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Merge branch 'jk/no-sigpipe-during-network-transport'
[git.git] / transport.c
blobd0608df5c90cab4d2e2a2071a7416aeac75004e1
1 #include "cache.h"
2 #include "config.h"
3 #include "transport.h"
4 #include "run-command.h"
5 #include "pkt-line.h"
6 #include "fetch-pack.h"
7 #include "remote.h"
8 #include "connect.h"
9 #include "send-pack.h"
10 #include "walker.h"
11 #include "bundle.h"
12 #include "dir.h"
13 #include "refs.h"
14 #include "refspec.h"
15 #include "branch.h"
16 #include "url.h"
17 #include "submodule.h"
18 #include "string-list.h"
19 #include "sha1-array.h"
20 #include "sigchain.h"
21 #include "transport-internal.h"
22 #include "protocol.h"
23 #include "object-store.h"
24 #include "color.h"
25
26 static int transport_use_color = -1;
27 static char transport_colors[][COLOR_MAXLEN] = {
28 GIT_COLOR_RESET,
29 GIT_COLOR_RED /* REJECTED */
30 };
31
32 enum color_transport {
33 TRANSPORT_COLOR_RESET = 0,
34 TRANSPORT_COLOR_REJECTED = 1
35 };
36
37 static int transport_color_config(void)
38 {
39 const char *keys[] = {
40 "color.transport.reset",
41 "color.transport.rejected"
42 }, *key = "color.transport";
43 char *value;
44 int i;
45 static int initialized;
46
47 if (initialized)
48 return 0;
49 initialized = 1;
50
51 if (!git_config_get_string(key, &value))
52 transport_use_color = git_config_colorbool(key, value);
53
54 if (!want_color_stderr(transport_use_color))
55 return 0;
56
57 for (i = 0; i < ARRAY_SIZE(keys); i++)
58 if (!git_config_get_string(keys[i], &value)) {
59 if (!value)
60 return config_error_nonbool(keys[i]);
61 if (color_parse(value, transport_colors[i]) < 0)
62 return -1;
63 }
64
65 return 0;
66 }
67
68 static const char *transport_get_color(enum color_transport ix)
69 {
70 if (want_color_stderr(transport_use_color))
71 return transport_colors[ix];
72 return "";
73 }
74
75 static void set_upstreams(struct transport *transport, struct ref *refs,
76 int pretend)
77 {
78 struct ref *ref;
79 for (ref = refs; ref; ref = ref->next) {
80 const char *localname;
81 const char *tmp;
82 const char *remotename;
83 int flag = 0;
84 /*
85 * Check suitability for tracking. Must be successful /
86 * already up-to-date ref create/modify (not delete).
87 */
88 if (ref->status != REF_STATUS_OK &&
89 ref->status != REF_STATUS_UPTODATE)
90 continue;
91 if (!ref->peer_ref)
92 continue;
93 if (is_null_oid(&ref->new_oid))
94 continue;
95
96 /* Follow symbolic refs (mainly for HEAD). */
97 localname = ref->peer_ref->name;
98 remotename = ref->name;
99 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
100 NULL, &flag);
101 if (tmp && flag & REF_ISSYMREF &&
102 starts_with(tmp, "refs/heads/"))
103 localname = tmp;
104
105 /* Both source and destination must be local branches. */
106 if (!localname || !starts_with(localname, "refs/heads/"))
107 continue;
108 if (!remotename || !starts_with(remotename, "refs/heads/"))
109 continue;
110
111 if (!pretend)
112 install_branch_config(BRANCH_CONFIG_VERBOSE,
113 localname + 11, transport->remote->name,
114 remotename);
115 else
116 printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
117 localname + 11, remotename + 11,
118 transport->remote->name);
119 }
120 }
121
122 struct bundle_transport_data {
123 int fd;
124 struct bundle_header header;
125 };
126
127 static struct ref *get_refs_from_bundle(struct transport *transport,
128 int for_push,
129 const struct argv_array *ref_prefixes)
130 {
131 struct bundle_transport_data *data = transport->data;
132 struct ref *result = NULL;
133 int i;
134
135 if (for_push)
136 return NULL;
137
138 if (data->fd > 0)
139 close(data->fd);
140 data->fd = read_bundle_header(transport->url, &data->header);
141 if (data->fd < 0)
142 die(_("could not read bundle '%s'"), transport->url);
143 for (i = 0; i < data->header.references.nr; i++) {
144 struct ref_list_entry *e = data->header.references.list + i;
145 struct ref *ref = alloc_ref(e->name);
146 oidcpy(&ref->old_oid, &e->oid);
147 ref->next = result;
148 result = ref;
149 }
150 return result;
151 }
152
153 static int fetch_refs_from_bundle(struct transport *transport,
154 int nr_heads, struct ref **to_fetch)
155 {
156 struct bundle_transport_data *data = transport->data;
157 return unbundle(the_repository, &data->header, data->fd,
158 transport->progress ? BUNDLE_VERBOSE : 0);
159 }
160
161 static int close_bundle(struct transport *transport)
162 {
163 struct bundle_transport_data *data = transport->data;
164 if (data->fd > 0)
165 close(data->fd);
166 free(data);
167 return 0;
168 }
169
170 struct git_transport_data {
171 struct git_transport_options options;
172 struct child_process *conn;
173 int fd[2];
174 unsigned got_remote_heads : 1;
175 enum protocol_version version;
176 struct oid_array extra_have;
177 struct oid_array shallow;
178 };
179
180 static int set_git_option(struct git_transport_options *opts,
181 const char *name, const char *value)
182 {
183 if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
184 opts->uploadpack = value;
185 return 0;
186 } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
187 opts->receivepack = value;
188 return 0;
189 } else if (!strcmp(name, TRANS_OPT_THIN)) {
190 opts->thin = !!value;
191 return 0;
192 } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
193 opts->followtags = !!value;
194 return 0;
195 } else if (!strcmp(name, TRANS_OPT_KEEP)) {
196 opts->keep = !!value;
197 return 0;
198 } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
199 opts->update_shallow = !!value;
200 return 0;
201 } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
202 if (!value)
203 opts->depth = 0;
204 else {
205 char *end;
206 opts->depth = strtol(value, &end, 0);
207 if (*end)
208 die(_("transport: invalid depth option '%s'"), value);
209 }
210 return 0;
211 } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
212 opts->deepen_since = value;
213 return 0;
214 } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
215 opts->deepen_not = (const struct string_list *)value;
216 return 0;
217 } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
218 opts->deepen_relative = !!value;
219 return 0;
220 } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
221 opts->from_promisor = !!value;
222 return 0;
223 } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
224 opts->no_dependents = !!value;
225 return 0;
226 } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
227 parse_list_objects_filter(&opts->filter_options, value);
228 return 0;
229 }
230 return 1;
231 }
232
233 static int connect_setup(struct transport *transport, int for_push)
234 {
235 struct git_transport_data *data = transport->data;
236 int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
237
238 if (data->conn)
239 return 0;
240
241 switch (transport->family) {
242 case TRANSPORT_FAMILY_ALL: break;
243 case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
244 case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
245 }
246
247 data->conn = git_connect(data->fd, transport->url,
248 for_push ? data->options.receivepack :
249 data->options.uploadpack,
250 flags);
251
252 return 0;
253 }
254
255 /*
256 * Obtains the protocol version from the transport and writes it to
257 * transport->data->version, first connecting if not already connected.
258 *
259 * If the protocol version is one that allows skipping the listing of remote
260 * refs, and must_list_refs is 0, the listing of remote refs is skipped and
261 * this function returns NULL. Otherwise, this function returns the list of
262 * remote refs.
263 */
264 static struct ref *handshake(struct transport *transport, int for_push,
265 const struct argv_array *ref_prefixes,
266 int must_list_refs)
267 {
268 struct git_transport_data *data = transport->data;
269 struct ref *refs = NULL;
270 struct packet_reader reader;
271
272 connect_setup(transport, for_push);
273
274 packet_reader_init(&reader, data->fd[0], NULL, 0,
275 PACKET_READ_CHOMP_NEWLINE |
276 PACKET_READ_GENTLE_ON_EOF |
277 PACKET_READ_DIE_ON_ERR_PACKET);
278
279 data->version = discover_version(&reader);
280 switch (data->version) {
281 case protocol_v2:
282 if (must_list_refs)
283 get_remote_refs(data->fd[1], &reader, &refs, for_push,
284 ref_prefixes,
285 transport->server_options);
286 break;
287 case protocol_v1:
288 case protocol_v0:
289 get_remote_heads(&reader, &refs,
290 for_push ? REF_NORMAL : 0,
291 &data->extra_have,
292 &data->shallow);
293 break;
294 case protocol_unknown_version:
295 BUG("unknown protocol version");
296 }
297 data->got_remote_heads = 1;
298
299 if (reader.line_peeked)
300 BUG("buffer must be empty at the end of handshake()");
301
302 return refs;
303 }
304
305 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
306 const struct argv_array *ref_prefixes)
307 {
308 return handshake(transport, for_push, ref_prefixes, 1);
309 }
310
311 static int fetch_refs_via_pack(struct transport *transport,
312 int nr_heads, struct ref **to_fetch)
313 {
314 int ret = 0;
315 struct git_transport_data *data = transport->data;
316 struct ref *refs = NULL;
317 char *dest = xstrdup(transport->url);
318 struct fetch_pack_args args;
319 struct ref *refs_tmp = NULL;
320
321 memset(&args, 0, sizeof(args));
322 args.uploadpack = data->options.uploadpack;
323 args.keep_pack = data->options.keep;
324 args.lock_pack = 1;
325 args.use_thin_pack = data->options.thin;
326 args.include_tag = data->options.followtags;
327 args.verbose = (transport->verbose > 1);
328 args.quiet = (transport->verbose < 0);
329 args.no_progress = !transport->progress;
330 args.depth = data->options.depth;
331 args.deepen_since = data->options.deepen_since;
332 args.deepen_not = data->options.deepen_not;
333 args.deepen_relative = data->options.deepen_relative;
334 args.check_self_contained_and_connected =
335 data->options.check_self_contained_and_connected;
336 args.cloning = transport->cloning;
337 args.update_shallow = data->options.update_shallow;
338 args.from_promisor = data->options.from_promisor;
339 args.no_dependents = data->options.no_dependents;
340 args.filter_options = data->options.filter_options;
341 args.stateless_rpc = transport->stateless_rpc;
342 args.server_options = transport->server_options;
343 args.negotiation_tips = data->options.negotiation_tips;
344
345 if (!data->got_remote_heads) {
346 int i;
347 int must_list_refs = 0;
348 for (i = 0; i < nr_heads; i++) {
349 if (!to_fetch[i]->exact_oid) {
350 must_list_refs = 1;
351 break;
352 }
353 }
354 refs_tmp = handshake(transport, 0, NULL, must_list_refs);
355 }
356
357 switch (data->version) {
358 case protocol_v2:
359 refs = fetch_pack(&args, data->fd, data->conn,
360 refs_tmp ? refs_tmp : transport->remote_refs,
361 dest, to_fetch, nr_heads, &data->shallow,
362 &transport->pack_lockfile, data->version);
363 break;
364 case protocol_v1:
365 case protocol_v0:
366 refs = fetch_pack(&args, data->fd, data->conn,
367 refs_tmp ? refs_tmp : transport->remote_refs,
368 dest, to_fetch, nr_heads, &data->shallow,
369 &transport->pack_lockfile, data->version);
370 break;
371 case protocol_unknown_version:
372 BUG("unknown protocol version");
373 }
374
375 close(data->fd[0]);
376 close(data->fd[1]);
377 if (finish_connect(data->conn))
378 ret = -1;
379 data->conn = NULL;
380 data->got_remote_heads = 0;
381 data->options.self_contained_and_connected =
382 args.self_contained_and_connected;
383 data->options.connectivity_checked = args.connectivity_checked;
384
385 if (refs == NULL)
386 ret = -1;
387 if (report_unmatched_refs(to_fetch, nr_heads))
388 ret = -1;
389
390 free_refs(refs_tmp);
391 free_refs(refs);
392 free(dest);
393 return ret;
394 }
395
396 static int push_had_errors(struct ref *ref)
397 {
398 for (; ref; ref = ref->next) {
399 switch (ref->status) {
400 case REF_STATUS_NONE:
401 case REF_STATUS_UPTODATE:
402 case REF_STATUS_OK:
403 break;
404 default:
405 return 1;
406 }
407 }
408 return 0;
409 }
410
411 int transport_refs_pushed(struct ref *ref)
412 {
413 for (; ref; ref = ref->next) {
414 switch(ref->status) {
415 case REF_STATUS_NONE:
416 case REF_STATUS_UPTODATE:
417 break;
418 default:
419 return 1;
420 }
421 }
422 return 0;
423 }
424
425 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
426 {
427 struct refspec_item rs;
428
429 if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
430 return;
431
432 rs.src = ref->name;
433 rs.dst = NULL;
434
435 if (!remote_find_tracking(remote, &rs)) {
436 if (verbose)
437 fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
438 if (ref->deletion) {
439 delete_ref(NULL, rs.dst, NULL, 0);
440 } else
441 update_ref("update by push", rs.dst, &ref->new_oid,
442 NULL, 0, 0);
443 free(rs.dst);
444 }
445 }
446
447 static void print_ref_status(char flag, const char *summary,
448 struct ref *to, struct ref *from, const char *msg,
449 int porcelain, int summary_width)
450 {
451 if (porcelain) {
452 if (from)
453 fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
454 else
455 fprintf(stdout, "%c\t:%s\t", flag, to->name);
456 if (msg)
457 fprintf(stdout, "%s (%s)\n", summary, msg);
458 else
459 fprintf(stdout, "%s\n", summary);
460 } else {
461 const char *red = "", *reset = "";
462 if (push_had_errors(to)) {
463 red = transport_get_color(TRANSPORT_COLOR_REJECTED);
464 reset = transport_get_color(TRANSPORT_COLOR_RESET);
465 }
466 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
467 summary, reset);
468 if (from)
469 fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
470 else
471 fputs(prettify_refname(to->name), stderr);
472 if (msg) {
473 fputs(" (", stderr);
474 fputs(msg, stderr);
475 fputc(')', stderr);
476 }
477 fputc('\n', stderr);
478 }
479 }
480
481 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
482 {
483 if (ref->deletion)
484 print_ref_status('-', "[deleted]", ref, NULL, NULL,
485 porcelain, summary_width);
486 else if (is_null_oid(&ref->old_oid))
487 print_ref_status('*',
488 (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
489 "[new branch]"),
490 ref, ref->peer_ref, NULL, porcelain, summary_width);
491 else {
492 struct strbuf quickref = STRBUF_INIT;
493 char type;
494 const char *msg;
495
496 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
497 DEFAULT_ABBREV);
498 if (ref->forced_update) {
499 strbuf_addstr(&quickref, "...");
500 type = '+';
501 msg = "forced update";
502 } else {
503 strbuf_addstr(&quickref, "..");
504 type = ' ';
505 msg = NULL;
506 }
507 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
508 DEFAULT_ABBREV);
509
510 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
511 porcelain, summary_width);
512 strbuf_release(&quickref);
513 }
514 }
515
516 static int print_one_push_status(struct ref *ref, const char *dest, int count,
517 int porcelain, int summary_width)
518 {
519 if (!count) {
520 char *url = transport_anonymize_url(dest);
521 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
522 free(url);
523 }
524
525 switch(ref->status) {
526 case REF_STATUS_NONE:
527 print_ref_status('X', "[no match]", ref, NULL, NULL,
528 porcelain, summary_width);
529 break;
530 case REF_STATUS_REJECT_NODELETE:
531 print_ref_status('!', "[rejected]", ref, NULL,
532 "remote does not support deleting refs",
533 porcelain, summary_width);
534 break;
535 case REF_STATUS_UPTODATE:
536 print_ref_status('=', "[up to date]", ref,
537 ref->peer_ref, NULL, porcelain, summary_width);
538 break;
539 case REF_STATUS_REJECT_NONFASTFORWARD:
540 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
541 "non-fast-forward", porcelain, summary_width);
542 break;
543 case REF_STATUS_REJECT_ALREADY_EXISTS:
544 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
545 "already exists", porcelain, summary_width);
546 break;
547 case REF_STATUS_REJECT_FETCH_FIRST:
548 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
549 "fetch first", porcelain, summary_width);
550 break;
551 case REF_STATUS_REJECT_NEEDS_FORCE:
552 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
553 "needs force", porcelain, summary_width);
554 break;
555 case REF_STATUS_REJECT_STALE:
556 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
557 "stale info", porcelain, summary_width);
558 break;
559 case REF_STATUS_REJECT_SHALLOW:
560 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
561 "new shallow roots not allowed",
562 porcelain, summary_width);
563 break;
564 case REF_STATUS_REMOTE_REJECT:
565 print_ref_status('!', "[remote rejected]", ref,
566 ref->deletion ? NULL : ref->peer_ref,
567 ref->remote_status, porcelain, summary_width);
568 break;
569 case REF_STATUS_EXPECTING_REPORT:
570 print_ref_status('!', "[remote failure]", ref,
571 ref->deletion ? NULL : ref->peer_ref,
572 "remote failed to report status",
573 porcelain, summary_width);
574 break;
575 case REF_STATUS_ATOMIC_PUSH_FAILED:
576 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
577 "atomic push failed", porcelain, summary_width);
578 break;
579 case REF_STATUS_OK:
580 print_ok_ref_status(ref, porcelain, summary_width);
581 break;
582 }
583
584 return 1;
585 }
586
587 static int measure_abbrev(const struct object_id *oid, int sofar)
588 {
589 char hex[GIT_MAX_HEXSZ + 1];
590 int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
591
592 return (w < sofar) ? sofar : w;
593 }
594
595 int transport_summary_width(const struct ref *refs)
596 {
597 int maxw = -1;
598
599 for (; refs; refs = refs->next) {
600 maxw = measure_abbrev(&refs->old_oid, maxw);
601 maxw = measure_abbrev(&refs->new_oid, maxw);
602 }
603 if (maxw < 0)
604 maxw = FALLBACK_DEFAULT_ABBREV;
605 return (2 * maxw + 3);
606 }
607
608 void transport_print_push_status(const char *dest, struct ref *refs,
609 int verbose, int porcelain, unsigned int *reject_reasons)
610 {
611 struct ref *ref;
612 int n = 0;
613 char *head;
614 int summary_width = transport_summary_width(refs);
615
616 if (transport_color_config() < 0)
617 warning(_("could not parse transport.color.* config"));
618
619 head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
620
621 if (verbose) {
622 for (ref = refs; ref; ref = ref->next)
623 if (ref->status == REF_STATUS_UPTODATE)
624 n += print_one_push_status(ref, dest, n,
625 porcelain, summary_width);
626 }
627
628 for (ref = refs; ref; ref = ref->next)
629 if (ref->status == REF_STATUS_OK)
630 n += print_one_push_status(ref, dest, n,
631 porcelain, summary_width);
632
633 *reject_reasons = 0;
634 for (ref = refs; ref; ref = ref->next) {
635 if (ref->status != REF_STATUS_NONE &&
636 ref->status != REF_STATUS_UPTODATE &&
637 ref->status != REF_STATUS_OK)
638 n += print_one_push_status(ref, dest, n,
639 porcelain, summary_width);
640 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
641 if (head != NULL && !strcmp(head, ref->name))
642 *reject_reasons |= REJECT_NON_FF_HEAD;
643 else
644 *reject_reasons |= REJECT_NON_FF_OTHER;
645 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
646 *reject_reasons |= REJECT_ALREADY_EXISTS;
647 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
648 *reject_reasons |= REJECT_FETCH_FIRST;
649 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
650 *reject_reasons |= REJECT_NEEDS_FORCE;
651 }
652 }
653 free(head);
654 }
655
656 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
657 {
658 struct git_transport_data *data = transport->data;
659 struct send_pack_args args;
660 int ret = 0;
661
662 if (transport_color_config() < 0)
663 return -1;
664
665 if (!data->got_remote_heads)
666 get_refs_via_connect(transport, 1, NULL);
667
668 memset(&args, 0, sizeof(args));
669 args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
670 args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
671 args.use_thin_pack = data->options.thin;
672 args.verbose = (transport->verbose > 0);
673 args.quiet = (transport->verbose < 0);
674 args.progress = transport->progress;
675 args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
676 args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
677 args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
678 args.push_options = transport->push_options;
679 args.url = transport->url;
680
681 if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
682 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
683 else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
684 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
685 else
686 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
687
688 switch (data->version) {
689 case protocol_v2:
690 die(_("support for protocol v2 not implemented yet"));
691 break;
692 case protocol_v1:
693 case protocol_v0:
694 ret = send_pack(&args, data->fd, data->conn, remote_refs,
695 &data->extra_have);
696 break;
697 case protocol_unknown_version:
698 BUG("unknown protocol version");
699 }
700
701 close(data->fd[1]);
702 close(data->fd[0]);
703 ret |= finish_connect(data->conn);
704 data->conn = NULL;
705 data->got_remote_heads = 0;
706
707 return ret;
708 }
709
710 static int connect_git(struct transport *transport, const char *name,
711 const char *executable, int fd[2])
712 {
713 struct git_transport_data *data = transport->data;
714 data->conn = git_connect(data->fd, transport->url,
715 executable, 0);
716 fd[0] = data->fd[0];
717 fd[1] = data->fd[1];
718 return 0;
719 }
720
721 static int disconnect_git(struct transport *transport)
722 {
723 struct git_transport_data *data = transport->data;
724 if (data->conn) {
725 if (data->got_remote_heads)
726 packet_flush(data->fd[1]);
727 close(data->fd[0]);
728 close(data->fd[1]);
729 finish_connect(data->conn);
730 }
731
732 free(data);
733 return 0;
734 }
735
736 static struct transport_vtable taken_over_vtable = {
737 1,
738 NULL,
739 get_refs_via_connect,
740 fetch_refs_via_pack,
741 git_transport_push,
742 NULL,
743 disconnect_git
744 };
745
746 void transport_take_over(struct transport *transport,
747 struct child_process *child)
748 {
749 struct git_transport_data *data;
750
751 if (!transport->smart_options)
752 BUG("taking over transport requires non-NULL "
753 "smart_options field.");
754
755 data = xcalloc(1, sizeof(*data));
756 data->options = *transport->smart_options;
757 data->conn = child;
758 data->fd[0] = data->conn->out;
759 data->fd[1] = data->conn->in;
760 data->got_remote_heads = 0;
761 transport->data = data;
762
763 transport->vtable = &taken_over_vtable;
764 transport->smart_options = &(data->options);
765
766 transport->cannot_reuse = 1;
767 }
768
769 static int is_file(const char *url)
770 {
771 struct stat buf;
772 if (stat(url, &buf))
773 return 0;
774 return S_ISREG(buf.st_mode);
775 }
776
777 static int external_specification_len(const char *url)
778 {
779 return strchr(url, ':') - url;
780 }
781
782 static const struct string_list *protocol_whitelist(void)
783 {
784 static int enabled = -1;
785 static struct string_list allowed = STRING_LIST_INIT_DUP;
786
787 if (enabled < 0) {
788 const char *v = getenv("GIT_ALLOW_PROTOCOL");
789 if (v) {
790 string_list_split(&allowed, v, ':', -1);
791 string_list_sort(&allowed);
792 enabled = 1;
793 } else {
794 enabled = 0;
795 }
796 }
797
798 return enabled ? &allowed : NULL;
799 }
800
801 enum protocol_allow_config {
802 PROTOCOL_ALLOW_NEVER = 0,
803 PROTOCOL_ALLOW_USER_ONLY,
804 PROTOCOL_ALLOW_ALWAYS
805 };
806
807 static enum protocol_allow_config parse_protocol_config(const char *key,
808 const char *value)
809 {
810 if (!strcasecmp(value, "always"))
811 return PROTOCOL_ALLOW_ALWAYS;
812 else if (!strcasecmp(value, "never"))
813 return PROTOCOL_ALLOW_NEVER;
814 else if (!strcasecmp(value, "user"))
815 return PROTOCOL_ALLOW_USER_ONLY;
816
817 die(_("unknown value for config '%s': %s"), key, value);
818 }
819
820 static enum protocol_allow_config get_protocol_config(const char *type)
821 {
822 char *key = xstrfmt("protocol.%s.allow", type);
823 char *value;
824
825 /* first check the per-protocol config */
826 if (!git_config_get_string(key, &value)) {
827 enum protocol_allow_config ret =
828 parse_protocol_config(key, value);
829 free(key);
830 free(value);
831 return ret;
832 }
833 free(key);
834
835 /* if defined, fallback to user-defined default for unknown protocols */
836 if (!git_config_get_string("protocol.allow", &value)) {
837 enum protocol_allow_config ret =
838 parse_protocol_config("protocol.allow", value);
839 free(value);
840 return ret;
841 }
842
843 /* fallback to built-in defaults */
844 /* known safe */
845 if (!strcmp(type, "http") ||
846 !strcmp(type, "https") ||
847 !strcmp(type, "git") ||
848 !strcmp(type, "ssh") ||
849 !strcmp(type, "file"))
850 return PROTOCOL_ALLOW_ALWAYS;
851
852 /* known scary; err on the side of caution */
853 if (!strcmp(type, "ext"))
854 return PROTOCOL_ALLOW_NEVER;
855
856 /* unknown; by default let them be used only directly by the user */
857 return PROTOCOL_ALLOW_USER_ONLY;
858 }
859
860 int is_transport_allowed(const char *type, int from_user)
861 {
862 const struct string_list *whitelist = protocol_whitelist();
863 if (whitelist)
864 return string_list_has_string(whitelist, type);
865
866 switch (get_protocol_config(type)) {
867 case PROTOCOL_ALLOW_ALWAYS:
868 return 1;
869 case PROTOCOL_ALLOW_NEVER:
870 return 0;
871 case PROTOCOL_ALLOW_USER_ONLY:
872 if (from_user < 0)
873 from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
874 return from_user;
875 }
876
877 BUG("invalid protocol_allow_config type");
878 }
879
880 void transport_check_allowed(const char *type)
881 {
882 if (!is_transport_allowed(type, -1))
883 die(_("transport '%s' not allowed"), type);
884 }
885
886 static struct transport_vtable bundle_vtable = {
887 0,
888 NULL,
889 get_refs_from_bundle,
890 fetch_refs_from_bundle,
891 NULL,
892 NULL,
893 close_bundle
894 };
895
896 static struct transport_vtable builtin_smart_vtable = {
897 1,
898 NULL,
899 get_refs_via_connect,
900 fetch_refs_via_pack,
901 git_transport_push,
902 connect_git,
903 disconnect_git
904 };
905
906 struct transport *transport_get(struct remote *remote, const char *url)
907 {
908 const char *helper;
909 struct transport *ret = xcalloc(1, sizeof(*ret));
910
911 ret->progress = isatty(2);
912
913 if (!remote)
914 BUG("No remote provided to transport_get()");
915
916 ret->got_remote_refs = 0;
917 ret->remote = remote;
918 helper = remote->foreign_vcs;
919
920 if (!url && remote->url)
921 url = remote->url[0];
922 ret->url = url;
923
924 /* maybe it is a foreign URL? */
925 if (url) {
926 const char *p = url;
927
928 while (is_urlschemechar(p == url, *p))
929 p++;
930 if (starts_with(p, "::"))
931 helper = xstrndup(url, p - url);
932 }
933
934 if (helper) {
935 transport_helper_init(ret, helper);
936 } else if (starts_with(url, "rsync:")) {
937 die(_("git-over-rsync is no longer supported"));
938 } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
939 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
940 transport_check_allowed("file");
941 ret->data = data;
942 ret->vtable = &bundle_vtable;
943 ret->smart_options = NULL;
944 } else if (!is_url(url)
945 || starts_with(url, "file://")
946 || starts_with(url, "git://")
947 || starts_with(url, "ssh://")
948 || starts_with(url, "git+ssh://") /* deprecated - do not use */
949 || starts_with(url, "ssh+git://") /* deprecated - do not use */
950 ) {
951 /*
952 * These are builtin smart transports; "allowed" transports
953 * will be checked individually in git_connect.
954 */
955 struct git_transport_data *data = xcalloc(1, sizeof(*data));
956 ret->data = data;
957 ret->vtable = &builtin_smart_vtable;
958 ret->smart_options = &(data->options);
959
960 data->conn = NULL;
961 data->got_remote_heads = 0;
962 } else {
963 /* Unknown protocol in URL. Pass to external handler. */
964 int len = external_specification_len(url);
965 char *handler = xmemdupz(url, len);
966 transport_helper_init(ret, handler);
967 }
968
969 if (ret->smart_options) {
970 ret->smart_options->thin = 1;
971 ret->smart_options->uploadpack = "git-upload-pack";
972 if (remote->uploadpack)
973 ret->smart_options->uploadpack = remote->uploadpack;
974 ret->smart_options->receivepack = "git-receive-pack";
975 if (remote->receivepack)
976 ret->smart_options->receivepack = remote->receivepack;
977 }
978
979 return ret;
980 }
981
982 int transport_set_option(struct transport *transport,
983 const char *name, const char *value)
984 {
985 int git_reports = 1, protocol_reports = 1;
986
987 if (transport->smart_options)
988 git_reports = set_git_option(transport->smart_options,
989 name, value);
990
991 if (transport->vtable->set_option)
992 protocol_reports = transport->vtable->set_option(transport,
993 name, value);
994
995 /* If either report is 0, report 0 (success). */
996 if (!git_reports || !protocol_reports)
997 return 0;
998 /* If either reports -1 (invalid value), report -1. */
999 if ((git_reports == -1) || (protocol_reports == -1))
1000 return -1;
1001 /* Otherwise if both report unknown, report unknown. */
1002 return 1;
1003 }
1004
1005 void transport_set_verbosity(struct transport *transport, int verbosity,
1006 int force_progress)
1007 {
1008 if (verbosity >= 1)
1009 transport->verbose = verbosity <= 3 ? verbosity : 3;
1010 if (verbosity < 0)
1011 transport->verbose = -1;
1012
1013 /**
1014 * Rules used to determine whether to report progress (processing aborts
1015 * when a rule is satisfied):
1016 *
1017 * . Report progress, if force_progress is 1 (ie. --progress).
1018 * . Don't report progress, if force_progress is 0 (ie. --no-progress).
1019 * . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1020 * . Report progress if isatty(2) is 1.
1021 **/
1022 if (force_progress >= 0)
1023 transport->progress = !!force_progress;
1024 else
1025 transport->progress = verbosity >= 0 && isatty(2);
1026 }
1027
1028 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1029 {
1030 int i;
1031
1032 fprintf(stderr, _("The following submodule paths contain changes that can\n"
1033 "not be found on any remote:\n"));
1034 for (i = 0; i < needs_pushing->nr; i++)
1035 fprintf(stderr, " %s\n", needs_pushing->items[i].string);
1036 fprintf(stderr, _("\nPlease try\n\n"
1037 " git push --recurse-submodules=on-demand\n\n"
1038 "or cd to the path and use\n\n"
1039 " git push\n\n"
1040 "to push them to a remote.\n\n"));
1041
1042 string_list_clear(needs_pushing, 0);
1043
1044 die(_("Aborting."));
1045 }
1046
1047 static int run_pre_push_hook(struct transport *transport,
1048 struct ref *remote_refs)
1049 {
1050 int ret = 0, x;
1051 struct ref *r;
1052 struct child_process proc = CHILD_PROCESS_INIT;
1053 struct strbuf buf;
1054 const char *argv[4];
1055
1056 if (!(argv[0] = find_hook("pre-push")))
1057 return 0;
1058
1059 argv[1] = transport->remote->name;
1060 argv[2] = transport->url;
1061 argv[3] = NULL;
1062
1063 proc.argv = argv;
1064 proc.in = -1;
1065 proc.trace2_hook_name = "pre-push";
1066
1067 if (start_command(&proc)) {
1068 finish_command(&proc);
1069 return -1;
1070 }
1071
1072 sigchain_push(SIGPIPE, SIG_IGN);
1073
1074 strbuf_init(&buf, 256);
1075
1076 for (r = remote_refs; r; r = r->next) {
1077 if (!r->peer_ref) continue;
1078 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1079 if (r->status == REF_STATUS_REJECT_STALE) continue;
1080 if (r->status == REF_STATUS_UPTODATE) continue;
1081
1082 strbuf_reset(&buf);
1083 strbuf_addf( &buf, "%s %s %s %s\n",
1084 r->peer_ref->name, oid_to_hex(&r->new_oid),
1085 r->name, oid_to_hex(&r->old_oid));
1086
1087 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1088 /* We do not mind if a hook does not read all refs. */
1089 if (errno != EPIPE)
1090 ret = -1;
1091 break;
1092 }
1093 }
1094
1095 strbuf_release(&buf);
1096
1097 x = close(proc.in);
1098 if (!ret)
1099 ret = x;
1100
1101 sigchain_pop(SIGPIPE);
1102
1103 x = finish_command(&proc);
1104 if (!ret)
1105 ret = x;
1106
1107 return ret;
1108 }
1109
1110 int transport_push(struct repository *r,
1111 struct transport *transport,
1112 struct refspec *rs, int flags,
1113 unsigned int *reject_reasons)
1114 {
1115 *reject_reasons = 0;
1116
1117 if (transport_color_config() < 0)
1118 return -1;
1119
1120 if (transport->vtable->push_refs) {
1121 struct ref *remote_refs;
1122 struct ref *local_refs = get_local_heads();
1123 int match_flags = MATCH_REFS_NONE;
1124 int verbose = (transport->verbose > 0);
1125 int quiet = (transport->verbose < 0);
1126 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1127 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1128 int push_ret, ret, err;
1129 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1130
1131 if (check_push_refs(local_refs, rs) < 0)
1132 return -1;
1133
1134 refspec_ref_prefixes(rs, &ref_prefixes);
1135
1136 remote_refs = transport->vtable->get_refs_list(transport, 1,
1137 &ref_prefixes);
1138
1139 argv_array_clear(&ref_prefixes);
1140
1141 if (flags & TRANSPORT_PUSH_ALL)
1142 match_flags |= MATCH_REFS_ALL;
1143 if (flags & TRANSPORT_PUSH_MIRROR)
1144 match_flags |= MATCH_REFS_MIRROR;
1145 if (flags & TRANSPORT_PUSH_PRUNE)
1146 match_flags |= MATCH_REFS_PRUNE;
1147 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1148 match_flags |= MATCH_REFS_FOLLOW_TAGS;
1149
1150 if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1151 return -1;
1152
1153 if (transport->smart_options &&
1154 transport->smart_options->cas &&
1155 !is_empty_cas(transport->smart_options->cas))
1156 apply_push_cas(transport->smart_options->cas,
1157 transport->remote, remote_refs);
1158
1159 set_ref_status_for_push(remote_refs,
1160 flags & TRANSPORT_PUSH_MIRROR,
1161 flags & TRANSPORT_PUSH_FORCE);
1162
1163 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1164 if (run_pre_push_hook(transport, remote_refs))
1165 return -1;
1166
1167 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1168 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1169 !is_bare_repository()) {
1170 struct ref *ref = remote_refs;
1171 struct oid_array commits = OID_ARRAY_INIT;
1172
1173 for (; ref; ref = ref->next)
1174 if (!is_null_oid(&ref->new_oid))
1175 oid_array_append(&commits,
1176 &ref->new_oid);
1177
1178 if (!push_unpushed_submodules(r,
1179 &commits,
1180 transport->remote,
1181 rs,
1182 transport->push_options,
1183 pretend)) {
1184 oid_array_clear(&commits);
1185 die(_("failed to push all needed submodules"));
1186 }
1187 oid_array_clear(&commits);
1188 }
1189
1190 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1191 ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1192 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1193 !pretend)) && !is_bare_repository()) {
1194 struct ref *ref = remote_refs;
1195 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1196 struct oid_array commits = OID_ARRAY_INIT;
1197
1198 for (; ref; ref = ref->next)
1199 if (!is_null_oid(&ref->new_oid))
1200 oid_array_append(&commits,
1201 &ref->new_oid);
1202
1203 if (find_unpushed_submodules(r,
1204 &commits,
1205 transport->remote->name,
1206 &needs_pushing)) {
1207 oid_array_clear(&commits);
1208 die_with_unpushed_submodules(&needs_pushing);
1209 }
1210 string_list_clear(&needs_pushing, 0);
1211 oid_array_clear(&commits);
1212 }
1213
1214 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1215 push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1216 else
1217 push_ret = 0;
1218 err = push_had_errors(remote_refs);
1219 ret = push_ret | err;
1220
1221 if (!quiet || err)
1222 transport_print_push_status(transport->url, remote_refs,
1223 verbose | porcelain, porcelain,
1224 reject_reasons);
1225
1226 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1227 set_upstreams(transport, remote_refs, pretend);
1228
1229 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1230 TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1231 struct ref *ref;
1232 for (ref = remote_refs; ref; ref = ref->next)
1233 transport_update_tracking_ref(transport->remote, ref, verbose);
1234 }
1235
1236 if (porcelain && !push_ret)
1237 puts("Done");
1238 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1239 fprintf(stderr, "Everything up-to-date\n");
1240
1241 return ret;
1242 }
1243 return 1;
1244 }
1245
1246 const struct ref *transport_get_remote_refs(struct transport *transport,
1247 const struct argv_array *ref_prefixes)
1248 {
1249 if (!transport->got_remote_refs) {
1250 transport->remote_refs =
1251 transport->vtable->get_refs_list(transport, 0,
1252 ref_prefixes);
1253 transport->got_remote_refs = 1;
1254 }
1255
1256 return transport->remote_refs;
1257 }
1258
1259 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1260 {
1261 int rc;
1262 int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1263 struct ref **heads = NULL;
1264 struct ref *rm;
1265
1266 if (!transport->vtable->fetch_without_list)
1267 /*
1268 * Some transports (e.g. the built-in bundle transport and the
1269 * transport helper interface) do not work when fetching is
1270 * done immediately after transport creation. List the remote
1271 * refs anyway (if not already listed) as a workaround.
1272 */
1273 transport_get_remote_refs(transport, NULL);
1274
1275 for (rm = refs; rm; rm = rm->next) {
1276 nr_refs++;
1277 if (rm->peer_ref &&
1278 !is_null_oid(&rm->old_oid) &&
1279 oideq(&rm->peer_ref->old_oid, &rm->old_oid))
1280 continue;
1281 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1282 heads[nr_heads++] = rm;
1283 }
1284
1285 if (!nr_heads) {
1286 /*
1287 * When deepening of a shallow repository is requested,
1288 * then local and remote refs are likely to still be equal.
1289 * Just feed them all to the fetch method in that case.
1290 * This condition shouldn't be met in a non-deepening fetch
1291 * (see builtin/fetch.c:quickfetch()).
1292 */
1293 ALLOC_ARRAY(heads, nr_refs);
1294 for (rm = refs; rm; rm = rm->next)
1295 heads[nr_heads++] = rm;
1296 }
1297
1298 rc = transport->vtable->fetch(transport, nr_heads, heads);
1299
1300 free(heads);
1301 return rc;
1302 }
1303
1304 void transport_unlock_pack(struct transport *transport)
1305 {
1306 if (transport->pack_lockfile) {
1307 unlink_or_warn(transport->pack_lockfile);
1308 FREE_AND_NULL(transport->pack_lockfile);
1309 }
1310 }
1311
1312 int transport_connect(struct transport *transport, const char *name,
1313 const char *exec, int fd[2])
1314 {
1315 if (transport->vtable->connect)
1316 return transport->vtable->connect(transport, name, exec, fd);
1317 else
1318 die(_("operation not supported by protocol"));
1319 }
1320
1321 int transport_disconnect(struct transport *transport)
1322 {
1323 int ret = 0;
1324 if (transport->vtable->disconnect)
1325 ret = transport->vtable->disconnect(transport);
1326 free(transport);
1327 return ret;
1328 }
1329
1330 /*
1331 * Strip username (and password) from a URL and return
1332 * it in a newly allocated string.
1333 */
1334 char *transport_anonymize_url(const char *url)
1335 {
1336 char *scheme_prefix, *anon_part;
1337 size_t anon_len, prefix_len = 0;
1338
1339 anon_part = strchr(url, '@');
1340 if (url_is_local_not_ssh(url) || !anon_part)
1341 goto literal_copy;
1342
1343 anon_len = strlen(++anon_part);
1344 scheme_prefix = strstr(url, "://");
1345 if (!scheme_prefix) {
1346 if (!strchr(anon_part, ':'))
1347 /* cannot be "me@there:/path/name" */
1348 goto literal_copy;
1349 } else {
1350 const char *cp;
1351 /* make sure scheme is reasonable */
1352 for (cp = url; cp < scheme_prefix; cp++) {
1353 switch (*cp) {
1354 /* RFC 1738 2.1 */
1355 case '+': case '.': case '-':
1356 break; /* ok */
1357 default:
1358 if (isalnum(*cp))
1359 break;
1360 /* it isn't */
1361 goto literal_copy;
1362 }
1363 }
1364 /* @ past the first slash does not count */
1365 cp = strchr(scheme_prefix + 3, '/');
1366 if (cp && cp < anon_part)
1367 goto literal_copy;
1368 prefix_len = scheme_prefix - url + 3;
1369 }
1370 return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1371 (int)anon_len, anon_part);
1372 literal_copy:
1373 return xstrdup(url);
1374 }
1375
1376 static void fill_alternate_refs_command(struct child_process *cmd,
1377 const char *repo_path)
1378 {
1379 const char *value;
1380
1381 if (!git_config_get_value("core.alternateRefsCommand", &value)) {
1382 cmd->use_shell = 1;
1383
1384 argv_array_push(&cmd->args, value);
1385 argv_array_push(&cmd->args, repo_path);
1386 } else {
1387 cmd->git_cmd = 1;
1388
1389 argv_array_pushf(&cmd->args, "--git-dir=%s", repo_path);
1390 argv_array_push(&cmd->args, "for-each-ref");
1391 argv_array_push(&cmd->args, "--format=%(objectname)");
1392
1393 if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
1394 argv_array_push(&cmd->args, "--");
1395 argv_array_split(&cmd->args, value);
1396 }
1397 }
1398
1399 cmd->env = local_repo_env;
1400 cmd->out = -1;
1401 }
1402
1403 static void read_alternate_refs(const char *path,
1404 alternate_ref_fn *cb,
1405 void *data)
1406 {
1407 struct child_process cmd = CHILD_PROCESS_INIT;
1408 struct strbuf line = STRBUF_INIT;
1409 FILE *fh;
1410
1411 fill_alternate_refs_command(&cmd, path);
1412
1413 if (start_command(&cmd))
1414 return;
1415
1416 fh = xfdopen(cmd.out, "r");
1417 while (strbuf_getline_lf(&line, fh) != EOF) {
1418 struct object_id oid;
1419 const char *p;
1420
1421 if (parse_oid_hex(line.buf, &oid, &p) || *p) {
1422 warning(_("invalid line while parsing alternate refs: %s"),
1423 line.buf);
1424 break;
1425 }
1426
1427 cb(&oid, data);
1428 }
1429
1430 fclose(fh);
1431 finish_command(&cmd);
1432 }
1433
1434 struct alternate_refs_data {
1435 alternate_ref_fn *fn;
1436 void *data;
1437 };
1438
1439 static int refs_from_alternate_cb(struct object_directory *e,
1440 void *data)
1441 {
1442 struct strbuf path = STRBUF_INIT;
1443 size_t base_len;
1444 struct alternate_refs_data *cb = data;
1445
1446 if (!strbuf_realpath(&path, e->path, 0))
1447 goto out;
1448 if (!strbuf_strip_suffix(&path, "/objects"))
1449 goto out;
1450 base_len = path.len;
1451
1452 /* Is this a git repository with refs? */
1453 strbuf_addstr(&path, "/refs");
1454 if (!is_directory(path.buf))
1455 goto out;
1456 strbuf_setlen(&path, base_len);
1457
1458 read_alternate_refs(path.buf, cb->fn, cb->data);
1459
1460 out:
1461 strbuf_release(&path);
1462 return 0;
1463 }
1464
1465 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1466 {
1467 struct alternate_refs_data cb;
1468 cb.fn = fn;
1469 cb.data = data;
1470 foreach_alt_odb(refs_from_alternate_cb, &cb);
1471 }
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