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#include "argv-array.h"
18
19static const char * const builtin_fetch_usage[] = {
20 N_("git fetch [<options>] [<repository> [<refspec>...]]"),
21 N_("git fetch [<options>] <group>"),
22 N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
23 N_("git fetch --all [<options>]"),
24 NULL
25};
26
27enum {
28 TAGS_UNSET = 0,
29 TAGS_DEFAULT = 1,
30 TAGS_SET = 2
31};
32
33static int fetch_prune_config = -1; /* unspecified */
34static int prune = -1; /* unspecified */
35#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
36
37static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
38static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
39static int tags = TAGS_DEFAULT, unshallow;
40static const char *depth;
41static const char *upload_pack;
42static struct strbuf default_rla = STRBUF_INIT;
43static struct transport *transport;
44static const char *submodule_prefix = "";
45static const char *recurse_submodules_default;
46
47static int option_parse_recurse_submodules(const struct option *opt,
48 const char *arg, int unset)
49{
50 if (unset) {
51 recurse_submodules = RECURSE_SUBMODULES_OFF;
52 } else {
53 if (arg)
54 recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
55 else
56 recurse_submodules = RECURSE_SUBMODULES_ON;
57 }
58 return 0;
59}
60
61static int git_fetch_config(const char *k, const char *v, void *cb)
62{
63 if (!strcmp(k, "fetch.prune")) {
64 fetch_prune_config = git_config_bool(k, v);
65 return 0;
66 }
67 return 0;
68}
69
70static struct option builtin_fetch_options[] = {
71 OPT__VERBOSITY(&verbosity),
72 OPT_BOOLEAN(0, "all", &all,
73 N_("fetch from all remotes")),
74 OPT_BOOLEAN('a', "append", &append,
75 N_("append to .git/FETCH_HEAD instead of overwriting")),
76 OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
77 N_("path to upload pack on remote end")),
78 OPT__FORCE(&force, N_("force overwrite of local branch")),
79 OPT_BOOLEAN('m', "multiple", &multiple,
80 N_("fetch from multiple remotes")),
81 OPT_SET_INT('t', "tags", &tags,
82 N_("fetch all tags and associated objects"), TAGS_SET),
83 OPT_SET_INT('n', NULL, &tags,
84 N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
85 OPT_BOOL('p', "prune", &prune,
86 N_("prune remote-tracking branches no longer on remote")),
87 { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
88 N_("control recursive fetching of submodules"),
89 PARSE_OPT_OPTARG, option_parse_recurse_submodules },
90 OPT_BOOLEAN(0, "dry-run", &dry_run,
91 N_("dry run")),
92 OPT_BOOLEAN('k', "keep", &keep, N_("keep downloaded pack")),
93 OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
94 N_("allow updating of HEAD ref")),
95 OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
96 OPT_STRING(0, "depth", &depth, N_("depth"),
97 N_("deepen history of shallow clone")),
98 { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
99 N_("convert to a complete repository"),
100 PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
101 { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
102 N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
103 { OPTION_STRING, 0, "recurse-submodules-default",
104 &recurse_submodules_default, NULL,
105 N_("default mode for recursion"), PARSE_OPT_HIDDEN },
106 OPT_END()
107};
108
109static void unlock_pack(void)
110{
111 if (transport)
112 transport_unlock_pack(transport);
113}
114
115static void unlock_pack_on_signal(int signo)
116{
117 unlock_pack();
118 sigchain_pop(signo);
119 raise(signo);
120}
121
122static void add_merge_config(struct ref **head,
123 const struct ref *remote_refs,
124 struct branch *branch,
125 struct ref ***tail)
126{
127 int i;
128
129 for (i = 0; i < branch->merge_nr; i++) {
130 struct ref *rm, **old_tail = *tail;
131 struct refspec refspec;
132
133 for (rm = *head; rm; rm = rm->next) {
134 if (branch_merge_matches(branch, i, rm->name)) {
135 rm->merge = 1;
136 break;
137 }
138 }
139 if (rm)
140 continue;
141
142 /*
143 * Not fetched to a remote-tracking branch? We need to fetch
144 * it anyway to allow this branch's "branch.$name.merge"
145 * to be honored by 'git pull', but we do not have to
146 * fail if branch.$name.merge is misconfigured to point
147 * at a nonexisting branch. If we were indeed called by
148 * 'git pull', it will notice the misconfiguration because
149 * there is no entry in the resulting FETCH_HEAD marked
150 * for merging.
151 */
152 memset(&refspec, 0, sizeof(refspec));
153 refspec.src = branch->merge[i]->src;
154 get_fetch_map(remote_refs, &refspec, tail, 1);
155 for (rm = *old_tail; rm; rm = rm->next)
156 rm->merge = 1;
157 }
158}
159
160static void find_non_local_tags(struct transport *transport,
161 struct ref **head,
162 struct ref ***tail);
163
164static struct ref *get_ref_map(struct transport *transport,
165 struct refspec *refs, int ref_count, int tags,
166 int *autotags)
167{
168 int i;
169 struct ref *rm;
170 struct ref *ref_map = NULL;
171 struct ref **tail = &ref_map;
172
173 const struct ref *remote_refs = transport_get_remote_refs(transport);
174
175 if (ref_count || tags == TAGS_SET) {
176 for (i = 0; i < ref_count; i++) {
177 get_fetch_map(remote_refs, &refs[i], &tail, 0);
178 if (refs[i].dst && refs[i].dst[0])
179 *autotags = 1;
180 }
181 /* Merge everything on the command line, but not --tags */
182 for (rm = ref_map; rm; rm = rm->next)
183 rm->merge = 1;
184 if (tags == TAGS_SET)
185 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
186 } else {
187 /* Use the defaults */
188 struct remote *remote = transport->remote;
189 struct branch *branch = branch_get(NULL);
190 int has_merge = branch_has_merge_config(branch);
191 if (remote &&
192 (remote->fetch_refspec_nr ||
193 /* Note: has_merge implies non-NULL branch->remote_name */
194 (has_merge && !strcmp(branch->remote_name, remote->name)))) {
195 for (i = 0; i < remote->fetch_refspec_nr; i++) {
196 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
197 if (remote->fetch[i].dst &&
198 remote->fetch[i].dst[0])
199 *autotags = 1;
200 if (!i && !has_merge && ref_map &&
201 !remote->fetch[0].pattern)
202 ref_map->merge = 1;
203 }
204 /*
205 * if the remote we're fetching from is the same
206 * as given in branch.<name>.remote, we add the
207 * ref given in branch.<name>.merge, too.
208 *
209 * Note: has_merge implies non-NULL branch->remote_name
210 */
211 if (has_merge &&
212 !strcmp(branch->remote_name, remote->name))
213 add_merge_config(&ref_map, remote_refs, branch, &tail);
214 } else {
215 ref_map = get_remote_ref(remote_refs, "HEAD");
216 if (!ref_map)
217 die(_("Couldn't find remote ref HEAD"));
218 ref_map->merge = 1;
219 tail = &ref_map->next;
220 }
221 }
222 if (tags == TAGS_DEFAULT && *autotags)
223 find_non_local_tags(transport, &ref_map, &tail);
224 ref_remove_duplicates(ref_map);
225
226 return ref_map;
227}
228
229#define STORE_REF_ERROR_OTHER 1
230#define STORE_REF_ERROR_DF_CONFLICT 2
231
232static int s_update_ref(const char *action,
233 struct ref *ref,
234 int check_old)
235{
236 char msg[1024];
237 char *rla = getenv("GIT_REFLOG_ACTION");
238 static struct ref_lock *lock;
239
240 if (dry_run)
241 return 0;
242 if (!rla)
243 rla = default_rla.buf;
244 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
245 lock = lock_any_ref_for_update(ref->name,
246 check_old ? ref->old_sha1 : NULL, 0);
247 if (!lock)
248 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
249 STORE_REF_ERROR_OTHER;
250 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
251 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
252 STORE_REF_ERROR_OTHER;
253 return 0;
254}
255
256#define REFCOL_WIDTH 10
257
258static int update_local_ref(struct ref *ref,
259 const char *remote,
260 const struct ref *remote_ref,
261 struct strbuf *display)
262{
263 struct commit *current = NULL, *updated;
264 enum object_type type;
265 struct branch *current_branch = branch_get(NULL);
266 const char *pretty_ref = prettify_refname(ref->name);
267
268 type = sha1_object_info(ref->new_sha1, NULL);
269 if (type < 0)
270 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
271
272 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
273 if (verbosity > 0)
274 strbuf_addf(display, "= %-*s %-*s -> %s",
275 TRANSPORT_SUMMARY(_("[up to date]")),
276 REFCOL_WIDTH, remote, pretty_ref);
277 return 0;
278 }
279
280 if (current_branch &&
281 !strcmp(ref->name, current_branch->name) &&
282 !(update_head_ok || is_bare_repository()) &&
283 !is_null_sha1(ref->old_sha1)) {
284 /*
285 * If this is the head, and it's not okay to update
286 * the head, and the old value of the head isn't empty...
287 */
288 strbuf_addf(display,
289 _("! %-*s %-*s -> %s (can't fetch in current branch)"),
290 TRANSPORT_SUMMARY(_("[rejected]")),
291 REFCOL_WIDTH, remote, pretty_ref);
292 return 1;
293 }
294
295 if (!is_null_sha1(ref->old_sha1) &&
296 !prefixcmp(ref->name, "refs/tags/")) {
297 int r;
298 r = s_update_ref("updating tag", ref, 0);
299 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
300 r ? '!' : '-',
301 TRANSPORT_SUMMARY(_("[tag update]")),
302 REFCOL_WIDTH, remote, pretty_ref,
303 r ? _(" (unable to update local ref)") : "");
304 return r;
305 }
306
307 current = lookup_commit_reference_gently(ref->old_sha1, 1);
308 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
309 if (!current || !updated) {
310 const char *msg;
311 const char *what;
312 int r;
313 /*
314 * Nicely describe the new ref we're fetching.
315 * Base this on the remote's ref name, as it's
316 * more likely to follow a standard layout.
317 */
318 const char *name = remote_ref ? remote_ref->name : "";
319 if (!prefixcmp(name, "refs/tags/")) {
320 msg = "storing tag";
321 what = _("[new tag]");
322 } else if (!prefixcmp(name, "refs/heads/")) {
323 msg = "storing head";
324 what = _("[new branch]");
325 } else {
326 msg = "storing ref";
327 what = _("[new ref]");
328 }
329
330 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
331 (recurse_submodules != RECURSE_SUBMODULES_ON))
332 check_for_new_submodule_commits(ref->new_sha1);
333 r = s_update_ref(msg, ref, 0);
334 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
335 r ? '!' : '*',
336 TRANSPORT_SUMMARY(what),
337 REFCOL_WIDTH, remote, pretty_ref,
338 r ? _(" (unable to update local ref)") : "");
339 return r;
340 }
341
342 if (in_merge_bases(current, updated)) {
343 char quickref[83];
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("fast-forward", 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)") : "");
357 return r;
358 } else if (force || ref->force) {
359 char quickref[84];
360 int r;
361 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
362 strcat(quickref, "...");
363 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
364 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
365 (recurse_submodules != RECURSE_SUBMODULES_ON))
366 check_for_new_submodule_commits(ref->new_sha1);
367 r = s_update_ref("forced-update", ref, 1);
368 strbuf_addf(display, "%c %-*s %-*s -> %s (%s)",
369 r ? '!' : '+',
370 TRANSPORT_SUMMARY_WIDTH, quickref,
371 REFCOL_WIDTH, remote, pretty_ref,
372 r ? _("unable to update local ref") : _("forced update"));
373 return r;
374 } else {
375 strbuf_addf(display, "! %-*s %-*s -> %s %s",
376 TRANSPORT_SUMMARY(_("[rejected]")),
377 REFCOL_WIDTH, remote, pretty_ref,
378 _("(non-fast-forward)"));
379 return 1;
380 }
381}
382
383static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
384{
385 struct ref **rm = cb_data;
386 struct ref *ref = *rm;
387
388 if (!ref)
389 return -1; /* end of the list */
390 *rm = ref->next;
391 hashcpy(sha1, ref->old_sha1);
392 return 0;
393}
394
395static int store_updated_refs(const char *raw_url, const char *remote_name,
396 struct ref *ref_map)
397{
398 FILE *fp;
399 struct commit *commit;
400 int url_len, i, shown_url = 0, rc = 0;
401 struct strbuf note = STRBUF_INIT;
402 const char *what, *kind;
403 struct ref *rm;
404 char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
405 int want_merge;
406
407 fp = fopen(filename, "a");
408 if (!fp)
409 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
410
411 if (raw_url)
412 url = transport_anonymize_url(raw_url);
413 else
414 url = xstrdup("foreign");
415
416 rm = ref_map;
417 if (check_everything_connected(iterate_ref_map, 0, &rm)) {
418 rc = error(_("%s did not send all necessary objects\n"), url);
419 goto abort;
420 }
421
422 /*
423 * The first pass writes objects to be merged and then the
424 * second pass writes the rest, in order to allow using
425 * FETCH_HEAD as a refname to refer to the ref to be merged.
426 */
427 for (want_merge = 1; 0 <= want_merge; want_merge--) {
428 for (rm = ref_map; rm; rm = rm->next) {
429 struct ref *ref = NULL;
430
431 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
432 if (!commit)
433 rm->merge = 0;
434
435 if (rm->merge != want_merge)
436 continue;
437
438 if (rm->peer_ref) {
439 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
440 strcpy(ref->name, rm->peer_ref->name);
441 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
442 hashcpy(ref->new_sha1, rm->old_sha1);
443 ref->force = rm->peer_ref->force;
444 }
445
446
447 if (!strcmp(rm->name, "HEAD")) {
448 kind = "";
449 what = "";
450 }
451 else if (!prefixcmp(rm->name, "refs/heads/")) {
452 kind = "branch";
453 what = rm->name + 11;
454 }
455 else if (!prefixcmp(rm->name, "refs/tags/")) {
456 kind = "tag";
457 what = rm->name + 10;
458 }
459 else if (!prefixcmp(rm->name, "refs/remotes/")) {
460 kind = "remote-tracking branch";
461 what = rm->name + 13;
462 }
463 else {
464 kind = "";
465 what = rm->name;
466 }
467
468 url_len = strlen(url);
469 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
470 ;
471 url_len = i + 1;
472 if (4 < i && !strncmp(".git", url + i - 3, 4))
473 url_len = i - 3;
474
475 strbuf_reset(¬e);
476 if (*what) {
477 if (*kind)
478 strbuf_addf(¬e, "%s ", kind);
479 strbuf_addf(¬e, "'%s' of ", what);
480 }
481 fprintf(fp, "%s\t%s\t%s",
482 sha1_to_hex(rm->old_sha1),
483 rm->merge ? "" : "not-for-merge",
484 note.buf);
485 for (i = 0; i < url_len; ++i)
486 if ('\n' == url[i])
487 fputs("\\n", fp);
488 else
489 fputc(url[i], fp);
490 fputc('\n', fp);
491
492 strbuf_reset(¬e);
493 if (ref) {
494 rc |= update_local_ref(ref, what, rm, ¬e);
495 free(ref);
496 } else
497 strbuf_addf(¬e, "* %-*s %-*s -> FETCH_HEAD",
498 TRANSPORT_SUMMARY_WIDTH,
499 *kind ? kind : "branch",
500 REFCOL_WIDTH,
501 *what ? what : "HEAD");
502 if (note.len) {
503 if (verbosity >= 0 && !shown_url) {
504 fprintf(stderr, _("From %.*s\n"),
505 url_len, url);
506 shown_url = 1;
507 }
508 if (verbosity >= 0)
509 fprintf(stderr, " %s\n", note.buf);
510 }
511 }
512 }
513
514 if (rc & STORE_REF_ERROR_DF_CONFLICT)
515 error(_("some local refs could not be updated; try running\n"
516 " 'git remote prune %s' to remove any old, conflicting "
517 "branches"), remote_name);
518
519 abort:
520 strbuf_release(¬e);
521 free(url);
522 fclose(fp);
523 return rc;
524}
525
526/*
527 * We would want to bypass the object transfer altogether if
528 * everything we are going to fetch already exists and is connected
529 * locally.
530 */
531static int quickfetch(struct ref *ref_map)
532{
533 struct ref *rm = ref_map;
534
535 /*
536 * If we are deepening a shallow clone we already have these
537 * objects reachable. Running rev-list here will return with
538 * a good (0) exit status and we'll bypass the fetch that we
539 * really need to perform. Claiming failure now will ensure
540 * we perform the network exchange to deepen our history.
541 */
542 if (depth)
543 return -1;
544 return check_everything_connected(iterate_ref_map, 1, &rm);
545}
546
547static int fetch_refs(struct transport *transport, struct ref *ref_map)
548{
549 int ret = quickfetch(ref_map);
550 if (ret)
551 ret = transport_fetch_refs(transport, ref_map);
552 if (!ret)
553 ret |= store_updated_refs(transport->url,
554 transport->remote->name,
555 ref_map);
556 transport_unlock_pack(transport);
557 return ret;
558}
559
560static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
561{
562 int result = 0;
563 struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
564 const char *dangling_msg = dry_run
565 ? _(" (%s will become dangling)")
566 : _(" (%s has become dangling)");
567
568 for (ref = stale_refs; ref; ref = ref->next) {
569 if (!dry_run)
570 result |= delete_ref(ref->name, NULL, 0);
571 if (verbosity >= 0) {
572 fprintf(stderr, " x %-*s %-*s -> %s\n",
573 TRANSPORT_SUMMARY(_("[deleted]")),
574 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
575 warn_dangling_symref(stderr, dangling_msg, ref->name);
576 }
577 }
578 free_refs(stale_refs);
579 return result;
580}
581
582static int add_existing(const char *refname, const unsigned char *sha1,
583 int flag, void *cbdata)
584{
585 struct string_list *list = (struct string_list *)cbdata;
586 struct string_list_item *item = string_list_insert(list, refname);
587 item->util = (void *)sha1;
588 return 0;
589}
590
591static int will_fetch(struct ref **head, const unsigned char *sha1)
592{
593 struct ref *rm = *head;
594 while (rm) {
595 if (!hashcmp(rm->old_sha1, sha1))
596 return 1;
597 rm = rm->next;
598 }
599 return 0;
600}
601
602static void find_non_local_tags(struct transport *transport,
603 struct ref **head,
604 struct ref ***tail)
605{
606 struct string_list existing_refs = STRING_LIST_INIT_NODUP;
607 struct string_list remote_refs = STRING_LIST_INIT_NODUP;
608 const struct ref *ref;
609 struct string_list_item *item = NULL;
610
611 for_each_ref(add_existing, &existing_refs);
612 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
613 if (prefixcmp(ref->name, "refs/tags/"))
614 continue;
615
616 /*
617 * The peeled ref always follows the matching base
618 * ref, so if we see a peeled ref that we don't want
619 * to fetch then we can mark the ref entry in the list
620 * as one to ignore by setting util to NULL.
621 */
622 if (!suffixcmp(ref->name, "^{}")) {
623 if (item && !has_sha1_file(ref->old_sha1) &&
624 !will_fetch(head, ref->old_sha1) &&
625 !has_sha1_file(item->util) &&
626 !will_fetch(head, item->util))
627 item->util = NULL;
628 item = NULL;
629 continue;
630 }
631
632 /*
633 * If item is non-NULL here, then we previously saw a
634 * ref not followed by a peeled reference, so we need
635 * to check if it is a lightweight tag that we want to
636 * fetch.
637 */
638 if (item && !has_sha1_file(item->util) &&
639 !will_fetch(head, item->util))
640 item->util = NULL;
641
642 item = NULL;
643
644 /* skip duplicates and refs that we already have */
645 if (string_list_has_string(&remote_refs, ref->name) ||
646 string_list_has_string(&existing_refs, ref->name))
647 continue;
648
649 item = string_list_insert(&remote_refs, ref->name);
650 item->util = (void *)ref->old_sha1;
651 }
652 string_list_clear(&existing_refs, 0);
653
654 /*
655 * We may have a final lightweight tag that needs to be
656 * checked to see if it needs fetching.
657 */
658 if (item && !has_sha1_file(item->util) &&
659 !will_fetch(head, item->util))
660 item->util = NULL;
661
662 /*
663 * For all the tags in the remote_refs string list,
664 * add them to the list of refs to be fetched
665 */
666 for_each_string_list_item(item, &remote_refs) {
667 /* Unless we have already decided to ignore this item... */
668 if (item->util)
669 {
670 struct ref *rm = alloc_ref(item->string);
671 rm->peer_ref = alloc_ref(item->string);
672 hashcpy(rm->old_sha1, item->util);
673 **tail = rm;
674 *tail = &rm->next;
675 }
676 }
677
678 string_list_clear(&remote_refs, 0);
679}
680
681static void check_not_current_branch(struct ref *ref_map)
682{
683 struct branch *current_branch = branch_get(NULL);
684
685 if (is_bare_repository() || !current_branch)
686 return;
687
688 for (; ref_map; ref_map = ref_map->next)
689 if (ref_map->peer_ref && !strcmp(current_branch->refname,
690 ref_map->peer_ref->name))
691 die(_("Refusing to fetch into current branch %s "
692 "of non-bare repository"), current_branch->refname);
693}
694
695static int truncate_fetch_head(void)
696{
697 char *filename = git_path("FETCH_HEAD");
698 FILE *fp = fopen(filename, "w");
699
700 if (!fp)
701 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
702 fclose(fp);
703 return 0;
704}
705
706static int do_fetch(struct transport *transport,
707 struct refspec *refs, int ref_count)
708{
709 struct string_list existing_refs = STRING_LIST_INIT_NODUP;
710 struct string_list_item *peer_item = NULL;
711 struct ref *ref_map;
712 struct ref *rm;
713 int autotags = (transport->remote->fetch_tags == 1);
714
715 for_each_ref(add_existing, &existing_refs);
716
717 if (tags == TAGS_DEFAULT) {
718 if (transport->remote->fetch_tags == 2)
719 tags = TAGS_SET;
720 if (transport->remote->fetch_tags == -1)
721 tags = TAGS_UNSET;
722 }
723
724 if (!transport->get_refs_list || !transport->fetch)
725 die(_("Don't know how to fetch from %s"), transport->url);
726
727 /* if not appending, truncate FETCH_HEAD */
728 if (!append && !dry_run) {
729 int errcode = truncate_fetch_head();
730 if (errcode)
731 return errcode;
732 }
733
734 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
735 if (!update_head_ok)
736 check_not_current_branch(ref_map);
737
738 for (rm = ref_map; rm; rm = rm->next) {
739 if (rm->peer_ref) {
740 peer_item = string_list_lookup(&existing_refs,
741 rm->peer_ref->name);
742 if (peer_item)
743 hashcpy(rm->peer_ref->old_sha1,
744 peer_item->util);
745 }
746 }
747
748 if (tags == TAGS_DEFAULT && autotags)
749 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
750 if (fetch_refs(transport, ref_map)) {
751 free_refs(ref_map);
752 return 1;
753 }
754 if (prune) {
755 /*
756 * If --tags was specified, pretend that the user gave us
757 * the canonical tags refspec
758 */
759 if (tags == TAGS_SET) {
760 const char *tags_str = "refs/tags/*:refs/tags/*";
761 struct refspec *tags_refspec, *refspec;
762
763 /* Copy the refspec and add the tags to it */
764 refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
765 tags_refspec = parse_fetch_refspec(1, &tags_str);
766 memcpy(refspec, refs, ref_count * sizeof(struct refspec));
767 memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
768 ref_count++;
769
770 prune_refs(refspec, ref_count, ref_map);
771
772 ref_count--;
773 /* The rest of the strings belong to fetch_one */
774 free_refspec(1, tags_refspec);
775 free(refspec);
776 } else if (ref_count) {
777 prune_refs(refs, ref_count, ref_map);
778 } else {
779 prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
780 }
781 }
782 free_refs(ref_map);
783
784 /* if neither --no-tags nor --tags was specified, do automated tag
785 * following ... */
786 if (tags == TAGS_DEFAULT && autotags) {
787 struct ref **tail = &ref_map;
788 ref_map = NULL;
789 find_non_local_tags(transport, &ref_map, &tail);
790 if (ref_map) {
791 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
792 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
793 fetch_refs(transport, ref_map);
794 }
795 free_refs(ref_map);
796 }
797
798 return 0;
799}
800
801static void set_option(const char *name, const char *value)
802{
803 int r = transport_set_option(transport, name, value);
804 if (r < 0)
805 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
806 name, value, transport->url);
807 if (r > 0)
808 warning(_("Option \"%s\" is ignored for %s\n"),
809 name, transport->url);
810}
811
812static int get_one_remote_for_fetch(struct remote *remote, void *priv)
813{
814 struct string_list *list = priv;
815 if (!remote->skip_default_update)
816 string_list_append(list, remote->name);
817 return 0;
818}
819
820struct remote_group_data {
821 const char *name;
822 struct string_list *list;
823};
824
825static int get_remote_group(const char *key, const char *value, void *priv)
826{
827 struct remote_group_data *g = priv;
828
829 if (!prefixcmp(key, "remotes.") &&
830 !strcmp(key + 8, g->name)) {
831 /* split list by white space */
832 int space = strcspn(value, " \t\n");
833 while (*value) {
834 if (space > 1) {
835 string_list_append(g->list,
836 xstrndup(value, space));
837 }
838 value += space + (value[space] != '\0');
839 space = strcspn(value, " \t\n");
840 }
841 }
842
843 return 0;
844}
845
846static int add_remote_or_group(const char *name, struct string_list *list)
847{
848 int prev_nr = list->nr;
849 struct remote_group_data g;
850 g.name = name; g.list = list;
851
852 git_config(get_remote_group, &g);
853 if (list->nr == prev_nr) {
854 struct remote *remote;
855 if (!remote_is_configured(name))
856 return 0;
857 remote = remote_get(name);
858 string_list_append(list, remote->name);
859 }
860 return 1;
861}
862
863static void add_options_to_argv(struct argv_array *argv)
864{
865 if (dry_run)
866 argv_array_push(argv, "--dry-run");
867 if (prune > 0)
868 argv_array_push(argv, "--prune");
869 if (update_head_ok)
870 argv_array_push(argv, "--update-head-ok");
871 if (force)
872 argv_array_push(argv, "--force");
873 if (keep)
874 argv_array_push(argv, "--keep");
875 if (recurse_submodules == RECURSE_SUBMODULES_ON)
876 argv_array_push(argv, "--recurse-submodules");
877 else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
878 argv_array_push(argv, "--recurse-submodules=on-demand");
879 if (tags == TAGS_SET)
880 argv_array_push(argv, "--tags");
881 else if (tags == TAGS_UNSET)
882 argv_array_push(argv, "--no-tags");
883 if (verbosity >= 2)
884 argv_array_push(argv, "-v");
885 if (verbosity >= 1)
886 argv_array_push(argv, "-v");
887 else if (verbosity < 0)
888 argv_array_push(argv, "-q");
889
890}
891
892static int fetch_multiple(struct string_list *list)
893{
894 int i, result = 0;
895 struct argv_array argv = ARGV_ARRAY_INIT;
896
897 if (!append && !dry_run) {
898 int errcode = truncate_fetch_head();
899 if (errcode)
900 return errcode;
901 }
902
903 argv_array_pushl(&argv, "fetch", "--append", NULL);
904 add_options_to_argv(&argv);
905
906 for (i = 0; i < list->nr; i++) {
907 const char *name = list->items[i].string;
908 argv_array_push(&argv, name);
909 if (verbosity >= 0)
910 printf(_("Fetching %s\n"), name);
911 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
912 error(_("Could not fetch %s"), name);
913 result = 1;
914 }
915 argv_array_pop(&argv);
916 }
917
918 argv_array_clear(&argv);
919 return result;
920}
921
922static int fetch_one(struct remote *remote, int argc, const char **argv)
923{
924 int i;
925 static const char **refs = NULL;
926 struct refspec *refspec;
927 int ref_nr = 0;
928 int exit_code;
929
930 if (!remote)
931 die(_("No remote repository specified. Please, specify either a URL or a\n"
932 "remote name from which new revisions should be fetched."));
933
934 transport = transport_get(remote, NULL);
935
936 if (prune < 0) {
937 /* no command line request */
938 if (0 <= transport->remote->prune)
939 prune = transport->remote->prune;
940 else if (0 <= fetch_prune_config)
941 prune = fetch_prune_config;
942 else
943 prune = PRUNE_BY_DEFAULT;
944 }
945
946 transport_set_verbosity(transport, verbosity, progress);
947 if (upload_pack)
948 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
949 if (keep)
950 set_option(TRANS_OPT_KEEP, "yes");
951 if (depth)
952 set_option(TRANS_OPT_DEPTH, depth);
953
954 if (argc > 0) {
955 int j = 0;
956 refs = xcalloc(argc + 1, sizeof(const char *));
957 for (i = 0; i < argc; i++) {
958 if (!strcmp(argv[i], "tag")) {
959 char *ref;
960 i++;
961 if (i >= argc)
962 die(_("You need to specify a tag name."));
963 ref = xmalloc(strlen(argv[i]) * 2 + 22);
964 strcpy(ref, "refs/tags/");
965 strcat(ref, argv[i]);
966 strcat(ref, ":refs/tags/");
967 strcat(ref, argv[i]);
968 refs[j++] = ref;
969 } else
970 refs[j++] = argv[i];
971 }
972 refs[j] = NULL;
973 ref_nr = j;
974 }
975
976 sigchain_push_common(unlock_pack_on_signal);
977 atexit(unlock_pack);
978 refspec = parse_fetch_refspec(ref_nr, refs);
979 exit_code = do_fetch(transport, refspec, ref_nr);
980 free_refspec(ref_nr, refspec);
981 transport_disconnect(transport);
982 transport = NULL;
983 return exit_code;
984}
985
986int cmd_fetch(int argc, const char **argv, const char *prefix)
987{
988 int i;
989 struct string_list list = STRING_LIST_INIT_NODUP;
990 struct remote *remote;
991 int result = 0;
992 static const char *argv_gc_auto[] = {
993 "gc", "--auto", NULL,
994 };
995
996 packet_trace_identity("fetch");
997
998 /* Record the command line for the reflog */
999 strbuf_addstr(&default_rla, "fetch");
1000 for (i = 1; i < argc; i++)
1001 strbuf_addf(&default_rla, " %s", argv[i]);
1002
1003 git_config(git_fetch_config, NULL);
1004
1005 argc = parse_options(argc, argv, prefix,
1006 builtin_fetch_options, builtin_fetch_usage, 0);
1007
1008 if (unshallow) {
1009 if (depth)
1010 die(_("--depth and --unshallow cannot be used together"));
1011 else if (!is_repository_shallow())
1012 die(_("--unshallow on a complete repository does not make sense"));
1013 else {
1014 static char inf_depth[12];
1015 sprintf(inf_depth, "%d", INFINITE_DEPTH);
1016 depth = inf_depth;
1017 }
1018 }
1019
1020 if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1021 if (recurse_submodules_default) {
1022 int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1023 set_config_fetch_recurse_submodules(arg);
1024 }
1025 gitmodules_config();
1026 git_config(submodule_config, NULL);
1027 }
1028
1029 if (all) {
1030 if (argc == 1)
1031 die(_("fetch --all does not take a repository argument"));
1032 else if (argc > 1)
1033 die(_("fetch --all does not make sense with refspecs"));
1034 (void) for_each_remote(get_one_remote_for_fetch, &list);
1035 result = fetch_multiple(&list);
1036 } else if (argc == 0) {
1037 /* No arguments -- use default remote */
1038 remote = remote_get(NULL);
1039 result = fetch_one(remote, argc, argv);
1040 } else if (multiple) {
1041 /* All arguments are assumed to be remotes or groups */
1042 for (i = 0; i < argc; i++)
1043 if (!add_remote_or_group(argv[i], &list))
1044 die(_("No such remote or remote group: %s"), argv[i]);
1045 result = fetch_multiple(&list);
1046 } else {
1047 /* Single remote or group */
1048 (void) add_remote_or_group(argv[0], &list);
1049 if (list.nr > 1) {
1050 /* More than one remote */
1051 if (argc > 1)
1052 die(_("Fetching a group and specifying refspecs does not make sense"));
1053 result = fetch_multiple(&list);
1054 } else {
1055 /* Zero or one remotes */
1056 remote = remote_get(argv[0]);
1057 result = fetch_one(remote, argc-1, argv+1);
1058 }
1059 }
1060
1061 if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1062 struct argv_array options = ARGV_ARRAY_INIT;
1063
1064 add_options_to_argv(&options);
1065 result = fetch_populated_submodules(&options,
1066 submodule_prefix,
1067 recurse_submodules,
1068 verbosity < 0);
1069 argv_array_clear(&options);
1070 }
1071
1072 /* All names were strdup()ed or strndup()ed */
1073 list.strdup_strings = 1;
1074 string_list_clear(&list, 0);
1075
1076 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1077
1078 return result;
1079}