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Commit | Line | Data |
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def88e9a | 1 | #include "cache.h" |
fb9040cc | 2 | #include "refs.h" |
def88e9a | 3 | #include "pkt-line.h" |
49bb805e JH |
4 | #include "commit.h" |
5 | #include "tag.h" | |
def88e9a | 6 | |
ad897215 | 7 | static int keep_pack; |
8b3d9dc0 | 8 | static int quiet; |
33b83034 | 9 | static int verbose; |
dfeff66e | 10 | static int fetch_all; |
33b83034 | 11 | static const char fetch_pack_usage[] = |
dfeff66e | 12 | "git-fetch-pack [--all] [-q] [-v] [-k] [--thin] [--exec=upload-pack] [host:]directory <refs>..."; |
def88e9a LT |
13 | static const char *exec = "git-upload-pack"; |
14 | ||
0a8944dd | 15 | #define COMPLETE (1U << 0) |
23d61f83 JS |
16 | #define COMMON (1U << 1) |
17 | #define COMMON_REF (1U << 2) | |
18 | #define SEEN (1U << 3) | |
19 | #define POPPED (1U << 4) | |
20 | ||
f061e5fd JH |
21 | /* |
22 | * After sending this many "have"s if we do not get any new ACK , we | |
23 | * give up traversing our history. | |
24 | */ | |
25 | #define MAX_IN_VAIN 256 | |
26 | ||
96f1e58f DR |
27 | static struct commit_list *rev_list; |
28 | static int non_common_revs, multi_ack, use_thin_pack, use_sideband; | |
23d61f83 JS |
29 | |
30 | static void rev_list_push(struct commit *commit, int mark) | |
31 | { | |
32 | if (!(commit->object.flags & mark)) { | |
33 | commit->object.flags |= mark; | |
34 | ||
35 | if (!(commit->object.parsed)) | |
36 | parse_commit(commit); | |
37 | ||
38 | insert_by_date(commit, &rev_list); | |
39 | ||
40 | if (!(commit->object.flags & COMMON)) | |
41 | non_common_revs++; | |
42 | } | |
43 | } | |
44 | ||
45 | static int rev_list_insert_ref(const char *path, const unsigned char *sha1) | |
46 | { | |
9534f40b | 47 | struct object *o = deref_tag(parse_object(sha1), path, 0); |
23d61f83 | 48 | |
1974632c | 49 | if (o && o->type == OBJ_COMMIT) |
23d61f83 JS |
50 | rev_list_push((struct commit *)o, SEEN); |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | /* | |
56 | This function marks a rev and its ancestors as common. | |
57 | In some cases, it is desirable to mark only the ancestors (for example | |
58 | when only the server does not yet know that they are common). | |
59 | */ | |
60 | ||
61 | static void mark_common(struct commit *commit, | |
62 | int ancestors_only, int dont_parse) | |
63 | { | |
64 | if (commit != NULL && !(commit->object.flags & COMMON)) { | |
65 | struct object *o = (struct object *)commit; | |
66 | ||
67 | if (!ancestors_only) | |
68 | o->flags |= COMMON; | |
69 | ||
70 | if (!(o->flags & SEEN)) | |
71 | rev_list_push(commit, SEEN); | |
72 | else { | |
73 | struct commit_list *parents; | |
74 | ||
75 | if (!ancestors_only && !(o->flags & POPPED)) | |
76 | non_common_revs--; | |
77 | if (!o->parsed && !dont_parse) | |
78 | parse_commit(commit); | |
79 | ||
80 | for (parents = commit->parents; | |
81 | parents; | |
82 | parents = parents->next) | |
83 | mark_common(parents->item, 0, dont_parse); | |
84 | } | |
85 | } | |
86 | } | |
87 | ||
88 | /* | |
89 | Get the next rev to send, ignoring the common. | |
90 | */ | |
91 | ||
962554c6 | 92 | static const unsigned char* get_rev(void) |
23d61f83 JS |
93 | { |
94 | struct commit *commit = NULL; | |
95 | ||
96 | while (commit == NULL) { | |
97 | unsigned int mark; | |
98 | struct commit_list* parents; | |
99 | ||
100 | if (rev_list == NULL || non_common_revs == 0) | |
101 | return NULL; | |
102 | ||
103 | commit = rev_list->item; | |
104 | if (!(commit->object.parsed)) | |
105 | parse_commit(commit); | |
106 | commit->object.flags |= POPPED; | |
107 | if (!(commit->object.flags & COMMON)) | |
108 | non_common_revs--; | |
109 | ||
110 | parents = commit->parents; | |
111 | ||
112 | if (commit->object.flags & COMMON) { | |
113 | /* do not send "have", and ignore ancestors */ | |
114 | commit = NULL; | |
115 | mark = COMMON | SEEN; | |
116 | } else if (commit->object.flags & COMMON_REF) | |
117 | /* send "have", and ignore ancestors */ | |
118 | mark = COMMON | SEEN; | |
119 | else | |
120 | /* send "have", also for its ancestors */ | |
121 | mark = SEEN; | |
122 | ||
123 | while (parents) { | |
124 | if (!(parents->item->object.flags & SEEN)) | |
125 | rev_list_push(parents->item, mark); | |
126 | if (mark & COMMON) | |
127 | mark_common(parents->item, 1, 0); | |
128 | parents = parents->next; | |
129 | } | |
130 | ||
131 | rev_list = rev_list->next; | |
132 | } | |
133 | ||
134 | return commit->object.sha1; | |
135 | } | |
0a8944dd | 136 | |
33b83034 JH |
137 | static int find_common(int fd[2], unsigned char *result_sha1, |
138 | struct ref *refs) | |
def88e9a | 139 | { |
2759cbc7 | 140 | int fetching; |
23d61f83 JS |
141 | int count = 0, flushes = 0, retval; |
142 | const unsigned char *sha1; | |
f061e5fd JH |
143 | unsigned in_vain = 0; |
144 | int got_continue = 0; | |
23d61f83 JS |
145 | |
146 | for_each_ref(rev_list_insert_ref); | |
def88e9a | 147 | |
2759cbc7 LT |
148 | fetching = 0; |
149 | for ( ; refs ; refs = refs->next) { | |
33b83034 | 150 | unsigned char *remote = refs->old_sha1; |
4dab94d5 | 151 | struct object *o; |
2759cbc7 | 152 | |
0a8944dd | 153 | /* |
4dab94d5 JH |
154 | * If that object is complete (i.e. it is an ancestor of a |
155 | * local ref), we tell them we have it but do not have to | |
156 | * tell them about its ancestors, which they already know | |
157 | * about. | |
f1f0a2be JH |
158 | * |
159 | * We use lookup_object here because we are only | |
160 | * interested in the case we *know* the object is | |
161 | * reachable and we have already scanned it. | |
4dab94d5 | 162 | */ |
f1f0a2be | 163 | if (((o = lookup_object(remote)) != NULL) && |
1baaae5e | 164 | (o->flags & COMPLETE)) { |
2759cbc7 | 165 | continue; |
0a8944dd | 166 | } |
23d61f83 | 167 | |
583b7ea3 | 168 | if (!fetching) |
d47f3db7 | 169 | packet_write(fd[1], "want %s%s%s%s%s\n", |
583b7ea3 JH |
170 | sha1_to_hex(remote), |
171 | (multi_ack ? " multi_ack" : ""), | |
d47f3db7 JH |
172 | (use_sideband == 2 ? " side-band-64k" : ""), |
173 | (use_sideband == 1 ? " side-band" : ""), | |
583b7ea3 JH |
174 | (use_thin_pack ? " thin-pack" : "")); |
175 | else | |
176 | packet_write(fd[1], "want %s\n", sha1_to_hex(remote)); | |
2759cbc7 | 177 | fetching++; |
33b83034 | 178 | } |
fb9040cc | 179 | packet_flush(fd[1]); |
2759cbc7 LT |
180 | if (!fetching) |
181 | return 1; | |
0a8944dd | 182 | |
23d61f83 | 183 | flushes = 0; |
75bfc6c2 | 184 | retval = -1; |
23d61f83 | 185 | while ((sha1 = get_rev())) { |
def88e9a | 186 | packet_write(fd[1], "have %s\n", sha1_to_hex(sha1)); |
33b83034 JH |
187 | if (verbose) |
188 | fprintf(stderr, "have %s\n", sha1_to_hex(sha1)); | |
f061e5fd | 189 | in_vain++; |
def88e9a | 190 | if (!(31 & ++count)) { |
c4c86f07 JS |
191 | int ack; |
192 | ||
def88e9a LT |
193 | packet_flush(fd[1]); |
194 | flushes++; | |
195 | ||
196 | /* | |
197 | * We keep one window "ahead" of the other side, and | |
198 | * will wait for an ACK only on the next one | |
199 | */ | |
200 | if (count == 32) | |
201 | continue; | |
c4c86f07 JS |
202 | |
203 | do { | |
204 | ack = get_ack(fd[0], result_sha1); | |
205 | if (verbose && ack) | |
206 | fprintf(stderr, "got ack %d %s\n", ack, | |
207 | sha1_to_hex(result_sha1)); | |
208 | if (ack == 1) { | |
209 | flushes = 0; | |
210 | multi_ack = 0; | |
211 | retval = 0; | |
212 | goto done; | |
213 | } else if (ack == 2) { | |
214 | struct commit *commit = | |
215 | lookup_commit(result_sha1); | |
216 | mark_common(commit, 0, 1); | |
217 | retval = 0; | |
f061e5fd JH |
218 | in_vain = 0; |
219 | got_continue = 1; | |
c4c86f07 JS |
220 | } |
221 | } while (ack); | |
def88e9a | 222 | flushes--; |
f061e5fd JH |
223 | if (got_continue && MAX_IN_VAIN < in_vain) { |
224 | if (verbose) | |
225 | fprintf(stderr, "giving up\n"); | |
226 | break; /* give up */ | |
227 | } | |
def88e9a LT |
228 | } |
229 | } | |
c4c86f07 | 230 | done: |
75bfc6c2 | 231 | packet_write(fd[1], "done\n"); |
33b83034 JH |
232 | if (verbose) |
233 | fprintf(stderr, "done\n"); | |
c4c86f07 JS |
234 | if (retval != 0) { |
235 | multi_ack = 0; | |
23d61f83 | 236 | flushes++; |
c4c86f07 JS |
237 | } |
238 | while (flushes || multi_ack) { | |
239 | int ack = get_ack(fd[0], result_sha1); | |
240 | if (ack) { | |
33b83034 | 241 | if (verbose) |
c4c86f07 JS |
242 | fprintf(stderr, "got ack (%d) %s\n", ack, |
243 | sha1_to_hex(result_sha1)); | |
244 | if (ack == 1) | |
245 | return 0; | |
246 | multi_ack = 1; | |
247 | continue; | |
33b83034 | 248 | } |
c4c86f07 | 249 | flushes--; |
def88e9a | 250 | } |
75bfc6c2 | 251 | return retval; |
def88e9a LT |
252 | } |
253 | ||
96f1e58f | 254 | static struct commit_list *complete; |
49bb805e JH |
255 | |
256 | static int mark_complete(const char *path, const unsigned char *sha1) | |
257 | { | |
258 | struct object *o = parse_object(sha1); | |
259 | ||
1974632c | 260 | while (o && o->type == OBJ_TAG) { |
f1f0a2be JH |
261 | struct tag *t = (struct tag *) o; |
262 | if (!t->tagged) | |
263 | break; /* broken repository */ | |
49bb805e | 264 | o->flags |= COMPLETE; |
f1f0a2be | 265 | o = parse_object(t->tagged->sha1); |
49bb805e | 266 | } |
1974632c | 267 | if (o && o->type == OBJ_COMMIT) { |
49bb805e JH |
268 | struct commit *commit = (struct commit *)o; |
269 | commit->object.flags |= COMPLETE; | |
270 | insert_by_date(commit, &complete); | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static void mark_recent_complete_commits(unsigned long cutoff) | |
276 | { | |
277 | while (complete && cutoff <= complete->item->date) { | |
278 | if (verbose) | |
279 | fprintf(stderr, "Marking %s as complete\n", | |
280 | sha1_to_hex(complete->item->object.sha1)); | |
281 | pop_most_recent_commit(&complete, COMPLETE); | |
282 | } | |
283 | } | |
284 | ||
1baaae5e JS |
285 | static void filter_refs(struct ref **refs, int nr_match, char **match) |
286 | { | |
9546010b JH |
287 | struct ref **return_refs; |
288 | struct ref *newlist = NULL; | |
289 | struct ref **newtail = &newlist; | |
290 | struct ref *ref, *next; | |
291 | struct ref *fastarray[32]; | |
292 | ||
293 | if (nr_match && !fetch_all) { | |
294 | if (ARRAY_SIZE(fastarray) < nr_match) | |
295 | return_refs = xcalloc(nr_match, sizeof(struct ref *)); | |
296 | else { | |
297 | return_refs = fastarray; | |
298 | memset(return_refs, 0, sizeof(struct ref *) * nr_match); | |
299 | } | |
300 | } | |
301 | else | |
302 | return_refs = NULL; | |
303 | ||
304 | for (ref = *refs; ref; ref = next) { | |
305 | next = ref->next; | |
306 | if (!memcmp(ref->name, "refs/", 5) && | |
307 | check_ref_format(ref->name + 5)) | |
308 | ; /* trash */ | |
309 | else if (fetch_all) { | |
310 | *newtail = ref; | |
311 | ref->next = NULL; | |
312 | newtail = &ref->next; | |
313 | continue; | |
314 | } | |
315 | else { | |
316 | int order = path_match(ref->name, nr_match, match); | |
317 | if (order) { | |
318 | return_refs[order-1] = ref; | |
319 | continue; /* we will link it later */ | |
320 | } | |
321 | } | |
322 | free(ref); | |
323 | } | |
324 | ||
325 | if (!fetch_all) { | |
326 | int i; | |
327 | for (i = 0; i < nr_match; i++) { | |
328 | ref = return_refs[i]; | |
329 | if (ref) { | |
330 | *newtail = ref; | |
331 | ref->next = NULL; | |
332 | newtail = &ref->next; | |
333 | } | |
334 | } | |
335 | if (return_refs != fastarray) | |
336 | free(return_refs); | |
1baaae5e | 337 | } |
9546010b | 338 | *refs = newlist; |
1baaae5e JS |
339 | } |
340 | ||
341 | static int everything_local(struct ref **refs, int nr_match, char **match) | |
2759cbc7 | 342 | { |
49bb805e | 343 | struct ref *ref; |
2759cbc7 | 344 | int retval; |
49bb805e JH |
345 | unsigned long cutoff = 0; |
346 | ||
347 | track_object_refs = 0; | |
348 | save_commit_buffer = 0; | |
349 | ||
1baaae5e | 350 | for (ref = *refs; ref; ref = ref->next) { |
49bb805e JH |
351 | struct object *o; |
352 | ||
353 | o = parse_object(ref->old_sha1); | |
354 | if (!o) | |
355 | continue; | |
356 | ||
357 | /* We already have it -- which may mean that we were | |
358 | * in sync with the other side at some time after | |
359 | * that (it is OK if we guess wrong here). | |
360 | */ | |
1974632c | 361 | if (o->type == OBJ_COMMIT) { |
49bb805e JH |
362 | struct commit *commit = (struct commit *)o; |
363 | if (!cutoff || cutoff < commit->date) | |
364 | cutoff = commit->date; | |
365 | } | |
366 | } | |
367 | ||
368 | for_each_ref(mark_complete); | |
369 | if (cutoff) | |
370 | mark_recent_complete_commits(cutoff); | |
2759cbc7 | 371 | |
1baaae5e JS |
372 | /* |
373 | * Mark all complete remote refs as common refs. | |
374 | * Don't mark them common yet; the server has to be told so first. | |
375 | */ | |
376 | for (ref = *refs; ref; ref = ref->next) { | |
9534f40b JH |
377 | struct object *o = deref_tag(lookup_object(ref->old_sha1), |
378 | NULL, 0); | |
1baaae5e | 379 | |
1974632c | 380 | if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE)) |
1baaae5e JS |
381 | continue; |
382 | ||
383 | if (!(o->flags & SEEN)) { | |
384 | rev_list_push((struct commit *)o, COMMON_REF | SEEN); | |
385 | ||
386 | mark_common((struct commit *)o, 1, 1); | |
387 | } | |
388 | } | |
389 | ||
390 | filter_refs(refs, nr_match, match); | |
391 | ||
392 | for (retval = 1, ref = *refs; ref ; ref = ref->next) { | |
393 | const unsigned char *remote = ref->old_sha1; | |
2759cbc7 | 394 | unsigned char local[20]; |
49bb805e | 395 | struct object *o; |
2759cbc7 | 396 | |
1baaae5e | 397 | o = lookup_object(remote); |
49bb805e | 398 | if (!o || !(o->flags & COMPLETE)) { |
2759cbc7 LT |
399 | retval = 0; |
400 | if (!verbose) | |
401 | continue; | |
402 | fprintf(stderr, | |
403 | "want %s (%s)\n", sha1_to_hex(remote), | |
1baaae5e | 404 | ref->name); |
2759cbc7 LT |
405 | continue; |
406 | } | |
407 | ||
e702496e | 408 | hashcpy(ref->new_sha1, local); |
2759cbc7 LT |
409 | if (!verbose) |
410 | continue; | |
411 | fprintf(stderr, | |
412 | "already have %s (%s)\n", sha1_to_hex(remote), | |
1baaae5e | 413 | ref->name); |
2759cbc7 LT |
414 | } |
415 | return retval; | |
416 | } | |
417 | ||
def88e9a LT |
418 | static int fetch_pack(int fd[2], int nr_match, char **match) |
419 | { | |
d1c133f5 LT |
420 | struct ref *ref; |
421 | unsigned char sha1[20]; | |
422 | int status; | |
def88e9a | 423 | |
1baaae5e | 424 | get_remote_heads(fd[0], &ref, 0, NULL, 0); |
c4c86f07 JS |
425 | if (server_supports("multi_ack")) { |
426 | if (verbose) | |
427 | fprintf(stderr, "Server supports multi_ack\n"); | |
428 | multi_ack = 1; | |
429 | } | |
d47f3db7 JH |
430 | if (server_supports("side-band-64k")) { |
431 | if (verbose) | |
432 | fprintf(stderr, "Server supports side-band-64k\n"); | |
433 | use_sideband = 2; | |
434 | } | |
435 | else if (server_supports("side-band")) { | |
583b7ea3 JH |
436 | if (verbose) |
437 | fprintf(stderr, "Server supports side-band\n"); | |
438 | use_sideband = 1; | |
439 | } | |
d1c133f5 LT |
440 | if (!ref) { |
441 | packet_flush(fd[1]); | |
442 | die("no matching remote head"); | |
443 | } | |
1baaae5e | 444 | if (everything_local(&ref, nr_match, match)) { |
2759cbc7 LT |
445 | packet_flush(fd[1]); |
446 | goto all_done; | |
447 | } | |
33b83034 | 448 | if (find_common(fd, sha1, ref) < 0) |
dfeff66e JH |
449 | if (!keep_pack) |
450 | /* When cloning, it is not unusual to have | |
451 | * no common commit. | |
452 | */ | |
453 | fprintf(stderr, "warning: no common commits\n"); | |
ad897215 JH |
454 | |
455 | if (keep_pack) | |
583b7ea3 | 456 | status = receive_keep_pack(fd, "git-fetch-pack", quiet, use_sideband); |
ad897215 | 457 | else |
583b7ea3 | 458 | status = receive_unpack_pack(fd, "git-fetch-pack", quiet, use_sideband); |
ad897215 JH |
459 | |
460 | if (status) | |
461 | die("git-fetch-pack: fetch failed."); | |
462 | ||
463 | all_done: | |
464 | while (ref) { | |
465 | printf("%s %s\n", | |
466 | sha1_to_hex(ref->old_sha1), ref->name); | |
467 | ref = ref->next; | |
75bfc6c2 | 468 | } |
ad897215 | 469 | return 0; |
def88e9a LT |
470 | } |
471 | ||
472 | int main(int argc, char **argv) | |
473 | { | |
474 | int i, ret, nr_heads; | |
475 | char *dest = NULL, **heads; | |
476 | int fd[2]; | |
477 | pid_t pid; | |
478 | ||
5a327713 JH |
479 | setup_git_directory(); |
480 | ||
def88e9a LT |
481 | nr_heads = 0; |
482 | heads = NULL; | |
483 | for (i = 1; i < argc; i++) { | |
484 | char *arg = argv[i]; | |
485 | ||
486 | if (*arg == '-') { | |
8b3d9dc0 JH |
487 | if (!strncmp("--exec=", arg, 7)) { |
488 | exec = arg + 7; | |
489 | continue; | |
490 | } | |
2247efb4 | 491 | if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) { |
33b83034 JH |
492 | quiet = 1; |
493 | continue; | |
494 | } | |
2247efb4 | 495 | if (!strcmp("--keep", arg) || !strcmp("-k", arg)) { |
ad897215 JH |
496 | keep_pack = 1; |
497 | continue; | |
498 | } | |
b19696c2 JH |
499 | if (!strcmp("--thin", arg)) { |
500 | use_thin_pack = 1; | |
501 | continue; | |
502 | } | |
dfeff66e JH |
503 | if (!strcmp("--all", arg)) { |
504 | fetch_all = 1; | |
505 | continue; | |
506 | } | |
33b83034 JH |
507 | if (!strcmp("-v", arg)) { |
508 | verbose = 1; | |
509 | continue; | |
510 | } | |
def88e9a LT |
511 | usage(fetch_pack_usage); |
512 | } | |
513 | dest = arg; | |
514 | heads = argv + i + 1; | |
515 | nr_heads = argc - i - 1; | |
516 | break; | |
517 | } | |
518 | if (!dest) | |
519 | usage(fetch_pack_usage); | |
b19696c2 JH |
520 | if (keep_pack) |
521 | use_thin_pack = 0; | |
def88e9a LT |
522 | pid = git_connect(fd, dest, exec); |
523 | if (pid < 0) | |
524 | return 1; | |
525 | ret = fetch_pack(fd, nr_heads, heads); | |
526 | close(fd[0]); | |
527 | close(fd[1]); | |
8a5dbef8 | 528 | ret |= finish_connect(pid); |
9e5d2b40 JH |
529 | |
530 | if (!ret && nr_heads) { | |
531 | /* If the heads to pull were given, we should have | |
532 | * consumed all of them by matching the remote. | |
533 | * Otherwise, 'git-fetch remote no-such-ref' would | |
534 | * silently succeed without issuing an error. | |
535 | */ | |
536 | for (i = 0; i < nr_heads; i++) | |
537 | if (heads[i] && heads[i][0]) { | |
538 | error("no such remote ref %s", heads[i]); | |
539 | ret = 1; | |
540 | } | |
541 | } | |
542 | ||
8a5dbef8 | 543 | return !!ret; |
def88e9a | 544 | } |