transport-helper: propagate recvline() error pushing
[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");
5931b33e 61 return 1;
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 write_constant(int fd, const char *str)
75{
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");
80}
81
c2e86add 82static const char *remove_ext_force(const char *url)
25d5cc48
IL
83{
84 if (url) {
85 const char *colon = strchr(url, ':');
86 if (colon && colon[1] == ':')
87 return colon + 2;
88 }
89 return url;
90}
91
fa8c097c
IL
92static void do_take_over(struct transport *transport)
93{
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);
99}
100
6eb996b5
DB
101static struct child_process *get_helper(struct transport *transport)
102{
103 struct helper_data *data = transport->data;
bfc366d9 104 struct argv_array argv = ARGV_ARRAY_INIT;
6eb996b5
DB
105 struct strbuf buf = STRBUF_INIT;
106 struct child_process *helper;
72ff8943
DB
107 const char **refspecs = NULL;
108 int refspec_nr = 0;
109 int refspec_alloc = 0;
61b075bd 110 int duped;
6b02de3b 111 int code;
e1735872
DI
112 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
113 const char *helper_env[] = {
114 git_dir_buf,
115 NULL
116 };
117
6eb996b5
DB
118
119 if (data->helper)
120 return data->helper;
121
122 helper = xcalloc(1, sizeof(*helper));
123 helper->in = -1;
124 helper->out = -1;
125 helper->err = 0;
bfc366d9
FA
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);
6b02de3b
IL
130 helper->git_cmd = 0;
131 helper->silent_exec_failure = 1;
e1735872
DI
132
133 snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
134 helper->env = helper_env;
135
6b02de3b
IL
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);
141
6eb996b5 142 data->helper = helper;
fa8c097c 143 data->no_disconnect_req = 0;
6eb996b5 144
61b075bd
IL
145 /*
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.
61b075bd
IL
149 */
150 duped = dup(helper->out);
151 if (duped < 0)
152 die_errno("Can't dup helper output fd");
153 data->out = xfdopen(duped, "r");
154
bf3c523c 155 write_constant(helper->in, "capabilities\n");
2d14d65c 156
6eb996b5 157 while (1) {
28ed5b35
IL
158 const char *capname;
159 int mandatory = 0;
5931b33e
FC
160 if (recvline(data, &buf))
161 exit(128);
6eb996b5
DB
162
163 if (!*buf.buf)
164 break;
28ed5b35
IL
165
166 if (*buf.buf == '*') {
167 capname = buf.buf + 1;
168 mandatory = 1;
169 } else
170 capname = buf.buf;
171
bf3c523c 172 if (debug)
28ed5b35
IL
173 fprintf(stderr, "Debug: Got cap %s\n", capname);
174 if (!strcmp(capname, "fetch"))
6eb996b5 175 data->fetch = 1;
28ed5b35 176 else if (!strcmp(capname, "option"))
ef08ef9e 177 data->option = 1;
28ed5b35 178 else if (!strcmp(capname, "push"))
ae4efe19 179 data->push = 1;
28ed5b35 180 else if (!strcmp(capname, "import"))
e65e91ed 181 data->import = 1;
bfc366d9
FA
182 else if (!strcmp(capname, "bidi-import"))
183 data->bidi_import = 1;
73b49a75
SR
184 else if (!strcmp(capname, "export"))
185 data->export = 1;
9ba38048
NTND
186 else if (!strcmp(capname, "check-connectivity"))
187 data->check_connectivity = 1;
59556548 188 else if (!data->refspecs && starts_with(capname, "refspec ")) {
72ff8943
DB
189 ALLOC_GROW(refspecs,
190 refspec_nr + 1,
191 refspec_alloc);
c28cce55 192 refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec "));
fa8c097c
IL
193 } else if (!strcmp(capname, "connect")) {
194 data->connect = 1;
0d957a4d
JK
195 } else if (!strcmp(capname, "signed-tags")) {
196 data->signed_tags = 1;
59556548 197 } else if (starts_with(capname, "export-marks ")) {
a515ebe9
SR
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);
59556548 202 } else if (starts_with(capname, "import-marks")) {
a515ebe9
SR
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);
59556548 207 } else if (starts_with(capname, "no-private-update")) {
597b831a 208 data->no_private_update = 1;
28ed5b35 209 } else if (mandatory) {
9517e6b8 210 die("Unknown mandatory capability %s. This remote "
82247e9b 211 "helper probably needs newer version of Git.",
28ed5b35 212 capname);
72ff8943
DB
213 }
214 }
215 if (refspecs) {
216 int i;
217 data->refspec_nr = refspec_nr;
218 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
b120ef3e 219 for (i = 0; i < refspec_nr; i++)
72ff8943 220 free((char *)refspecs[i]);
72ff8943 221 free(refspecs);
a93b4a09
FC
222 } else if (data->import || data->bidi_import || data->export) {
223 warning("This remote helper should implement refspec capability.");
6eb996b5 224 }
b962dbdc 225 strbuf_release(&buf);
bf3c523c
IL
226 if (debug)
227 fprintf(stderr, "Debug: Capabilities complete.\n");
6eb996b5
DB
228 return data->helper;
229}
230
231static int disconnect_helper(struct transport *transport)
232{
233 struct helper_data *data = transport->data;
cc567322 234 int res = 0;
bf3c523c 235
6eb996b5 236 if (data->helper) {
bf3c523c
IL
237 if (debug)
238 fprintf(stderr, "Debug: Disconnecting.\n");
fa8c097c 239 if (!data->no_disconnect_req) {
c34fe630
JK
240 /*
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.
245 */
246 sigchain_push(SIGPIPE, SIG_IGN);
247 xwrite(data->helper->in, "\n", 1);
248 sigchain_pop(SIGPIPE);
fa8c097c 249 }
6eb996b5 250 close(data->helper->in);
61b075bd 251 close(data->helper->out);
292ce46b 252 fclose(data->out);
cc567322 253 res = finish_command(data->helper);
bfc366d9 254 argv_array_free_detached(data->helper->argv);
6eb996b5
DB
255 free(data->helper);
256 data->helper = NULL;
257 }
cc567322 258 return res;
6eb996b5
DB
259}
260
ef08ef9e
SP
261static const char *unsupported_options[] = {
262 TRANS_OPT_UPLOADPACK,
263 TRANS_OPT_RECEIVEPACK,
264 TRANS_OPT_THIN,
265 TRANS_OPT_KEEP
266 };
23cd01ec 267
ef08ef9e
SP
268static const char *boolean_options[] = {
269 TRANS_OPT_THIN,
270 TRANS_OPT_KEEP,
271 TRANS_OPT_FOLLOWTAGS
272 };
273
274static int set_helper_option(struct transport *transport,
275 const char *name, const char *value)
276{
277 struct helper_data *data = transport->data;
ef08ef9e
SP
278 struct strbuf buf = STRBUF_INIT;
279 int i, ret, is_bool = 0;
280
bf3c523c
IL
281 get_helper(transport);
282
ef08ef9e
SP
283 if (!data->option)
284 return 1;
285
286 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
287 if (!strcmp(name, unsupported_options[i]))
288 return 1;
289 }
290
291 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
292 if (!strcmp(name, boolean_options[i])) {
293 is_bool = 1;
294 break;
295 }
296 }
297
298 strbuf_addf(&buf, "option %s ", name);
299 if (is_bool)
300 strbuf_addstr(&buf, value ? "true" : "false");
301 else
302 quote_c_style(value, &buf, NULL, 0);
303 strbuf_addch(&buf, '\n');
304
4a1b59c8 305 sendline(data, &buf);
5931b33e
FC
306 if (recvline(data, &buf))
307 exit(128);
ef08ef9e
SP
308
309 if (!strcmp(buf.buf, "ok"))
310 ret = 0;
59556548 311 else if (starts_with(buf.buf, "error")) {
ef08ef9e
SP
312 ret = -1;
313 } else if (!strcmp(buf.buf, "unsupported"))
314 ret = 1;
315 else {
316 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
317 ret = 1;
318 }
319 strbuf_release(&buf);
320 return ret;
321}
322
323static void standard_options(struct transport *t)
324{
325 char buf[16];
326 int n;
327 int v = t->verbose;
ef08ef9e 328
d01b3c02 329 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e
SP
330
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);
335}
336
f2a37151
DB
337static int release_helper(struct transport *transport)
338{
cc567322 339 int res = 0;
72ff8943
DB
340 struct helper_data *data = transport->data;
341 free_refspec(data->refspec_nr, data->refspecs);
342 data->refspecs = NULL;
cc567322 343 res = disconnect_helper(transport);
f2a37151 344 free(transport->data);
cc567322 345 return res;
f2a37151
DB
346}
347
6eb996b5 348static int fetch_with_fetch(struct transport *transport,
37148311 349 int nr_heads, struct ref **to_fetch)
6eb996b5 350{
292ce46b 351 struct helper_data *data = transport->data;
6eb996b5
DB
352 int i;
353 struct strbuf buf = STRBUF_INIT;
354
ef08ef9e 355 standard_options(transport);
9ba38048
NTND
356 if (data->check_connectivity &&
357 data->transport_options.check_self_contained_and_connected)
358 set_helper_option(transport, "check-connectivity", "true");
ef08ef9e 359
16094885
NTND
360 if (transport->cloning)
361 set_helper_option(transport, "cloning", "true");
362
363 if (data->transport_options.update_shallow)
364 set_helper_option(transport, "update-shallow", "true");
365
6eb996b5 366 for (i = 0; i < nr_heads; i++) {
1088261f 367 const struct ref *posn = to_fetch[i];
6eb996b5
DB
368 if (posn->status & REF_STATUS_UPTODATE)
369 continue;
2d14d65c
DB
370
371 strbuf_addf(&buf, "fetch %s %s\n",
372 sha1_to_hex(posn->old_sha1), posn->name);
292ce46b 373 }
2d14d65c 374
292ce46b 375 strbuf_addch(&buf, '\n');
bf3c523c 376 sendline(data, &buf);
292ce46b
SP
377
378 while (1) {
5931b33e
FC
379 if (recvline(data, &buf))
380 exit(128);
292ce46b 381
59556548 382 if (starts_with(buf.buf, "lock ")) {
292ce46b
SP
383 const char *name = buf.buf + 5;
384 if (transport->pack_lockfile)
385 warning("%s also locked %s", data->name, name);
386 else
387 transport->pack_lockfile = xstrdup(name);
388 }
9ba38048
NTND
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;
292ce46b
SP
393 else if (!buf.len)
394 break;
395 else
396 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 397 }
292ce46b 398 strbuf_release(&buf);
6eb996b5
DB
399 return 0;
400}
401
e65e91ed
DB
402static int get_importer(struct transport *transport, struct child_process *fastimport)
403{
404 struct child_process *helper = get_helper(transport);
bfc366d9
FA
405 struct helper_data *data = transport->data;
406 struct argv_array argv = ARGV_ARRAY_INIT;
407 int cat_blob_fd, code;
e65e91ed
DB
408 memset(fastimport, 0, sizeof(*fastimport));
409 fastimport->in = helper->out;
bfc366d9 410 argv_array_push(&argv, "fast-import");
19ba02af 411 argv_array_push(&argv, debug ? "--stats" : "--quiet");
e65e91ed 412
bfc366d9
FA
413 if (data->bidi_import) {
414 cat_blob_fd = xdup(helper->in);
415 argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
416 }
417 fastimport->argv = argv.argv;
e65e91ed 418 fastimport->git_cmd = 1;
bfc366d9
FA
419
420 code = start_command(fastimport);
421 return code;
e65e91ed
DB
422}
423
73b49a75
SR
424static int get_exporter(struct transport *transport,
425 struct child_process *fastexport,
73b49a75
SR
426 struct string_list *revlist_args)
427{
a515ebe9 428 struct helper_data *data = transport->data;
73b49a75
SR
429 struct child_process *helper = get_helper(transport);
430 int argc = 0, i;
431 memset(fastexport, 0, sizeof(*fastexport));
432
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);
b8bd826f 436 fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
73b49a75 437 fastexport->argv[argc++] = "fast-export";
1f25c504 438 fastexport->argv[argc++] = "--use-done-feature";
0d957a4d
JK
439 fastexport->argv[argc++] = data->signed_tags ?
440 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
a515ebe9
SR
441 if (data->export_marks)
442 fastexport->argv[argc++] = data->export_marks;
443 if (data->import_marks)
444 fastexport->argv[argc++] = data->import_marks;
73b49a75
SR
445
446 for (i = 0; i < revlist_args->nr; i++)
447 fastexport->argv[argc++] = revlist_args->items[i].string;
448
449 fastexport->git_cmd = 1;
450 return start_command(fastexport);
451}
452
e65e91ed
DB
453static int fetch_with_import(struct transport *transport,
454 int nr_heads, struct ref **to_fetch)
455{
456 struct child_process fastimport;
72ff8943 457 struct helper_data *data = transport->data;
e65e91ed
DB
458 int i;
459 struct ref *posn;
460 struct strbuf buf = STRBUF_INIT;
461
bf3c523c
IL
462 get_helper(transport);
463
e65e91ed
DB
464 if (get_importer(transport, &fastimport))
465 die("Couldn't run fast-import");
466
467 for (i = 0; i < nr_heads; i++) {
468 posn = to_fetch[i];
469 if (posn->status & REF_STATUS_UPTODATE)
470 continue;
471
472 strbuf_addf(&buf, "import %s\n", posn->name);
bf3c523c 473 sendline(data, &buf);
e65e91ed
DB
474 strbuf_reset(&buf);
475 }
9504bc9d
SR
476
477 write_constant(data->helper->in, "\n");
bfc366d9
FA
478 /*
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.
484 */
9504bc9d 485
cc567322
SR
486 if (finish_command(&fastimport))
487 die("Error while running fast-import");
bfc366d9 488 argv_array_free_detached(fastimport.argv);
e65e91ed 489
dff9d65d
FA
490 /*
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.
495 *
496 * (If no "refspec" capability was specified, for historical
7a43c554 497 * reasons we default to the equivalent of *:*.)
dff9d65d
FA
498 *
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.
504 */
e65e91ed 505 for (i = 0; i < nr_heads; i++) {
72ff8943 506 char *private;
e65e91ed
DB
507 posn = to_fetch[i];
508 if (posn->status & REF_STATUS_UPTODATE)
509 continue;
72ff8943
DB
510 if (data->refspecs)
511 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
512 else
c28cce55 513 private = xstrdup(posn->name);
d51b720f
MH
514 if (private) {
515 read_ref(private, posn->old_sha1);
516 free(private);
517 }
e65e91ed 518 }
b962dbdc 519 strbuf_release(&buf);
e65e91ed
DB
520 return 0;
521}
522
fa8c097c
IL
523static int process_connect_service(struct transport *transport,
524 const char *name, const char *exec)
525{
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;
531
532 helper = get_helper(transport);
533
534 /*
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.
539 */
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);
545
546 /*
547 * Handle --upload-pack and friends. This is fire and forget...
548 * just warn if it fails.
549 */
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.");
556 }
557
558 if (data->connect)
559 strbuf_addf(&cmdbuf, "connect %s\n", name);
560 else
561 goto exit;
562
563 sendline(data, &cmdbuf);
5931b33e
FC
564 if (recvline_fh(input, &cmdbuf, name))
565 exit(128);
566
fa8c097c
IL
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);
580
581exit:
582 fclose(input);
583 return ret;
584}
585
586static int process_connect(struct transport *transport,
587 int for_push)
588{
589 struct helper_data *data = transport->data;
590 const char *name;
591 const char *exec;
592
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;
598
599 return process_connect_service(transport, name, exec);
600}
601
b236752a
IL
602static int connect_helper(struct transport *transport, const char *name,
603 const char *exec, int fd[2])
604{
605 struct helper_data *data = transport->data;
606
607 /* Get_helper so connect is inited. */
608 get_helper(transport);
609 if (!data->connect)
610 die("Operation not supported by protocol.");
611
612 if (!process_connect_service(transport, name, exec))
613 die("Can't connect to subservice %s.", name);
614
615 fd[0] = data->helper->out;
616 fd[1] = data->helper->in;
617 return 0;
618}
619
6eb996b5 620static int fetch(struct transport *transport,
37148311 621 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
622{
623 struct helper_data *data = transport->data;
624 int i, count;
625
fa8c097c
IL
626 if (process_connect(transport, 0)) {
627 do_take_over(transport);
628 return transport->fetch(transport, nr_heads, to_fetch);
629 }
630
6eb996b5
DB
631 count = 0;
632 for (i = 0; i < nr_heads; i++)
633 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
634 count++;
635
636 if (!count)
637 return 0;
638
639 if (data->fetch)
640 return fetch_with_fetch(transport, nr_heads, to_fetch);
641
e65e91ed
DB
642 if (data->import)
643 return fetch_with_import(transport, nr_heads, to_fetch);
644
6eb996b5
DB
645 return -1;
646}
647
664059fb 648static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
649 struct ref **ref,
650 struct ref *remote_refs)
651{
652 char *refname, *msg;
f9e3c6be 653 int status, forced = 0;
d2e73c6f 654
59556548 655 if (starts_with(buf->buf, "ok ")) {
d2e73c6f
SR
656 status = REF_STATUS_OK;
657 refname = buf->buf + 3;
59556548 658 } else if (starts_with(buf->buf, "error ")) {
d2e73c6f
SR
659 status = REF_STATUS_REMOTE_REJECT;
660 refname = buf->buf + 6;
661 } else
82247e9b 662 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
663
664 msg = strchr(refname, ' ');
665 if (msg) {
666 struct strbuf msg_buf = STRBUF_INIT;
667 const char *end;
668
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);
675
676 if (!strcmp(msg, "no match")) {
677 status = REF_STATUS_NONE;
678 free(msg);
679 msg = NULL;
680 }
681 else if (!strcmp(msg, "up to date")) {
682 status = REF_STATUS_UPTODATE;
683 free(msg);
684 msg = NULL;
685 }
686 else if (!strcmp(msg, "non-fast forward")) {
687 status = REF_STATUS_REJECT_NONFASTFORWARD;
688 free(msg);
689 msg = NULL;
690 }
dbfeddb1
CR
691 else if (!strcmp(msg, "already exists")) {
692 status = REF_STATUS_REJECT_ALREADY_EXISTS;
693 free(msg);
694 msg = NULL;
695 }
75e5c0dc
JH
696 else if (!strcmp(msg, "fetch first")) {
697 status = REF_STATUS_REJECT_FETCH_FIRST;
698 free(msg);
699 msg = NULL;
700 }
701 else if (!strcmp(msg, "needs force")) {
702 status = REF_STATUS_REJECT_NEEDS_FORCE;
703 free(msg);
704 msg = NULL;
705 }
631b5ef2
JH
706 else if (!strcmp(msg, "stale info")) {
707 status = REF_STATUS_REJECT_STALE;
708 free(msg);
709 msg = NULL;
710 }
f9e3c6be
FC
711 else if (!strcmp(msg, "forced update")) {
712 forced = 1;
713 free(msg);
714 msg = NULL;
715 }
d2e73c6f
SR
716 }
717
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);
664059fb 724 return 1;
d2e73c6f
SR
725 }
726
727 if ((*ref)->status != REF_STATUS_NONE) {
728 /*
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'.
731 */
732 if (status == REF_STATUS_NONE)
664059fb 733 return 1;
d2e73c6f
SR
734 }
735
736 (*ref)->status = status;
cf31f70c 737 (*ref)->forced_update |= forced;
d2e73c6f 738 (*ref)->remote_status = msg;
126aac5c 739 return !(status == REF_STATUS_OK);
d2e73c6f
SR
740}
741
0551a06c 742static int push_update_refs_status(struct helper_data *data,
5a75353f
FC
743 struct ref *remote_refs,
744 int flags)
d2e73c6f
SR
745{
746 struct strbuf buf = STRBUF_INIT;
747 struct ref *ref = remote_refs;
0551a06c
FC
748 int ret = 0;
749
d2e73c6f 750 for (;;) {
664059fb
FC
751 char *private;
752
0551a06c
FC
753 if (recvline(data, &buf)) {
754 ret = 1;
755 break;
756 }
757
d2e73c6f
SR
758 if (!buf.len)
759 break;
760
664059fb
FC
761 if (push_update_ref_status(&buf, &ref, remote_refs))
762 continue;
763
5a75353f 764 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
664059fb
FC
765 continue;
766
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);
d2e73c6f
SR
773 }
774 strbuf_release(&buf);
0551a06c 775 return ret;
d2e73c6f
SR
776}
777
73b49a75 778static int push_refs_with_push(struct transport *transport,
05c1eb10 779 struct ref *remote_refs, int flags)
ae4efe19
SP
780{
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;
ae4efe19 785 struct ref *ref;
05c1eb10
JH
786 struct string_list cas_options = STRING_LIST_INIT_DUP;
787 struct string_list_item *cas_option;
ae4efe19 788
c0aa335c 789 get_helper(transport);
ae4efe19
SP
790 if (!data->push)
791 return 1;
792
793 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 794 if (!ref->peer_ref && !mirror)
ae4efe19
SP
795 continue;
796
20e8b465
TRC
797 /* Check for statuses set by set_ref_status_for_push() */
798 switch (ref->status) {
799 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 800 case REF_STATUS_REJECT_STALE:
dbfeddb1 801 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 802 case REF_STATUS_UPTODATE:
ae4efe19 803 continue;
20e8b465
TRC
804 default:
805 ; /* do nothing */
ae4efe19
SP
806 }
807
808 if (force_all)
809 ref->force = 1;
810
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));
819 }
820 strbuf_addch(&buf, ':');
821 strbuf_addstr(&buf, ref->name);
822 strbuf_addch(&buf, '\n');
05c1eb10
JH
823
824 /*
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.
830 */
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));
836 }
ae4efe19 837 }
05c1eb10
JH
838 if (buf.len == 0) {
839 string_list_clear(&cas_options, 0);
d8f67d20 840 return 0;
05c1eb10 841 }
ae4efe19 842
ae4efe19 843 standard_options(transport);
05c1eb10
JH
844 for_each_string_list_item(cas_option, &cas_options)
845 set_helper_option(transport, "cas", cas_option->string);
ae4efe19
SP
846
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);
850 }
851
852 strbuf_addch(&buf, '\n');
bf3c523c 853 sendline(data, &buf);
ae4efe19 854 strbuf_release(&buf);
d2e73c6f 855
0551a06c 856 return push_update_refs_status(data, remote_refs, flags);
ae4efe19
SP
857}
858
73b49a75
SR
859static int push_refs_with_export(struct transport *transport,
860 struct ref *remote_refs, int flags)
861{
862 struct ref *ref;
863 struct child_process *helper, exporter;
864 struct helper_data *data = transport->data;
183113a5 865 struct string_list revlist_args = STRING_LIST_INIT_NODUP;
73b49a75
SR
866 struct strbuf buf = STRBUF_INIT;
867
21610d82
FC
868 if (!data->refspecs)
869 die("remote-helper doesn't support push; refspec needed");
870
21457f57
FC
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);
874 }
875
510fa6f5
FC
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);
879 }
880
73b49a75
SR
881 helper = get_helper(transport);
882
883 write_constant(helper->in, "export\n");
884
73b49a75
SR
885 strbuf_reset(&buf);
886
887 for (ref = remote_refs; ref; ref = ref->next) {
888 char *private;
889 unsigned char sha1[20];
890
9c51558c
FC
891 if (ref->deletion)
892 die("remote-helpers do not support ref deletion");
893
73b49a75
SR
894 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
895 if (private && !get_sha1(private, sha1)) {
896 strbuf_addf(&buf, "^%s", private);
1d2f80fa 897 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
b056620f 898 hashcpy(ref->old_sha1, sha1);
73b49a75 899 }
2faa1527 900 free(private);
73b49a75 901
67c9c782
FC
902 if (ref->peer_ref) {
903 if (strcmp(ref->peer_ref->name, ref->name))
904 die("remote-helpers do not support old:new syntax");
3ea7d094 905 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 906 }
73b49a75
SR
907 }
908
a515ebe9 909 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
910 die("Couldn't run fast-export");
911
cc567322
SR
912 if (finish_command(&exporter))
913 die("Error while running fast-export");
0551a06c 914 return push_update_refs_status(data, remote_refs, flags);
73b49a75
SR
915}
916
917static int push_refs(struct transport *transport,
918 struct ref *remote_refs, int flags)
919{
920 struct helper_data *data = transport->data;
921
922 if (process_connect(transport, 1)) {
923 do_take_over(transport);
924 return transport->push_refs(transport, remote_refs, flags);
925 }
926
927 if (!remote_refs) {
928 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
929 "Perhaps you should specify a branch such as 'master'.\n");
930 return 0;
931 }
932
933 if (data->push)
934 return push_refs_with_push(transport, remote_refs, flags);
935
936 if (data->export)
937 return push_refs_with_export(transport, remote_refs, flags);
938
939 return -1;
940}
941
942
f8ec9167
DB
943static int has_attribute(const char *attrs, const char *attr) {
944 int len;
945 if (!attrs)
946 return 0;
947
948 len = strlen(attr);
949 for (;;) {
950 const char *space = strchrnul(attrs, ' ');
951 if (len == space - attrs && !strncmp(attrs, attr, len))
952 return 1;
953 if (!*space)
954 return 0;
955 attrs = space + 1;
956 }
957}
958
6eb996b5
DB
959static struct ref *get_refs_list(struct transport *transport, int for_push)
960{
292ce46b 961 struct helper_data *data = transport->data;
6eb996b5
DB
962 struct child_process *helper;
963 struct ref *ret = NULL;
964 struct ref **tail = &ret;
965 struct ref *posn;
966 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
967
968 helper = get_helper(transport);
2d14d65c 969
fa8c097c
IL
970 if (process_connect(transport, for_push)) {
971 do_take_over(transport);
972 return transport->get_refs_list(transport, for_push);
973 }
974
ae4efe19
SP
975 if (data->push && for_push)
976 write_str_in_full(helper->in, "list for-push\n");
977 else
978 write_str_in_full(helper->in, "list\n");
6eb996b5 979
6eb996b5
DB
980 while (1) {
981 char *eov, *eon;
5931b33e
FC
982 if (recvline(data, &buf))
983 exit(128);
6eb996b5
DB
984
985 if (!*buf.buf)
986 break;
987
988 eov = strchr(buf.buf, ' ');
989 if (!eov)
990 die("Malformed response in ref list: %s", buf.buf);
991 eon = strchr(eov + 1, ' ');
992 *eov = '\0';
993 if (eon)
994 *eon = '\0';
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);
f8ec9167
DB
1000 if (eon) {
1001 if (has_attribute(eon + 1, "unchanged")) {
1002 (*tail)->status |= REF_STATUS_UPTODATE;
1003 read_ref((*tail)->name, (*tail)->old_sha1);
1004 }
1005 }
6eb996b5
DB
1006 tail = &((*tail)->next);
1007 }
bf3c523c
IL
1008 if (debug)
1009 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
1010 strbuf_release(&buf);
1011
1012 for (posn = ret; posn; posn = posn->next)
1013 resolve_remote_symref(posn, ret);
1014
1015 return ret;
1016}
1017
c9e388bb 1018int transport_helper_init(struct transport *transport, const char *name)
6eb996b5
DB
1019{
1020 struct helper_data *data = xcalloc(sizeof(*data), 1);
c9e388bb 1021 data->name = name;
6eb996b5 1022
bf3c523c
IL
1023 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1024 debug = 1;
1025
6eb996b5 1026 transport->data = data;
ef08ef9e 1027 transport->set_option = set_helper_option;
6eb996b5
DB
1028 transport->get_refs_list = get_refs_list;
1029 transport->fetch = fetch;
ae4efe19 1030 transport->push_refs = push_refs;
f2a37151 1031 transport->disconnect = release_helper;
b236752a 1032 transport->connect = connect_helper;
61b075bd 1033 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1034 return 0;
1035}
419f37db
IL
1036
1037/*
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.
1040 */
1041#define BUFFERSIZE 65536
1042/* This should be enough to hold debugging message. */
1043#define PBUFFERSIZE 8192
1044
1045/* Print bidirectional transfer loop debug message. */
4621085b 1046__attribute__((format (printf, 1, 2)))
419f37db
IL
1047static void transfer_debug(const char *fmt, ...)
1048{
1049 va_list args;
1050 char msgbuf[PBUFFERSIZE];
1051 static int debug_enabled = -1;
1052
1053 if (debug_enabled < 0)
1054 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1055 if (!debug_enabled)
1056 return;
1057
1058 va_start(args, fmt);
1059 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1060 va_end(args);
1061 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1062}
1063
1064/* Stream state: More data may be coming in this direction. */
1065#define SSTATE_TRANSFERING 0
1066/*
1067 * Stream state: No more data coming in this direction, flushing rest of
1068 * data.
1069 */
1070#define SSTATE_FLUSHING 1
1071/* Stream state: Transfer in this direction finished. */
1072#define SSTATE_FINISHED 2
1073
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)
1077
1078/* Unidirectional transfer. */
1079struct unidirectional_transfer {
1080 /* Source */
1081 int src;
1082 /* Destination */
1083 int dest;
1084 /* Is source socket? */
1085 int src_is_sock;
1086 /* Is destination socket? */
1087 int dest_is_sock;
41ccfdd9 1088 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1089 int state;
1090 /* Buffer. */
1091 char buf[BUFFERSIZE];
1092 /* Buffer used. */
1093 size_t bufuse;
1094 /* Name of source. */
1095 const char *src_name;
1096 /* Name of destination. */
1097 const char *dest_name;
1098};
1099
1100/* Closes the target (for writing) if transfer has finished. */
1101static void udt_close_if_finished(struct unidirectional_transfer *t)
1102{
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);
1107 else
1108 close(t->dest);
1109 transfer_debug("Closed %s.", t->dest_name);
1110 }
1111}
1112
1113/*
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.
1116 */
1117static int udt_do_read(struct unidirectional_transfer *t)
1118{
1119 ssize_t bytes;
1120
1121 if (t->bufuse == BUFFERSIZE)
1122 return 0; /* No space for more. */
1123
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 &&
1127 errno != EINTR) {
1128 error("read(%s) failed: %s", t->src_name, strerror(errno));
1129 return -1;
1130 } else if (bytes == 0) {
1131 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1132 t->src_name, (int)t->bufuse);
419f37db
IL
1133 t->state = SSTATE_FLUSHING;
1134 } else if (bytes > 0) {
1135 t->bufuse += bytes;
1136 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1137 (int)bytes, t->src_name, (int)t->bufuse);
1138 }
1139 return 0;
1140}
1141
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.
1144 */
1145static int udt_do_write(struct unidirectional_transfer *t)
1146{
803dbdb9 1147 ssize_t bytes;
419f37db
IL
1148
1149 if (t->bufuse == 0)
1150 return 0; /* Nothing to write. */
1151
1152 transfer_debug("%s is writable", t->dest_name);
7edc02f4
EFL
1153 bytes = xwrite(t->dest, t->buf, t->bufuse);
1154 if (bytes < 0 && errno != EWOULDBLOCK) {
419f37db
IL
1155 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1156 return -1;
1157 } else if (bytes > 0) {
1158 t->bufuse -= bytes;
1159 if (t->bufuse)
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);
1163 }
1164 return 0;
1165}
1166
1167
1168/* State of bidirectional transfer loop. */
1169struct 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;
1174};
1175
1176static void *udt_copy_task_routine(void *udt)
1177{
1178 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1179 while (t->state != SSTATE_FINISHED) {
1180 if (STATE_NEEDS_READING(t->state))
1181 if (udt_do_read(t))
1182 return NULL;
1183 if (STATE_NEEDS_WRITING(t->state))
1184 if (udt_do_write(t))
1185 return NULL;
1186 if (STATE_NEEDS_CLOSING(t->state))
1187 udt_close_if_finished(t);
1188 }
1189 return udt; /* Just some non-NULL value. */
1190}
1191
1192#ifndef NO_PTHREADS
1193
1194/*
98e023de 1195 * Join thread, with appropriate errors on failure. Name is name for the
419f37db
IL
1196 * thread (for error messages). Returns 0 on success, 1 on failure.
1197 */
1198static int tloop_join(pthread_t thread, const char *name)
1199{
1200 int err;
1201 void *tret;
1202 err = pthread_join(thread, &tret);
1203 if (!tret) {
1204 error("%s thread failed", name);
1205 return 1;
1206 }
1207 if (err) {
1208 error("%s thread failed to join: %s", name, strerror(err));
1209 return 1;
1210 }
1211 return 0;
1212}
1213
1214/*
1215 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1216 * -1 on failure.
1217 */
1218static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1219{
1220 pthread_t gtp_thread;
1221 pthread_t ptg_thread;
1222 int err;
1223 int ret = 0;
1224 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1225 &s->gtp);
1226 if (err)
1227 die("Can't start thread for copying data: %s", strerror(err));
1228 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1229 &s->ptg);
1230 if (err)
1231 die("Can't start thread for copying data: %s", strerror(err));
1232
1233 ret |= tloop_join(gtp_thread, "Git to program copy");
1234 ret |= tloop_join(ptg_thread, "Program to git copy");
1235 return ret;
1236}
1237#else
1238
1239/* Close the source and target (for writing) for transfer. */
1240static void udt_kill_transfer(struct unidirectional_transfer *t)
1241{
1242 t->state = SSTATE_FINISHED;
1243 /*
1244 * Socket read end left open isn't a disaster if nobody
1245 * attempts to read from it (mingw compat headers do not
1246 * have SHUT_RD)...
1247 *
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.
1251 */
1252 if (!t->src_is_sock)
1253 close(t->src);
1254 if (t->dest_is_sock)
1255 shutdown(t->dest, SHUT_WR);
1256 else
1257 close(t->dest);
1258}
1259
1260/*
98e023de 1261 * Join process, with appropriate errors on failure. Name is name for the
419f37db
IL
1262 * process (for error messages). Returns 0 on success, 1 on failure.
1263 */
1264static int tloop_join(pid_t pid, const char *name)
1265{
1266 int tret;
1267 if (waitpid(pid, &tret, 0) < 0) {
1268 error("%s process failed to wait: %s", name, strerror(errno));
1269 return 1;
1270 }
1271 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1272 error("%s process failed", name);
1273 return 1;
1274 }
1275 return 0;
1276}
1277
1278/*
1279 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1280 * -1 on failure.
1281 */
1282static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1283{
1284 pid_t pid1, pid2;
1285 int ret = 0;
1286
1287 /* Fork thread #1: git to program. */
1288 pid1 = fork();
1289 if (pid1 < 0)
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);
1294 }
1295
1296 /* Fork thread #2: program to git. */
1297 pid2 = fork();
1298 if (pid2 < 0)
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);
1303 }
1304
1305 /*
1306 * Close both streams in parent as to not interfere with
1307 * end of file detection and wait for both tasks to finish.
1308 */
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");
1313 return ret;
1314}
1315#endif
1316
1317/*
1318 * Copies data from stdin to output and from input to stdout simultaneously.
1319 * Additionally filtering through given filter. If filter is NULL, uses
1320 * identity filter.
1321 */
1322int bidirectional_transfer_loop(int input, int output)
1323{
1324 struct bidirectional_transfer_state state;
1325
1326 /* Fill the state fields. */
1327 state.ptg.src = input;
1328 state.ptg.dest = 1;
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";
1335
1336 state.gtp.src = 0;
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";
1344
1345 return tloop_spawnwait_tasks(&state);
1346}