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745f7a8c NTND |
1 | #include "cache.h" |
2 | #include "refs.h" | |
3 | #include "pkt-line.h" | |
4 | #include "commit.h" | |
5 | #include "tag.h" | |
6 | #include "exec_cmd.h" | |
7 | #include "pack.h" | |
8 | #include "sideband.h" | |
9 | #include "fetch-pack.h" | |
10 | #include "remote.h" | |
11 | #include "run-command.h" | |
12 | #include "transport.h" | |
13 | #include "version.h" | |
14 | ||
15 | static int transfer_unpack_limit = -1; | |
16 | static int fetch_unpack_limit = -1; | |
17 | static int unpack_limit = 100; | |
18 | static int prefer_ofs_delta = 1; | |
19 | static int no_done; | |
20 | static int fetch_fsck_objects = -1; | |
21 | static int transfer_fsck_objects = -1; | |
22 | static int agent_supported; | |
23 | ||
24 | #define COMPLETE (1U << 0) | |
25 | #define COMMON (1U << 1) | |
26 | #define COMMON_REF (1U << 2) | |
27 | #define SEEN (1U << 3) | |
28 | #define POPPED (1U << 4) | |
29 | ||
30 | static int marked; | |
31 | ||
32 | /* | |
33 | * After sending this many "have"s if we do not get any new ACK , we | |
34 | * give up traversing our history. | |
35 | */ | |
36 | #define MAX_IN_VAIN 256 | |
37 | ||
38 | static struct commit_list *rev_list; | |
39 | static int non_common_revs, multi_ack, use_sideband; | |
40 | ||
41 | static void rev_list_push(struct commit *commit, int mark) | |
42 | { | |
43 | if (!(commit->object.flags & mark)) { | |
44 | commit->object.flags |= mark; | |
45 | ||
46 | if (!(commit->object.parsed)) | |
47 | if (parse_commit(commit)) | |
48 | return; | |
49 | ||
50 | commit_list_insert_by_date(commit, &rev_list); | |
51 | ||
52 | if (!(commit->object.flags & COMMON)) | |
53 | non_common_revs++; | |
54 | } | |
55 | } | |
56 | ||
57 | static int rev_list_insert_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) | |
58 | { | |
59 | struct object *o = deref_tag(parse_object(sha1), refname, 0); | |
60 | ||
61 | if (o && o->type == OBJ_COMMIT) | |
62 | rev_list_push((struct commit *)o, SEEN); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static int clear_marks(const char *refname, const unsigned char *sha1, int flag, void *cb_data) | |
68 | { | |
69 | struct object *o = deref_tag(parse_object(sha1), refname, 0); | |
70 | ||
71 | if (o && o->type == OBJ_COMMIT) | |
72 | clear_commit_marks((struct commit *)o, | |
73 | COMMON | COMMON_REF | SEEN | POPPED); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* | |
78 | This function marks a rev and its ancestors as common. | |
79 | In some cases, it is desirable to mark only the ancestors (for example | |
80 | when only the server does not yet know that they are common). | |
81 | */ | |
82 | ||
83 | static void mark_common(struct commit *commit, | |
84 | int ancestors_only, int dont_parse) | |
85 | { | |
86 | if (commit != NULL && !(commit->object.flags & COMMON)) { | |
87 | struct object *o = (struct object *)commit; | |
88 | ||
89 | if (!ancestors_only) | |
90 | o->flags |= COMMON; | |
91 | ||
92 | if (!(o->flags & SEEN)) | |
93 | rev_list_push(commit, SEEN); | |
94 | else { | |
95 | struct commit_list *parents; | |
96 | ||
97 | if (!ancestors_only && !(o->flags & POPPED)) | |
98 | non_common_revs--; | |
99 | if (!o->parsed && !dont_parse) | |
100 | if (parse_commit(commit)) | |
101 | return; | |
102 | ||
103 | for (parents = commit->parents; | |
104 | parents; | |
105 | parents = parents->next) | |
106 | mark_common(parents->item, 0, dont_parse); | |
107 | } | |
108 | } | |
109 | } | |
110 | ||
111 | /* | |
112 | Get the next rev to send, ignoring the common. | |
113 | */ | |
114 | ||
115 | static const unsigned char *get_rev(void) | |
116 | { | |
117 | struct commit *commit = NULL; | |
118 | ||
119 | while (commit == NULL) { | |
120 | unsigned int mark; | |
121 | struct commit_list *parents; | |
122 | ||
123 | if (rev_list == NULL || non_common_revs == 0) | |
124 | return NULL; | |
125 | ||
126 | commit = rev_list->item; | |
127 | if (!commit->object.parsed) | |
128 | parse_commit(commit); | |
129 | parents = commit->parents; | |
130 | ||
131 | commit->object.flags |= POPPED; | |
132 | if (!(commit->object.flags & COMMON)) | |
133 | non_common_revs--; | |
134 | ||
135 | if (commit->object.flags & COMMON) { | |
136 | /* do not send "have", and ignore ancestors */ | |
137 | commit = NULL; | |
138 | mark = COMMON | SEEN; | |
139 | } else if (commit->object.flags & COMMON_REF) | |
140 | /* send "have", and ignore ancestors */ | |
141 | mark = COMMON | SEEN; | |
142 | else | |
143 | /* send "have", also for its ancestors */ | |
144 | mark = SEEN; | |
145 | ||
146 | while (parents) { | |
147 | if (!(parents->item->object.flags & SEEN)) | |
148 | rev_list_push(parents->item, mark); | |
149 | if (mark & COMMON) | |
150 | mark_common(parents->item, 1, 0); | |
151 | parents = parents->next; | |
152 | } | |
153 | ||
154 | rev_list = rev_list->next; | |
155 | } | |
156 | ||
157 | return commit->object.sha1; | |
158 | } | |
159 | ||
160 | enum ack_type { | |
161 | NAK = 0, | |
162 | ACK, | |
163 | ACK_continue, | |
164 | ACK_common, | |
165 | ACK_ready | |
166 | }; | |
167 | ||
168 | static void consume_shallow_list(struct fetch_pack_args *args, int fd) | |
169 | { | |
170 | if (args->stateless_rpc && args->depth > 0) { | |
171 | /* If we sent a depth we will get back "duplicate" | |
172 | * shallow and unshallow commands every time there | |
173 | * is a block of have lines exchanged. | |
174 | */ | |
175 | char line[1000]; | |
176 | while (packet_read_line(fd, line, sizeof(line))) { | |
177 | if (!prefixcmp(line, "shallow ")) | |
178 | continue; | |
179 | if (!prefixcmp(line, "unshallow ")) | |
180 | continue; | |
181 | die("git fetch-pack: expected shallow list"); | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | struct write_shallow_data { | |
187 | struct strbuf *out; | |
188 | int use_pack_protocol; | |
189 | int count; | |
190 | }; | |
191 | ||
192 | static int write_one_shallow(const struct commit_graft *graft, void *cb_data) | |
193 | { | |
194 | struct write_shallow_data *data = cb_data; | |
195 | const char *hex = sha1_to_hex(graft->sha1); | |
196 | data->count++; | |
197 | if (data->use_pack_protocol) | |
198 | packet_buf_write(data->out, "shallow %s", hex); | |
199 | else { | |
200 | strbuf_addstr(data->out, hex); | |
201 | strbuf_addch(data->out, '\n'); | |
202 | } | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int write_shallow_commits(struct strbuf *out, int use_pack_protocol) | |
207 | { | |
208 | struct write_shallow_data data; | |
209 | data.out = out; | |
210 | data.use_pack_protocol = use_pack_protocol; | |
211 | data.count = 0; | |
212 | for_each_commit_graft(write_one_shallow, &data); | |
213 | return data.count; | |
214 | } | |
215 | ||
216 | static enum ack_type get_ack(int fd, unsigned char *result_sha1) | |
217 | { | |
218 | static char line[1000]; | |
219 | int len = packet_read_line(fd, line, sizeof(line)); | |
220 | ||
221 | if (!len) | |
222 | die("git fetch-pack: expected ACK/NAK, got EOF"); | |
223 | if (line[len-1] == '\n') | |
224 | line[--len] = 0; | |
225 | if (!strcmp(line, "NAK")) | |
226 | return NAK; | |
227 | if (!prefixcmp(line, "ACK ")) { | |
228 | if (!get_sha1_hex(line+4, result_sha1)) { | |
229 | if (strstr(line+45, "continue")) | |
230 | return ACK_continue; | |
231 | if (strstr(line+45, "common")) | |
232 | return ACK_common; | |
233 | if (strstr(line+45, "ready")) | |
234 | return ACK_ready; | |
235 | return ACK; | |
236 | } | |
237 | } | |
238 | die("git fetch_pack: expected ACK/NAK, got '%s'", line); | |
239 | } | |
240 | ||
241 | static void send_request(struct fetch_pack_args *args, | |
242 | int fd, struct strbuf *buf) | |
243 | { | |
244 | if (args->stateless_rpc) { | |
245 | send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX); | |
246 | packet_flush(fd); | |
247 | } else | |
248 | safe_write(fd, buf->buf, buf->len); | |
249 | } | |
250 | ||
251 | static void insert_one_alternate_ref(const struct ref *ref, void *unused) | |
252 | { | |
253 | rev_list_insert_ref(NULL, ref->old_sha1, 0, NULL); | |
254 | } | |
255 | ||
256 | #define INITIAL_FLUSH 16 | |
257 | #define PIPESAFE_FLUSH 32 | |
258 | #define LARGE_FLUSH 1024 | |
259 | ||
260 | static int next_flush(struct fetch_pack_args *args, int count) | |
261 | { | |
262 | int flush_limit = args->stateless_rpc ? LARGE_FLUSH : PIPESAFE_FLUSH; | |
263 | ||
264 | if (count < flush_limit) | |
265 | count <<= 1; | |
266 | else | |
267 | count += flush_limit; | |
268 | return count; | |
269 | } | |
270 | ||
271 | static int find_common(struct fetch_pack_args *args, | |
272 | int fd[2], unsigned char *result_sha1, | |
273 | struct ref *refs) | |
274 | { | |
275 | int fetching; | |
276 | int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval; | |
277 | const unsigned char *sha1; | |
278 | unsigned in_vain = 0; | |
279 | int got_continue = 0; | |
280 | int got_ready = 0; | |
281 | struct strbuf req_buf = STRBUF_INIT; | |
282 | size_t state_len = 0; | |
283 | ||
284 | if (args->stateless_rpc && multi_ack == 1) | |
285 | die("--stateless-rpc requires multi_ack_detailed"); | |
286 | if (marked) | |
287 | for_each_ref(clear_marks, NULL); | |
288 | marked = 1; | |
289 | ||
290 | for_each_ref(rev_list_insert_ref, NULL); | |
291 | for_each_alternate_ref(insert_one_alternate_ref, NULL); | |
292 | ||
293 | fetching = 0; | |
294 | for ( ; refs ; refs = refs->next) { | |
295 | unsigned char *remote = refs->old_sha1; | |
296 | const char *remote_hex; | |
297 | struct object *o; | |
298 | ||
299 | /* | |
300 | * If that object is complete (i.e. it is an ancestor of a | |
301 | * local ref), we tell them we have it but do not have to | |
302 | * tell them about its ancestors, which they already know | |
303 | * about. | |
304 | * | |
305 | * We use lookup_object here because we are only | |
306 | * interested in the case we *know* the object is | |
307 | * reachable and we have already scanned it. | |
308 | */ | |
309 | if (((o = lookup_object(remote)) != NULL) && | |
310 | (o->flags & COMPLETE)) { | |
311 | continue; | |
312 | } | |
313 | ||
314 | remote_hex = sha1_to_hex(remote); | |
315 | if (!fetching) { | |
316 | struct strbuf c = STRBUF_INIT; | |
317 | if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed"); | |
318 | if (multi_ack == 1) strbuf_addstr(&c, " multi_ack"); | |
319 | if (no_done) strbuf_addstr(&c, " no-done"); | |
320 | if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k"); | |
321 | if (use_sideband == 1) strbuf_addstr(&c, " side-band"); | |
322 | if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack"); | |
323 | if (args->no_progress) strbuf_addstr(&c, " no-progress"); | |
324 | if (args->include_tag) strbuf_addstr(&c, " include-tag"); | |
325 | if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta"); | |
326 | if (agent_supported) strbuf_addf(&c, " agent=%s", | |
327 | git_user_agent_sanitized()); | |
328 | packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf); | |
329 | strbuf_release(&c); | |
330 | } else | |
331 | packet_buf_write(&req_buf, "want %s\n", remote_hex); | |
332 | fetching++; | |
333 | } | |
334 | ||
335 | if (!fetching) { | |
336 | strbuf_release(&req_buf); | |
337 | packet_flush(fd[1]); | |
338 | return 1; | |
339 | } | |
340 | ||
341 | if (is_repository_shallow()) | |
342 | write_shallow_commits(&req_buf, 1); | |
343 | if (args->depth > 0) | |
344 | packet_buf_write(&req_buf, "deepen %d", args->depth); | |
345 | packet_buf_flush(&req_buf); | |
346 | state_len = req_buf.len; | |
347 | ||
348 | if (args->depth > 0) { | |
349 | char line[1024]; | |
350 | unsigned char sha1[20]; | |
351 | ||
352 | send_request(args, fd[1], &req_buf); | |
353 | while (packet_read_line(fd[0], line, sizeof(line))) { | |
354 | if (!prefixcmp(line, "shallow ")) { | |
355 | if (get_sha1_hex(line + 8, sha1)) | |
356 | die("invalid shallow line: %s", line); | |
357 | register_shallow(sha1); | |
358 | continue; | |
359 | } | |
360 | if (!prefixcmp(line, "unshallow ")) { | |
361 | if (get_sha1_hex(line + 10, sha1)) | |
362 | die("invalid unshallow line: %s", line); | |
363 | if (!lookup_object(sha1)) | |
364 | die("object not found: %s", line); | |
365 | /* make sure that it is parsed as shallow */ | |
366 | if (!parse_object(sha1)) | |
367 | die("error in object: %s", line); | |
368 | if (unregister_shallow(sha1)) | |
369 | die("no shallow found: %s", line); | |
370 | continue; | |
371 | } | |
372 | die("expected shallow/unshallow, got %s", line); | |
373 | } | |
374 | } else if (!args->stateless_rpc) | |
375 | send_request(args, fd[1], &req_buf); | |
376 | ||
377 | if (!args->stateless_rpc) { | |
378 | /* If we aren't using the stateless-rpc interface | |
379 | * we don't need to retain the headers. | |
380 | */ | |
381 | strbuf_setlen(&req_buf, 0); | |
382 | state_len = 0; | |
383 | } | |
384 | ||
385 | flushes = 0; | |
386 | retval = -1; | |
387 | while ((sha1 = get_rev())) { | |
388 | packet_buf_write(&req_buf, "have %s\n", sha1_to_hex(sha1)); | |
389 | if (args->verbose) | |
390 | fprintf(stderr, "have %s\n", sha1_to_hex(sha1)); | |
391 | in_vain++; | |
392 | if (flush_at <= ++count) { | |
393 | int ack; | |
394 | ||
395 | packet_buf_flush(&req_buf); | |
396 | send_request(args, fd[1], &req_buf); | |
397 | strbuf_setlen(&req_buf, state_len); | |
398 | flushes++; | |
399 | flush_at = next_flush(args, count); | |
400 | ||
401 | /* | |
402 | * We keep one window "ahead" of the other side, and | |
403 | * will wait for an ACK only on the next one | |
404 | */ | |
405 | if (!args->stateless_rpc && count == INITIAL_FLUSH) | |
406 | continue; | |
407 | ||
408 | consume_shallow_list(args, fd[0]); | |
409 | do { | |
410 | ack = get_ack(fd[0], result_sha1); | |
411 | if (args->verbose && ack) | |
412 | fprintf(stderr, "got ack %d %s\n", ack, | |
413 | sha1_to_hex(result_sha1)); | |
414 | switch (ack) { | |
415 | case ACK: | |
416 | flushes = 0; | |
417 | multi_ack = 0; | |
418 | retval = 0; | |
419 | goto done; | |
420 | case ACK_common: | |
421 | case ACK_ready: | |
422 | case ACK_continue: { | |
423 | struct commit *commit = | |
424 | lookup_commit(result_sha1); | |
425 | if (!commit) | |
426 | die("invalid commit %s", sha1_to_hex(result_sha1)); | |
427 | if (args->stateless_rpc | |
428 | && ack == ACK_common | |
429 | && !(commit->object.flags & COMMON)) { | |
430 | /* We need to replay the have for this object | |
431 | * on the next RPC request so the peer knows | |
432 | * it is in common with us. | |
433 | */ | |
434 | const char *hex = sha1_to_hex(result_sha1); | |
435 | packet_buf_write(&req_buf, "have %s\n", hex); | |
436 | state_len = req_buf.len; | |
437 | } | |
438 | mark_common(commit, 0, 1); | |
439 | retval = 0; | |
440 | in_vain = 0; | |
441 | got_continue = 1; | |
442 | if (ack == ACK_ready) { | |
443 | rev_list = NULL; | |
444 | got_ready = 1; | |
445 | } | |
446 | break; | |
447 | } | |
448 | } | |
449 | } while (ack); | |
450 | flushes--; | |
451 | if (got_continue && MAX_IN_VAIN < in_vain) { | |
452 | if (args->verbose) | |
453 | fprintf(stderr, "giving up\n"); | |
454 | break; /* give up */ | |
455 | } | |
456 | } | |
457 | } | |
458 | done: | |
459 | if (!got_ready || !no_done) { | |
460 | packet_buf_write(&req_buf, "done\n"); | |
461 | send_request(args, fd[1], &req_buf); | |
462 | } | |
463 | if (args->verbose) | |
464 | fprintf(stderr, "done\n"); | |
465 | if (retval != 0) { | |
466 | multi_ack = 0; | |
467 | flushes++; | |
468 | } | |
469 | strbuf_release(&req_buf); | |
470 | ||
471 | consume_shallow_list(args, fd[0]); | |
472 | while (flushes || multi_ack) { | |
473 | int ack = get_ack(fd[0], result_sha1); | |
474 | if (ack) { | |
475 | if (args->verbose) | |
476 | fprintf(stderr, "got ack (%d) %s\n", ack, | |
477 | sha1_to_hex(result_sha1)); | |
478 | if (ack == ACK) | |
479 | return 0; | |
480 | multi_ack = 1; | |
481 | continue; | |
482 | } | |
483 | flushes--; | |
484 | } | |
485 | /* it is no error to fetch into a completely empty repo */ | |
486 | return count ? retval : 0; | |
487 | } | |
488 | ||
489 | static struct commit_list *complete; | |
490 | ||
491 | static int mark_complete(const char *refname, const unsigned char *sha1, int flag, void *cb_data) | |
492 | { | |
493 | struct object *o = parse_object(sha1); | |
494 | ||
495 | while (o && o->type == OBJ_TAG) { | |
496 | struct tag *t = (struct tag *) o; | |
497 | if (!t->tagged) | |
498 | break; /* broken repository */ | |
499 | o->flags |= COMPLETE; | |
500 | o = parse_object(t->tagged->sha1); | |
501 | } | |
502 | if (o && o->type == OBJ_COMMIT) { | |
503 | struct commit *commit = (struct commit *)o; | |
504 | if (!(commit->object.flags & COMPLETE)) { | |
505 | commit->object.flags |= COMPLETE; | |
506 | commit_list_insert_by_date(commit, &complete); | |
507 | } | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static void mark_recent_complete_commits(struct fetch_pack_args *args, | |
513 | unsigned long cutoff) | |
514 | { | |
515 | while (complete && cutoff <= complete->item->date) { | |
516 | if (args->verbose) | |
517 | fprintf(stderr, "Marking %s as complete\n", | |
518 | sha1_to_hex(complete->item->object.sha1)); | |
519 | pop_most_recent_commit(&complete, COMPLETE); | |
520 | } | |
521 | } | |
522 | ||
523 | static int non_matching_ref(struct string_list_item *item, void *unused) | |
524 | { | |
525 | if (item->util) { | |
526 | item->util = NULL; | |
527 | return 0; | |
528 | } | |
529 | else | |
530 | return 1; | |
531 | } | |
532 | ||
533 | static void filter_refs(struct fetch_pack_args *args, | |
534 | struct ref **refs, struct string_list *sought) | |
535 | { | |
536 | struct ref *newlist = NULL; | |
537 | struct ref **newtail = &newlist; | |
538 | struct ref *ref, *next; | |
539 | int sought_pos; | |
540 | ||
541 | sought_pos = 0; | |
542 | for (ref = *refs; ref; ref = next) { | |
543 | int keep = 0; | |
544 | next = ref->next; | |
545 | if (!memcmp(ref->name, "refs/", 5) && | |
546 | check_refname_format(ref->name + 5, 0)) | |
547 | ; /* trash */ | |
548 | else { | |
549 | while (sought_pos < sought->nr) { | |
550 | int cmp = strcmp(ref->name, sought->items[sought_pos].string); | |
551 | if (cmp < 0) | |
552 | break; /* definitely do not have it */ | |
553 | else if (cmp == 0) { | |
554 | keep = 1; /* definitely have it */ | |
555 | sought->items[sought_pos++].util = "matched"; | |
556 | break; | |
557 | } | |
558 | else | |
559 | sought_pos++; /* might have it; keep looking */ | |
560 | } | |
561 | } | |
562 | ||
563 | if (! keep && args->fetch_all && | |
564 | (!args->depth || prefixcmp(ref->name, "refs/tags/"))) | |
565 | keep = 1; | |
566 | ||
567 | if (keep) { | |
568 | *newtail = ref; | |
569 | ref->next = NULL; | |
570 | newtail = &ref->next; | |
571 | } else { | |
572 | free(ref); | |
573 | } | |
574 | } | |
575 | ||
576 | filter_string_list(sought, 0, non_matching_ref, NULL); | |
577 | *refs = newlist; | |
578 | } | |
579 | ||
580 | static void mark_alternate_complete(const struct ref *ref, void *unused) | |
581 | { | |
582 | mark_complete(NULL, ref->old_sha1, 0, NULL); | |
583 | } | |
584 | ||
585 | static int everything_local(struct fetch_pack_args *args, | |
586 | struct ref **refs, struct string_list *sought) | |
587 | { | |
588 | struct ref *ref; | |
589 | int retval; | |
590 | unsigned long cutoff = 0; | |
591 | ||
592 | save_commit_buffer = 0; | |
593 | ||
594 | for (ref = *refs; ref; ref = ref->next) { | |
595 | struct object *o; | |
596 | ||
597 | o = parse_object(ref->old_sha1); | |
598 | if (!o) | |
599 | continue; | |
600 | ||
601 | /* We already have it -- which may mean that we were | |
602 | * in sync with the other side at some time after | |
603 | * that (it is OK if we guess wrong here). | |
604 | */ | |
605 | if (o->type == OBJ_COMMIT) { | |
606 | struct commit *commit = (struct commit *)o; | |
607 | if (!cutoff || cutoff < commit->date) | |
608 | cutoff = commit->date; | |
609 | } | |
610 | } | |
611 | ||
612 | if (!args->depth) { | |
613 | for_each_ref(mark_complete, NULL); | |
614 | for_each_alternate_ref(mark_alternate_complete, NULL); | |
615 | if (cutoff) | |
616 | mark_recent_complete_commits(args, cutoff); | |
617 | } | |
618 | ||
619 | /* | |
620 | * Mark all complete remote refs as common refs. | |
621 | * Don't mark them common yet; the server has to be told so first. | |
622 | */ | |
623 | for (ref = *refs; ref; ref = ref->next) { | |
624 | struct object *o = deref_tag(lookup_object(ref->old_sha1), | |
625 | NULL, 0); | |
626 | ||
627 | if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE)) | |
628 | continue; | |
629 | ||
630 | if (!(o->flags & SEEN)) { | |
631 | rev_list_push((struct commit *)o, COMMON_REF | SEEN); | |
632 | ||
633 | mark_common((struct commit *)o, 1, 1); | |
634 | } | |
635 | } | |
636 | ||
637 | filter_refs(args, refs, sought); | |
638 | ||
639 | for (retval = 1, ref = *refs; ref ; ref = ref->next) { | |
640 | const unsigned char *remote = ref->old_sha1; | |
641 | unsigned char local[20]; | |
642 | struct object *o; | |
643 | ||
644 | o = lookup_object(remote); | |
645 | if (!o || !(o->flags & COMPLETE)) { | |
646 | retval = 0; | |
647 | if (!args->verbose) | |
648 | continue; | |
649 | fprintf(stderr, | |
650 | "want %s (%s)\n", sha1_to_hex(remote), | |
651 | ref->name); | |
652 | continue; | |
653 | } | |
654 | ||
655 | hashcpy(ref->new_sha1, local); | |
656 | if (!args->verbose) | |
657 | continue; | |
658 | fprintf(stderr, | |
659 | "already have %s (%s)\n", sha1_to_hex(remote), | |
660 | ref->name); | |
661 | } | |
662 | return retval; | |
663 | } | |
664 | ||
665 | static int sideband_demux(int in, int out, void *data) | |
666 | { | |
667 | int *xd = data; | |
668 | ||
669 | int ret = recv_sideband("fetch-pack", xd[0], out); | |
670 | close(out); | |
671 | return ret; | |
672 | } | |
673 | ||
674 | static int get_pack(struct fetch_pack_args *args, | |
675 | int xd[2], char **pack_lockfile) | |
676 | { | |
677 | struct async demux; | |
678 | const char *argv[20]; | |
679 | char keep_arg[256]; | |
680 | char hdr_arg[256]; | |
681 | const char **av; | |
682 | int do_keep = args->keep_pack; | |
683 | struct child_process cmd; | |
684 | ||
685 | memset(&demux, 0, sizeof(demux)); | |
686 | if (use_sideband) { | |
687 | /* xd[] is talking with upload-pack; subprocess reads from | |
688 | * xd[0], spits out band#2 to stderr, and feeds us band#1 | |
689 | * through demux->out. | |
690 | */ | |
691 | demux.proc = sideband_demux; | |
692 | demux.data = xd; | |
693 | demux.out = -1; | |
694 | if (start_async(&demux)) | |
695 | die("fetch-pack: unable to fork off sideband" | |
696 | " demultiplexer"); | |
697 | } | |
698 | else | |
699 | demux.out = xd[0]; | |
700 | ||
701 | memset(&cmd, 0, sizeof(cmd)); | |
702 | cmd.argv = argv; | |
703 | av = argv; | |
704 | *hdr_arg = 0; | |
705 | if (!args->keep_pack && unpack_limit) { | |
706 | struct pack_header header; | |
707 | ||
708 | if (read_pack_header(demux.out, &header)) | |
709 | die("protocol error: bad pack header"); | |
710 | snprintf(hdr_arg, sizeof(hdr_arg), | |
711 | "--pack_header=%"PRIu32",%"PRIu32, | |
712 | ntohl(header.hdr_version), ntohl(header.hdr_entries)); | |
713 | if (ntohl(header.hdr_entries) < unpack_limit) | |
714 | do_keep = 0; | |
715 | else | |
716 | do_keep = 1; | |
717 | } | |
718 | ||
719 | if (do_keep) { | |
720 | if (pack_lockfile) | |
721 | cmd.out = -1; | |
722 | *av++ = "index-pack"; | |
723 | *av++ = "--stdin"; | |
724 | if (!args->quiet && !args->no_progress) | |
725 | *av++ = "-v"; | |
726 | if (args->use_thin_pack) | |
727 | *av++ = "--fix-thin"; | |
728 | if (args->lock_pack || unpack_limit) { | |
729 | int s = sprintf(keep_arg, | |
730 | "--keep=fetch-pack %"PRIuMAX " on ", (uintmax_t) getpid()); | |
731 | if (gethostname(keep_arg + s, sizeof(keep_arg) - s)) | |
732 | strcpy(keep_arg + s, "localhost"); | |
733 | *av++ = keep_arg; | |
734 | } | |
735 | } | |
736 | else { | |
737 | *av++ = "unpack-objects"; | |
738 | if (args->quiet || args->no_progress) | |
739 | *av++ = "-q"; | |
740 | } | |
741 | if (*hdr_arg) | |
742 | *av++ = hdr_arg; | |
743 | if (fetch_fsck_objects >= 0 | |
744 | ? fetch_fsck_objects | |
745 | : transfer_fsck_objects >= 0 | |
746 | ? transfer_fsck_objects | |
747 | : 0) | |
748 | *av++ = "--strict"; | |
749 | *av++ = NULL; | |
750 | ||
751 | cmd.in = demux.out; | |
752 | cmd.git_cmd = 1; | |
753 | if (start_command(&cmd)) | |
754 | die("fetch-pack: unable to fork off %s", argv[0]); | |
755 | if (do_keep && pack_lockfile) { | |
756 | *pack_lockfile = index_pack_lockfile(cmd.out); | |
757 | close(cmd.out); | |
758 | } | |
759 | ||
760 | if (finish_command(&cmd)) | |
761 | die("%s failed", argv[0]); | |
762 | if (use_sideband && finish_async(&demux)) | |
763 | die("error in sideband demultiplexer"); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static struct ref *do_fetch_pack(struct fetch_pack_args *args, | |
768 | int fd[2], | |
769 | const struct ref *orig_ref, | |
770 | struct string_list *sought, | |
771 | char **pack_lockfile) | |
772 | { | |
773 | struct ref *ref = copy_ref_list(orig_ref); | |
774 | unsigned char sha1[20]; | |
775 | const char *agent_feature; | |
776 | int agent_len; | |
777 | ||
778 | sort_ref_list(&ref, ref_compare_name); | |
779 | ||
780 | if (is_repository_shallow() && !server_supports("shallow")) | |
781 | die("Server does not support shallow clients"); | |
782 | if (server_supports("multi_ack_detailed")) { | |
783 | if (args->verbose) | |
784 | fprintf(stderr, "Server supports multi_ack_detailed\n"); | |
785 | multi_ack = 2; | |
786 | if (server_supports("no-done")) { | |
787 | if (args->verbose) | |
788 | fprintf(stderr, "Server supports no-done\n"); | |
789 | if (args->stateless_rpc) | |
790 | no_done = 1; | |
791 | } | |
792 | } | |
793 | else if (server_supports("multi_ack")) { | |
794 | if (args->verbose) | |
795 | fprintf(stderr, "Server supports multi_ack\n"); | |
796 | multi_ack = 1; | |
797 | } | |
798 | if (server_supports("side-band-64k")) { | |
799 | if (args->verbose) | |
800 | fprintf(stderr, "Server supports side-band-64k\n"); | |
801 | use_sideband = 2; | |
802 | } | |
803 | else if (server_supports("side-band")) { | |
804 | if (args->verbose) | |
805 | fprintf(stderr, "Server supports side-band\n"); | |
806 | use_sideband = 1; | |
807 | } | |
808 | if (!server_supports("thin-pack")) | |
809 | args->use_thin_pack = 0; | |
810 | if (!server_supports("no-progress")) | |
811 | args->no_progress = 0; | |
812 | if (!server_supports("include-tag")) | |
813 | args->include_tag = 0; | |
814 | if (server_supports("ofs-delta")) { | |
815 | if (args->verbose) | |
816 | fprintf(stderr, "Server supports ofs-delta\n"); | |
817 | } else | |
818 | prefer_ofs_delta = 0; | |
819 | ||
820 | if ((agent_feature = server_feature_value("agent", &agent_len))) { | |
821 | agent_supported = 1; | |
822 | if (args->verbose && agent_len) | |
823 | fprintf(stderr, "Server version is %.*s\n", | |
824 | agent_len, agent_feature); | |
825 | } | |
826 | ||
827 | if (everything_local(args, &ref, sought)) { | |
828 | packet_flush(fd[1]); | |
829 | goto all_done; | |
830 | } | |
831 | if (find_common(args, fd, sha1, ref) < 0) | |
832 | if (!args->keep_pack) | |
833 | /* When cloning, it is not unusual to have | |
834 | * no common commit. | |
835 | */ | |
836 | warning("no common commits"); | |
837 | ||
838 | if (args->stateless_rpc) | |
839 | packet_flush(fd[1]); | |
840 | if (get_pack(args, fd, pack_lockfile)) | |
841 | die("git fetch-pack: fetch failed."); | |
842 | ||
843 | all_done: | |
844 | return ref; | |
845 | } | |
846 | ||
847 | static int fetch_pack_config(const char *var, const char *value, void *cb) | |
848 | { | |
849 | if (strcmp(var, "fetch.unpacklimit") == 0) { | |
850 | fetch_unpack_limit = git_config_int(var, value); | |
851 | return 0; | |
852 | } | |
853 | ||
854 | if (strcmp(var, "transfer.unpacklimit") == 0) { | |
855 | transfer_unpack_limit = git_config_int(var, value); | |
856 | return 0; | |
857 | } | |
858 | ||
859 | if (strcmp(var, "repack.usedeltabaseoffset") == 0) { | |
860 | prefer_ofs_delta = git_config_bool(var, value); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | if (!strcmp(var, "fetch.fsckobjects")) { | |
865 | fetch_fsck_objects = git_config_bool(var, value); | |
866 | return 0; | |
867 | } | |
868 | ||
869 | if (!strcmp(var, "transfer.fsckobjects")) { | |
870 | transfer_fsck_objects = git_config_bool(var, value); | |
871 | return 0; | |
872 | } | |
873 | ||
874 | return git_default_config(var, value, cb); | |
875 | } | |
876 | ||
877 | static struct lock_file lock; | |
878 | ||
879 | static void fetch_pack_setup(void) | |
880 | { | |
881 | static int did_setup; | |
882 | if (did_setup) | |
883 | return; | |
884 | git_config(fetch_pack_config, NULL); | |
885 | if (0 <= transfer_unpack_limit) | |
886 | unpack_limit = transfer_unpack_limit; | |
887 | else if (0 <= fetch_unpack_limit) | |
888 | unpack_limit = fetch_unpack_limit; | |
889 | did_setup = 1; | |
890 | } | |
891 | ||
892 | struct ref *fetch_pack(struct fetch_pack_args *args, | |
893 | int fd[], struct child_process *conn, | |
894 | const struct ref *ref, | |
895 | const char *dest, | |
896 | struct string_list *sought, | |
897 | char **pack_lockfile) | |
898 | { | |
899 | struct stat st; | |
900 | struct ref *ref_cpy; | |
901 | ||
902 | fetch_pack_setup(); | |
903 | if (args->depth > 0) { | |
904 | if (stat(git_path("shallow"), &st)) | |
905 | st.st_mtime = 0; | |
906 | } | |
907 | ||
908 | if (sought->nr) { | |
909 | sort_string_list(sought); | |
910 | string_list_remove_duplicates(sought, 0); | |
911 | } | |
912 | ||
913 | if (!ref) { | |
914 | packet_flush(fd[1]); | |
915 | die("no matching remote head"); | |
916 | } | |
917 | ref_cpy = do_fetch_pack(args, fd, ref, sought, pack_lockfile); | |
918 | ||
919 | if (args->depth > 0) { | |
920 | struct cache_time mtime; | |
921 | struct strbuf sb = STRBUF_INIT; | |
922 | char *shallow = git_path("shallow"); | |
923 | int fd; | |
924 | ||
925 | mtime.sec = st.st_mtime; | |
926 | mtime.nsec = ST_MTIME_NSEC(st); | |
927 | if (stat(shallow, &st)) { | |
928 | if (mtime.sec) | |
929 | die("shallow file was removed during fetch"); | |
930 | } else if (st.st_mtime != mtime.sec | |
931 | #ifdef USE_NSEC | |
932 | || ST_MTIME_NSEC(st) != mtime.nsec | |
933 | #endif | |
934 | ) | |
935 | die("shallow file was changed during fetch"); | |
936 | ||
937 | fd = hold_lock_file_for_update(&lock, shallow, | |
938 | LOCK_DIE_ON_ERROR); | |
939 | if (!write_shallow_commits(&sb, 0) | |
940 | || write_in_full(fd, sb.buf, sb.len) != sb.len) { | |
941 | unlink_or_warn(shallow); | |
942 | rollback_lock_file(&lock); | |
943 | } else { | |
944 | commit_lock_file(&lock); | |
945 | } | |
946 | strbuf_release(&sb); | |
947 | } | |
948 | ||
949 | reprepare_packed_git(); | |
950 | return ref_cpy; | |
951 | } |