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"
12#include "parse-options.h"
13static const char * const builtin_fetch_usage[] = {
15 "git-fetch [options] [<repository> <refspec>...]",
16 NULL
17};
18enum {
20 TAGS_UNSET = 0,
21 TAGS_DEFAULT = 1,
22 TAGS_SET = 2
23};
24static int append, force, keep, update_head_ok, verbose, quiet;
26static int tags = TAGS_DEFAULT;
27static const char *depth;
28static const char *upload_pack;
29static struct strbuf default_rla = STRBUF_INIT;
30static struct transport *transport;
31static struct option builtin_fetch_options[] = {
33 OPT__QUIET(&quiet),
34 OPT__VERBOSE(&verbose),
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 signal(SIGINT, SIG_DFL);
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 1;
185 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
186 return 1;
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 int verbose,
196 char *display)
197{
198 struct commit *current = NULL, *updated;
199 enum object_type type;
200 struct branch *current_branch = branch_get(NULL);
201 const char *pretty_ref = ref->name + (
202 !prefixcmp(ref->name, "refs/heads/") ? 11 :
203 !prefixcmp(ref->name, "refs/tags/") ? 10 :
204 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
205 0);
206 *display = 0;
208 type = sha1_object_info(ref->new_sha1, NULL);
209 if (type < 0)
210 die("object %s not found", sha1_to_hex(ref->new_sha1));
211 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
213 if (verbose)
214 sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
215 "[up to date]", REFCOL_WIDTH, remote,
216 pretty_ref);
217 return 0;
218 }
219 if (current_branch &&
221 !strcmp(ref->name, current_branch->name) &&
222 !(update_head_ok || is_bare_repository()) &&
223 !is_null_sha1(ref->old_sha1)) {
224 /*
225 * If this is the head, and it's not okay to update
226 * the head, and the old value of the head isn't empty...
227 */
228 sprintf(display, "! %-*s %-*s -> %s (can't fetch in current branch)",
229 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
230 pretty_ref);
231 return 1;
232 }
233 if (!is_null_sha1(ref->old_sha1) &&
235 !prefixcmp(ref->name, "refs/tags/")) {
236 sprintf(display, "- %-*s %-*s -> %s",
237 SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
238 pretty_ref);
239 return s_update_ref("updating tag", ref, 0);
240 }
241 current = lookup_commit_reference_gently(ref->old_sha1, 1);
243 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
244 if (!current || !updated) {
245 const char *msg;
246 const char *what;
247 if (!strncmp(ref->name, "refs/tags/", 10)) {
248 msg = "storing tag";
249 what = "[new tag]";
250 }
251 else {
252 msg = "storing head";
253 what = "[new branch]";
254 }
255 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
257 REFCOL_WIDTH, remote, pretty_ref);
258 return s_update_ref(msg, ref, 0);
259 }
260 if (in_merge_bases(current, &updated, 1)) {
262 char quickref[83];
263 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
264 strcat(quickref, "..");
265 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
266 sprintf(display, " %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
267 REFCOL_WIDTH, remote, pretty_ref);
268 return s_update_ref("fast forward", ref, 1);
269 } else if (force || ref->force) {
270 char quickref[84];
271 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
272 strcat(quickref, "...");
273 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
274 sprintf(display, "+ %-*s %-*s -> %s (forced update)",
275 SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
276 return s_update_ref("forced-update", ref, 1);
277 } else {
278 sprintf(display, "! %-*s %-*s -> %s (non fast forward)",
279 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
280 pretty_ref);
281 return 1;
282 }
283}
284static int store_updated_refs(const char *url, struct ref *ref_map)
286{
287 FILE *fp;
288 struct commit *commit;
289 int url_len, i, note_len, shown_url = 0;
290 char note[1024];
291 const char *what, *kind;
292 struct ref *rm;
293 char *filename = git_path("FETCH_HEAD");
294 fp = fopen(filename, "a");
296 if (!fp)
297 return error("cannot open %s: %s\n", filename, strerror(errno));
298 for (rm = ref_map; rm; rm = rm->next) {
299 struct ref *ref = NULL;
300 if (rm->peer_ref) {
302 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
303 strcpy(ref->name, rm->peer_ref->name);
304 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
305 hashcpy(ref->new_sha1, rm->old_sha1);
306 ref->force = rm->peer_ref->force;
307 }
308 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
310 if (!commit)
311 rm->merge = 0;
312 if (!strcmp(rm->name, "HEAD")) {
314 kind = "";
315 what = "";
316 }
317 else if (!prefixcmp(rm->name, "refs/heads/")) {
318 kind = "branch";
319 what = rm->name + 11;
320 }
321 else if (!prefixcmp(rm->name, "refs/tags/")) {
322 kind = "tag";
323 what = rm->name + 10;
324 }
325 else if (!prefixcmp(rm->name, "refs/remotes/")) {
326 kind = "remote branch";
327 what = rm->name + 13;
328 }
329 else {
330 kind = "";
331 what = rm->name;
332 }
333 url_len = strlen(url);
335 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
336 ;
337 url_len = i + 1;
338 if (4 < i && !strncmp(".git", url + i - 3, 4))
339 url_len = i - 3;
340 note_len = 0;
342 if (*what) {
343 if (*kind)
344 note_len += sprintf(note + note_len, "%s ",
345 kind);
346 note_len += sprintf(note + note_len, "'%s' of ", what);
347 }
348 note_len += sprintf(note + note_len, "%.*s", url_len, url);
349 fprintf(fp, "%s\t%s\t%s\n",
350 sha1_to_hex(commit ? commit->object.sha1 :
351 rm->old_sha1),
352 rm->merge ? "" : "not-for-merge",
353 note);
354 if (ref)
356 update_local_ref(ref, what, verbose, note);
357 else if (verbose)
358 sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
359 SUMMARY_WIDTH, *kind ? kind : "branch",
360 REFCOL_WIDTH, *what ? what : "HEAD");
361 else
362 *note = '\0';
363 if (*note) {
364 if (!shown_url) {
365 fprintf(stderr, "From %.*s\n",
366 url_len, url);
367 shown_url = 1;
368 }
369 fprintf(stderr, " %s\n", note);
370 }
371 }
372 fclose(fp);
373 return 0;
374}
375/*
377 * We would want to bypass the object transfer altogether if
378 * everything we are going to fetch already exists and connected
379 * locally.
380 *
381 * The refs we are going to fetch are in to_fetch (nr_heads in
382 * total). If running
383 *
384 * $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
385 *
386 * does not error out, that means everything reachable from the
387 * refs we are going to fetch exists and is connected to some of
388 * our existing refs.
389 */
390static int quickfetch(struct ref *ref_map)
391{
392 struct child_process revlist;
393 struct ref *ref;
394 char **argv;
395 int i, err;
396 /*
398 * If we are deepening a shallow clone we already have these
399 * objects reachable. Running rev-list here will return with
400 * a good (0) exit status and we'll bypass the fetch that we
401 * really need to perform. Claiming failure now will ensure
402 * we perform the network exchange to deepen our history.
403 */
404 if (depth)
405 return -1;
406 for (i = 0, ref = ref_map; ref; ref = ref->next)
408 i++;
409 if (!i)
410 return 0;
411 argv = xmalloc(sizeof(*argv) * (i + 6));
413 i = 0;
414 argv[i++] = xstrdup("rev-list");
415 argv[i++] = xstrdup("--quiet");
416 argv[i++] = xstrdup("--objects");
417 for (ref = ref_map; ref; ref = ref->next)
418 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
419 argv[i++] = xstrdup("--not");
420 argv[i++] = xstrdup("--all");
421 argv[i++] = NULL;
422 memset(&revlist, 0, sizeof(revlist));
424 revlist.argv = (const char**)argv;
425 revlist.git_cmd = 1;
426 revlist.no_stdin = 1;
427 revlist.no_stdout = 1;
428 revlist.no_stderr = 1;
429 err = run_command(&revlist);
430 for (i = 0; argv[i]; i++)
432 free(argv[i]);
433 free(argv);
434 return err;
435}
436static int fetch_refs(struct transport *transport, struct ref *ref_map)
438{
439 int ret = quickfetch(ref_map);
440 if (ret)
441 ret = transport_fetch_refs(transport, ref_map);
442 if (!ret)
443 ret |= store_updated_refs(transport->url, ref_map);
444 transport_unlock_pack(transport);
445 return ret;
446}
447static int add_existing(const char *refname, const unsigned char *sha1,
449 int flag, void *cbdata)
450{
451 struct path_list *list = (struct path_list *)cbdata;
452 path_list_insert(refname, list);
453 return 0;
454}
455static int will_fetch(struct ref **head, const unsigned char *sha1)
457{
458 struct ref *rm = *head;
459 while (rm) {
460 if (!hashcmp(rm->old_sha1, sha1))
461 return 1;
462 rm = rm->next;
463 }
464 return 0;
465}
466static void find_non_local_tags(struct transport *transport,
468 struct ref **head,
469 struct ref ***tail)
470{
471 struct path_list existing_refs = { NULL, 0, 0, 0 };
472 struct path_list new_refs = { NULL, 0, 0, 1 };
473 char *ref_name;
474 int ref_name_len;
475 const unsigned char *ref_sha1;
476 const struct ref *tag_ref;
477 struct ref *rm = NULL;
478 const struct ref *ref;
479 for_each_ref(add_existing, &existing_refs);
481 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
482 if (prefixcmp(ref->name, "refs/tags"))
483 continue;
484 ref_name = xstrdup(ref->name);
486 ref_name_len = strlen(ref_name);
487 ref_sha1 = ref->old_sha1;
488 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
490 ref_name[ref_name_len - 3] = 0;
491 tag_ref = transport_get_remote_refs(transport);
492 while (tag_ref) {
493 if (!strcmp(tag_ref->name, ref_name)) {
494 ref_sha1 = tag_ref->old_sha1;
495 break;
496 }
497 tag_ref = tag_ref->next;
498 }
499 }
500 if (!path_list_has_path(&existing_refs, ref_name) &&
502 !path_list_has_path(&new_refs, ref_name) &&
503 (has_sha1_file(ref->old_sha1) ||
504 will_fetch(head, ref->old_sha1))) {
505 path_list_insert(ref_name, &new_refs);
506 rm = alloc_ref(strlen(ref_name) + 1);
508 strcpy(rm->name, ref_name);
509 rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
510 strcpy(rm->peer_ref->name, ref_name);
511 hashcpy(rm->old_sha1, ref_sha1);
512 **tail = rm;
514 *tail = &rm->next;
515 }
516 free(ref_name);
517 }
518 path_list_clear(&existing_refs, 0);
519 path_list_clear(&new_refs, 0);
520}
521static int do_fetch(struct transport *transport,
523 struct refspec *refs, int ref_count)
524{
525 struct ref *ref_map;
526 struct ref *rm;
527 int autotags = (transport->remote->fetch_tags == 1);
528 if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
529 tags = TAGS_SET;
530 if (transport->remote->fetch_tags == -1)
531 tags = TAGS_UNSET;
532 if (!transport->get_refs_list || !transport->fetch)
534 die("Don't know how to fetch from %s", transport->url);
535 /* if not appending, truncate FETCH_HEAD */
537 if (!append) {
538 char *filename = git_path("FETCH_HEAD");
539 FILE *fp = fopen(filename, "w");
540 if (!fp)
541 return error("cannot open %s: %s\n", filename, strerror(errno));
542 fclose(fp);
543 }
544 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
546 for (rm = ref_map; rm; rm = rm->next) {
548 if (rm->peer_ref)
549 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
550 }
551 if (tags == TAGS_DEFAULT && autotags)
553 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
554 if (fetch_refs(transport, ref_map)) {
555 free_refs(ref_map);
556 return 1;
557 }
558 free_refs(ref_map);
559 /* if neither --no-tags nor --tags was specified, do automated tag
561 * following ... */
562 if (tags == TAGS_DEFAULT && autotags) {
563 struct ref **tail = &ref_map;
564 ref_map = NULL;
565 find_non_local_tags(transport, &ref_map, &tail);
566 if (ref_map) {
567 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
568 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
569 fetch_refs(transport, ref_map);
570 }
571 free_refs(ref_map);
572 }
573 return 0;
575}
576static void set_option(const char *name, const char *value)
578{
579 int r = transport_set_option(transport, name, value);
580 if (r < 0)
581 die("Option \"%s\" value \"%s\" is not valid for %s\n",
582 name, value, transport->url);
583 if (r > 0)
584 warning("Option \"%s\" is ignored for %s\n",
585 name, transport->url);
586}
587int cmd_fetch(int argc, const char **argv, const char *prefix)
589{
590 struct remote *remote;
591 int i;
592 static const char **refs = NULL;
593 int ref_nr = 0;
594 int exit_code;
595 /* Record the command line for the reflog */
597 strbuf_addstr(&default_rla, "fetch");
598 for (i = 1; i < argc; i++)
599 strbuf_addf(&default_rla, " %s", argv[i]);
600 argc = parse_options(argc, argv,
602 builtin_fetch_options, builtin_fetch_usage, 0);
603 if (argc == 0)
605 remote = remote_get(NULL);
606 else
607 remote = remote_get(argv[0]);
608 transport = transport_get(remote, remote->url[0]);
610 if (verbose >= 2)
611 transport->verbose = 1;
612 if (quiet)
613 transport->verbose = -1;
614 if (upload_pack)
615 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
616 if (keep)
617 set_option(TRANS_OPT_KEEP, "yes");
618 if (depth)
619 set_option(TRANS_OPT_DEPTH, depth);
620 if (!transport->url)
622 die("Where do you want to fetch from today?");
623 if (argc > 1) {
625 int j = 0;
626 refs = xcalloc(argc + 1, sizeof(const char *));
627 for (i = 1; i < argc; i++) {
628 if (!strcmp(argv[i], "tag")) {
629 char *ref;
630 i++;
631 if (i >= argc)
632 die("You need to specify a tag name.");
633 ref = xmalloc(strlen(argv[i]) * 2 + 22);
634 strcpy(ref, "refs/tags/");
635 strcat(ref, argv[i]);
636 strcat(ref, ":refs/tags/");
637 strcat(ref, argv[i]);
638 refs[j++] = ref;
639 } else
640 refs[j++] = argv[i];
641 }
642 refs[j] = NULL;
643 ref_nr = j;
644 }
645 signal(SIGINT, unlock_pack_on_signal);
647 atexit(unlock_pack);
648 exit_code = do_fetch(transport,
649 parse_fetch_refspec(ref_nr, refs), ref_nr);
650 transport_disconnect(transport);
651 transport = NULL;
652 return exit_code;
653}