1/*
2 * "git fetch"
3 */
4#include "cache.h"
5#include "refs.h"
6#include "commit.h"
7#include "builtin.h"
8#include "path-list.h"
9#include "remote.h"
10#include "transport.h"
11#include "run-command.h"
12static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";
14static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
16static const char *depth;
17static char *default_rla = NULL;
18static struct transport *transport;
19static void unlock_pack(void)
21{
22 if (transport)
23 transport_unlock_pack(transport);
24}
25static void unlock_pack_on_signal(int signo)
27{
28 unlock_pack();
29 signal(SIGINT, SIG_DFL);
30 raise(signo);
31}
32static void add_merge_config(struct ref **head,
34 struct ref *remote_refs,
35 struct branch *branch,
36 struct ref ***tail)
37{
38 int i;
39 for (i = 0; i < branch->merge_nr; i++) {
41 struct ref *rm, **old_tail = *tail;
42 struct refspec refspec;
43 for (rm = *head; rm; rm = rm->next) {
45 if (branch_merge_matches(branch, i, rm->name)) {
46 rm->merge = 1;
47 break;
48 }
49 }
50 if (rm)
51 continue;
52 /*
54 * Not fetched to a tracking branch? We need to fetch
55 * it anyway to allow this branch's "branch.$name.merge"
56 * to be honored by git-pull, but we do not have to
57 * fail if branch.$name.merge is misconfigured to point
58 * at a nonexisting branch. If we were indeed called by
59 * git-pull, it will notice the misconfiguration because
60 * there is no entry in the resulting FETCH_HEAD marked
61 * for merging.
62 */
63 refspec.src = branch->merge[i]->src;
64 refspec.dst = NULL;
65 refspec.pattern = 0;
66 refspec.force = 0;
67 get_fetch_map(remote_refs, &refspec, tail, 1);
68 for (rm = *old_tail; rm; rm = rm->next)
69 rm->merge = 1;
70 }
71}
72static struct ref *get_ref_map(struct transport *transport,
74 struct refspec *refs, int ref_count, int tags,
75 int *autotags)
76{
77 int i;
78 struct ref *rm;
79 struct ref *ref_map = NULL;
80 struct ref **tail = &ref_map;
81 struct ref *remote_refs = transport_get_remote_refs(transport);
83 if (ref_count || tags) {
85 for (i = 0; i < ref_count; i++) {
86 get_fetch_map(remote_refs, &refs[i], &tail, 0);
87 if (refs[i].dst && refs[i].dst[0])
88 *autotags = 1;
89 }
90 /* Merge everything on the command line, but not --tags */
91 for (rm = ref_map; rm; rm = rm->next)
92 rm->merge = 1;
93 if (tags) {
94 struct refspec refspec;
95 refspec.src = "refs/tags/";
96 refspec.dst = "refs/tags/";
97 refspec.pattern = 1;
98 refspec.force = 0;
99 get_fetch_map(remote_refs, &refspec, &tail, 0);
100 }
101 } else {
102 /* Use the defaults */
103 struct remote *remote = transport->remote;
104 struct branch *branch = branch_get(NULL);
105 int has_merge = branch_has_merge_config(branch);
106 if (remote && (remote->fetch_refspec_nr || has_merge)) {
107 for (i = 0; i < remote->fetch_refspec_nr; i++) {
108 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
109 if (remote->fetch[i].dst &&
110 remote->fetch[i].dst[0])
111 *autotags = 1;
112 if (!i && !has_merge && ref_map &&
113 !remote->fetch[0].pattern)
114 ref_map->merge = 1;
115 }
116 /*
117 * if the remote we're fetching from is the same
118 * as given in branch.<name>.remote, we add the
119 * ref given in branch.<name>.merge, too.
120 */
121 if (has_merge &&
122 !strcmp(branch->remote_name, remote->name))
123 add_merge_config(&ref_map, remote_refs, branch, &tail);
124 } else {
125 ref_map = get_remote_ref(remote_refs, "HEAD");
126 if (!ref_map)
127 die("Couldn't find remote ref HEAD");
128 ref_map->merge = 1;
129 }
130 }
131 ref_remove_duplicates(ref_map);
132 return ref_map;
134}
135static int s_update_ref(const char *action,
137 struct ref *ref,
138 int check_old)
139{
140 char msg[1024];
141 char *rla = getenv("GIT_REFLOG_ACTION");
142 static struct ref_lock *lock;
143 if (!rla)
145 rla = default_rla;
146 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
147 lock = lock_any_ref_for_update(ref->name,
148 check_old ? ref->old_sha1 : NULL, 0);
149 if (!lock)
150 return 1;
151 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
152 return 1;
153 return 0;
154}
155#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
157#define REFCOL_WIDTH 10
158static int update_local_ref(struct ref *ref,
160 const char *remote,
161 int verbose,
162 char *display)
163{
164 struct commit *current = NULL, *updated;
165 enum object_type type;
166 struct branch *current_branch = branch_get(NULL);
167 const char *pretty_ref = ref->name + (
168 !prefixcmp(ref->name, "refs/heads/") ? 11 :
169 !prefixcmp(ref->name, "refs/tags/") ? 10 :
170 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
171 0);
172 *display = 0;
174 type = sha1_object_info(ref->new_sha1, NULL);
175 if (type < 0)
176 die("object %s not found", sha1_to_hex(ref->new_sha1));
177 if (!*ref->name) {
179 /* Not storing */
180 if (verbose)
181 sprintf(display, "* branch %s -> FETCH_HEAD", remote);
182 return 0;
183 }
184 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
186 if (verbose)
187 sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
188 "[up to date]", REFCOL_WIDTH, remote,
189 pretty_ref);
190 return 0;
191 }
192 if (current_branch &&
194 !strcmp(ref->name, current_branch->name) &&
195 !(update_head_ok || is_bare_repository()) &&
196 !is_null_sha1(ref->old_sha1)) {
197 /*
198 * If this is the head, and it's not okay to update
199 * the head, and the old value of the head isn't empty...
200 */
201 sprintf(display, "! %-*s %-*s -> %s (can't fetch in current branch)",
202 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
203 pretty_ref);
204 return 1;
205 }
206 if (!is_null_sha1(ref->old_sha1) &&
208 !prefixcmp(ref->name, "refs/tags/")) {
209 sprintf(display, "- %-*s %-*s -> %s",
210 SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
211 pretty_ref);
212 return s_update_ref("updating tag", ref, 0);
213 }
214 current = lookup_commit_reference_gently(ref->old_sha1, 1);
216 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
217 if (!current || !updated) {
218 const char *msg;
219 const char *what;
220 if (!strncmp(ref->name, "refs/tags/", 10)) {
221 msg = "storing tag";
222 what = "[new tag]";
223 }
224 else {
225 msg = "storing head";
226 what = "[new branch]";
227 }
228 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
230 REFCOL_WIDTH, remote, pretty_ref);
231 return s_update_ref(msg, ref, 0);
232 }
233 if (in_merge_bases(current, &updated, 1)) {
235 char quickref[83];
236 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
237 strcat(quickref, "..");
238 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
239 sprintf(display, " %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
240 REFCOL_WIDTH, remote, pretty_ref);
241 return s_update_ref("fast forward", ref, 1);
242 } else if (force || ref->force) {
243 char quickref[84];
244 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
245 strcat(quickref, "...");
246 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
247 sprintf(display, "+ %-*s %-*s -> %s (forced update)",
248 SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
249 return s_update_ref("forced-update", ref, 1);
250 } else {
251 sprintf(display, "! %-*s %-*s -> %s (non fast forward)",
252 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
253 pretty_ref);
254 return 1;
255 }
256}
257static void store_updated_refs(const char *url, struct ref *ref_map)
259{
260 FILE *fp;
261 struct commit *commit;
262 int url_len, i, note_len, shown_url = 0;
263 char note[1024];
264 const char *what, *kind;
265 struct ref *rm;
266 fp = fopen(git_path("FETCH_HEAD"), "a");
268 for (rm = ref_map; rm; rm = rm->next) {
269 struct ref *ref = NULL;
270 if (rm->peer_ref) {
272 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
273 strcpy(ref->name, rm->peer_ref->name);
274 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
275 hashcpy(ref->new_sha1, rm->old_sha1);
276 ref->force = rm->peer_ref->force;
277 }
278 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
280 if (!commit)
281 rm->merge = 0;
282 if (!strcmp(rm->name, "HEAD")) {
284 kind = "";
285 what = "";
286 }
287 else if (!prefixcmp(rm->name, "refs/heads/")) {
288 kind = "branch";
289 what = rm->name + 11;
290 }
291 else if (!prefixcmp(rm->name, "refs/tags/")) {
292 kind = "tag";
293 what = rm->name + 10;
294 }
295 else if (!prefixcmp(rm->name, "refs/remotes/")) {
296 kind = "remote branch";
297 what = rm->name + 13;
298 }
299 else {
300 kind = "";
301 what = rm->name;
302 }
303 url_len = strlen(url);
305 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
306 ;
307 url_len = i + 1;
308 if (4 < i && !strncmp(".git", url + i - 3, 4))
309 url_len = i - 3;
310 note_len = 0;
312 if (*what) {
313 if (*kind)
314 note_len += sprintf(note + note_len, "%s ",
315 kind);
316 note_len += sprintf(note + note_len, "'%s' of ", what);
317 }
318 note_len += sprintf(note + note_len, "%.*s", url_len, url);
319 fprintf(fp, "%s\t%s\t%s\n",
320 sha1_to_hex(commit ? commit->object.sha1 :
321 rm->old_sha1),
322 rm->merge ? "" : "not-for-merge",
323 note);
324 if (ref) {
326 update_local_ref(ref, what, verbose, note);
327 if (*note) {
328 if (!shown_url) {
329 fprintf(stderr, "From %.*s\n",
330 url_len, url);
331 shown_url = 1;
332 }
333 fprintf(stderr, " %s\n", note);
334 }
335 }
336 }
337 fclose(fp);
338}
339/*
341 * We would want to bypass the object transfer altogether if
342 * everything we are going to fetch already exists and connected
343 * locally.
344 *
345 * The refs we are going to fetch are in to_fetch (nr_heads in
346 * total). If running
347 *
348 * $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
349 *
350 * does not error out, that means everything reachable from the
351 * refs we are going to fetch exists and is connected to some of
352 * our existing refs.
353 */
354static int quickfetch(struct ref *ref_map)
355{
356 struct child_process revlist;
357 struct ref *ref;
358 char **argv;
359 int i, err;
360 /*
362 * If we are deepening a shallow clone we already have these
363 * objects reachable. Running rev-list here will return with
364 * a good (0) exit status and we'll bypass the fetch that we
365 * really need to perform. Claiming failure now will ensure
366 * we perform the network exchange to deepen our history.
367 */
368 if (depth)
369 return -1;
370 for (i = 0, ref = ref_map; ref; ref = ref->next)
372 i++;
373 if (!i)
374 return 0;
375 argv = xmalloc(sizeof(*argv) * (i + 6));
377 i = 0;
378 argv[i++] = xstrdup("rev-list");
379 argv[i++] = xstrdup("--quiet");
380 argv[i++] = xstrdup("--objects");
381 for (ref = ref_map; ref; ref = ref->next)
382 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
383 argv[i++] = xstrdup("--not");
384 argv[i++] = xstrdup("--all");
385 argv[i++] = NULL;
386 memset(&revlist, 0, sizeof(revlist));
388 revlist.argv = (const char**)argv;
389 revlist.git_cmd = 1;
390 revlist.no_stdin = 1;
391 revlist.no_stdout = 1;
392 revlist.no_stderr = 1;
393 err = run_command(&revlist);
394 for (i = 0; argv[i]; i++)
396 free(argv[i]);
397 free(argv);
398 return err;
399}
400static int fetch_refs(struct transport *transport, struct ref *ref_map)
402{
403 int ret = quickfetch(ref_map);
404 if (ret)
405 ret = transport_fetch_refs(transport, ref_map);
406 if (!ret)
407 store_updated_refs(transport->url, ref_map);
408 transport_unlock_pack(transport);
409 return ret;
410}
411static int add_existing(const char *refname, const unsigned char *sha1,
413 int flag, void *cbdata)
414{
415 struct path_list *list = (struct path_list *)cbdata;
416 path_list_insert(refname, list);
417 return 0;
418}
419static struct ref *find_non_local_tags(struct transport *transport,
421 struct ref *fetch_map)
422{
423 static struct path_list existing_refs = { NULL, 0, 0, 0 };
424 struct path_list new_refs = { NULL, 0, 0, 1 };
425 char *ref_name;
426 int ref_name_len;
427 unsigned char *ref_sha1;
428 struct ref *tag_ref;
429 struct ref *rm = NULL;
430 struct ref *ref_map = NULL;
431 struct ref **tail = &ref_map;
432 struct ref *ref;
433 for_each_ref(add_existing, &existing_refs);
435 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
436 if (prefixcmp(ref->name, "refs/tags"))
437 continue;
438 ref_name = xstrdup(ref->name);
440 ref_name_len = strlen(ref_name);
441 ref_sha1 = ref->old_sha1;
442 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
444 ref_name[ref_name_len - 3] = 0;
445 tag_ref = transport_get_remote_refs(transport);
446 while (tag_ref) {
447 if (!strcmp(tag_ref->name, ref_name)) {
448 ref_sha1 = tag_ref->old_sha1;
449 break;
450 }
451 tag_ref = tag_ref->next;
452 }
453 }
454 if (!path_list_has_path(&existing_refs, ref_name) &&
456 !path_list_has_path(&new_refs, ref_name) &&
457 has_sha1_file(ref->old_sha1)) {
458 path_list_insert(ref_name, &new_refs);
459 rm = alloc_ref(strlen(ref_name) + 1);
461 strcpy(rm->name, ref_name);
462 rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
463 strcpy(rm->peer_ref->name, ref_name);
464 hashcpy(rm->old_sha1, ref_sha1);
465 *tail = rm;
467 tail = &rm->next;
468 }
469 free(ref_name);
470 }
471 return ref_map;
473}
474static int do_fetch(struct transport *transport,
476 struct refspec *refs, int ref_count)
477{
478 struct ref *ref_map, *fetch_map;
479 struct ref *rm;
480 int autotags = (transport->remote->fetch_tags == 1);
481 if (transport->remote->fetch_tags == 2 && !no_tags)
482 tags = 1;
483 if (transport->remote->fetch_tags == -1)
484 no_tags = 1;
485 if (!transport->get_refs_list || !transport->fetch)
487 die("Don't know how to fetch from %s", transport->url);
488 /* if not appending, truncate FETCH_HEAD */
490 if (!append)
491 fclose(fopen(git_path("FETCH_HEAD"), "w"));
492 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
494 for (rm = ref_map; rm; rm = rm->next) {
496 if (rm->peer_ref)
497 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
498 }
499 if (fetch_refs(transport, ref_map)) {
501 free_refs(ref_map);
502 return 1;
503 }
504 fetch_map = ref_map;
506 /* if neither --no-tags nor --tags was specified, do automated tag
508 * following ... */
509 if (!(tags || no_tags) && autotags) {
510 ref_map = find_non_local_tags(transport, fetch_map);
511 if (ref_map) {
512 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
513 fetch_refs(transport, ref_map);
514 }
515 free_refs(ref_map);
516 }
517 free_refs(fetch_map);
519 return 0;
521}
522static void set_option(const char *name, const char *value)
524{
525 int r = transport_set_option(transport, name, value);
526 if (r < 0)
527 die("Option \"%s\" value \"%s\" is not valid for %s\n",
528 name, value, transport->url);
529 if (r > 0)
530 warning("Option \"%s\" is ignored for %s\n",
531 name, transport->url);
532}
533int cmd_fetch(int argc, const char **argv, const char *prefix)
535{
536 struct remote *remote;
537 int i, j, rla_offset;
538 static const char **refs = NULL;
539 int ref_nr = 0;
540 int cmd_len = 0;
541 const char *upload_pack = NULL;
542 int keep = 0;
543 for (i = 1; i < argc; i++) {
545 const char *arg = argv[i];
546 cmd_len += strlen(arg);
547 if (arg[0] != '-')
549 break;
550 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
551 append = 1;
552 continue;
553 }
554 if (!prefixcmp(arg, "--upload-pack=")) {
555 upload_pack = arg + 14;
556 continue;
557 }
558 if (!strcmp(arg, "--upload-pack")) {
559 i++;
560 if (i == argc)
561 usage(fetch_usage);
562 upload_pack = argv[i];
563 continue;
564 }
565 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
566 force = 1;
567 continue;
568 }
569 if (!strcmp(arg, "--no-tags")) {
570 no_tags = 1;
571 continue;
572 }
573 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
574 tags = 1;
575 continue;
576 }
577 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
578 keep = 1;
579 continue;
580 }
581 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
582 update_head_ok = 1;
583 continue;
584 }
585 if (!prefixcmp(arg, "--depth=")) {
586 depth = arg + 8;
587 continue;
588 }
589 if (!strcmp(arg, "--depth")) {
590 i++;
591 if (i == argc)
592 usage(fetch_usage);
593 depth = argv[i];
594 continue;
595 }
596 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
597 quiet = 1;
598 continue;
599 }
600 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
601 verbose++;
602 continue;
603 }
604 usage(fetch_usage);
605 }
606 for (j = i; j < argc; j++)
608 cmd_len += strlen(argv[j]);
609 default_rla = xmalloc(cmd_len + 5 + argc + 1);
611 sprintf(default_rla, "fetch");
612 rla_offset = strlen(default_rla);
613 for (j = 1; j < argc; j++) {
614 sprintf(default_rla + rla_offset, " %s", argv[j]);
615 rla_offset += strlen(argv[j]) + 1;
616 }
617 if (i == argc)
619 remote = remote_get(NULL);
620 else
621 remote = remote_get(argv[i++]);
622 transport = transport_get(remote, remote->url[0]);
624 if (verbose >= 2)
625 transport->verbose = 1;
626 if (quiet)
627 transport->verbose = -1;
628 if (upload_pack)
629 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
630 if (keep)
631 set_option(TRANS_OPT_KEEP, "yes");
632 if (depth)
633 set_option(TRANS_OPT_DEPTH, depth);
634 if (!transport->url)
636 die("Where do you want to fetch from today?");
637 if (i < argc) {
639 int j = 0;
640 refs = xcalloc(argc - i + 1, sizeof(const char *));
641 while (i < argc) {
642 if (!strcmp(argv[i], "tag")) {
643 char *ref;
644 i++;
645 ref = xmalloc(strlen(argv[i]) * 2 + 22);
646 strcpy(ref, "refs/tags/");
647 strcat(ref, argv[i]);
648 strcat(ref, ":refs/tags/");
649 strcat(ref, argv[i]);
650 refs[j++] = ref;
651 } else
652 refs[j++] = argv[i];
653 i++;
654 }
655 refs[j] = NULL;
656 ref_nr = j;
657 }
658 signal(SIGINT, unlock_pack_on_signal);
660 atexit(unlock_pack);
661 return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
662}