resolve_ref(): do not follow incorrectly-formatted symbolic refs
[git/git.git] / transport-helper.c
CommitLineData
6eb996b5
DB
1#include "cache.h"
2#include "transport.h"
ae4efe19 3#include "quote.h"
6eb996b5
DB
4#include "run-command.h"
5#include "commit.h"
6#include "diff.h"
7#include "revision.h"
ef08ef9e 8#include "quote.h"
72ff8943 9#include "remote.h"
73b49a75 10#include "string-list.h"
7851b1e6 11#include "thread-utils.h"
7851b1e6 12
bf3c523c
IL
13static int debug;
14
9cba13ca 15struct helper_data {
6eb996b5
DB
16 const char *name;
17 struct child_process *helper;
292ce46b 18 FILE *out;
ef08ef9e 19 unsigned fetch : 1,
a24a32dd 20 import : 1,
73b49a75 21 export : 1,
ae4efe19 22 option : 1,
fa8c097c
IL
23 push : 1,
24 connect : 1,
25 no_disconnect_req : 1;
a515ebe9
SR
26 char *export_marks;
27 char *import_marks;
72ff8943
DB
28 /* These go from remote name (as in "list") to private name */
29 struct refspec *refspecs;
30 int refspec_nr;
61b075bd
IL
31 /* Transport options for fetch-pack/send-pack (should one of
32 * those be invoked).
33 */
34 struct git_transport_options transport_options;
6eb996b5
DB
35};
36
bf3c523c
IL
37static void sendline(struct helper_data *helper, struct strbuf *buffer)
38{
39 if (debug)
40 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
41 if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
42 != buffer->len)
43 die_errno("Full write to remote helper failed");
44}
45
fa8c097c 46static int recvline_fh(FILE *helper, struct strbuf *buffer)
bf3c523c
IL
47{
48 strbuf_reset(buffer);
49 if (debug)
50 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
fa8c097c 51 if (strbuf_getline(buffer, helper, '\n') == EOF) {
bf3c523c
IL
52 if (debug)
53 fprintf(stderr, "Debug: Remote helper quit.\n");
54 exit(128);
55 }
56
57 if (debug)
58 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
59 return 0;
60}
61
fa8c097c
IL
62static int recvline(struct helper_data *helper, struct strbuf *buffer)
63{
64 return recvline_fh(helper->out, buffer);
65}
66
bf3c523c
IL
67static void xchgline(struct helper_data *helper, struct strbuf *buffer)
68{
69 sendline(helper, buffer);
70 recvline(helper, buffer);
71}
72
73static void write_constant(int fd, const char *str)
74{
75 if (debug)
76 fprintf(stderr, "Debug: Remote helper: -> %s", str);
77 if (write_in_full(fd, str, strlen(str)) != strlen(str))
78 die_errno("Full write to remote helper failed");
79}
80
c2e86add 81static const char *remove_ext_force(const char *url)
25d5cc48
IL
82{
83 if (url) {
84 const char *colon = strchr(url, ':');
85 if (colon && colon[1] == ':')
86 return colon + 2;
87 }
88 return url;
89}
90
fa8c097c
IL
91static void do_take_over(struct transport *transport)
92{
93 struct helper_data *data;
94 data = (struct helper_data *)transport->data;
95 transport_take_over(transport, data->helper);
96 fclose(data->out);
97 free(data);
98}
99
6eb996b5
DB
100static struct child_process *get_helper(struct transport *transport)
101{
102 struct helper_data *data = transport->data;
103 struct strbuf buf = STRBUF_INIT;
104 struct child_process *helper;
72ff8943
DB
105 const char **refspecs = NULL;
106 int refspec_nr = 0;
107 int refspec_alloc = 0;
61b075bd 108 int duped;
6b02de3b 109 int code;
e1735872
DI
110 char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
111 const char *helper_env[] = {
112 git_dir_buf,
113 NULL
114 };
115
6eb996b5
DB
116
117 if (data->helper)
118 return data->helper;
119
120 helper = xcalloc(1, sizeof(*helper));
121 helper->in = -1;
122 helper->out = -1;
123 helper->err = 0;
124 helper->argv = xcalloc(4, sizeof(*helper->argv));
6b02de3b 125 strbuf_addf(&buf, "git-remote-%s", data->name);
6eb996b5
DB
126 helper->argv[0] = strbuf_detach(&buf, NULL);
127 helper->argv[1] = transport->remote->name;
25d5cc48 128 helper->argv[2] = remove_ext_force(transport->url);
6b02de3b
IL
129 helper->git_cmd = 0;
130 helper->silent_exec_failure = 1;
e1735872
DI
131
132 snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
133 helper->env = helper_env;
134
6b02de3b
IL
135 code = start_command(helper);
136 if (code < 0 && errno == ENOENT)
137 die("Unable to find remote helper for '%s'", data->name);
138 else if (code != 0)
139 exit(code);
140
6eb996b5 141 data->helper = helper;
fa8c097c 142 data->no_disconnect_req = 0;
6eb996b5 143
61b075bd
IL
144 /*
145 * Open the output as FILE* so strbuf_getline() can be used.
146 * Do this with duped fd because fclose() will close the fd,
147 * and stuff like taking over will require the fd to remain.
61b075bd
IL
148 */
149 duped = dup(helper->out);
150 if (duped < 0)
151 die_errno("Can't dup helper output fd");
152 data->out = xfdopen(duped, "r");
153
bf3c523c 154 write_constant(helper->in, "capabilities\n");
2d14d65c 155
6eb996b5 156 while (1) {
28ed5b35
IL
157 const char *capname;
158 int mandatory = 0;
bf3c523c 159 recvline(data, &buf);
6eb996b5
DB
160
161 if (!*buf.buf)
162 break;
28ed5b35
IL
163
164 if (*buf.buf == '*') {
165 capname = buf.buf + 1;
166 mandatory = 1;
167 } else
168 capname = buf.buf;
169
bf3c523c 170 if (debug)
28ed5b35
IL
171 fprintf(stderr, "Debug: Got cap %s\n", capname);
172 if (!strcmp(capname, "fetch"))
6eb996b5 173 data->fetch = 1;
28ed5b35 174 else if (!strcmp(capname, "option"))
ef08ef9e 175 data->option = 1;
28ed5b35 176 else if (!strcmp(capname, "push"))
ae4efe19 177 data->push = 1;
28ed5b35 178 else if (!strcmp(capname, "import"))
e65e91ed 179 data->import = 1;
73b49a75
SR
180 else if (!strcmp(capname, "export"))
181 data->export = 1;
28ed5b35 182 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
72ff8943
DB
183 ALLOC_GROW(refspecs,
184 refspec_nr + 1,
185 refspec_alloc);
4d2ec306 186 refspecs[refspec_nr++] = strdup(capname + strlen("refspec "));
fa8c097c
IL
187 } else if (!strcmp(capname, "connect")) {
188 data->connect = 1;
a515ebe9
SR
189 } else if (!prefixcmp(capname, "export-marks ")) {
190 struct strbuf arg = STRBUF_INIT;
191 strbuf_addstr(&arg, "--export-marks=");
192 strbuf_addstr(&arg, capname + strlen("export-marks "));
193 data->export_marks = strbuf_detach(&arg, NULL);
194 } else if (!prefixcmp(capname, "import-marks")) {
195 struct strbuf arg = STRBUF_INIT;
196 strbuf_addstr(&arg, "--import-marks=");
197 strbuf_addstr(&arg, capname + strlen("import-marks "));
198 data->import_marks = strbuf_detach(&arg, NULL);
28ed5b35 199 } else if (mandatory) {
9517e6b8 200 die("Unknown mandatory capability %s. This remote "
28ed5b35
IL
201 "helper probably needs newer version of Git.\n",
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);
209 for (i = 0; i < refspec_nr; i++) {
210 free((char *)refspecs[i]);
211 }
212 free(refspecs);
6eb996b5 213 }
b962dbdc 214 strbuf_release(&buf);
bf3c523c
IL
215 if (debug)
216 fprintf(stderr, "Debug: Capabilities complete.\n");
6eb996b5
DB
217 return data->helper;
218}
219
220static int disconnect_helper(struct transport *transport)
221{
222 struct helper_data *data = transport->data;
bf3c523c 223 struct strbuf buf = STRBUF_INIT;
cc567322 224 int res = 0;
bf3c523c 225
6eb996b5 226 if (data->helper) {
bf3c523c
IL
227 if (debug)
228 fprintf(stderr, "Debug: Disconnecting.\n");
fa8c097c
IL
229 if (!data->no_disconnect_req) {
230 strbuf_addf(&buf, "\n");
231 sendline(data, &buf);
232 }
6eb996b5 233 close(data->helper->in);
61b075bd 234 close(data->helper->out);
292ce46b 235 fclose(data->out);
cc567322 236 res = finish_command(data->helper);
6eb996b5
DB
237 free((char *)data->helper->argv[0]);
238 free(data->helper->argv);
239 free(data->helper);
240 data->helper = NULL;
241 }
cc567322 242 return res;
6eb996b5
DB
243}
244
ef08ef9e
SP
245static const char *unsupported_options[] = {
246 TRANS_OPT_UPLOADPACK,
247 TRANS_OPT_RECEIVEPACK,
248 TRANS_OPT_THIN,
249 TRANS_OPT_KEEP
250 };
251static const char *boolean_options[] = {
252 TRANS_OPT_THIN,
253 TRANS_OPT_KEEP,
254 TRANS_OPT_FOLLOWTAGS
255 };
256
257static int set_helper_option(struct transport *transport,
258 const char *name, const char *value)
259{
260 struct helper_data *data = transport->data;
ef08ef9e
SP
261 struct strbuf buf = STRBUF_INIT;
262 int i, ret, is_bool = 0;
263
bf3c523c
IL
264 get_helper(transport);
265
ef08ef9e
SP
266 if (!data->option)
267 return 1;
268
269 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
270 if (!strcmp(name, unsupported_options[i]))
271 return 1;
272 }
273
274 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
275 if (!strcmp(name, boolean_options[i])) {
276 is_bool = 1;
277 break;
278 }
279 }
280
281 strbuf_addf(&buf, "option %s ", name);
282 if (is_bool)
283 strbuf_addstr(&buf, value ? "true" : "false");
284 else
285 quote_c_style(value, &buf, NULL, 0);
286 strbuf_addch(&buf, '\n');
287
bf3c523c 288 xchgline(data, &buf);
ef08ef9e
SP
289
290 if (!strcmp(buf.buf, "ok"))
291 ret = 0;
292 else if (!prefixcmp(buf.buf, "error")) {
293 ret = -1;
294 } else if (!strcmp(buf.buf, "unsupported"))
295 ret = 1;
296 else {
297 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
298 ret = 1;
299 }
300 strbuf_release(&buf);
301 return ret;
302}
303
304static void standard_options(struct transport *t)
305{
306 char buf[16];
307 int n;
308 int v = t->verbose;
ef08ef9e 309
d01b3c02 310 set_helper_option(t, "progress", t->progress ? "true" : "false");
ef08ef9e
SP
311
312 n = snprintf(buf, sizeof(buf), "%d", v + 1);
313 if (n >= sizeof(buf))
314 die("impossibly large verbosity value");
315 set_helper_option(t, "verbosity", buf);
316}
317
f2a37151
DB
318static int release_helper(struct transport *transport)
319{
cc567322 320 int res = 0;
72ff8943
DB
321 struct helper_data *data = transport->data;
322 free_refspec(data->refspec_nr, data->refspecs);
323 data->refspecs = NULL;
cc567322 324 res = disconnect_helper(transport);
f2a37151 325 free(transport->data);
cc567322 326 return res;
f2a37151
DB
327}
328
6eb996b5 329static int fetch_with_fetch(struct transport *transport,
37148311 330 int nr_heads, struct ref **to_fetch)
6eb996b5 331{
292ce46b 332 struct helper_data *data = transport->data;
6eb996b5
DB
333 int i;
334 struct strbuf buf = STRBUF_INIT;
335
ef08ef9e
SP
336 standard_options(transport);
337
6eb996b5 338 for (i = 0; i < nr_heads; i++) {
1088261f 339 const struct ref *posn = to_fetch[i];
6eb996b5
DB
340 if (posn->status & REF_STATUS_UPTODATE)
341 continue;
2d14d65c
DB
342
343 strbuf_addf(&buf, "fetch %s %s\n",
344 sha1_to_hex(posn->old_sha1), posn->name);
292ce46b 345 }
2d14d65c 346
292ce46b 347 strbuf_addch(&buf, '\n');
bf3c523c 348 sendline(data, &buf);
292ce46b
SP
349
350 while (1) {
bf3c523c 351 recvline(data, &buf);
292ce46b
SP
352
353 if (!prefixcmp(buf.buf, "lock ")) {
354 const char *name = buf.buf + 5;
355 if (transport->pack_lockfile)
356 warning("%s also locked %s", data->name, name);
357 else
358 transport->pack_lockfile = xstrdup(name);
359 }
360 else if (!buf.len)
361 break;
362 else
363 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5 364 }
292ce46b 365 strbuf_release(&buf);
6eb996b5
DB
366 return 0;
367}
368
e65e91ed
DB
369static int get_importer(struct transport *transport, struct child_process *fastimport)
370{
371 struct child_process *helper = get_helper(transport);
372 memset(fastimport, 0, sizeof(*fastimport));
373 fastimport->in = helper->out;
374 fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
375 fastimport->argv[0] = "fast-import";
376 fastimport->argv[1] = "--quiet";
377
378 fastimport->git_cmd = 1;
379 return start_command(fastimport);
380}
381
73b49a75
SR
382static int get_exporter(struct transport *transport,
383 struct child_process *fastexport,
73b49a75
SR
384 struct string_list *revlist_args)
385{
a515ebe9 386 struct helper_data *data = transport->data;
73b49a75
SR
387 struct child_process *helper = get_helper(transport);
388 int argc = 0, i;
389 memset(fastexport, 0, sizeof(*fastexport));
390
391 /* we need to duplicate helper->in because we want to use it after
392 * fastexport is done with it. */
393 fastexport->out = dup(helper->in);
1f25c504 394 fastexport->argv = xcalloc(5 + revlist_args->nr, sizeof(*fastexport->argv));
73b49a75 395 fastexport->argv[argc++] = "fast-export";
1f25c504 396 fastexport->argv[argc++] = "--use-done-feature";
a515ebe9
SR
397 if (data->export_marks)
398 fastexport->argv[argc++] = data->export_marks;
399 if (data->import_marks)
400 fastexport->argv[argc++] = data->import_marks;
73b49a75
SR
401
402 for (i = 0; i < revlist_args->nr; i++)
403 fastexport->argv[argc++] = revlist_args->items[i].string;
404
405 fastexport->git_cmd = 1;
406 return start_command(fastexport);
407}
408
e65e91ed
DB
409static int fetch_with_import(struct transport *transport,
410 int nr_heads, struct ref **to_fetch)
411{
412 struct child_process fastimport;
72ff8943 413 struct helper_data *data = transport->data;
e65e91ed
DB
414 int i;
415 struct ref *posn;
416 struct strbuf buf = STRBUF_INIT;
417
bf3c523c
IL
418 get_helper(transport);
419
e65e91ed
DB
420 if (get_importer(transport, &fastimport))
421 die("Couldn't run fast-import");
422
423 for (i = 0; i < nr_heads; i++) {
424 posn = to_fetch[i];
425 if (posn->status & REF_STATUS_UPTODATE)
426 continue;
427
428 strbuf_addf(&buf, "import %s\n", posn->name);
bf3c523c 429 sendline(data, &buf);
e65e91ed
DB
430 strbuf_reset(&buf);
431 }
9504bc9d
SR
432
433 write_constant(data->helper->in, "\n");
434
cc567322
SR
435 if (finish_command(&fastimport))
436 die("Error while running fast-import");
b962dbdc
SR
437 free(fastimport.argv);
438 fastimport.argv = NULL;
e65e91ed
DB
439
440 for (i = 0; i < nr_heads; i++) {
72ff8943 441 char *private;
e65e91ed
DB
442 posn = to_fetch[i];
443 if (posn->status & REF_STATUS_UPTODATE)
444 continue;
72ff8943
DB
445 if (data->refspecs)
446 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
447 else
448 private = strdup(posn->name);
449 read_ref(private, posn->old_sha1);
450 free(private);
e65e91ed 451 }
b962dbdc 452 strbuf_release(&buf);
e65e91ed
DB
453 return 0;
454}
455
fa8c097c
IL
456static int process_connect_service(struct transport *transport,
457 const char *name, const char *exec)
458{
459 struct helper_data *data = transport->data;
460 struct strbuf cmdbuf = STRBUF_INIT;
461 struct child_process *helper;
462 int r, duped, ret = 0;
463 FILE *input;
464
465 helper = get_helper(transport);
466
467 /*
468 * Yes, dup the pipe another time, as we need unbuffered version
469 * of input pipe as FILE*. fclose() closes the underlying fd and
470 * stream buffering only can be changed before first I/O operation
471 * on it.
472 */
473 duped = dup(helper->out);
474 if (duped < 0)
475 die_errno("Can't dup helper output fd");
476 input = xfdopen(duped, "r");
477 setvbuf(input, NULL, _IONBF, 0);
478
479 /*
480 * Handle --upload-pack and friends. This is fire and forget...
481 * just warn if it fails.
482 */
483 if (strcmp(name, exec)) {
484 r = set_helper_option(transport, "servpath", exec);
485 if (r > 0)
486 warning("Setting remote service path not supported by protocol.");
487 else if (r < 0)
488 warning("Invalid remote service path.");
489 }
490
491 if (data->connect)
492 strbuf_addf(&cmdbuf, "connect %s\n", name);
493 else
494 goto exit;
495
496 sendline(data, &cmdbuf);
497 recvline_fh(input, &cmdbuf);
498 if (!strcmp(cmdbuf.buf, "")) {
499 data->no_disconnect_req = 1;
500 if (debug)
501 fprintf(stderr, "Debug: Smart transport connection "
502 "ready.\n");
503 ret = 1;
504 } else if (!strcmp(cmdbuf.buf, "fallback")) {
505 if (debug)
506 fprintf(stderr, "Debug: Falling back to dumb "
507 "transport.\n");
508 } else
509 die("Unknown response to connect: %s",
510 cmdbuf.buf);
511
512exit:
513 fclose(input);
514 return ret;
515}
516
517static int process_connect(struct transport *transport,
518 int for_push)
519{
520 struct helper_data *data = transport->data;
521 const char *name;
522 const char *exec;
523
524 name = for_push ? "git-receive-pack" : "git-upload-pack";
525 if (for_push)
526 exec = data->transport_options.receivepack;
527 else
528 exec = data->transport_options.uploadpack;
529
530 return process_connect_service(transport, name, exec);
531}
532
b236752a
IL
533static int connect_helper(struct transport *transport, const char *name,
534 const char *exec, int fd[2])
535{
536 struct helper_data *data = transport->data;
537
538 /* Get_helper so connect is inited. */
539 get_helper(transport);
540 if (!data->connect)
541 die("Operation not supported by protocol.");
542
543 if (!process_connect_service(transport, name, exec))
544 die("Can't connect to subservice %s.", name);
545
546 fd[0] = data->helper->out;
547 fd[1] = data->helper->in;
548 return 0;
549}
550
6eb996b5 551static int fetch(struct transport *transport,
37148311 552 int nr_heads, struct ref **to_fetch)
6eb996b5
DB
553{
554 struct helper_data *data = transport->data;
555 int i, count;
556
fa8c097c
IL
557 if (process_connect(transport, 0)) {
558 do_take_over(transport);
559 return transport->fetch(transport, nr_heads, to_fetch);
560 }
561
6eb996b5
DB
562 count = 0;
563 for (i = 0; i < nr_heads; i++)
564 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
565 count++;
566
567 if (!count)
568 return 0;
569
570 if (data->fetch)
571 return fetch_with_fetch(transport, nr_heads, to_fetch);
572
e65e91ed
DB
573 if (data->import)
574 return fetch_with_import(transport, nr_heads, to_fetch);
575
6eb996b5
DB
576 return -1;
577}
578
d2e73c6f
SR
579static void push_update_ref_status(struct strbuf *buf,
580 struct ref **ref,
581 struct ref *remote_refs)
582{
583 char *refname, *msg;
584 int status;
585
586 if (!prefixcmp(buf->buf, "ok ")) {
587 status = REF_STATUS_OK;
588 refname = buf->buf + 3;
589 } else if (!prefixcmp(buf->buf, "error ")) {
590 status = REF_STATUS_REMOTE_REJECT;
591 refname = buf->buf + 6;
592 } else
593 die("expected ok/error, helper said '%s'\n", buf->buf);
594
595 msg = strchr(refname, ' ');
596 if (msg) {
597 struct strbuf msg_buf = STRBUF_INIT;
598 const char *end;
599
600 *msg++ = '\0';
601 if (!unquote_c_style(&msg_buf, msg, &end))
602 msg = strbuf_detach(&msg_buf, NULL);
603 else
604 msg = xstrdup(msg);
605 strbuf_release(&msg_buf);
606
607 if (!strcmp(msg, "no match")) {
608 status = REF_STATUS_NONE;
609 free(msg);
610 msg = NULL;
611 }
612 else if (!strcmp(msg, "up to date")) {
613 status = REF_STATUS_UPTODATE;
614 free(msg);
615 msg = NULL;
616 }
617 else if (!strcmp(msg, "non-fast forward")) {
618 status = REF_STATUS_REJECT_NONFASTFORWARD;
619 free(msg);
620 msg = NULL;
621 }
622 }
623
624 if (*ref)
625 *ref = find_ref_by_name(*ref, refname);
626 if (!*ref)
627 *ref = find_ref_by_name(remote_refs, refname);
628 if (!*ref) {
629 warning("helper reported unexpected status of %s", refname);
630 return;
631 }
632
633 if ((*ref)->status != REF_STATUS_NONE) {
634 /*
635 * Earlier, the ref was marked not to be pushed, so ignore the ref
636 * status reported by the remote helper if the latter is 'no match'.
637 */
638 if (status == REF_STATUS_NONE)
639 return;
640 }
641
642 (*ref)->status = status;
643 (*ref)->remote_status = msg;
644}
645
646static void push_update_refs_status(struct helper_data *data,
647 struct ref *remote_refs)
648{
649 struct strbuf buf = STRBUF_INIT;
650 struct ref *ref = remote_refs;
651 for (;;) {
652 recvline(data, &buf);
653 if (!buf.len)
654 break;
655
656 push_update_ref_status(&buf, &ref, remote_refs);
657 }
658 strbuf_release(&buf);
659}
660
73b49a75 661static int push_refs_with_push(struct transport *transport,
ae4efe19
SP
662 struct ref *remote_refs, int flags)
663{
664 int force_all = flags & TRANSPORT_PUSH_FORCE;
665 int mirror = flags & TRANSPORT_PUSH_MIRROR;
666 struct helper_data *data = transport->data;
667 struct strbuf buf = STRBUF_INIT;
ae4efe19
SP
668 struct ref *ref;
669
c0aa335c 670 get_helper(transport);
ae4efe19
SP
671 if (!data->push)
672 return 1;
673
674 for (ref = remote_refs; ref; ref = ref->next) {
20e8b465 675 if (!ref->peer_ref && !mirror)
ae4efe19
SP
676 continue;
677
20e8b465
TRC
678 /* Check for statuses set by set_ref_status_for_push() */
679 switch (ref->status) {
680 case REF_STATUS_REJECT_NONFASTFORWARD:
681 case REF_STATUS_UPTODATE:
ae4efe19 682 continue;
20e8b465
TRC
683 default:
684 ; /* do nothing */
ae4efe19
SP
685 }
686
687 if (force_all)
688 ref->force = 1;
689
690 strbuf_addstr(&buf, "push ");
691 if (!ref->deletion) {
692 if (ref->force)
693 strbuf_addch(&buf, '+');
694 if (ref->peer_ref)
695 strbuf_addstr(&buf, ref->peer_ref->name);
696 else
697 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
698 }
699 strbuf_addch(&buf, ':');
700 strbuf_addstr(&buf, ref->name);
701 strbuf_addch(&buf, '\n');
702 }
d8f67d20
CB
703 if (buf.len == 0)
704 return 0;
ae4efe19 705
ae4efe19
SP
706 standard_options(transport);
707
708 if (flags & TRANSPORT_PUSH_DRY_RUN) {
709 if (set_helper_option(transport, "dry-run", "true") != 0)
710 die("helper %s does not support dry-run", data->name);
711 }
712
713 strbuf_addch(&buf, '\n');
bf3c523c 714 sendline(data, &buf);
ae4efe19 715 strbuf_release(&buf);
d2e73c6f
SR
716
717 push_update_refs_status(data, remote_refs);
ae4efe19
SP
718 return 0;
719}
720
73b49a75
SR
721static int push_refs_with_export(struct transport *transport,
722 struct ref *remote_refs, int flags)
723{
724 struct ref *ref;
725 struct child_process *helper, exporter;
726 struct helper_data *data = transport->data;
183113a5 727 struct string_list revlist_args = STRING_LIST_INIT_NODUP;
73b49a75
SR
728 struct strbuf buf = STRBUF_INIT;
729
730 helper = get_helper(transport);
731
732 write_constant(helper->in, "export\n");
733
73b49a75
SR
734 strbuf_reset(&buf);
735
736 for (ref = remote_refs; ref; ref = ref->next) {
737 char *private;
738 unsigned char sha1[20];
739
740 if (!data->refspecs)
741 continue;
742 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
743 if (private && !get_sha1(private, sha1)) {
744 strbuf_addf(&buf, "^%s", private);
1d2f80fa 745 string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
73b49a75 746 }
2faa1527 747 free(private);
73b49a75 748
105fe3e4
SR
749 if (ref->deletion) {
750 die("remote-helpers do not support ref deletion");
751 }
752
3ea7d094
JK
753 if (ref->peer_ref)
754 string_list_append(&revlist_args, ref->peer_ref->name);
73b49a75
SR
755
756 }
757
a515ebe9 758 if (get_exporter(transport, &exporter, &revlist_args))
73b49a75
SR
759 die("Couldn't run fast-export");
760
cc567322
SR
761 if (finish_command(&exporter))
762 die("Error while running fast-export");
6c8151a3 763 push_update_refs_status(data, remote_refs);
73b49a75
SR
764 return 0;
765}
766
767static int push_refs(struct transport *transport,
768 struct ref *remote_refs, int flags)
769{
770 struct helper_data *data = transport->data;
771
772 if (process_connect(transport, 1)) {
773 do_take_over(transport);
774 return transport->push_refs(transport, remote_refs, flags);
775 }
776
777 if (!remote_refs) {
778 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
779 "Perhaps you should specify a branch such as 'master'.\n");
780 return 0;
781 }
782
783 if (data->push)
784 return push_refs_with_push(transport, remote_refs, flags);
785
786 if (data->export)
787 return push_refs_with_export(transport, remote_refs, flags);
788
789 return -1;
790}
791
792
f8ec9167
DB
793static int has_attribute(const char *attrs, const char *attr) {
794 int len;
795 if (!attrs)
796 return 0;
797
798 len = strlen(attr);
799 for (;;) {
800 const char *space = strchrnul(attrs, ' ');
801 if (len == space - attrs && !strncmp(attrs, attr, len))
802 return 1;
803 if (!*space)
804 return 0;
805 attrs = space + 1;
806 }
807}
808
6eb996b5
DB
809static struct ref *get_refs_list(struct transport *transport, int for_push)
810{
292ce46b 811 struct helper_data *data = transport->data;
6eb996b5
DB
812 struct child_process *helper;
813 struct ref *ret = NULL;
814 struct ref **tail = &ret;
815 struct ref *posn;
816 struct strbuf buf = STRBUF_INIT;
6eb996b5
DB
817
818 helper = get_helper(transport);
2d14d65c 819
fa8c097c
IL
820 if (process_connect(transport, for_push)) {
821 do_take_over(transport);
822 return transport->get_refs_list(transport, for_push);
823 }
824
ae4efe19
SP
825 if (data->push && for_push)
826 write_str_in_full(helper->in, "list for-push\n");
827 else
828 write_str_in_full(helper->in, "list\n");
6eb996b5 829
6eb996b5
DB
830 while (1) {
831 char *eov, *eon;
bf3c523c 832 recvline(data, &buf);
6eb996b5
DB
833
834 if (!*buf.buf)
835 break;
836
837 eov = strchr(buf.buf, ' ');
838 if (!eov)
839 die("Malformed response in ref list: %s", buf.buf);
840 eon = strchr(eov + 1, ' ');
841 *eov = '\0';
842 if (eon)
843 *eon = '\0';
844 *tail = alloc_ref(eov + 1);
845 if (buf.buf[0] == '@')
846 (*tail)->symref = xstrdup(buf.buf + 1);
847 else if (buf.buf[0] != '?')
848 get_sha1_hex(buf.buf, (*tail)->old_sha1);
f8ec9167
DB
849 if (eon) {
850 if (has_attribute(eon + 1, "unchanged")) {
851 (*tail)->status |= REF_STATUS_UPTODATE;
852 read_ref((*tail)->name, (*tail)->old_sha1);
853 }
854 }
6eb996b5
DB
855 tail = &((*tail)->next);
856 }
bf3c523c
IL
857 if (debug)
858 fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5
DB
859 strbuf_release(&buf);
860
861 for (posn = ret; posn; posn = posn->next)
862 resolve_remote_symref(posn, ret);
863
864 return ret;
865}
866
c9e388bb 867int transport_helper_init(struct transport *transport, const char *name)
6eb996b5
DB
868{
869 struct helper_data *data = xcalloc(sizeof(*data), 1);
c9e388bb 870 data->name = name;
6eb996b5 871
bf3c523c
IL
872 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
873 debug = 1;
874
6eb996b5 875 transport->data = data;
ef08ef9e 876 transport->set_option = set_helper_option;
6eb996b5
DB
877 transport->get_refs_list = get_refs_list;
878 transport->fetch = fetch;
ae4efe19 879 transport->push_refs = push_refs;
f2a37151 880 transport->disconnect = release_helper;
b236752a 881 transport->connect = connect_helper;
61b075bd 882 transport->smart_options = &(data->transport_options);
6eb996b5
DB
883 return 0;
884}
419f37db
IL
885
886/*
887 * Linux pipes can buffer 65536 bytes at once (and most platforms can
888 * buffer less), so attempt reads and writes with up to that size.
889 */
890#define BUFFERSIZE 65536
891/* This should be enough to hold debugging message. */
892#define PBUFFERSIZE 8192
893
894/* Print bidirectional transfer loop debug message. */
895static void transfer_debug(const char *fmt, ...)
896{
897 va_list args;
898 char msgbuf[PBUFFERSIZE];
899 static int debug_enabled = -1;
900
901 if (debug_enabled < 0)
902 debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
903 if (!debug_enabled)
904 return;
905
906 va_start(args, fmt);
907 vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
908 va_end(args);
909 fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
910}
911
912/* Stream state: More data may be coming in this direction. */
913#define SSTATE_TRANSFERING 0
914/*
915 * Stream state: No more data coming in this direction, flushing rest of
916 * data.
917 */
918#define SSTATE_FLUSHING 1
919/* Stream state: Transfer in this direction finished. */
920#define SSTATE_FINISHED 2
921
922#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
923#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
924#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
925
926/* Unidirectional transfer. */
927struct unidirectional_transfer {
928 /* Source */
929 int src;
930 /* Destination */
931 int dest;
932 /* Is source socket? */
933 int src_is_sock;
934 /* Is destination socket? */
935 int dest_is_sock;
936 /* Transfer state (TRANSFERING/FLUSHING/FINISHED) */
937 int state;
938 /* Buffer. */
939 char buf[BUFFERSIZE];
940 /* Buffer used. */
941 size_t bufuse;
942 /* Name of source. */
943 const char *src_name;
944 /* Name of destination. */
945 const char *dest_name;
946};
947
948/* Closes the target (for writing) if transfer has finished. */
949static void udt_close_if_finished(struct unidirectional_transfer *t)
950{
951 if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
952 t->state = SSTATE_FINISHED;
953 if (t->dest_is_sock)
954 shutdown(t->dest, SHUT_WR);
955 else
956 close(t->dest);
957 transfer_debug("Closed %s.", t->dest_name);
958 }
959}
960
961/*
962 * Tries to read read data from source into buffer. If buffer is full,
963 * no data is read. Returns 0 on success, -1 on error.
964 */
965static int udt_do_read(struct unidirectional_transfer *t)
966{
967 ssize_t bytes;
968
969 if (t->bufuse == BUFFERSIZE)
970 return 0; /* No space for more. */
971
972 transfer_debug("%s is readable", t->src_name);
973 bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
974 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
975 errno != EINTR) {
976 error("read(%s) failed: %s", t->src_name, strerror(errno));
977 return -1;
978 } else if (bytes == 0) {
979 transfer_debug("%s EOF (with %i bytes in buffer)",
980 t->src_name, t->bufuse);
981 t->state = SSTATE_FLUSHING;
982 } else if (bytes > 0) {
983 t->bufuse += bytes;
984 transfer_debug("Read %i bytes from %s (buffer now at %i)",
985 (int)bytes, t->src_name, (int)t->bufuse);
986 }
987 return 0;
988}
989
990/* Tries to write data from buffer into destination. If buffer is empty,
991 * no data is written. Returns 0 on success, -1 on error.
992 */
993static int udt_do_write(struct unidirectional_transfer *t)
994{
803dbdb9 995 ssize_t bytes;
419f37db
IL
996
997 if (t->bufuse == 0)
998 return 0; /* Nothing to write. */
999
1000 transfer_debug("%s is writable", t->dest_name);
1001 bytes = write(t->dest, t->buf, t->bufuse);
1002 if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1003 errno != EINTR) {
1004 error("write(%s) failed: %s", t->dest_name, strerror(errno));
1005 return -1;
1006 } else if (bytes > 0) {
1007 t->bufuse -= bytes;
1008 if (t->bufuse)
1009 memmove(t->buf, t->buf + bytes, t->bufuse);
1010 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1011 (int)bytes, t->dest_name, (int)t->bufuse);
1012 }
1013 return 0;
1014}
1015
1016
1017/* State of bidirectional transfer loop. */
1018struct bidirectional_transfer_state {
1019 /* Direction from program to git. */
1020 struct unidirectional_transfer ptg;
1021 /* Direction from git to program. */
1022 struct unidirectional_transfer gtp;
1023};
1024
1025static void *udt_copy_task_routine(void *udt)
1026{
1027 struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1028 while (t->state != SSTATE_FINISHED) {
1029 if (STATE_NEEDS_READING(t->state))
1030 if (udt_do_read(t))
1031 return NULL;
1032 if (STATE_NEEDS_WRITING(t->state))
1033 if (udt_do_write(t))
1034 return NULL;
1035 if (STATE_NEEDS_CLOSING(t->state))
1036 udt_close_if_finished(t);
1037 }
1038 return udt; /* Just some non-NULL value. */
1039}
1040
1041#ifndef NO_PTHREADS
1042
1043/*
1044 * Join thread, with apporiate errors on failure. Name is name for the
1045 * thread (for error messages). Returns 0 on success, 1 on failure.
1046 */
1047static int tloop_join(pthread_t thread, const char *name)
1048{
1049 int err;
1050 void *tret;
1051 err = pthread_join(thread, &tret);
1052 if (!tret) {
1053 error("%s thread failed", name);
1054 return 1;
1055 }
1056 if (err) {
1057 error("%s thread failed to join: %s", name, strerror(err));
1058 return 1;
1059 }
1060 return 0;
1061}
1062
1063/*
1064 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1065 * -1 on failure.
1066 */
1067static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1068{
1069 pthread_t gtp_thread;
1070 pthread_t ptg_thread;
1071 int err;
1072 int ret = 0;
1073 err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1074 &s->gtp);
1075 if (err)
1076 die("Can't start thread for copying data: %s", strerror(err));
1077 err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1078 &s->ptg);
1079 if (err)
1080 die("Can't start thread for copying data: %s", strerror(err));
1081
1082 ret |= tloop_join(gtp_thread, "Git to program copy");
1083 ret |= tloop_join(ptg_thread, "Program to git copy");
1084 return ret;
1085}
1086#else
1087
1088/* Close the source and target (for writing) for transfer. */
1089static void udt_kill_transfer(struct unidirectional_transfer *t)
1090{
1091 t->state = SSTATE_FINISHED;
1092 /*
1093 * Socket read end left open isn't a disaster if nobody
1094 * attempts to read from it (mingw compat headers do not
1095 * have SHUT_RD)...
1096 *
1097 * We can't fully close the socket since otherwise gtp
1098 * task would first close the socket it sends data to
1099 * while closing the ptg file descriptors.
1100 */
1101 if (!t->src_is_sock)
1102 close(t->src);
1103 if (t->dest_is_sock)
1104 shutdown(t->dest, SHUT_WR);
1105 else
1106 close(t->dest);
1107}
1108
1109/*
1110 * Join process, with apporiate errors on failure. Name is name for the
1111 * process (for error messages). Returns 0 on success, 1 on failure.
1112 */
1113static int tloop_join(pid_t pid, const char *name)
1114{
1115 int tret;
1116 if (waitpid(pid, &tret, 0) < 0) {
1117 error("%s process failed to wait: %s", name, strerror(errno));
1118 return 1;
1119 }
1120 if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1121 error("%s process failed", name);
1122 return 1;
1123 }
1124 return 0;
1125}
1126
1127/*
1128 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1129 * -1 on failure.
1130 */
1131static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1132{
1133 pid_t pid1, pid2;
1134 int ret = 0;
1135
1136 /* Fork thread #1: git to program. */
1137 pid1 = fork();
1138 if (pid1 < 0)
1139 die_errno("Can't start thread for copying data");
1140 else if (pid1 == 0) {
1141 udt_kill_transfer(&s->ptg);
1142 exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1143 }
1144
1145 /* Fork thread #2: program to git. */
1146 pid2 = fork();
1147 if (pid2 < 0)
1148 die_errno("Can't start thread for copying data");
1149 else if (pid2 == 0) {
1150 udt_kill_transfer(&s->gtp);
1151 exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1152 }
1153
1154 /*
1155 * Close both streams in parent as to not interfere with
1156 * end of file detection and wait for both tasks to finish.
1157 */
1158 udt_kill_transfer(&s->gtp);
1159 udt_kill_transfer(&s->ptg);
1160 ret |= tloop_join(pid1, "Git to program copy");
1161 ret |= tloop_join(pid2, "Program to git copy");
1162 return ret;
1163}
1164#endif
1165
1166/*
1167 * Copies data from stdin to output and from input to stdout simultaneously.
1168 * Additionally filtering through given filter. If filter is NULL, uses
1169 * identity filter.
1170 */
1171int bidirectional_transfer_loop(int input, int output)
1172{
1173 struct bidirectional_transfer_state state;
1174
1175 /* Fill the state fields. */
1176 state.ptg.src = input;
1177 state.ptg.dest = 1;
1178 state.ptg.src_is_sock = (input == output);
1179 state.ptg.dest_is_sock = 0;
1180 state.ptg.state = SSTATE_TRANSFERING;
1181 state.ptg.bufuse = 0;
1182 state.ptg.src_name = "remote input";
1183 state.ptg.dest_name = "stdout";
1184
1185 state.gtp.src = 0;
1186 state.gtp.dest = output;
1187 state.gtp.src_is_sock = 0;
1188 state.gtp.dest_is_sock = (input == output);
1189 state.gtp.state = SSTATE_TRANSFERING;
1190 state.gtp.bufuse = 0;
1191 state.gtp.src_name = "stdin";
1192 state.gtp.dest_name = "remote output";
1193
1194 return tloop_spawnwait_tasks(&state);
1195}