coccinelle: add a rule to make "type" code use FREE_AND_NULL()
[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"
72ff8943 8#include "remote.h"
73b49a75 9#include "string-list.h"
7851b1e6 10#include "thread-utils.h"
c34fe630 11#include "sigchain.h"
bfc366d9 12#include "argv-array.h"
664059fb 13#include "refs.h"
7851b1e6 14
bf3c523c
IL
15static int debug;
16
9cba13ca 17struct helper_data {
6eb996b5
DB
18 const char *name;
19 struct child_process *helper;
292ce46b 20 FILE *out;
ef08ef9e 21 unsigned fetch : 1,
a24a32dd 22 import : 1,
bfc366d9 23 bidi_import : 1,
73b49a75 24 export : 1,
ae4efe19 25 option : 1,
fa8c097c
IL
26 push : 1,
27 connect : 1,
0d957a4d 28 signed_tags : 1,
9ba38048 29 check_connectivity : 1,
597b831a
MM
30 no_disconnect_req : 1,
31 no_private_update : 1;
a515ebe9
SR
32 char *export_marks;
33 char *import_marks;
72ff8943
DB
34 /* These go from remote name (as in "list") to private name */
35 struct refspec *refspecs;
36 int refspec_nr;
61b075bd
IL
37 /* Transport options for fetch-pack/send-pack (should one of
38 * those be invoked).
39 */
40 struct git_transport_options transport_options;
6eb996b5
DB
41};
42
bf3c523c
IL
43static void sendline(struct helper_data *helper, struct strbuf *buffer)
44{
45 if (debug)
46 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
47 if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
48 != buffer->len)
49 die_errno("Full write to remote helper failed");
50}
51
c096955c 52static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
bf3c523c
IL
53{
54 strbuf_reset(buffer);
55 if (debug)
56 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
692dfdfa 57 if (strbuf_getline(buffer, helper) == EOF) {
bf3c523c
IL
58 if (debug)
59 fprintf(stderr, "Debug: Remote helper quit.\n");
5931b33e 60 return 1;
bf3c523c
IL
61 }
62
63 if (debug)
64 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
65 return 0;
66}
67
fa8c097c
IL
68static int recvline(struct helper_data *helper, struct strbuf *buffer)
69{
c096955c 70 return recvline_fh(helper->out, buffer, helper->name);
fa8c097c
IL
71}
72
bf3c523c
IL
73static void write_constant(int fd, const char *str)
74{
75 if (debug)
76 fprintf(stderr, "Debug: Remote helper: -> %s", str);
77 if (write_in_full(fd, str, strlen(str)) != strlen(str))
78 die_errno("Full write to remote helper failed");
79}
80
c2e86add 81static const char *remove_ext_force(const char *url)
25d5cc48
IL
82{
83 if (url) {
84 const char *colon = strchr(url, ':');
85 if (colon && colon[1] == ':')
86 return colon + 2;
87 }
88 return url;
89}
90
fa8c097c
IL
91static void do_take_over(struct transport *transport)
92{
93 struct helper_data *data;
94 data = (struct helper_data *)transport->data;
95 transport_take_over(transport, data->helper);
96 fclose(data->out);
97 free(data);
98}
99
2879bc3b
MH
100static void standard_options(struct transport *t);
101
6eb996b5
DB
102static struct child_process *get_helper(struct transport *transport)
103{
104 struct helper_data *data = transport->data;
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;
6eb996b5
DB
112
113 if (data->helper)
114 return data->helper;
115
483bbd4e
RS
116 helper = xmalloc(sizeof(*helper));
117 child_process_init(helper);
6eb996b5
DB
118 helper->in = -1;
119 helper->out = -1;
120 helper->err = 0;
e0ab2ac6
JK
121 argv_array_pushf(&helper->args, "git-remote-%s", data->name);
122 argv_array_push(&helper->args, transport->remote->name);
123 argv_array_push(&helper->args, remove_ext_force(transport->url));
6b02de3b
IL
124 helper->git_cmd = 0;
125 helper->silent_exec_failure = 1;
e1735872 126
4b0c3c77
JN
127 if (have_git_dir())
128 argv_array_pushf(&helper->env_array, "%s=%s",
129 GIT_DIR_ENVIRONMENT, get_git_dir());
e1735872 130
6b02de3b
IL
131 code = start_command(helper);
132 if (code < 0 && errno == ENOENT)
133 die("Unable to find remote helper for '%s'", data->name);
134 else if (code != 0)
135 exit(code);
136
6eb996b5 137 data->helper = helper;
fa8c097c 138 data->no_disconnect_req = 0;
6eb996b5 139
61b075bd 140 /*
1a0c8dfd
JH
141 * Open the output as FILE* so strbuf_getline_*() family of
142 * functions can be used.
61b075bd
IL
143 * Do this with duped fd because fclose() will close the fd,
144 * and stuff like taking over will require the fd to remain.
61b075bd
IL
145 */
146 duped = dup(helper->out);
147 if (duped < 0)
148 die_errno("Can't dup helper output fd");
149 data->out = xfdopen(duped, "r");
150
bf3c523c 151 write_constant(helper->in, "capabilities\n");
2d14d65c 152
6eb996b5 153 while (1) {
21a2d4ad 154 const char *capname, *arg;
28ed5b35 155 int mandatory = 0;
5931b33e
FC
156 if (recvline(data, &buf))
157 exit(128);
6eb996b5
DB
158
159 if (!*buf.buf)
160 break;
28ed5b35
IL
161
162 if (*buf.buf == '*') {
163 capname = buf.buf + 1;
164 mandatory = 1;
165 } else
166 capname = buf.buf;
167
bf3c523c 168 if (debug)
28ed5b35
IL
169 fprintf(stderr, "Debug: Got cap %s\n", capname);
170 if (!strcmp(capname, "fetch"))
6eb996b5 171 data->fetch = 1;
28ed5b35 172 else if (!strcmp(capname, "option"))
ef08ef9e 173 data->option = 1;
28ed5b35 174 else if (!strcmp(capname, "push"))
ae4efe19 175 data->push = 1;
28ed5b35 176 else if (!strcmp(capname, "import"))
e65e91ed 177 data->import = 1;
bfc366d9
FA
178 else if (!strcmp(capname, "bidi-import"))
179 data->bidi_import = 1;
73b49a75
SR
180 else if (!strcmp(capname, "export"))
181 data->export = 1;
9ba38048
NTND
182 else if (!strcmp(capname, "check-connectivity"))
183 data->check_connectivity = 1;
21a2d4ad 184 else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) {
72ff8943
DB
185 ALLOC_GROW(refspecs,
186 refspec_nr + 1,
187 refspec_alloc);
21a2d4ad 188 refspecs[refspec_nr++] = xstrdup(arg);
fa8c097c
IL
189 } else if (!strcmp(capname, "connect")) {
190 data->connect = 1;
0d957a4d
JK
191 } else if (!strcmp(capname, "signed-tags")) {
192 data->signed_tags = 1;
21a2d4ad
JK
193 } else if (skip_prefix(capname, "export-marks ", &arg)) {
194 data->export_marks = xstrdup(arg);
195 } else if (skip_prefix(capname, "import-marks ", &arg)) {
196 data->import_marks = xstrdup(arg);
59556548 197 } else if (starts_with(capname, "no-private-update")) {
597b831a 198 data->no_private_update = 1;
28ed5b35 199 } else if (mandatory) {
9517e6b8 200 die("Unknown mandatory capability %s. This remote "
82247e9b 201 "helper probably needs newer version of Git.",
28ed5b35 202 capname);
72ff8943
DB
203 }
204 }
205 if (refspecs) {
206 int i;
207 data->refspec_nr = refspec_nr;
208 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
b120ef3e 209 for (i = 0; i < refspec_nr; i++)
72ff8943 210 free((char *)refspecs[i]);
72ff8943 211 free(refspecs);
a93b4a09
FC
212 } else if (data->import || data->bidi_import || data->export) {
213 warning("This remote helper should implement refspec capability.");
6eb996b5 214 }
b962dbdc 215 strbuf_release(&buf);
bf3c523c
IL
216 if (debug)
217 fprintf(stderr, "Debug: Capabilities complete.\n");
2879bc3b 218 standard_options(transport);
6eb996b5
DB
219 return data->helper;
220}
221
222static int disconnect_helper(struct transport *transport)
223{
224 struct helper_data *data = transport->data;
cc567322 225 int res = 0;
bf3c523c 226
6eb996b5 227 if (data->helper) {
bf3c523c
IL
228 if (debug)
229 fprintf(stderr, "Debug: Disconnecting.\n");
fa8c097c 230 if (!data->no_disconnect_req) {
c34fe630
JK
231 /*
232 * Ignore write errors; there's nothing we can do,
233 * since we're about to close the pipe anyway. And the
234 * most likely error is EPIPE due to the helper dying
235 * to report an error itself.
236 */
237 sigchain_push(SIGPIPE, SIG_IGN);
238 xwrite(data->helper->in, "\n", 1);
239 sigchain_pop(SIGPIPE);
fa8c097c 240 }
6eb996b5 241 close(data->helper->in);
61b075bd 242 close(data->helper->out);
292ce46b 243 fclose(data->out);
cc567322 244 res = finish_command(data->helper);
6eb996b5
DB
245 free(data->helper);
246 data->helper = NULL;
247 }
cc567322 248 return res;
6eb996b5
DB
249}
250
ef08ef9e
SP
251static const char *unsupported_options[] = {
252 TRANS_OPT_UPLOADPACK,
253 TRANS_OPT_RECEIVEPACK,
254 TRANS_OPT_THIN,
255 TRANS_OPT_KEEP
256 };
23cd01ec 257
ef08ef9e
SP
258static const char *boolean_options[] = {
259 TRANS_OPT_THIN,
260 TRANS_OPT_KEEP,
0ea47f9d 261 TRANS_OPT_FOLLOWTAGS,
cccf74e2 262 TRANS_OPT_DEEPEN_RELATIVE
ef08ef9e
SP
263 };
264
9318c5dd
NTND
265static int strbuf_set_helper_option(struct helper_data *data,
266 struct strbuf *buf)
267{
268 int ret;
269
270 sendline(data, buf);
271 if (recvline(data, buf))
272 exit(128);
273
274 if (!strcmp(buf->buf, "ok"))
275 ret = 0;
276 else if (starts_with(buf->buf, "error"))
277 ret = -1;
278 else if (!strcmp(buf->buf, "unsupported"))
279 ret = 1;
280 else {
281 warning("%s unexpectedly said: '%s'", data->name, buf->buf);
282 ret = 1;
283 }
284 return ret;
285}
286
a45a2600
NTND
287static int string_list_set_helper_option(struct helper_data *data,
288 const char *name,
289 struct string_list *list)
290{
291 struct strbuf buf = STRBUF_INIT;
292 int i, ret = 0;
293
294 for (i = 0; i < list->nr; i++) {
295 strbuf_addf(&buf, "option %s ", name);
296 quote_c_style(list->items[i].string, &buf, NULL, 0);
297 strbuf_addch(&buf, '\n');
298
299 if ((ret = strbuf_set_helper_option(data, &buf)))
300 break;
301 strbuf_reset(&buf);
302 }
303 strbuf_release(&buf);
304 return ret;
305}
306
ef08ef9e
SP
307static int set_helper_option(struct transport *transport,
308 const char *name, const char *value)
309{
310 struct helper_data *data = transport->data;
ef08ef9e
SP
311 struct strbuf buf = STRBUF_INIT;
312 int i, ret, is_bool = 0;
313
bf3c523c
IL
314 get_helper(transport);
315
ef08ef9e
SP
316 if (!data->option)
317 return 1;
318
a45a2600
NTND
319 if (!strcmp(name, "deepen-not"))
320 return string_list_set_helper_option(data, name,
321 (struct string_list *)value);
322
ef08ef9e
SP
323 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
324 if (!strcmp(name, unsupported_options[i]))
325 return 1;
326 }
327
328 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
329 if (!strcmp(name, boolean_options[i])) {
330 is_bool = 1;
331 break;
332 }
333 }
334
335 strbuf_addf(&buf, "option %s ", name);
336 if (is_bool)
337 strbuf_addstr(&buf, value ? "true" : "false");
338 else
339 quote_c_style(value, &buf, NULL, 0);
340 strbuf_addch(&buf, '\n');
341
9318c5dd 342 ret = strbuf_set_helper_option(data, &buf);
ef08ef9e
SP
343 strbuf_release(&buf);
344 return ret;
345}
346
347static void standard_options(struct transport *t)
348{
349 char buf[16];
ef08ef9e 350 int v = t->verbose;
ef08ef9e 351
d01b3c02 352 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e 353
8c5acfb9 354 xsnprintf(buf, sizeof(buf), "%d", v + 1);
ef08ef9e 355 set_helper_option(t, "verbosity", buf);
c915f11e
EW
356
357 switch (t->family) {
358 case TRANSPORT_FAMILY_ALL:
359 /*
360 * this is already the default,
361 * do not break old remote helpers by setting "all" here
362 */
363 break;
364 case TRANSPORT_FAMILY_IPV4:
365 set_helper_option(t, "family", "ipv4");
366 break;
367 case TRANSPORT_FAMILY_IPV6:
368 set_helper_option(t, "family", "ipv6");
369 break;
370 }
ef08ef9e
SP
371}
372
f2a37151
DB
373static int release_helper(struct transport *transport)
374{
cc567322 375 int res = 0;
72ff8943
DB
376 struct helper_data *data = transport->data;
377 free_refspec(data->refspec_nr, data->refspecs);
378 data->refspecs = NULL;
cc567322 379 res = disconnect_helper(transport);
f2a37151 380 free(transport->data);
cc567322 381 return res;
f2a37151
DB
382}
383
6eb996b5 384static int fetch_with_fetch(struct transport *transport,
37148311 385 int nr_heads, struct ref **to_fetch)
6eb996b5 386{
292ce46b 387 struct helper_data *data = transport->data;
6eb996b5
DB
388 int i;
389 struct strbuf buf = STRBUF_INIT;
390
391 for (i = 0; i < nr_heads; i++) {
1088261f 392 const struct ref *posn = to_fetch[i];
6eb996b5
DB
393 if (posn->status & REF_STATUS_UPTODATE)
394 continue;
2d14d65c
DB
395
396 strbuf_addf(&buf, "fetch %s %s\n",
f4e54d02 397 oid_to_hex(&posn->old_oid),
33cae542 398 posn->symref ? posn->symref : posn->name);
292ce46b 399 }
2d14d65c 400
292ce46b 401 strbuf_addch(&buf, '\n');
bf3c523c 402 sendline(data, &buf);
292ce46b
SP
403
404 while (1) {
5931b33e
FC
405 if (recvline(data, &buf))
406 exit(128);
292ce46b 407
59556548 408 if (starts_with(buf.buf, "lock ")) {
292ce46b
SP
409 const char *name = buf.buf + 5;
410 if (transport->pack_lockfile)
411 warning("%s also locked %s", data->name, name);
412 else
413 transport->pack_lockfile = xstrdup(name);
414 }
9ba38048
NTND
415 else if (data->check_connectivity &&
416 data->transport_options.check_self_contained_and_connected &&
417 !strcmp(buf.buf, "connectivity-ok"))
418 data->transport_options.self_contained_and_connected = 1;
292ce46b
SP
419 else if (!buf.len)
420 break;
421 else
422 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 423 }
292ce46b 424 strbuf_release(&buf);
6eb996b5
DB
425 return 0;
426}
427
e65e91ed
DB
428static int get_importer(struct transport *transport, struct child_process *fastimport)
429{
430 struct child_process *helper = get_helper(transport);
bfc366d9 431 struct helper_data *data = transport->data;
bfc366d9 432 int cat_blob_fd, code;
483bbd4e 433 child_process_init(fastimport);
e65e91ed 434 fastimport->in = helper->out;
173fd1a1
JK
435 argv_array_push(&fastimport->args, "fast-import");
436 argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
e65e91ed 437
bfc366d9
FA
438 if (data->bidi_import) {
439 cat_blob_fd = xdup(helper->in);
173fd1a1 440 argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
bfc366d9 441 }
e65e91ed 442 fastimport->git_cmd = 1;
bfc366d9
FA
443
444 code = start_command(fastimport);
445 return code;
e65e91ed
DB
446}
447
73b49a75
SR
448static int get_exporter(struct transport *transport,
449 struct child_process *fastexport,
73b49a75
SR
450 struct string_list *revlist_args)
451{
a515ebe9 452 struct helper_data *data = transport->data;
73b49a75 453 struct child_process *helper = get_helper(transport);
2aeae40a 454 int i;
852e54bc 455
8828f298 456 child_process_init(fastexport);
73b49a75
SR
457
458 /* we need to duplicate helper->in because we want to use it after
459 * fastexport is done with it. */
460 fastexport->out = dup(helper->in);
2aeae40a
JK
461 argv_array_push(&fastexport->args, "fast-export");
462 argv_array_push(&fastexport->args, "--use-done-feature");
463 argv_array_push(&fastexport->args, data->signed_tags ?
464 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
465 if (data->export_marks)
466 argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
467 if (data->import_marks)
468 argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
73b49a75
SR
469
470 for (i = 0; i < revlist_args->nr; i++)
2aeae40a 471 argv_array_push(&fastexport->args, revlist_args->items[i].string);
73b49a75
SR
472
473 fastexport->git_cmd = 1;
474 return start_command(fastexport);
475}
476
e65e91ed
DB
477static int fetch_with_import(struct transport *transport,
478 int nr_heads, struct ref **to_fetch)
479{
480 struct child_process fastimport;
72ff8943 481 struct helper_data *data = transport->data;
e65e91ed
DB
482 int i;
483 struct ref *posn;
484 struct strbuf buf = STRBUF_INIT;
485
bf3c523c
IL
486 get_helper(transport);
487
e65e91ed
DB
488 if (get_importer(transport, &fastimport))
489 die("Couldn't run fast-import");
490
491 for (i = 0; i < nr_heads; i++) {
492 posn = to_fetch[i];
493 if (posn->status & REF_STATUS_UPTODATE)
494 continue;
495
33cae542
MH
496 strbuf_addf(&buf, "import %s\n",
497 posn->symref ? posn->symref : posn->name);
bf3c523c 498 sendline(data, &buf);
e65e91ed
DB
499 strbuf_reset(&buf);
500 }
9504bc9d
SR
501
502 write_constant(data->helper->in, "\n");
bfc366d9
FA
503 /*
504 * remote-helpers that advertise the bidi-import capability are required to
505 * buffer the complete batch of import commands until this newline before
506 * sending data to fast-import.
507 * These helpers read back data from fast-import on their stdin, which could
508 * be mixed with import commands, otherwise.
509 */
9504bc9d 510
cc567322
SR
511 if (finish_command(&fastimport))
512 die("Error while running fast-import");
e65e91ed 513
dff9d65d
FA
514 /*
515 * The fast-import stream of a remote helper that advertises
516 * the "refspec" capability writes to the refs named after the
517 * right hand side of the first refspec matching each ref we
518 * were fetching.
519 *
520 * (If no "refspec" capability was specified, for historical
7a43c554 521 * reasons we default to the equivalent of *:*.)
dff9d65d
FA
522 *
523 * Store the result in to_fetch[i].old_sha1. Callers such
524 * as "git fetch" can use the value to write feedback to the
525 * terminal, populate FETCH_HEAD, and determine what new value
526 * should be written to peer_ref if the update is a
527 * fast-forward or this is a forced update.
528 */
e65e91ed 529 for (i = 0; i < nr_heads; i++) {
33cae542 530 char *private, *name;
e65e91ed
DB
531 posn = to_fetch[i];
532 if (posn->status & REF_STATUS_UPTODATE)
533 continue;
33cae542 534 name = posn->symref ? posn->symref : posn->name;
72ff8943 535 if (data->refspecs)
33cae542 536 private = apply_refspecs(data->refspecs, data->refspec_nr, name);
72ff8943 537 else
33cae542 538 private = xstrdup(name);
d51b720f 539 if (private) {
f4e54d02 540 if (read_ref(private, posn->old_oid.hash) < 0)
ae25fd39 541 die("Could not read ref %s", private);
d51b720f
MH
542 free(private);
543 }
e65e91ed 544 }
b962dbdc 545 strbuf_release(&buf);
e65e91ed
DB
546 return 0;
547}
548
fa8c097c
IL
549static int process_connect_service(struct transport *transport,
550 const char *name, const char *exec)
551{
552 struct helper_data *data = transport->data;
553 struct strbuf cmdbuf = STRBUF_INIT;
554 struct child_process *helper;
555 int r, duped, ret = 0;
556 FILE *input;
557
558 helper = get_helper(transport);
559
560 /*
561 * Yes, dup the pipe another time, as we need unbuffered version
562 * of input pipe as FILE*. fclose() closes the underlying fd and
563 * stream buffering only can be changed before first I/O operation
564 * on it.
565 */
566 duped = dup(helper->out);
567 if (duped < 0)
568 die_errno("Can't dup helper output fd");
569 input = xfdopen(duped, "r");
570 setvbuf(input, NULL, _IONBF, 0);
571
572 /*
573 * Handle --upload-pack and friends. This is fire and forget...
574 * just warn if it fails.
575 */
576 if (strcmp(name, exec)) {
577 r = set_helper_option(transport, "servpath", exec);
578 if (r > 0)
579 warning("Setting remote service path not supported by protocol.");
580 else if (r < 0)
581 warning("Invalid remote service path.");
582 }
583
584 if (data->connect)
585 strbuf_addf(&cmdbuf, "connect %s\n", name);
586 else
587 goto exit;
588
589 sendline(data, &cmdbuf);
5931b33e
FC
590 if (recvline_fh(input, &cmdbuf, name))
591 exit(128);
592
fa8c097c
IL
593 if (!strcmp(cmdbuf.buf, "")) {
594 data->no_disconnect_req = 1;
595 if (debug)
596 fprintf(stderr, "Debug: Smart transport connection "
597 "ready.\n");
598 ret = 1;
599 } else if (!strcmp(cmdbuf.buf, "fallback")) {
600 if (debug)
601 fprintf(stderr, "Debug: Falling back to dumb "
602 "transport.\n");
603 } else
604 die("Unknown response to connect: %s",
605 cmdbuf.buf);
606
607exit:
608 fclose(input);
609 return ret;
610}
611
612static int process_connect(struct transport *transport,
613 int for_push)
614{
615 struct helper_data *data = transport->data;
616 const char *name;
617 const char *exec;
618
619 name = for_push ? "git-receive-pack" : "git-upload-pack";
620 if (for_push)
621 exec = data->transport_options.receivepack;
622 else
623 exec = data->transport_options.uploadpack;
624
625 return process_connect_service(transport, name, exec);
626}
627
b236752a
IL
628static int connect_helper(struct transport *transport, const char *name,
629 const char *exec, int fd[2])
630{
631 struct helper_data *data = transport->data;
632
633 /* Get_helper so connect is inited. */
634 get_helper(transport);
635 if (!data->connect)
636 die("Operation not supported by protocol.");
637
638 if (!process_connect_service(transport, name, exec))
639 die("Can't connect to subservice %s.", name);
640
641 fd[0] = data->helper->out;
642 fd[1] = data->helper->in;
643 return 0;
644}
645
6eb996b5 646static int fetch(struct transport *transport,
37148311 647 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
648{
649 struct helper_data *data = transport->data;
650 int i, count;
651
fa8c097c
IL
652 if (process_connect(transport, 0)) {
653 do_take_over(transport);
654 return transport->fetch(transport, nr_heads, to_fetch);
655 }
656
6eb996b5
DB
657 count = 0;
658 for (i = 0; i < nr_heads; i++)
659 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
660 count++;
661
662 if (!count)
663 return 0;
664
aab1beb0
MH
665 if (data->check_connectivity &&
666 data->transport_options.check_self_contained_and_connected)
667 set_helper_option(transport, "check-connectivity", "true");
668
669 if (transport->cloning)
670 set_helper_option(transport, "cloning", "true");
671
672 if (data->transport_options.update_shallow)
673 set_helper_option(transport, "update-shallow", "true");
674
6eb996b5
DB
675 if (data->fetch)
676 return fetch_with_fetch(transport, nr_heads, to_fetch);
677
e65e91ed
DB
678 if (data->import)
679 return fetch_with_import(transport, nr_heads, to_fetch);
680
6eb996b5
DB
681 return -1;
682}
683
664059fb 684static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
685 struct ref **ref,
686 struct ref *remote_refs)
687{
688 char *refname, *msg;
f9e3c6be 689 int status, forced = 0;
d2e73c6f 690
59556548 691 if (starts_with(buf->buf, "ok ")) {
d2e73c6f
SR
692 status = REF_STATUS_OK;
693 refname = buf->buf + 3;
59556548 694 } else if (starts_with(buf->buf, "error ")) {
d2e73c6f
SR
695 status = REF_STATUS_REMOTE_REJECT;
696 refname = buf->buf + 6;
697 } else
82247e9b 698 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
699
700 msg = strchr(refname, ' ');
701 if (msg) {
702 struct strbuf msg_buf = STRBUF_INIT;
703 const char *end;
704
705 *msg++ = '\0';
706 if (!unquote_c_style(&msg_buf, msg, &end))
707 msg = strbuf_detach(&msg_buf, NULL);
708 else
709 msg = xstrdup(msg);
710 strbuf_release(&msg_buf);
711
712 if (!strcmp(msg, "no match")) {
713 status = REF_STATUS_NONE;
714 free(msg);
715 msg = NULL;
716 }
717 else if (!strcmp(msg, "up to date")) {
718 status = REF_STATUS_UPTODATE;
719 free(msg);
720 msg = NULL;
721 }
722 else if (!strcmp(msg, "non-fast forward")) {
723 status = REF_STATUS_REJECT_NONFASTFORWARD;
724 free(msg);
725 msg = NULL;
726 }
dbfeddb1
CR
727 else if (!strcmp(msg, "already exists")) {
728 status = REF_STATUS_REJECT_ALREADY_EXISTS;
729 free(msg);
730 msg = NULL;
731 }
75e5c0dc
JH
732 else if (!strcmp(msg, "fetch first")) {
733 status = REF_STATUS_REJECT_FETCH_FIRST;
734 free(msg);
735 msg = NULL;
736 }
737 else if (!strcmp(msg, "needs force")) {
738 status = REF_STATUS_REJECT_NEEDS_FORCE;
739 free(msg);
740 msg = NULL;
741 }
631b5ef2
JH
742 else if (!strcmp(msg, "stale info")) {
743 status = REF_STATUS_REJECT_STALE;
744 free(msg);
745 msg = NULL;
746 }
f9e3c6be
FC
747 else if (!strcmp(msg, "forced update")) {
748 forced = 1;
749 free(msg);
750 msg = NULL;
751 }
d2e73c6f
SR
752 }
753
754 if (*ref)
755 *ref = find_ref_by_name(*ref, refname);
756 if (!*ref)
757 *ref = find_ref_by_name(remote_refs, refname);
758 if (!*ref) {
759 warning("helper reported unexpected status of %s", refname);
664059fb 760 return 1;
d2e73c6f
SR
761 }
762
763 if ((*ref)->status != REF_STATUS_NONE) {
764 /*
765 * Earlier, the ref was marked not to be pushed, so ignore the ref
766 * status reported by the remote helper if the latter is 'no match'.
767 */
768 if (status == REF_STATUS_NONE)
664059fb 769 return 1;
d2e73c6f
SR
770 }
771
772 (*ref)->status = status;
cf31f70c 773 (*ref)->forced_update |= forced;
d2e73c6f 774 (*ref)->remote_status = msg;
126aac5c 775 return !(status == REF_STATUS_OK);
d2e73c6f
SR
776}
777
0551a06c 778static int push_update_refs_status(struct helper_data *data,
5a75353f
FC
779 struct ref *remote_refs,
780 int flags)
d2e73c6f
SR
781{
782 struct strbuf buf = STRBUF_INIT;
783 struct ref *ref = remote_refs;
0551a06c
FC
784 int ret = 0;
785
d2e73c6f 786 for (;;) {
664059fb
FC
787 char *private;
788
0551a06c
FC
789 if (recvline(data, &buf)) {
790 ret = 1;
791 break;
792 }
793
d2e73c6f
SR
794 if (!buf.len)
795 break;
796
664059fb
FC
797 if (push_update_ref_status(&buf, &ref, remote_refs))
798 continue;
799
5a75353f 800 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
664059fb
FC
801 continue;
802
803 /* propagate back the update to the remote namespace */
804 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
805 if (!private)
806 continue;
f4e54d02 807 update_ref("update by helper", private, ref->new_oid.hash, NULL, 0, 0);
664059fb 808 free(private);
d2e73c6f
SR
809 }
810 strbuf_release(&buf);
0551a06c 811 return ret;
d2e73c6f
SR
812}
813
30261094
DB
814static void set_common_push_options(struct transport *transport,
815 const char *name, int flags)
816{
817 if (flags & TRANSPORT_PUSH_DRY_RUN) {
818 if (set_helper_option(transport, "dry-run", "true") != 0)
819 die("helper %s does not support dry-run", name);
820 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
821 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
822 die("helper %s does not support --signed", name);
823 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
824 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
825 die("helper %s does not support --signed=if-asked", name);
826 }
438fc684
SB
827
828 if (flags & TRANSPORT_PUSH_OPTIONS) {
829 struct string_list_item *item;
830 for_each_string_list_item(item, transport->push_options)
831 if (set_helper_option(transport, "push-option", item->string) != 0)
832 die("helper %s does not support 'push-option'", name);
833 }
30261094
DB
834}
835
73b49a75 836static int push_refs_with_push(struct transport *transport,
05c1eb10 837 struct ref *remote_refs, int flags)
ae4efe19
SP
838{
839 int force_all = flags & TRANSPORT_PUSH_FORCE;
840 int mirror = flags & TRANSPORT_PUSH_MIRROR;
841 struct helper_data *data = transport->data;
842 struct strbuf buf = STRBUF_INIT;
ae4efe19 843 struct ref *ref;
05c1eb10
JH
844 struct string_list cas_options = STRING_LIST_INIT_DUP;
845 struct string_list_item *cas_option;
ae4efe19 846
c0aa335c 847 get_helper(transport);
ae4efe19
SP
848 if (!data->push)
849 return 1;
850
851 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 852 if (!ref->peer_ref && !mirror)
ae4efe19
SP
853 continue;
854
20e8b465
TRC
855 /* Check for statuses set by set_ref_status_for_push() */
856 switch (ref->status) {
857 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 858 case REF_STATUS_REJECT_STALE:
dbfeddb1 859 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 860 case REF_STATUS_UPTODATE:
ae4efe19 861 continue;
20e8b465
TRC
862 default:
863 ; /* do nothing */
ae4efe19
SP
864 }
865
866 if (force_all)
867 ref->force = 1;
868
869 strbuf_addstr(&buf, "push ");
870 if (!ref->deletion) {
871 if (ref->force)
872 strbuf_addch(&buf, '+');
873 if (ref->peer_ref)
874 strbuf_addstr(&buf, ref->peer_ref->name);
875 else
f4e54d02 876 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
ae4efe19
SP
877 }
878 strbuf_addch(&buf, ':');
879 strbuf_addstr(&buf, ref->name);
880 strbuf_addch(&buf, '\n');
05c1eb10
JH
881
882 /*
883 * The "--force-with-lease" options without explicit
884 * values to expect have already been expanded into
f4e54d02 885 * the ref->old_oid_expect[] field; we can ignore
05c1eb10
JH
886 * transport->smart_options->cas altogether and instead
887 * can enumerate them from the refs.
888 */
889 if (ref->expect_old_sha1) {
890 struct strbuf cas = STRBUF_INIT;
891 strbuf_addf(&cas, "%s:%s",
f4e54d02 892 ref->name, oid_to_hex(&ref->old_oid_expect));
05c1eb10
JH
893 string_list_append(&cas_options, strbuf_detach(&cas, NULL));
894 }
ae4efe19 895 }
05c1eb10
JH
896 if (buf.len == 0) {
897 string_list_clear(&cas_options, 0);
d8f67d20 898 return 0;
05c1eb10 899 }
ae4efe19 900
05c1eb10
JH
901 for_each_string_list_item(cas_option, &cas_options)
902 set_helper_option(transport, "cas", cas_option->string);
30261094 903 set_common_push_options(transport, data->name, flags);
ae4efe19
SP
904
905 strbuf_addch(&buf, '\n');
bf3c523c 906 sendline(data, &buf);
ae4efe19 907 strbuf_release(&buf);
d2e73c6f 908
0551a06c 909 return push_update_refs_status(data, remote_refs, flags);
ae4efe19
SP
910}
911
73b49a75
SR
912static int push_refs_with_export(struct transport *transport,
913 struct ref *remote_refs, int flags)
914{
915 struct ref *ref;
916 struct child_process *helper, exporter;
917 struct helper_data *data = transport->data;
d98c8153 918 struct string_list revlist_args = STRING_LIST_INIT_DUP;
73b49a75
SR
919 struct strbuf buf = STRBUF_INIT;
920
21610d82
FC
921 if (!data->refspecs)
922 die("remote-helper doesn't support push; refspec needed");
923
30261094 924 set_common_push_options(transport, data->name, flags);
510fa6f5
FC
925 if (flags & TRANSPORT_PUSH_FORCE) {
926 if (set_helper_option(transport, "force", "true") != 0)
927 warning("helper %s does not support 'force'", data->name);
928 }
929
73b49a75
SR
930 helper = get_helper(transport);
931
932 write_constant(helper->in, "export\n");
933
73b49a75
SR
934 for (ref = remote_refs; ref; ref = ref->next) {
935 char *private;
27912a03 936 struct object_id oid;
73b49a75 937
73b49a75 938 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
27912a03 939 if (private && !get_sha1(private, oid.hash)) {
73b49a75 940 strbuf_addf(&buf, "^%s", private);
1d2f80fa 941 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
27912a03 942 oidcpy(&ref->old_oid, &oid);
73b49a75 943 }
2faa1527 944 free(private);
73b49a75 945
67c9c782 946 if (ref->peer_ref) {
d98c8153 947 if (strcmp(ref->name, ref->peer_ref->name)) {
f3d03763
FC
948 if (!ref->deletion) {
949 const char *name;
950 int flag;
951
952 /* Follow symbolic refs (mainly for HEAD). */
7695d118
RS
953 name = resolve_ref_unsafe(
954 ref->peer_ref->name,
955 RESOLVE_REF_READING,
27912a03 956 oid.hash, &flag);
f3d03763
FC
957 if (!name || !(flag & REF_ISSYMREF))
958 name = ref->peer_ref->name;
9193f742 959
f3d03763
FC
960 strbuf_addf(&buf, "%s:%s", name, ref->name);
961 } else
962 strbuf_addf(&buf, ":%s", ref->name);
9193f742 963
d98c8153
FC
964 string_list_append(&revlist_args, "--refspec");
965 string_list_append(&revlist_args, buf.buf);
966 strbuf_release(&buf);
967 }
f3d03763
FC
968 if (!ref->deletion)
969 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 970 }
73b49a75
SR
971 }
972
a515ebe9 973 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
974 die("Couldn't run fast-export");
975
d98c8153
FC
976 string_list_clear(&revlist_args, 1);
977
cc567322
SR
978 if (finish_command(&exporter))
979 die("Error while running fast-export");
3994e64d
FC
980 if (push_update_refs_status(data, remote_refs, flags))
981 return 1;
982
983 if (data->export_marks) {
984 strbuf_addf(&buf, "%s.tmp", data->export_marks);
985 rename(buf.buf, data->export_marks);
986 strbuf_release(&buf);
987 }
988
989 return 0;
73b49a75
SR
990}
991
992static int push_refs(struct transport *transport,
993 struct ref *remote_refs, int flags)
994{
995 struct helper_data *data = transport->data;
996
997 if (process_connect(transport, 1)) {
998 do_take_over(transport);
999 return transport->push_refs(transport, remote_refs, flags);
1000 }
1001
1002 if (!remote_refs) {
1003 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
1004 "Perhaps you should specify a branch such as 'master'.\n");
1005 return 0;
1006 }
1007
1008 if (data->push)
1009 return push_refs_with_push(transport, remote_refs, flags);
1010
1011 if (data->export)
1012 return push_refs_with_export(transport, remote_refs, flags);
1013
1014 return -1;
1015}
1016
1017
f8ec9167
DB
1018static int has_attribute(const char *attrs, const char *attr) {
1019 int len;
1020 if (!attrs)
1021 return 0;
1022
1023 len = strlen(attr);
1024 for (;;) {
1025 const char *space = strchrnul(attrs, ' ');
1026 if (len == space - attrs && !strncmp(attrs, attr, len))
1027 return 1;
1028 if (!*space)
1029 return 0;
1030 attrs = space + 1;
1031 }
1032}
1033
6eb996b5
DB
1034static struct ref *get_refs_list(struct transport *transport, int for_push)
1035{
292ce46b 1036 struct helper_data *data = transport->data;
6eb996b5
DB
1037 struct child_process *helper;
1038 struct ref *ret = NULL;
1039 struct ref **tail = &ret;
1040 struct ref *posn;
1041 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
1042
1043 helper = get_helper(transport);
2d14d65c 1044
fa8c097c
IL
1045 if (process_connect(transport, for_push)) {
1046 do_take_over(transport);
1047 return transport->get_refs_list(transport, for_push);
1048 }
1049
ae4efe19
SP
1050 if (data->push && for_push)
1051 write_str_in_full(helper->in, "list for-push\n");
1052 else
1053 write_str_in_full(helper->in, "list\n");
6eb996b5 1054
6eb996b5
DB
1055 while (1) {
1056 char *eov, *eon;
5931b33e
FC
1057 if (recvline(data, &buf))
1058 exit(128);
6eb996b5
DB
1059
1060 if (!*buf.buf)
1061 break;
1062
1063 eov = strchr(buf.buf, ' ');
1064 if (!eov)
1065 die("Malformed response in ref list: %s", buf.buf);
1066 eon = strchr(eov + 1, ' ');
1067 *eov = '\0';
1068 if (eon)
1069 *eon = '\0';
1070 *tail = alloc_ref(eov + 1);
1071 if (buf.buf[0] == '@')
1072 (*tail)->symref = xstrdup(buf.buf + 1);
1073 else if (buf.buf[0] != '?')
f4e54d02 1074 get_oid_hex(buf.buf, &(*tail)->old_oid);
f8ec9167
DB
1075 if (eon) {
1076 if (has_attribute(eon + 1, "unchanged")) {
1077 (*tail)->status |= REF_STATUS_UPTODATE;
ae25fd39 1078 if (read_ref((*tail)->name,
f4e54d02 1079 (*tail)->old_oid.hash) < 0)
3c5077fe 1080 die(_("Could not read ref %s"),
ae25fd39 1081 (*tail)->name);
f8ec9167
DB
1082 }
1083 }
6eb996b5
DB
1084 tail = &((*tail)->next);
1085 }
bf3c523c
IL
1086 if (debug)
1087 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
1088 strbuf_release(&buf);
1089
1090 for (posn = ret; posn; posn = posn->next)
1091 resolve_remote_symref(posn, ret);
1092
1093 return ret;
1094}
1095
c9e388bb 1096int transport_helper_init(struct transport *transport, const char *name)
6eb996b5 1097{
92e25b6b 1098 struct helper_data *data = xcalloc(1, sizeof(*data));
c9e388bb 1099 data->name = name;
6eb996b5 1100
a5adaced
JK
1101 transport_check_allowed(name);
1102
bf3c523c
IL
1103 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1104 debug = 1;
1105
6eb996b5 1106 transport->data = data;
ef08ef9e 1107 transport->set_option = set_helper_option;
6eb996b5
DB
1108 transport->get_refs_list = get_refs_list;
1109 transport->fetch = fetch;
ae4efe19 1110 transport->push_refs = push_refs;
f2a37151 1111 transport->disconnect = release_helper;
b236752a 1112 transport->connect = connect_helper;
61b075bd 1113 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1114 return 0;
1115}
419f37db
IL
1116
1117/*
1118 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1119 * buffer less), so attempt reads and writes with up to that size.
1120 */
1121#define BUFFERSIZE 65536
1122/* This should be enough to hold debugging message. */
1123#define PBUFFERSIZE 8192
1124
1125/* Print bidirectional transfer loop debug message. */
4621085b 1126__attribute__((format (printf, 1, 2)))
419f37db
IL
1127static void transfer_debug(const char *fmt, ...)
1128{
1129 va_list args;
1130 char msgbuf[PBUFFERSIZE];
1131 static int debug_enabled = -1;
1132
1133 if (debug_enabled < 0)
1134 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1135 if (!debug_enabled)
1136 return;
1137
1138 va_start(args, fmt);
1139 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1140 va_end(args);
1141 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1142}
1143
1144/* Stream state: More data may be coming in this direction. */
2e3a16b2 1145#define SSTATE_TRANSFERRING 0
419f37db
IL
1146/*
1147 * Stream state: No more data coming in this direction, flushing rest of
1148 * data.
1149 */
1150#define SSTATE_FLUSHING 1
1151/* Stream state: Transfer in this direction finished. */
1152#define SSTATE_FINISHED 2
1153
2e3a16b2 1154#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
419f37db
IL
1155#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1156#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1157
1158/* Unidirectional transfer. */
1159struct unidirectional_transfer {
1160 /* Source */
1161 int src;
1162 /* Destination */
1163 int dest;
1164 /* Is source socket? */
1165 int src_is_sock;
1166 /* Is destination socket? */
1167 int dest_is_sock;
41ccfdd9 1168 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1169 int state;
1170 /* Buffer. */
1171 char buf[BUFFERSIZE];
1172 /* Buffer used. */
1173 size_t bufuse;
1174 /* Name of source. */
1175 const char *src_name;
1176 /* Name of destination. */
1177 const char *dest_name;
1178};
1179
1180/* Closes the target (for writing) if transfer has finished. */
1181static void udt_close_if_finished(struct unidirectional_transfer *t)
1182{
1183 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1184 t->state = SSTATE_FINISHED;
1185 if (t->dest_is_sock)
1186 shutdown(t->dest, SHUT_WR);
1187 else
1188 close(t->dest);
1189 transfer_debug("Closed %s.", t->dest_name);
1190 }
1191}
1192
1193/*
832c0e5e 1194 * Tries to read data from source into buffer. If buffer is full,
419f37db
IL
1195 * no data is read. Returns 0 on success, -1 on error.
1196 */
1197static int udt_do_read(struct unidirectional_transfer *t)
1198{
1199 ssize_t bytes;
1200
1201 if (t->bufuse == BUFFERSIZE)
1202 return 0; /* No space for more. */
1203
1204 transfer_debug("%s is readable", t->src_name);
1205 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1206 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1207 errno != EINTR) {
1fee1dce 1208 error_errno("read(%s) failed", t->src_name);
419f37db
IL
1209 return -1;
1210 } else if (bytes == 0) {
1211 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1212 t->src_name, (int)t->bufuse);
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1213 t->state = SSTATE_FLUSHING;
1214 } else if (bytes > 0) {
1215 t->bufuse += bytes;
1216 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1217 (int)bytes, t->src_name, (int)t->bufuse);
1218 }
1219 return 0;
1220}
1221
1222/* Tries to write data from buffer into destination. If buffer is empty,
1223 * no data is written. Returns 0 on success, -1 on error.
1224 */
1225static int udt_do_write(struct unidirectional_transfer *t)
1226{
803dbdb9 1227 ssize_t bytes;
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IL
1228
1229 if (t->bufuse == 0)
1230 return 0; /* Nothing to write. */
1231
1232 transfer_debug("%s is writable", t->dest_name);
7edc02f4
EFL
1233 bytes = xwrite(t->dest, t->buf, t->bufuse);
1234 if (bytes < 0 && errno != EWOULDBLOCK) {
1fee1dce 1235 error_errno("write(%s) failed", t->dest_name);
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IL
1236 return -1;
1237 } else if (bytes > 0) {
1238 t->bufuse -= bytes;
1239 if (t->bufuse)
1240 memmove(t->buf, t->buf + bytes, t->bufuse);
1241 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1242 (int)bytes, t->dest_name, (int)t->bufuse);
1243 }
1244 return 0;
1245}
1246
1247
1248/* State of bidirectional transfer loop. */
1249struct bidirectional_transfer_state {
1250 /* Direction from program to git. */
1251 struct unidirectional_transfer ptg;
1252 /* Direction from git to program. */
1253 struct unidirectional_transfer gtp;
1254};
1255
1256static void *udt_copy_task_routine(void *udt)
1257{
1258 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1259 while (t->state != SSTATE_FINISHED) {
1260 if (STATE_NEEDS_READING(t->state))
1261 if (udt_do_read(t))
1262 return NULL;
1263 if (STATE_NEEDS_WRITING(t->state))
1264 if (udt_do_write(t))
1265 return NULL;
1266 if (STATE_NEEDS_CLOSING(t->state))
1267 udt_close_if_finished(t);
1268 }
1269 return udt; /* Just some non-NULL value. */
1270}
1271
1272#ifndef NO_PTHREADS
1273
1274/*
98e023de 1275 * Join thread, with appropriate errors on failure. Name is name for the
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1276 * thread (for error messages). Returns 0 on success, 1 on failure.
1277 */
1278static int tloop_join(pthread_t thread, const char *name)
1279{
1280 int err;
1281 void *tret;
1282 err = pthread_join(thread, &tret);
1283 if (!tret) {
1284 error("%s thread failed", name);
1285 return 1;
1286 }
1287 if (err) {
1288 error("%s thread failed to join: %s", name, strerror(err));
1289 return 1;
1290 }
1291 return 0;
1292}
1293
1294/*
1295 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1296 * -1 on failure.
1297 */
1298static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1299{
1300 pthread_t gtp_thread;
1301 pthread_t ptg_thread;
1302 int err;
1303 int ret = 0;
1304 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1305 &s->gtp);
1306 if (err)
1307 die("Can't start thread for copying data: %s", strerror(err));
1308 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1309 &s->ptg);
1310 if (err)
1311 die("Can't start thread for copying data: %s", strerror(err));
1312
1313 ret |= tloop_join(gtp_thread, "Git to program copy");
1314 ret |= tloop_join(ptg_thread, "Program to git copy");
1315 return ret;
1316}
1317#else
1318
1319/* Close the source and target (for writing) for transfer. */
1320static void udt_kill_transfer(struct unidirectional_transfer *t)
1321{
1322 t->state = SSTATE_FINISHED;
1323 /*
1324 * Socket read end left open isn't a disaster if nobody
1325 * attempts to read from it (mingw compat headers do not
1326 * have SHUT_RD)...
1327 *
1328 * We can't fully close the socket since otherwise gtp
1329 * task would first close the socket it sends data to
1330 * while closing the ptg file descriptors.
1331 */
1332 if (!t->src_is_sock)
1333 close(t->src);
1334 if (t->dest_is_sock)
1335 shutdown(t->dest, SHUT_WR);
1336 else
1337 close(t->dest);
1338}
1339
1340/*
98e023de 1341 * Join process, with appropriate errors on failure. Name is name for the
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1342 * process (for error messages). Returns 0 on success, 1 on failure.
1343 */
1344static int tloop_join(pid_t pid, const char *name)
1345{
1346 int tret;
1347 if (waitpid(pid, &tret, 0) < 0) {
1fee1dce 1348 error_errno("%s process failed to wait", name);
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IL
1349 return 1;
1350 }
1351 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1352 error("%s process failed", name);
1353 return 1;
1354 }
1355 return 0;
1356}
1357
1358/*
1359 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1360 * -1 on failure.
1361 */
1362static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1363{
1364 pid_t pid1, pid2;
1365 int ret = 0;
1366
1367 /* Fork thread #1: git to program. */
1368 pid1 = fork();
1369 if (pid1 < 0)
1370 die_errno("Can't start thread for copying data");
1371 else if (pid1 == 0) {
1372 udt_kill_transfer(&s->ptg);
1373 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1374 }
1375
1376 /* Fork thread #2: program to git. */
1377 pid2 = fork();
1378 if (pid2 < 0)
1379 die_errno("Can't start thread for copying data");
1380 else if (pid2 == 0) {
1381 udt_kill_transfer(&s->gtp);
1382 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1383 }
1384
1385 /*
1386 * Close both streams in parent as to not interfere with
1387 * end of file detection and wait for both tasks to finish.
1388 */
1389 udt_kill_transfer(&s->gtp);
1390 udt_kill_transfer(&s->ptg);
1391 ret |= tloop_join(pid1, "Git to program copy");
1392 ret |= tloop_join(pid2, "Program to git copy");
1393 return ret;
1394}
1395#endif
1396
1397/*
1398 * Copies data from stdin to output and from input to stdout simultaneously.
1399 * Additionally filtering through given filter. If filter is NULL, uses
1400 * identity filter.
1401 */
1402int bidirectional_transfer_loop(int input, int output)
1403{
1404 struct bidirectional_transfer_state state;
1405
1406 /* Fill the state fields. */
1407 state.ptg.src = input;
1408 state.ptg.dest = 1;
1409 state.ptg.src_is_sock = (input == output);
1410 state.ptg.dest_is_sock = 0;
2e3a16b2 1411 state.ptg.state = SSTATE_TRANSFERRING;
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1412 state.ptg.bufuse = 0;
1413 state.ptg.src_name = "remote input";
1414 state.ptg.dest_name = "stdout";
1415
1416 state.gtp.src = 0;
1417 state.gtp.dest = output;
1418 state.gtp.src_is_sock = 0;
1419 state.gtp.dest_is_sock = (input == output);
2e3a16b2 1420 state.gtp.state = SSTATE_TRANSFERRING;
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1421 state.gtp.bufuse = 0;
1422 state.gtp.src_name = "stdin";
1423 state.gtp.dest_name = "remote output";
1424
1425 return tloop_spawnwait_tasks(&state);
1426}