transport-helper: remove name parameter
[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
fa8c097c
IL
548static int process_connect_service(struct transport *transport,
549 const char *name, const char *exec)
550{
551 struct helper_data *data = transport->data;
552 struct strbuf cmdbuf = STRBUF_INIT;
553 struct child_process *helper;
554 int r, duped, ret = 0;
555 FILE *input;
556
557 helper = get_helper(transport);
558
559 /*
560 * Yes, dup the pipe another time, as we need unbuffered version
561 * of input pipe as FILE*. fclose() closes the underlying fd and
562 * stream buffering only can be changed before first I/O operation
563 * on it.
564 */
565 duped = dup(helper->out);
566 if (duped < 0)
567 die_errno("Can't dup helper output fd");
568 input = xfdopen(duped, "r");
569 setvbuf(input, NULL, _IONBF, 0);
570
571 /*
572 * Handle --upload-pack and friends. This is fire and forget...
573 * just warn if it fails.
574 */
575 if (strcmp(name, exec)) {
576 r = set_helper_option(transport, "servpath", exec);
577 if (r > 0)
578 warning("Setting remote service path not supported by protocol.");
579 else if (r < 0)
580 warning("Invalid remote service path.");
581 }
582
583 if (data->connect)
584 strbuf_addf(&cmdbuf, "connect %s\n", name);
585 else
586 goto exit;
587
588 sendline(data, &cmdbuf);
b1c2edfc 589 if (recvline_fh(input, &cmdbuf))
5931b33e
FC
590 exit(128);
591
fa8c097c
IL
592 if (!strcmp(cmdbuf.buf, "")) {
593 data->no_disconnect_req = 1;
594 if (debug)
595 fprintf(stderr, "Debug: Smart transport connection "
596 "ready.\n");
597 ret = 1;
598 } else if (!strcmp(cmdbuf.buf, "fallback")) {
599 if (debug)
600 fprintf(stderr, "Debug: Falling back to dumb "
601 "transport.\n");
602 } else
603 die("Unknown response to connect: %s",
604 cmdbuf.buf);
605
606exit:
4168be8e 607 strbuf_release(&cmdbuf);
fa8c097c
IL
608 fclose(input);
609 return ret;
610}
611
612static int process_connect(struct transport *transport,
613 int for_push)
614{
615 struct helper_data *data = transport->data;
616 const char *name;
617 const char *exec;
618
619 name = for_push ? "git-receive-pack" : "git-upload-pack";
620 if (for_push)
621 exec = data->transport_options.receivepack;
622 else
623 exec = data->transport_options.uploadpack;
624
625 return process_connect_service(transport, name, exec);
626}
627
b236752a
IL
628static int connect_helper(struct transport *transport, const char *name,
629 const char *exec, int fd[2])
630{
631 struct helper_data *data = transport->data;
632
633 /* Get_helper so connect is inited. */
634 get_helper(transport);
635 if (!data->connect)
636 die("Operation not supported by protocol.");
637
638 if (!process_connect_service(transport, name, exec))
639 die("Can't connect to subservice %s.", name);
640
641 fd[0] = data->helper->out;
642 fd[1] = data->helper->in;
643 return 0;
644}
645
6eb996b5 646static int fetch(struct transport *transport,
37148311 647 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
648{
649 struct helper_data *data = transport->data;
650 int i, count;
651
fa8c097c
IL
652 if (process_connect(transport, 0)) {
653 do_take_over(transport);
e967ca38 654 return transport->vtable->fetch(transport, nr_heads, to_fetch);
fa8c097c
IL
655 }
656
6eb996b5
DB
657 count = 0;
658 for (i = 0; i < nr_heads; i++)
659 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
660 count++;
661
662 if (!count)
663 return 0;
664
aab1beb0
MH
665 if (data->check_connectivity &&
666 data->transport_options.check_self_contained_and_connected)
667 set_helper_option(transport, "check-connectivity", "true");
668
669 if (transport->cloning)
670 set_helper_option(transport, "cloning", "true");
671
672 if (data->transport_options.update_shallow)
673 set_helper_option(transport, "update-shallow", "true");
674
6eb996b5
DB
675 if (data->fetch)
676 return fetch_with_fetch(transport, nr_heads, to_fetch);
677
e65e91ed
DB
678 if (data->import)
679 return fetch_with_import(transport, nr_heads, to_fetch);
680
6eb996b5
DB
681 return -1;
682}
683
664059fb 684static int push_update_ref_status(struct strbuf *buf,
d2e73c6f
SR
685 struct ref **ref,
686 struct ref *remote_refs)
687{
688 char *refname, *msg;
f9e3c6be 689 int status, forced = 0;
d2e73c6f 690
59556548 691 if (starts_with(buf->buf, "ok ")) {
d2e73c6f
SR
692 status = REF_STATUS_OK;
693 refname = buf->buf + 3;
59556548 694 } else if (starts_with(buf->buf, "error ")) {
d2e73c6f
SR
695 status = REF_STATUS_REMOTE_REJECT;
696 refname = buf->buf + 6;
697 } else
82247e9b 698 die("expected ok/error, helper said '%s'", buf->buf);
d2e73c6f
SR
699
700 msg = strchr(refname, ' ');
701 if (msg) {
702 struct strbuf msg_buf = STRBUF_INIT;
703 const char *end;
704
705 *msg++ = '\0';
706 if (!unquote_c_style(&msg_buf, msg, &end))
707 msg = strbuf_detach(&msg_buf, NULL);
708 else
709 msg = xstrdup(msg);
710 strbuf_release(&msg_buf);
711
712 if (!strcmp(msg, "no match")) {
713 status = REF_STATUS_NONE;
6a83d902 714 FREE_AND_NULL(msg);
d2e73c6f
SR
715 }
716 else if (!strcmp(msg, "up to date")) {
717 status = REF_STATUS_UPTODATE;
6a83d902 718 FREE_AND_NULL(msg);
d2e73c6f
SR
719 }
720 else if (!strcmp(msg, "non-fast forward")) {
721 status = REF_STATUS_REJECT_NONFASTFORWARD;
6a83d902 722 FREE_AND_NULL(msg);
d2e73c6f 723 }
dbfeddb1
CR
724 else if (!strcmp(msg, "already exists")) {
725 status = REF_STATUS_REJECT_ALREADY_EXISTS;
6a83d902 726 FREE_AND_NULL(msg);
dbfeddb1 727 }
75e5c0dc
JH
728 else if (!strcmp(msg, "fetch first")) {
729 status = REF_STATUS_REJECT_FETCH_FIRST;
6a83d902 730 FREE_AND_NULL(msg);
75e5c0dc
JH
731 }
732 else if (!strcmp(msg, "needs force")) {
733 status = REF_STATUS_REJECT_NEEDS_FORCE;
6a83d902 734 FREE_AND_NULL(msg);
75e5c0dc 735 }
631b5ef2
JH
736 else if (!strcmp(msg, "stale info")) {
737 status = REF_STATUS_REJECT_STALE;
6a83d902 738 FREE_AND_NULL(msg);
631b5ef2 739 }
f9e3c6be
FC
740 else if (!strcmp(msg, "forced update")) {
741 forced = 1;
6a83d902 742 FREE_AND_NULL(msg);
f9e3c6be 743 }
d2e73c6f
SR
744 }
745
746 if (*ref)
747 *ref = find_ref_by_name(*ref, refname);
748 if (!*ref)
749 *ref = find_ref_by_name(remote_refs, refname);
750 if (!*ref) {
751 warning("helper reported unexpected status of %s", refname);
664059fb 752 return 1;
d2e73c6f
SR
753 }
754
755 if ((*ref)->status != REF_STATUS_NONE) {
756 /*
757 * Earlier, the ref was marked not to be pushed, so ignore the ref
758 * status reported by the remote helper if the latter is 'no match'.
759 */
760 if (status == REF_STATUS_NONE)
664059fb 761 return 1;
d2e73c6f
SR
762 }
763
764 (*ref)->status = status;
cf31f70c 765 (*ref)->forced_update |= forced;
d2e73c6f 766 (*ref)->remote_status = msg;
126aac5c 767 return !(status == REF_STATUS_OK);
d2e73c6f
SR
768}
769
0551a06c 770static int push_update_refs_status(struct helper_data *data,
5a75353f
FC
771 struct ref *remote_refs,
772 int flags)
d2e73c6f
SR
773{
774 struct strbuf buf = STRBUF_INIT;
775 struct ref *ref = remote_refs;
0551a06c
FC
776 int ret = 0;
777
d2e73c6f 778 for (;;) {
664059fb
FC
779 char *private;
780
0551a06c
FC
781 if (recvline(data, &buf)) {
782 ret = 1;
783 break;
784 }
785
d2e73c6f
SR
786 if (!buf.len)
787 break;
788
664059fb
FC
789 if (push_update_ref_status(&buf, &ref, remote_refs))
790 continue;
791
5a75353f 792 if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
664059fb
FC
793 continue;
794
795 /* propagate back the update to the remote namespace */
796 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
797 if (!private)
798 continue;
ae077771 799 update_ref("update by helper", private, &ref->new_oid, NULL,
800 0, 0);
664059fb 801 free(private);
d2e73c6f
SR
802 }
803 strbuf_release(&buf);
0551a06c 804 return ret;
d2e73c6f
SR
805}
806
30261094
DB
807static void set_common_push_options(struct transport *transport,
808 const char *name, int flags)
809{
810 if (flags & TRANSPORT_PUSH_DRY_RUN) {
811 if (set_helper_option(transport, "dry-run", "true") != 0)
812 die("helper %s does not support dry-run", name);
813 } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
814 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
815 die("helper %s does not support --signed", name);
816 } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
817 if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
818 die("helper %s does not support --signed=if-asked", name);
819 }
438fc684
SB
820
821 if (flags & TRANSPORT_PUSH_OPTIONS) {
822 struct string_list_item *item;
823 for_each_string_list_item(item, transport->push_options)
824 if (set_helper_option(transport, "push-option", item->string) != 0)
825 die("helper %s does not support 'push-option'", name);
826 }
30261094
DB
827}
828
73b49a75 829static int push_refs_with_push(struct transport *transport,
05c1eb10 830 struct ref *remote_refs, int flags)
ae4efe19
SP
831{
832 int force_all = flags & TRANSPORT_PUSH_FORCE;
833 int mirror = flags & TRANSPORT_PUSH_MIRROR;
834 struct helper_data *data = transport->data;
835 struct strbuf buf = STRBUF_INIT;
ae4efe19 836 struct ref *ref;
05c1eb10
JH
837 struct string_list cas_options = STRING_LIST_INIT_DUP;
838 struct string_list_item *cas_option;
ae4efe19 839
c0aa335c 840 get_helper(transport);
ae4efe19
SP
841 if (!data->push)
842 return 1;
843
844 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 845 if (!ref->peer_ref && !mirror)
ae4efe19
SP
846 continue;
847
20e8b465
TRC
848 /* Check for statuses set by set_ref_status_for_push() */
849 switch (ref->status) {
850 case REF_STATUS_REJECT_NONFASTFORWARD:
631b5ef2 851 case REF_STATUS_REJECT_STALE:
dbfeddb1 852 case REF_STATUS_REJECT_ALREADY_EXISTS:
20e8b465 853 case REF_STATUS_UPTODATE:
ae4efe19 854 continue;
20e8b465
TRC
855 default:
856 ; /* do nothing */
ae4efe19
SP
857 }
858
859 if (force_all)
860 ref->force = 1;
861
862 strbuf_addstr(&buf, "push ");
863 if (!ref->deletion) {
864 if (ref->force)
865 strbuf_addch(&buf, '+');
866 if (ref->peer_ref)
867 strbuf_addstr(&buf, ref->peer_ref->name);
868 else
f4e54d02 869 strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
ae4efe19
SP
870 }
871 strbuf_addch(&buf, ':');
872 strbuf_addstr(&buf, ref->name);
873 strbuf_addch(&buf, '\n');
05c1eb10
JH
874
875 /*
876 * The "--force-with-lease" options without explicit
877 * values to expect have already been expanded into
f4e54d02 878 * the ref->old_oid_expect[] field; we can ignore
05c1eb10
JH
879 * transport->smart_options->cas altogether and instead
880 * can enumerate them from the refs.
881 */
882 if (ref->expect_old_sha1) {
883 struct strbuf cas = STRBUF_INIT;
884 strbuf_addf(&cas, "%s:%s",
f4e54d02 885 ref->name, oid_to_hex(&ref->old_oid_expect));
176cb979
RS
886 string_list_append_nodup(&cas_options,
887 strbuf_detach(&cas, NULL));
05c1eb10 888 }
ae4efe19 889 }
05c1eb10
JH
890 if (buf.len == 0) {
891 string_list_clear(&cas_options, 0);
d8f67d20 892 return 0;
05c1eb10 893 }
ae4efe19 894
05c1eb10
JH
895 for_each_string_list_item(cas_option, &cas_options)
896 set_helper_option(transport, "cas", cas_option->string);
30261094 897 set_common_push_options(transport, data->name, flags);
ae4efe19
SP
898
899 strbuf_addch(&buf, '\n');
bf3c523c 900 sendline(data, &buf);
ae4efe19 901 strbuf_release(&buf);
176cb979 902 string_list_clear(&cas_options, 0);
d2e73c6f 903
0551a06c 904 return push_update_refs_status(data, remote_refs, flags);
ae4efe19
SP
905}
906
73b49a75
SR
907static int push_refs_with_export(struct transport *transport,
908 struct ref *remote_refs, int flags)
909{
910 struct ref *ref;
911 struct child_process *helper, exporter;
912 struct helper_data *data = transport->data;
d98c8153 913 struct string_list revlist_args = STRING_LIST_INIT_DUP;
73b49a75
SR
914 struct strbuf buf = STRBUF_INIT;
915
21610d82
FC
916 if (!data->refspecs)
917 die("remote-helper doesn't support push; refspec needed");
918
30261094 919 set_common_push_options(transport, data->name, flags);
510fa6f5
FC
920 if (flags & TRANSPORT_PUSH_FORCE) {
921 if (set_helper_option(transport, "force", "true") != 0)
922 warning("helper %s does not support 'force'", data->name);
923 }
924
73b49a75
SR
925 helper = get_helper(transport);
926
927 write_constant(helper->in, "export\n");
928
73b49a75
SR
929 for (ref = remote_refs; ref; ref = ref->next) {
930 char *private;
27912a03 931 struct object_id oid;
73b49a75 932
73b49a75 933 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
e82caf38 934 if (private && !get_oid(private, &oid)) {
73b49a75 935 strbuf_addf(&buf, "^%s", private);
176cb979
RS
936 string_list_append_nodup(&revlist_args,
937 strbuf_detach(&buf, NULL));
27912a03 938 oidcpy(&ref->old_oid, &oid);
73b49a75 939 }
2faa1527 940 free(private);
73b49a75 941
67c9c782 942 if (ref->peer_ref) {
d98c8153 943 if (strcmp(ref->name, ref->peer_ref->name)) {
f3d03763
FC
944 if (!ref->deletion) {
945 const char *name;
946 int flag;
947
948 /* Follow symbolic refs (mainly for HEAD). */
49e61479 949 name = resolve_ref_unsafe(ref->peer_ref->name,
950 RESOLVE_REF_READING,
951 &oid, &flag);
f3d03763
FC
952 if (!name || !(flag & REF_ISSYMREF))
953 name = ref->peer_ref->name;
9193f742 954
f3d03763
FC
955 strbuf_addf(&buf, "%s:%s", name, ref->name);
956 } else
957 strbuf_addf(&buf, ":%s", ref->name);
9193f742 958
d98c8153
FC
959 string_list_append(&revlist_args, "--refspec");
960 string_list_append(&revlist_args, buf.buf);
961 strbuf_release(&buf);
962 }
f3d03763
FC
963 if (!ref->deletion)
964 string_list_append(&revlist_args, ref->peer_ref->name);
67c9c782 965 }
73b49a75
SR
966 }
967
a515ebe9 968 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
969 die("Couldn't run fast-export");
970
d98c8153
FC
971 string_list_clear(&revlist_args, 1);
972
cc567322
SR
973 if (finish_command(&exporter))
974 die("Error while running fast-export");
3994e64d
FC
975 if (push_update_refs_status(data, remote_refs, flags))
976 return 1;
977
978 if (data->export_marks) {
979 strbuf_addf(&buf, "%s.tmp", data->export_marks);
980 rename(buf.buf, data->export_marks);
981 strbuf_release(&buf);
982 }
983
984 return 0;
73b49a75
SR
985}
986
987static int push_refs(struct transport *transport,
988 struct ref *remote_refs, int flags)
989{
990 struct helper_data *data = transport->data;
991
992 if (process_connect(transport, 1)) {
993 do_take_over(transport);
e967ca38 994 return transport->vtable->push_refs(transport, remote_refs, flags);
73b49a75
SR
995 }
996
997 if (!remote_refs) {
998 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
999 "Perhaps you should specify a branch such as 'master'.\n");
1000 return 0;
1001 }
1002
1003 if (data->push)
1004 return push_refs_with_push(transport, remote_refs, flags);
1005
1006 if (data->export)
1007 return push_refs_with_export(transport, remote_refs, flags);
1008
1009 return -1;
1010}
1011
1012
f8ec9167
DB
1013static int has_attribute(const char *attrs, const char *attr) {
1014 int len;
1015 if (!attrs)
1016 return 0;
1017
1018 len = strlen(attr);
1019 for (;;) {
1020 const char *space = strchrnul(attrs, ' ');
1021 if (len == space - attrs && !strncmp(attrs, attr, len))
1022 return 1;
1023 if (!*space)
1024 return 0;
1025 attrs = space + 1;
1026 }
1027}
1028
834cf34b
BW
1029static struct ref *get_refs_list(struct transport *transport, int for_push,
1030 const struct argv_array *ref_prefixes)
6eb996b5 1031{
292ce46b 1032 struct helper_data *data = transport->data;
6eb996b5
DB
1033 struct child_process *helper;
1034 struct ref *ret = NULL;
1035 struct ref **tail = &ret;
1036 struct ref *posn;
1037 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
1038
1039 helper = get_helper(transport);
2d14d65c 1040
fa8c097c
IL
1041 if (process_connect(transport, for_push)) {
1042 do_take_over(transport);
834cf34b 1043 return transport->vtable->get_refs_list(transport, for_push, ref_prefixes);
fa8c097c
IL
1044 }
1045
ae4efe19
SP
1046 if (data->push && for_push)
1047 write_str_in_full(helper->in, "list for-push\n");
1048 else
1049 write_str_in_full(helper->in, "list\n");
6eb996b5 1050
6eb996b5
DB
1051 while (1) {
1052 char *eov, *eon;
5931b33e
FC
1053 if (recvline(data, &buf))
1054 exit(128);
6eb996b5
DB
1055
1056 if (!*buf.buf)
1057 break;
1058
1059 eov = strchr(buf.buf, ' ');
1060 if (!eov)
1061 die("Malformed response in ref list: %s", buf.buf);
1062 eon = strchr(eov + 1, ' ');
1063 *eov = '\0';
1064 if (eon)
1065 *eon = '\0';
1066 *tail = alloc_ref(eov + 1);
1067 if (buf.buf[0] == '@')
1068 (*tail)->symref = xstrdup(buf.buf + 1);
1069 else if (buf.buf[0] != '?')
f4e54d02 1070 get_oid_hex(buf.buf, &(*tail)->old_oid);
f8ec9167
DB
1071 if (eon) {
1072 if (has_attribute(eon + 1, "unchanged")) {
1073 (*tail)->status |= REF_STATUS_UPTODATE;
34c290a6 1074 if (read_ref((*tail)->name, &(*tail)->old_oid) < 0)
3c5077fe 1075 die(_("Could not read ref %s"),
ae25fd39 1076 (*tail)->name);
f8ec9167
DB
1077 }
1078 }
6eb996b5
DB
1079 tail = &((*tail)->next);
1080 }
bf3c523c
IL
1081 if (debug)
1082 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
1083 strbuf_release(&buf);
1084
1085 for (posn = ret; posn; posn = posn->next)
1086 resolve_remote_symref(posn, ret);
1087
1088 return ret;
1089}
1090
e967ca38
JT
1091static struct transport_vtable vtable = {
1092 set_helper_option,
1093 get_refs_list,
1094 fetch,
1095 push_refs,
1096 connect_helper,
1097 release_helper
1098};
1099
c9e388bb 1100int transport_helper_init(struct transport *transport, const char *name)
6eb996b5 1101{
92e25b6b 1102 struct helper_data *data = xcalloc(1, sizeof(*data));
c9e388bb 1103 data->name = name;
6eb996b5 1104
a5adaced
JK
1105 transport_check_allowed(name);
1106
bf3c523c
IL
1107 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1108 debug = 1;
1109
6eb996b5 1110 transport->data = data;
e967ca38 1111 transport->vtable = &vtable;
61b075bd 1112 transport->smart_options = &(data->transport_options);
6eb996b5
DB
1113 return 0;
1114}
419f37db
IL
1115
1116/*
1117 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1118 * buffer less), so attempt reads and writes with up to that size.
1119 */
1120#define BUFFERSIZE 65536
1121/* This should be enough to hold debugging message. */
1122#define PBUFFERSIZE 8192
1123
1124/* Print bidirectional transfer loop debug message. */
4621085b 1125__attribute__((format (printf, 1, 2)))
419f37db
IL
1126static void transfer_debug(const char *fmt, ...)
1127{
6cdf8a79
1128 /*
1129 * NEEDSWORK: This function is sometimes used from multiple threads, and
1130 * we end up using debug_enabled racily. That "should not matter" since
1131 * we always write the same value, but it's still wrong. This function
1132 * is listed in .tsan-suppressions for the time being.
1133 */
1134
419f37db
IL
1135 va_list args;
1136 char msgbuf[PBUFFERSIZE];
1137 static int debug_enabled = -1;
1138
1139 if (debug_enabled < 0)
1140 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1141 if (!debug_enabled)
1142 return;
1143
1144 va_start(args, fmt);
1145 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1146 va_end(args);
1147 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1148}
1149
1150/* Stream state: More data may be coming in this direction. */
2e3a16b2 1151#define SSTATE_TRANSFERRING 0
419f37db
IL
1152/*
1153 * Stream state: No more data coming in this direction, flushing rest of
1154 * data.
1155 */
1156#define SSTATE_FLUSHING 1
1157/* Stream state: Transfer in this direction finished. */
1158#define SSTATE_FINISHED 2
1159
2e3a16b2 1160#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
419f37db
IL
1161#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1162#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1163
1164/* Unidirectional transfer. */
1165struct unidirectional_transfer {
1166 /* Source */
1167 int src;
1168 /* Destination */
1169 int dest;
1170 /* Is source socket? */
1171 int src_is_sock;
1172 /* Is destination socket? */
1173 int dest_is_sock;
41ccfdd9 1174 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
419f37db
IL
1175 int state;
1176 /* Buffer. */
1177 char buf[BUFFERSIZE];
1178 /* Buffer used. */
1179 size_t bufuse;
1180 /* Name of source. */
1181 const char *src_name;
1182 /* Name of destination. */
1183 const char *dest_name;
1184};
1185
1186/* Closes the target (for writing) if transfer has finished. */
1187static void udt_close_if_finished(struct unidirectional_transfer *t)
1188{
1189 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1190 t->state = SSTATE_FINISHED;
1191 if (t->dest_is_sock)
1192 shutdown(t->dest, SHUT_WR);
1193 else
1194 close(t->dest);
1195 transfer_debug("Closed %s.", t->dest_name);
1196 }
1197}
1198
1199/*
832c0e5e 1200 * Tries to read data from source into buffer. If buffer is full,
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1201 * no data is read. Returns 0 on success, -1 on error.
1202 */
1203static int udt_do_read(struct unidirectional_transfer *t)
1204{
1205 ssize_t bytes;
1206
1207 if (t->bufuse == BUFFERSIZE)
1208 return 0; /* No space for more. */
1209
1210 transfer_debug("%s is readable", t->src_name);
1211 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1212 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1213 errno != EINTR) {
1fee1dce 1214 error_errno("read(%s) failed", t->src_name);
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1215 return -1;
1216 } else if (bytes == 0) {
1217 transfer_debug("%s EOF (with %i bytes in buffer)",
4621085b 1218 t->src_name, (int)t->bufuse);
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1219 t->state = SSTATE_FLUSHING;
1220 } else if (bytes > 0) {
1221 t->bufuse += bytes;
1222 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1223 (int)bytes, t->src_name, (int)t->bufuse);
1224 }
1225 return 0;
1226}
1227
1228/* Tries to write data from buffer into destination. If buffer is empty,
1229 * no data is written. Returns 0 on success, -1 on error.
1230 */
1231static int udt_do_write(struct unidirectional_transfer *t)
1232{
803dbdb9 1233 ssize_t bytes;
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1234
1235 if (t->bufuse == 0)
1236 return 0; /* Nothing to write. */
1237
1238 transfer_debug("%s is writable", t->dest_name);
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1239 bytes = xwrite(t->dest, t->buf, t->bufuse);
1240 if (bytes < 0 && errno != EWOULDBLOCK) {
1fee1dce 1241 error_errno("write(%s) failed", t->dest_name);
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1242 return -1;
1243 } else if (bytes > 0) {
1244 t->bufuse -= bytes;
1245 if (t->bufuse)
1246 memmove(t->buf, t->buf + bytes, t->bufuse);
1247 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1248 (int)bytes, t->dest_name, (int)t->bufuse);
1249 }
1250 return 0;
1251}
1252
1253
1254/* State of bidirectional transfer loop. */
1255struct bidirectional_transfer_state {
1256 /* Direction from program to git. */
1257 struct unidirectional_transfer ptg;
1258 /* Direction from git to program. */
1259 struct unidirectional_transfer gtp;
1260};
1261
1262static void *udt_copy_task_routine(void *udt)
1263{
1264 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1265 while (t->state != SSTATE_FINISHED) {
1266 if (STATE_NEEDS_READING(t->state))
1267 if (udt_do_read(t))
1268 return NULL;
1269 if (STATE_NEEDS_WRITING(t->state))
1270 if (udt_do_write(t))
1271 return NULL;
1272 if (STATE_NEEDS_CLOSING(t->state))
1273 udt_close_if_finished(t);
1274 }
1275 return udt; /* Just some non-NULL value. */
1276}
1277
1278#ifndef NO_PTHREADS
1279
1280/*
98e023de 1281 * Join thread, with appropriate errors on failure. Name is name for the
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1282 * thread (for error messages). Returns 0 on success, 1 on failure.
1283 */
1284static int tloop_join(pthread_t thread, const char *name)
1285{
1286 int err;
1287 void *tret;
1288 err = pthread_join(thread, &tret);
1289 if (!tret) {
1290 error("%s thread failed", name);
1291 return 1;
1292 }
1293 if (err) {
1294 error("%s thread failed to join: %s", name, strerror(err));
1295 return 1;
1296 }
1297 return 0;
1298}
1299
1300/*
1301 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1302 * -1 on failure.
1303 */
1304static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1305{
1306 pthread_t gtp_thread;
1307 pthread_t ptg_thread;
1308 int err;
1309 int ret = 0;
1310 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1311 &s->gtp);
1312 if (err)
1313 die("Can't start thread for copying data: %s", strerror(err));
1314 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1315 &s->ptg);
1316 if (err)
1317 die("Can't start thread for copying data: %s", strerror(err));
1318
1319 ret |= tloop_join(gtp_thread, "Git to program copy");
1320 ret |= tloop_join(ptg_thread, "Program to git copy");
1321 return ret;
1322}
1323#else
1324
1325/* Close the source and target (for writing) for transfer. */
1326static void udt_kill_transfer(struct unidirectional_transfer *t)
1327{
1328 t->state = SSTATE_FINISHED;
1329 /*
1330 * Socket read end left open isn't a disaster if nobody
1331 * attempts to read from it (mingw compat headers do not
1332 * have SHUT_RD)...
1333 *
1334 * We can't fully close the socket since otherwise gtp
1335 * task would first close the socket it sends data to
1336 * while closing the ptg file descriptors.
1337 */
1338 if (!t->src_is_sock)
1339 close(t->src);
1340 if (t->dest_is_sock)
1341 shutdown(t->dest, SHUT_WR);
1342 else
1343 close(t->dest);
1344}
1345
1346/*
98e023de 1347 * Join process, with appropriate errors on failure. Name is name for the
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1348 * process (for error messages). Returns 0 on success, 1 on failure.
1349 */
1350static int tloop_join(pid_t pid, const char *name)
1351{
1352 int tret;
1353 if (waitpid(pid, &tret, 0) < 0) {
1fee1dce 1354 error_errno("%s process failed to wait", name);
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1355 return 1;
1356 }
1357 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1358 error("%s process failed", name);
1359 return 1;
1360 }
1361 return 0;
1362}
1363
1364/*
1365 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1366 * -1 on failure.
1367 */
1368static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1369{
1370 pid_t pid1, pid2;
1371 int ret = 0;
1372
1373 /* Fork thread #1: git to program. */
1374 pid1 = fork();
1375 if (pid1 < 0)
1376 die_errno("Can't start thread for copying data");
1377 else if (pid1 == 0) {
1378 udt_kill_transfer(&s->ptg);
1379 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1380 }
1381
1382 /* Fork thread #2: program to git. */
1383 pid2 = fork();
1384 if (pid2 < 0)
1385 die_errno("Can't start thread for copying data");
1386 else if (pid2 == 0) {
1387 udt_kill_transfer(&s->gtp);
1388 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1389 }
1390
1391 /*
1392 * Close both streams in parent as to not interfere with
1393 * end of file detection and wait for both tasks to finish.
1394 */
1395 udt_kill_transfer(&s->gtp);
1396 udt_kill_transfer(&s->ptg);
1397 ret |= tloop_join(pid1, "Git to program copy");
1398 ret |= tloop_join(pid2, "Program to git copy");
1399 return ret;
1400}
1401#endif
1402
1403/*
1404 * Copies data from stdin to output and from input to stdout simultaneously.
1405 * Additionally filtering through given filter. If filter is NULL, uses
1406 * identity filter.
1407 */
1408int bidirectional_transfer_loop(int input, int output)
1409{
1410 struct bidirectional_transfer_state state;
1411
1412 /* Fill the state fields. */
1413 state.ptg.src = input;
1414 state.ptg.dest = 1;
1415 state.ptg.src_is_sock = (input == output);
1416 state.ptg.dest_is_sock = 0;
2e3a16b2 1417 state.ptg.state = SSTATE_TRANSFERRING;
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1418 state.ptg.bufuse = 0;
1419 state.ptg.src_name = "remote input";
1420 state.ptg.dest_name = "stdout";
1421
1422 state.gtp.src = 0;
1423 state.gtp.dest = output;
1424 state.gtp.src_is_sock = 0;
1425 state.gtp.dest_is_sock = (input == output);
2e3a16b2 1426 state.gtp.state = SSTATE_TRANSFERRING;
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1427 state.gtp.bufuse = 0;
1428 state.gtp.src_name = "stdin";
1429 state.gtp.dest_name = "remote output";
1430
1431 return tloop_spawnwait_tasks(&state);
1432}