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_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
44 OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
45 "allow updating of HEAD ref"),
46 OPT_STRING(0, "depth", &depth, "DEPTH",
47 "deepen history of shallow clone"),
48 OPT_END()
49};
50static void unlock_pack(void)
52{
53 if (transport)
54 transport_unlock_pack(transport);
55}
56static void unlock_pack_on_signal(int signo)
58{
59 unlock_pack();
60 signal(SIGINT, SIG_DFL);
61 raise(signo);
62}
63static void add_merge_config(struct ref **head,
65 const struct ref *remote_refs,
66 struct branch *branch,
67 struct ref ***tail)
68{
69 int i;
70 for (i = 0; i < branch->merge_nr; i++) {
72 struct ref *rm, **old_tail = *tail;
73 struct refspec refspec;
74 for (rm = *head; rm; rm = rm->next) {
76 if (branch_merge_matches(branch, i, rm->name)) {
77 rm->merge = 1;
78 break;
79 }
80 }
81 if (rm)
82 continue;
83 /*
85 * Not fetched to a tracking branch? We need to fetch
86 * it anyway to allow this branch's "branch.$name.merge"
87 * to be honored by git-pull, but we do not have to
88 * fail if branch.$name.merge is misconfigured to point
89 * at a nonexisting branch. If we were indeed called by
90 * git-pull, it will notice the misconfiguration because
91 * there is no entry in the resulting FETCH_HEAD marked
92 * for merging.
93 */
94 refspec.src = branch->merge[i]->src;
95 refspec.dst = NULL;
96 refspec.pattern = 0;
97 refspec.force = 0;
98 get_fetch_map(remote_refs, &refspec, tail, 1);
99 for (rm = *old_tail; rm; rm = rm->next)
100 rm->merge = 1;
101 }
102}
103static struct ref *get_ref_map(struct transport *transport,
105 struct refspec *refs, int ref_count, int tags,
106 int *autotags)
107{
108 int i;
109 struct ref *rm;
110 struct ref *ref_map = NULL;
111 struct ref **tail = &ref_map;
112 const struct ref *remote_refs = transport_get_remote_refs(transport);
114 if (ref_count || tags == TAGS_SET) {
116 for (i = 0; i < ref_count; i++) {
117 get_fetch_map(remote_refs, &refs[i], &tail, 0);
118 if (refs[i].dst && refs[i].dst[0])
119 *autotags = 1;
120 }
121 /* Merge everything on the command line, but not --tags */
122 for (rm = ref_map; rm; rm = rm->next)
123 rm->merge = 1;
124 if (tags == TAGS_SET) {
125 struct refspec refspec;
126 refspec.src = "refs/tags/";
127 refspec.dst = "refs/tags/";
128 refspec.pattern = 1;
129 refspec.force = 0;
130 get_fetch_map(remote_refs, &refspec, &tail, 0);
131 }
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 }
161 }
162 ref_remove_duplicates(ref_map);
163 return ref_map;
165}
166static int s_update_ref(const char *action,
168 struct ref *ref,
169 int check_old)
170{
171 char msg[1024];
172 char *rla = getenv("GIT_REFLOG_ACTION");
173 static struct ref_lock *lock;
174 if (!rla)
176 rla = default_rla.buf;
177 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
178 lock = lock_any_ref_for_update(ref->name,
179 check_old ? ref->old_sha1 : NULL, 0);
180 if (!lock)
181 return 1;
182 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
183 return 1;
184 return 0;
185}
186#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
188#define REFCOL_WIDTH 10
189static int update_local_ref(struct ref *ref,
191 const char *remote,
192 int verbose,
193 char *display)
194{
195 struct commit *current = NULL, *updated;
196 enum object_type type;
197 struct branch *current_branch = branch_get(NULL);
198 const char *pretty_ref = ref->name + (
199 !prefixcmp(ref->name, "refs/heads/") ? 11 :
200 !prefixcmp(ref->name, "refs/tags/") ? 10 :
201 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
202 0);
203 *display = 0;
205 type = sha1_object_info(ref->new_sha1, NULL);
206 if (type < 0)
207 die("object %s not found", sha1_to_hex(ref->new_sha1));
208 if (!*ref->name) {
210 /* Not storing */
211 if (verbose)
212 sprintf(display, "* branch %s -> FETCH_HEAD", remote);
213 return 0;
214 }
215 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
217 if (verbose)
218 sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
219 "[up to date]", REFCOL_WIDTH, remote,
220 pretty_ref);
221 return 0;
222 }
223 if (current_branch &&
225 !strcmp(ref->name, current_branch->name) &&
226 !(update_head_ok || is_bare_repository()) &&
227 !is_null_sha1(ref->old_sha1)) {
228 /*
229 * If this is the head, and it's not okay to update
230 * the head, and the old value of the head isn't empty...
231 */
232 sprintf(display, "! %-*s %-*s -> %s (can't fetch in current branch)",
233 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
234 pretty_ref);
235 return 1;
236 }
237 if (!is_null_sha1(ref->old_sha1) &&
239 !prefixcmp(ref->name, "refs/tags/")) {
240 sprintf(display, "- %-*s %-*s -> %s",
241 SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
242 pretty_ref);
243 return s_update_ref("updating tag", ref, 0);
244 }
245 current = lookup_commit_reference_gently(ref->old_sha1, 1);
247 updated = lookup_commit_reference_gently(ref->new_sha1, 1);
248 if (!current || !updated) {
249 const char *msg;
250 const char *what;
251 if (!strncmp(ref->name, "refs/tags/", 10)) {
252 msg = "storing tag";
253 what = "[new tag]";
254 }
255 else {
256 msg = "storing head";
257 what = "[new branch]";
258 }
259 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
261 REFCOL_WIDTH, remote, pretty_ref);
262 return s_update_ref(msg, ref, 0);
263 }
264 if (in_merge_bases(current, &updated, 1)) {
266 char quickref[83];
267 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
268 strcat(quickref, "..");
269 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
270 sprintf(display, " %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
271 REFCOL_WIDTH, remote, pretty_ref);
272 return s_update_ref("fast forward", ref, 1);
273 } else if (force || ref->force) {
274 char quickref[84];
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 sprintf(display, "+ %-*s %-*s -> %s (forced update)",
279 SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
280 return s_update_ref("forced-update", ref, 1);
281 } else {
282 sprintf(display, "! %-*s %-*s -> %s (non fast forward)",
283 SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
284 pretty_ref);
285 return 1;
286 }
287}
288static int store_updated_refs(const char *url, struct ref *ref_map)
290{
291 FILE *fp;
292 struct commit *commit;
293 int url_len, i, note_len, shown_url = 0;
294 char note[1024];
295 const char *what, *kind;
296 struct ref *rm;
297 char *filename = git_path("FETCH_HEAD");
298 fp = fopen(filename, "a");
300 if (!fp)
301 return error("cannot open %s: %s\n", filename, strerror(errno));
302 for (rm = ref_map; rm; rm = rm->next) {
303 struct ref *ref = NULL;
304 if (rm->peer_ref) {
306 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
307 strcpy(ref->name, rm->peer_ref->name);
308 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
309 hashcpy(ref->new_sha1, rm->old_sha1);
310 ref->force = rm->peer_ref->force;
311 }
312 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
314 if (!commit)
315 rm->merge = 0;
316 if (!strcmp(rm->name, "HEAD")) {
318 kind = "";
319 what = "";
320 }
321 else if (!prefixcmp(rm->name, "refs/heads/")) {
322 kind = "branch";
323 what = rm->name + 11;
324 }
325 else if (!prefixcmp(rm->name, "refs/tags/")) {
326 kind = "tag";
327 what = rm->name + 10;
328 }
329 else if (!prefixcmp(rm->name, "refs/remotes/")) {
330 kind = "remote branch";
331 what = rm->name + 13;
332 }
333 else {
334 kind = "";
335 what = rm->name;
336 }
337 url_len = strlen(url);
339 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
340 ;
341 url_len = i + 1;
342 if (4 < i && !strncmp(".git", url + i - 3, 4))
343 url_len = i - 3;
344 note_len = 0;
346 if (*what) {
347 if (*kind)
348 note_len += sprintf(note + note_len, "%s ",
349 kind);
350 note_len += sprintf(note + note_len, "'%s' of ", what);
351 }
352 note_len += sprintf(note + note_len, "%.*s", url_len, url);
353 fprintf(fp, "%s\t%s\t%s\n",
354 sha1_to_hex(commit ? commit->object.sha1 :
355 rm->old_sha1),
356 rm->merge ? "" : "not-for-merge",
357 note);
358 if (ref) {
360 update_local_ref(ref, what, verbose, note);
361 if (*note) {
362 if (!shown_url) {
363 fprintf(stderr, "From %.*s\n",
364 url_len, url);
365 shown_url = 1;
366 }
367 fprintf(stderr, " %s\n", note);
368 }
369 }
370 }
371 fclose(fp);
372 return 0;
373}
374/*
376 * We would want to bypass the object transfer altogether if
377 * everything we are going to fetch already exists and connected
378 * locally.
379 *
380 * The refs we are going to fetch are in to_fetch (nr_heads in
381 * total). If running
382 *
383 * $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
384 *
385 * does not error out, that means everything reachable from the
386 * refs we are going to fetch exists and is connected to some of
387 * our existing refs.
388 */
389static int quickfetch(struct ref *ref_map)
390{
391 struct child_process revlist;
392 struct ref *ref;
393 char **argv;
394 int i, err;
395 /*
397 * If we are deepening a shallow clone we already have these
398 * objects reachable. Running rev-list here will return with
399 * a good (0) exit status and we'll bypass the fetch that we
400 * really need to perform. Claiming failure now will ensure
401 * we perform the network exchange to deepen our history.
402 */
403 if (depth)
404 return -1;
405 for (i = 0, ref = ref_map; ref; ref = ref->next)
407 i++;
408 if (!i)
409 return 0;
410 argv = xmalloc(sizeof(*argv) * (i + 6));
412 i = 0;
413 argv[i++] = xstrdup("rev-list");
414 argv[i++] = xstrdup("--quiet");
415 argv[i++] = xstrdup("--objects");
416 for (ref = ref_map; ref; ref = ref->next)
417 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
418 argv[i++] = xstrdup("--not");
419 argv[i++] = xstrdup("--all");
420 argv[i++] = NULL;
421 memset(&revlist, 0, sizeof(revlist));
423 revlist.argv = (const char**)argv;
424 revlist.git_cmd = 1;
425 revlist.no_stdin = 1;
426 revlist.no_stdout = 1;
427 revlist.no_stderr = 1;
428 err = run_command(&revlist);
429 for (i = 0; argv[i]; i++)
431 free(argv[i]);
432 free(argv);
433 return err;
434}
435static int fetch_refs(struct transport *transport, struct ref *ref_map)
437{
438 int ret = quickfetch(ref_map);
439 if (ret)
440 ret = transport_fetch_refs(transport, ref_map);
441 if (!ret)
442 ret |= store_updated_refs(transport->url, ref_map);
443 transport_unlock_pack(transport);
444 return ret;
445}
446static int add_existing(const char *refname, const unsigned char *sha1,
448 int flag, void *cbdata)
449{
450 struct path_list *list = (struct path_list *)cbdata;
451 path_list_insert(refname, list);
452 return 0;
453}
454static struct ref *find_non_local_tags(struct transport *transport,
456 struct ref *fetch_map)
457{
458 static struct path_list existing_refs = { NULL, 0, 0, 0 };
459 struct path_list new_refs = { NULL, 0, 0, 1 };
460 char *ref_name;
461 int ref_name_len;
462 const unsigned char *ref_sha1;
463 const struct ref *tag_ref;
464 struct ref *rm = NULL;
465 struct ref *ref_map = NULL;
466 struct ref **tail = &ref_map;
467 const struct ref *ref;
468 for_each_ref(add_existing, &existing_refs);
470 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
471 if (prefixcmp(ref->name, "refs/tags"))
472 continue;
473 ref_name = xstrdup(ref->name);
475 ref_name_len = strlen(ref_name);
476 ref_sha1 = ref->old_sha1;
477 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
479 ref_name[ref_name_len - 3] = 0;
480 tag_ref = transport_get_remote_refs(transport);
481 while (tag_ref) {
482 if (!strcmp(tag_ref->name, ref_name)) {
483 ref_sha1 = tag_ref->old_sha1;
484 break;
485 }
486 tag_ref = tag_ref->next;
487 }
488 }
489 if (!path_list_has_path(&existing_refs, ref_name) &&
491 !path_list_has_path(&new_refs, ref_name) &&
492 has_sha1_file(ref->old_sha1)) {
493 path_list_insert(ref_name, &new_refs);
494 rm = alloc_ref(strlen(ref_name) + 1);
496 strcpy(rm->name, ref_name);
497 rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
498 strcpy(rm->peer_ref->name, ref_name);
499 hashcpy(rm->old_sha1, ref_sha1);
500 *tail = rm;
502 tail = &rm->next;
503 }
504 free(ref_name);
505 }
506 return ref_map;
508}
509static int do_fetch(struct transport *transport,
511 struct refspec *refs, int ref_count)
512{
513 struct ref *ref_map, *fetch_map;
514 struct ref *rm;
515 int autotags = (transport->remote->fetch_tags == 1);
516 if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
517 tags = TAGS_SET;
518 if (transport->remote->fetch_tags == -1)
519 tags = TAGS_UNSET;
520 if (!transport->get_refs_list || !transport->fetch)
522 die("Don't know how to fetch from %s", transport->url);
523 /* if not appending, truncate FETCH_HEAD */
525 if (!append) {
526 char *filename = git_path("FETCH_HEAD");
527 FILE *fp = fopen(filename, "w");
528 if (!fp)
529 return error("cannot open %s: %s\n", filename, strerror(errno));
530 fclose(fp);
531 }
532 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
534 for (rm = ref_map; rm; rm = rm->next) {
536 if (rm->peer_ref)
537 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
538 }
539 if (fetch_refs(transport, ref_map)) {
541 free_refs(ref_map);
542 return 1;
543 }
544 fetch_map = ref_map;
546 /* if neither --no-tags nor --tags was specified, do automated tag
548 * following ... */
549 if (tags == TAGS_DEFAULT && autotags) {
550 ref_map = find_non_local_tags(transport, fetch_map);
551 if (ref_map) {
552 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
553 fetch_refs(transport, ref_map);
554 }
555 free_refs(ref_map);
556 }
557 free_refs(fetch_map);
559 return 0;
561}
562static void set_option(const char *name, const char *value)
564{
565 int r = transport_set_option(transport, name, value);
566 if (r < 0)
567 die("Option \"%s\" value \"%s\" is not valid for %s\n",
568 name, value, transport->url);
569 if (r > 0)
570 warning("Option \"%s\" is ignored for %s\n",
571 name, transport->url);
572}
573int cmd_fetch(int argc, const char **argv, const char *prefix)
575{
576 struct remote *remote;
577 int i;
578 static const char **refs = NULL;
579 int ref_nr = 0;
580 /* Record the command line for the reflog */
582 strbuf_addstr(&default_rla, "fetch");
583 for (i = 1; i < argc; i++)
584 strbuf_addf(&default_rla, " %s", argv[i]);
585 argc = parse_options(argc, argv,
587 builtin_fetch_options, builtin_fetch_usage, 0);
588 if (argc == 0)
590 remote = remote_get(NULL);
591 else
592 remote = remote_get(argv[0]);
593 transport = transport_get(remote, remote->url[0]);
595 if (verbose >= 2)
596 transport->verbose = 1;
597 if (quiet)
598 transport->verbose = -1;
599 if (upload_pack)
600 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
601 if (keep)
602 set_option(TRANS_OPT_KEEP, "yes");
603 if (depth)
604 set_option(TRANS_OPT_DEPTH, depth);
605 if (!transport->url)
607 die("Where do you want to fetch from today?");
608 if (argc > 1) {
610 int j = 0;
611 refs = xcalloc(argc + 1, sizeof(const char *));
612 for (i = 1; i < argc; i++) {
613 if (!strcmp(argv[i], "tag")) {
614 char *ref;
615 i++;
616 ref = xmalloc(strlen(argv[i]) * 2 + 22);
617 strcpy(ref, "refs/tags/");
618 strcat(ref, argv[i]);
619 strcat(ref, ":refs/tags/");
620 strcat(ref, argv[i]);
621 refs[j++] = ref;
622 } else
623 refs[j++] = argv[i];
624 }
625 refs[j] = NULL;
626 ref_nr = j;
627 }
628 signal(SIGINT, unlock_pack_on_signal);
630 atexit(unlock_pack);
631 return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
632}