clone: initialize atexit cleanup handler earlier
[git.git] / transport-helper.c
blobb9ba0416b24fb2d53b410b3b97424e9efd552b43
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"
14 #include "refs.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)
49 != buffer->len)
50 die_errno("Full write to remote helper failed");
53 static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
55 strbuf_reset(buffer);
56 if (debug)
57 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
58 if (strbuf_getline(buffer, helper, '\n') == EOF) {
59 if (debug)
60 fprintf(stderr, "Debug: Remote helper quit.\n");
61 return 1;
64 if (debug)
65 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
66 return 0;
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)
76 if (debug)
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)
84 if (url) {
85 const char *colon = strchr(url, ':');
86 if (colon && colon[1] == ':')
87 return colon + 2;
89 return url;
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);
97 fclose(data->out);
98 free(data);
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;
108 int refspec_nr = 0;
109 int refspec_alloc = 0;
110 int duped;
111 int code;
112 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
113 const char *helper_env[] = {
114 git_dir_buf,
115 NULL
119 if (data->helper)
120 return data->helper;
122 helper = xcalloc(1, sizeof(*helper));
123 helper->in = -1;
124 helper->out = -1;
125 helper->err = 0;
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);
130 helper->git_cmd = 0;
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);
139 else if (code != 0)
140 exit(code);
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);
151 if (duped < 0)
152 die_errno("Can't dup helper output fd");
153 data->out = xfdopen(duped, "r");
155 write_constant(helper->in, "capabilities\n");
157 while (1) {
158 const char *capname;
159 int mandatory = 0;
160 if (recvline(data, &buf))
161 exit(128);
163 if (!*buf.buf)
164 break;
166 if (*buf.buf == '*') {
167 capname = buf.buf + 1;
168 mandatory = 1;
169 } else
170 capname = buf.buf;
172 if (debug)
173 fprintf(stderr, "Debug: Got cap %s\n", capname);
174 if (!strcmp(capname, "fetch"))
175 data->fetch = 1;
176 else if (!strcmp(capname, "option"))
177 data->option = 1;
178 else if (!strcmp(capname, "push"))
179 data->push = 1;
180 else if (!strcmp(capname, "import"))
181 data->import = 1;
182 else if (!strcmp(capname, "bidi-import"))
183 data->bidi_import = 1;
184 else if (!strcmp(capname, "export"))
185 data->export = 1;
186 else if (!strcmp(capname, "check-connectivity"))
187 data->check_connectivity = 1;
188 else if (!data->refspecs && starts_with(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 (starts_with(capname, "export-marks ")) {
198 data->export_marks = xstrdup(capname + strlen("export-marks "));
199 } else if (starts_with(capname, "import-marks")) {
200 data->import_marks = xstrdup(capname + strlen("import-marks "));
201 } else if (starts_with(capname, "no-private-update")) {
202 data->no_private_update = 1;
203 } else if (mandatory) {
204 die("Unknown mandatory capability %s. This remote "
205 "helper probably needs newer version of Git.",
206 capname);
209 if (refspecs) {
210 int i;
211 data->refspec_nr = refspec_nr;
212 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
213 for (i = 0; i < refspec_nr; i++)
214 free((char *)refspecs[i]);
215 free(refspecs);
216 } else if (data->import || data->bidi_import || data->export) {
217 warning("This remote helper should implement refspec capability.");
219 strbuf_release(&buf);
220 if (debug)
221 fprintf(stderr, "Debug: Capabilities complete.\n");
222 return data->helper;
225 static int disconnect_helper(struct transport *transport)
227 struct helper_data *data = transport->data;
228 int res = 0;
230 if (data->helper) {
231 if (debug)
232 fprintf(stderr, "Debug: Disconnecting.\n");
233 if (!data->no_disconnect_req) {
235 * Ignore write errors; there's nothing we can do,
236 * since we're about to close the pipe anyway. And the
237 * most likely error is EPIPE due to the helper dying
238 * to report an error itself.
240 sigchain_push(SIGPIPE, SIG_IGN);
241 xwrite(data->helper->in, "\n", 1);
242 sigchain_pop(SIGPIPE);
244 close(data->helper->in);
245 close(data->helper->out);
246 fclose(data->out);
247 res = finish_command(data->helper);
248 argv_array_free_detached(data->helper->argv);
249 free(data->helper);
250 data->helper = NULL;
252 return res;
255 static const char *unsupported_options[] = {
256 TRANS_OPT_UPLOADPACK,
257 TRANS_OPT_RECEIVEPACK,
258 TRANS_OPT_THIN,
259 TRANS_OPT_KEEP
262 static const char *boolean_options[] = {
263 TRANS_OPT_THIN,
264 TRANS_OPT_KEEP,
265 TRANS_OPT_FOLLOWTAGS
268 static int set_helper_option(struct transport *transport,
269 const char *name, const char *value)
271 struct helper_data *data = transport->data;
272 struct strbuf buf = STRBUF_INIT;
273 int i, ret, is_bool = 0;
275 get_helper(transport);
277 if (!data->option)
278 return 1;
280 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
281 if (!strcmp(name, unsupported_options[i]))
282 return 1;
285 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
286 if (!strcmp(name, boolean_options[i])) {
287 is_bool = 1;
288 break;
292 strbuf_addf(&buf, "option %s ", name);
293 if (is_bool)
294 strbuf_addstr(&buf, value ? "true" : "false");
295 else
296 quote_c_style(value, &buf, NULL, 0);
297 strbuf_addch(&buf, '\n');
299 sendline(data, &buf);
300 if (recvline(data, &buf))
301 exit(128);
303 if (!strcmp(buf.buf, "ok"))
304 ret = 0;
305 else if (starts_with(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);
350 if (data->check_connectivity &&
351 data->transport_options.check_self_contained_and_connected)
352 set_helper_option(transport, "check-connectivity", "true");
354 if (transport->cloning)
355 set_helper_option(transport, "cloning", "true");
357 if (data->transport_options.update_shallow)
358 set_helper_option(transport, "update-shallow", "true");
360 for (i = 0; i < nr_heads; i++) {
361 const struct ref *posn = to_fetch[i];
362 if (posn->status & REF_STATUS_UPTODATE)
363 continue;
365 strbuf_addf(&buf, "fetch %s %s\n",
366 sha1_to_hex(posn->old_sha1), posn->name);
369 strbuf_addch(&buf, '\n');
370 sendline(data, &buf);
372 while (1) {
373 if (recvline(data, &buf))
374 exit(128);
376 if (starts_with(buf.buf, "lock ")) {
377 const char *name = buf.buf + 5;
378 if (transport->pack_lockfile)
379 warning("%s also locked %s", data->name, name);
380 else
381 transport->pack_lockfile = xstrdup(name);
383 else if (data->check_connectivity &&
384 data->transport_options.check_self_contained_and_connected &&
385 !strcmp(buf.buf, "connectivity-ok"))
386 data->transport_options.self_contained_and_connected = 1;
387 else if (!buf.len)
388 break;
389 else
390 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
392 strbuf_release(&buf);
393 return 0;
396 static int get_importer(struct transport *transport, struct child_process *fastimport)
398 struct child_process *helper = get_helper(transport);
399 struct helper_data *data = transport->data;
400 struct argv_array argv = ARGV_ARRAY_INIT;
401 int cat_blob_fd, code;
402 memset(fastimport, 0, sizeof(*fastimport));
403 fastimport->in = helper->out;
404 argv_array_push(&argv, "fast-import");
405 argv_array_push(&argv, debug ? "--stats" : "--quiet");
407 if (data->bidi_import) {
408 cat_blob_fd = xdup(helper->in);
409 argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
411 fastimport->argv = argv.argv;
412 fastimport->git_cmd = 1;
414 code = start_command(fastimport);
415 return code;
418 static int get_exporter(struct transport *transport,
419 struct child_process *fastexport,
420 struct string_list *revlist_args)
422 struct helper_data *data = transport->data;
423 struct child_process *helper = get_helper(transport);
424 int argc = 0, i;
425 struct strbuf tmp = STRBUF_INIT;
427 memset(fastexport, 0, sizeof(*fastexport));
429 /* we need to duplicate helper->in because we want to use it after
430 * fastexport is done with it. */
431 fastexport->out = dup(helper->in);
432 fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
433 fastexport->argv[argc++] = "fast-export";
434 fastexport->argv[argc++] = "--use-done-feature";
435 fastexport->argv[argc++] = data->signed_tags ?
436 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
437 if (data->export_marks) {
438 strbuf_addf(&tmp, "--export-marks=%s.tmp", data->export_marks);
439 fastexport->argv[argc++] = strbuf_detach(&tmp, NULL);
441 if (data->import_marks) {
442 strbuf_addf(&tmp, "--import-marks=%s", data->import_marks);
443 fastexport->argv[argc++] = strbuf_detach(&tmp, NULL);
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;
458 int i;
459 struct ref *posn;
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++) {
468 posn = to_fetch[i];
469 if (posn->status & REF_STATUS_UPTODATE)
470 continue;
472 strbuf_addf(&buf, "import %s\n", posn->name);
473 sendline(data, &buf);
474 strbuf_reset(&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
494 * were fetching.
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++) {
506 char *private;
507 posn = to_fetch[i];
508 if (posn->status & REF_STATUS_UPTODATE)
509 continue;
510 if (data->refspecs)
511 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
512 else
513 private = xstrdup(posn->name);
514 if (private) {
515 read_ref(private, posn->old_sha1);
516 free(private);
519 strbuf_release(&buf);
520 return 0;
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;
530 FILE *input;
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
538 * on it.
540 duped = dup(helper->out);
541 if (duped < 0)
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);
552 if (r > 0)
553 warning("Setting remote service path not supported by protocol.");
554 else if (r < 0)
555 warning("Invalid remote service path.");
558 if (data->connect)
559 strbuf_addf(&cmdbuf, "connect %s\n", name);
560 else
561 goto exit;
563 sendline(data, &cmdbuf);
564 if (recvline_fh(input, &cmdbuf, name))
565 exit(128);
567 if (!strcmp(cmdbuf.buf, "")) {
568 data->no_disconnect_req = 1;
569 if (debug)
570 fprintf(stderr, "Debug: Smart transport connection "
571 "ready.\n");
572 ret = 1;
573 } else if (!strcmp(cmdbuf.buf, "fallback")) {
574 if (debug)
575 fprintf(stderr, "Debug: Falling back to dumb "
576 "transport.\n");
577 } else
578 die("Unknown response to connect: %s",
579 cmdbuf.buf);
581 exit:
582 fclose(input);
583 return ret;
586 static int process_connect(struct transport *transport,
587 int for_push)
589 struct helper_data *data = transport->data;
590 const char *name;
591 const char *exec;
593 name = for_push ? "git-receive-pack" : "git-upload-pack";
594 if (for_push)
595 exec = data->transport_options.receivepack;
596 else
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);
609 if (!data->connect)
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;
617 return 0;
620 static int fetch(struct transport *transport,
621 int nr_heads, struct ref **to_fetch)
623 struct helper_data *data = transport->data;
624 int i, count;
626 if (process_connect(transport, 0)) {
627 do_take_over(transport);
628 return transport->fetch(transport, nr_heads, to_fetch);
631 count = 0;
632 for (i = 0; i < nr_heads; i++)
633 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
634 count++;
636 if (!count)
637 return 0;
639 if (data->fetch)
640 return fetch_with_fetch(transport, nr_heads, to_fetch);
642 if (data->import)
643 return fetch_with_import(transport, nr_heads, to_fetch);
645 return -1;
648 static int push_update_ref_status(struct strbuf *buf,
649 struct ref **ref,
650 struct ref *remote_refs)
652 char *refname, *msg;
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;
661 } else
662 die("expected ok/error, helper said '%s'", buf->buf);
664 msg = strchr(refname, ' ');
665 if (msg) {
666 struct strbuf msg_buf = STRBUF_INIT;
667 const char *end;
669 *msg++ = '\0';
670 if (!unquote_c_style(&msg_buf, msg, &end))
671 msg = strbuf_detach(&msg_buf, NULL);
672 else
673 msg = xstrdup(msg);
674 strbuf_release(&msg_buf);
676 if (!strcmp(msg, "no match")) {
677 status = REF_STATUS_NONE;
678 free(msg);
679 msg = NULL;
681 else if (!strcmp(msg, "up to date")) {
682 status = REF_STATUS_UPTODATE;
683 free(msg);
684 msg = NULL;
686 else if (!strcmp(msg, "non-fast forward")) {
687 status = REF_STATUS_REJECT_NONFASTFORWARD;
688 free(msg);
689 msg = NULL;
691 else if (!strcmp(msg, "already exists")) {
692 status = REF_STATUS_REJECT_ALREADY_EXISTS;
693 free(msg);
694 msg = NULL;
696 else if (!strcmp(msg, "fetch first")) {
697 status = REF_STATUS_REJECT_FETCH_FIRST;
698 free(msg);
699 msg = NULL;
701 else if (!strcmp(msg, "needs force")) {
702 status = REF_STATUS_REJECT_NEEDS_FORCE;
703 free(msg);
704 msg = NULL;
706 else if (!strcmp(msg, "stale info")) {
707 status = REF_STATUS_REJECT_STALE;
708 free(msg);
709 msg = NULL;
711 else if (!strcmp(msg, "forced update")) {
712 forced = 1;
713 free(msg);
714 msg = NULL;
718 if (*ref)
719 *ref = find_ref_by_name(*ref, refname);
720 if (!*ref)
721 *ref = find_ref_by_name(remote_refs, refname);
722 if (!*ref) {
723 warning("helper reported unexpected status of %s", refname);
724 return 1;
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)
733 return 1;
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,
744 int flags)
746 struct strbuf buf = STRBUF_INIT;
747 struct ref *ref = remote_refs;
748 int ret = 0;
750 for (;;) {
751 char *private;
753 if (recvline(data, &buf)) {
754 ret = 1;
755 break;
758 if (!buf.len)
759 break;
761 if (push_update_ref_status(&buf, &ref, remote_refs))
762 continue;
764 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
765 continue;
767 /* propagate back the update to the remote namespace */
768 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
769 if (!private)
770 continue;
771 update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0);
772 free(private);
774 strbuf_release(&buf);
775 return ret;
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;
785 struct ref *ref;
786 struct string_list cas_options = STRING_LIST_INIT_DUP;
787 struct string_list_item *cas_option;
789 get_helper(transport);
790 if (!data->push)
791 return 1;
793 for (ref = remote_refs; ref; ref = ref->next) {
794 if (!ref->peer_ref && !mirror)
795 continue;
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:
803 continue;
804 default:
805 ; /* do nothing */
808 if (force_all)
809 ref->force = 1;
811 strbuf_addstr(&buf, "push ");
812 if (!ref->deletion) {
813 if (ref->force)
814 strbuf_addch(&buf, '+');
815 if (ref->peer_ref)
816 strbuf_addstr(&buf, ref->peer_ref->name);
817 else
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));
838 if (buf.len == 0) {
839 string_list_clear(&cas_options, 0);
840 return 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)
862 struct ref *ref;
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;
868 if (!data->refspecs)
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");
885 strbuf_reset(&buf);
887 for (ref = remote_refs; ref; ref = ref->next) {
888 char *private;
889 unsigned char sha1[20];
891 if (ref->deletion)
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);
900 free(private);
902 if (ref->peer_ref) {
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 if (push_update_refs_status(data, remote_refs, flags))
915 return 1;
917 if (data->export_marks) {
918 strbuf_addf(&buf, "%s.tmp", data->export_marks);
919 rename(buf.buf, data->export_marks);
920 strbuf_release(&buf);
923 return 0;
926 static int push_refs(struct transport *transport,
927 struct ref *remote_refs, int flags)
929 struct helper_data *data = transport->data;
931 if (process_connect(transport, 1)) {
932 do_take_over(transport);
933 return transport->push_refs(transport, remote_refs, flags);
936 if (!remote_refs) {
937 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
938 "Perhaps you should specify a branch such as 'master'.\n");
939 return 0;
942 if (data->push)
943 return push_refs_with_push(transport, remote_refs, flags);
945 if (data->export)
946 return push_refs_with_export(transport, remote_refs, flags);
948 return -1;
952 static int has_attribute(const char *attrs, const char *attr) {
953 int len;
954 if (!attrs)
955 return 0;
957 len = strlen(attr);
958 for (;;) {
959 const char *space = strchrnul(attrs, ' ');
960 if (len == space - attrs && !strncmp(attrs, attr, len))
961 return 1;
962 if (!*space)
963 return 0;
964 attrs = space + 1;
968 static struct ref *get_refs_list(struct transport *transport, int for_push)
970 struct helper_data *data = transport->data;
971 struct child_process *helper;
972 struct ref *ret = NULL;
973 struct ref **tail = &ret;
974 struct ref *posn;
975 struct strbuf buf = STRBUF_INIT;
977 helper = get_helper(transport);
979 if (process_connect(transport, for_push)) {
980 do_take_over(transport);
981 return transport->get_refs_list(transport, for_push);
984 if (data->push && for_push)
985 write_str_in_full(helper->in, "list for-push\n");
986 else
987 write_str_in_full(helper->in, "list\n");
989 while (1) {
990 char *eov, *eon;
991 if (recvline(data, &buf))
992 exit(128);
994 if (!*buf.buf)
995 break;
997 eov = strchr(buf.buf, ' ');
998 if (!eov)
999 die("Malformed response in ref list: %s", buf.buf);
1000 eon = strchr(eov + 1, ' ');
1001 *eov = '\0';
1002 if (eon)
1003 *eon = '\0';
1004 *tail = alloc_ref(eov + 1);
1005 if (buf.buf[0] == '@')
1006 (*tail)->symref = xstrdup(buf.buf + 1);
1007 else if (buf.buf[0] != '?')
1008 get_sha1_hex(buf.buf, (*tail)->old_sha1);
1009 if (eon) {
1010 if (has_attribute(eon + 1, "unchanged")) {
1011 (*tail)->status |= REF_STATUS_UPTODATE;
1012 read_ref((*tail)->name, (*tail)->old_sha1);
1015 tail = &((*tail)->next);
1017 if (debug)
1018 fprintf(stderr, "Debug: Read ref listing.\n");
1019 strbuf_release(&buf);
1021 for (posn = ret; posn; posn = posn->next)
1022 resolve_remote_symref(posn, ret);
1024 return ret;
1027 int transport_helper_init(struct transport *transport, const char *name)
1029 struct helper_data *data = xcalloc(1, sizeof(*data));
1030 data->name = name;
1032 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1033 debug = 1;
1035 transport->data = data;
1036 transport->set_option = set_helper_option;
1037 transport->get_refs_list = get_refs_list;
1038 transport->fetch = fetch;
1039 transport->push_refs = push_refs;
1040 transport->disconnect = release_helper;
1041 transport->connect = connect_helper;
1042 transport->smart_options = &(data->transport_options);
1043 return 0;
1047 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1048 * buffer less), so attempt reads and writes with up to that size.
1050 #define BUFFERSIZE 65536
1051 /* This should be enough to hold debugging message. */
1052 #define PBUFFERSIZE 8192
1054 /* Print bidirectional transfer loop debug message. */
1055 __attribute__((format (printf, 1, 2)))
1056 static void transfer_debug(const char *fmt, ...)
1058 va_list args;
1059 char msgbuf[PBUFFERSIZE];
1060 static int debug_enabled = -1;
1062 if (debug_enabled < 0)
1063 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1064 if (!debug_enabled)
1065 return;
1067 va_start(args, fmt);
1068 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1069 va_end(args);
1070 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1073 /* Stream state: More data may be coming in this direction. */
1074 #define SSTATE_TRANSFERING 0
1076 * Stream state: No more data coming in this direction, flushing rest of
1077 * data.
1079 #define SSTATE_FLUSHING 1
1080 /* Stream state: Transfer in this direction finished. */
1081 #define SSTATE_FINISHED 2
1083 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1084 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1085 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1087 /* Unidirectional transfer. */
1088 struct unidirectional_transfer {
1089 /* Source */
1090 int src;
1091 /* Destination */
1092 int dest;
1093 /* Is source socket? */
1094 int src_is_sock;
1095 /* Is destination socket? */
1096 int dest_is_sock;
1097 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1098 int state;
1099 /* Buffer. */
1100 char buf[BUFFERSIZE];
1101 /* Buffer used. */
1102 size_t bufuse;
1103 /* Name of source. */
1104 const char *src_name;
1105 /* Name of destination. */
1106 const char *dest_name;
1109 /* Closes the target (for writing) if transfer has finished. */
1110 static void udt_close_if_finished(struct unidirectional_transfer *t)
1112 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1113 t->state = SSTATE_FINISHED;
1114 if (t->dest_is_sock)
1115 shutdown(t->dest, SHUT_WR);
1116 else
1117 close(t->dest);
1118 transfer_debug("Closed %s.", t->dest_name);
1123 * Tries to read read data from source into buffer. If buffer is full,
1124 * no data is read. Returns 0 on success, -1 on error.
1126 static int udt_do_read(struct unidirectional_transfer *t)
1128 ssize_t bytes;
1130 if (t->bufuse == BUFFERSIZE)
1131 return 0; /* No space for more. */
1133 transfer_debug("%s is readable", t->src_name);
1134 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1135 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1136 errno != EINTR) {
1137 error("read(%s) failed: %s", t->src_name, strerror(errno));
1138 return -1;
1139 } else if (bytes == 0) {
1140 transfer_debug("%s EOF (with %i bytes in buffer)",
1141 t->src_name, (int)t->bufuse);
1142 t->state = SSTATE_FLUSHING;
1143 } else if (bytes > 0) {
1144 t->bufuse += bytes;
1145 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1146 (int)bytes, t->src_name, (int)t->bufuse);
1148 return 0;
1151 /* Tries to write data from buffer into destination. If buffer is empty,
1152 * no data is written. Returns 0 on success, -1 on error.
1154 static int udt_do_write(struct unidirectional_transfer *t)
1156 ssize_t bytes;
1158 if (t->bufuse == 0)
1159 return 0; /* Nothing to write. */
1161 transfer_debug("%s is writable", t->dest_name);
1162 bytes = xwrite(t->dest, t->buf, t->bufuse);
1163 if (bytes < 0 && errno != EWOULDBLOCK) {
1164 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1165 return -1;
1166 } else if (bytes > 0) {
1167 t->bufuse -= bytes;
1168 if (t->bufuse)
1169 memmove(t->buf, t->buf + bytes, t->bufuse);
1170 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1171 (int)bytes, t->dest_name, (int)t->bufuse);
1173 return 0;
1177 /* State of bidirectional transfer loop. */
1178 struct bidirectional_transfer_state {
1179 /* Direction from program to git. */
1180 struct unidirectional_transfer ptg;
1181 /* Direction from git to program. */
1182 struct unidirectional_transfer gtp;
1185 static void *udt_copy_task_routine(void *udt)
1187 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1188 while (t->state != SSTATE_FINISHED) {
1189 if (STATE_NEEDS_READING(t->state))
1190 if (udt_do_read(t))
1191 return NULL;
1192 if (STATE_NEEDS_WRITING(t->state))
1193 if (udt_do_write(t))
1194 return NULL;
1195 if (STATE_NEEDS_CLOSING(t->state))
1196 udt_close_if_finished(t);
1198 return udt; /* Just some non-NULL value. */
1201 #ifndef NO_PTHREADS
1204 * Join thread, with appropriate errors on failure. Name is name for the
1205 * thread (for error messages). Returns 0 on success, 1 on failure.
1207 static int tloop_join(pthread_t thread, const char *name)
1209 int err;
1210 void *tret;
1211 err = pthread_join(thread, &tret);
1212 if (!tret) {
1213 error("%s thread failed", name);
1214 return 1;
1216 if (err) {
1217 error("%s thread failed to join: %s", name, strerror(err));
1218 return 1;
1220 return 0;
1224 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1225 * -1 on failure.
1227 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1229 pthread_t gtp_thread;
1230 pthread_t ptg_thread;
1231 int err;
1232 int ret = 0;
1233 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1234 &s->gtp);
1235 if (err)
1236 die("Can't start thread for copying data: %s", strerror(err));
1237 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1238 &s->ptg);
1239 if (err)
1240 die("Can't start thread for copying data: %s", strerror(err));
1242 ret |= tloop_join(gtp_thread, "Git to program copy");
1243 ret |= tloop_join(ptg_thread, "Program to git copy");
1244 return ret;
1246 #else
1248 /* Close the source and target (for writing) for transfer. */
1249 static void udt_kill_transfer(struct unidirectional_transfer *t)
1251 t->state = SSTATE_FINISHED;
1253 * Socket read end left open isn't a disaster if nobody
1254 * attempts to read from it (mingw compat headers do not
1255 * have SHUT_RD)...
1257 * We can't fully close the socket since otherwise gtp
1258 * task would first close the socket it sends data to
1259 * while closing the ptg file descriptors.
1261 if (!t->src_is_sock)
1262 close(t->src);
1263 if (t->dest_is_sock)
1264 shutdown(t->dest, SHUT_WR);
1265 else
1266 close(t->dest);
1270 * Join process, with appropriate errors on failure. Name is name for the
1271 * process (for error messages). Returns 0 on success, 1 on failure.
1273 static int tloop_join(pid_t pid, const char *name)
1275 int tret;
1276 if (waitpid(pid, &tret, 0) < 0) {
1277 error("%s process failed to wait: %s", name, strerror(errno));
1278 return 1;
1280 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1281 error("%s process failed", name);
1282 return 1;
1284 return 0;
1288 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1289 * -1 on failure.
1291 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1293 pid_t pid1, pid2;
1294 int ret = 0;
1296 /* Fork thread #1: git to program. */
1297 pid1 = fork();
1298 if (pid1 < 0)
1299 die_errno("Can't start thread for copying data");
1300 else if (pid1 == 0) {
1301 udt_kill_transfer(&s->ptg);
1302 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1305 /* Fork thread #2: program to git. */
1306 pid2 = fork();
1307 if (pid2 < 0)
1308 die_errno("Can't start thread for copying data");
1309 else if (pid2 == 0) {
1310 udt_kill_transfer(&s->gtp);
1311 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1315 * Close both streams in parent as to not interfere with
1316 * end of file detection and wait for both tasks to finish.
1318 udt_kill_transfer(&s->gtp);
1319 udt_kill_transfer(&s->ptg);
1320 ret |= tloop_join(pid1, "Git to program copy");
1321 ret |= tloop_join(pid2, "Program to git copy");
1322 return ret;
1324 #endif
1327 * Copies data from stdin to output and from input to stdout simultaneously.
1328 * Additionally filtering through given filter. If filter is NULL, uses
1329 * identity filter.
1331 int bidirectional_transfer_loop(int input, int output)
1333 struct bidirectional_transfer_state state;
1335 /* Fill the state fields. */
1336 state.ptg.src = input;
1337 state.ptg.dest = 1;
1338 state.ptg.src_is_sock = (input == output);
1339 state.ptg.dest_is_sock = 0;
1340 state.ptg.state = SSTATE_TRANSFERING;
1341 state.ptg.bufuse = 0;
1342 state.ptg.src_name = "remote input";
1343 state.ptg.dest_name = "stdout";
1345 state.gtp.src = 0;
1346 state.gtp.dest = output;
1347 state.gtp.src_is_sock = 0;
1348 state.gtp.dest_is_sock = (input == output);
1349 state.gtp.state = SSTATE_TRANSFERING;
1350 state.gtp.bufuse = 0;
1351 state.gtp.src_name = "stdin";
1352 state.gtp.dest_name = "remote output";
1354 return tloop_spawnwait_tasks(&state);