git-commit: Allow to amend a merge commit that does not change the tree
[alt-git.git] / builtin-fetch.c
blobde9947e7ac2cc1236909fab813198b3df93bd39e
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"
13 static 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>...]";
15 static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
16 static const char *depth;
17 static char *default_rla = NULL;
18 static struct transport *transport;
20 static void unlock_pack(void)
22 if (transport)
23 transport_unlock_pack(transport);
26 static void unlock_pack_on_signal(int signo)
28 unlock_pack();
29 signal(SIGINT, SIG_DFL);
30 raise(signo);
33 static void add_merge_config(struct ref **head,
34 const struct ref *remote_refs,
35 struct branch *branch,
36 struct ref ***tail)
38 int i;
40 for (i = 0; i < branch->merge_nr; i++) {
41 struct ref *rm, **old_tail = *tail;
42 struct refspec refspec;
44 for (rm = *head; rm; rm = rm->next) {
45 if (branch_merge_matches(branch, i, rm->name)) {
46 rm->merge = 1;
47 break;
50 if (rm)
51 continue;
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.
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;
73 static struct ref *get_ref_map(struct transport *transport,
74 struct refspec *refs, int ref_count, int tags,
75 int *autotags)
77 int i;
78 struct ref *rm;
79 struct ref *ref_map = NULL;
80 struct ref **tail = &ref_map;
82 const struct ref *remote_refs = transport_get_remote_refs(transport);
84 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;
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);
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;
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.
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;
131 ref_remove_duplicates(ref_map);
133 return ref_map;
136 static int s_update_ref(const char *action,
137 struct ref *ref,
138 int check_old)
140 char msg[1024];
141 char *rla = getenv("GIT_REFLOG_ACTION");
142 static struct ref_lock *lock;
144 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;
156 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
157 #define REFCOL_WIDTH 10
159 static int update_local_ref(struct ref *ref,
160 const char *remote,
161 int verbose,
162 char *display)
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 :
173 *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));
178 if (!*ref->name) {
179 /* Not storing */
180 if (verbose)
181 sprintf(display, "* branch %s -> FETCH_HEAD", remote);
182 return 0;
185 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;
193 if (current_branch &&
194 !strcmp(ref->name, current_branch->name) &&
195 !(update_head_ok || is_bare_repository()) &&
196 !is_null_sha1(ref->old_sha1)) {
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...
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;
207 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);
215 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]";
224 else {
225 msg = "storing head";
226 what = "[new branch]";
229 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
230 REFCOL_WIDTH, remote, pretty_ref);
231 return s_update_ref(msg, ref, 0);
234 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;
258 static int store_updated_refs(const char *url, struct ref *ref_map)
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 char *filename = git_path("FETCH_HEAD");
268 fp = fopen(filename, "a");
269 if (!fp)
270 return error("cannot open %s: %s\n", filename, strerror(errno));
271 for (rm = ref_map; rm; rm = rm->next) {
272 struct ref *ref = NULL;
274 if (rm->peer_ref) {
275 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
276 strcpy(ref->name, rm->peer_ref->name);
277 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
278 hashcpy(ref->new_sha1, rm->old_sha1);
279 ref->force = rm->peer_ref->force;
282 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
283 if (!commit)
284 rm->merge = 0;
286 if (!strcmp(rm->name, "HEAD")) {
287 kind = "";
288 what = "";
290 else if (!prefixcmp(rm->name, "refs/heads/")) {
291 kind = "branch";
292 what = rm->name + 11;
294 else if (!prefixcmp(rm->name, "refs/tags/")) {
295 kind = "tag";
296 what = rm->name + 10;
298 else if (!prefixcmp(rm->name, "refs/remotes/")) {
299 kind = "remote branch";
300 what = rm->name + 13;
302 else {
303 kind = "";
304 what = rm->name;
307 url_len = strlen(url);
308 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
310 url_len = i + 1;
311 if (4 < i && !strncmp(".git", url + i - 3, 4))
312 url_len = i - 3;
314 note_len = 0;
315 if (*what) {
316 if (*kind)
317 note_len += sprintf(note + note_len, "%s ",
318 kind);
319 note_len += sprintf(note + note_len, "'%s' of ", what);
321 note_len += sprintf(note + note_len, "%.*s", url_len, url);
322 fprintf(fp, "%s\t%s\t%s\n",
323 sha1_to_hex(commit ? commit->object.sha1 :
324 rm->old_sha1),
325 rm->merge ? "" : "not-for-merge",
326 note);
328 if (ref) {
329 update_local_ref(ref, what, verbose, note);
330 if (*note) {
331 if (!shown_url) {
332 fprintf(stderr, "From %.*s\n",
333 url_len, url);
334 shown_url = 1;
336 fprintf(stderr, " %s\n", note);
340 fclose(fp);
341 return 0;
345 * We would want to bypass the object transfer altogether if
346 * everything we are going to fetch already exists and connected
347 * locally.
349 * The refs we are going to fetch are in to_fetch (nr_heads in
350 * total). If running
352 * $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
354 * does not error out, that means everything reachable from the
355 * refs we are going to fetch exists and is connected to some of
356 * our existing refs.
358 static int quickfetch(struct ref *ref_map)
360 struct child_process revlist;
361 struct ref *ref;
362 char **argv;
363 int i, err;
366 * If we are deepening a shallow clone we already have these
367 * objects reachable. Running rev-list here will return with
368 * a good (0) exit status and we'll bypass the fetch that we
369 * really need to perform. Claiming failure now will ensure
370 * we perform the network exchange to deepen our history.
372 if (depth)
373 return -1;
375 for (i = 0, ref = ref_map; ref; ref = ref->next)
376 i++;
377 if (!i)
378 return 0;
380 argv = xmalloc(sizeof(*argv) * (i + 6));
381 i = 0;
382 argv[i++] = xstrdup("rev-list");
383 argv[i++] = xstrdup("--quiet");
384 argv[i++] = xstrdup("--objects");
385 for (ref = ref_map; ref; ref = ref->next)
386 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
387 argv[i++] = xstrdup("--not");
388 argv[i++] = xstrdup("--all");
389 argv[i++] = NULL;
391 memset(&revlist, 0, sizeof(revlist));
392 revlist.argv = (const char**)argv;
393 revlist.git_cmd = 1;
394 revlist.no_stdin = 1;
395 revlist.no_stdout = 1;
396 revlist.no_stderr = 1;
397 err = run_command(&revlist);
399 for (i = 0; argv[i]; i++)
400 free(argv[i]);
401 free(argv);
402 return err;
405 static int fetch_refs(struct transport *transport, struct ref *ref_map)
407 int ret = quickfetch(ref_map);
408 if (ret)
409 ret = transport_fetch_refs(transport, ref_map);
410 if (!ret)
411 ret |= store_updated_refs(transport->url, ref_map);
412 transport_unlock_pack(transport);
413 return ret;
416 static int add_existing(const char *refname, const unsigned char *sha1,
417 int flag, void *cbdata)
419 struct path_list *list = (struct path_list *)cbdata;
420 path_list_insert(refname, list);
421 return 0;
424 static struct ref *find_non_local_tags(struct transport *transport,
425 struct ref *fetch_map)
427 static struct path_list existing_refs = { NULL, 0, 0, 0 };
428 struct path_list new_refs = { NULL, 0, 0, 1 };
429 char *ref_name;
430 int ref_name_len;
431 const unsigned char *ref_sha1;
432 const struct ref *tag_ref;
433 struct ref *rm = NULL;
434 struct ref *ref_map = NULL;
435 struct ref **tail = &ref_map;
436 const struct ref *ref;
438 for_each_ref(add_existing, &existing_refs);
439 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
440 if (prefixcmp(ref->name, "refs/tags"))
441 continue;
443 ref_name = xstrdup(ref->name);
444 ref_name_len = strlen(ref_name);
445 ref_sha1 = ref->old_sha1;
447 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
448 ref_name[ref_name_len - 3] = 0;
449 tag_ref = transport_get_remote_refs(transport);
450 while (tag_ref) {
451 if (!strcmp(tag_ref->name, ref_name)) {
452 ref_sha1 = tag_ref->old_sha1;
453 break;
455 tag_ref = tag_ref->next;
459 if (!path_list_has_path(&existing_refs, ref_name) &&
460 !path_list_has_path(&new_refs, ref_name) &&
461 has_sha1_file(ref->old_sha1)) {
462 path_list_insert(ref_name, &new_refs);
464 rm = alloc_ref(strlen(ref_name) + 1);
465 strcpy(rm->name, ref_name);
466 rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
467 strcpy(rm->peer_ref->name, ref_name);
468 hashcpy(rm->old_sha1, ref_sha1);
470 *tail = rm;
471 tail = &rm->next;
473 free(ref_name);
476 return ref_map;
479 static int do_fetch(struct transport *transport,
480 struct refspec *refs, int ref_count)
482 struct ref *ref_map, *fetch_map;
483 struct ref *rm;
484 int autotags = (transport->remote->fetch_tags == 1);
485 if (transport->remote->fetch_tags == 2 && !no_tags)
486 tags = 1;
487 if (transport->remote->fetch_tags == -1)
488 no_tags = 1;
490 if (!transport->get_refs_list || !transport->fetch)
491 die("Don't know how to fetch from %s", transport->url);
493 /* if not appending, truncate FETCH_HEAD */
494 if (!append) {
495 char *filename = git_path("FETCH_HEAD");
496 FILE *fp = fopen(filename, "w");
497 if (!fp)
498 return error("cannot open %s: %s\n", filename, strerror(errno));
499 fclose(fp);
502 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
504 for (rm = ref_map; rm; rm = rm->next) {
505 if (rm->peer_ref)
506 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
509 if (fetch_refs(transport, ref_map)) {
510 free_refs(ref_map);
511 return 1;
514 fetch_map = ref_map;
516 /* if neither --no-tags nor --tags was specified, do automated tag
517 * following ... */
518 if (!(tags || no_tags) && autotags) {
519 ref_map = find_non_local_tags(transport, fetch_map);
520 if (ref_map) {
521 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
522 fetch_refs(transport, ref_map);
524 free_refs(ref_map);
527 free_refs(fetch_map);
529 return 0;
532 static void set_option(const char *name, const char *value)
534 int r = transport_set_option(transport, name, value);
535 if (r < 0)
536 die("Option \"%s\" value \"%s\" is not valid for %s\n",
537 name, value, transport->url);
538 if (r > 0)
539 warning("Option \"%s\" is ignored for %s\n",
540 name, transport->url);
543 int cmd_fetch(int argc, const char **argv, const char *prefix)
545 struct remote *remote;
546 int i, j, rla_offset;
547 static const char **refs = NULL;
548 int ref_nr = 0;
549 int cmd_len = 0;
550 const char *upload_pack = NULL;
551 int keep = 0;
553 for (i = 1; i < argc; i++) {
554 const char *arg = argv[i];
555 cmd_len += strlen(arg);
557 if (arg[0] != '-')
558 break;
559 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
560 append = 1;
561 continue;
563 if (!prefixcmp(arg, "--upload-pack=")) {
564 upload_pack = arg + 14;
565 continue;
567 if (!strcmp(arg, "--upload-pack")) {
568 i++;
569 if (i == argc)
570 usage(fetch_usage);
571 upload_pack = argv[i];
572 continue;
574 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
575 force = 1;
576 continue;
578 if (!strcmp(arg, "--no-tags")) {
579 no_tags = 1;
580 continue;
582 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
583 tags = 1;
584 continue;
586 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
587 keep = 1;
588 continue;
590 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
591 update_head_ok = 1;
592 continue;
594 if (!prefixcmp(arg, "--depth=")) {
595 depth = arg + 8;
596 continue;
598 if (!strcmp(arg, "--depth")) {
599 i++;
600 if (i == argc)
601 usage(fetch_usage);
602 depth = argv[i];
603 continue;
605 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
606 quiet = 1;
607 continue;
609 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
610 verbose++;
611 continue;
613 usage(fetch_usage);
616 for (j = i; j < argc; j++)
617 cmd_len += strlen(argv[j]);
619 default_rla = xmalloc(cmd_len + 5 + argc + 1);
620 sprintf(default_rla, "fetch");
621 rla_offset = strlen(default_rla);
622 for (j = 1; j < argc; j++) {
623 sprintf(default_rla + rla_offset, " %s", argv[j]);
624 rla_offset += strlen(argv[j]) + 1;
627 if (i == argc)
628 remote = remote_get(NULL);
629 else
630 remote = remote_get(argv[i++]);
632 transport = transport_get(remote, remote->url[0]);
633 if (verbose >= 2)
634 transport->verbose = 1;
635 if (quiet)
636 transport->verbose = -1;
637 if (upload_pack)
638 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
639 if (keep)
640 set_option(TRANS_OPT_KEEP, "yes");
641 if (depth)
642 set_option(TRANS_OPT_DEPTH, depth);
644 if (!transport->url)
645 die("Where do you want to fetch from today?");
647 if (i < argc) {
648 int j = 0;
649 refs = xcalloc(argc - i + 1, sizeof(const char *));
650 while (i < argc) {
651 if (!strcmp(argv[i], "tag")) {
652 char *ref;
653 i++;
654 ref = xmalloc(strlen(argv[i]) * 2 + 22);
655 strcpy(ref, "refs/tags/");
656 strcat(ref, argv[i]);
657 strcat(ref, ":refs/tags/");
658 strcat(ref, argv[i]);
659 refs[j++] = ref;
660 } else
661 refs[j++] = argv[i];
662 i++;
664 refs[j] = NULL;
665 ref_nr = j;
668 signal(SIGINT, unlock_pack_on_signal);
669 atexit(unlock_pack);
670 return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);