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"
14static const char * const builtin_fetch_usage[] = {
16 "git fetch [options] [<repository> <refspec>...]",
17 NULL
18};
19enum {
21 TAGS_UNSET = 0,
22 TAGS_DEFAULT = 1,
23 TAGS_SET = 2
24};
25static int append, force, keep, update_head_ok, verbosity;
27static int tags = TAGS_DEFAULT;
28static const char *depth;
29static const char *upload_pack;
30static struct strbuf default_rla = STRBUF_INIT;
31static struct transport *transport;
32static struct option builtin_fetch_options[] = {
34 OPT__VERBOSITY(&verbosity),
35 OPT_BOOLEAN('a', "append", &append,
36 "append to .git/FETCH_HEAD instead of overwriting"),
37 OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
38 "path to upload pack on remote end"),
39 OPT_BOOLEAN('f', "force", &force,
40 "force overwrite of local branch"),
41 OPT_SET_INT('t', "tags", &tags,
42 "fetch all tags and associated objects", TAGS_SET),
43 OPT_SET_INT('n', NULL, &tags,
44 "do not fetch all tags (--no-tags)", TAGS_UNSET),
45 OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
46 OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
47 "allow updating of HEAD ref"),
48 OPT_STRING(0, "depth", &depth, "DEPTH",
49 "deepen history of shallow clone"),
50 OPT_END()
51};
52static void unlock_pack(void)
54{
55 if (transport)
56 transport_unlock_pack(transport);
57}
58static void unlock_pack_on_signal(int signo)
60{
61 unlock_pack();
62 sigchain_pop(signo);
63 raise(signo);
64}
65static void add_merge_config(struct ref **head,
67 const struct ref *remote_refs,
68 struct branch *branch,
69 struct ref ***tail)
70{
71 int i;
72 for (i = 0; i < branch->merge_nr; i++) {
74 struct ref *rm, **old_tail = *tail;
75 struct refspec refspec;
76 for (rm = *head; rm; rm = rm->next) {
78 if (branch_merge_matches(branch, i, rm->name)) {
79 rm->merge = 1;
80 break;
81 }
82 }
83 if (rm)
84 continue;
85 /*
87 * Not fetched to a tracking branch? We need to fetch
88 * it anyway to allow this branch's "branch.$name.merge"
89 * to be honored by 'git pull', but we do not have to
90 * fail if branch.$name.merge is misconfigured to point
91 * at a nonexisting branch. If we were indeed called by
92 * 'git pull', it will notice the misconfiguration because
93 * there is no entry in the resulting FETCH_HEAD marked
94 * for merging.
95 */
96 refspec.src = branch->merge[i]->src;
97 refspec.dst = NULL;
98 refspec.pattern = 0;
99 refspec.force = 0;
100 get_fetch_map(remote_refs, &refspec, tail, 1);
101 for (rm = *old_tail; rm; rm = rm->next)
102 rm->merge = 1;
103 }
104}
105static void find_non_local_tags(struct transport *transport,
107 struct ref **head,
108 struct ref ***tail);
109static struct ref *get_ref_map(struct transport *transport,
111 struct refspec *refs, int ref_count, int tags,
112 int *autotags)
113{
114 int i;
115 struct ref *rm;
116 struct ref *ref_map = NULL;
117 struct ref **tail = &ref_map;
118 const struct ref *remote_refs = transport_get_remote_refs(transport);
120 if (ref_count || tags == TAGS_SET) {
122 for (i = 0; i < ref_count; i++) {
123 get_fetch_map(remote_refs, &refs[i], &tail, 0);
124 if (refs[i].dst && refs[i].dst[0])
125 *autotags = 1;
126 }
127 /* Merge everything on the command line, but not --tags */
128 for (rm = ref_map; rm; rm = rm->next)
129 rm->merge = 1;
130 if (tags == TAGS_SET)
131 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
132 } else {
133 /* Use the defaults */
134 struct remote *remote = transport->remote;
135 struct branch *branch = branch_get(NULL);
136 int has_merge = branch_has_merge_config(branch);
137 if (remote && (remote->fetch_refspec_nr || has_merge)) {
138 for (i = 0; i < remote->fetch_refspec_nr; i++) {
139 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
140 if (remote->fetch[i].dst &&
141 remote->fetch[i].dst[0])
142 *autotags = 1;
143 if (!i && !has_merge && ref_map &&
144 !remote->fetch[0].pattern)
145 ref_map->merge = 1;
146 }
147 /*
148 * if the remote we're fetching from is the same
149 * as given in branch.<name>.remote, we add the
150 * ref given in branch.<name>.merge, too.
151 */
152 if (has_merge &&
153 !strcmp(branch->remote_name, remote->name))
154 add_merge_config(&ref_map, remote_refs, branch, &tail);
155 } else {
156 ref_map = get_remote_ref(remote_refs, "HEAD");
157 if (!ref_map)
158 die("Couldn't find remote ref HEAD");
159 ref_map->merge = 1;
160 tail = &ref_map->next;
161 }
162 }
163 if (tags == TAGS_DEFAULT && *autotags)
164 find_non_local_tags(transport, &ref_map, &tail);
165 ref_remove_duplicates(ref_map);
166 return ref_map;
168}
169static int s_update_ref(const char *action,
171 struct ref *ref,
172 int check_old)
173{
174 char msg[1024];
175 char *rla = getenv("GIT_REFLOG_ACTION");
176 static struct ref_lock *lock;
177 if (!rla)
179 rla = default_rla.buf;
180 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
181 lock = lock_any_ref_for_update(ref->name,
182 check_old ? ref->old_sha1 : NULL, 0);
183 if (!lock)
184 return 2;
185 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
186 return 2;
187 return 0;
188}
189#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
191#define REFCOL_WIDTH 10
192static int update_local_ref(struct ref *ref,
194 const char *remote,
195 char *display)
196{
197 struct commit *current = NULL, *updated;
198 enum object_type type;
199 struct branch *current_branch = branch_get(NULL);
200 const char *pretty_ref = prettify_ref(ref);
201 *display = 0;
203 type = sha1_object_info(ref->new_sha1, NULL);
204 if (type < 0)
205 die("object %s not found", sha1_to_hex(ref->new_sha1));
206 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
208 if (verbosity > 0)
209 sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
210 "[up to date]", REFCOL_WIDTH, remote,
211 pretty_ref);
212 return 0;
213 }
214 if (current_branch &&
216 !strcmp(ref->name, current_branch->name) &&
217 !(update_head_ok || is_bare_repository()) &&
218 !is_null_sha1(ref->old_sha1)) {
219 /*
220 * If this is the head, and it's not okay to update
221 * the head, and the old value of the head isn't empty...
222 */
223 sprintf(display, "! %-*s %-*s -> %s (can't fetch in current branch)",
224 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
225 pretty_ref);
226 return 1;
227 }
228 if (!is_null_sha1(ref->old_sha1) &&
230 !prefixcmp(ref->name, "refs/tags/")) {
231 int r;
232 r = s_update_ref("updating tag", ref, 0);
233 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
234 SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
235 pretty_ref, r ? " (unable to update local ref)" : "");
236 return r;
237 }
238 current = lookup_commit_reference_gently(ref->old_sha1, 1);
240 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
241 if (!current || !updated) {
242 const char *msg;
243 const char *what;
244 int r;
245 if (!strncmp(ref->name, "refs/tags/", 10)) {
246 msg = "storing tag";
247 what = "[new tag]";
248 }
249 else {
250 msg = "storing head";
251 what = "[new branch]";
252 }
253 r = s_update_ref(msg, ref, 0);
255 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
256 SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
257 r ? " (unable to update local ref)" : "");
258 return r;
259 }
260 if (in_merge_bases(current, &updated, 1)) {
262 char quickref[83];
263 int r;
264 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
265 strcat(quickref, "..");
266 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
267 r = s_update_ref("fast forward", ref, 1);
268 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
269 SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
270 pretty_ref, r ? " (unable to update local ref)" : "");
271 return r;
272 } else if (force || ref->force) {
273 char quickref[84];
274 int r;
275 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
276 strcat(quickref, "...");
277 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
278 r = s_update_ref("forced-update", ref, 1);
279 sprintf(display, "%c %-*s %-*s -> %s (%s)", r ? '!' : '+',
280 SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
281 pretty_ref,
282 r ? "unable to update local ref" : "forced update");
283 return r;
284 } else {
285 sprintf(display, "! %-*s %-*s -> %s (non fast forward)",
286 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
287 pretty_ref);
288 return 1;
289 }
290}
291static int store_updated_refs(const char *url, const char *remote_name,
293 struct ref *ref_map)
294{
295 FILE *fp;
296 struct commit *commit;
297 int url_len, i, note_len, shown_url = 0, rc = 0;
298 char note[1024];
299 const char *what, *kind;
300 struct ref *rm;
301 char *filename = git_path("FETCH_HEAD");
302 fp = fopen(filename, "a");
304 if (!fp)
305 return error("cannot open %s: %s\n", filename, strerror(errno));
306 for (rm = ref_map; rm; rm = rm->next) {
307 struct ref *ref = NULL;
308 if (rm->peer_ref) {
310 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
311 strcpy(ref->name, rm->peer_ref->name);
312 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
313 hashcpy(ref->new_sha1, rm->old_sha1);
314 ref->force = rm->peer_ref->force;
315 }
316 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
318 if (!commit)
319 rm->merge = 0;
320 if (!strcmp(rm->name, "HEAD")) {
322 kind = "";
323 what = "";
324 }
325 else if (!prefixcmp(rm->name, "refs/heads/")) {
326 kind = "branch";
327 what = rm->name + 11;
328 }
329 else if (!prefixcmp(rm->name, "refs/tags/")) {
330 kind = "tag";
331 what = rm->name + 10;
332 }
333 else if (!prefixcmp(rm->name, "refs/remotes/")) {
334 kind = "remote branch";
335 what = rm->name + 13;
336 }
337 else {
338 kind = "";
339 what = rm->name;
340 }
341 url_len = strlen(url);
343 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
344 ;
345 url_len = i + 1;
346 if (4 < i && !strncmp(".git", url + i - 3, 4))
347 url_len = i - 3;
348 note_len = 0;
350 if (*what) {
351 if (*kind)
352 note_len += sprintf(note + note_len, "%s ",
353 kind);
354 note_len += sprintf(note + note_len, "'%s' of ", what);
355 }
356 note_len += sprintf(note + note_len, "%.*s", url_len, url);
357 fprintf(fp, "%s\t%s\t%s\n",
358 sha1_to_hex(commit ? commit->object.sha1 :
359 rm->old_sha1),
360 rm->merge ? "" : "not-for-merge",
361 note);
362 if (ref)
364 rc |= update_local_ref(ref, what, note);
365 else
366 sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
367 SUMMARY_WIDTH, *kind ? kind : "branch",
368 REFCOL_WIDTH, *what ? what : "HEAD");
369 if (*note) {
370 if (verbosity >= 0 && !shown_url) {
371 fprintf(stderr, "From %.*s\n",
372 url_len, url);
373 shown_url = 1;
374 }
375 if (verbosity >= 0)
376 fprintf(stderr, " %s\n", note);
377 }
378 }
379 fclose(fp);
380 if (rc & 2)
381 error("some local refs could not be updated; try running\n"
382 " 'git remote prune %s' to remove any old, conflicting "
383 "branches", remote_name);
384 return rc;
385}
386/*
388 * We would want to bypass the object transfer altogether if
389 * everything we are going to fetch already exists and connected
390 * locally.
391 *
392 * The refs we are going to fetch are in to_fetch (nr_heads in
393 * total). If running
394 *
395 * $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
396 *
397 * does not error out, that means everything reachable from the
398 * refs we are going to fetch exists and is connected to some of
399 * our existing refs.
400 */
401static int quickfetch(struct ref *ref_map)
402{
403 struct child_process revlist;
404 struct ref *ref;
405 char **argv;
406 int i, err;
407 /*
409 * If we are deepening a shallow clone we already have these
410 * objects reachable. Running rev-list here will return with
411 * a good (0) exit status and we'll bypass the fetch that we
412 * really need to perform. Claiming failure now will ensure
413 * we perform the network exchange to deepen our history.
414 */
415 if (depth)
416 return -1;
417 for (i = 0, ref = ref_map; ref; ref = ref->next)
419 i++;
420 if (!i)
421 return 0;
422 argv = xmalloc(sizeof(*argv) * (i + 6));
424 i = 0;
425 argv[i++] = xstrdup("rev-list");
426 argv[i++] = xstrdup("--quiet");
427 argv[i++] = xstrdup("--objects");
428 for (ref = ref_map; ref; ref = ref->next)
429 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
430 argv[i++] = xstrdup("--not");
431 argv[i++] = xstrdup("--all");
432 argv[i++] = NULL;
433 memset(&revlist, 0, sizeof(revlist));
435 revlist.argv = (const char**)argv;
436 revlist.git_cmd = 1;
437 revlist.no_stdin = 1;
438 revlist.no_stdout = 1;
439 revlist.no_stderr = 1;
440 err = run_command(&revlist);
441 for (i = 0; argv[i]; i++)
443 free(argv[i]);
444 free(argv);
445 return err;
446}
447static int fetch_refs(struct transport *transport, struct ref *ref_map)
449{
450 int ret = quickfetch(ref_map);
451 if (ret)
452 ret = transport_fetch_refs(transport, ref_map);
453 if (!ret)
454 ret |= store_updated_refs(transport->url,
455 transport->remote->name,
456 ref_map);
457 transport_unlock_pack(transport);
458 return ret;
459}
460static int add_existing(const char *refname, const unsigned char *sha1,
462 int flag, void *cbdata)
463{
464 struct string_list *list = (struct string_list *)cbdata;
465 string_list_insert(refname, list);
466 return 0;
467}
468static int will_fetch(struct ref **head, const unsigned char *sha1)
470{
471 struct ref *rm = *head;
472 while (rm) {
473 if (!hashcmp(rm->old_sha1, sha1))
474 return 1;
475 rm = rm->next;
476 }
477 return 0;
478}
479static void find_non_local_tags(struct transport *transport,
481 struct ref **head,
482 struct ref ***tail)
483{
484 struct string_list existing_refs = { NULL, 0, 0, 0 };
485 struct string_list new_refs = { NULL, 0, 0, 1 };
486 char *ref_name;
487 int ref_name_len;
488 const unsigned char *ref_sha1;
489 const struct ref *tag_ref;
490 struct ref *rm = NULL;
491 const struct ref *ref;
492 for_each_ref(add_existing, &existing_refs);
494 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
495 if (prefixcmp(ref->name, "refs/tags"))
496 continue;
497 ref_name = xstrdup(ref->name);
499 ref_name_len = strlen(ref_name);
500 ref_sha1 = ref->old_sha1;
501 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
503 ref_name[ref_name_len - 3] = 0;
504 tag_ref = transport_get_remote_refs(transport);
505 while (tag_ref) {
506 if (!strcmp(tag_ref->name, ref_name)) {
507 ref_sha1 = tag_ref->old_sha1;
508 break;
509 }
510 tag_ref = tag_ref->next;
511 }
512 }
513 if (!string_list_has_string(&existing_refs, ref_name) &&
515 !string_list_has_string(&new_refs, ref_name) &&
516 (has_sha1_file(ref->old_sha1) ||
517 will_fetch(head, ref->old_sha1))) {
518 string_list_insert(ref_name, &new_refs);
519 rm = alloc_ref(ref_name);
521 rm->peer_ref = alloc_ref(ref_name);
522 hashcpy(rm->old_sha1, ref_sha1);
523 **tail = rm;
525 *tail = &rm->next;
526 }
527 free(ref_name);
528 }
529 string_list_clear(&existing_refs, 0);
530 string_list_clear(&new_refs, 0);
531}
532static void check_not_current_branch(struct ref *ref_map)
534{
535 struct branch *current_branch = branch_get(NULL);
536 if (is_bare_repository() || !current_branch)
538 return;
539 for (; ref_map; ref_map = ref_map->next)
541 if (ref_map->peer_ref && !strcmp(current_branch->refname,
542 ref_map->peer_ref->name))
543 die("Refusing to fetch into current branch %s "
544 "of non-bare repository", current_branch->refname);
545}
546static int do_fetch(struct transport *transport,
548 struct refspec *refs, int ref_count)
549{
550 struct ref *ref_map;
551 struct ref *rm;
552 int autotags = (transport->remote->fetch_tags == 1);
553 if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
554 tags = TAGS_SET;
555 if (transport->remote->fetch_tags == -1)
556 tags = TAGS_UNSET;
557 if (!transport->get_refs_list || !transport->fetch)
559 die("Don't know how to fetch from %s", transport->url);
560 /* if not appending, truncate FETCH_HEAD */
562 if (!append) {
563 char *filename = git_path("FETCH_HEAD");
564 FILE *fp = fopen(filename, "w");
565 if (!fp)
566 return error("cannot open %s: %s\n", filename, strerror(errno));
567 fclose(fp);
568 }
569 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
571 if (!update_head_ok)
572 check_not_current_branch(ref_map);
573 for (rm = ref_map; rm; rm = rm->next) {
575 if (rm->peer_ref)
576 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
577 }
578 if (tags == TAGS_DEFAULT && autotags)
580 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
581 if (fetch_refs(transport, ref_map)) {
582 free_refs(ref_map);
583 return 1;
584 }
585 free_refs(ref_map);
586 /* if neither --no-tags nor --tags was specified, do automated tag
588 * following ... */
589 if (tags == TAGS_DEFAULT && autotags) {
590 struct ref **tail = &ref_map;
591 ref_map = NULL;
592 find_non_local_tags(transport, &ref_map, &tail);
593 if (ref_map) {
594 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
595 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
596 fetch_refs(transport, ref_map);
597 }
598 free_refs(ref_map);
599 }
600 return 0;
602}
603static void set_option(const char *name, const char *value)
605{
606 int r = transport_set_option(transport, name, value);
607 if (r < 0)
608 die("Option \"%s\" value \"%s\" is not valid for %s",
609 name, value, transport->url);
610 if (r > 0)
611 warning("Option \"%s\" is ignored for %s\n",
612 name, transport->url);
613}
614int cmd_fetch(int argc, const char **argv, const char *prefix)
616{
617 struct remote *remote;
618 int i;
619 static const char **refs = NULL;
620 int ref_nr = 0;
621 int exit_code;
622 /* Record the command line for the reflog */
624 strbuf_addstr(&default_rla, "fetch");
625 for (i = 1; i < argc; i++)
626 strbuf_addf(&default_rla, " %s", argv[i]);
627 argc = parse_options(argc, argv,
629 builtin_fetch_options, builtin_fetch_usage, 0);
630 if (argc == 0)
632 remote = remote_get(NULL);
633 else
634 remote = remote_get(argv[0]);
635 if (!remote)
637 die("Where do you want to fetch from today?");
638 transport = transport_get(remote, remote->url[0]);
640 if (verbosity >= 2)
641 transport->verbose = 1;
642 if (verbosity < 0)
643 transport->verbose = -1;
644 if (upload_pack)
645 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
646 if (keep)
647 set_option(TRANS_OPT_KEEP, "yes");
648 if (depth)
649 set_option(TRANS_OPT_DEPTH, depth);
650 if (argc > 1) {
652 int j = 0;
653 refs = xcalloc(argc + 1, sizeof(const char *));
654 for (i = 1; i < argc; i++) {
655 if (!strcmp(argv[i], "tag")) {
656 char *ref;
657 i++;
658 if (i >= argc)
659 die("You need to specify a tag name.");
660 ref = xmalloc(strlen(argv[i]) * 2 + 22);
661 strcpy(ref, "refs/tags/");
662 strcat(ref, argv[i]);
663 strcat(ref, ":refs/tags/");
664 strcat(ref, argv[i]);
665 refs[j++] = ref;
666 } else
667 refs[j++] = argv[i];
668 }
669 refs[j] = NULL;
670 ref_nr = j;
671 }
672 sigchain_push_common(unlock_pack_on_signal);
674 atexit(unlock_pack);
675 exit_code = do_fetch(transport,
676 parse_fetch_refspec(ref_nr, refs), ref_nr);
677 transport_disconnect(transport);
678 transport = NULL;
679 return exit_code;
680}