transport-helper: refactor process_connect_service
[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"
e967ca38 14#include "transport-internal.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);
06f46f23 48 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
bf3c523c
IL
49 die_errno("Full write to remote helper failed");
50}
51
b1c2edfc 52static int recvline_fh(FILE *helper, struct strbuf *buffer)
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{
b1c2edfc 70 return recvline_fh(helper->out, buffer);
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);
06f46f23 77 if (write_in_full(fd, str, strlen(str)) < 0)
bf3c523c
IL
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);
6a83d902 245 FREE_AND_NULL(data->helper);
6eb996b5 246 }
cc567322 247 return res;
6eb996b5
DB
248}
249
ef08ef9e
SP
250static const char *unsupported_options[] = {
251 TRANS_OPT_UPLOADPACK,
252 TRANS_OPT_RECEIVEPACK,
253 TRANS_OPT_THIN,
254 TRANS_OPT_KEEP
255 };
23cd01ec 256
ef08ef9e
SP
257static const char *boolean_options[] = {
258 TRANS_OPT_THIN,
259 TRANS_OPT_KEEP,
0ea47f9d 260 TRANS_OPT_FOLLOWTAGS,
cccf74e2 261 TRANS_OPT_DEEPEN_RELATIVE
ef08ef9e
SP
262 };
263
9318c5dd
NTND
264static int strbuf_set_helper_option(struct helper_data *data,
265 struct strbuf *buf)
266{
267 int ret;
268
269 sendline(data, buf);
270 if (recvline(data, buf))
271 exit(128);
272
273 if (!strcmp(buf->buf, "ok"))
274 ret = 0;
275 else if (starts_with(buf->buf, "error"))
276 ret = -1;
277 else if (!strcmp(buf->buf, "unsupported"))
278 ret = 1;
279 else {
280 warning("%s unexpectedly said: '%s'", data->name, buf->buf);
281 ret = 1;
282 }
283 return ret;
284}
285
a45a2600
NTND
286static int string_list_set_helper_option(struct helper_data *data,
287 const char *name,
288 struct string_list *list)
289{
290 struct strbuf buf = STRBUF_INIT;
291 int i, ret = 0;
292
293 for (i = 0; i < list->nr; i++) {
294 strbuf_addf(&buf, "option %s ", name);
295 quote_c_style(list->items[i].string, &buf, NULL, 0);
296 strbuf_addch(&buf, '\n');
297
298 if ((ret = strbuf_set_helper_option(data, &buf)))
299 break;
300 strbuf_reset(&buf);
301 }
302 strbuf_release(&buf);
303 return ret;
304}
305
ef08ef9e
SP
306static int set_helper_option(struct transport *transport,
307 const char *name, const char *value)
308{
309 struct helper_data *data = transport->data;
ef08ef9e
SP
310 struct strbuf buf = STRBUF_INIT;
311 int i, ret, is_bool = 0;
312
bf3c523c
IL
313 get_helper(transport);
314
ef08ef9e
SP
315 if (!data->option)
316 return 1;
317
a45a2600
NTND
318 if (!strcmp(name, "deepen-not"))
319 return string_list_set_helper_option(data, name,
320 (struct string_list *)value);
321
ef08ef9e
SP
322 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
323 if (!strcmp(name, unsupported_options[i]))
324 return 1;
325 }
326
327 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
328 if (!strcmp(name, boolean_options[i])) {
329 is_bool = 1;
330 break;
331 }
332 }
333
334 strbuf_addf(&buf, "option %s ", name);
335 if (is_bool)
336 strbuf_addstr(&buf, value ? "true" : "false");
337 else
338 quote_c_style(value, &buf, NULL, 0);
339 strbuf_addch(&buf, '\n');
340
9318c5dd 341 ret = strbuf_set_helper_option(data, &buf);
ef08ef9e
SP
342 strbuf_release(&buf);
343 return ret;
344}
345
346static void standard_options(struct transport *t)
347{
348 char buf[16];
ef08ef9e 349 int v = t->verbose;
ef08ef9e 350
d01b3c02 351 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e 352
8c5acfb9 353 xsnprintf(buf, sizeof(buf), "%d", v + 1);
ef08ef9e 354 set_helper_option(t, "verbosity", buf);
c915f11e
EW
355
356 switch (t->family) {
357 case TRANSPORT_FAMILY_ALL:
358 /*
359 * this is already the default,
360 * do not break old remote helpers by setting "all" here
361 */
362 break;
363 case TRANSPORT_FAMILY_IPV4:
364 set_helper_option(t, "family", "ipv4");
365 break;
366 case TRANSPORT_FAMILY_IPV6:
367 set_helper_option(t, "family", "ipv6");
368 break;
369 }
ef08ef9e
SP
370}
371
f2a37151
DB
372static int release_helper(struct transport *transport)
373{
cc567322 374 int res = 0;
72ff8943
DB
375 struct helper_data *data = transport->data;
376 free_refspec(data->refspec_nr, data->refspecs);
377 data->refspecs = NULL;
cc567322 378 res = disconnect_helper(transport);
f2a37151 379 free(transport->data);
cc567322 380 return res;
f2a37151
DB
381}
382
6eb996b5 383static int fetch_with_fetch(struct transport *transport,
37148311 384 int nr_heads, struct ref **to_fetch)
6eb996b5 385{
292ce46b 386 struct helper_data *data = transport->data;
6eb996b5
DB
387 int i;
388 struct strbuf buf = STRBUF_INIT;
389
390 for (i = 0; i < nr_heads; i++) {
1088261f 391 const struct ref *posn = to_fetch[i];
6eb996b5
DB
392 if (posn->status & REF_STATUS_UPTODATE)
393 continue;
2d14d65c
DB
394
395 strbuf_addf(&buf, "fetch %s %s\n",
f4e54d02 396 oid_to_hex(&posn->old_oid),
33cae542 397 posn->symref ? posn->symref : posn->name);
292ce46b 398 }
2d14d65c 399
292ce46b 400 strbuf_addch(&buf, '\n');
bf3c523c 401 sendline(data, &buf);
292ce46b
SP
402
403 while (1) {
5931b33e
FC
404 if (recvline(data, &buf))
405 exit(128);
292ce46b 406
59556548 407 if (starts_with(buf.buf, "lock ")) {
292ce46b
SP
408 const char *name = buf.buf + 5;
409 if (transport->pack_lockfile)
410 warning("%s also locked %s", data->name, name);
411 else
412 transport->pack_lockfile = xstrdup(name);
413 }
9ba38048
NTND
414 else if (data->check_connectivity &&
415 data->transport_options.check_self_contained_and_connected &&
416 !strcmp(buf.buf, "connectivity-ok"))
417 data->transport_options.self_contained_and_connected = 1;
292ce46b
SP
418 else if (!buf.len)
419 break;
420 else
421 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 422 }
292ce46b 423 strbuf_release(&buf);
6eb996b5
DB
424 return 0;
425}
426
e65e91ed
DB
427static int get_importer(struct transport *transport, struct child_process *fastimport)
428{
429 struct child_process *helper = get_helper(transport);
bfc366d9 430 struct helper_data *data = transport->data;
bfc366d9 431 int cat_blob_fd, code;
483bbd4e 432 child_process_init(fastimport);
e65e91ed 433 fastimport->in = helper->out;
173fd1a1
JK
434 argv_array_push(&fastimport->args, "fast-import");
435 argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
e65e91ed 436
bfc366d9
FA
437 if (data->bidi_import) {
438 cat_blob_fd = xdup(helper->in);
173fd1a1 439 argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
bfc366d9 440 }
e65e91ed 441 fastimport->git_cmd = 1;
bfc366d9
FA
442
443 code = start_command(fastimport);
444 return code;
e65e91ed
DB
445}
446
73b49a75
SR
447static int get_exporter(struct transport *transport,
448 struct child_process *fastexport,
73b49a75
SR
449 struct string_list *revlist_args)
450{
a515ebe9 451 struct helper_data *data = transport->data;
73b49a75 452 struct child_process *helper = get_helper(transport);
2aeae40a 453 int i;
852e54bc 454
8828f298 455 child_process_init(fastexport);
73b49a75
SR
456
457 /* we need to duplicate helper->in because we want to use it after
458 * fastexport is done with it. */
459 fastexport->out = dup(helper->in);
2aeae40a
JK
460 argv_array_push(&fastexport->args, "fast-export");
461 argv_array_push(&fastexport->args, "--use-done-feature");
462 argv_array_push(&fastexport->args, data->signed_tags ?
463 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
464 if (data->export_marks)
465 argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
466 if (data->import_marks)
467 argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
73b49a75
SR
468
469 for (i = 0; i < revlist_args->nr; i++)
2aeae40a 470 argv_array_push(&fastexport->args, revlist_args->items[i].string);
73b49a75
SR
471
472 fastexport->git_cmd = 1;
473 return start_command(fastexport);
474}
475
e65e91ed
DB
476static int fetch_with_import(struct transport *transport,
477 int nr_heads, struct ref **to_fetch)
478{
479 struct child_process fastimport;
72ff8943 480 struct helper_data *data = transport->data;
e65e91ed
DB
481 int i;
482 struct ref *posn;
483 struct strbuf buf = STRBUF_INIT;
484
bf3c523c
IL
485 get_helper(transport);
486
e65e91ed
DB
487 if (get_importer(transport, &fastimport))
488 die("Couldn't run fast-import");
489
490 for (i = 0; i < nr_heads; i++) {
491 posn = to_fetch[i];
492 if (posn->status & REF_STATUS_UPTODATE)
493 continue;
494
33cae542
MH
495 strbuf_addf(&buf, "import %s\n",
496 posn->symref ? posn->symref : posn->name);
bf3c523c 497 sendline(data, &buf);
e65e91ed
DB
498 strbuf_reset(&buf);
499 }
9504bc9d
SR
500
501 write_constant(data->helper->in, "\n");
bfc366d9
FA
502 /*
503 * remote-helpers that advertise the bidi-import capability are required to
504 * buffer the complete batch of import commands until this newline before
505 * sending data to fast-import.
506 * These helpers read back data from fast-import on their stdin, which could
507 * be mixed with import commands, otherwise.
508 */
9504bc9d 509
cc567322
SR
510 if (finish_command(&fastimport))
511 die("Error while running fast-import");
e65e91ed 512
dff9d65d
FA
513 /*
514 * The fast-import stream of a remote helper that advertises
515 * the "refspec" capability writes to the refs named after the
516 * right hand side of the first refspec matching each ref we
517 * were fetching.
518 *
519 * (If no "refspec" capability was specified, for historical
7a43c554 520 * reasons we default to the equivalent of *:*.)
dff9d65d
FA
521 *
522 * Store the result in to_fetch[i].old_sha1. Callers such
523 * as "git fetch" can use the value to write feedback to the
524 * terminal, populate FETCH_HEAD, and determine what new value
525 * should be written to peer_ref if the update is a
526 * fast-forward or this is a forced update.
527 */
e65e91ed 528 for (i = 0; i < nr_heads; i++) {
33cae542 529 char *private, *name;
e65e91ed
DB
530 posn = to_fetch[i];
531 if (posn->status & REF_STATUS_UPTODATE)
532 continue;
33cae542 533 name = posn->symref ? posn->symref : posn->name;
72ff8943 534 if (data->refspecs)
33cae542 535 private = apply_refspecs(data->refspecs, data->refspec_nr, name);
72ff8943 536 else
33cae542 537 private = xstrdup(name);
d51b720f 538 if (private) {
34c290a6 539 if (read_ref(private, &posn->old_oid) < 0)
ae25fd39 540 die("Could not read ref %s", private);
d51b720f
MH
541 free(private);
542 }
e65e91ed 543 }
b962dbdc 544 strbuf_release(&buf);
e65e91ed
DB
545 return 0;
546}
547
176e85c1 548static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
fa8c097c
IL
549{
550 struct helper_data *data = transport->data;
176e85c1
BW
551 int ret = 0;
552 int duped;
fa8c097c 553 FILE *input;
176e85c1 554 struct child_process *helper;
fa8c097c
IL
555
556 helper = get_helper(transport);
557
558 /*
559 * Yes, dup the pipe another time, as we need unbuffered version
560 * of input pipe as FILE*. fclose() closes the underlying fd and
561 * stream buffering only can be changed before first I/O operation
562 * on it.
563 */
564 duped = dup(helper->out);
565 if (duped < 0)
566 die_errno("Can't dup helper output fd");
567 input = xfdopen(duped, "r");
568 setvbuf(input, NULL, _IONBF, 0);
569
176e85c1
BW
570 sendline(data, cmdbuf);
571 if (recvline_fh(input, cmdbuf))
572 exit(128);
573
574 if (!strcmp(cmdbuf->buf, "")) {
575 data->no_disconnect_req = 1;
576 if (debug)
577 fprintf(stderr, "Debug: Smart transport connection "
578 "ready.\n");
579 ret = 1;
580 } else if (!strcmp(cmdbuf->buf, "fallback")) {
581 if (debug)
582 fprintf(stderr, "Debug: Falling back to dumb "
583 "transport.\n");
584 } else {
585 die("Unknown response to connect: %s",
586 cmdbuf->buf);
587 }
588
589 fclose(input);
590 return ret;
591}
592
593static int process_connect_service(struct transport *transport,
594 const char *name, const char *exec)
595{
596 struct helper_data *data = transport->data;
597 struct strbuf cmdbuf = STRBUF_INIT;
598 int ret = 0;
599
fa8c097c
IL
600 /*
601 * Handle --upload-pack and friends. This is fire and forget...
602 * just warn if it fails.
603 */
604 if (strcmp(name, exec)) {
176e85c1 605 int r = set_helper_option(transport, "servpath", exec);
fa8c097c
IL
606 if (r > 0)
607 warning("Setting remote service path not supported by protocol.");
608 else if (r < 0)
609 warning("Invalid remote service path.");
610 }
611
176e85c1 612 if (data->connect) {
fa8c097c 613 strbuf_addf(&cmdbuf, "connect %s\n", name);
176e85c1
BW
614 ret = run_connect(transport, &cmdbuf);
615 }
fa8c097c 616
4168be8e 617 strbuf_release(&cmdbuf);
fa8c097c
IL
618 return ret;
619}
620
621static int process_connect(struct transport *transport,
622 int for_push)
623{
624 struct helper_data *data = transport->data;
625 const char *name;
626 const char *exec;
627
628 name = for_push ? "git-receive-pack" : "git-upload-pack";
629 if (for_push)
630 exec = data->transport_options.receivepack;
631 else
632 exec = data->transport_options.uploadpack;
633
634 return process_connect_service(transport, name, exec);
635}
636
b236752a
IL
637static int connect_helper(struct transport *transport, const char *name,
638 const char *exec, int fd[2])
639{
640 struct helper_data *data = transport->data;
641
642 /* Get_helper so connect is inited. */
643 get_helper(transport);
644 if (!data->connect)
645 die("Operation not supported by protocol.");
646
647 if (!process_connect_service(transport, name, exec))
648 die("Can't connect to subservice %s.", name);
649
650 fd[0] = data->helper->out;
651 fd[1] = data->helper->in;
652 return 0;
653}
654
6eb996b5 655static int fetch(struct transport *transport,
37148311 656 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
657{
658 struct helper_data *data = transport->data;
659 int i, count;
660
fa8c097c
IL
661 if (process_connect(transport, 0)) {
662 do_take_over(transport);
e967ca38 663 return transport->vtable->fetch(transport, nr_heads, to_fetch);
fa8c097c
IL
664 }
665
6eb996b5
DB
666 count = 0;
667 for (i = 0; i < nr_heads; i++)
668 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
669 count++;
670
671 if (!count)
672 return 0;
673
aab1beb0
MH
674 if (data->check_connectivity &&
675 data->transport_options.check_self_contained_and_connected)
676 set_helper_option(transport, "check-connectivity", "true");
677
678 if (transport->cloning)
679 set_helper_option(transport, "cloning", "true");
680
681 if (data->transport_options.update_shallow)
682 set_helper_option(transport, "update-shallow", "true");
683
6eb996b5
DB
684 if (data->fetch)
685 return fetch_with_fetch(transport, nr_heads, to_fetch);
686
e65e91ed
DB
687 if (data->import)
688 return fetch_with_import(transport, nr_heads, to_fetch);
689
6eb996b5
DB
690 return -1;
691}
692
664059fb 693static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
694 struct ref **ref,
695 struct ref *remote_refs)
696{
697 char *refname, *msg;
f9e3c6be 698 int status, forced = 0;
d2e73c6f 699
59556548 700 if (starts_with(buf->buf, "ok ")) {
d2e73c6f
SR
701 status = REF_STATUS_OK;
702 refname = buf->buf + 3;
59556548 703 } else if (starts_with(buf->buf, "error ")) {
d2e73c6f
SR
704 status = REF_STATUS_REMOTE_REJECT;
705 refname = buf->buf + 6;
706 } else
82247e9b 707 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
708
709 msg = strchr(refname, ' ');
710 if (msg) {
711 struct strbuf msg_buf = STRBUF_INIT;
712 const char *end;
713
714 *msg++ = '\0';
715 if (!unquote_c_style(&msg_buf, msg, &end))
716 msg = strbuf_detach(&msg_buf, NULL);
717 else
718 msg = xstrdup(msg);
719 strbuf_release(&msg_buf);
720
721 if (!strcmp(msg, "no match")) {
722 status = REF_STATUS_NONE;
6a83d902 723 FREE_AND_NULL(msg);
d2e73c6f
SR
724 }
725 else if (!strcmp(msg, "up to date")) {
726 status = REF_STATUS_UPTODATE;
6a83d902 727 FREE_AND_NULL(msg);
d2e73c6f
SR
728 }
729 else if (!strcmp(msg, "non-fast forward")) {
730 status = REF_STATUS_REJECT_NONFASTFORWARD;
6a83d902 731 FREE_AND_NULL(msg);
d2e73c6f 732 }
dbfeddb1
CR
733 else if (!strcmp(msg, "already exists")) {
734 status = REF_STATUS_REJECT_ALREADY_EXISTS;
6a83d902 735 FREE_AND_NULL(msg);
dbfeddb1 736 }
75e5c0dc
JH
737 else if (!strcmp(msg, "fetch first")) {
738 status = REF_STATUS_REJECT_FETCH_FIRST;
6a83d902 739 FREE_AND_NULL(msg);
75e5c0dc
JH
740 }
741 else if (!strcmp(msg, "needs force")) {
742 status = REF_STATUS_REJECT_NEEDS_FORCE;
6a83d902 743 FREE_AND_NULL(msg);
75e5c0dc 744 }
631b5ef2
JH
745 else if (!strcmp(msg, "stale info")) {
746 status = REF_STATUS_REJECT_STALE;
6a83d902 747 FREE_AND_NULL(msg);
631b5ef2 748 }
f9e3c6be
FC
749 else if (!strcmp(msg, "forced update")) {
750 forced = 1;
6a83d902 751 FREE_AND_NULL(msg);
f9e3c6be 752 }
d2e73c6f
SR
753 }
754
755 if (*ref)
756 *ref = find_ref_by_name(*ref, refname);
757 if (!*ref)
758 *ref = find_ref_by_name(remote_refs, refname);
759 if (!*ref) {
760 warning("helper reported unexpected status of %s", refname);
664059fb 761 return 1;
d2e73c6f
SR
762 }
763
764 if ((*ref)->status != REF_STATUS_NONE) {
765 /*
766 * Earlier, the ref was marked not to be pushed, so ignore the ref
767 * status reported by the remote helper if the latter is 'no match'.
768 */
769 if (status == REF_STATUS_NONE)
664059fb 770 return 1;
d2e73c6f
SR
771 }
772
773 (*ref)->status = status;
cf31f70c 774 (*ref)->forced_update |= forced;
d2e73c6f 775 (*ref)->remote_status = msg;
126aac5c 776 return !(status == REF_STATUS_OK);
d2e73c6f
SR
777}
778
0551a06c 779static int push_update_refs_status(struct helper_data *data,
5a75353f
FC
780 struct ref *remote_refs,
781 int flags)
d2e73c6f
SR
782{
783 struct strbuf buf = STRBUF_INIT;
784 struct ref *ref = remote_refs;
0551a06c
FC
785 int ret = 0;
786
d2e73c6f 787 for (;;) {
664059fb
FC
788 char *private;
789
0551a06c
FC
790 if (recvline(data, &buf)) {
791 ret = 1;
792 break;
793 }
794
d2e73c6f
SR
795 if (!buf.len)
796 break;
797
664059fb
FC
798 if (push_update_ref_status(&buf, &ref, remote_refs))
799 continue;
800
5a75353f 801 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
664059fb
FC
802 continue;
803
804 /* propagate back the update to the remote namespace */
805 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
806 if (!private)
807 continue;
ae077771 808 update_ref("update by helper", private, &ref->new_oid, NULL,
809 0, 0);
664059fb 810 free(private);
d2e73c6f
SR
811 }
812 strbuf_release(&buf);
0551a06c 813 return ret;
d2e73c6f
SR
814}
815
30261094
DB
816static void set_common_push_options(struct transport *transport,
817 const char *name, int flags)
818{
819 if (flags & TRANSPORT_PUSH_DRY_RUN) {
820 if (set_helper_option(transport, "dry-run", "true") != 0)
821 die("helper %s does not support dry-run", name);
822 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
823 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
824 die("helper %s does not support --signed", name);
825 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
826 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
827 die("helper %s does not support --signed=if-asked", name);
828 }
438fc684
SB
829
830 if (flags & TRANSPORT_PUSH_OPTIONS) {
831 struct string_list_item *item;
832 for_each_string_list_item(item, transport->push_options)
833 if (set_helper_option(transport, "push-option", item->string) != 0)
834 die("helper %s does not support 'push-option'", name);
835 }
30261094
DB
836}
837
73b49a75 838static int push_refs_with_push(struct transport *transport,
05c1eb10 839 struct ref *remote_refs, int flags)
ae4efe19
SP
840{
841 int force_all = flags & TRANSPORT_PUSH_FORCE;
842 int mirror = flags & TRANSPORT_PUSH_MIRROR;
843 struct helper_data *data = transport->data;
844 struct strbuf buf = STRBUF_INIT;
ae4efe19 845 struct ref *ref;
05c1eb10
JH
846 struct string_list cas_options = STRING_LIST_INIT_DUP;
847 struct string_list_item *cas_option;
ae4efe19 848
c0aa335c 849 get_helper(transport);
ae4efe19
SP
850 if (!data->push)
851 return 1;
852
853 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 854 if (!ref->peer_ref && !mirror)
ae4efe19
SP
855 continue;
856
20e8b465
TRC
857 /* Check for statuses set by set_ref_status_for_push() */
858 switch (ref->status) {
859 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 860 case REF_STATUS_REJECT_STALE:
dbfeddb1 861 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 862 case REF_STATUS_UPTODATE:
ae4efe19 863 continue;
20e8b465
TRC
864 default:
865 ; /* do nothing */
ae4efe19
SP
866 }
867
868 if (force_all)
869 ref->force = 1;
870
871 strbuf_addstr(&buf, "push ");
872 if (!ref->deletion) {
873 if (ref->force)
874 strbuf_addch(&buf, '+');
875 if (ref->peer_ref)
876 strbuf_addstr(&buf, ref->peer_ref->name);
877 else
f4e54d02 878 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
ae4efe19
SP
879 }
880 strbuf_addch(&buf, ':');
881 strbuf_addstr(&buf, ref->name);
882 strbuf_addch(&buf, '\n');
05c1eb10
JH
883
884 /*
885 * The "--force-with-lease" options without explicit
886 * values to expect have already been expanded into
f4e54d02 887 * the ref->old_oid_expect[] field; we can ignore
05c1eb10
JH
888 * transport->smart_options->cas altogether and instead
889 * can enumerate them from the refs.
890 */
891 if (ref->expect_old_sha1) {
892 struct strbuf cas = STRBUF_INIT;
893 strbuf_addf(&cas, "%s:%s",
f4e54d02 894 ref->name, oid_to_hex(&ref->old_oid_expect));
176cb979
RS
895 string_list_append_nodup(&cas_options,
896 strbuf_detach(&cas, NULL));
05c1eb10 897 }
ae4efe19 898 }
05c1eb10
JH
899 if (buf.len == 0) {
900 string_list_clear(&cas_options, 0);
d8f67d20 901 return 0;
05c1eb10 902 }
ae4efe19 903
05c1eb10
JH
904 for_each_string_list_item(cas_option, &cas_options)
905 set_helper_option(transport, "cas", cas_option->string);
30261094 906 set_common_push_options(transport, data->name, flags);
ae4efe19
SP
907
908 strbuf_addch(&buf, '\n');
bf3c523c 909 sendline(data, &buf);
ae4efe19 910 strbuf_release(&buf);
176cb979 911 string_list_clear(&cas_options, 0);
d2e73c6f 912
0551a06c 913 return push_update_refs_status(data, remote_refs, flags);
ae4efe19
SP
914}
915
73b49a75
SR
916static int push_refs_with_export(struct transport *transport,
917 struct ref *remote_refs, int flags)
918{
919 struct ref *ref;
920 struct child_process *helper, exporter;
921 struct helper_data *data = transport->data;
d98c8153 922 struct string_list revlist_args = STRING_LIST_INIT_DUP;
73b49a75
SR
923 struct strbuf buf = STRBUF_INIT;
924
21610d82
FC
925 if (!data->refspecs)
926 die("remote-helper doesn't support push; refspec needed");
927
30261094 928 set_common_push_options(transport, data->name, flags);
510fa6f5
FC
929 if (flags & TRANSPORT_PUSH_FORCE) {
930 if (set_helper_option(transport, "force", "true") != 0)
931 warning("helper %s does not support 'force'", data->name);
932 }
933
73b49a75
SR
934 helper = get_helper(transport);
935
936 write_constant(helper->in, "export\n");
937
73b49a75
SR
938 for (ref = remote_refs; ref; ref = ref->next) {
939 char *private;
27912a03 940 struct object_id oid;
73b49a75 941
73b49a75 942 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
e82caf38 943 if (private && !get_oid(private, &oid)) {
73b49a75 944 strbuf_addf(&buf, "^%s", private);
176cb979
RS
945 string_list_append_nodup(&revlist_args,
946 strbuf_detach(&buf, NULL));
27912a03 947 oidcpy(&ref->old_oid, &oid);
73b49a75 948 }
2faa1527 949 free(private);
73b49a75 950
67c9c782 951 if (ref->peer_ref) {
d98c8153 952 if (strcmp(ref->name, ref->peer_ref->name)) {
f3d03763
FC
953 if (!ref->deletion) {
954 const char *name;
955 int flag;
956
957 /* Follow symbolic refs (mainly for HEAD). */
49e61479 958 name = resolve_ref_unsafe(ref->peer_ref->name,
959 RESOLVE_REF_READING,
960 &oid, &flag);
f3d03763
FC
961 if (!name || !(flag & REF_ISSYMREF))
962 name = ref->peer_ref->name;
9193f742 963
f3d03763
FC
964 strbuf_addf(&buf, "%s:%s", name, ref->name);
965 } else
966 strbuf_addf(&buf, ":%s", ref->name);
9193f742 967
d98c8153
FC
968 string_list_append(&revlist_args, "--refspec");
969 string_list_append(&revlist_args, buf.buf);
970 strbuf_release(&buf);
971 }
f3d03763
FC
972 if (!ref->deletion)
973 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 974 }
73b49a75
SR
975 }
976
a515ebe9 977 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
978 die("Couldn't run fast-export");
979
d98c8153
FC
980 string_list_clear(&revlist_args, 1);
981
cc567322
SR
982 if (finish_command(&exporter))
983 die("Error while running fast-export");
3994e64d
FC
984 if (push_update_refs_status(data, remote_refs, flags))
985 return 1;
986
987 if (data->export_marks) {
988 strbuf_addf(&buf, "%s.tmp", data->export_marks);
989 rename(buf.buf, data->export_marks);
990 strbuf_release(&buf);
991 }
992
993 return 0;
73b49a75
SR
994}
995
996static int push_refs(struct transport *transport,
997 struct ref *remote_refs, int flags)
998{
999 struct helper_data *data = transport->data;
1000
1001 if (process_connect(transport, 1)) {
1002 do_take_over(transport);
e967ca38 1003 return transport->vtable->push_refs(transport, remote_refs, flags);
73b49a75
SR
1004 }
1005
1006 if (!remote_refs) {
1007 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
1008 "Perhaps you should specify a branch such as 'master'.\n");
1009 return 0;
1010 }
1011
1012 if (data->push)
1013 return push_refs_with_push(transport, remote_refs, flags);
1014
1015 if (data->export)
1016 return push_refs_with_export(transport, remote_refs, flags);
1017
1018 return -1;
1019}
1020
1021
f8ec9167
DB
1022static int has_attribute(const char *attrs, const char *attr) {
1023 int len;
1024 if (!attrs)
1025 return 0;
1026
1027 len = strlen(attr);
1028 for (;;) {
1029 const char *space = strchrnul(attrs, ' ');
1030 if (len == space - attrs && !strncmp(attrs, attr, len))
1031 return 1;
1032 if (!*space)
1033 return 0;
1034 attrs = space + 1;
1035 }
1036}
1037
834cf34b
BW
1038static struct ref *get_refs_list(struct transport *transport, int for_push,
1039 const struct argv_array *ref_prefixes)
6eb996b5 1040{
292ce46b 1041 struct helper_data *data = transport->data;
6eb996b5
DB
1042 struct child_process *helper;
1043 struct ref *ret = NULL;
1044 struct ref **tail = &ret;
1045 struct ref *posn;
1046 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
1047
1048 helper = get_helper(transport);
2d14d65c 1049
fa8c097c
IL
1050 if (process_connect(transport, for_push)) {
1051 do_take_over(transport);
834cf34b 1052 return transport->vtable->get_refs_list(transport, for_push, ref_prefixes);
fa8c097c
IL
1053 }
1054
ae4efe19
SP
1055 if (data->push && for_push)
1056 write_str_in_full(helper->in, "list for-push\n");
1057 else
1058 write_str_in_full(helper->in, "list\n");
6eb996b5 1059
6eb996b5
DB
1060 while (1) {
1061 char *eov, *eon;
5931b33e
FC
1062 if (recvline(data, &buf))
1063 exit(128);
6eb996b5
DB
1064
1065 if (!*buf.buf)
1066 break;
1067
1068 eov = strchr(buf.buf, ' ');
1069 if (!eov)
1070 die("Malformed response in ref list: %s", buf.buf);
1071 eon = strchr(eov + 1, ' ');
1072 *eov = '\0';
1073 if (eon)
1074 *eon = '\0';
1075 *tail = alloc_ref(eov + 1);
1076 if (buf.buf[0] == '@')
1077 (*tail)->symref = xstrdup(buf.buf + 1);
1078 else if (buf.buf[0] != '?')
f4e54d02 1079 get_oid_hex(buf.buf, &(*tail)->old_oid);
f8ec9167
DB
1080 if (eon) {
1081 if (has_attribute(eon + 1, "unchanged")) {
1082 (*tail)->status |= REF_STATUS_UPTODATE;
34c290a6 1083 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
3c5077fe 1084 die(_("Could not read ref %s"),
ae25fd39 1085 (*tail)->name);
f8ec9167
DB
1086 }
1087 }
6eb996b5
DB
1088 tail = &((*tail)->next);
1089 }
bf3c523c
IL
1090 if (debug)
1091 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
1092 strbuf_release(&buf);
1093
1094 for (posn = ret; posn; posn = posn->next)
1095 resolve_remote_symref(posn, ret);
1096
1097 return ret;
1098}
1099
e967ca38
JT
1100static struct transport_vtable vtable = {
1101 set_helper_option,
1102 get_refs_list,
1103 fetch,
1104 push_refs,
1105 connect_helper,
1106 release_helper
1107};
1108
c9e388bb 1109int transport_helper_init(struct transport *transport, const char *name)
6eb996b5 1110{
92e25b6b 1111 struct helper_data *data = xcalloc(1, sizeof(*data));
c9e388bb 1112 data->name = name;
6eb996b5 1113
a5adaced
JK
1114 transport_check_allowed(name);
1115
bf3c523c
IL
1116 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1117 debug = 1;
1118
6eb996b5 1119 transport->data = data;
e967ca38 1120 transport->vtable = &vtable;
61b075bd 1121 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1122 return 0;
1123}
419f37db
IL
1124
1125/*
1126 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1127 * buffer less), so attempt reads and writes with up to that size.
1128 */
1129#define BUFFERSIZE 65536
1130/* This should be enough to hold debugging message. */
1131#define PBUFFERSIZE 8192
1132
1133/* Print bidirectional transfer loop debug message. */
4621085b 1134__attribute__((format (printf, 1, 2)))
419f37db
IL
1135static void transfer_debug(const char *fmt, ...)
1136{
6cdf8a79
1137 /*
1138 * NEEDSWORK: This function is sometimes used from multiple threads, and
1139 * we end up using debug_enabled racily. That "should not matter" since
1140 * we always write the same value, but it's still wrong. This function
1141 * is listed in .tsan-suppressions for the time being.
1142 */
1143
419f37db
IL
1144 va_list args;
1145 char msgbuf[PBUFFERSIZE];
1146 static int debug_enabled = -1;
1147
1148 if (debug_enabled < 0)
1149 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1150 if (!debug_enabled)
1151 return;
1152
1153 va_start(args, fmt);
1154 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1155 va_end(args);
1156 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1157}
1158
1159/* Stream state: More data may be coming in this direction. */
2e3a16b2 1160#define SSTATE_TRANSFERRING 0
419f37db
IL
1161/*
1162 * Stream state: No more data coming in this direction, flushing rest of
1163 * data.
1164 */
1165#define SSTATE_FLUSHING 1
1166/* Stream state: Transfer in this direction finished. */
1167#define SSTATE_FINISHED 2
1168
2e3a16b2 1169#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
419f37db
IL
1170#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1171#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1172
1173/* Unidirectional transfer. */
1174struct unidirectional_transfer {
1175 /* Source */
1176 int src;
1177 /* Destination */
1178 int dest;
1179 /* Is source socket? */
1180 int src_is_sock;
1181 /* Is destination socket? */
1182 int dest_is_sock;
41ccfdd9 1183 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1184 int state;
1185 /* Buffer. */
1186 char buf[BUFFERSIZE];
1187 /* Buffer used. */
1188 size_t bufuse;
1189 /* Name of source. */
1190 const char *src_name;
1191 /* Name of destination. */
1192 const char *dest_name;
1193};
1194
1195/* Closes the target (for writing) if transfer has finished. */
1196static void udt_close_if_finished(struct unidirectional_transfer *t)
1197{
1198 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1199 t->state = SSTATE_FINISHED;
1200 if (t->dest_is_sock)
1201 shutdown(t->dest, SHUT_WR);
1202 else
1203 close(t->dest);
1204 transfer_debug("Closed %s.", t->dest_name);
1205 }
1206}
1207
1208/*
832c0e5e 1209 * Tries to read data from source into buffer. If buffer is full,
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1210 * no data is read. Returns 0 on success, -1 on error.
1211 */
1212static int udt_do_read(struct unidirectional_transfer *t)
1213{
1214 ssize_t bytes;
1215
1216 if (t->bufuse == BUFFERSIZE)
1217 return 0; /* No space for more. */
1218
1219 transfer_debug("%s is readable", t->src_name);
1220 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1221 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1222 errno != EINTR) {
1fee1dce 1223 error_errno("read(%s) failed", t->src_name);
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1224 return -1;
1225 } else if (bytes == 0) {
1226 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1227 t->src_name, (int)t->bufuse);
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1228 t->state = SSTATE_FLUSHING;
1229 } else if (bytes > 0) {
1230 t->bufuse += bytes;
1231 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1232 (int)bytes, t->src_name, (int)t->bufuse);
1233 }
1234 return 0;
1235}
1236
1237/* Tries to write data from buffer into destination. If buffer is empty,
1238 * no data is written. Returns 0 on success, -1 on error.
1239 */
1240static int udt_do_write(struct unidirectional_transfer *t)
1241{
803dbdb9 1242 ssize_t bytes;
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1243
1244 if (t->bufuse == 0)
1245 return 0; /* Nothing to write. */
1246
1247 transfer_debug("%s is writable", t->dest_name);
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1248 bytes = xwrite(t->dest, t->buf, t->bufuse);
1249 if (bytes < 0 && errno != EWOULDBLOCK) {
1fee1dce 1250 error_errno("write(%s) failed", t->dest_name);
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1251 return -1;
1252 } else if (bytes > 0) {
1253 t->bufuse -= bytes;
1254 if (t->bufuse)
1255 memmove(t->buf, t->buf + bytes, t->bufuse);
1256 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1257 (int)bytes, t->dest_name, (int)t->bufuse);
1258 }
1259 return 0;
1260}
1261
1262
1263/* State of bidirectional transfer loop. */
1264struct bidirectional_transfer_state {
1265 /* Direction from program to git. */
1266 struct unidirectional_transfer ptg;
1267 /* Direction from git to program. */
1268 struct unidirectional_transfer gtp;
1269};
1270
1271static void *udt_copy_task_routine(void *udt)
1272{
1273 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1274 while (t->state != SSTATE_FINISHED) {
1275 if (STATE_NEEDS_READING(t->state))
1276 if (udt_do_read(t))
1277 return NULL;
1278 if (STATE_NEEDS_WRITING(t->state))
1279 if (udt_do_write(t))
1280 return NULL;
1281 if (STATE_NEEDS_CLOSING(t->state))
1282 udt_close_if_finished(t);
1283 }
1284 return udt; /* Just some non-NULL value. */
1285}
1286
1287#ifndef NO_PTHREADS
1288
1289/*
98e023de 1290 * Join thread, with appropriate errors on failure. Name is name for the
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1291 * thread (for error messages). Returns 0 on success, 1 on failure.
1292 */
1293static int tloop_join(pthread_t thread, const char *name)
1294{
1295 int err;
1296 void *tret;
1297 err = pthread_join(thread, &tret);
1298 if (!tret) {
1299 error("%s thread failed", name);
1300 return 1;
1301 }
1302 if (err) {
1303 error("%s thread failed to join: %s", name, strerror(err));
1304 return 1;
1305 }
1306 return 0;
1307}
1308
1309/*
1310 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1311 * -1 on failure.
1312 */
1313static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1314{
1315 pthread_t gtp_thread;
1316 pthread_t ptg_thread;
1317 int err;
1318 int ret = 0;
1319 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1320 &s->gtp);
1321 if (err)
1322 die("Can't start thread for copying data: %s", strerror(err));
1323 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1324 &s->ptg);
1325 if (err)
1326 die("Can't start thread for copying data: %s", strerror(err));
1327
1328 ret |= tloop_join(gtp_thread, "Git to program copy");
1329 ret |= tloop_join(ptg_thread, "Program to git copy");
1330 return ret;
1331}
1332#else
1333
1334/* Close the source and target (for writing) for transfer. */
1335static void udt_kill_transfer(struct unidirectional_transfer *t)
1336{
1337 t->state = SSTATE_FINISHED;
1338 /*
1339 * Socket read end left open isn't a disaster if nobody
1340 * attempts to read from it (mingw compat headers do not
1341 * have SHUT_RD)...
1342 *
1343 * We can't fully close the socket since otherwise gtp
1344 * task would first close the socket it sends data to
1345 * while closing the ptg file descriptors.
1346 */
1347 if (!t->src_is_sock)
1348 close(t->src);
1349 if (t->dest_is_sock)
1350 shutdown(t->dest, SHUT_WR);
1351 else
1352 close(t->dest);
1353}
1354
1355/*
98e023de 1356 * Join process, with appropriate errors on failure. Name is name for the
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1357 * process (for error messages). Returns 0 on success, 1 on failure.
1358 */
1359static int tloop_join(pid_t pid, const char *name)
1360{
1361 int tret;
1362 if (waitpid(pid, &tret, 0) < 0) {
1fee1dce 1363 error_errno("%s process failed to wait", name);
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1364 return 1;
1365 }
1366 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1367 error("%s process failed", name);
1368 return 1;
1369 }
1370 return 0;
1371}
1372
1373/*
1374 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1375 * -1 on failure.
1376 */
1377static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1378{
1379 pid_t pid1, pid2;
1380 int ret = 0;
1381
1382 /* Fork thread #1: git to program. */
1383 pid1 = fork();
1384 if (pid1 < 0)
1385 die_errno("Can't start thread for copying data");
1386 else if (pid1 == 0) {
1387 udt_kill_transfer(&s->ptg);
1388 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1389 }
1390
1391 /* Fork thread #2: program to git. */
1392 pid2 = fork();
1393 if (pid2 < 0)
1394 die_errno("Can't start thread for copying data");
1395 else if (pid2 == 0) {
1396 udt_kill_transfer(&s->gtp);
1397 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1398 }
1399
1400 /*
1401 * Close both streams in parent as to not interfere with
1402 * end of file detection and wait for both tasks to finish.
1403 */
1404 udt_kill_transfer(&s->gtp);
1405 udt_kill_transfer(&s->ptg);
1406 ret |= tloop_join(pid1, "Git to program copy");
1407 ret |= tloop_join(pid2, "Program to git copy");
1408 return ret;
1409}
1410#endif
1411
1412/*
1413 * Copies data from stdin to output and from input to stdout simultaneously.
1414 * Additionally filtering through given filter. If filter is NULL, uses
1415 * identity filter.
1416 */
1417int bidirectional_transfer_loop(int input, int output)
1418{
1419 struct bidirectional_transfer_state state;
1420
1421 /* Fill the state fields. */
1422 state.ptg.src = input;
1423 state.ptg.dest = 1;
1424 state.ptg.src_is_sock = (input == output);
1425 state.ptg.dest_is_sock = 0;
2e3a16b2 1426 state.ptg.state = SSTATE_TRANSFERRING;
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1427 state.ptg.bufuse = 0;
1428 state.ptg.src_name = "remote input";
1429 state.ptg.dest_name = "stdout";
1430
1431 state.gtp.src = 0;
1432 state.gtp.dest = output;
1433 state.gtp.src_is_sock = 0;
1434 state.gtp.dest_is_sock = (input == output);
2e3a16b2 1435 state.gtp.state = SSTATE_TRANSFERRING;
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1436 state.gtp.bufuse = 0;
1437 state.gtp.src_name = "stdin";
1438 state.gtp.dest_name = "remote output";
1439
1440 return tloop_spawnwait_tasks(&state);
1441}