add 'git credential' plumbing command
[git/git.git] / builtin / fetch.c
1 /*
2 * "git fetch"
3 */
4 #include "cache.h"
5 #include "refs.h"
6 #include "commit.h"
7 #include "builtin.h"
8 #include "string-list.h"
9 #include "remote.h"
10 #include "transport.h"
11 #include "run-command.h"
12 #include "parse-options.h"
13 #include "sigchain.h"
14 #include "transport.h"
15 #include "submodule.h"
16 #include "connected.h"
17
18 static const char * const builtin_fetch_usage[] = {
19 "git fetch [<options>] [<repository> [<refspec>...]]",
20 "git fetch [<options>] <group>",
21 "git fetch --multiple [<options>] [(<repository> | <group>)...]",
22 "git fetch --all [<options>]",
23 NULL
24 };
25
26 enum {
27 TAGS_UNSET = 0,
28 TAGS_DEFAULT = 1,
29 TAGS_SET = 2
30 };
31
32 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
33 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
34 static int tags = TAGS_DEFAULT;
35 static const char *depth;
36 static const char *upload_pack;
37 static struct strbuf default_rla = STRBUF_INIT;
38 static struct transport *transport;
39 static const char *submodule_prefix = "";
40 static const char *recurse_submodules_default;
41
42 static int option_parse_recurse_submodules(const struct option *opt,
43 const char *arg, int unset)
44 {
45 if (unset) {
46 recurse_submodules = RECURSE_SUBMODULES_OFF;
47 } else {
48 if (arg)
49 recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
50 else
51 recurse_submodules = RECURSE_SUBMODULES_ON;
52 }
53 return 0;
54 }
55
56 static struct option builtin_fetch_options[] = {
57 OPT__VERBOSITY(&verbosity),
58 OPT_BOOLEAN(0, "all", &all,
59 "fetch from all remotes"),
60 OPT_BOOLEAN('a', "append", &append,
61 "append to .git/FETCH_HEAD instead of overwriting"),
62 OPT_STRING(0, "upload-pack", &upload_pack, "path",
63 "path to upload pack on remote end"),
64 OPT__FORCE(&force, "force overwrite of local branch"),
65 OPT_BOOLEAN('m', "multiple", &multiple,
66 "fetch from multiple remotes"),
67 OPT_SET_INT('t', "tags", &tags,
68 "fetch all tags and associated objects", TAGS_SET),
69 OPT_SET_INT('n', NULL, &tags,
70 "do not fetch all tags (--no-tags)", TAGS_UNSET),
71 OPT_BOOLEAN('p', "prune", &prune,
72 "prune remote-tracking branches no longer on remote"),
73 { OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
74 "control recursive fetching of submodules",
75 PARSE_OPT_OPTARG, option_parse_recurse_submodules },
76 OPT_BOOLEAN(0, "dry-run", &dry_run,
77 "dry run"),
78 OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
79 OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
80 "allow updating of HEAD ref"),
81 OPT_BOOL(0, "progress", &progress, "force progress reporting"),
82 OPT_STRING(0, "depth", &depth, "depth",
83 "deepen history of shallow clone"),
84 { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
85 "prepend this to submodule path output", PARSE_OPT_HIDDEN },
86 { OPTION_STRING, 0, "recurse-submodules-default",
87 &recurse_submodules_default, NULL,
88 "default mode for recursion", PARSE_OPT_HIDDEN },
89 OPT_END()
90 };
91
92 static void unlock_pack(void)
93 {
94 if (transport)
95 transport_unlock_pack(transport);
96 }
97
98 static void unlock_pack_on_signal(int signo)
99 {
100 unlock_pack();
101 sigchain_pop(signo);
102 raise(signo);
103 }
104
105 static void add_merge_config(struct ref **head,
106 const struct ref *remote_refs,
107 struct branch *branch,
108 struct ref ***tail)
109 {
110 int i;
111
112 for (i = 0; i < branch->merge_nr; i++) {
113 struct ref *rm, **old_tail = *tail;
114 struct refspec refspec;
115
116 for (rm = *head; rm; rm = rm->next) {
117 if (branch_merge_matches(branch, i, rm->name)) {
118 rm->merge = 1;
119 break;
120 }
121 }
122 if (rm)
123 continue;
124
125 /*
126 * Not fetched to a remote-tracking branch? We need to fetch
127 * it anyway to allow this branch's "branch.$name.merge"
128 * to be honored by 'git pull', but we do not have to
129 * fail if branch.$name.merge is misconfigured to point
130 * at a nonexisting branch. If we were indeed called by
131 * 'git pull', it will notice the misconfiguration because
132 * there is no entry in the resulting FETCH_HEAD marked
133 * for merging.
134 */
135 memset(&refspec, 0, sizeof(refspec));
136 refspec.src = branch->merge[i]->src;
137 get_fetch_map(remote_refs, &refspec, tail, 1);
138 for (rm = *old_tail; rm; rm = rm->next)
139 rm->merge = 1;
140 }
141 }
142
143 static void find_non_local_tags(struct transport *transport,
144 struct ref **head,
145 struct ref ***tail);
146
147 static struct ref *get_ref_map(struct transport *transport,
148 struct refspec *refs, int ref_count, int tags,
149 int *autotags)
150 {
151 int i;
152 struct ref *rm;
153 struct ref *ref_map = NULL;
154 struct ref **tail = &ref_map;
155
156 const struct ref *remote_refs = transport_get_remote_refs(transport);
157
158 if (ref_count || tags == TAGS_SET) {
159 for (i = 0; i < ref_count; i++) {
160 get_fetch_map(remote_refs, &refs[i], &tail, 0);
161 if (refs[i].dst && refs[i].dst[0])
162 *autotags = 1;
163 }
164 /* Merge everything on the command line, but not --tags */
165 for (rm = ref_map; rm; rm = rm->next)
166 rm->merge = 1;
167 if (tags == TAGS_SET)
168 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
169 } else {
170 /* Use the defaults */
171 struct remote *remote = transport->remote;
172 struct branch *branch = branch_get(NULL);
173 int has_merge = branch_has_merge_config(branch);
174 if (remote &&
175 (remote->fetch_refspec_nr ||
176 /* Note: has_merge implies non-NULL branch->remote_name */
177 (has_merge && !strcmp(branch->remote_name, remote->name)))) {
178 for (i = 0; i < remote->fetch_refspec_nr; i++) {
179 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
180 if (remote->fetch[i].dst &&
181 remote->fetch[i].dst[0])
182 *autotags = 1;
183 if (!i && !has_merge && ref_map &&
184 !remote->fetch[0].pattern)
185 ref_map->merge = 1;
186 }
187 /*
188 * if the remote we're fetching from is the same
189 * as given in branch.<name>.remote, we add the
190 * ref given in branch.<name>.merge, too.
191 *
192 * Note: has_merge implies non-NULL branch->remote_name
193 */
194 if (has_merge &&
195 !strcmp(branch->remote_name, remote->name))
196 add_merge_config(&ref_map, remote_refs, branch, &tail);
197 } else {
198 ref_map = get_remote_ref(remote_refs, "HEAD");
199 if (!ref_map)
200 die(_("Couldn't find remote ref HEAD"));
201 ref_map->merge = 1;
202 tail = &ref_map->next;
203 }
204 }
205 if (tags == TAGS_DEFAULT && *autotags)
206 find_non_local_tags(transport, &ref_map, &tail);
207 ref_remove_duplicates(ref_map);
208
209 return ref_map;
210 }
211
212 #define STORE_REF_ERROR_OTHER 1
213 #define STORE_REF_ERROR_DF_CONFLICT 2
214
215 static int s_update_ref(const char *action,
216 struct ref *ref,
217 int check_old)
218 {
219 char msg[1024];
220 char *rla = getenv("GIT_REFLOG_ACTION");
221 static struct ref_lock *lock;
222
223 if (dry_run)
224 return 0;
225 if (!rla)
226 rla = default_rla.buf;
227 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
228 lock = lock_any_ref_for_update(ref->name,
229 check_old ? ref->old_sha1 : NULL, 0);
230 if (!lock)
231 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
232 STORE_REF_ERROR_OTHER;
233 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
234 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
235 STORE_REF_ERROR_OTHER;
236 return 0;
237 }
238
239 #define REFCOL_WIDTH 10
240
241 static int update_local_ref(struct ref *ref,
242 const char *remote,
243 const struct ref *remote_ref,
244 struct strbuf *display)
245 {
246 struct commit *current = NULL, *updated;
247 enum object_type type;
248 struct branch *current_branch = branch_get(NULL);
249 const char *pretty_ref = prettify_refname(ref->name);
250
251 type = sha1_object_info(ref->new_sha1, NULL);
252 if (type < 0)
253 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
254
255 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
256 if (verbosity > 0)
257 strbuf_addf(display, "= %-*s %-*s -> %s",
258 TRANSPORT_SUMMARY_WIDTH,
259 _("[up to date]"), REFCOL_WIDTH,
260 remote, pretty_ref);
261 return 0;
262 }
263
264 if (current_branch &&
265 !strcmp(ref->name, current_branch->name) &&
266 !(update_head_ok || is_bare_repository()) &&
267 !is_null_sha1(ref->old_sha1)) {
268 /*
269 * If this is the head, and it's not okay to update
270 * the head, and the old value of the head isn't empty...
271 */
272 strbuf_addf(display,
273 _("! %-*s %-*s -> %s (can't fetch in current branch)"),
274 TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
275 REFCOL_WIDTH, remote, pretty_ref);
276 return 1;
277 }
278
279 if (!is_null_sha1(ref->old_sha1) &&
280 !prefixcmp(ref->name, "refs/tags/")) {
281 int r;
282 r = s_update_ref("updating tag", ref, 0);
283 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
284 r ? '!' : '-',
285 TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
286 REFCOL_WIDTH, remote, pretty_ref,
287 r ? _(" (unable to update local ref)") : "");
288 return r;
289 }
290
291 current = lookup_commit_reference_gently(ref->old_sha1, 1);
292 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
293 if (!current || !updated) {
294 const char *msg;
295 const char *what;
296 int r;
297 /*
298 * Nicely describe the new ref we're fetching.
299 * Base this on the remote's ref name, as it's
300 * more likely to follow a standard layout.
301 */
302 const char *name = remote_ref ? remote_ref->name : "";
303 if (!prefixcmp(name, "refs/tags/")) {
304 msg = "storing tag";
305 what = _("[new tag]");
306 } else if (!prefixcmp(name, "refs/heads/")) {
307 msg = "storing head";
308 what = _("[new branch]");
309 } else {
310 msg = "storing ref";
311 what = _("[new ref]");
312 }
313
314 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
315 (recurse_submodules != RECURSE_SUBMODULES_ON))
316 check_for_new_submodule_commits(ref->new_sha1);
317 r = s_update_ref(msg, ref, 0);
318 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
319 r ? '!' : '*',
320 TRANSPORT_SUMMARY_WIDTH, what,
321 REFCOL_WIDTH, remote, pretty_ref,
322 r ? _(" (unable to update local ref)") : "");
323 return r;
324 }
325
326 if (in_merge_bases(current, &updated, 1)) {
327 char quickref[83];
328 int r;
329 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
330 strcat(quickref, "..");
331 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
332 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
333 (recurse_submodules != RECURSE_SUBMODULES_ON))
334 check_for_new_submodule_commits(ref->new_sha1);
335 r = s_update_ref("fast-forward", ref, 1);
336 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
337 r ? '!' : ' ',
338 TRANSPORT_SUMMARY_WIDTH, quickref,
339 REFCOL_WIDTH, remote, pretty_ref,
340 r ? _(" (unable to update local ref)") : "");
341 return r;
342 } else if (force || ref->force) {
343 char quickref[84];
344 int r;
345 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
346 strcat(quickref, "...");
347 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
348 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
349 (recurse_submodules != RECURSE_SUBMODULES_ON))
350 check_for_new_submodule_commits(ref->new_sha1);
351 r = s_update_ref("forced-update", ref, 1);
352 strbuf_addf(display, "%c %-*s %-*s -> %s (%s)",
353 r ? '!' : '+',
354 TRANSPORT_SUMMARY_WIDTH, quickref,
355 REFCOL_WIDTH, remote, pretty_ref,
356 r ? _("unable to update local ref") : _("forced update"));
357 return r;
358 } else {
359 strbuf_addf(display, "! %-*s %-*s -> %s %s",
360 TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
361 REFCOL_WIDTH, remote, pretty_ref,
362 _("(non-fast-forward)"));
363 return 1;
364 }
365 }
366
367 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
368 {
369 struct ref **rm = cb_data;
370 struct ref *ref = *rm;
371
372 if (!ref)
373 return -1; /* end of the list */
374 *rm = ref->next;
375 hashcpy(sha1, ref->old_sha1);
376 return 0;
377 }
378
379 static int store_updated_refs(const char *raw_url, const char *remote_name,
380 struct ref *ref_map)
381 {
382 FILE *fp;
383 struct commit *commit;
384 int url_len, i, shown_url = 0, rc = 0;
385 struct strbuf note = STRBUF_INIT;
386 const char *what, *kind;
387 struct ref *rm;
388 char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
389 int want_merge;
390
391 fp = fopen(filename, "a");
392 if (!fp)
393 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
394
395 if (raw_url)
396 url = transport_anonymize_url(raw_url);
397 else
398 url = xstrdup("foreign");
399
400 rm = ref_map;
401 if (check_everything_connected(iterate_ref_map, 0, &rm)) {
402 rc = error(_("%s did not send all necessary objects\n"), url);
403 goto abort;
404 }
405
406 /*
407 * The first pass writes objects to be merged and then the
408 * second pass writes the rest, in order to allow using
409 * FETCH_HEAD as a refname to refer to the ref to be merged.
410 */
411 for (want_merge = 1; 0 <= want_merge; want_merge--) {
412 for (rm = ref_map; rm; rm = rm->next) {
413 struct ref *ref = NULL;
414
415 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
416 if (!commit)
417 rm->merge = 0;
418
419 if (rm->merge != want_merge)
420 continue;
421
422 if (rm->peer_ref) {
423 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
424 strcpy(ref->name, rm->peer_ref->name);
425 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
426 hashcpy(ref->new_sha1, rm->old_sha1);
427 ref->force = rm->peer_ref->force;
428 }
429
430
431 if (!strcmp(rm->name, "HEAD")) {
432 kind = "";
433 what = "";
434 }
435 else if (!prefixcmp(rm->name, "refs/heads/")) {
436 kind = "branch";
437 what = rm->name + 11;
438 }
439 else if (!prefixcmp(rm->name, "refs/tags/")) {
440 kind = "tag";
441 what = rm->name + 10;
442 }
443 else if (!prefixcmp(rm->name, "refs/remotes/")) {
444 kind = "remote-tracking branch";
445 what = rm->name + 13;
446 }
447 else {
448 kind = "";
449 what = rm->name;
450 }
451
452 url_len = strlen(url);
453 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
454 ;
455 url_len = i + 1;
456 if (4 < i && !strncmp(".git", url + i - 3, 4))
457 url_len = i - 3;
458
459 strbuf_reset(&note);
460 if (*what) {
461 if (*kind)
462 strbuf_addf(&note, "%s ", kind);
463 strbuf_addf(&note, "'%s' of ", what);
464 }
465 fprintf(fp, "%s\t%s\t%s",
466 sha1_to_hex(rm->old_sha1),
467 rm->merge ? "" : "not-for-merge",
468 note.buf);
469 for (i = 0; i < url_len; ++i)
470 if ('\n' == url[i])
471 fputs("\\n", fp);
472 else
473 fputc(url[i], fp);
474 fputc('\n', fp);
475
476 strbuf_reset(&note);
477 if (ref) {
478 rc |= update_local_ref(ref, what, rm, &note);
479 free(ref);
480 } else
481 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
482 TRANSPORT_SUMMARY_WIDTH,
483 *kind ? kind : "branch",
484 REFCOL_WIDTH,
485 *what ? what : "HEAD");
486 if (note.len) {
487 if (verbosity >= 0 && !shown_url) {
488 fprintf(stderr, _("From %.*s\n"),
489 url_len, url);
490 shown_url = 1;
491 }
492 if (verbosity >= 0)
493 fprintf(stderr, " %s\n", note.buf);
494 }
495 }
496 }
497
498 if (rc & STORE_REF_ERROR_DF_CONFLICT)
499 error(_("some local refs could not be updated; try running\n"
500 " 'git remote prune %s' to remove any old, conflicting "
501 "branches"), remote_name);
502
503 abort:
504 strbuf_release(&note);
505 free(url);
506 fclose(fp);
507 return rc;
508 }
509
510 /*
511 * We would want to bypass the object transfer altogether if
512 * everything we are going to fetch already exists and is connected
513 * locally.
514 */
515 static int quickfetch(struct ref *ref_map)
516 {
517 struct ref *rm = ref_map;
518
519 /*
520 * If we are deepening a shallow clone we already have these
521 * objects reachable. Running rev-list here will return with
522 * a good (0) exit status and we'll bypass the fetch that we
523 * really need to perform. Claiming failure now will ensure
524 * we perform the network exchange to deepen our history.
525 */
526 if (depth)
527 return -1;
528 return check_everything_connected(iterate_ref_map, 1, &rm);
529 }
530
531 static int fetch_refs(struct transport *transport, struct ref *ref_map)
532 {
533 int ret = quickfetch(ref_map);
534 if (ret)
535 ret = transport_fetch_refs(transport, ref_map);
536 if (!ret)
537 ret |= store_updated_refs(transport->url,
538 transport->remote->name,
539 ref_map);
540 transport_unlock_pack(transport);
541 return ret;
542 }
543
544 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
545 {
546 int result = 0;
547 struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
548 const char *dangling_msg = dry_run
549 ? _(" (%s will become dangling)")
550 : _(" (%s has become dangling)");
551
552 for (ref = stale_refs; ref; ref = ref->next) {
553 if (!dry_run)
554 result |= delete_ref(ref->name, NULL, 0);
555 if (verbosity >= 0) {
556 fprintf(stderr, " x %-*s %-*s -> %s\n",
557 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
558 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
559 warn_dangling_symref(stderr, dangling_msg, ref->name);
560 }
561 }
562 free_refs(stale_refs);
563 return result;
564 }
565
566 static int add_existing(const char *refname, const unsigned char *sha1,
567 int flag, void *cbdata)
568 {
569 struct string_list *list = (struct string_list *)cbdata;
570 struct string_list_item *item = string_list_insert(list, refname);
571 item->util = (void *)sha1;
572 return 0;
573 }
574
575 static int will_fetch(struct ref **head, const unsigned char *sha1)
576 {
577 struct ref *rm = *head;
578 while (rm) {
579 if (!hashcmp(rm->old_sha1, sha1))
580 return 1;
581 rm = rm->next;
582 }
583 return 0;
584 }
585
586 static void find_non_local_tags(struct transport *transport,
587 struct ref **head,
588 struct ref ***tail)
589 {
590 struct string_list existing_refs = STRING_LIST_INIT_NODUP;
591 struct string_list remote_refs = STRING_LIST_INIT_NODUP;
592 const struct ref *ref;
593 struct string_list_item *item = NULL;
594
595 for_each_ref(add_existing, &existing_refs);
596 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
597 if (prefixcmp(ref->name, "refs/tags/"))
598 continue;
599
600 /*
601 * The peeled ref always follows the matching base
602 * ref, so if we see a peeled ref that we don't want
603 * to fetch then we can mark the ref entry in the list
604 * as one to ignore by setting util to NULL.
605 */
606 if (!suffixcmp(ref->name, "^{}")) {
607 if (item && !has_sha1_file(ref->old_sha1) &&
608 !will_fetch(head, ref->old_sha1) &&
609 !has_sha1_file(item->util) &&
610 !will_fetch(head, item->util))
611 item->util = NULL;
612 item = NULL;
613 continue;
614 }
615
616 /*
617 * If item is non-NULL here, then we previously saw a
618 * ref not followed by a peeled reference, so we need
619 * to check if it is a lightweight tag that we want to
620 * fetch.
621 */
622 if (item && !has_sha1_file(item->util) &&
623 !will_fetch(head, item->util))
624 item->util = NULL;
625
626 item = NULL;
627
628 /* skip duplicates and refs that we already have */
629 if (string_list_has_string(&remote_refs, ref->name) ||
630 string_list_has_string(&existing_refs, ref->name))
631 continue;
632
633 item = string_list_insert(&remote_refs, ref->name);
634 item->util = (void *)ref->old_sha1;
635 }
636 string_list_clear(&existing_refs, 0);
637
638 /*
639 * We may have a final lightweight tag that needs to be
640 * checked to see if it needs fetching.
641 */
642 if (item && !has_sha1_file(item->util) &&
643 !will_fetch(head, item->util))
644 item->util = NULL;
645
646 /*
647 * For all the tags in the remote_refs string list,
648 * add them to the list of refs to be fetched
649 */
650 for_each_string_list_item(item, &remote_refs) {
651 /* Unless we have already decided to ignore this item... */
652 if (item->util)
653 {
654 struct ref *rm = alloc_ref(item->string);
655 rm->peer_ref = alloc_ref(item->string);
656 hashcpy(rm->old_sha1, item->util);
657 **tail = rm;
658 *tail = &rm->next;
659 }
660 }
661
662 string_list_clear(&remote_refs, 0);
663 }
664
665 static void check_not_current_branch(struct ref *ref_map)
666 {
667 struct branch *current_branch = branch_get(NULL);
668
669 if (is_bare_repository() || !current_branch)
670 return;
671
672 for (; ref_map; ref_map = ref_map->next)
673 if (ref_map->peer_ref && !strcmp(current_branch->refname,
674 ref_map->peer_ref->name))
675 die(_("Refusing to fetch into current branch %s "
676 "of non-bare repository"), current_branch->refname);
677 }
678
679 static int truncate_fetch_head(void)
680 {
681 char *filename = git_path("FETCH_HEAD");
682 FILE *fp = fopen(filename, "w");
683
684 if (!fp)
685 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
686 fclose(fp);
687 return 0;
688 }
689
690 static int do_fetch(struct transport *transport,
691 struct refspec *refs, int ref_count)
692 {
693 struct string_list existing_refs = STRING_LIST_INIT_NODUP;
694 struct string_list_item *peer_item = NULL;
695 struct ref *ref_map;
696 struct ref *rm;
697 int autotags = (transport->remote->fetch_tags == 1);
698
699 for_each_ref(add_existing, &existing_refs);
700
701 if (tags == TAGS_DEFAULT) {
702 if (transport->remote->fetch_tags == 2)
703 tags = TAGS_SET;
704 if (transport->remote->fetch_tags == -1)
705 tags = TAGS_UNSET;
706 }
707
708 if (!transport->get_refs_list || !transport->fetch)
709 die(_("Don't know how to fetch from %s"), transport->url);
710
711 /* if not appending, truncate FETCH_HEAD */
712 if (!append && !dry_run) {
713 int errcode = truncate_fetch_head();
714 if (errcode)
715 return errcode;
716 }
717
718 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
719 if (!update_head_ok)
720 check_not_current_branch(ref_map);
721
722 for (rm = ref_map; rm; rm = rm->next) {
723 if (rm->peer_ref) {
724 peer_item = string_list_lookup(&existing_refs,
725 rm->peer_ref->name);
726 if (peer_item)
727 hashcpy(rm->peer_ref->old_sha1,
728 peer_item->util);
729 }
730 }
731
732 if (tags == TAGS_DEFAULT && autotags)
733 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
734 if (fetch_refs(transport, ref_map)) {
735 free_refs(ref_map);
736 return 1;
737 }
738 if (prune) {
739 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
740 if (tags == TAGS_SET) {
741 const char *tags_str = "refs/tags/*:refs/tags/*";
742 struct refspec *tags_refspec, *refspec;
743
744 /* Copy the refspec and add the tags to it */
745 refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
746 tags_refspec = parse_fetch_refspec(1, &tags_str);
747 memcpy(refspec, refs, ref_count * sizeof(struct refspec));
748 memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
749 ref_count++;
750
751 prune_refs(refspec, ref_count, ref_map);
752
753 ref_count--;
754 /* The rest of the strings belong to fetch_one */
755 free_refspec(1, tags_refspec);
756 free(refspec);
757 } else if (ref_count) {
758 prune_refs(refs, ref_count, ref_map);
759 } else {
760 prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
761 }
762 }
763 free_refs(ref_map);
764
765 /* if neither --no-tags nor --tags was specified, do automated tag
766 * following ... */
767 if (tags == TAGS_DEFAULT && autotags) {
768 struct ref **tail = &ref_map;
769 ref_map = NULL;
770 find_non_local_tags(transport, &ref_map, &tail);
771 if (ref_map) {
772 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
773 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
774 fetch_refs(transport, ref_map);
775 }
776 free_refs(ref_map);
777 }
778
779 return 0;
780 }
781
782 static void set_option(const char *name, const char *value)
783 {
784 int r = transport_set_option(transport, name, value);
785 if (r < 0)
786 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
787 name, value, transport->url);
788 if (r > 0)
789 warning(_("Option \"%s\" is ignored for %s\n"),
790 name, transport->url);
791 }
792
793 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
794 {
795 struct string_list *list = priv;
796 if (!remote->skip_default_update)
797 string_list_append(list, remote->name);
798 return 0;
799 }
800
801 struct remote_group_data {
802 const char *name;
803 struct string_list *list;
804 };
805
806 static int get_remote_group(const char *key, const char *value, void *priv)
807 {
808 struct remote_group_data *g = priv;
809
810 if (!prefixcmp(key, "remotes.") &&
811 !strcmp(key + 8, g->name)) {
812 /* split list by white space */
813 int space = strcspn(value, " \t\n");
814 while (*value) {
815 if (space > 1) {
816 string_list_append(g->list,
817 xstrndup(value, space));
818 }
819 value += space + (value[space] != '\0');
820 space = strcspn(value, " \t\n");
821 }
822 }
823
824 return 0;
825 }
826
827 static int add_remote_or_group(const char *name, struct string_list *list)
828 {
829 int prev_nr = list->nr;
830 struct remote_group_data g;
831 g.name = name; g.list = list;
832
833 git_config(get_remote_group, &g);
834 if (list->nr == prev_nr) {
835 struct remote *remote;
836 if (!remote_is_configured(name))
837 return 0;
838 remote = remote_get(name);
839 string_list_append(list, remote->name);
840 }
841 return 1;
842 }
843
844 static void add_options_to_argv(int *argc, const char **argv)
845 {
846 if (dry_run)
847 argv[(*argc)++] = "--dry-run";
848 if (prune)
849 argv[(*argc)++] = "--prune";
850 if (update_head_ok)
851 argv[(*argc)++] = "--update-head-ok";
852 if (force)
853 argv[(*argc)++] = "--force";
854 if (keep)
855 argv[(*argc)++] = "--keep";
856 if (recurse_submodules == RECURSE_SUBMODULES_ON)
857 argv[(*argc)++] = "--recurse-submodules";
858 else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
859 argv[(*argc)++] = "--recurse-submodules=on-demand";
860 if (verbosity >= 2)
861 argv[(*argc)++] = "-v";
862 if (verbosity >= 1)
863 argv[(*argc)++] = "-v";
864 else if (verbosity < 0)
865 argv[(*argc)++] = "-q";
866
867 }
868
869 static int fetch_multiple(struct string_list *list)
870 {
871 int i, result = 0;
872 const char *argv[12] = { "fetch", "--append" };
873 int argc = 2;
874
875 add_options_to_argv(&argc, argv);
876
877 if (!append && !dry_run) {
878 int errcode = truncate_fetch_head();
879 if (errcode)
880 return errcode;
881 }
882
883 for (i = 0; i < list->nr; i++) {
884 const char *name = list->items[i].string;
885 argv[argc] = name;
886 argv[argc + 1] = NULL;
887 if (verbosity >= 0)
888 printf(_("Fetching %s\n"), name);
889 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
890 error(_("Could not fetch %s"), name);
891 result = 1;
892 }
893 }
894
895 return result;
896 }
897
898 static int fetch_one(struct remote *remote, int argc, const char **argv)
899 {
900 int i;
901 static const char **refs = NULL;
902 struct refspec *refspec;
903 int ref_nr = 0;
904 int exit_code;
905
906 if (!remote)
907 die(_("No remote repository specified. Please, specify either a URL or a\n"
908 "remote name from which new revisions should be fetched."));
909
910 transport = transport_get(remote, NULL);
911 transport_set_verbosity(transport, verbosity, progress);
912 if (upload_pack)
913 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
914 if (keep)
915 set_option(TRANS_OPT_KEEP, "yes");
916 if (depth)
917 set_option(TRANS_OPT_DEPTH, depth);
918
919 if (argc > 0) {
920 int j = 0;
921 refs = xcalloc(argc + 1, sizeof(const char *));
922 for (i = 0; i < argc; i++) {
923 if (!strcmp(argv[i], "tag")) {
924 char *ref;
925 i++;
926 if (i >= argc)
927 die(_("You need to specify a tag name."));
928 ref = xmalloc(strlen(argv[i]) * 2 + 22);
929 strcpy(ref, "refs/tags/");
930 strcat(ref, argv[i]);
931 strcat(ref, ":refs/tags/");
932 strcat(ref, argv[i]);
933 refs[j++] = ref;
934 } else
935 refs[j++] = argv[i];
936 }
937 refs[j] = NULL;
938 ref_nr = j;
939 }
940
941 sigchain_push_common(unlock_pack_on_signal);
942 atexit(unlock_pack);
943 refspec = parse_fetch_refspec(ref_nr, refs);
944 exit_code = do_fetch(transport, refspec, ref_nr);
945 free_refspec(ref_nr, refspec);
946 transport_disconnect(transport);
947 transport = NULL;
948 return exit_code;
949 }
950
951 int cmd_fetch(int argc, const char **argv, const char *prefix)
952 {
953 int i;
954 struct string_list list = STRING_LIST_INIT_NODUP;
955 struct remote *remote;
956 int result = 0;
957
958 packet_trace_identity("fetch");
959
960 /* Record the command line for the reflog */
961 strbuf_addstr(&default_rla, "fetch");
962 for (i = 1; i < argc; i++)
963 strbuf_addf(&default_rla, " %s", argv[i]);
964
965 argc = parse_options(argc, argv, prefix,
966 builtin_fetch_options, builtin_fetch_usage, 0);
967
968 if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
969 if (recurse_submodules_default) {
970 int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
971 set_config_fetch_recurse_submodules(arg);
972 }
973 gitmodules_config();
974 git_config(submodule_config, NULL);
975 }
976
977 if (all) {
978 if (argc == 1)
979 die(_("fetch --all does not take a repository argument"));
980 else if (argc > 1)
981 die(_("fetch --all does not make sense with refspecs"));
982 (void) for_each_remote(get_one_remote_for_fetch, &list);
983 result = fetch_multiple(&list);
984 } else if (argc == 0) {
985 /* No arguments -- use default remote */
986 remote = remote_get(NULL);
987 result = fetch_one(remote, argc, argv);
988 } else if (multiple) {
989 /* All arguments are assumed to be remotes or groups */
990 for (i = 0; i < argc; i++)
991 if (!add_remote_or_group(argv[i], &list))
992 die(_("No such remote or remote group: %s"), argv[i]);
993 result = fetch_multiple(&list);
994 } else {
995 /* Single remote or group */
996 (void) add_remote_or_group(argv[0], &list);
997 if (list.nr > 1) {
998 /* More than one remote */
999 if (argc > 1)
1000 die(_("Fetching a group and specifying refspecs does not make sense"));
1001 result = fetch_multiple(&list);
1002 } else {
1003 /* Zero or one remotes */
1004 remote = remote_get(argv[0]);
1005 result = fetch_one(remote, argc-1, argv+1);
1006 }
1007 }
1008
1009 if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1010 const char *options[10];
1011 int num_options = 0;
1012 add_options_to_argv(&num_options, options);
1013 result = fetch_populated_submodules(num_options, options,
1014 submodule_prefix,
1015 recurse_submodules,
1016 verbosity < 0);
1017 }
1018
1019 /* All names were strdup()ed or strndup()ed */
1020 list.strdup_strings = 1;
1021 string_list_clear(&list, 0);
1022
1023 return result;
1024 }