Refactor index-pack "keep $sha1" handling for reuse
[git/git.git] / builtin-fetch.c
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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
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>...]";
13
14static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
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15static char *default_rla = NULL;
16
17static void find_merge_config(struct ref *ref_map, struct remote *remote)
18{
19 struct ref *rm = ref_map;
20 struct branch *branch = branch_get(NULL);
21
22 for (rm = ref_map; rm; rm = rm->next) {
23 if (!branch_has_merge_config(branch)) {
24 if (remote && remote->fetch &&
25 !strcmp(remote->fetch[0].src, rm->name))
26 rm->merge = 1;
27 } else {
28 if (branch_merges(branch, rm->name))
29 rm->merge = 1;
30 }
31 }
32}
33
34static struct ref *get_ref_map(struct transport *transport,
35 struct refspec *refs, int ref_count, int tags,
36 int *autotags)
37{
38 int i;
39 struct ref *rm;
40 struct ref *ref_map = NULL;
41 struct ref **tail = &ref_map;
42
43 struct ref *remote_refs = transport_get_remote_refs(transport);
44
45 if (ref_count || tags) {
46 for (i = 0; i < ref_count; i++) {
47 get_fetch_map(remote_refs, &refs[i], &tail);
48 if (refs[i].dst && refs[i].dst[0])
49 *autotags = 1;
50 }
51 /* Merge everything on the command line, but not --tags */
52 for (rm = ref_map; rm; rm = rm->next)
53 rm->merge = 1;
54 if (tags) {
55 struct refspec refspec;
56 refspec.src = "refs/tags/";
57 refspec.dst = "refs/tags/";
58 refspec.pattern = 1;
59 refspec.force = 0;
60 get_fetch_map(remote_refs, &refspec, &tail);
61 }
62 } else {
63 /* Use the defaults */
64 struct remote *remote = transport->remote;
65 if (remote->fetch_refspec_nr) {
66 for (i = 0; i < remote->fetch_refspec_nr; i++) {
67 get_fetch_map(remote_refs, &remote->fetch[i], &tail);
68 if (remote->fetch[i].dst &&
69 remote->fetch[i].dst[0])
70 *autotags = 1;
71 }
72 find_merge_config(ref_map, remote);
73 } else {
74 ref_map = get_remote_ref(remote_refs, "HEAD");
75
76 ref_map->merge = 1;
77 }
78 }
79
80 return ref_map;
81}
82
83static void show_new(enum object_type type, unsigned char *sha1_new)
84{
85 fprintf(stderr, " %s: %s\n", typename(type),
86 find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
87}
88
89static int s_update_ref(const char *action,
90 struct ref *ref,
91 int check_old)
92{
93 char msg[1024];
94 char *rla = getenv("GIT_REFLOG_ACTION");
95 static struct ref_lock *lock;
96
97 if (!rla)
98 rla = default_rla;
99 snprintf(msg, sizeof(msg), "%s: %s", rla, action);
100 lock = lock_any_ref_for_update(ref->name,
101 check_old ? ref->old_sha1 : NULL, 0);
102 if (!lock)
103 return 1;
104 if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
105 return 1;
106 return 0;
107}
108
109static int update_local_ref(struct ref *ref,
110 const char *note,
111 int verbose)
112{
113 char oldh[41], newh[41];
114 struct commit *current = NULL, *updated;
115 enum object_type type;
116 struct branch *current_branch = branch_get(NULL);
117
118 type = sha1_object_info(ref->new_sha1, NULL);
119 if (type < 0)
120 die("object %s not found", sha1_to_hex(ref->new_sha1));
121
122 if (!*ref->name) {
123 /* Not storing */
124 if (verbose) {
125 fprintf(stderr, "* fetched %s\n", note);
126 show_new(type, ref->new_sha1);
127 }
128 return 0;
129 }
130
131 if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
132 if (verbose) {
133 fprintf(stderr, "* %s: same as %s\n",
134 ref->name, note);
135 show_new(type, ref->new_sha1);
136 }
137 return 0;
138 }
139
140 if (!strcmp(ref->name, current_branch->name) &&
141 !(update_head_ok || is_bare_repository()) &&
142 !is_null_sha1(ref->old_sha1)) {
143 /*
144 * If this is the head, and it's not okay to update
145 * the head, and the old value of the head isn't empty...
146 */
147 fprintf(stderr,
148 " * %s: Cannot fetch into the current branch.\n",
149 ref->name);
150 return 1;
151 }
152
153 if (!is_null_sha1(ref->old_sha1) &&
154 !prefixcmp(ref->name, "refs/tags/")) {
155 fprintf(stderr, "* %s: updating with %s\n",
156 ref->name, note);
157 show_new(type, ref->new_sha1);
158 return s_update_ref("updating tag", ref, 0);
159 }
160
161 current = lookup_commit_reference(ref->old_sha1);
162 updated = lookup_commit_reference(ref->new_sha1);
163 if (!current || !updated) {
164 char *msg;
165 if (!strncmp(ref->name, "refs/tags/", 10))
166 msg = "storing tag";
167 else
168 msg = "storing head";
169 fprintf(stderr, "* %s: storing %s\n",
170 ref->name, note);
171 show_new(type, ref->new_sha1);
172 return s_update_ref(msg, ref, 0);
173 }
174
175 strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
176 strcpy(newh, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
177
178 if (in_merge_bases(current, &updated, 1)) {
179 fprintf(stderr, "* %s: fast forward to %s\n",
180 ref->name, note);
181 fprintf(stderr, " old..new: %s..%s\n", oldh, newh);
182 return s_update_ref("fast forward", ref, 1);
183 }
184 if (!force && !ref->force) {
185 fprintf(stderr,
186 "* %s: not updating to non-fast forward %s\n",
187 ref->name, note);
188 fprintf(stderr,
189 " old...new: %s...%s\n", oldh, newh);
190 return 1;
191 }
192 fprintf(stderr,
193 "* %s: forcing update to non-fast forward %s\n",
194 ref->name, note);
195 fprintf(stderr, " old...new: %s...%s\n", oldh, newh);
196 return s_update_ref("forced-update", ref, 1);
197}
198
199static void store_updated_refs(const char *url, struct ref *ref_map)
200{
201 FILE *fp;
202 struct commit *commit;
203 int url_len, i, note_len;
204 char note[1024];
205 const char *what, *kind;
206 struct ref *rm;
207
208 fp = fopen(git_path("FETCH_HEAD"), "a");
209 for (rm = ref_map; rm; rm = rm->next) {
210 struct ref *ref = NULL;
211
212 if (rm->peer_ref) {
213 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
214 strcpy(ref->name, rm->peer_ref->name);
215 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
216 hashcpy(ref->new_sha1, rm->old_sha1);
1aad91f5 217 ref->force = rm->peer_ref->force;
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218 }
219
220 commit = lookup_commit_reference(rm->old_sha1);
221 if (!commit)
222 rm->merge = 0;
223
224 if (!strcmp(rm->name, "HEAD")) {
225 kind = "";
226 what = "";
227 }
228 else if (!prefixcmp(rm->name, "refs/heads/")) {
229 kind = "branch";
230 what = rm->name + 11;
231 }
232 else if (!prefixcmp(rm->name, "refs/tags/")) {
233 kind = "tag";
234 what = rm->name + 10;
235 }
236 else if (!prefixcmp(rm->name, "refs/remotes/")) {
237 kind = "remote branch";
238 what = rm->name + 13;
239 }
240 else {
241 kind = "";
242 what = rm->name;
243 }
244
245 url_len = strlen(url);
246 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
247 ;
248 url_len = i + 1;
249 if (4 < i && !strncmp(".git", url + i - 3, 4))
250 url_len = i - 3;
251
252 note_len = 0;
253 if (*what) {
254 if (*kind)
255 note_len += sprintf(note + note_len, "%s ",
256 kind);
257 note_len += sprintf(note + note_len, "'%s' of ", what);
258 }
259 note_len += sprintf(note + note_len, "%.*s", url_len, url);
260 fprintf(fp, "%s\t%s\t%s\n",
261 sha1_to_hex(commit ? commit->object.sha1 :
262 rm->old_sha1),
263 rm->merge ? "" : "not-for-merge",
264 note);
265
266 if (ref)
267 update_local_ref(ref, note, verbose);
268 }
269 fclose(fp);
270}
271
272static int fetch_refs(struct transport *transport, struct ref *ref_map)
273{
274 int ret = transport_fetch_refs(transport, ref_map);
275 if (!ret)
276 store_updated_refs(transport->url, ref_map);
277 return ret;
278}
279
280static int add_existing(const char *refname, const unsigned char *sha1,
281 int flag, void *cbdata)
282{
283 struct path_list *list = (struct path_list *)cbdata;
284 path_list_insert(refname, list);
285 return 0;
286}
287
288static struct ref *find_non_local_tags(struct transport *transport,
289 struct ref *fetch_map)
290{
291 static struct path_list existing_refs = { NULL, 0, 0, 0 };
292 struct path_list new_refs = { NULL, 0, 0, 1 };
293 char *ref_name;
294 int ref_name_len;
295 unsigned char *ref_sha1;
296 struct ref *tag_ref;
297 struct ref *rm = NULL;
298 struct ref *ref_map = NULL;
299 struct ref **tail = &ref_map;
300 struct ref *ref;
301
302 for_each_ref(add_existing, &existing_refs);
303 for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
304 if (prefixcmp(ref->name, "refs/tags"))
305 continue;
306
307 ref_name = xstrdup(ref->name);
308 ref_name_len = strlen(ref_name);
309 ref_sha1 = ref->old_sha1;
310
311 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
312 ref_name[ref_name_len - 3] = 0;
313 tag_ref = transport_get_remote_refs(transport);
314 while (tag_ref) {
315 if (!strcmp(tag_ref->name, ref_name)) {
316 ref_sha1 = tag_ref->old_sha1;
317 break;
318 }
319 tag_ref = tag_ref->next;
320 }
321 }
322
323 if (!path_list_has_path(&existing_refs, ref_name) &&
324 !path_list_has_path(&new_refs, ref_name) &&
325 lookup_object(ref->old_sha1)) {
326 fprintf(stderr, "Auto-following %s\n",
327 ref_name);
328
329 path_list_insert(ref_name, &new_refs);
330
331 rm = alloc_ref(strlen(ref_name) + 1);
332 strcpy(rm->name, ref_name);
333 rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
334 strcpy(rm->peer_ref->name, ref_name);
335 hashcpy(rm->old_sha1, ref_sha1);
336
337 *tail = rm;
338 tail = &rm->next;
339 }
340 free(ref_name);
341 }
342
343 return ref_map;
344}
345
346static int do_fetch(struct transport *transport,
347 struct refspec *refs, int ref_count)
348{
349 struct ref *ref_map, *fetch_map;
350 struct ref *rm;
351 int autotags = (transport->remote->fetch_tags == 1);
352 if (transport->remote->fetch_tags == 2 && !no_tags)
353 tags = 1;
354 if (transport->remote->fetch_tags == -1)
355 no_tags = 1;
356
357 if (!transport->ops || !transport->ops->get_refs_list ||
425b1393 358 !transport->ops->fetch)
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359 die("Don't know how to fetch from %s", transport->url);
360
361 /* if not appending, truncate FETCH_HEAD */
362 if (!append)
363 fclose(fopen(git_path("FETCH_HEAD"), "w"));
364
365 ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
366
367 for (rm = ref_map; rm; rm = rm->next) {
368 if (rm->peer_ref)
369 read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
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370 }
371
372 if (fetch_refs(transport, ref_map)) {
373 free_refs(ref_map);
374 return 1;
375 }
376
377 fetch_map = ref_map;
378
379 /* if neither --no-tags nor --tags was specified, do automated tag
380 * following ... */
381 if (!(tags || no_tags) && autotags) {
382 ref_map = find_non_local_tags(transport, fetch_map);
383 if (ref_map) {
384 transport_set_option(transport, TRANS_OPT_DEPTH, "0");
385 fetch_refs(transport, ref_map);
386 }
387 free_refs(ref_map);
388 }
389
390 free_refs(fetch_map);
391
392 return 0;
393}
394
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395int cmd_fetch(int argc, const char **argv, const char *prefix)
396{
397 struct remote *remote;
398 struct transport *transport;
399 int i, j, rla_offset;
400 static const char **refs = NULL;
401 int ref_nr = 0;
402 int cmd_len = 0;
403 const char *depth = NULL, *upload_pack = NULL;
404 int keep = 0;
405
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406 for (i = 1; i < argc; i++) {
407 const char *arg = argv[i];
408 cmd_len += strlen(arg);
409
410 if (arg[0] != '-')
411 break;
412 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
413 append = 1;
414 continue;
415 }
416 if (!prefixcmp(arg, "--upload-pack=")) {
417 upload_pack = arg + 14;
418 continue;
419 }
420 if (!strcmp(arg, "--upload-pack")) {
421 i++;
422 if (i == argc)
423 usage(fetch_usage);
424 upload_pack = argv[i];
425 continue;
426 }
427 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
428 force = 1;
429 continue;
430 }
431 if (!strcmp(arg, "--no-tags")) {
432 no_tags = 1;
433 continue;
434 }
435 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
436 tags = 1;
437 continue;
438 }
439 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
440 keep = 1;
441 continue;
442 }
443 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
444 update_head_ok = 1;
445 continue;
446 }
447 if (!prefixcmp(arg, "--depth=")) {
448 depth = arg + 8;
449 continue;
450 }
451 if (!strcmp(arg, "--depth")) {
452 i++;
453 if (i == argc)
454 usage(fetch_usage);
455 depth = argv[i];
456 continue;
457 }
458 if (!strcmp(arg, "--quiet")) {
459 quiet = 1;
460 continue;
461 }
462 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
463 verbose++;
464 continue;
465 }
466 usage(fetch_usage);
467 }
468
469 for (j = i; j < argc; j++)
470 cmd_len += strlen(argv[j]);
471
472 default_rla = xmalloc(cmd_len + 5 + argc + 1);
473 sprintf(default_rla, "fetch");
474 rla_offset = strlen(default_rla);
475 for (j = 1; j < argc; j++) {
476 sprintf(default_rla + rla_offset, " %s", argv[j]);
4ad1eada 477 rla_offset += strlen(argv[j]) + 1;
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478 }
479
480 if (i == argc)
481 remote = remote_get(NULL);
482 else
483 remote = remote_get(argv[i++]);
484
485 transport = transport_get(remote, remote->uri[0], 1);
486 if (verbose >= 2)
487 transport->verbose = 1;
488 if (quiet)
489 transport->verbose = 0;
490 if (upload_pack)
491 transport_set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
492 if (keep)
493 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
494 transport_set_option(transport, TRANS_OPT_DEPTH, depth);
495
496 if (!transport->url)
497 die("Where do you want to fetch from today?");
498
499 if (i < argc) {
500 int j = 0;
501 refs = xcalloc(argc - i + 1, sizeof(const char *));
502 while (i < argc) {
503 if (!strcmp(argv[i], "tag")) {
504 char *ref;
505 i++;
506 ref = xmalloc(strlen(argv[i]) * 2 + 22);
507 strcpy(ref, "refs/tags/");
508 strcat(ref, argv[i]);
509 strcat(ref, ":refs/tags/");
510 strcat(ref, argv[i]);
511 refs[j++] = ref;
512 } else
513 refs[j++] = argv[i];
514 i++;
515 }
516 refs[j] = NULL;
517 ref_nr = j;
518 for (j = 0; refs[j]; j++)
519 printf("ref: %s\n", refs[j]);
520 }
521
522 return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
523}