIRST;
730 FREE_AND_NULL(msg);
732 else if (!strcmp(msg, "needs force")) {
733 status = REF_STATUS_REJECT_NEEDS_FORCE;
734 FREE_AND_NULL(msg);
736 else if (!strcmp(msg, "stale info")) {
737 status = REF_STATUS_REJECT_STALE;
738 FREE_AND_NULL(msg);
740 else if (!strcmp(msg, "forced update")) {
741 forced = 1;
742 FREE_AND_NULL(msg);
746 if (*ref)
747 *ref = find_ref_by_name(*ref, refname);
748 if (!*ref)
749 *ref = find_ref_by_name(remote_refs, refname);
750 if (!*ref) {
751 warning("helper reported unexpected status of %s", refname);
752 return 1;
755 if ((*ref)->status != REF_STATUS_NONE) {
757 * Earlier, the ref was marked not to be pushed, so ignore the ref
758 * status reported by the remote helper if the latter is 'no match'.
760 if (status == REF_STATUS_NONE)
761 return 1;
764 (*ref)->status = status;
765 (*ref)->forced_update |= forced;
766 (*ref)->remote_status = msg;
767 return !(status == REF_STATUS_OK);
770 static int push_update_refs_status(struct helper_data *data,
771 struct ref *remote_refs,
772 int flags)
774 struct strbuf buf = STRBUF_INIT;
775 struct ref *ref = remote_refs;
776 int ret = 0;
778 for (;;) {
779 char *private;
781 if (recvline(data, &buf)) {
782 ret = 1;
783 break;
786 if (!buf.len)
787 break;
789 if (push_update_ref_status(&buf, &ref, remote_refs))
790 continue;
792 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
793 continue;
795 /* propagate back the update to the remote namespace */
796 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
797 if (!private)
798 continue;
799 update_ref("update by helper", private, &ref->new_oid, NULL,
800 0, 0);
801 free(private);
803 strbuf_release(&buf);
804 return ret;
807 static void set_common_push_options(struct transport *transport,
808 const char *name, int flags)
810 if (flags & TRANSPORT_PUSH_DRY_RUN) {
811 if (set_helper_option(transport, "dry-run", "true") != 0)
812 die("helper %s does not support dry-run", name);
813 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
814 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
815 die("helper %s does not support --signed", name);
816 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
817 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
818 die("helper %s does not support --signed=if-asked", name);
821 if (flags & TRANSPORT_PUSH_OPTIONS) {
822 struct string_list_item *item;
823 for_each_string_list_item(item, transport->push_options)
824 if (set_helper_option(transport, "push-option", item->string) != 0)
825 die("helper %s does not support 'push-option'", name);
829 static int push_refs_with_push(struct transport *transport,
830 struct ref *remote_refs, int flags)
832 int force_all = flags & TRANSPORT_PUSH_FORCE;
833 int mirror = flags & TRANSPORT_PUSH_MIRROR;
834 struct helper_data *data = transport->data;
835 struct strbuf buf = STRBUF_INIT;
836 struct ref *ref;
837 struct string_list cas_options = STRING_LIST_INIT_DUP;
838 struct string_list_item *cas_option;
840 get_helper(transport);
841 if (!data->push)
842 return 1;
844 for (ref = remote_refs; ref; ref = ref->next) {
845 if (!ref->peer_ref && !mirror)
846 continue;
848 /* Check for statuses set by set_ref_status_for_push() */
849 switch (ref->status) {
850 case REF_STATUS_REJECT_NONFASTFORWARD:
851 case REF_STATUS_REJECT_STALE:
852 case REF_STATUS_REJECT_ALREADY_EXISTS:
853 case REF_STATUS_UPTODATE:
854 continue;
855 default:
856 ; /* do nothing */
859 if (force_all)
860 ref->force = 1;
862 strbuf_addstr(&buf, "push ");
863 if (!ref->deletion) {
864 if (ref->force)
865 strbuf_addch(&buf, '+');
866 if (ref->peer_ref)
867 strbuf_addstr(&buf, ref->peer_ref->name);
868 else
869 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
871 strbuf_addch(&buf, ':');
872 strbuf_addstr(&buf, ref->name);
873 strbuf_addch(&buf, '\n');
876 * The "--force-with-lease" options without explicit
877 * values to expect have already been expanded into
878 * the ref->old_oid_expect[] field; we can ignore
879 * transport->smart_options->cas altogether and instead
880 * can enumerate them from the refs.
882 if (ref->expect_old_sha1) {
883 struct strbuf cas = STRBUF_INIT;
884 strbuf_addf(&cas, "%s:%s",
885 ref->name, oid_to_hex(&ref->old_oid_expect));
886 string_list_append_nodup(&cas_options,
887 strbuf_detach(&cas, NULL));
890 if (buf.len == 0) {
891 string_list_clear(&cas_options, 0);
892 return 0;
895 for_each_string_list_item(cas_option, &cas_options)
896 set_helper_option(transport, "cas", cas_option->string);
897 set_common_push_options(transport, data->name, flags);
899 strbuf_addch(&buf, '\n');
900 sendline(data, &buf);
901 strbuf_release(&buf);
902 string_list_clear(&cas_options, 0);
904 return push_update_refs_status(data, remote_refs, flags);
907 static int push_refs_with_export(struct transport *transport,
908 struct ref *remote_refs, int flags)
910 struct ref *ref;
911 struct child_process *helper, exporter;
912 struct helper_data *data = transport->data;
913 struct string_list revlist_args = STRING_LIST_INIT_DUP;
914 struct strbuf buf = STRBUF_INIT;
916 if (!data->refspecs)
917 die("remote-helper doesn't support push; refspec needed");
919 set_common_push_options(transport, data->name, flags);
920 if (flags & TRANSPORT_PUSH_FORCE) {
921 if (set_helper_option(transport, "force", "true") != 0)
922 warning("helper %s does not support 'force'", data->name);
925 helper = get_helper(transport);
927 write_constant(helper->in, "export\n");
929 for (ref = remote_refs; ref; ref = ref->next) {
930 char *private;
931 struct object_id oid;
933 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
934 if (private && !get_oid(private, &oid)) {
935 strbuf_addf(&buf, "^%s", private);
936 string_list_append_nodup(&revlist_args,
937 strbuf_detach(&buf, NULL));
938 oidcpy(&ref->old_oid, &oid);
940 free(private);
942 if (ref->peer_ref) {
943 if (strcmp(ref->name, ref->peer_ref->name)) {
944 if (!ref->deletion) {
945 const char *name;
946 int flag;
948 /* Follow symbolic refs (mainly for HEAD). */
949 name = resolve_ref_unsafe(ref->peer_ref->name,
950 RESOLVE_REF_READING,
951 &oid, &flag);
952 if (!name || !(flag & REF_ISSYMREF))
953 name = ref->peer_ref->name;
955 strbuf_addf(&buf, "%s:%s", name, ref->name);
956 } else
957 strbuf_addf(&buf, ":%s", ref->name);
959 string_list_append(&revlist_args, "--refspec");
960 string_list_append(&revlist_args, buf.buf);
961 strbuf_release(&buf);
963 if (!ref->deletion)
964 string_list_append(&revlist_args, ref->peer_ref->name);
968 if (get_exporter(transport, &exporter, &revlist_args))
969 die("Couldn't run fast-export");
971 string_list_clear(&revlist_args, 1);
973 if (finish_command(&exporter))
974 die("Error while running fast-export");
975 if (push_update_refs_status(data, remote_refs, flags))
976 return 1;
978 if (data->export_marks) {
979 strbuf_addf(&buf, "%s.tmp", data->export_marks);
980 rename(buf.buf, data->export_marks);
981 strbuf_release(&buf);
984 return 0;
987 static int push_refs(struct transport *transport,
988 struct ref *remote_refs, int flags)
990 struct helper_data *data = transport->data;
992 if (process_connect(transport, 1)) {
993 do_take_over(transport);
994 return transport->vtable->push_refs(transport, remote_refs, flags);
997 if (!remote_refs) {
998 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
999 "Perhaps you should specify a branch such as 'master'.\n");
1000 return 0;
1003 if (data->push)
1004 return push_refs_with_push(transport, remote_refs, flags);
1006 if (data->export)
1007 return push_refs_with_export(transport, remote_refs, flags);
1009 return -1;
1013 static int has_attribute(const char *attrs, const char *attr) {
1014 int len;
1015 if (!attrs)
1016 return 0;
1018 len = strlen(attr);
1019 for (;;) {
1020 const char *space = strchrnul(attrs, ' ');
1021 if (len == space - attrs && !strncmp(attrs, attr, len))
1022 return 1;
1023 if (!*space)
1024 return 0;
1025 attrs = space + 1;
1029 static struct ref *get_refs_list(struct transport *transport, int for_push)
1031 struct helper_data *data = transport->data;
1032 struct child_process *helper;
1033 struct ref *ret = NULL;
1034 struct ref **tail = &ret;
1035 struct ref *posn;
1036 struct strbuf buf = STRBUF_INIT;
1038 helper = get_helper(transport);
1040 if (process_connect(transport, for_push)) {
1041 do_take_over(transport);
1042 return transport->vtable->get_refs_list(transport, for_push);
1045 if (data->push && for_push)
1046 write_str_in_full(helper->in, "list for-push\n");
1047 else
1048 write_str_in_full(helper->in, "list\n");
1050 while (1) {
1051 char *eov, *eon;
1052 if (recvline(data, &buf))
1053 exit(128);
1055 if (!*buf.buf)
1056 break;
1058 eov = strchr(buf.buf, ' ');
1059 if (!eov)
1060 die("Malformed response in ref list: %s", buf.buf);
1061 eon = strchr(eov + 1, ' ');
1062 *eov = '\0';
1063 if (eon)
1064 *eon = '\0';
1065 *tail = alloc_ref(eov + 1);
1066 if (buf.buf[0] == '@')
1067 (*tail)->symref = xstrdup(buf.buf + 1);
1068 else if (buf.buf[0] != '?')
1069 get_oid_hex(buf.buf, &(*tail)->old_oid);
1070 if (eon) {
1071 if (has_attribute(eon + 1, "unchanged")) {
1072 (*tail)->status |= REF_STATUS_UPTODATE;
1073 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
1074 die(_("Could not read ref %s"),
1075 (*tail)->name);
1078 tail = &((*tail)->next);
1080 if (debug)
1081 fprintf(stderr, "Debug: Read ref listing.\n");
1082 strbuf_release(&buf);
1084 for (posn = ret; posn; posn = posn->next)
1085 resolve_remote_symref(posn, ret);
1087 return ret;
1090 static struct transport_vtable vtable = {
1091 set_helper_option,
1092 get_refs_list,
1093 fetch,
1094 push_refs,
1095 connect_helper,
1096 release_helper
1099 int transport_helper_init(struct transport *transport, const char *name)
1101 struct helper_data *data = xcalloc(1, sizeof(*data));
1102 data->name = name;
1104 transport_check_allowed(name);
1106 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1107 debug = 1;
1109 transport->data = data;
1110 transport->vtable = &vtable;
1111 transport->smart_options = &(data->transport_options);
1112 return 0;
1116 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1117 * buffer less), so attempt reads and writes with up to that size.
1119 #define BUFFERSIZE 65536
1120 /* This should be enough to hold debugging message. */
1121 #define PBUFFERSIZE 8192
1123 /* Print bidirectional transfer loop debug message. */
1124 __attribute__((format (printf, 1, 2)))
1125 static void transfer_debug(const char *fmt, ...)
1128 * NEEDSWORK: This function is sometimes used from multiple threads, and
1129 * we end up using debug_enabled racily. That "should not matter" since
1130 * we always write the same value, but it's still wrong. This function
1131 * is listed in .tsan-suppressions for the time being.
1134 va_list args;
1135 char msgbuf[PBUFFERSIZE];
1136 static int debug_enabled = -1;
1138 if (debug_enabled < 0)
1139 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1140 if (!debug_enabled)
1141 return;
1143 va_start(args, fmt);
1144 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1145 va_end(args);
1146 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1149 /* Stream state: More data may be coming in this direction. */
1150 #define SSTATE_TRANSFERRING 0
1152 * Stream state: No more data coming in this direction, flushing rest of
1153 * data.
1155 #define SSTATE_FLUSHING 1
1156 /* Stream state: Transfer in this direction finished. */
1157 #define SSTATE_FINISHED 2
1159 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1160 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1161 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1163 /* Unidirectional transfer. */
1164 struct unidirectional_transfer {
1165 /* Source */
1166 int src;
1167 /* Destination */
1168 int dest;
1169 /* Is source socket? */
1170 int src_is_sock;
1171 /* Is destination socket? */
1172 int dest_is_sock;
1173 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1174 int state;
1175 /* Buffer. */
1176 char buf[BUFFERSIZE];
1177 /* Buffer used. */
1178 size_t bufuse;
1179 /* Name of source. */
1180 const char *src_name;
1181 /* Name of destination. */
1182 const char *dest_name;
1185 /* Closes the target (for writing) if transfer has finished. */
1186 static void udt_close_if_finished(struct unidirectional_transfer *t)
1188 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1189 t->state = SSTATE_FINISHED;
1190 if (t->dest_is_sock)
1191 shutdown(t->dest, SHUT_WR);
1192 else
1193 close(t->dest);
1194 transfer_debug("Closed %s.", t->dest_name);
1199 * Tries to read data from source into buffer. If buffer is full,
1200 * no data is read. Returns 0 on success, -1 on error.
1202 static int udt_do_read(struct unidirectional_transfer *t)
1204 ssize_t bytes;
1206 if (t->bufuse == BUFFERSIZE)
1207 return 0; /* No space for more. */
1209 transfer_debug("%s is readable", t->src_name);
1210 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1211 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1212 errno != EINTR) {
1213 error_errno("read(%s) failed", t->src_name);
1214 return -1;
1215 } else if (bytes == 0) {
1216 transfer_debug("%s EOF (with %i bytes in buffer)",
1217 t->src_name, (int)t->bufuse);
1218 t->state = SSTATE_FLUSHING;
1219 } else if (bytes > 0) {
1220 t->bufuse += bytes;
1221 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1222 (int)bytes, t->src_name, (int)t->bufuse);
1224 return 0;
1227 /* Tries to write data from buffer into destination. If buffer is empty,
1228 * no data is written. Returns 0 on success, -1 on error.
1230 static int udt_do_write(struct unidirectional_transfer *t)
1232 ssize_t bytes;
1234 if (t->bufuse == 0)
1235 return 0; /* Nothing to write. */
1237 transfer_debug("%s is writable", t->dest_name);
1238 bytes = xwrite(t->dest, t->buf, t->bufuse);
1239 if (bytes < 0 && errno != EWOULDBLOCK) {
1240 error_errno("write(%s) failed", t->dest_name);
1241 return -1;
1242 } else if (bytes > 0) {
1243 t->bufuse -= bytes;
1244 if (t->bufuse)
1245 memmove(t->buf, t->buf + bytes, t->bufuse);
1246 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1247 (int)bytes, t->dest_name, (int)t->bufuse);
1249 return 0;
1253 /* State of bidirectional transfer loop. */
1254 struct bidirectional_transfer_state {
1255 /* Direction from program to git. */
1256 struct unidirectional_transfer ptg;
1257 /* Direction from git to program. */
1258 struct unidirectional_transfer gtp;
1261 static void *udt_copy_task_routine(void *udt)
1263 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1264 while (t->state != SSTATE_FINISHED) {
1265 if (STATE_NEEDS_READING(t->state))
1266 if (udt_do_read(t))
1267 return NULL;
1268 if (STATE_NEEDS_WRITING(t->state))
1269 if (udt_do_write(t))
1270 return NULL;
1271 if (STATE_NEEDS_CLOSING(t->state))
1272 udt_close_if_finished(t);
1274 return udt; /* Just some non-NULL value. */
1277 #ifndef NO_PTHREADS
1280 * Join thread, with appropriate errors on failure. Name is name for the
1281 * thread (for error messages). Returns 0 on success, 1 on failure.
1283 static int tloop_join(pthread_t thread, const char *name)
1285 int err;
1286 void *tret;
1287 err = pthread_join(thread, &tret);
1288 if (!tret) {
1289 error("%s thread failed", name);
1290 return 1;
1292 if (err) {
1293 error("%s thread failed to join: %s", name, strerror(err));
1294 return 1;
1296 return 0;
1300 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1301 * -1 on failure.
1303 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1305 pthread_t gtp_thread;
1306 pthread_t ptg_thread;
1307 int err;
1308 int ret = 0;
1309 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1310 &s->gtp);
1311 if (err)
1312 die("Can't start thread for copying data: %s", strerror(err));
1313 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1314 &s->ptg);
1315 if (err)
1316 die("Can't start thread for copying data: %s", strerror(err));
1318 ret |= tloop_join(gtp_thread, "Git to program copy");
1319 ret |= tloop_join(ptg_thread, "Program to git copy");
1320 return ret;
1322 #else
1324 /* Close the source and target (for writing) for transfer. */
1325 static void udt_kill_transfer(struct unidirectional_transfer *t)
1327 t->state = SSTATE_FINISHED;
1329 * Socket read end left open isn't a disaster if nobody
1330 * attempts to read from it (mingw compat headers do not
1331 * have SHUT_RD)...
1333 * We can't fully close the socket since otherwise gtp
1334 * task would first close the socket it sends data to
1335 * while closing the ptg file descriptors.
1337 if (!t->src_is_sock)
1338 close(t->src);
1339 if (t->dest_is_sock)
1340 shutdown(t->dest, SHUT_WR);
1341 else
1342 close(t->dest);
1346 * Join process, with appropriate errors on failure. Name is name for the
1347 * process (for error messages). Returns 0 on success, 1 on failure.
1349 static int tloop_join(pid_t pid, const char *name)
1351 int tret;
1352 if (waitpid(pid, &tret, 0) < 0) {
1353 error_errno("%s process failed to wait", name);
1354 return 1;
1356 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1357 error("%s process failed", name);
1358 return 1;
1360 return 0;
1364 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1365 * -1 on failure.
1367 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1369 pid_t pid1, pid2;
1370 int ret = 0;
1372 /* Fork thread #1: git to program. */
1373 pid1 = fork();
1374 if (pid1 < 0)
1375 die_errno("Can't start thread for copying data");
1376 else if (pid1 == 0) {
1377 udt_kill_transfer(&s->ptg);
1378 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1381 /* Fork thread #2: program to git. */
1382 pid2 = fork();
1383 if (pid2 < 0)
1384 die_errno("Can't start thread for copying data");
1385 else if (pid2 == 0) {
1386 udt_kill_transfer(&s->gtp);
1387 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1391 * Close both streams in parent as to not interfere with
1392 * end of file detection and wait for both tasks to finish.
1394 udt_kill_transfer(&s->gtp);
1395 udt_kill_transfer(&s->ptg);
1396 ret |= tloop_join(pid1, "Git to program copy");
1397 ret |= tloop_join(pid2, "Program to git copy");
1398 return ret;
1400 #endif
1403 * Copies data from stdin to output and from input to stdout simultaneously.
1404 * Additionally filtering through given filter. If filter is NULL, uses
1405 * identity filter.
1407 int bidirectional_transfer_loop(int input, int output)
1409 struct bidirectional_transfer_state state;
1411 /* Fill the state fields. */
1412 state.ptg.src = input;
1413 state.ptg.dest = 1;
1414 state.ptg.src_is_sock = (input == output);
1415 state.ptg.dest_is_sock = 0;
1416 state.ptg.state = SSTATE_TRANSFERRING;
1417 state.ptg.bufuse = 0;
1418 state.ptg.src_name = "remote input";
1419 state.ptg.dest_name = "stdout";
1421 state.gtp.src = 0;
1422 state.gtp.dest = output;
1423 state.gtp.src_is_sock = 0;
1424 state.gtp.dest_is_sock = (input == output);
1425 state.gtp.state = SSTATE_TRANSFERRING;
1426 state.gtp.bufuse = 0;
1427 state.gtp.src_name = "stdin";
1428 state.gtp.dest_name = "remote output";
1430 return tloop_spawnwait_tasks(&state);