4 #include "run-command.h"
10 #include "string-list.h"
11 #include "thread-utils.h"
13 #include "argv-array.h"
20 struct child_process *helper;
30 check_connectivity : 1,
31 no_disconnect_req : 1,
32 no_private_update : 1;
35 /* These go from remote name (as in "list") to private name */
36 struct refspec *refspecs;
38 /* Transport options for fetch-pack/send-pack (should one of
41 struct git_transport_options transport_options;
44 static void sendline(struct helper_data *helper, struct strbuf *buffer)
47 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
48 if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
50 die_errno("Full write to remote helper failed");
53 static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
57 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
58 if (strbuf_getline(buffer, helper, '\n') == EOF) {
60 fprintf(stderr, "Debug: Remote helper quit.\n");
65 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
69 static int recvline(struct helper_data *helper, struct strbuf *buffer)
71 return recvline_fh(helper->out, buffer, helper->name);
74 static void write_constant(int fd, const char *str)
77 fprintf(stderr, "Debug: Remote helper: -> %s", str);
78 if (write_in_full(fd, str, strlen(str)) != strlen(str))
79 die_errno("Full write to remote helper failed");
82 static const char *remove_ext_force(const char *url)
85 const char *colon = strchr(url, ':');
86 if (colon && colon[1] == ':')
92 static void do_take_over(struct transport *transport)
94 struct helper_data *data;
95 data = (struct helper_data *)transport->data;
96 transport_take_over(transport, data->helper);
101 static struct child_process *get_helper(struct transport *transport)
103 struct helper_data *data = transport->data;
104 struct argv_array argv = ARGV_ARRAY_INIT;
105 struct strbuf buf = STRBUF_INIT;
106 struct child_process *helper;
107 const char **refspecs = NULL;
109 int refspec_alloc = 0;
112 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
113 const char *helper_env[] = {
122 helper = xcalloc(1, sizeof(*helper));
126 argv_array_pushf(&argv, "git-remote-%s", data->name);
127 argv_array_push(&argv, transport->remote->name);
128 argv_array_push(&argv, remove_ext_force(transport->url));
129 helper->argv = argv_array_detach(&argv, NULL);
131 helper->silent_exec_failure = 1;
133 snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
134 helper->env = helper_env;
136 code = start_command(helper);
137 if (code < 0 && errno == ENOENT)
138 die("Unable to find remote helper for '%s'", data->name);
142 data->helper = helper;
143 data->no_disconnect_req = 0;
146 * Open the output as FILE* so strbuf_getline() can be used.
147 * Do this with duped fd because fclose() will close the fd,
148 * and stuff like taking over will require the fd to remain.
150 duped = dup(helper->out);
152 die_errno("Can't dup helper output fd");
153 data->out = xfdopen(duped, "r");
155 write_constant(helper->in, "capabilities\n");
160 if (recvline(data, &buf))
166 if (*buf.buf == '*') {
167 capname = buf.buf + 1;
173 fprintf(stderr, "Debug: Got cap %s\n", capname);
174 if (!strcmp(capname, "fetch"))
176 else if (!strcmp(capname, "option"))
178 else if (!strcmp(capname, "push"))
180 else if (!strcmp(capname, "import"))
182 else if (!strcmp(capname, "bidi-import"))
183 data->bidi_import = 1;
184 else if (!strcmp(capname, "export"))
186 else if (!strcmp(capname, "check-connectivity"))
187 data->check_connectivity = 1;
188 else if (!data->refspecs && starts_with(capname, "refspec ")) {
192 refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec "));
193 } else if (!strcmp(capname, "connect")) {
195 } else if (!strcmp(capname, "signed-tags")) {
196 data->signed_tags = 1;
197 } else if (starts_with(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 (starts_with(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 (starts_with(capname, "no-private-update")) {
208 data->no_private_update = 1;
209 } else if (mandatory) {
210 die("Unknown mandatory capability %s. This remote "
211 "helper probably needs newer version of Git.",
217 data->refspec_nr = refspec_nr;
218 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
219 for (i = 0; i < refspec_nr; i++)
220 free((char *)refspecs[i]);
222 } else if (data->import || data->bidi_import || data->export) {
223 warning("This remote helper should implement refspec capability.");
225 strbuf_release(&buf);
227 fprintf(stderr, "Debug: Capabilities complete.\n");
231 static int disconnect_helper(struct transport *transport)
233 struct helper_data *data = transport->data;
238 fprintf(stderr, "Debug: Disconnecting.\n");
239 if (!data->no_disconnect_req) {
241 * Ignore write errors; there's nothing we can do,
242 * since we're about to close the pipe anyway. And the
243 * most likely error is EPIPE due to the helper dying
244 * to report an error itself.
246 sigchain_push(SIGPIPE, SIG_IGN);
247 xwrite(data->helper->in, "\n", 1);
248 sigchain_pop(SIGPIPE);
250 close(data->helper->in);
251 close(data->helper->out);
253 res = finish_command(data->helper);
254 argv_array_free_detached(data->helper->argv);
261 static const char *unsupported_options[] = {
262 TRANS_OPT_UPLOADPACK,
263 TRANS_OPT_RECEIVEPACK,
268 static const char *boolean_options[] = {
274 static int set_helper_option(struct transport *transport,
275 const char *name, const char *value)
277 struct helper_data *data = transport->data;
278 struct strbuf buf = STRBUF_INIT;
279 int i, ret, is_bool = 0;
281 get_helper(transport);
286 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
287 if (!strcmp(name, unsupported_options[i]))
291 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
292 if (!strcmp(name, boolean_options[i])) {
298 strbuf_addf(&buf, "option %s ", name);
300 strbuf_addstr(&buf, value ? "true" : "false");
302 quote_c_style(value, &buf, NULL, 0);
303 strbuf_addch(&buf, '\n');
305 sendline(data, &buf);
306 if (recvline(data, &buf))
309 if (!strcmp(buf.buf, "ok"))
311 else if (starts_with(buf.buf, "error")) {
313 } else if (!strcmp(buf.buf, "unsupported"))
316 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
319 strbuf_release(&buf);
323 static void standard_options(struct transport *t)
329 set_helper_option(t, "progress", t->progress ? "true" : "false");
331 n = snprintf(buf, sizeof(buf), "%d", v + 1);
332 if (n >= sizeof(buf))
333 die("impossibly large verbosity value");
334 set_helper_option(t, "verbosity", buf);
337 static int release_helper(struct transport *transport)
340 struct helper_data *data = transport->data;
341 free_refspec(data->refspec_nr, data->refspecs);
342 data->refspecs = NULL;
343 res = disconnect_helper(transport);
344 free(transport->data);
348 static int fetch_with_fetch(struct transport *transport,
349 int nr_heads, struct ref **to_fetch)
351 struct helper_data *data = transport->data;
353 struct strbuf buf = STRBUF_INIT;
355 standard_options(transport);
356 if (data->check_connectivity &&
357 data->transport_options.check_self_contained_and_connected)
358 set_helper_option(transport, "check-connectivity", "true");
360 if (transport->cloning)
361 set_helper_option(transport, "cloning", "true");
363 if (data->transport_options.update_shallow)
364 set_helper_option(transport, "update-shallow", "true");
366 for (i = 0; i < nr_heads; i++) {
367 const struct ref *posn = to_fetch[i];
368 if (posn->status & REF_STATUS_UPTODATE)
371 strbuf_addf(&buf, "fetch %s %s\n",
372 sha1_to_hex(posn->old_sha1), posn->name);
375 strbuf_addch(&buf, '\n');
376 sendline(data, &buf);
379 if (recvline(data, &buf))
382 if (starts_with(buf.buf, "lock ")) {
383 const char *name = buf.buf + 5;
384 if (transport->pack_lockfile)
385 warning("%s also locked %s", data->name, name);
387 transport->pack_lockfile = xstrdup(name);
389 else if (data->check_connectivity &&
390 data->transport_options.check_self_contained_and_connected &&
391 !strcmp(buf.buf, "connectivity-ok"))
392 data->transport_options.self_contained_and_connected = 1;
396 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
398 strbuf_release(&buf);
402 static int get_importer(struct transport *transport, struct child_process *fastimport)
404 struct child_process *helper = get_helper(transport);
405 struct helper_data *data = transport->data;
406 struct argv_array argv = ARGV_ARRAY_INIT;
407 int cat_blob_fd, code;
408 memset(fastimport, 0, sizeof(*fastimport));
409 fastimport->in = helper->out;
410 argv_array_push(&argv, "fast-import");
411 argv_array_push(&argv, debug ? "--stats" : "--quiet");
413 if (data->bidi_import) {
414 cat_blob_fd = xdup(helper->in);
415 argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
417 fastimport->argv = argv.argv;
418 fastimport->git_cmd = 1;
420 code = start_command(fastimport);
424 static int get_exporter(struct transport *transport,
425 struct child_process *fastexport,
426 struct string_list *revlist_args)
428 struct helper_data *data = transport->data;
429 struct child_process *helper = get_helper(transport);
431 memset(fastexport, 0, sizeof(*fastexport));
433 /* we need to duplicate helper->in because we want to use it after
434 * fastexport is done with it. */
435 fastexport->out = dup(helper->in);
436 fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
437 fastexport->argv[argc++] = "fast-export";
438 fastexport->argv[argc++] = "--use-done-feature";
439 fastexport->argv[argc++] = data->signed_tags ?
440 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
441 if (data->export_marks)
442 fastexport->argv[argc++] = data->export_marks;
443 if (data->import_marks)
444 fastexport->argv[argc++] = data->import_marks;
446 for (i = 0; i < revlist_args->nr; i++)
447 fastexport->argv[argc++] = revlist_args->items[i].string;
449 fastexport->git_cmd = 1;
450 return start_command(fastexport);
453 static int fetch_with_import(struct transport *transport,
454 int nr_heads, struct ref **to_fetch)
456 struct child_process fastimport;
457 struct helper_data *data = transport->data;
460 struct strbuf buf = STRBUF_INIT;
462 get_helper(transport);
464 if (get_importer(transport, &fastimport))
465 die("Couldn't run fast-import");
467 for (i = 0; i < nr_heads; i++) {
469 if (posn->status & REF_STATUS_UPTODATE)
472 strbuf_addf(&buf, "import %s\n", posn->name);
473 sendline(data, &buf);
477 write_constant(data->helper->in, "\n");
479 * remote-helpers that advertise the bidi-import capability are required to
480 * buffer the complete batch of import commands until this newline before
481 * sending data to fast-import.
482 * These helpers read back data from fast-import on their stdin, which could
483 * be mixed with import commands, otherwise.
486 if (finish_command(&fastimport))
487 die("Error while running fast-import");
488 argv_array_free_detached(fastimport.argv);
491 * The fast-import stream of a remote helper that advertises
492 * the "refspec" capability writes to the refs named after the
493 * right hand side of the first refspec matching each ref we
496 * (If no "refspec" capability was specified, for historical
497 * reasons we default to the equivalent of *:*.)
499 * Store the result in to_fetch[i].old_sha1. Callers such
500 * as "git fetch" can use the value to write feedback to the
501 * terminal, populate FETCH_HEAD, and determine what new value
502 * should be written to peer_ref if the update is a
503 * fast-forward or this is a forced update.
505 for (i = 0; i < nr_heads; i++) {
508 if (posn->status & REF_STATUS_UPTODATE)
511 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
513 private = xstrdup(posn->name);
515 read_ref(private, posn->old_sha1);
519 strbuf_release(&buf);
523 static int process_connect_service(struct transport *transport,
524 const char *name, const char *exec)
526 struct helper_data *data = transport->data;
527 struct strbuf cmdbuf = STRBUF_INIT;
528 struct child_process *helper;
529 int r, duped, ret = 0;
532 helper = get_helper(transport);
535 * Yes, dup the pipe another time, as we need unbuffered version
536 * of input pipe as FILE*. fclose() closes the underlying fd and
537 * stream buffering only can be changed before first I/O operation
540 duped = dup(helper->out);
542 die_errno("Can't dup helper output fd");
543 input = xfdopen(duped, "r");
544 setvbuf(input, NULL, _IONBF, 0);
547 * Handle --upload-pack and friends. This is fire and forget...
548 * just warn if it fails.
550 if (strcmp(name, exec)) {
551 r = set_helper_option(transport, "servpath", exec);
553 warning("Setting remote service path not supported by protocol.");
555 warning("Invalid remote service path.");
559 strbuf_addf(&cmdbuf, "connect %s\n", name);
563 sendline(data, &cmdbuf);
564 if (recvline_fh(input, &cmdbuf, name))
567 if (!strcmp(cmdbuf.buf, "")) {
568 data->no_disconnect_req = 1;
570 fprintf(stderr, "Debug: Smart transport connection "
573 } else if (!strcmp(cmdbuf.buf, "fallback")) {
575 fprintf(stderr, "Debug: Falling back to dumb "
578 die("Unknown response to connect: %s",
586 static int process_connect(struct transport *transport,
589 struct helper_data *data = transport->data;
593 name = for_push ? "git-receive-pack" : "git-upload-pack";
595 exec = data->transport_options.receivepack;
597 exec = data->transport_options.uploadpack;
599 return process_connect_service(transport, name, exec);
602 static int connect_helper(struct transport *transport, const char *name,
603 const char *exec, int fd[2])
605 struct helper_data *data = transport->data;
607 /* Get_helper so connect is inited. */
608 get_helper(transport);
610 die("Operation not supported by protocol.");
612 if (!process_connect_service(transport, name, exec))
613 die("Can't connect to subservice %s.", name);
615 fd[0] = data->helper->out;
616 fd[1] = data->helper->in;
620 static int fetch(struct transport *transport,
621 int nr_heads, struct ref **to_fetch)
623 struct helper_data *data = transport->data;
626 if (process_connect(transport, 0)) {
627 do_take_over(transport);
628 return transport->fetch(transport, nr_heads, to_fetch);
632 for (i = 0; i < nr_heads; i++)
633 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
640 return fetch_with_fetch(transport, nr_heads, to_fetch);
643 return fetch_with_import(transport, nr_heads, to_fetch);
648 static int push_update_ref_status(struct strbuf *buf,
650 struct ref *remote_refs)
653 int status, forced = 0;
655 if (starts_with(buf->buf, "ok ")) {
656 status = REF_STATUS_OK;
657 refname = buf->buf + 3;
658 } else if (starts_with(buf->buf, "error ")) {
659 status = REF_STATUS_REMOTE_REJECT;
660 refname = buf->buf + 6;
662 die("expected ok/error, helper said '%s'", buf->buf);
664 msg = strchr(refname, ' ');
666 struct strbuf msg_buf = STRBUF_INIT;
670 if (!unquote_c_style(&msg_buf, msg, &end))
671 msg = strbuf_detach(&msg_buf, NULL);
674 strbuf_release(&msg_buf);
676 if (!strcmp(msg, "no match")) {
677 status = REF_STATUS_NONE;
681 else if (!strcmp(msg, "up to date")) {
682 status = REF_STATUS_UPTODATE;
686 else if (!strcmp(msg, "non-fast forward")) {
687 status = REF_STATUS_REJECT_NONFASTFORWARD;
691 else if (!strcmp(msg, "already exists")) {
692 status = REF_STATUS_REJECT_ALREADY_EXISTS;
696 else if (!strcmp(msg, "fetch first")) {
697 status = REF_STATUS_REJECT_FETCH_FIRST;
701 else if (!strcmp(msg, "needs force")) {
702 status = REF_STATUS_REJECT_NEEDS_FORCE;
706 else if (!strcmp(msg, "stale info")) {
707 status = REF_STATUS_REJECT_STALE;
711 else if (!strcmp(msg, "forced update")) {
719 *ref = find_ref_by_name(*ref, refname);
721 *ref = find_ref_by_name(remote_refs, refname);
723 warning("helper reported unexpected status of %s", refname);
727 if ((*ref)->status != REF_STATUS_NONE) {
729 * Earlier, the ref was marked not to be pushed, so ignore the ref
730 * status reported by the remote helper if the latter is 'no match'.
732 if (status == REF_STATUS_NONE)
736 (*ref)->status = status;
737 (*ref)->forced_update |= forced;
738 (*ref)->remote_status = msg;
739 return !(status == REF_STATUS_OK);
742 static int push_update_refs_status(struct helper_data *data,
743 struct ref *remote_refs,
746 struct strbuf buf = STRBUF_INIT;
747 struct ref *ref = remote_refs;
753 if (recvline(data, &buf)) {
761 if (push_update_ref_status(&buf, &ref, remote_refs))
764 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
767 /* propagate back the update to the remote namespace */
768 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
771 update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0);
774 strbuf_release(&buf);
778 static int push_refs_with_push(struct transport *transport,
779 struct ref *remote_refs, int flags)
781 int force_all = flags & TRANSPORT_PUSH_FORCE;
782 int mirror = flags & TRANSPORT_PUSH_MIRROR;
783 struct helper_data *data = transport->data;
784 struct strbuf buf = STRBUF_INIT;
786 struct string_list cas_options = STRING_LIST_INIT_DUP;
787 struct string_list_item *cas_option;
789 get_helper(transport);
793 for (ref = remote_refs; ref; ref = ref->next) {
794 if (!ref->peer_ref && !mirror)
797 /* Check for statuses set by set_ref_status_for_push() */
798 switch (ref->status) {
799 case REF_STATUS_REJECT_NONFASTFORWARD:
800 case REF_STATUS_REJECT_STALE:
801 case REF_STATUS_REJECT_ALREADY_EXISTS:
802 case REF_STATUS_UPTODATE:
811 strbuf_addstr(&buf, "push ");
812 if (!ref->deletion) {
814 strbuf_addch(&buf, '+');
816 strbuf_addstr(&buf, ref->peer_ref->name);
818 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
820 strbuf_addch(&buf, ':');
821 strbuf_addstr(&buf, ref->name);
822 strbuf_addch(&buf, '\n');
825 * The "--force-with-lease" options without explicit
826 * values to expect have already been expanded into
827 * the ref->old_sha1_expect[] field; we can ignore
828 * transport->smart_options->cas altogether and instead
829 * can enumerate them from the refs.
831 if (ref->expect_old_sha1) {
832 struct strbuf cas = STRBUF_INIT;
833 strbuf_addf(&cas, "%s:%s",
834 ref->name, sha1_to_hex(ref->old_sha1_expect));
835 string_list_append(&cas_options, strbuf_detach(&cas, NULL));
839 string_list_clear(&cas_options, 0);
843 standard_options(transport);
844 for_each_string_list_item(cas_option, &cas_options)
845 set_helper_option(transport, "cas", cas_option->string);
847 if (flags & TRANSPORT_PUSH_DRY_RUN) {
848 if (set_helper_option(transport, "dry-run", "true") != 0)
849 die("helper %s does not support dry-run", data->name);
852 strbuf_addch(&buf, '\n');
853 sendline(data, &buf);
854 strbuf_release(&buf);
856 return push_update_refs_status(data, remote_refs, flags);
859 static int push_refs_with_export(struct transport *transport,
860 struct ref *remote_refs, int flags)
863 struct child_process *helper, exporter;
864 struct helper_data *data = transport->data;
865 struct string_list revlist_args = STRING_LIST_INIT_NODUP;
866 struct strbuf buf = STRBUF_INIT;
869 die("remote-helper doesn't support push; refspec needed");
871 if (flags & TRANSPORT_PUSH_DRY_RUN) {
872 if (set_helper_option(transport, "dry-run", "true") != 0)
873 die("helper %s does not support dry-run", data->name);
876 if (flags & TRANSPORT_PUSH_FORCE) {
877 if (set_helper_option(transport, "force", "true") != 0)
878 warning("helper %s does not support 'force'", data->name);
881 helper = get_helper(transport);
883 write_constant(helper->in, "export\n");
887 for (ref = remote_refs; ref; ref = ref->next) {
889 unsigned char sha1[20];
892 die("remote-helpers do not support ref deletion");
894 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
895 if (private && !get_sha1(private, sha1)) {
896 strbuf_addf(&buf, "^%s", private);
897 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
898 hashcpy(ref->old_sha1, sha1);
903 if (strcmp(ref->peer_ref->name, ref->name))
904 die("remote-helpers do not support old:new syntax");
905 string_list_append(&revlist_args, ref->peer_ref->name);
909 if (get_exporter(transport, &exporter, &revlist_args))
910 die("Couldn't run fast-export");
912 if (finish_command(&exporter))
913 die("Error while running fast-export");
914 return push_update_refs_status(data, remote_refs, flags);
917 static int push_refs(struct transport *transport,
918 struct ref *remote_refs, int flags)
920 struct helper_data *data = transport->data;
922 if (process_connect(transport, 1)) {
923 do_take_over(transport);
924 return transport->push_refs(transport, remote_refs, flags);
928 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
929 "Perhaps you should specify a branch such as 'master'.\n");
934 return push_refs_with_push(transport, remote_refs, flags);
937 return push_refs_with_export(transport, remote_refs, flags);
943 static int has_attribute(const char *attrs, const char *attr) {
950 const char *space = strchrnul(attrs, ' ');
951 if (len == space - attrs && !strncmp(attrs, attr, len))
959 static struct ref *get_refs_list(struct transport *transport, int for_push)
961 struct helper_data *data = transport->data;
962 struct child_process *helper;
963 struct ref *ret = NULL;
964 struct ref **tail = &ret;
966 struct strbuf buf = STRBUF_INIT;
968 helper = get_helper(transport);
970 if (process_connect(transport, for_push)) {
971 do_take_over(transport);
972 return transport->get_refs_list(transport, for_push);
975 if (data->push && for_push)
976 write_str_in_full(helper->in, "list for-push\n");
978 write_str_in_full(helper->in, "list\n");
982 if (recvline(data, &buf))
988 eov = strchr(buf.buf, ' ');
990 die("Malformed response in ref list: %s", buf.buf);
991 eon = strchr(eov + 1, ' ');
995 *tail = alloc_ref(eov + 1);
996 if (buf.buf[0] == '@')
997 (*tail)->symref = xstrdup(buf.buf + 1);
998 else if (buf.buf[0] != '?')
999 get_sha1_hex(buf.buf, (*tail)->old_sha1);
1001 if (has_attribute(eon + 1, "unchanged")) {
1002 (*tail)->status |= REF_STATUS_UPTODATE;
1003 read_ref((*tail)->name, (*tail)->old_sha1);
1006 tail = &((*tail)->next);
1009 fprintf(stderr, "Debug: Read ref listing.\n");
1010 strbuf_release(&buf);
1012 for (posn = ret; posn; posn = posn->next)
1013 resolve_remote_symref(posn, ret);
1018 int transport_helper_init(struct transport *transport, const char *name)
1020 struct helper_data *data = xcalloc(sizeof(*data), 1);
1023 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1026 transport->data = data;
1027 transport->set_option = set_helper_option;
1028 transport->get_refs_list = get_refs_list;
1029 transport->fetch = fetch;
1030 transport->push_refs = push_refs;
1031 transport->disconnect = release_helper;
1032 transport->connect = connect_helper;
1033 transport->smart_options = &(data->transport_options);
1038 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1039 * buffer less), so attempt reads and writes with up to that size.
1041 #define BUFFERSIZE 65536
1042 /* This should be enough to hold debugging message. */
1043 #define PBUFFERSIZE 8192
1045 /* Print bidirectional transfer loop debug message. */
1046 __attribute__((format (printf, 1, 2)))
1047 static void transfer_debug(const char *fmt, ...)
1050 char msgbuf[PBUFFERSIZE];
1051 static int debug_enabled = -1;
1053 if (debug_enabled < 0)
1054 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1058 va_start(args, fmt);
1059 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1061 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1064 /* Stream state: More data may be coming in this direction. */
1065 #define SSTATE_TRANSFERING 0
1067 * Stream state: No more data coming in this direction, flushing rest of
1070 #define SSTATE_FLUSHING 1
1071 /* Stream state: Transfer in this direction finished. */
1072 #define SSTATE_FINISHED 2
1074 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1075 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1076 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1078 /* Unidirectional transfer. */
1079 struct unidirectional_transfer {
1084 /* Is source socket? */
1086 /* Is destination socket? */
1088 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1091 char buf[BUFFERSIZE];
1094 /* Name of source. */
1095 const char *src_name;
1096 /* Name of destination. */
1097 const char *dest_name;
1100 /* Closes the target (for writing) if transfer has finished. */
1101 static void udt_close_if_finished(struct unidirectional_transfer *t)
1103 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1104 t->state = SSTATE_FINISHED;
1105 if (t->dest_is_sock)
1106 shutdown(t->dest, SHUT_WR);
1109 transfer_debug("Closed %s.", t->dest_name);
1114 * Tries to read read data from source into buffer. If buffer is full,
1115 * no data is read. Returns 0 on success, -1 on error.
1117 static int udt_do_read(struct unidirectional_transfer *t)
1121 if (t->bufuse == BUFFERSIZE)
1122 return 0; /* No space for more. */
1124 transfer_debug("%s is readable", t->src_name);
1125 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1126 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1128 error("read(%s) failed: %s", t->src_name, strerror(errno));
1130 } else if (bytes == 0) {
1131 transfer_debug("%s EOF (with %i bytes in buffer)",
1132 t->src_name, (int)t->bufuse);
1133 t->state = SSTATE_FLUSHING;
1134 } else if (bytes > 0) {
1136 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1137 (int)bytes, t->src_name, (int)t->bufuse);
1142 /* Tries to write data from buffer into destination. If buffer is empty,
1143 * no data is written. Returns 0 on success, -1 on error.
1145 static int udt_do_write(struct unidirectional_transfer *t)
1150 return 0; /* Nothing to write. */
1152 transfer_debug("%s is writable", t->dest_name);
1153 bytes = xwrite(t->dest, t->buf, t->bufuse);
1154 if (bytes < 0 && errno != EWOULDBLOCK) {
1155 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1157 } else if (bytes > 0) {
1160 memmove(t->buf, t->buf + bytes, t->bufuse);
1161 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1162 (int)bytes, t->dest_name, (int)t->bufuse);
1168 /* State of bidirectional transfer loop. */
1169 struct bidirectional_transfer_state {
1170 /* Direction from program to git. */
1171 struct unidirectional_transfer ptg;
1172 /* Direction from git to program. */
1173 struct unidirectional_transfer gtp;
1176 static void *udt_copy_task_routine(void *udt)
1178 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1179 while (t->state != SSTATE_FINISHED) {
1180 if (STATE_NEEDS_READING(t->state))
1183 if (STATE_NEEDS_WRITING(t->state))
1184 if (udt_do_write(t))
1186 if (STATE_NEEDS_CLOSING(t->state))
1187 udt_close_if_finished(t);
1189 return udt; /* Just some non-NULL value. */
1195 * Join thread, with appropriate errors on failure. Name is name for the
1196 * thread (for error messages). Returns 0 on success, 1 on failure.
1198 static int tloop_join(pthread_t thread, const char *name)
1202 err = pthread_join(thread, &tret);
1204 error("%s thread failed", name);
1208 error("%s thread failed to join: %s", name, strerror(err));
1215 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1218 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1220 pthread_t gtp_thread;
1221 pthread_t ptg_thread;
1224 err = pthread_create(>p_thread, NULL, udt_copy_task_routine,
1227 die("Can't start thread for copying data: %s", strerror(err));
1228 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1231 die("Can't start thread for copying data: %s", strerror(err));
1233 ret |= tloop_join(gtp_thread, "Git to program copy");
1234 ret |= tloop_join(ptg_thread, "Program to git copy");
1239 /* Close the source and target (for writing) for transfer. */
1240 static void udt_kill_transfer(struct unidirectional_transfer *t)
1242 t->state = SSTATE_FINISHED;
1244 * Socket read end left open isn't a disaster if nobody
1245 * attempts to read from it (mingw compat headers do not
1248 * We can't fully close the socket since otherwise gtp
1249 * task would first close the socket it sends data to
1250 * while closing the ptg file descriptors.
1252 if (!t->src_is_sock)
1254 if (t->dest_is_sock)
1255 shutdown(t->dest, SHUT_WR);
1261 * Join process, with appropriate errors on failure. Name is name for the
1262 * process (for error messages). Returns 0 on success, 1 on failure.
1264 static int tloop_join(pid_t pid, const char *name)
1267 if (waitpid(pid, &tret, 0) < 0) {
1268 error("%s process failed to wait: %s", name, strerror(errno));
1271 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1272 error("%s process failed", name);
1279 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1282 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1287 /* Fork thread #1: git to program. */
1290 die_errno("Can't start thread for copying data");
1291 else if (pid1 == 0) {
1292 udt_kill_transfer(&s->ptg);
1293 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1296 /* Fork thread #2: program to git. */
1299 die_errno("Can't start thread for copying data");
1300 else if (pid2 == 0) {
1301 udt_kill_transfer(&s->gtp);
1302 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1306 * Close both streams in parent as to not interfere with
1307 * end of file detection and wait for both tasks to finish.
1309 udt_kill_transfer(&s->gtp);
1310 udt_kill_transfer(&s->ptg);
1311 ret |= tloop_join(pid1, "Git to program copy");
1312 ret |= tloop_join(pid2, "Program to git copy");
1318 * Copies data from stdin to output and from input to stdout simultaneously.
1319 * Additionally filtering through given filter. If filter is NULL, uses
1322 int bidirectional_transfer_loop(int input, int output)
1324 struct bidirectional_transfer_state state;
1326 /* Fill the state fields. */
1327 state.ptg.src = input;
1329 state.ptg.src_is_sock = (input == output);
1330 state.ptg.dest_is_sock = 0;
1331 state.ptg.state = SSTATE_TRANSFERING;
1332 state.ptg.bufuse = 0;
1333 state.ptg.src_name = "remote input";
1334 state.ptg.dest_name = "stdout";
1337 state.gtp.dest = output;
1338 state.gtp.src_is_sock = 0;
1339 state.gtp.dest_is_sock = (input == output);
1340 state.gtp.state = SSTATE_TRANSFERING;
1341 state.gtp.bufuse = 0;
1342 state.gtp.src_name = "stdin";
1343 state.gtp.dest_name = "remote output";
1345 return tloop_spawnwait_tasks(&state);