fetch: release pack files before garbage-collecting
[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 "submodule-config.h"
15 #include "submodule.h"
16 #include "connected.h"
17 #include "argv-array.h"
18
19 static 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
27 enum {
28 TAGS_UNSET = 0,
29 TAGS_DEFAULT = 1,
30 TAGS_SET = 2
31 };
32
33 static int fetch_prune_config = -1; /* unspecified */
34 static int prune = -1; /* unspecified */
35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
36
37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
40 static const char *depth;
41 static const char *upload_pack;
42 static struct strbuf default_rla = STRBUF_INIT;
43 static struct transport *gtransport;
44 static struct transport *gsecondary;
45 static const char *submodule_prefix = "";
46 static const char *recurse_submodules_default;
47 static int shown_url = 0;
48 static int refmap_alloc, refmap_nr;
49 static const char **refmap_array;
50
51 static int option_parse_recurse_submodules(const struct option *opt,
52 const char *arg, int unset)
53 {
54 if (unset) {
55 recurse_submodules = RECURSE_SUBMODULES_OFF;
56 } else {
57 if (arg)
58 recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
59 else
60 recurse_submodules = RECURSE_SUBMODULES_ON;
61 }
62 return 0;
63 }
64
65 static int git_fetch_config(const char *k, const char *v, void *cb)
66 {
67 if (!strcmp(k, "fetch.prune")) {
68 fetch_prune_config = git_config_bool(k, v);
69 return 0;
70 }
71 return git_default_config(k, v, cb);
72 }
73
74 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
75 {
76 ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
77
78 /*
79 * "git fetch --refmap='' origin foo"
80 * can be used to tell the command not to store anywhere
81 */
82 if (*arg)
83 refmap_array[refmap_nr++] = arg;
84 return 0;
85 }
86
87 static struct option builtin_fetch_options[] = {
88 OPT__VERBOSITY(&verbosity),
89 OPT_BOOL(0, "all", &all,
90 N_("fetch from all remotes")),
91 OPT_BOOL('a', "append", &append,
92 N_("append to .git/FETCH_HEAD instead of overwriting")),
93 OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
94 N_("path to upload pack on remote end")),
95 OPT__FORCE(&force, N_("force overwrite of local branch")),
96 OPT_BOOL('m', "multiple", &multiple,
97 N_("fetch from multiple remotes")),
98 OPT_SET_INT('t', "tags", &tags,
99 N_("fetch all tags and associated objects"), TAGS_SET),
100 OPT_SET_INT('n', NULL, &tags,
101 N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
102 OPT_BOOL('p', "prune", &prune,
103 N_("prune remote-tracking branches no longer on remote")),
104 { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
105 N_("control recursive fetching of submodules"),
106 PARSE_OPT_OPTARG, option_parse_recurse_submodules },
107 OPT_BOOL(0, "dry-run", &dry_run,
108 N_("dry run")),
109 OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
110 OPT_BOOL('u', "update-head-ok", &update_head_ok,
111 N_("allow updating of HEAD ref")),
112 OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
113 OPT_STRING(0, "depth", &depth, N_("depth"),
114 N_("deepen history of shallow clone")),
115 { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
116 N_("convert to a complete repository"),
117 PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
118 { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
119 N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
120 { OPTION_STRING, 0, "recurse-submodules-default",
121 &recurse_submodules_default, NULL,
122 N_("default mode for recursion"), PARSE_OPT_HIDDEN },
123 OPT_BOOL(0, "update-shallow", &update_shallow,
124 N_("accept refs that update .git/shallow")),
125 { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
126 N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
127 OPT_END()
128 };
129
130 static void unlock_pack(void)
131 {
132 if (gtransport)
133 transport_unlock_pack(gtransport);
134 if (gsecondary)
135 transport_unlock_pack(gsecondary);
136 }
137
138 static void unlock_pack_on_signal(int signo)
139 {
140 unlock_pack();
141 sigchain_pop(signo);
142 raise(signo);
143 }
144
145 static void add_merge_config(struct ref **head,
146 const struct ref *remote_refs,
147 struct branch *branch,
148 struct ref ***tail)
149 {
150 int i;
151
152 for (i = 0; i < branch->merge_nr; i++) {
153 struct ref *rm, **old_tail = *tail;
154 struct refspec refspec;
155
156 for (rm = *head; rm; rm = rm->next) {
157 if (branch_merge_matches(branch, i, rm->name)) {
158 rm->fetch_head_status = FETCH_HEAD_MERGE;
159 break;
160 }
161 }
162 if (rm)
163 continue;
164
165 /*
166 * Not fetched to a remote-tracking branch? We need to fetch
167 * it anyway to allow this branch's "branch.$name.merge"
168 * to be honored by 'git pull', but we do not have to
169 * fail if branch.$name.merge is misconfigured to point
170 * at a nonexisting branch. If we were indeed called by
171 * 'git pull', it will notice the misconfiguration because
172 * there is no entry in the resulting FETCH_HEAD marked
173 * for merging.
174 */
175 memset(&refspec, 0, sizeof(refspec));
176 refspec.src = branch->merge[i]->src;
177 get_fetch_map(remote_refs, &refspec, tail, 1);
178 for (rm = *old_tail; rm; rm = rm->next)
179 rm->fetch_head_status = FETCH_HEAD_MERGE;
180 }
181 }
182
183 static int add_existing(const char *refname, const struct object_id *oid,
184 int flag, void *cbdata)
185 {
186 struct string_list *list = (struct string_list *)cbdata;
187 struct string_list_item *item = string_list_insert(list, refname);
188 struct object_id *old_oid = xmalloc(sizeof(*old_oid));
189
190 oidcpy(old_oid, oid);
191 item->util = old_oid;
192 return 0;
193 }
194
195 static int will_fetch(struct ref **head, const unsigned char *sha1)
196 {
197 struct ref *rm = *head;
198 while (rm) {
199 if (!hashcmp(rm->old_oid.hash, sha1))
200 return 1;
201 rm = rm->next;
202 }
203 return 0;
204 }
205
206 static void find_non_local_tags(struct transport *transport,
207 struct ref **head,
208 struct ref ***tail)
209 {
210 struct string_list existing_refs = STRING_LIST_INIT_DUP;
211 struct string_list remote_refs = STRING_LIST_INIT_NODUP;
212 const struct ref *ref;
213 struct string_list_item *item = NULL;
214
215 for_each_ref(add_existing, &existing_refs);
216 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
217 if (!starts_with(ref->name, "refs/tags/"))
218 continue;
219
220 /*
221 * The peeled ref always follows the matching base
222 * ref, so if we see a peeled ref that we don't want
223 * to fetch then we can mark the ref entry in the list
224 * as one to ignore by setting util to NULL.
225 */
226 if (ends_with(ref->name, "^{}")) {
227 if (item && !has_object_file(&ref->old_oid) &&
228 !will_fetch(head, ref->old_oid.hash) &&
229 !has_sha1_file(item->util) &&
230 !will_fetch(head, item->util))
231 item->util = NULL;
232 item = NULL;
233 continue;
234 }
235
236 /*
237 * If item is non-NULL here, then we previously saw a
238 * ref not followed by a peeled reference, so we need
239 * to check if it is a lightweight tag that we want to
240 * fetch.
241 */
242 if (item && !has_sha1_file(item->util) &&
243 !will_fetch(head, item->util))
244 item->util = NULL;
245
246 item = NULL;
247
248 /* skip duplicates and refs that we already have */
249 if (string_list_has_string(&remote_refs, ref->name) ||
250 string_list_has_string(&existing_refs, ref->name))
251 continue;
252
253 item = string_list_insert(&remote_refs, ref->name);
254 item->util = (void *)&ref->old_oid;
255 }
256 string_list_clear(&existing_refs, 1);
257
258 /*
259 * We may have a final lightweight tag that needs to be
260 * checked to see if it needs fetching.
261 */
262 if (item && !has_sha1_file(item->util) &&
263 !will_fetch(head, item->util))
264 item->util = NULL;
265
266 /*
267 * For all the tags in the remote_refs string list,
268 * add them to the list of refs to be fetched
269 */
270 for_each_string_list_item(item, &remote_refs) {
271 /* Unless we have already decided to ignore this item... */
272 if (item->util)
273 {
274 struct ref *rm = alloc_ref(item->string);
275 rm->peer_ref = alloc_ref(item->string);
276 oidcpy(&rm->old_oid, item->util);
277 **tail = rm;
278 *tail = &rm->next;
279 }
280 }
281
282 string_list_clear(&remote_refs, 0);
283 }
284
285 static struct ref *get_ref_map(struct transport *transport,
286 struct refspec *refspecs, int refspec_count,
287 int tags, int *autotags)
288 {
289 int i;
290 struct ref *rm;
291 struct ref *ref_map = NULL;
292 struct ref **tail = &ref_map;
293
294 /* opportunistically-updated references: */
295 struct ref *orefs = NULL, **oref_tail = &orefs;
296
297 const struct ref *remote_refs = transport_get_remote_refs(transport);
298
299 if (refspec_count) {
300 struct refspec *fetch_refspec;
301 int fetch_refspec_nr;
302
303 for (i = 0; i < refspec_count; i++) {
304 get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
305 if (refspecs[i].dst && refspecs[i].dst[0])
306 *autotags = 1;
307 }
308 /* Merge everything on the command line (but not --tags) */
309 for (rm = ref_map; rm; rm = rm->next)
310 rm->fetch_head_status = FETCH_HEAD_MERGE;
311
312 /*
313 * For any refs that we happen to be fetching via
314 * command-line arguments, the destination ref might
315 * have been missing or have been different than the
316 * remote-tracking ref that would be derived from the
317 * configured refspec. In these cases, we want to
318 * take the opportunity to update their configured
319 * remote-tracking reference. However, we do not want
320 * to mention these entries in FETCH_HEAD at all, as
321 * they would simply be duplicates of existing
322 * entries, so we set them FETCH_HEAD_IGNORE below.
323 *
324 * We compute these entries now, based only on the
325 * refspecs specified on the command line. But we add
326 * them to the list following the refspecs resulting
327 * from the tags option so that one of the latter,
328 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
329 * by ref_remove_duplicates() in favor of one of these
330 * opportunistic entries with FETCH_HEAD_IGNORE.
331 */
332 if (refmap_array) {
333 fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
334 fetch_refspec_nr = refmap_nr;
335 } else {
336 fetch_refspec = transport->remote->fetch;
337 fetch_refspec_nr = transport->remote->fetch_refspec_nr;
338 }
339
340 for (i = 0; i < fetch_refspec_nr; i++)
341 get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
342
343 if (tags == TAGS_SET)
344 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
345 } else if (refmap_array) {
346 die("--refmap option is only meaningful with command-line refspec(s).");
347 } else {
348 /* Use the defaults */
349 struct remote *remote = transport->remote;
350 struct branch *branch = branch_get(NULL);
351 int has_merge = branch_has_merge_config(branch);
352 if (remote &&
353 (remote->fetch_refspec_nr ||
354 /* Note: has_merge implies non-NULL branch->remote_name */
355 (has_merge && !strcmp(branch->remote_name, remote->name)))) {
356 for (i = 0; i < remote->fetch_refspec_nr; i++) {
357 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
358 if (remote->fetch[i].dst &&
359 remote->fetch[i].dst[0])
360 *autotags = 1;
361 if (!i && !has_merge && ref_map &&
362 !remote->fetch[0].pattern)
363 ref_map->fetch_head_status = FETCH_HEAD_MERGE;
364 }
365 /*
366 * if the remote we're fetching from is the same
367 * as given in branch.<name>.remote, we add the
368 * ref given in branch.<name>.merge, too.
369 *
370 * Note: has_merge implies non-NULL branch->remote_name
371 */
372 if (has_merge &&
373 !strcmp(branch->remote_name, remote->name))
374 add_merge_config(&ref_map, remote_refs, branch, &tail);
375 } else {
376 ref_map = get_remote_ref(remote_refs, "HEAD");
377 if (!ref_map)
378 die(_("Couldn't find remote ref HEAD"));
379 ref_map->fetch_head_status = FETCH_HEAD_MERGE;
380 tail = &ref_map->next;
381 }
382 }
383
384 if (tags == TAGS_SET)
385 /* also fetch all tags */
386 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
387 else if (tags == TAGS_DEFAULT && *autotags)
388 find_non_local_tags(transport, &ref_map, &tail);
389
390 /* Now append any refs to be updated opportunistically: */
391 *tail = orefs;
392 for (rm = orefs; rm; rm = rm->next) {
393 rm->fetch_head_status = FETCH_HEAD_IGNORE;
394 tail = &rm->next;
395 }
396
397 return ref_remove_duplicates(ref_map);
398 }
399
400 #define STORE_REF_ERROR_OTHER 1
401 #define STORE_REF_ERROR_DF_CONFLICT 2
402
403 static int s_update_ref(const char *action,
404 struct ref *ref,
405 int check_old)
406 {
407 char msg[1024];
408 char *rla = getenv("GIT_REFLOG_ACTION");
409 struct ref_transaction *transaction;
410 struct strbuf err = STRBUF_INIT;
411 int ret, df_conflict = 0;
412
413 if (dry_run)
414 return 0;
415 if (!rla)
416 rla = default_rla.buf;
417 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
418
419 transaction = ref_transaction_begin(&err);
420 if (!transaction ||
421 ref_transaction_update(transaction, ref->name,
422 ref->new_oid.hash,
423 check_old ? ref->old_oid.hash : NULL,
424 0, msg, &err))
425 goto fail;
426
427 ret = ref_transaction_commit(transaction, &err);
428 if (ret) {
429 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
430 goto fail;
431 }
432
433 ref_transaction_free(transaction);
434 strbuf_release(&err);
435 return 0;
436 fail:
437 ref_transaction_free(transaction);
438 error("%s", err.buf);
439 strbuf_release(&err);
440 return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
441 : STORE_REF_ERROR_OTHER;
442 }
443
444 #define REFCOL_WIDTH 10
445
446 static int update_local_ref(struct ref *ref,
447 const char *remote,
448 const struct ref *remote_ref,
449 struct strbuf *display)
450 {
451 struct commit *current = NULL, *updated;
452 enum object_type type;
453 struct branch *current_branch = branch_get(NULL);
454 const char *pretty_ref = prettify_refname(ref->name);
455
456 type = sha1_object_info(ref->new_oid.hash, NULL);
457 if (type < 0)
458 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
459
460 if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
461 if (verbosity > 0)
462 strbuf_addf(display, "= %-*s %-*s -> %s",
463 TRANSPORT_SUMMARY(_("[up to date]")),
464 REFCOL_WIDTH, remote, pretty_ref);
465 return 0;
466 }
467
468 if (current_branch &&
469 !strcmp(ref->name, current_branch->name) &&
470 !(update_head_ok || is_bare_repository()) &&
471 !is_null_oid(&ref->old_oid)) {
472 /*
473 * If this is the head, and it's not okay to update
474 * the head, and the old value of the head isn't empty...
475 */
476 strbuf_addf(display,
477 _("! %-*s %-*s -> %s (can't fetch in current branch)"),
478 TRANSPORT_SUMMARY(_("[rejected]")),
479 REFCOL_WIDTH, remote, pretty_ref);
480 return 1;
481 }
482
483 if (!is_null_oid(&ref->old_oid) &&
484 starts_with(ref->name, "refs/tags/")) {
485 int r;
486 r = s_update_ref("updating tag", ref, 0);
487 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
488 r ? '!' : '-',
489 TRANSPORT_SUMMARY(_("[tag update]")),
490 REFCOL_WIDTH, remote, pretty_ref,
491 r ? _(" (unable to update local ref)") : "");
492 return r;
493 }
494
495 current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
496 updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
497 if (!current || !updated) {
498 const char *msg;
499 const char *what;
500 int r;
501 /*
502 * Nicely describe the new ref we're fetching.
503 * Base this on the remote's ref name, as it's
504 * more likely to follow a standard layout.
505 */
506 const char *name = remote_ref ? remote_ref->name : "";
507 if (starts_with(name, "refs/tags/")) {
508 msg = "storing tag";
509 what = _("[new tag]");
510 } else if (starts_with(name, "refs/heads/")) {
511 msg = "storing head";
512 what = _("[new branch]");
513 } else {
514 msg = "storing ref";
515 what = _("[new ref]");
516 }
517
518 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
519 (recurse_submodules != RECURSE_SUBMODULES_ON))
520 check_for_new_submodule_commits(ref->new_oid.hash);
521 r = s_update_ref(msg, ref, 0);
522 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
523 r ? '!' : '*',
524 TRANSPORT_SUMMARY(what),
525 REFCOL_WIDTH, remote, pretty_ref,
526 r ? _(" (unable to update local ref)") : "");
527 return r;
528 }
529
530 if (in_merge_bases(current, updated)) {
531 struct strbuf quickref = STRBUF_INIT;
532 int r;
533 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
534 strbuf_addstr(&quickref, "..");
535 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
536 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
537 (recurse_submodules != RECURSE_SUBMODULES_ON))
538 check_for_new_submodule_commits(ref->new_oid.hash);
539 r = s_update_ref("fast-forward", ref, 1);
540 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
541 r ? '!' : ' ',
542 TRANSPORT_SUMMARY_WIDTH, quickref.buf,
543 REFCOL_WIDTH, remote, pretty_ref,
544 r ? _(" (unable to update local ref)") : "");
545 strbuf_release(&quickref);
546 return r;
547 } else if (force || ref->force) {
548 struct strbuf quickref = STRBUF_INIT;
549 int r;
550 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
551 strbuf_addstr(&quickref, "...");
552 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
553 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
554 (recurse_submodules != RECURSE_SUBMODULES_ON))
555 check_for_new_submodule_commits(ref->new_oid.hash);
556 r = s_update_ref("forced-update", ref, 1);
557 strbuf_addf(display, "%c %-*s %-*s -> %s (%s)",
558 r ? '!' : '+',
559 TRANSPORT_SUMMARY_WIDTH, quickref.buf,
560 REFCOL_WIDTH, remote, pretty_ref,
561 r ? _("unable to update local ref") : _("forced update"));
562 strbuf_release(&quickref);
563 return r;
564 } else {
565 strbuf_addf(display, "! %-*s %-*s -> %s %s",
566 TRANSPORT_SUMMARY(_("[rejected]")),
567 REFCOL_WIDTH, remote, pretty_ref,
568 _("(non-fast-forward)"));
569 return 1;
570 }
571 }
572
573 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
574 {
575 struct ref **rm = cb_data;
576 struct ref *ref = *rm;
577
578 while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
579 ref = ref->next;
580 if (!ref)
581 return -1; /* end of the list */
582 *rm = ref->next;
583 hashcpy(sha1, ref->old_oid.hash);
584 return 0;
585 }
586
587 static int store_updated_refs(const char *raw_url, const char *remote_name,
588 struct ref *ref_map)
589 {
590 FILE *fp;
591 struct commit *commit;
592 int url_len, i, rc = 0;
593 struct strbuf note = STRBUF_INIT;
594 const char *what, *kind;
595 struct ref *rm;
596 char *url;
597 const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
598 int want_status;
599
600 fp = fopen(filename, "a");
601 if (!fp)
602 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
603
604 if (raw_url)
605 url = transport_anonymize_url(raw_url);
606 else
607 url = xstrdup("foreign");
608
609 rm = ref_map;
610 if (check_everything_connected(iterate_ref_map, 0, &rm)) {
611 rc = error(_("%s did not send all necessary objects\n"), url);
612 goto abort;
613 }
614
615 /*
616 * We do a pass for each fetch_head_status type in their enum order, so
617 * merged entries are written before not-for-merge. That lets readers
618 * use FETCH_HEAD as a refname to refer to the ref to be merged.
619 */
620 for (want_status = FETCH_HEAD_MERGE;
621 want_status <= FETCH_HEAD_IGNORE;
622 want_status++) {
623 for (rm = ref_map; rm; rm = rm->next) {
624 struct ref *ref = NULL;
625 const char *merge_status_marker = "";
626
627 if (rm->status == REF_STATUS_REJECT_SHALLOW) {
628 if (want_status == FETCH_HEAD_MERGE)
629 warning(_("reject %s because shallow roots are not allowed to be updated"),
630 rm->peer_ref ? rm->peer_ref->name : rm->name);
631 continue;
632 }
633
634 commit = lookup_commit_reference_gently(rm->old_oid.hash, 1);
635 if (!commit)
636 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
637
638 if (rm->fetch_head_status != want_status)
639 continue;
640
641 if (rm->peer_ref) {
642 ref = alloc_ref(rm->peer_ref->name);
643 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
644 oidcpy(&ref->new_oid, &rm->old_oid);
645 ref->force = rm->peer_ref->force;
646 }
647
648
649 if (!strcmp(rm->name, "HEAD")) {
650 kind = "";
651 what = "";
652 }
653 else if (starts_with(rm->name, "refs/heads/")) {
654 kind = "branch";
655 what = rm->name + 11;
656 }
657 else if (starts_with(rm->name, "refs/tags/")) {
658 kind = "tag";
659 what = rm->name + 10;
660 }
661 else if (starts_with(rm->name, "refs/remotes/")) {
662 kind = "remote-tracking branch";
663 what = rm->name + 13;
664 }
665 else {
666 kind = "";
667 what = rm->name;
668 }
669
670 url_len = strlen(url);
671 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
672 ;
673 url_len = i + 1;
674 if (4 < i && !strncmp(".git", url + i - 3, 4))
675 url_len = i - 3;
676
677 strbuf_reset(&note);
678 if (*what) {
679 if (*kind)
680 strbuf_addf(&note, "%s ", kind);
681 strbuf_addf(&note, "'%s' of ", what);
682 }
683 switch (rm->fetch_head_status) {
684 case FETCH_HEAD_NOT_FOR_MERGE:
685 merge_status_marker = "not-for-merge";
686 /* fall-through */
687 case FETCH_HEAD_MERGE:
688 fprintf(fp, "%s\t%s\t%s",
689 oid_to_hex(&rm->old_oid),
690 merge_status_marker,
691 note.buf);
692 for (i = 0; i < url_len; ++i)
693 if ('\n' == url[i])
694 fputs("\\n", fp);
695 else
696 fputc(url[i], fp);
697 fputc('\n', fp);
698 break;
699 default:
700 /* do not write anything to FETCH_HEAD */
701 break;
702 }
703
704 strbuf_reset(&note);
705 if (ref) {
706 rc |= update_local_ref(ref, what, rm, &note);
707 free(ref);
708 } else
709 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
710 TRANSPORT_SUMMARY_WIDTH,
711 *kind ? kind : "branch",
712 REFCOL_WIDTH,
713 *what ? what : "HEAD");
714 if (note.len) {
715 if (verbosity >= 0 && !shown_url) {
716 fprintf(stderr, _("From %.*s\n"),
717 url_len, url);
718 shown_url = 1;
719 }
720 if (verbosity >= 0)
721 fprintf(stderr, " %s\n", note.buf);
722 }
723 }
724 }
725
726 if (rc & STORE_REF_ERROR_DF_CONFLICT)
727 error(_("some local refs could not be updated; try running\n"
728 " 'git remote prune %s' to remove any old, conflicting "
729 "branches"), remote_name);
730
731 abort:
732 strbuf_release(&note);
733 free(url);
734 fclose(fp);
735 return rc;
736 }
737
738 /*
739 * We would want to bypass the object transfer altogether if
740 * everything we are going to fetch already exists and is connected
741 * locally.
742 */
743 static int quickfetch(struct ref *ref_map)
744 {
745 struct ref *rm = ref_map;
746
747 /*
748 * If we are deepening a shallow clone we already have these
749 * objects reachable. Running rev-list here will return with
750 * a good (0) exit status and we'll bypass the fetch that we
751 * really need to perform. Claiming failure now will ensure
752 * we perform the network exchange to deepen our history.
753 */
754 if (depth)
755 return -1;
756 return check_everything_connected(iterate_ref_map, 1, &rm);
757 }
758
759 static int fetch_refs(struct transport *transport, struct ref *ref_map)
760 {
761 int ret = quickfetch(ref_map);
762 if (ret)
763 ret = transport_fetch_refs(transport, ref_map);
764 if (!ret)
765 ret |= store_updated_refs(transport->url,
766 transport->remote->name,
767 ref_map);
768 transport_unlock_pack(transport);
769 return ret;
770 }
771
772 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
773 const char *raw_url)
774 {
775 int url_len, i, result = 0;
776 struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
777 char *url;
778 const char *dangling_msg = dry_run
779 ? _(" (%s will become dangling)")
780 : _(" (%s has become dangling)");
781
782 if (raw_url)
783 url = transport_anonymize_url(raw_url);
784 else
785 url = xstrdup("foreign");
786
787 url_len = strlen(url);
788 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
789 ;
790
791 url_len = i + 1;
792 if (4 < i && !strncmp(".git", url + i - 3, 4))
793 url_len = i - 3;
794
795 if (!dry_run) {
796 struct string_list refnames = STRING_LIST_INIT_NODUP;
797
798 for (ref = stale_refs; ref; ref = ref->next)
799 string_list_append(&refnames, ref->name);
800
801 result = delete_refs(&refnames);
802 string_list_clear(&refnames, 0);
803 }
804
805 if (verbosity >= 0) {
806 for (ref = stale_refs; ref; ref = ref->next) {
807 if (!shown_url) {
808 fprintf(stderr, _("From %.*s\n"), url_len, url);
809 shown_url = 1;
810 }
811 fprintf(stderr, " x %-*s %-*s -> %s\n",
812 TRANSPORT_SUMMARY(_("[deleted]")),
813 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
814 warn_dangling_symref(stderr, dangling_msg, ref->name);
815 }
816 }
817
818 free(url);
819 free_refs(stale_refs);
820 return result;
821 }
822
823 static void check_not_current_branch(struct ref *ref_map)
824 {
825 struct branch *current_branch = branch_get(NULL);
826
827 if (is_bare_repository() || !current_branch)
828 return;
829
830 for (; ref_map; ref_map = ref_map->next)
831 if (ref_map->peer_ref && !strcmp(current_branch->refname,
832 ref_map->peer_ref->name))
833 die(_("Refusing to fetch into current branch %s "
834 "of non-bare repository"), current_branch->refname);
835 }
836
837 static int truncate_fetch_head(void)
838 {
839 const char *filename = git_path_fetch_head();
840 FILE *fp = fopen(filename, "w");
841
842 if (!fp)
843 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
844 fclose(fp);
845 return 0;
846 }
847
848 static void set_option(struct transport *transport, const char *name, const char *value)
849 {
850 int r = transport_set_option(transport, name, value);
851 if (r < 0)
852 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
853 name, value, transport->url);
854 if (r > 0)
855 warning(_("Option \"%s\" is ignored for %s\n"),
856 name, transport->url);
857 }
858
859 static struct transport *prepare_transport(struct remote *remote)
860 {
861 struct transport *transport;
862 transport = transport_get(remote, NULL);
863 transport_set_verbosity(transport, verbosity, progress);
864 if (upload_pack)
865 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
866 if (keep)
867 set_option(transport, TRANS_OPT_KEEP, "yes");
868 if (depth)
869 set_option(transport, TRANS_OPT_DEPTH, depth);
870 if (update_shallow)
871 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
872 return transport;
873 }
874
875 static void backfill_tags(struct transport *transport, struct ref *ref_map)
876 {
877 if (transport->cannot_reuse) {
878 gsecondary = prepare_transport(transport->remote);
879 transport = gsecondary;
880 }
881
882 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
883 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
884 fetch_refs(transport, ref_map);
885
886 if (gsecondary) {
887 transport_disconnect(gsecondary);
888 gsecondary = NULL;
889 }
890 }
891
892 static int do_fetch(struct transport *transport,
893 struct refspec *refs, int ref_count)
894 {
895 struct string_list existing_refs = STRING_LIST_INIT_DUP;
896 struct ref *ref_map;
897 struct ref *rm;
898 int autotags = (transport->remote->fetch_tags == 1);
899 int retcode = 0;
900
901 for_each_ref(add_existing, &existing_refs);
902
903 if (tags == TAGS_DEFAULT) {
904 if (transport->remote->fetch_tags == 2)
905 tags = TAGS_SET;
906 if (transport->remote->fetch_tags == -1)
907 tags = TAGS_UNSET;
908 }
909
910 if (!transport->get_refs_list || !transport->fetch)
911 die(_("Don't know how to fetch from %s"), transport->url);
912
913 /* if not appending, truncate FETCH_HEAD */
914 if (!append && !dry_run) {
915 retcode = truncate_fetch_head();
916 if (retcode)
917 goto cleanup;
918 }
919
920 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
921 if (!update_head_ok)
922 check_not_current_branch(ref_map);
923
924 for (rm = ref_map; rm; rm = rm->next) {
925 if (rm->peer_ref) {
926 struct string_list_item *peer_item =
927 string_list_lookup(&existing_refs,
928 rm->peer_ref->name);
929 if (peer_item) {
930 struct object_id *old_oid = peer_item->util;
931 oidcpy(&rm->peer_ref->old_oid, old_oid);
932 }
933 }
934 }
935
936 if (tags == TAGS_DEFAULT && autotags)
937 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
938 if (prune) {
939 /*
940 * We only prune based on refspecs specified
941 * explicitly (via command line or configuration); we
942 * don't care whether --tags was specified.
943 */
944 if (ref_count) {
945 prune_refs(refs, ref_count, ref_map, transport->url);
946 } else {
947 prune_refs(transport->remote->fetch,
948 transport->remote->fetch_refspec_nr,
949 ref_map,
950 transport->url);
951 }
952 }
953 if (fetch_refs(transport, ref_map)) {
954 free_refs(ref_map);
955 retcode = 1;
956 goto cleanup;
957 }
958 free_refs(ref_map);
959
960 /* if neither --no-tags nor --tags was specified, do automated tag
961 * following ... */
962 if (tags == TAGS_DEFAULT && autotags) {
963 struct ref **tail = &ref_map;
964 ref_map = NULL;
965 find_non_local_tags(transport, &ref_map, &tail);
966 if (ref_map)
967 backfill_tags(transport, ref_map);
968 free_refs(ref_map);
969 }
970
971 cleanup:
972 string_list_clear(&existing_refs, 1);
973 return retcode;
974 }
975
976 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
977 {
978 struct string_list *list = priv;
979 if (!remote->skip_default_update)
980 string_list_append(list, remote->name);
981 return 0;
982 }
983
984 struct remote_group_data {
985 const char *name;
986 struct string_list *list;
987 };
988
989 static int get_remote_group(const char *key, const char *value, void *priv)
990 {
991 struct remote_group_data *g = priv;
992
993 if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
994 /* split list by white space */
995 while (*value) {
996 size_t wordlen = strcspn(value, " \t\n");
997
998 if (wordlen >= 1)
999 string_list_append(g->list,
1000 xstrndup(value, wordlen));
1001 value += wordlen + (value[wordlen] != '\0');
1002 }
1003 }
1004
1005 return 0;
1006 }
1007
1008 static int add_remote_or_group(const char *name, struct string_list *list)
1009 {
1010 int prev_nr = list->nr;
1011 struct remote_group_data g;
1012 g.name = name; g.list = list;
1013
1014 git_config(get_remote_group, &g);
1015 if (list->nr == prev_nr) {
1016 struct remote *remote;
1017 if (!remote_is_configured(name))
1018 return 0;
1019 remote = remote_get(name);
1020 string_list_append(list, remote->name);
1021 }
1022 return 1;
1023 }
1024
1025 static void add_options_to_argv(struct argv_array *argv)
1026 {
1027 if (dry_run)
1028 argv_array_push(argv, "--dry-run");
1029 if (prune != -1)
1030 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1031 if (update_head_ok)
1032 argv_array_push(argv, "--update-head-ok");
1033 if (force)
1034 argv_array_push(argv, "--force");
1035 if (keep)
1036 argv_array_push(argv, "--keep");
1037 if (recurse_submodules == RECURSE_SUBMODULES_ON)
1038 argv_array_push(argv, "--recurse-submodules");
1039 else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1040 argv_array_push(argv, "--recurse-submodules=on-demand");
1041 if (tags == TAGS_SET)
1042 argv_array_push(argv, "--tags");
1043 else if (tags == TAGS_UNSET)
1044 argv_array_push(argv, "--no-tags");
1045 if (verbosity >= 2)
1046 argv_array_push(argv, "-v");
1047 if (verbosity >= 1)
1048 argv_array_push(argv, "-v");
1049 else if (verbosity < 0)
1050 argv_array_push(argv, "-q");
1051
1052 }
1053
1054 static int fetch_multiple(struct string_list *list)
1055 {
1056 int i, result = 0;
1057 struct argv_array argv = ARGV_ARRAY_INIT;
1058
1059 if (!append && !dry_run) {
1060 int errcode = truncate_fetch_head();
1061 if (errcode)
1062 return errcode;
1063 }
1064
1065 argv_array_pushl(&argv, "fetch", "--append", NULL);
1066 add_options_to_argv(&argv);
1067
1068 for (i = 0; i < list->nr; i++) {
1069 const char *name = list->items[i].string;
1070 argv_array_push(&argv, name);
1071 if (verbosity >= 0)
1072 printf(_("Fetching %s\n"), name);
1073 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1074 error(_("Could not fetch %s"), name);
1075 result = 1;
1076 }
1077 argv_array_pop(&argv);
1078 }
1079
1080 argv_array_clear(&argv);
1081 return result;
1082 }
1083
1084 static int fetch_one(struct remote *remote, int argc, const char **argv)
1085 {
1086 static const char **refs = NULL;
1087 struct refspec *refspec;
1088 int ref_nr = 0;
1089 int exit_code;
1090
1091 if (!remote)
1092 die(_("No remote repository specified. Please, specify either a URL or a\n"
1093 "remote name from which new revisions should be fetched."));
1094
1095 gtransport = prepare_transport(remote);
1096
1097 if (prune < 0) {
1098 /* no command line request */
1099 if (0 <= gtransport->remote->prune)
1100 prune = gtransport->remote->prune;
1101 else if (0 <= fetch_prune_config)
1102 prune = fetch_prune_config;
1103 else
1104 prune = PRUNE_BY_DEFAULT;
1105 }
1106
1107 if (argc > 0) {
1108 int j = 0;
1109 int i;
1110 refs = xcalloc(argc + 1, sizeof(const char *));
1111 for (i = 0; i < argc; i++) {
1112 if (!strcmp(argv[i], "tag")) {
1113 i++;
1114 if (i >= argc)
1115 die(_("You need to specify a tag name."));
1116 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1117 argv[i], argv[i]);
1118 } else
1119 refs[j++] = argv[i];
1120 }
1121 refs[j] = NULL;
1122 ref_nr = j;
1123 }
1124
1125 sigchain_push_common(unlock_pack_on_signal);
1126 atexit(unlock_pack);
1127 refspec = parse_fetch_refspec(ref_nr, refs);
1128 exit_code = do_fetch(gtransport, refspec, ref_nr);
1129 free_refspec(ref_nr, refspec);
1130 transport_disconnect(gtransport);
1131 gtransport = NULL;
1132 return exit_code;
1133 }
1134
1135 int cmd_fetch(int argc, const char **argv, const char *prefix)
1136 {
1137 int i;
1138 struct string_list list = STRING_LIST_INIT_NODUP;
1139 struct remote *remote;
1140 int result = 0;
1141 struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1142
1143 packet_trace_identity("fetch");
1144
1145 /* Record the command line for the reflog */
1146 strbuf_addstr(&default_rla, "fetch");
1147 for (i = 1; i < argc; i++)
1148 strbuf_addf(&default_rla, " %s", argv[i]);
1149
1150 git_config(git_fetch_config, NULL);
1151
1152 argc = parse_options(argc, argv, prefix,
1153 builtin_fetch_options, builtin_fetch_usage, 0);
1154
1155 if (unshallow) {
1156 if (depth)
1157 die(_("--depth and --unshallow cannot be used together"));
1158 else if (!is_repository_shallow())
1159 die(_("--unshallow on a complete repository does not make sense"));
1160 else
1161 depth = xstrfmt("%d", INFINITE_DEPTH);
1162 }
1163
1164 /* no need to be strict, transport_set_option() will validate it again */
1165 if (depth && atoi(depth) < 1)
1166 die(_("depth %s is not a positive number"), depth);
1167
1168 if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1169 if (recurse_submodules_default) {
1170 int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1171 set_config_fetch_recurse_submodules(arg);
1172 }
1173 gitmodules_config();
1174 git_config(submodule_config, NULL);
1175 }
1176
1177 if (all) {
1178 if (argc == 1)
1179 die(_("fetch --all does not take a repository argument"));
1180 else if (argc > 1)
1181 die(_("fetch --all does not make sense with refspecs"));
1182 (void) for_each_remote(get_one_remote_for_fetch, &list);
1183 result = fetch_multiple(&list);
1184 } else if (argc == 0) {
1185 /* No arguments -- use default remote */
1186 remote = remote_get(NULL);
1187 result = fetch_one(remote, argc, argv);
1188 } else if (multiple) {
1189 /* All arguments are assumed to be remotes or groups */
1190 for (i = 0; i < argc; i++)
1191 if (!add_remote_or_group(argv[i], &list))
1192 die(_("No such remote or remote group: %s"), argv[i]);
1193 result = fetch_multiple(&list);
1194 } else {
1195 /* Single remote or group */
1196 (void) add_remote_or_group(argv[0], &list);
1197 if (list.nr > 1) {
1198 /* More than one remote */
1199 if (argc > 1)
1200 die(_("Fetching a group and specifying refspecs does not make sense"));
1201 result = fetch_multiple(&list);
1202 } else {
1203 /* Zero or one remotes */
1204 remote = remote_get(argv[0]);
1205 result = fetch_one(remote, argc-1, argv+1);
1206 }
1207 }
1208
1209 if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1210 struct argv_array options = ARGV_ARRAY_INIT;
1211
1212 add_options_to_argv(&options);
1213 result = fetch_populated_submodules(&options,
1214 submodule_prefix,
1215 recurse_submodules,
1216 verbosity < 0);
1217 argv_array_clear(&options);
1218 }
1219
1220 /* All names were strdup()ed or strndup()ed */
1221 list.strdup_strings = 1;
1222 string_list_clear(&list, 0);
1223
1224 close_all_packs();
1225
1226 argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1227 if (verbosity < 0)
1228 argv_array_push(&argv_gc_auto, "--quiet");
1229 run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1230 argv_array_clear(&argv_gc_auto);
1231
1232 return result;
1233 }