remote-curl: pass ref SHA-1 to fetch-pack as well
[git/git.git] / transport-helper.c
CommitLineData
6eb996b5
DB
1#include "cache.h"
2#include "transport.h"
ae4efe19 3#include "quote.h"
6eb996b5
DB
4#include "run-command.h"
5#include "commit.h"
6#include "diff.h"
7#include "revision.h"
ef08ef9e 8#include "quote.h"
72ff8943 9#include "remote.h"
73b49a75 10#include "string-list.h"
7851b1e6 11#include "thread-utils.h"
c34fe630 12#include "sigchain.h"
bfc366d9 13#include "argv-array.h"
664059fb 14#include "refs.h"
7851b1e6 15
bf3c523c
IL
16static int debug;
17
9cba13ca 18struct helper_data {
6eb996b5
DB
19 const char *name;
20 struct child_process *helper;
292ce46b 21 FILE *out;
ef08ef9e 22 unsigned fetch : 1,
a24a32dd 23 import : 1,
bfc366d9 24 bidi_import : 1,
73b49a75 25 export : 1,
ae4efe19 26 option : 1,
fa8c097c
IL
27 push : 1,
28 connect : 1,
0d957a4d 29 signed_tags : 1,
9ba38048 30 check_connectivity : 1,
597b831a
MM
31 no_disconnect_req : 1,
32 no_private_update : 1;
a515ebe9
SR
33 char *export_marks;
34 char *import_marks;
72ff8943
DB
35 /* These go from remote name (as in "list") to private name */
36 struct refspec *refspecs;
37 int refspec_nr;
61b075bd
IL
38 /* Transport options for fetch-pack/send-pack (should one of
39 * those be invoked).
40 */
41 struct git_transport_options transport_options;
6eb996b5
DB
42};
43
bf3c523c
IL
44static void sendline(struct helper_data *helper, struct strbuf *buffer)
45{
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");
51}
52
c096955c 53static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
bf3c523c
IL
54{
55 strbuf_reset(buffer);
56 if (debug)
57 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
fa8c097c 58 if (strbuf_getline(buffer, helper, '\n') == EOF) {
bf3c523c
IL
59 if (debug)
60 fprintf(stderr, "Debug: Remote helper quit.\n");
266f1fdf 61 exit(128);
bf3c523c
IL
62 }
63
64 if (debug)
65 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
66 return 0;
67}
68
fa8c097c
IL
69static int recvline(struct helper_data *helper, struct strbuf *buffer)
70{
c096955c 71 return recvline_fh(helper->out, buffer, helper->name);
fa8c097c
IL
72}
73
bf3c523c
IL
74static void xchgline(struct helper_data *helper, struct strbuf *buffer)
75{
76 sendline(helper, buffer);
77 recvline(helper, buffer);
78}
79
80static void write_constant(int fd, const char *str)
81{
82 if (debug)
83 fprintf(stderr, "Debug: Remote helper: -> %s", str);
84 if (write_in_full(fd, str, strlen(str)) != strlen(str))
85 die_errno("Full write to remote helper failed");
86}
87
c2e86add 88static const char *remove_ext_force(const char *url)
25d5cc48
IL
89{
90 if (url) {
91 const char *colon = strchr(url, ':');
92 if (colon && colon[1] == ':')
93 return colon + 2;
94 }
95 return url;
96}
97
fa8c097c
IL
98static void do_take_over(struct transport *transport)
99{
100 struct helper_data *data;
101 data = (struct helper_data *)transport->data;
102 transport_take_over(transport, data->helper);
103 fclose(data->out);
104 free(data);
105}
106
6eb996b5
DB
107static struct child_process *get_helper(struct transport *transport)
108{
109 struct helper_data *data = transport->data;
bfc366d9 110 struct argv_array argv = ARGV_ARRAY_INIT;
6eb996b5
DB
111 struct strbuf buf = STRBUF_INIT;
112 struct child_process *helper;
72ff8943
DB
113 const char **refspecs = NULL;
114 int refspec_nr = 0;
115 int refspec_alloc = 0;
61b075bd 116 int duped;
6b02de3b 117 int code;
e1735872
DI
118 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
119 const char *helper_env[] = {
120 git_dir_buf,
121 NULL
122 };
123
6eb996b5
DB
124
125 if (data->helper)
126 return data->helper;
127
128 helper = xcalloc(1, sizeof(*helper));
129 helper->in = -1;
130 helper->out = -1;
131 helper->err = 0;
bfc366d9
FA
132 argv_array_pushf(&argv, "git-remote-%s", data->name);
133 argv_array_push(&argv, transport->remote->name);
134 argv_array_push(&argv, remove_ext_force(transport->url));
135 helper->argv = argv_array_detach(&argv, NULL);
6b02de3b
IL
136 helper->git_cmd = 0;
137 helper->silent_exec_failure = 1;
e1735872
DI
138
139 snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
140 helper->env = helper_env;
141
6b02de3b
IL
142 code = start_command(helper);
143 if (code < 0 && errno == ENOENT)
144 die("Unable to find remote helper for '%s'", data->name);
145 else if (code != 0)
146 exit(code);
147
6eb996b5 148 data->helper = helper;
fa8c097c 149 data->no_disconnect_req = 0;
6eb996b5 150
61b075bd
IL
151 /*
152 * Open the output as FILE* so strbuf_getline() can be used.
153 * Do this with duped fd because fclose() will close the fd,
154 * and stuff like taking over will require the fd to remain.
61b075bd
IL
155 */
156 duped = dup(helper->out);
157 if (duped < 0)
158 die_errno("Can't dup helper output fd");
159 data->out = xfdopen(duped, "r");
160
bf3c523c 161 write_constant(helper->in, "capabilities\n");
2d14d65c 162
6eb996b5 163 while (1) {
28ed5b35
IL
164 const char *capname;
165 int mandatory = 0;
bf3c523c 166 recvline(data, &buf);
6eb996b5
DB
167
168 if (!*buf.buf)
169 break;
28ed5b35
IL
170
171 if (*buf.buf == '*') {
172 capname = buf.buf + 1;
173 mandatory = 1;
174 } else
175 capname = buf.buf;
176
bf3c523c 177 if (debug)
28ed5b35
IL
178 fprintf(stderr, "Debug: Got cap %s\n", capname);
179 if (!strcmp(capname, "fetch"))
6eb996b5 180 data->fetch = 1;
28ed5b35 181 else if (!strcmp(capname, "option"))
ef08ef9e 182 data->option = 1;
28ed5b35 183 else if (!strcmp(capname, "push"))
ae4efe19 184 data->push = 1;
28ed5b35 185 else if (!strcmp(capname, "import"))
e65e91ed 186 data->import = 1;
bfc366d9
FA
187 else if (!strcmp(capname, "bidi-import"))
188 data->bidi_import = 1;
73b49a75
SR
189 else if (!strcmp(capname, "export"))
190 data->export = 1;
9ba38048
NTND
191 else if (!strcmp(capname, "check-connectivity"))
192 data->check_connectivity = 1;
28ed5b35 193 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
72ff8943
DB
194 ALLOC_GROW(refspecs,
195 refspec_nr + 1,
196 refspec_alloc);
c28cce55 197 refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec "));
fa8c097c
IL
198 } else if (!strcmp(capname, "connect")) {
199 data->connect = 1;
0d957a4d
JK
200 } else if (!strcmp(capname, "signed-tags")) {
201 data->signed_tags = 1;
a515ebe9
SR
202 } else if (!prefixcmp(capname, "export-marks ")) {
203 struct strbuf arg = STRBUF_INIT;
204 strbuf_addstr(&arg, "--export-marks=");
205 strbuf_addstr(&arg, capname + strlen("export-marks "));
206 data->export_marks = strbuf_detach(&arg, NULL);
207 } else if (!prefixcmp(capname, "import-marks")) {
208 struct strbuf arg = STRBUF_INIT;
209 strbuf_addstr(&arg, "--import-marks=");
210 strbuf_addstr(&arg, capname + strlen("import-marks "));
211 data->import_marks = strbuf_detach(&arg, NULL);
597b831a
MM
212 } else if (!prefixcmp(capname, "no-private-update")) {
213 data->no_private_update = 1;
28ed5b35 214 } else if (mandatory) {
9517e6b8 215 die("Unknown mandatory capability %s. This remote "
82247e9b 216 "helper probably needs newer version of Git.",
28ed5b35 217 capname);
72ff8943
DB
218 }
219 }
220 if (refspecs) {
221 int i;
222 data->refspec_nr = refspec_nr;
223 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
b120ef3e 224 for (i = 0; i < refspec_nr; i++)
72ff8943 225 free((char *)refspecs[i]);
72ff8943 226 free(refspecs);
a93b4a09
FC
227 } else if (data->import || data->bidi_import || data->export) {
228 warning("This remote helper should implement refspec capability.");
6eb996b5 229 }
b962dbdc 230 strbuf_release(&buf);
bf3c523c
IL
231 if (debug)
232 fprintf(stderr, "Debug: Capabilities complete.\n");
6eb996b5
DB
233 return data->helper;
234}
235
236static int disconnect_helper(struct transport *transport)
237{
238 struct helper_data *data = transport->data;
cc567322 239 int res = 0;
bf3c523c 240
6eb996b5 241 if (data->helper) {
bf3c523c
IL
242 if (debug)
243 fprintf(stderr, "Debug: Disconnecting.\n");
fa8c097c 244 if (!data->no_disconnect_req) {
c34fe630
JK
245 /*
246 * Ignore write errors; there's nothing we can do,
247 * since we're about to close the pipe anyway. And the
248 * most likely error is EPIPE due to the helper dying
249 * to report an error itself.
250 */
251 sigchain_push(SIGPIPE, SIG_IGN);
252 xwrite(data->helper->in, "\n", 1);
253 sigchain_pop(SIGPIPE);
fa8c097c 254 }
6eb996b5 255 close(data->helper->in);
61b075bd 256 close(data->helper->out);
292ce46b 257 fclose(data->out);
cc567322 258 res = finish_command(data->helper);
bfc366d9 259 argv_array_free_detached(data->helper->argv);
6eb996b5
DB
260 free(data->helper);
261 data->helper = NULL;
262 }
cc567322 263 return res;
6eb996b5
DB
264}
265
ef08ef9e
SP
266static const char *unsupported_options[] = {
267 TRANS_OPT_UPLOADPACK,
268 TRANS_OPT_RECEIVEPACK,
269 TRANS_OPT_THIN,
270 TRANS_OPT_KEEP
271 };
23cd01ec 272
ef08ef9e
SP
273static const char *boolean_options[] = {
274 TRANS_OPT_THIN,
275 TRANS_OPT_KEEP,
276 TRANS_OPT_FOLLOWTAGS
277 };
278
279static int set_helper_option(struct transport *transport,
280 const char *name, const char *value)
281{
282 struct helper_data *data = transport->data;
ef08ef9e
SP
283 struct strbuf buf = STRBUF_INIT;
284 int i, ret, is_bool = 0;
285
bf3c523c
IL
286 get_helper(transport);
287
ef08ef9e
SP
288 if (!data->option)
289 return 1;
290
291 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
292 if (!strcmp(name, unsupported_options[i]))
293 return 1;
294 }
295
296 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
297 if (!strcmp(name, boolean_options[i])) {
298 is_bool = 1;
299 break;
300 }
301 }
302
303 strbuf_addf(&buf, "option %s ", name);
304 if (is_bool)
305 strbuf_addstr(&buf, value ? "true" : "false");
306 else
307 quote_c_style(value, &buf, NULL, 0);
308 strbuf_addch(&buf, '\n');
309
bf3c523c 310 xchgline(data, &buf);
ef08ef9e
SP
311
312 if (!strcmp(buf.buf, "ok"))
313 ret = 0;
314 else if (!prefixcmp(buf.buf, "error")) {
315 ret = -1;
316 } else if (!strcmp(buf.buf, "unsupported"))
317 ret = 1;
318 else {
319 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
320 ret = 1;
321 }
322 strbuf_release(&buf);
323 return ret;
324}
325
326static void standard_options(struct transport *t)
327{
328 char buf[16];
329 int n;
330 int v = t->verbose;
ef08ef9e 331
d01b3c02 332 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e
SP
333
334 n = snprintf(buf, sizeof(buf), "%d", v + 1);
335 if (n >= sizeof(buf))
336 die("impossibly large verbosity value");
337 set_helper_option(t, "verbosity", buf);
338}
339
f2a37151
DB
340static int release_helper(struct transport *transport)
341{
cc567322 342 int res = 0;
72ff8943
DB
343 struct helper_data *data = transport->data;
344 free_refspec(data->refspec_nr, data->refspecs);
345 data->refspecs = NULL;
cc567322 346 res = disconnect_helper(transport);
f2a37151 347 free(transport->data);
cc567322 348 return res;
f2a37151
DB
349}
350
6eb996b5 351static int fetch_with_fetch(struct transport *transport,
37148311 352 int nr_heads, struct ref **to_fetch)
6eb996b5 353{
292ce46b 354 struct helper_data *data = transport->data;
6eb996b5
DB
355 int i;
356 struct strbuf buf = STRBUF_INIT;
357
ef08ef9e 358 standard_options(transport);
9ba38048
NTND
359 if (data->check_connectivity &&
360 data->transport_options.check_self_contained_and_connected)
361 set_helper_option(transport, "check-connectivity", "true");
ef08ef9e 362
6eb996b5 363 for (i = 0; i < nr_heads; i++) {
1088261f 364 const struct ref *posn = to_fetch[i];
6eb996b5
DB
365 if (posn->status & REF_STATUS_UPTODATE)
366 continue;
2d14d65c
DB
367
368 strbuf_addf(&buf, "fetch %s %s\n",
369 sha1_to_hex(posn->old_sha1), posn->name);
292ce46b 370 }
2d14d65c 371
292ce46b 372 strbuf_addch(&buf, '\n');
bf3c523c 373 sendline(data, &buf);
292ce46b
SP
374
375 while (1) {
bf3c523c 376 recvline(data, &buf);
292ce46b
SP
377
378 if (!prefixcmp(buf.buf, "lock ")) {
379 const char *name = buf.buf + 5;
380 if (transport->pack_lockfile)
381 warning("%s also locked %s", data->name, name);
382 else
383 transport->pack_lockfile = xstrdup(name);
384 }
9ba38048
NTND
385 else if (data->check_connectivity &&
386 data->transport_options.check_self_contained_and_connected &&
387 !strcmp(buf.buf, "connectivity-ok"))
388 data->transport_options.self_contained_and_connected = 1;
292ce46b
SP
389 else if (!buf.len)
390 break;
391 else
392 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 393 }
292ce46b 394 strbuf_release(&buf);
6eb996b5
DB
395 return 0;
396}
397
e65e91ed
DB
398static int get_importer(struct transport *transport, struct child_process *fastimport)
399{
400 struct child_process *helper = get_helper(transport);
bfc366d9
FA
401 struct helper_data *data = transport->data;
402 struct argv_array argv = ARGV_ARRAY_INIT;
403 int cat_blob_fd, code;
e65e91ed
DB
404 memset(fastimport, 0, sizeof(*fastimport));
405 fastimport->in = helper->out;
bfc366d9 406 argv_array_push(&argv, "fast-import");
19ba02af 407 argv_array_push(&argv, debug ? "--stats" : "--quiet");
e65e91ed 408
bfc366d9
FA
409 if (data->bidi_import) {
410 cat_blob_fd = xdup(helper->in);
411 argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
412 }
413 fastimport->argv = argv.argv;
e65e91ed 414 fastimport->git_cmd = 1;
bfc366d9
FA
415
416 code = start_command(fastimport);
417 return code;
e65e91ed
DB
418}
419
73b49a75
SR
420static int get_exporter(struct transport *transport,
421 struct child_process *fastexport,
73b49a75
SR
422 struct string_list *revlist_args)
423{
a515ebe9 424 struct helper_data *data = transport->data;
73b49a75
SR
425 struct child_process *helper = get_helper(transport);
426 int argc = 0, i;
427 memset(fastexport, 0, sizeof(*fastexport));
428
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);
b8bd826f 432 fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
73b49a75 433 fastexport->argv[argc++] = "fast-export";
1f25c504 434 fastexport->argv[argc++] = "--use-done-feature";
0d957a4d
JK
435 fastexport->argv[argc++] = data->signed_tags ?
436 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
a515ebe9
SR
437 if (data->export_marks)
438 fastexport->argv[argc++] = data->export_marks;
439 if (data->import_marks)
440 fastexport->argv[argc++] = data->import_marks;
73b49a75
SR
441
442 for (i = 0; i < revlist_args->nr; i++)
443 fastexport->argv[argc++] = revlist_args->items[i].string;
444
445 fastexport->git_cmd = 1;
446 return start_command(fastexport);
447}
448
e65e91ed
DB
449static int fetch_with_import(struct transport *transport,
450 int nr_heads, struct ref **to_fetch)
451{
452 struct child_process fastimport;
72ff8943 453 struct helper_data *data = transport->data;
e65e91ed
DB
454 int i;
455 struct ref *posn;
456 struct strbuf buf = STRBUF_INIT;
457
bf3c523c
IL
458 get_helper(transport);
459
e65e91ed
DB
460 if (get_importer(transport, &fastimport))
461 die("Couldn't run fast-import");
462
463 for (i = 0; i < nr_heads; i++) {
464 posn = to_fetch[i];
465 if (posn->status & REF_STATUS_UPTODATE)
466 continue;
467
468 strbuf_addf(&buf, "import %s\n", posn->name);
bf3c523c 469 sendline(data, &buf);
e65e91ed
DB
470 strbuf_reset(&buf);
471 }
9504bc9d
SR
472
473 write_constant(data->helper->in, "\n");
bfc366d9
FA
474 /*
475 * remote-helpers that advertise the bidi-import capability are required to
476 * buffer the complete batch of import commands until this newline before
477 * sending data to fast-import.
478 * These helpers read back data from fast-import on their stdin, which could
479 * be mixed with import commands, otherwise.
480 */
9504bc9d 481
cc567322
SR
482 if (finish_command(&fastimport))
483 die("Error while running fast-import");
bfc366d9 484 argv_array_free_detached(fastimport.argv);
e65e91ed 485
dff9d65d
FA
486 /*
487 * The fast-import stream of a remote helper that advertises
488 * the "refspec" capability writes to the refs named after the
489 * right hand side of the first refspec matching each ref we
490 * were fetching.
491 *
492 * (If no "refspec" capability was specified, for historical
7a43c554 493 * reasons we default to the equivalent of *:*.)
dff9d65d
FA
494 *
495 * Store the result in to_fetch[i].old_sha1. Callers such
496 * as "git fetch" can use the value to write feedback to the
497 * terminal, populate FETCH_HEAD, and determine what new value
498 * should be written to peer_ref if the update is a
499 * fast-forward or this is a forced update.
500 */
e65e91ed 501 for (i = 0; i < nr_heads; i++) {
72ff8943 502 char *private;
e65e91ed
DB
503 posn = to_fetch[i];
504 if (posn->status & REF_STATUS_UPTODATE)
505 continue;
72ff8943
DB
506 if (data->refspecs)
507 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
508 else
c28cce55 509 private = xstrdup(posn->name);
d51b720f
MH
510 if (private) {
511 read_ref(private, posn->old_sha1);
512 free(private);
513 }
e65e91ed 514 }
b962dbdc 515 strbuf_release(&buf);
e65e91ed
DB
516 return 0;
517}
518
fa8c097c
IL
519static int process_connect_service(struct transport *transport,
520 const char *name, const char *exec)
521{
522 struct helper_data *data = transport->data;
523 struct strbuf cmdbuf = STRBUF_INIT;
524 struct child_process *helper;
525 int r, duped, ret = 0;
526 FILE *input;
527
528 helper = get_helper(transport);
529
530 /*
531 * Yes, dup the pipe another time, as we need unbuffered version
532 * of input pipe as FILE*. fclose() closes the underlying fd and
533 * stream buffering only can be changed before first I/O operation
534 * on it.
535 */
536 duped = dup(helper->out);
537 if (duped < 0)
538 die_errno("Can't dup helper output fd");
539 input = xfdopen(duped, "r");
540 setvbuf(input, NULL, _IONBF, 0);
541
542 /*
543 * Handle --upload-pack and friends. This is fire and forget...
544 * just warn if it fails.
545 */
546 if (strcmp(name, exec)) {
547 r = set_helper_option(transport, "servpath", exec);
548 if (r > 0)
549 warning("Setting remote service path not supported by protocol.");
550 else if (r < 0)
551 warning("Invalid remote service path.");
552 }
553
554 if (data->connect)
555 strbuf_addf(&cmdbuf, "connect %s\n", name);
556 else
557 goto exit;
558
559 sendline(data, &cmdbuf);
c096955c 560 recvline_fh(input, &cmdbuf, name);
fa8c097c
IL
561 if (!strcmp(cmdbuf.buf, "")) {
562 data->no_disconnect_req = 1;
563 if (debug)
564 fprintf(stderr, "Debug: Smart transport connection "
565 "ready.\n");
566 ret = 1;
567 } else if (!strcmp(cmdbuf.buf, "fallback")) {
568 if (debug)
569 fprintf(stderr, "Debug: Falling back to dumb "
570 "transport.\n");
571 } else
572 die("Unknown response to connect: %s",
573 cmdbuf.buf);
574
575exit:
576 fclose(input);
577 return ret;
578}
579
580static int process_connect(struct transport *transport,
581 int for_push)
582{
583 struct helper_data *data = transport->data;
584 const char *name;
585 const char *exec;
586
587 name = for_push ? "git-receive-pack" : "git-upload-pack";
588 if (for_push)
589 exec = data->transport_options.receivepack;
590 else
591 exec = data->transport_options.uploadpack;
592
593 return process_connect_service(transport, name, exec);
594}
595
b236752a
IL
596static int connect_helper(struct transport *transport, const char *name,
597 const char *exec, int fd[2])
598{
599 struct helper_data *data = transport->data;
600
601 /* Get_helper so connect is inited. */
602 get_helper(transport);
603 if (!data->connect)
604 die("Operation not supported by protocol.");
605
606 if (!process_connect_service(transport, name, exec))
607 die("Can't connect to subservice %s.", name);
608
609 fd[0] = data->helper->out;
610 fd[1] = data->helper->in;
611 return 0;
612}
613
6eb996b5 614static int fetch(struct transport *transport,
37148311 615 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
616{
617 struct helper_data *data = transport->data;
618 int i, count;
619
fa8c097c
IL
620 if (process_connect(transport, 0)) {
621 do_take_over(transport);
622 return transport->fetch(transport, nr_heads, to_fetch);
623 }
624
6eb996b5
DB
625 count = 0;
626 for (i = 0; i < nr_heads; i++)
627 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
628 count++;
629
630 if (!count)
631 return 0;
632
633 if (data->fetch)
634 return fetch_with_fetch(transport, nr_heads, to_fetch);
635
e65e91ed
DB
636 if (data->import)
637 return fetch_with_import(transport, nr_heads, to_fetch);
638
6eb996b5
DB
639 return -1;
640}
641
664059fb 642static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
643 struct ref **ref,
644 struct ref *remote_refs)
645{
646 char *refname, *msg;
647 int status;
648
649 if (!prefixcmp(buf->buf, "ok ")) {
650 status = REF_STATUS_OK;
651 refname = buf->buf + 3;
652 } else if (!prefixcmp(buf->buf, "error ")) {
653 status = REF_STATUS_REMOTE_REJECT;
654 refname = buf->buf + 6;
655 } else
82247e9b 656 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
657
658 msg = strchr(refname, ' ');
659 if (msg) {
660 struct strbuf msg_buf = STRBUF_INIT;
661 const char *end;
662
663 *msg++ = '\0';
664 if (!unquote_c_style(&msg_buf, msg, &end))
665 msg = strbuf_detach(&msg_buf, NULL);
666 else
667 msg = xstrdup(msg);
668 strbuf_release(&msg_buf);
669
670 if (!strcmp(msg, "no match")) {
671 status = REF_STATUS_NONE;
672 free(msg);
673 msg = NULL;
674 }
675 else if (!strcmp(msg, "up to date")) {
676 status = REF_STATUS_UPTODATE;
677 free(msg);
678 msg = NULL;
679 }
680 else if (!strcmp(msg, "non-fast forward")) {
681 status = REF_STATUS_REJECT_NONFASTFORWARD;
682 free(msg);
683 msg = NULL;
684 }
dbfeddb1
CR
685 else if (!strcmp(msg, "already exists")) {
686 status = REF_STATUS_REJECT_ALREADY_EXISTS;
687 free(msg);
688 msg = NULL;
689 }
75e5c0dc
JH
690 else if (!strcmp(msg, "fetch first")) {
691 status = REF_STATUS_REJECT_FETCH_FIRST;
692 free(msg);
693 msg = NULL;
694 }
695 else if (!strcmp(msg, "needs force")) {
696 status = REF_STATUS_REJECT_NEEDS_FORCE;
697 free(msg);
698 msg = NULL;
699 }
631b5ef2
JH
700 else if (!strcmp(msg, "stale info")) {
701 status = REF_STATUS_REJECT_STALE;
702 free(msg);
703 msg = NULL;
704 }
d2e73c6f
SR
705 }
706
707 if (*ref)
708 *ref = find_ref_by_name(*ref, refname);
709 if (!*ref)
710 *ref = find_ref_by_name(remote_refs, refname);
711 if (!*ref) {
712 warning("helper reported unexpected status of %s", refname);
664059fb 713 return 1;
d2e73c6f
SR
714 }
715
716 if ((*ref)->status != REF_STATUS_NONE) {
717 /*
718 * Earlier, the ref was marked not to be pushed, so ignore the ref
719 * status reported by the remote helper if the latter is 'no match'.
720 */
721 if (status == REF_STATUS_NONE)
664059fb 722 return 1;
d2e73c6f
SR
723 }
724
725 (*ref)->status = status;
726 (*ref)->remote_status = msg;
126aac5c 727 return !(status == REF_STATUS_OK);
d2e73c6f
SR
728}
729
730static void push_update_refs_status(struct helper_data *data,
731 struct ref *remote_refs)
732{
733 struct strbuf buf = STRBUF_INIT;
734 struct ref *ref = remote_refs;
735 for (;;) {
664059fb
FC
736 char *private;
737
d2e73c6f
SR
738 recvline(data, &buf);
739 if (!buf.len)
740 break;
741
664059fb
FC
742 if (push_update_ref_status(&buf, &ref, remote_refs))
743 continue;
744
597b831a 745 if (!data->refspecs || data->no_private_update)
664059fb
FC
746 continue;
747
748 /* propagate back the update to the remote namespace */
749 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
750 if (!private)
751 continue;
752 update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0);
753 free(private);
d2e73c6f
SR
754 }
755 strbuf_release(&buf);
756}
757
73b49a75 758static int push_refs_with_push(struct transport *transport,
05c1eb10 759 struct ref *remote_refs, int flags)
ae4efe19
SP
760{
761 int force_all = flags & TRANSPORT_PUSH_FORCE;
762 int mirror = flags & TRANSPORT_PUSH_MIRROR;
763 struct helper_data *data = transport->data;
764 struct strbuf buf = STRBUF_INIT;
ae4efe19 765 struct ref *ref;
05c1eb10
JH
766 struct string_list cas_options = STRING_LIST_INIT_DUP;
767 struct string_list_item *cas_option;
ae4efe19 768
c0aa335c 769 get_helper(transport);
ae4efe19
SP
770 if (!data->push)
771 return 1;
772
773 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 774 if (!ref->peer_ref && !mirror)
ae4efe19
SP
775 continue;
776
20e8b465
TRC
777 /* Check for statuses set by set_ref_status_for_push() */
778 switch (ref->status) {
779 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 780 case REF_STATUS_REJECT_STALE:
dbfeddb1 781 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 782 case REF_STATUS_UPTODATE:
ae4efe19 783 continue;
20e8b465
TRC
784 default:
785 ; /* do nothing */
ae4efe19
SP
786 }
787
788 if (force_all)
789 ref->force = 1;
790
791 strbuf_addstr(&buf, "push ");
792 if (!ref->deletion) {
793 if (ref->force)
794 strbuf_addch(&buf, '+');
795 if (ref->peer_ref)
796 strbuf_addstr(&buf, ref->peer_ref->name);
797 else
798 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
799 }
800 strbuf_addch(&buf, ':');
801 strbuf_addstr(&buf, ref->name);
802 strbuf_addch(&buf, '\n');
05c1eb10
JH
803
804 /*
805 * The "--force-with-lease" options without explicit
806 * values to expect have already been expanded into
807 * the ref->old_sha1_expect[] field; we can ignore
808 * transport->smart_options->cas altogether and instead
809 * can enumerate them from the refs.
810 */
811 if (ref->expect_old_sha1) {
812 struct strbuf cas = STRBUF_INIT;
813 strbuf_addf(&cas, "%s:%s",
814 ref->name, sha1_to_hex(ref->old_sha1_expect));
815 string_list_append(&cas_options, strbuf_detach(&cas, NULL));
816 }
ae4efe19 817 }
05c1eb10
JH
818 if (buf.len == 0) {
819 string_list_clear(&cas_options, 0);
d8f67d20 820 return 0;
05c1eb10 821 }
ae4efe19 822
ae4efe19 823 standard_options(transport);
05c1eb10
JH
824 for_each_string_list_item(cas_option, &cas_options)
825 set_helper_option(transport, "cas", cas_option->string);
ae4efe19
SP
826
827 if (flags & TRANSPORT_PUSH_DRY_RUN) {
828 if (set_helper_option(transport, "dry-run", "true") != 0)
829 die("helper %s does not support dry-run", data->name);
830 }
831
832 strbuf_addch(&buf, '\n');
bf3c523c 833 sendline(data, &buf);
ae4efe19 834 strbuf_release(&buf);
d2e73c6f
SR
835
836 push_update_refs_status(data, remote_refs);
ae4efe19
SP
837 return 0;
838}
839
73b49a75
SR
840static int push_refs_with_export(struct transport *transport,
841 struct ref *remote_refs, int flags)
842{
843 struct ref *ref;
844 struct child_process *helper, exporter;
845 struct helper_data *data = transport->data;
183113a5 846 struct string_list revlist_args = STRING_LIST_INIT_NODUP;
73b49a75
SR
847 struct strbuf buf = STRBUF_INIT;
848
21610d82
FC
849 if (!data->refspecs)
850 die("remote-helper doesn't support push; refspec needed");
851
21457f57
FC
852 if (flags & TRANSPORT_PUSH_DRY_RUN) {
853 if (set_helper_option(transport, "dry-run", "true") != 0)
854 die("helper %s does not support dry-run", data->name);
855 }
856
73b49a75
SR
857 helper = get_helper(transport);
858
859 write_constant(helper->in, "export\n");
860
73b49a75
SR
861 strbuf_reset(&buf);
862
863 for (ref = remote_refs; ref; ref = ref->next) {
864 char *private;
865 unsigned char sha1[20];
866
9c51558c
FC
867 if (ref->deletion)
868 die("remote-helpers do not support ref deletion");
869
73b49a75
SR
870 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
871 if (private && !get_sha1(private, sha1)) {
872 strbuf_addf(&buf, "^%s", private);
1d2f80fa 873 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
b056620f 874 hashcpy(ref->old_sha1, sha1);
73b49a75 875 }
2faa1527 876 free(private);
73b49a75 877
99d9ec09 878 if (ref->deletion)
105fe3e4 879 die("remote-helpers do not support ref deletion");
105fe3e4 880
67c9c782
FC
881 if (ref->peer_ref) {
882 if (strcmp(ref->peer_ref->name, ref->name))
883 die("remote-helpers do not support old:new syntax");
3ea7d094 884 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 885 }
73b49a75
SR
886 }
887
a515ebe9 888 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
889 die("Couldn't run fast-export");
890
cc567322
SR
891 if (finish_command(&exporter))
892 die("Error while running fast-export");
6c8151a3 893 push_update_refs_status(data, remote_refs);
73b49a75
SR
894 return 0;
895}
896
897static int push_refs(struct transport *transport,
898 struct ref *remote_refs, int flags)
899{
900 struct helper_data *data = transport->data;
901
902 if (process_connect(transport, 1)) {
903 do_take_over(transport);
904 return transport->push_refs(transport, remote_refs, flags);
905 }
906
907 if (!remote_refs) {
908 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
909 "Perhaps you should specify a branch such as 'master'.\n");
910 return 0;
911 }
912
913 if (data->push)
914 return push_refs_with_push(transport, remote_refs, flags);
915
916 if (data->export)
917 return push_refs_with_export(transport, remote_refs, flags);
918
919 return -1;
920}
921
922
f8ec9167
DB
923static int has_attribute(const char *attrs, const char *attr) {
924 int len;
925 if (!attrs)
926 return 0;
927
928 len = strlen(attr);
929 for (;;) {
930 const char *space = strchrnul(attrs, ' ');
931 if (len == space - attrs && !strncmp(attrs, attr, len))
932 return 1;
933 if (!*space)
934 return 0;
935 attrs = space + 1;
936 }
937}
938
6eb996b5
DB
939static struct ref *get_refs_list(struct transport *transport, int for_push)
940{
292ce46b 941 struct helper_data *data = transport->data;
6eb996b5
DB
942 struct child_process *helper;
943 struct ref *ret = NULL;
944 struct ref **tail = &ret;
945 struct ref *posn;
946 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
947
948 helper = get_helper(transport);
2d14d65c 949
fa8c097c
IL
950 if (process_connect(transport, for_push)) {
951 do_take_over(transport);
952 return transport->get_refs_list(transport, for_push);
953 }
954
ae4efe19
SP
955 if (data->push && for_push)
956 write_str_in_full(helper->in, "list for-push\n");
957 else
958 write_str_in_full(helper->in, "list\n");
6eb996b5 959
6eb996b5
DB
960 while (1) {
961 char *eov, *eon;
bf3c523c 962 recvline(data, &buf);
6eb996b5
DB
963
964 if (!*buf.buf)
965 break;
966
967 eov = strchr(buf.buf, ' ');
968 if (!eov)
969 die("Malformed response in ref list: %s", buf.buf);
970 eon = strchr(eov + 1, ' ');
971 *eov = '\0';
972 if (eon)
973 *eon = '\0';
974 *tail = alloc_ref(eov + 1);
975 if (buf.buf[0] == '@')
976 (*tail)->symref = xstrdup(buf.buf + 1);
977 else if (buf.buf[0] != '?')
978 get_sha1_hex(buf.buf, (*tail)->old_sha1);
f8ec9167
DB
979 if (eon) {
980 if (has_attribute(eon + 1, "unchanged")) {
981 (*tail)->status |= REF_STATUS_UPTODATE;
982 read_ref((*tail)->name, (*tail)->old_sha1);
983 }
984 }
6eb996b5
DB
985 tail = &((*tail)->next);
986 }
bf3c523c
IL
987 if (debug)
988 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
989 strbuf_release(&buf);
990
991 for (posn = ret; posn; posn = posn->next)
992 resolve_remote_symref(posn, ret);
993
994 return ret;
995}
996
c9e388bb 997int transport_helper_init(struct transport *transport, const char *name)
6eb996b5
DB
998{
999 struct helper_data *data = xcalloc(sizeof(*data), 1);
c9e388bb 1000 data->name = name;
6eb996b5 1001
bf3c523c
IL
1002 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1003 debug = 1;
1004
6eb996b5 1005 transport->data = data;
ef08ef9e 1006 transport->set_option = set_helper_option;
6eb996b5
DB
1007 transport->get_refs_list = get_refs_list;
1008 transport->fetch = fetch;
ae4efe19 1009 transport->push_refs = push_refs;
f2a37151 1010 transport->disconnect = release_helper;
b236752a 1011 transport->connect = connect_helper;
61b075bd 1012 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1013 return 0;
1014}
419f37db
IL
1015
1016/*
1017 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1018 * buffer less), so attempt reads and writes with up to that size.
1019 */
1020#define BUFFERSIZE 65536
1021/* This should be enough to hold debugging message. */
1022#define PBUFFERSIZE 8192
1023
1024/* Print bidirectional transfer loop debug message. */
4621085b 1025__attribute__((format (printf, 1, 2)))
419f37db
IL
1026static void transfer_debug(const char *fmt, ...)
1027{
1028 va_list args;
1029 char msgbuf[PBUFFERSIZE];
1030 static int debug_enabled = -1;
1031
1032 if (debug_enabled < 0)
1033 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1034 if (!debug_enabled)
1035 return;
1036
1037 va_start(args, fmt);
1038 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1039 va_end(args);
1040 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1041}
1042
1043/* Stream state: More data may be coming in this direction. */
1044#define SSTATE_TRANSFERING 0
1045/*
1046 * Stream state: No more data coming in this direction, flushing rest of
1047 * data.
1048 */
1049#define SSTATE_FLUSHING 1
1050/* Stream state: Transfer in this direction finished. */
1051#define SSTATE_FINISHED 2
1052
1053#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1054#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1055#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1056
1057/* Unidirectional transfer. */
1058struct unidirectional_transfer {
1059 /* Source */
1060 int src;
1061 /* Destination */
1062 int dest;
1063 /* Is source socket? */
1064 int src_is_sock;
1065 /* Is destination socket? */
1066 int dest_is_sock;
41ccfdd9 1067 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1068 int state;
1069 /* Buffer. */
1070 char buf[BUFFERSIZE];
1071 /* Buffer used. */
1072 size_t bufuse;
1073 /* Name of source. */
1074 const char *src_name;
1075 /* Name of destination. */
1076 const char *dest_name;
1077};
1078
1079/* Closes the target (for writing) if transfer has finished. */
1080static void udt_close_if_finished(struct unidirectional_transfer *t)
1081{
1082 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1083 t->state = SSTATE_FINISHED;
1084 if (t->dest_is_sock)
1085 shutdown(t->dest, SHUT_WR);
1086 else
1087 close(t->dest);
1088 transfer_debug("Closed %s.", t->dest_name);
1089 }
1090}
1091
1092/*
1093 * Tries to read read data from source into buffer. If buffer is full,
1094 * no data is read. Returns 0 on success, -1 on error.
1095 */
1096static int udt_do_read(struct unidirectional_transfer *t)
1097{
1098 ssize_t bytes;
1099
1100 if (t->bufuse == BUFFERSIZE)
1101 return 0; /* No space for more. */
1102
1103 transfer_debug("%s is readable", t->src_name);
1104 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1105 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1106 errno != EINTR) {
1107 error("read(%s) failed: %s", t->src_name, strerror(errno));
1108 return -1;
1109 } else if (bytes == 0) {
1110 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1111 t->src_name, (int)t->bufuse);
419f37db
IL
1112 t->state = SSTATE_FLUSHING;
1113 } else if (bytes > 0) {
1114 t->bufuse += bytes;
1115 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1116 (int)bytes, t->src_name, (int)t->bufuse);
1117 }
1118 return 0;
1119}
1120
1121/* Tries to write data from buffer into destination. If buffer is empty,
1122 * no data is written. Returns 0 on success, -1 on error.
1123 */
1124static int udt_do_write(struct unidirectional_transfer *t)
1125{
803dbdb9 1126 ssize_t bytes;
419f37db
IL
1127
1128 if (t->bufuse == 0)
1129 return 0; /* Nothing to write. */
1130
1131 transfer_debug("%s is writable", t->dest_name);
1132 bytes = write(t->dest, t->buf, t->bufuse);
1133 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1134 errno != EINTR) {
1135 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1136 return -1;
1137 } else if (bytes > 0) {
1138 t->bufuse -= bytes;
1139 if (t->bufuse)
1140 memmove(t->buf, t->buf + bytes, t->bufuse);
1141 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1142 (int)bytes, t->dest_name, (int)t->bufuse);
1143 }
1144 return 0;
1145}
1146
1147
1148/* State of bidirectional transfer loop. */
1149struct bidirectional_transfer_state {
1150 /* Direction from program to git. */
1151 struct unidirectional_transfer ptg;
1152 /* Direction from git to program. */
1153 struct unidirectional_transfer gtp;
1154};
1155
1156static void *udt_copy_task_routine(void *udt)
1157{
1158 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1159 while (t->state != SSTATE_FINISHED) {
1160 if (STATE_NEEDS_READING(t->state))
1161 if (udt_do_read(t))
1162 return NULL;
1163 if (STATE_NEEDS_WRITING(t->state))
1164 if (udt_do_write(t))
1165 return NULL;
1166 if (STATE_NEEDS_CLOSING(t->state))
1167 udt_close_if_finished(t);
1168 }
1169 return udt; /* Just some non-NULL value. */
1170}
1171
1172#ifndef NO_PTHREADS
1173
1174/*
98e023de 1175 * Join thread, with appropriate errors on failure. Name is name for the
419f37db
IL
1176 * thread (for error messages). Returns 0 on success, 1 on failure.
1177 */
1178static int tloop_join(pthread_t thread, const char *name)
1179{
1180 int err;
1181 void *tret;
1182 err = pthread_join(thread, &tret);
1183 if (!tret) {
1184 error("%s thread failed", name);
1185 return 1;
1186 }
1187 if (err) {
1188 error("%s thread failed to join: %s", name, strerror(err));
1189 return 1;
1190 }
1191 return 0;
1192}
1193
1194/*
1195 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1196 * -1 on failure.
1197 */
1198static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1199{
1200 pthread_t gtp_thread;
1201 pthread_t ptg_thread;
1202 int err;
1203 int ret = 0;
1204 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1205 &s->gtp);
1206 if (err)
1207 die("Can't start thread for copying data: %s", strerror(err));
1208 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1209 &s->ptg);
1210 if (err)
1211 die("Can't start thread for copying data: %s", strerror(err));
1212
1213 ret |= tloop_join(gtp_thread, "Git to program copy");
1214 ret |= tloop_join(ptg_thread, "Program to git copy");
1215 return ret;
1216}
1217#else
1218
1219/* Close the source and target (for writing) for transfer. */
1220static void udt_kill_transfer(struct unidirectional_transfer *t)
1221{
1222 t->state = SSTATE_FINISHED;
1223 /*
1224 * Socket read end left open isn't a disaster if nobody
1225 * attempts to read from it (mingw compat headers do not
1226 * have SHUT_RD)...
1227 *
1228 * We can't fully close the socket since otherwise gtp
1229 * task would first close the socket it sends data to
1230 * while closing the ptg file descriptors.
1231 */
1232 if (!t->src_is_sock)
1233 close(t->src);
1234 if (t->dest_is_sock)
1235 shutdown(t->dest, SHUT_WR);
1236 else
1237 close(t->dest);
1238}
1239
1240/*
98e023de 1241 * Join process, with appropriate errors on failure. Name is name for the
419f37db
IL
1242 * process (for error messages). Returns 0 on success, 1 on failure.
1243 */
1244static int tloop_join(pid_t pid, const char *name)
1245{
1246 int tret;
1247 if (waitpid(pid, &tret, 0) < 0) {
1248 error("%s process failed to wait: %s", name, strerror(errno));
1249 return 1;
1250 }
1251 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1252 error("%s process failed", name);
1253 return 1;
1254 }
1255 return 0;
1256}
1257
1258/*
1259 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1260 * -1 on failure.
1261 */
1262static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1263{
1264 pid_t pid1, pid2;
1265 int ret = 0;
1266
1267 /* Fork thread #1: git to program. */
1268 pid1 = fork();
1269 if (pid1 < 0)
1270 die_errno("Can't start thread for copying data");
1271 else if (pid1 == 0) {
1272 udt_kill_transfer(&s->ptg);
1273 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1274 }
1275
1276 /* Fork thread #2: program to git. */
1277 pid2 = fork();
1278 if (pid2 < 0)
1279 die_errno("Can't start thread for copying data");
1280 else if (pid2 == 0) {
1281 udt_kill_transfer(&s->gtp);
1282 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1283 }
1284
1285 /*
1286 * Close both streams in parent as to not interfere with
1287 * end of file detection and wait for both tasks to finish.
1288 */
1289 udt_kill_transfer(&s->gtp);
1290 udt_kill_transfer(&s->ptg);
1291 ret |= tloop_join(pid1, "Git to program copy");
1292 ret |= tloop_join(pid2, "Program to git copy");
1293 return ret;
1294}
1295#endif
1296
1297/*
1298 * Copies data from stdin to output and from input to stdout simultaneously.
1299 * Additionally filtering through given filter. If filter is NULL, uses
1300 * identity filter.
1301 */
1302int bidirectional_transfer_loop(int input, int output)
1303{
1304 struct bidirectional_transfer_state state;
1305
1306 /* Fill the state fields. */
1307 state.ptg.src = input;
1308 state.ptg.dest = 1;
1309 state.ptg.src_is_sock = (input == output);
1310 state.ptg.dest_is_sock = 0;
1311 state.ptg.state = SSTATE_TRANSFERING;
1312 state.ptg.bufuse = 0;
1313 state.ptg.src_name = "remote input";
1314 state.ptg.dest_name = "stdout";
1315
1316 state.gtp.src = 0;
1317 state.gtp.dest = output;
1318 state.gtp.src_is_sock = 0;
1319 state.gtp.dest_is_sock = (input == output);
1320 state.gtp.state = SSTATE_TRANSFERING;
1321 state.gtp.bufuse = 0;
1322 state.gtp.src_name = "stdin";
1323 state.gtp.dest_name = "remote output";
1324
1325 return tloop_spawnwait_tasks(&state);
1326}