refs: convert update_ref and refs_update_ref to use struct object_id
[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);
06f46f23 47 if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0)
bf3c523c
IL
48 die_errno("Full write to remote helper failed");
49}
50
c096955c 51static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
bf3c523c
IL
52{
53 strbuf_reset(buffer);
54 if (debug)
55 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
692dfdfa 56 if (strbuf_getline(buffer, helper) == EOF) {
bf3c523c
IL
57 if (debug)
58 fprintf(stderr, "Debug: Remote helper quit.\n");
5931b33e 59 return 1;
bf3c523c
IL
60 }
61
62 if (debug)
63 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
64 return 0;
65}
66
fa8c097c
IL
67static int recvline(struct helper_data *helper, struct strbuf *buffer)
68{
c096955c 69 return recvline_fh(helper->out, buffer, helper->name);
fa8c097c
IL
70}
71
bf3c523c
IL
72static void write_constant(int fd, const char *str)
73{
74 if (debug)
75 fprintf(stderr, "Debug: Remote helper: -> %s", str);
06f46f23 76 if (write_in_full(fd, str, strlen(str)) < 0)
bf3c523c
IL
77 die_errno("Full write to remote helper failed");
78}
79
c2e86add 80static const char *remove_ext_force(const char *url)
25d5cc48
IL
81{
82 if (url) {
83 const char *colon = strchr(url, ':');
84 if (colon && colon[1] == ':')
85 return colon + 2;
86 }
87 return url;
88}
89
fa8c097c
IL
90static void do_take_over(struct transport *transport)
91{
92 struct helper_data *data;
93 data = (struct helper_data *)transport->data;
94 transport_take_over(transport, data->helper);
95 fclose(data->out);
96 free(data);
97}
98
2879bc3b
MH
99static void standard_options(struct transport *t);
100
6eb996b5
DB
101static struct child_process *get_helper(struct transport *transport)
102{
103 struct helper_data *data = transport->data;
104 struct strbuf buf = STRBUF_INIT;
105 struct child_process *helper;
72ff8943
DB
106 const char **refspecs = NULL;
107 int refspec_nr = 0;
108 int refspec_alloc = 0;
61b075bd 109 int duped;
6b02de3b 110 int code;
6eb996b5
DB
111
112 if (data->helper)
113 return data->helper;
114
483bbd4e
RS
115 helper = xmalloc(sizeof(*helper));
116 child_process_init(helper);
6eb996b5
DB
117 helper->in = -1;
118 helper->out = -1;
119 helper->err = 0;
e0ab2ac6
JK
120 argv_array_pushf(&helper->args, "git-remote-%s", data->name);
121 argv_array_push(&helper->args, transport->remote->name);
122 argv_array_push(&helper->args, remove_ext_force(transport->url));
6b02de3b
IL
123 helper->git_cmd = 0;
124 helper->silent_exec_failure = 1;
e1735872 125
4b0c3c77
JN
126 if (have_git_dir())
127 argv_array_pushf(&helper->env_array, "%s=%s",
128 GIT_DIR_ENVIRONMENT, get_git_dir());
e1735872 129
6b02de3b
IL
130 code = start_command(helper);
131 if (code < 0 && errno == ENOENT)
132 die("Unable to find remote helper for '%s'", data->name);
133 else if (code != 0)
134 exit(code);
135
6eb996b5 136 data->helper = helper;
fa8c097c 137 data->no_disconnect_req = 0;
6eb996b5 138
61b075bd 139 /*
1a0c8dfd
JH
140 * Open the output as FILE* so strbuf_getline_*() family of
141 * functions can be used.
61b075bd
IL
142 * Do this with duped fd because fclose() will close the fd,
143 * and stuff like taking over will require the fd to remain.
61b075bd
IL
144 */
145 duped = dup(helper->out);
146 if (duped < 0)
147 die_errno("Can't dup helper output fd");
148 data->out = xfdopen(duped, "r");
149
bf3c523c 150 write_constant(helper->in, "capabilities\n");
2d14d65c 151
6eb996b5 152 while (1) {
21a2d4ad 153 const char *capname, *arg;
28ed5b35 154 int mandatory = 0;
5931b33e
FC
155 if (recvline(data, &buf))
156 exit(128);
6eb996b5
DB
157
158 if (!*buf.buf)
159 break;
28ed5b35
IL
160
161 if (*buf.buf == '*') {
162 capname = buf.buf + 1;
163 mandatory = 1;
164 } else
165 capname = buf.buf;
166
bf3c523c 167 if (debug)
28ed5b35
IL
168 fprintf(stderr, "Debug: Got cap %s\n", capname);
169 if (!strcmp(capname, "fetch"))
6eb996b5 170 data->fetch = 1;
28ed5b35 171 else if (!strcmp(capname, "option"))
ef08ef9e 172 data->option = 1;
28ed5b35 173 else if (!strcmp(capname, "push"))
ae4efe19 174 data->push = 1;
28ed5b35 175 else if (!strcmp(capname, "import"))
e65e91ed 176 data->import = 1;
bfc366d9
FA
177 else if (!strcmp(capname, "bidi-import"))
178 data->bidi_import = 1;
73b49a75
SR
179 else if (!strcmp(capname, "export"))
180 data->export = 1;
9ba38048
NTND
181 else if (!strcmp(capname, "check-connectivity"))
182 data->check_connectivity = 1;
21a2d4ad 183 else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) {
72ff8943
DB
184 ALLOC_GROW(refspecs,
185 refspec_nr + 1,
186 refspec_alloc);
21a2d4ad 187 refspecs[refspec_nr++] = xstrdup(arg);
fa8c097c
IL
188 } else if (!strcmp(capname, "connect")) {
189 data->connect = 1;
0d957a4d
JK
190 } else if (!strcmp(capname, "signed-tags")) {
191 data->signed_tags = 1;
21a2d4ad
JK
192 } else if (skip_prefix(capname, "export-marks ", &arg)) {
193 data->export_marks = xstrdup(arg);
194 } else if (skip_prefix(capname, "import-marks ", &arg)) {
195 data->import_marks = xstrdup(arg);
59556548 196 } else if (starts_with(capname, "no-private-update")) {
597b831a 197 data->no_private_update = 1;
28ed5b35 198 } else if (mandatory) {
9517e6b8 199 die("Unknown mandatory capability %s. This remote "
82247e9b 200 "helper probably needs newer version of Git.",
28ed5b35 201 capname);
72ff8943
DB
202 }
203 }
204 if (refspecs) {
205 int i;
206 data->refspec_nr = refspec_nr;
207 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
b120ef3e 208 for (i = 0; i < refspec_nr; i++)
72ff8943 209 free((char *)refspecs[i]);
72ff8943 210 free(refspecs);
a93b4a09
FC
211 } else if (data->import || data->bidi_import || data->export) {
212 warning("This remote helper should implement refspec capability.");
6eb996b5 213 }
b962dbdc 214 strbuf_release(&buf);
bf3c523c
IL
215 if (debug)
216 fprintf(stderr, "Debug: Capabilities complete.\n");
2879bc3b 217 standard_options(transport);
6eb996b5
DB
218 return data->helper;
219}
220
221static int disconnect_helper(struct transport *transport)
222{
223 struct helper_data *data = transport->data;
cc567322 224 int res = 0;
bf3c523c 225
6eb996b5 226 if (data->helper) {
bf3c523c
IL
227 if (debug)
228 fprintf(stderr, "Debug: Disconnecting.\n");
fa8c097c 229 if (!data->no_disconnect_req) {
c34fe630
JK
230 /*
231 * Ignore write errors; there's nothing we can do,
232 * since we're about to close the pipe anyway. And the
233 * most likely error is EPIPE due to the helper dying
234 * to report an error itself.
235 */
236 sigchain_push(SIGPIPE, SIG_IGN);
237 xwrite(data->helper->in, "\n", 1);
238 sigchain_pop(SIGPIPE);
fa8c097c 239 }
6eb996b5 240 close(data->helper->in);
61b075bd 241 close(data->helper->out);
292ce46b 242 fclose(data->out);
cc567322 243 res = finish_command(data->helper);
6a83d902 244 FREE_AND_NULL(data->helper);
6eb996b5 245 }
cc567322 246 return res;
6eb996b5
DB
247}
248
ef08ef9e
SP
249static const char *unsupported_options[] = {
250 TRANS_OPT_UPLOADPACK,
251 TRANS_OPT_RECEIVEPACK,
252 TRANS_OPT_THIN,
253 TRANS_OPT_KEEP
254 };
23cd01ec 255
ef08ef9e
SP
256static const char *boolean_options[] = {
257 TRANS_OPT_THIN,
258 TRANS_OPT_KEEP,
0ea47f9d 259 TRANS_OPT_FOLLOWTAGS,
cccf74e2 260 TRANS_OPT_DEEPEN_RELATIVE
ef08ef9e
SP
261 };
262
9318c5dd
NTND
263static int strbuf_set_helper_option(struct helper_data *data,
264 struct strbuf *buf)
265{
266 int ret;
267
268 sendline(data, buf);
269 if (recvline(data, buf))
270 exit(128);
271
272 if (!strcmp(buf->buf, "ok"))
273 ret = 0;
274 else if (starts_with(buf->buf, "error"))
275 ret = -1;
276 else if (!strcmp(buf->buf, "unsupported"))
277 ret = 1;
278 else {
279 warning("%s unexpectedly said: '%s'", data->name, buf->buf);
280 ret = 1;
281 }
282 return ret;
283}
284
a45a2600
NTND
285static int string_list_set_helper_option(struct helper_data *data,
286 const char *name,
287 struct string_list *list)
288{
289 struct strbuf buf = STRBUF_INIT;
290 int i, ret = 0;
291
292 for (i = 0; i < list->nr; i++) {
293 strbuf_addf(&buf, "option %s ", name);
294 quote_c_style(list->items[i].string, &buf, NULL, 0);
295 strbuf_addch(&buf, '\n');
296
297 if ((ret = strbuf_set_helper_option(data, &buf)))
298 break;
299 strbuf_reset(&buf);
300 }
301 strbuf_release(&buf);
302 return ret;
303}
304
ef08ef9e
SP
305static int set_helper_option(struct transport *transport,
306 const char *name, const char *value)
307{
308 struct helper_data *data = transport->data;
ef08ef9e
SP
309 struct strbuf buf = STRBUF_INIT;
310 int i, ret, is_bool = 0;
311
bf3c523c
IL
312 get_helper(transport);
313
ef08ef9e
SP
314 if (!data->option)
315 return 1;
316
a45a2600
NTND
317 if (!strcmp(name, "deepen-not"))
318 return string_list_set_helper_option(data, name,
319 (struct string_list *)value);
320
ef08ef9e
SP
321 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
322 if (!strcmp(name, unsupported_options[i]))
323 return 1;
324 }
325
326 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
327 if (!strcmp(name, boolean_options[i])) {
328 is_bool = 1;
329 break;
330 }
331 }
332
333 strbuf_addf(&buf, "option %s ", name);
334 if (is_bool)
335 strbuf_addstr(&buf, value ? "true" : "false");
336 else
337 quote_c_style(value, &buf, NULL, 0);
338 strbuf_addch(&buf, '\n');
339
9318c5dd 340 ret = strbuf_set_helper_option(data, &buf);
ef08ef9e
SP
341 strbuf_release(&buf);
342 return ret;
343}
344
345static void standard_options(struct transport *t)
346{
347 char buf[16];
ef08ef9e 348 int v = t->verbose;
ef08ef9e 349
d01b3c02 350 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e 351
8c5acfb9 352 xsnprintf(buf, sizeof(buf), "%d", v + 1);
ef08ef9e 353 set_helper_option(t, "verbosity", buf);
c915f11e
EW
354
355 switch (t->family) {
356 case TRANSPORT_FAMILY_ALL:
357 /*
358 * this is already the default,
359 * do not break old remote helpers by setting "all" here
360 */
361 break;
362 case TRANSPORT_FAMILY_IPV4:
363 set_helper_option(t, "family", "ipv4");
364 break;
365 case TRANSPORT_FAMILY_IPV6:
366 set_helper_option(t, "family", "ipv6");
367 break;
368 }
ef08ef9e
SP
369}
370
f2a37151
DB
371static int release_helper(struct transport *transport)
372{
cc567322 373 int res = 0;
72ff8943
DB
374 struct helper_data *data = transport->data;
375 free_refspec(data->refspec_nr, data->refspecs);
376 data->refspecs = NULL;
cc567322 377 res = disconnect_helper(transport);
f2a37151 378 free(transport->data);
cc567322 379 return res;
f2a37151
DB
380}
381
6eb996b5 382static int fetch_with_fetch(struct transport *transport,
37148311 383 int nr_heads, struct ref **to_fetch)
6eb996b5 384{
292ce46b 385 struct helper_data *data = transport->data;
6eb996b5
DB
386 int i;
387 struct strbuf buf = STRBUF_INIT;
388
389 for (i = 0; i < nr_heads; i++) {
1088261f 390 const struct ref *posn = to_fetch[i];
6eb996b5
DB
391 if (posn->status & REF_STATUS_UPTODATE)
392 continue;
2d14d65c
DB
393
394 strbuf_addf(&buf, "fetch %s %s\n",
f4e54d02 395 oid_to_hex(&posn->old_oid),
33cae542 396 posn->symref ? posn->symref : posn->name);
292ce46b 397 }
2d14d65c 398
292ce46b 399 strbuf_addch(&buf, '\n');
bf3c523c 400 sendline(data, &buf);
292ce46b
SP
401
402 while (1) {
5931b33e
FC
403 if (recvline(data, &buf))
404 exit(128);
292ce46b 405
59556548 406 if (starts_with(buf.buf, "lock ")) {
292ce46b
SP
407 const char *name = buf.buf + 5;
408 if (transport->pack_lockfile)
409 warning("%s also locked %s", data->name, name);
410 else
411 transport->pack_lockfile = xstrdup(name);
412 }
9ba38048
NTND
413 else if (data->check_connectivity &&
414 data->transport_options.check_self_contained_and_connected &&
415 !strcmp(buf.buf, "connectivity-ok"))
416 data->transport_options.self_contained_and_connected = 1;
292ce46b
SP
417 else if (!buf.len)
418 break;
419 else
420 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 421 }
292ce46b 422 strbuf_release(&buf);
6eb996b5
DB
423 return 0;
424}
425
e65e91ed
DB
426static int get_importer(struct transport *transport, struct child_process *fastimport)
427{
428 struct child_process *helper = get_helper(transport);
bfc366d9 429 struct helper_data *data = transport->data;
bfc366d9 430 int cat_blob_fd, code;
483bbd4e 431 child_process_init(fastimport);
e65e91ed 432 fastimport->in = helper->out;
173fd1a1
JK
433 argv_array_push(&fastimport->args, "fast-import");
434 argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
e65e91ed 435
bfc366d9
FA
436 if (data->bidi_import) {
437 cat_blob_fd = xdup(helper->in);
173fd1a1 438 argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
bfc366d9 439 }
e65e91ed 440 fastimport->git_cmd = 1;
bfc366d9
FA
441
442 code = start_command(fastimport);
443 return code;
e65e91ed
DB
444}
445
73b49a75
SR
446static int get_exporter(struct transport *transport,
447 struct child_process *fastexport,
73b49a75
SR
448 struct string_list *revlist_args)
449{
a515ebe9 450 struct helper_data *data = transport->data;
73b49a75 451 struct child_process *helper = get_helper(transport);
2aeae40a 452 int i;
852e54bc 453
8828f298 454 child_process_init(fastexport);
73b49a75
SR
455
456 /* we need to duplicate helper->in because we want to use it after
457 * fastexport is done with it. */
458 fastexport->out = dup(helper->in);
2aeae40a
JK
459 argv_array_push(&fastexport->args, "fast-export");
460 argv_array_push(&fastexport->args, "--use-done-feature");
461 argv_array_push(&fastexport->args, data->signed_tags ?
462 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
463 if (data->export_marks)
464 argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
465 if (data->import_marks)
466 argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
73b49a75
SR
467
468 for (i = 0; i < revlist_args->nr; i++)
2aeae40a 469 argv_array_push(&fastexport->args, revlist_args->items[i].string);
73b49a75
SR
470
471 fastexport->git_cmd = 1;
472 return start_command(fastexport);
473}
474
e65e91ed
DB
475static int fetch_with_import(struct transport *transport,
476 int nr_heads, struct ref **to_fetch)
477{
478 struct child_process fastimport;
72ff8943 479 struct helper_data *data = transport->data;
e65e91ed
DB
480 int i;
481 struct ref *posn;
482 struct strbuf buf = STRBUF_INIT;
483
bf3c523c
IL
484 get_helper(transport);
485
e65e91ed
DB
486 if (get_importer(transport, &fastimport))
487 die("Couldn't run fast-import");
488
489 for (i = 0; i < nr_heads; i++) {
490 posn = to_fetch[i];
491 if (posn->status & REF_STATUS_UPTODATE)
492 continue;
493
33cae542
MH
494 strbuf_addf(&buf, "import %s\n",
495 posn->symref ? posn->symref : posn->name);
bf3c523c 496 sendline(data, &buf);
e65e91ed
DB
497 strbuf_reset(&buf);
498 }
9504bc9d
SR
499
500 write_constant(data->helper->in, "\n");
bfc366d9
FA
501 /*
502 * remote-helpers that advertise the bidi-import capability are required to
503 * buffer the complete batch of import commands until this newline before
504 * sending data to fast-import.
505 * These helpers read back data from fast-import on their stdin, which could
506 * be mixed with import commands, otherwise.
507 */
9504bc9d 508
cc567322
SR
509 if (finish_command(&fastimport))
510 die("Error while running fast-import");
e65e91ed 511
dff9d65d
FA
512 /*
513 * The fast-import stream of a remote helper that advertises
514 * the "refspec" capability writes to the refs named after the
515 * right hand side of the first refspec matching each ref we
516 * were fetching.
517 *
518 * (If no "refspec" capability was specified, for historical
7a43c554 519 * reasons we default to the equivalent of *:*.)
dff9d65d
FA
520 *
521 * Store the result in to_fetch[i].old_sha1. Callers such
522 * as "git fetch" can use the value to write feedback to the
523 * terminal, populate FETCH_HEAD, and determine what new value
524 * should be written to peer_ref if the update is a
525 * fast-forward or this is a forced update.
526 */
e65e91ed 527 for (i = 0; i < nr_heads; i++) {
33cae542 528 char *private, *name;
e65e91ed
DB
529 posn = to_fetch[i];
530 if (posn->status & REF_STATUS_UPTODATE)
531 continue;
33cae542 532 name = posn->symref ? posn->symref : posn->name;
72ff8943 533 if (data->refspecs)
33cae542 534 private = apply_refspecs(data->refspecs, data->refspec_nr, name);
72ff8943 535 else
33cae542 536 private = xstrdup(name);
d51b720f 537 if (private) {
f4e54d02 538 if (read_ref(private, posn->old_oid.hash) < 0)
ae25fd39 539 die("Could not read ref %s", private);
d51b720f
MH
540 free(private);
541 }
e65e91ed 542 }
b962dbdc 543 strbuf_release(&buf);
e65e91ed
DB
544 return 0;
545}
546
fa8c097c
IL
547static int process_connect_service(struct transport *transport,
548 const char *name, const char *exec)
549{
550 struct helper_data *data = transport->data;
551 struct strbuf cmdbuf = STRBUF_INIT;
552 struct child_process *helper;
553 int r, duped, ret = 0;
554 FILE *input;
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
570 /*
571 * Handle --upload-pack and friends. This is fire and forget...
572 * just warn if it fails.
573 */
574 if (strcmp(name, exec)) {
575 r = set_helper_option(transport, "servpath", exec);
576 if (r > 0)
577 warning("Setting remote service path not supported by protocol.");
578 else if (r < 0)
579 warning("Invalid remote service path.");
580 }
581
582 if (data->connect)
583 strbuf_addf(&cmdbuf, "connect %s\n", name);
584 else
585 goto exit;
586
587 sendline(data, &cmdbuf);
5931b33e
FC
588 if (recvline_fh(input, &cmdbuf, name))
589 exit(128);
590
fa8c097c
IL
591 if (!strcmp(cmdbuf.buf, "")) {
592 data->no_disconnect_req = 1;
593 if (debug)
594 fprintf(stderr, "Debug: Smart transport connection "
595 "ready.\n");
596 ret = 1;
597 } else if (!strcmp(cmdbuf.buf, "fallback")) {
598 if (debug)
599 fprintf(stderr, "Debug: Falling back to dumb "
600 "transport.\n");
601 } else
602 die("Unknown response to connect: %s",
603 cmdbuf.buf);
604
605exit:
4168be8e 606 strbuf_release(&cmdbuf);
fa8c097c
IL
607 fclose(input);
608 return ret;
609}
610
611static int process_connect(struct transport *transport,
612 int for_push)
613{
614 struct helper_data *data = transport->data;
615 const char *name;
616 const char *exec;
617
618 name = for_push ? "git-receive-pack" : "git-upload-pack";
619 if (for_push)
620 exec = data->transport_options.receivepack;
621 else
622 exec = data->transport_options.uploadpack;
623
624 return process_connect_service(transport, name, exec);
625}
626
b236752a
IL
627static int connect_helper(struct transport *transport, const char *name,
628 const char *exec, int fd[2])
629{
630 struct helper_data *data = transport->data;
631
632 /* Get_helper so connect is inited. */
633 get_helper(transport);
634 if (!data->connect)
635 die("Operation not supported by protocol.");
636
637 if (!process_connect_service(transport, name, exec))
638 die("Can't connect to subservice %s.", name);
639
640 fd[0] = data->helper->out;
641 fd[1] = data->helper->in;
642 return 0;
643}
644
6eb996b5 645static int fetch(struct transport *transport,
37148311 646 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
647{
648 struct helper_data *data = transport->data;
649 int i, count;
650
fa8c097c
IL
651 if (process_connect(transport, 0)) {
652 do_take_over(transport);
653 return transport->fetch(transport, nr_heads, to_fetch);
654 }
655
6eb996b5
DB
656 count = 0;
657 for (i = 0; i < nr_heads; i++)
658 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
659 count++;
660
661 if (!count)
662 return 0;
663
aab1beb0
MH
664 if (data->check_connectivity &&
665 data->transport_options.check_self_contained_and_connected)
666 set_helper_option(transport, "check-connectivity", "true");
667
668 if (transport->cloning)
669 set_helper_option(transport, "cloning", "true");
670
671 if (data->transport_options.update_shallow)
672 set_helper_option(transport, "update-shallow", "true");
673
6eb996b5
DB
674 if (data->fetch)
675 return fetch_with_fetch(transport, nr_heads, to_fetch);
676
e65e91ed
DB
677 if (data->import)
678 return fetch_with_import(transport, nr_heads, to_fetch);
679
6eb996b5
DB
680 return -1;
681}
682
664059fb 683static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
684 struct ref **ref,
685 struct ref *remote_refs)
686{
687 char *refname, *msg;
f9e3c6be 688 int status, forced = 0;
d2e73c6f 689
59556548 690 if (starts_with(buf->buf, "ok ")) {
d2e73c6f
SR
691 status = REF_STATUS_OK;
692 refname = buf->buf + 3;
59556548 693 } else if (starts_with(buf->buf, "error ")) {
d2e73c6f
SR
694 status = REF_STATUS_REMOTE_REJECT;
695 refname = buf->buf + 6;
696 } else
82247e9b 697 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
698
699 msg = strchr(refname, ' ');
700 if (msg) {
701 struct strbuf msg_buf = STRBUF_INIT;
702 const char *end;
703
704 *msg++ = '\0';
705 if (!unquote_c_style(&msg_buf, msg, &end))
706 msg = strbuf_detach(&msg_buf, NULL);
707 else
708 msg = xstrdup(msg);
709 strbuf_release(&msg_buf);
710
711 if (!strcmp(msg, "no match")) {
712 status = REF_STATUS_NONE;
6a83d902 713 FREE_AND_NULL(msg);
d2e73c6f
SR
714 }
715 else if (!strcmp(msg, "up to date")) {
716 status = REF_STATUS_UPTODATE;
6a83d902 717 FREE_AND_NULL(msg);
d2e73c6f
SR
718 }
719 else if (!strcmp(msg, "non-fast forward")) {
720 status = REF_STATUS_REJECT_NONFASTFORWARD;
6a83d902 721 FREE_AND_NULL(msg);
d2e73c6f 722 }
dbfeddb1
CR
723 else if (!strcmp(msg, "already exists")) {
724 status = REF_STATUS_REJECT_ALREADY_EXISTS;
6a83d902 725 FREE_AND_NULL(msg);
dbfeddb1 726 }
75e5c0dc
JH
727 else if (!strcmp(msg, "fetch first")) {
728 status = REF_STATUS_REJECT_FETCH_FIRST;
6a83d902 729 FREE_AND_NULL(msg);
75e5c0dc
JH
730 }
731 else if (!strcmp(msg, "needs force")) {
732 status = REF_STATUS_REJECT_NEEDS_FORCE;
6a83d902 733 FREE_AND_NULL(msg);
75e5c0dc 734 }
631b5ef2
JH
735 else if (!strcmp(msg, "stale info")) {
736 status = REF_STATUS_REJECT_STALE;
6a83d902 737 FREE_AND_NULL(msg);
631b5ef2 738 }
f9e3c6be
FC
739 else if (!strcmp(msg, "forced update")) {
740 forced = 1;
6a83d902 741 FREE_AND_NULL(msg);
f9e3c6be 742 }
d2e73c6f
SR
743 }
744
745 if (*ref)
746 *ref = find_ref_by_name(*ref, refname);
747 if (!*ref)
748 *ref = find_ref_by_name(remote_refs, refname);
749 if (!*ref) {
750 warning("helper reported unexpected status of %s", refname);
664059fb 751 return 1;
d2e73c6f
SR
752 }
753
754 if ((*ref)->status != REF_STATUS_NONE) {
755 /*
756 * Earlier, the ref was marked not to be pushed, so ignore the ref
757 * status reported by the remote helper if the latter is 'no match'.
758 */
759 if (status == REF_STATUS_NONE)
664059fb 760 return 1;
d2e73c6f
SR
761 }
762
763 (*ref)->status = status;
cf31f70c 764 (*ref)->forced_update |= forced;
d2e73c6f 765 (*ref)->remote_status = msg;
126aac5c 766 return !(status == REF_STATUS_OK);
d2e73c6f
SR
767}
768
0551a06c 769static int push_update_refs_status(struct helper_data *data,
5a75353f
FC
770 struct ref *remote_refs,
771 int flags)
d2e73c6f
SR
772{
773 struct strbuf buf = STRBUF_INIT;
774 struct ref *ref = remote_refs;
0551a06c
FC
775 int ret = 0;
776
d2e73c6f 777 for (;;) {
664059fb
FC
778 char *private;
779
0551a06c
FC
780 if (recvline(data, &buf)) {
781 ret = 1;
782 break;
783 }
784
d2e73c6f
SR
785 if (!buf.len)
786 break;
787
664059fb
FC
788 if (push_update_ref_status(&buf, &ref, remote_refs))
789 continue;
790
5a75353f 791 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
664059fb
FC
792 continue;
793
794 /* propagate back the update to the remote namespace */
795 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
796 if (!private)
797 continue;
ae077771 798 update_ref("update by helper", private, &ref->new_oid, NULL,
799 0, 0);
664059fb 800 free(private);
d2e73c6f
SR
801 }
802 strbuf_release(&buf);
0551a06c 803 return ret;
d2e73c6f
SR
804}
805
30261094
DB
806static void set_common_push_options(struct transport *transport,
807 const char *name, int flags)
808{
809 if (flags & TRANSPORT_PUSH_DRY_RUN) {
810 if (set_helper_option(transport, "dry-run", "true") != 0)
811 die("helper %s does not support dry-run", name);
812 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
813 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
814 die("helper %s does not support --signed", name);
815 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
816 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
817 die("helper %s does not support --signed=if-asked", name);
818 }
438fc684
SB
819
820 if (flags & TRANSPORT_PUSH_OPTIONS) {
821 struct string_list_item *item;
822 for_each_string_list_item(item, transport->push_options)
823 if (set_helper_option(transport, "push-option", item->string) != 0)
824 die("helper %s does not support 'push-option'", name);
825 }
30261094
DB
826}
827
73b49a75 828static int push_refs_with_push(struct transport *transport,
05c1eb10 829 struct ref *remote_refs, int flags)
ae4efe19
SP
830{
831 int force_all = flags & TRANSPORT_PUSH_FORCE;
832 int mirror = flags & TRANSPORT_PUSH_MIRROR;
833 struct helper_data *data = transport->data;
834 struct strbuf buf = STRBUF_INIT;
ae4efe19 835 struct ref *ref;
05c1eb10
JH
836 struct string_list cas_options = STRING_LIST_INIT_DUP;
837 struct string_list_item *cas_option;
ae4efe19 838
c0aa335c 839 get_helper(transport);
ae4efe19
SP
840 if (!data->push)
841 return 1;
842
843 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 844 if (!ref->peer_ref && !mirror)
ae4efe19
SP
845 continue;
846
20e8b465
TRC
847 /* Check for statuses set by set_ref_status_for_push() */
848 switch (ref->status) {
849 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 850 case REF_STATUS_REJECT_STALE:
dbfeddb1 851 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 852 case REF_STATUS_UPTODATE:
ae4efe19 853 continue;
20e8b465
TRC
854 default:
855 ; /* do nothing */
ae4efe19
SP
856 }
857
858 if (force_all)
859 ref->force = 1;
860
861 strbuf_addstr(&buf, "push ");
862 if (!ref->deletion) {
863 if (ref->force)
864 strbuf_addch(&buf, '+');
865 if (ref->peer_ref)
866 strbuf_addstr(&buf, ref->peer_ref->name);
867 else
f4e54d02 868 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
ae4efe19
SP
869 }
870 strbuf_addch(&buf, ':');
871 strbuf_addstr(&buf, ref->name);
872 strbuf_addch(&buf, '\n');
05c1eb10
JH
873
874 /*
875 * The "--force-with-lease" options without explicit
876 * values to expect have already been expanded into
f4e54d02 877 * the ref->old_oid_expect[] field; we can ignore
05c1eb10
JH
878 * transport->smart_options->cas altogether and instead
879 * can enumerate them from the refs.
880 */
881 if (ref->expect_old_sha1) {
882 struct strbuf cas = STRBUF_INIT;
883 strbuf_addf(&cas, "%s:%s",
f4e54d02 884 ref->name, oid_to_hex(&ref->old_oid_expect));
05c1eb10
JH
885 string_list_append(&cas_options, strbuf_detach(&cas, NULL));
886 }
ae4efe19 887 }
05c1eb10
JH
888 if (buf.len == 0) {
889 string_list_clear(&cas_options, 0);
d8f67d20 890 return 0;
05c1eb10 891 }
ae4efe19 892
05c1eb10
JH
893 for_each_string_list_item(cas_option, &cas_options)
894 set_helper_option(transport, "cas", cas_option->string);
30261094 895 set_common_push_options(transport, data->name, flags);
ae4efe19
SP
896
897 strbuf_addch(&buf, '\n');
bf3c523c 898 sendline(data, &buf);
ae4efe19 899 strbuf_release(&buf);
d2e73c6f 900
0551a06c 901 return push_update_refs_status(data, remote_refs, flags);
ae4efe19
SP
902}
903
73b49a75
SR
904static int push_refs_with_export(struct transport *transport,
905 struct ref *remote_refs, int flags)
906{
907 struct ref *ref;
908 struct child_process *helper, exporter;
909 struct helper_data *data = transport->data;
d98c8153 910 struct string_list revlist_args = STRING_LIST_INIT_DUP;
73b49a75
SR
911 struct strbuf buf = STRBUF_INIT;
912
21610d82
FC
913 if (!data->refspecs)
914 die("remote-helper doesn't support push; refspec needed");
915
30261094 916 set_common_push_options(transport, data->name, flags);
510fa6f5
FC
917 if (flags & TRANSPORT_PUSH_FORCE) {
918 if (set_helper_option(transport, "force", "true") != 0)
919 warning("helper %s does not support 'force'", data->name);
920 }
921
73b49a75
SR
922 helper = get_helper(transport);
923
924 write_constant(helper->in, "export\n");
925
73b49a75
SR
926 for (ref = remote_refs; ref; ref = ref->next) {
927 char *private;
27912a03 928 struct object_id oid;
73b49a75 929
73b49a75 930 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
e82caf38 931 if (private && !get_oid(private, &oid)) {
73b49a75 932 strbuf_addf(&buf, "^%s", private);
1d2f80fa 933 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
27912a03 934 oidcpy(&ref->old_oid, &oid);
73b49a75 935 }
2faa1527 936 free(private);
73b49a75 937
67c9c782 938 if (ref->peer_ref) {
d98c8153 939 if (strcmp(ref->name, ref->peer_ref->name)) {
f3d03763
FC
940 if (!ref->deletion) {
941 const char *name;
942 int flag;
943
944 /* Follow symbolic refs (mainly for HEAD). */
7695d118
RS
945 name = resolve_ref_unsafe(
946 ref->peer_ref->name,
947 RESOLVE_REF_READING,
27912a03 948 oid.hash, &flag);
f3d03763
FC
949 if (!name || !(flag & REF_ISSYMREF))
950 name = ref->peer_ref->name;
9193f742 951
f3d03763
FC
952 strbuf_addf(&buf, "%s:%s", name, ref->name);
953 } else
954 strbuf_addf(&buf, ":%s", ref->name);
9193f742 955
d98c8153
FC
956 string_list_append(&revlist_args, "--refspec");
957 string_list_append(&revlist_args, buf.buf);
958 strbuf_release(&buf);
959 }
f3d03763
FC
960 if (!ref->deletion)
961 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 962 }
73b49a75
SR
963 }
964
a515ebe9 965 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
966 die("Couldn't run fast-export");
967
d98c8153
FC
968 string_list_clear(&revlist_args, 1);
969
cc567322
SR
970 if (finish_command(&exporter))
971 die("Error while running fast-export");
3994e64d
FC
972 if (push_update_refs_status(data, remote_refs, flags))
973 return 1;
974
975 if (data->export_marks) {
976 strbuf_addf(&buf, "%s.tmp", data->export_marks);
977 rename(buf.buf, data->export_marks);
978 strbuf_release(&buf);
979 }
980
981 return 0;
73b49a75
SR
982}
983
984static int push_refs(struct transport *transport,
985 struct ref *remote_refs, int flags)
986{
987 struct helper_data *data = transport->data;
988
989 if (process_connect(transport, 1)) {
990 do_take_over(transport);
991 return transport->push_refs(transport, remote_refs, flags);
992 }
993
994 if (!remote_refs) {
995 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
996 "Perhaps you should specify a branch such as 'master'.\n");
997 return 0;
998 }
999
1000 if (data->push)
1001 return push_refs_with_push(transport, remote_refs, flags);
1002
1003 if (data->export)
1004 return push_refs_with_export(transport, remote_refs, flags);
1005
1006 return -1;
1007}
1008
1009
f8ec9167
DB
1010static int has_attribute(const char *attrs, const char *attr) {
1011 int len;
1012 if (!attrs)
1013 return 0;
1014
1015 len = strlen(attr);
1016 for (;;) {
1017 const char *space = strchrnul(attrs, ' ');
1018 if (len == space - attrs && !strncmp(attrs, attr, len))
1019 return 1;
1020 if (!*space)
1021 return 0;
1022 attrs = space + 1;
1023 }
1024}
1025
6eb996b5
DB
1026static struct ref *get_refs_list(struct transport *transport, int for_push)
1027{
292ce46b 1028 struct helper_data *data = transport->data;
6eb996b5
DB
1029 struct child_process *helper;
1030 struct ref *ret = NULL;
1031 struct ref **tail = &ret;
1032 struct ref *posn;
1033 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
1034
1035 helper = get_helper(transport);
2d14d65c 1036
fa8c097c
IL
1037 if (process_connect(transport, for_push)) {
1038 do_take_over(transport);
1039 return transport->get_refs_list(transport, for_push);
1040 }
1041
ae4efe19
SP
1042 if (data->push && for_push)
1043 write_str_in_full(helper->in, "list for-push\n");
1044 else
1045 write_str_in_full(helper->in, "list\n");
6eb996b5 1046
6eb996b5
DB
1047 while (1) {
1048 char *eov, *eon;
5931b33e
FC
1049 if (recvline(data, &buf))
1050 exit(128);
6eb996b5
DB
1051
1052 if (!*buf.buf)
1053 break;
1054
1055 eov = strchr(buf.buf, ' ');
1056 if (!eov)
1057 die("Malformed response in ref list: %s", buf.buf);
1058 eon = strchr(eov + 1, ' ');
1059 *eov = '\0';
1060 if (eon)
1061 *eon = '\0';
1062 *tail = alloc_ref(eov + 1);
1063 if (buf.buf[0] == '@')
1064 (*tail)->symref = xstrdup(buf.buf + 1);
1065 else if (buf.buf[0] != '?')
f4e54d02 1066 get_oid_hex(buf.buf, &(*tail)->old_oid);
f8ec9167
DB
1067 if (eon) {
1068 if (has_attribute(eon + 1, "unchanged")) {
1069 (*tail)->status |= REF_STATUS_UPTODATE;
ae25fd39 1070 if (read_ref((*tail)->name,
f4e54d02 1071 (*tail)->old_oid.hash) < 0)
3c5077fe 1072 die(_("Could not read ref %s"),
ae25fd39 1073 (*tail)->name);
f8ec9167
DB
1074 }
1075 }
6eb996b5
DB
1076 tail = &((*tail)->next);
1077 }
bf3c523c
IL
1078 if (debug)
1079 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
1080 strbuf_release(&buf);
1081
1082 for (posn = ret; posn; posn = posn->next)
1083 resolve_remote_symref(posn, ret);
1084
1085 return ret;
1086}
1087
c9e388bb 1088int transport_helper_init(struct transport *transport, const char *name)
6eb996b5 1089{
92e25b6b 1090 struct helper_data *data = xcalloc(1, sizeof(*data));
c9e388bb 1091 data->name = name;
6eb996b5 1092
a5adaced
JK
1093 transport_check_allowed(name);
1094
bf3c523c
IL
1095 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1096 debug = 1;
1097
6eb996b5 1098 transport->data = data;
ef08ef9e 1099 transport->set_option = set_helper_option;
6eb996b5
DB
1100 transport->get_refs_list = get_refs_list;
1101 transport->fetch = fetch;
ae4efe19 1102 transport->push_refs = push_refs;
f2a37151 1103 transport->disconnect = release_helper;
b236752a 1104 transport->connect = connect_helper;
61b075bd 1105 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1106 return 0;
1107}
419f37db
IL
1108
1109/*
1110 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1111 * buffer less), so attempt reads and writes with up to that size.
1112 */
1113#define BUFFERSIZE 65536
1114/* This should be enough to hold debugging message. */
1115#define PBUFFERSIZE 8192
1116
1117/* Print bidirectional transfer loop debug message. */
4621085b 1118__attribute__((format (printf, 1, 2)))
419f37db
IL
1119static void transfer_debug(const char *fmt, ...)
1120{
6cdf8a79
1121 /*
1122 * NEEDSWORK: This function is sometimes used from multiple threads, and
1123 * we end up using debug_enabled racily. That "should not matter" since
1124 * we always write the same value, but it's still wrong. This function
1125 * is listed in .tsan-suppressions for the time being.
1126 */
1127
419f37db
IL
1128 va_list args;
1129 char msgbuf[PBUFFERSIZE];
1130 static int debug_enabled = -1;
1131
1132 if (debug_enabled < 0)
1133 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1134 if (!debug_enabled)
1135 return;
1136
1137 va_start(args, fmt);
1138 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1139 va_end(args);
1140 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1141}
1142
1143/* Stream state: More data may be coming in this direction. */
2e3a16b2 1144#define SSTATE_TRANSFERRING 0
419f37db
IL
1145/*
1146 * Stream state: No more data coming in this direction, flushing rest of
1147 * data.
1148 */
1149#define SSTATE_FLUSHING 1
1150/* Stream state: Transfer in this direction finished. */
1151#define SSTATE_FINISHED 2
1152
2e3a16b2 1153#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
419f37db
IL
1154#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1155#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1156
1157/* Unidirectional transfer. */
1158struct unidirectional_transfer {
1159 /* Source */
1160 int src;
1161 /* Destination */
1162 int dest;
1163 /* Is source socket? */
1164 int src_is_sock;
1165 /* Is destination socket? */
1166 int dest_is_sock;
41ccfdd9 1167 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1168 int state;
1169 /* Buffer. */
1170 char buf[BUFFERSIZE];
1171 /* Buffer used. */
1172 size_t bufuse;
1173 /* Name of source. */
1174 const char *src_name;
1175 /* Name of destination. */
1176 const char *dest_name;
1177};
1178
1179/* Closes the target (for writing) if transfer has finished. */
1180static void udt_close_if_finished(struct unidirectional_transfer *t)
1181{
1182 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1183 t->state = SSTATE_FINISHED;
1184 if (t->dest_is_sock)
1185 shutdown(t->dest, SHUT_WR);
1186 else
1187 close(t->dest);
1188 transfer_debug("Closed %s.", t->dest_name);
1189 }
1190}
1191
1192/*
832c0e5e 1193 * Tries to read data from source into buffer. If buffer is full,
419f37db
IL
1194 * no data is read. Returns 0 on success, -1 on error.
1195 */
1196static int udt_do_read(struct unidirectional_transfer *t)
1197{
1198 ssize_t bytes;
1199
1200 if (t->bufuse == BUFFERSIZE)
1201 return 0; /* No space for more. */
1202
1203 transfer_debug("%s is readable", t->src_name);
1204 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1205 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1206 errno != EINTR) {
1fee1dce 1207 error_errno("read(%s) failed", t->src_name);
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1208 return -1;
1209 } else if (bytes == 0) {
1210 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1211 t->src_name, (int)t->bufuse);
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1212 t->state = SSTATE_FLUSHING;
1213 } else if (bytes > 0) {
1214 t->bufuse += bytes;
1215 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1216 (int)bytes, t->src_name, (int)t->bufuse);
1217 }
1218 return 0;
1219}
1220
1221/* Tries to write data from buffer into destination. If buffer is empty,
1222 * no data is written. Returns 0 on success, -1 on error.
1223 */
1224static int udt_do_write(struct unidirectional_transfer *t)
1225{
803dbdb9 1226 ssize_t bytes;
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1227
1228 if (t->bufuse == 0)
1229 return 0; /* Nothing to write. */
1230
1231 transfer_debug("%s is writable", t->dest_name);
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1232 bytes = xwrite(t->dest, t->buf, t->bufuse);
1233 if (bytes < 0 && errno != EWOULDBLOCK) {
1fee1dce 1234 error_errno("write(%s) failed", t->dest_name);
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1235 return -1;
1236 } else if (bytes > 0) {
1237 t->bufuse -= bytes;
1238 if (t->bufuse)
1239 memmove(t->buf, t->buf + bytes, t->bufuse);
1240 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1241 (int)bytes, t->dest_name, (int)t->bufuse);
1242 }
1243 return 0;
1244}
1245
1246
1247/* State of bidirectional transfer loop. */
1248struct bidirectional_transfer_state {
1249 /* Direction from program to git. */
1250 struct unidirectional_transfer ptg;
1251 /* Direction from git to program. */
1252 struct unidirectional_transfer gtp;
1253};
1254
1255static void *udt_copy_task_routine(void *udt)
1256{
1257 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1258 while (t->state != SSTATE_FINISHED) {
1259 if (STATE_NEEDS_READING(t->state))
1260 if (udt_do_read(t))
1261 return NULL;
1262 if (STATE_NEEDS_WRITING(t->state))
1263 if (udt_do_write(t))
1264 return NULL;
1265 if (STATE_NEEDS_CLOSING(t->state))
1266 udt_close_if_finished(t);
1267 }
1268 return udt; /* Just some non-NULL value. */
1269}
1270
1271#ifndef NO_PTHREADS
1272
1273/*
98e023de 1274 * Join thread, with appropriate errors on failure. Name is name for the
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1275 * thread (for error messages). Returns 0 on success, 1 on failure.
1276 */
1277static int tloop_join(pthread_t thread, const char *name)
1278{
1279 int err;
1280 void *tret;
1281 err = pthread_join(thread, &tret);
1282 if (!tret) {
1283 error("%s thread failed", name);
1284 return 1;
1285 }
1286 if (err) {
1287 error("%s thread failed to join: %s", name, strerror(err));
1288 return 1;
1289 }
1290 return 0;
1291}
1292
1293/*
1294 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1295 * -1 on failure.
1296 */
1297static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1298{
1299 pthread_t gtp_thread;
1300 pthread_t ptg_thread;
1301 int err;
1302 int ret = 0;
1303 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1304 &s->gtp);
1305 if (err)
1306 die("Can't start thread for copying data: %s", strerror(err));
1307 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1308 &s->ptg);
1309 if (err)
1310 die("Can't start thread for copying data: %s", strerror(err));
1311
1312 ret |= tloop_join(gtp_thread, "Git to program copy");
1313 ret |= tloop_join(ptg_thread, "Program to git copy");
1314 return ret;
1315}
1316#else
1317
1318/* Close the source and target (for writing) for transfer. */
1319static void udt_kill_transfer(struct unidirectional_transfer *t)
1320{
1321 t->state = SSTATE_FINISHED;
1322 /*
1323 * Socket read end left open isn't a disaster if nobody
1324 * attempts to read from it (mingw compat headers do not
1325 * have SHUT_RD)...
1326 *
1327 * We can't fully close the socket since otherwise gtp
1328 * task would first close the socket it sends data to
1329 * while closing the ptg file descriptors.
1330 */
1331 if (!t->src_is_sock)
1332 close(t->src);
1333 if (t->dest_is_sock)
1334 shutdown(t->dest, SHUT_WR);
1335 else
1336 close(t->dest);
1337}
1338
1339/*
98e023de 1340 * Join process, with appropriate errors on failure. Name is name for the
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1341 * process (for error messages). Returns 0 on success, 1 on failure.
1342 */
1343static int tloop_join(pid_t pid, const char *name)
1344{
1345 int tret;
1346 if (waitpid(pid, &tret, 0) < 0) {
1fee1dce 1347 error_errno("%s process failed to wait", name);
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1348 return 1;
1349 }
1350 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1351 error("%s process failed", name);
1352 return 1;
1353 }
1354 return 0;
1355}
1356
1357/*
1358 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1359 * -1 on failure.
1360 */
1361static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1362{
1363 pid_t pid1, pid2;
1364 int ret = 0;
1365
1366 /* Fork thread #1: git to program. */
1367 pid1 = fork();
1368 if (pid1 < 0)
1369 die_errno("Can't start thread for copying data");
1370 else if (pid1 == 0) {
1371 udt_kill_transfer(&s->ptg);
1372 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1373 }
1374
1375 /* Fork thread #2: program to git. */
1376 pid2 = fork();
1377 if (pid2 < 0)
1378 die_errno("Can't start thread for copying data");
1379 else if (pid2 == 0) {
1380 udt_kill_transfer(&s->gtp);
1381 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1382 }
1383
1384 /*
1385 * Close both streams in parent as to not interfere with
1386 * end of file detection and wait for both tasks to finish.
1387 */
1388 udt_kill_transfer(&s->gtp);
1389 udt_kill_transfer(&s->ptg);
1390 ret |= tloop_join(pid1, "Git to program copy");
1391 ret |= tloop_join(pid2, "Program to git copy");
1392 return ret;
1393}
1394#endif
1395
1396/*
1397 * Copies data from stdin to output and from input to stdout simultaneously.
1398 * Additionally filtering through given filter. If filter is NULL, uses
1399 * identity filter.
1400 */
1401int bidirectional_transfer_loop(int input, int output)
1402{
1403 struct bidirectional_transfer_state state;
1404
1405 /* Fill the state fields. */
1406 state.ptg.src = input;
1407 state.ptg.dest = 1;
1408 state.ptg.src_is_sock = (input == output);
1409 state.ptg.dest_is_sock = 0;
2e3a16b2 1410 state.ptg.state = SSTATE_TRANSFERRING;
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1411 state.ptg.bufuse = 0;
1412 state.ptg.src_name = "remote input";
1413 state.ptg.dest_name = "stdout";
1414
1415 state.gtp.src = 0;
1416 state.gtp.dest = output;
1417 state.gtp.src_is_sock = 0;
1418 state.gtp.dest_is_sock = (input == output);
2e3a16b2 1419 state.gtp.state = SSTATE_TRANSFERRING;
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1420 state.gtp.bufuse = 0;
1421 state.gtp.src_name = "stdin";
1422 state.gtp.dest_name = "remote output";
1423
1424 return tloop_spawnwait_tasks(&state);
1425}