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1 | #include "cache.h" | |
2 | #include "refs.h" | |
3 | #include "pkt-line.h" | |
4 | #include "sideband.h" | |
5 | #include "tag.h" | |
6 | #include "object.h" | |
7 | #include "commit.h" | |
8 | #include "exec_cmd.h" | |
9 | #include "diff.h" | |
10 | #include "revision.h" | |
11 | #include "list-objects.h" | |
12 | #include "run-command.h" | |
13 | ||
14 | static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>"; | |
15 | ||
16 | /* bits #0..7 in revision.h, #8..10 in commit.c */ | |
17 | #define THEY_HAVE (1u << 11) | |
18 | #define OUR_REF (1u << 12) | |
19 | #define WANTED (1u << 13) | |
20 | #define COMMON_KNOWN (1u << 14) | |
21 | #define REACHABLE (1u << 15) | |
22 | ||
23 | #define SHALLOW (1u << 16) | |
24 | #define NOT_SHALLOW (1u << 17) | |
25 | #define CLIENT_SHALLOW (1u << 18) | |
26 | ||
27 | static unsigned long oldest_have; | |
28 | ||
29 | static int multi_ack, nr_our_refs; | |
30 | static int use_thin_pack, use_ofs_delta, no_progress; | |
31 | static struct object_array have_obj; | |
32 | static struct object_array want_obj; | |
33 | static unsigned int timeout; | |
34 | /* 0 for no sideband, | |
35 | * otherwise maximum packet size (up to 65520 bytes). | |
36 | */ | |
37 | static int use_sideband; | |
38 | ||
39 | static void reset_timeout(void) | |
40 | { | |
41 | alarm(timeout); | |
42 | } | |
43 | ||
44 | static int strip(char *line, int len) | |
45 | { | |
46 | if (len && line[len-1] == '\n') | |
47 | line[--len] = 0; | |
48 | return len; | |
49 | } | |
50 | ||
51 | static ssize_t send_client_data(int fd, const char *data, ssize_t sz) | |
52 | { | |
53 | if (use_sideband) | |
54 | return send_sideband(1, fd, data, sz, use_sideband); | |
55 | if (fd == 3) | |
56 | /* emergency quit */ | |
57 | fd = 2; | |
58 | if (fd == 2) { | |
59 | /* XXX: are we happy to lose stuff here? */ | |
60 | xwrite(fd, data, sz); | |
61 | return sz; | |
62 | } | |
63 | return safe_write(fd, data, sz); | |
64 | } | |
65 | ||
66 | static FILE *pack_pipe = NULL; | |
67 | static void show_commit(struct commit *commit) | |
68 | { | |
69 | if (commit->object.flags & BOUNDARY) | |
70 | fputc('-', pack_pipe); | |
71 | if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0) | |
72 | die("broken output pipe"); | |
73 | fputc('\n', pack_pipe); | |
74 | fflush(pack_pipe); | |
75 | free(commit->buffer); | |
76 | commit->buffer = NULL; | |
77 | } | |
78 | ||
79 | static void show_object(struct object_array_entry *p) | |
80 | { | |
81 | /* An object with name "foo\n0000000..." can be used to | |
82 | * confuse downstream git-pack-objects very badly. | |
83 | */ | |
84 | const char *ep = strchr(p->name, '\n'); | |
85 | if (ep) { | |
86 | fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1), | |
87 | (int) (ep - p->name), | |
88 | p->name); | |
89 | } | |
90 | else | |
91 | fprintf(pack_pipe, "%s %s\n", | |
92 | sha1_to_hex(p->item->sha1), p->name); | |
93 | } | |
94 | ||
95 | static void show_edge(struct commit *commit) | |
96 | { | |
97 | fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1)); | |
98 | } | |
99 | ||
100 | static int do_rev_list(int fd, void *create_full_pack) | |
101 | { | |
102 | int i; | |
103 | struct rev_info revs; | |
104 | ||
105 | pack_pipe = fdopen(fd, "w"); | |
106 | if (create_full_pack) | |
107 | use_thin_pack = 0; /* no point doing it */ | |
108 | init_revisions(&revs, NULL); | |
109 | revs.tag_objects = 1; | |
110 | revs.tree_objects = 1; | |
111 | revs.blob_objects = 1; | |
112 | if (use_thin_pack) | |
113 | revs.edge_hint = 1; | |
114 | ||
115 | if (create_full_pack) { | |
116 | const char *args[] = {"rev-list", "--all", NULL}; | |
117 | setup_revisions(2, args, &revs, NULL); | |
118 | } else { | |
119 | for (i = 0; i < want_obj.nr; i++) { | |
120 | struct object *o = want_obj.objects[i].item; | |
121 | /* why??? */ | |
122 | o->flags &= ~UNINTERESTING; | |
123 | add_pending_object(&revs, o, NULL); | |
124 | } | |
125 | for (i = 0; i < have_obj.nr; i++) { | |
126 | struct object *o = have_obj.objects[i].item; | |
127 | o->flags |= UNINTERESTING; | |
128 | add_pending_object(&revs, o, NULL); | |
129 | } | |
130 | setup_revisions(0, NULL, &revs, NULL); | |
131 | } | |
132 | prepare_revision_walk(&revs); | |
133 | mark_edges_uninteresting(revs.commits, &revs, show_edge); | |
134 | traverse_commit_list(&revs, show_commit, show_object); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static void create_pack_file(void) | |
139 | { | |
140 | struct async rev_list; | |
141 | struct child_process pack_objects; | |
142 | int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr); | |
143 | char data[8193], progress[128]; | |
144 | char abort_msg[] = "aborting due to possible repository " | |
145 | "corruption on the remote side."; | |
146 | int buffered = -1; | |
147 | ssize_t sz; | |
148 | const char *argv[10]; | |
149 | int arg = 0; | |
150 | ||
151 | rev_list.proc = do_rev_list; | |
152 | /* .data is just a boolean: any non-NULL value will do */ | |
153 | rev_list.data = create_full_pack ? &rev_list : NULL; | |
154 | if (start_async(&rev_list)) | |
155 | die("git-upload-pack: unable to fork git-rev-list"); | |
156 | ||
157 | argv[arg++] = "pack-objects"; | |
158 | argv[arg++] = "--stdout"; | |
159 | if (!no_progress) | |
160 | argv[arg++] = "--progress"; | |
161 | if (use_ofs_delta) | |
162 | argv[arg++] = "--delta-base-offset"; | |
163 | argv[arg++] = NULL; | |
164 | ||
165 | memset(&pack_objects, 0, sizeof(pack_objects)); | |
166 | pack_objects.in = rev_list.out; /* start_command closes it */ | |
167 | pack_objects.out = -1; | |
168 | pack_objects.err = -1; | |
169 | pack_objects.git_cmd = 1; | |
170 | pack_objects.argv = argv; | |
171 | ||
172 | if (start_command(&pack_objects)) | |
173 | die("git-upload-pack: unable to fork git-pack-objects"); | |
174 | ||
175 | /* We read from pack_objects.err to capture stderr output for | |
176 | * progress bar, and pack_objects.out to capture the pack data. | |
177 | */ | |
178 | ||
179 | while (1) { | |
180 | struct pollfd pfd[2]; | |
181 | int pe, pu, pollsize; | |
182 | ||
183 | reset_timeout(); | |
184 | ||
185 | pollsize = 0; | |
186 | pe = pu = -1; | |
187 | ||
188 | if (0 <= pack_objects.out) { | |
189 | pfd[pollsize].fd = pack_objects.out; | |
190 | pfd[pollsize].events = POLLIN; | |
191 | pu = pollsize; | |
192 | pollsize++; | |
193 | } | |
194 | if (0 <= pack_objects.err) { | |
195 | pfd[pollsize].fd = pack_objects.err; | |
196 | pfd[pollsize].events = POLLIN; | |
197 | pe = pollsize; | |
198 | pollsize++; | |
199 | } | |
200 | ||
201 | if (!pollsize) | |
202 | break; | |
203 | ||
204 | if (poll(pfd, pollsize, -1) < 0) { | |
205 | if (errno != EINTR) { | |
206 | error("poll failed, resuming: %s", | |
207 | strerror(errno)); | |
208 | sleep(1); | |
209 | } | |
210 | continue; | |
211 | } | |
212 | if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) { | |
213 | /* Data ready; we keep the last byte to ourselves | |
214 | * in case we detect broken rev-list, so that we | |
215 | * can leave the stream corrupted. This is | |
216 | * unfortunate -- unpack-objects would happily | |
217 | * accept a valid packdata with trailing garbage, | |
218 | * so appending garbage after we pass all the | |
219 | * pack data is not good enough to signal | |
220 | * breakage to downstream. | |
221 | */ | |
222 | char *cp = data; | |
223 | ssize_t outsz = 0; | |
224 | if (0 <= buffered) { | |
225 | *cp++ = buffered; | |
226 | outsz++; | |
227 | } | |
228 | sz = xread(pack_objects.out, cp, | |
229 | sizeof(data) - outsz); | |
230 | if (0 < sz) | |
231 | ; | |
232 | else if (sz == 0) { | |
233 | close(pack_objects.out); | |
234 | pack_objects.out = -1; | |
235 | } | |
236 | else | |
237 | goto fail; | |
238 | sz += outsz; | |
239 | if (1 < sz) { | |
240 | buffered = data[sz-1] & 0xFF; | |
241 | sz--; | |
242 | } | |
243 | else | |
244 | buffered = -1; | |
245 | sz = send_client_data(1, data, sz); | |
246 | if (sz < 0) | |
247 | goto fail; | |
248 | } | |
249 | if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) { | |
250 | /* Status ready; we ship that in the side-band | |
251 | * or dump to the standard error. | |
252 | */ | |
253 | sz = xread(pack_objects.err, progress, | |
254 | sizeof(progress)); | |
255 | if (0 < sz) | |
256 | send_client_data(2, progress, sz); | |
257 | else if (sz == 0) { | |
258 | close(pack_objects.err); | |
259 | pack_objects.err = -1; | |
260 | } | |
261 | else | |
262 | goto fail; | |
263 | } | |
264 | } | |
265 | ||
266 | if (finish_command(&pack_objects)) { | |
267 | error("git-upload-pack: git-pack-objects died with error."); | |
268 | goto fail; | |
269 | } | |
270 | if (finish_async(&rev_list)) | |
271 | goto fail; /* error was already reported */ | |
272 | ||
273 | /* flush the data */ | |
274 | if (0 <= buffered) { | |
275 | data[0] = buffered; | |
276 | sz = send_client_data(1, data, 1); | |
277 | if (sz < 0) | |
278 | goto fail; | |
279 | fprintf(stderr, "flushed.\n"); | |
280 | } | |
281 | if (use_sideband) | |
282 | packet_flush(1); | |
283 | return; | |
284 | ||
285 | fail: | |
286 | send_client_data(3, abort_msg, sizeof(abort_msg)); | |
287 | die("git-upload-pack: %s", abort_msg); | |
288 | } | |
289 | ||
290 | static int got_sha1(char *hex, unsigned char *sha1) | |
291 | { | |
292 | struct object *o; | |
293 | int we_knew_they_have = 0; | |
294 | ||
295 | if (get_sha1_hex(hex, sha1)) | |
296 | die("git-upload-pack: expected SHA1 object, got '%s'", hex); | |
297 | if (!has_sha1_file(sha1)) | |
298 | return -1; | |
299 | ||
300 | o = lookup_object(sha1); | |
301 | if (!(o && o->parsed)) | |
302 | o = parse_object(sha1); | |
303 | if (!o) | |
304 | die("oops (%s)", sha1_to_hex(sha1)); | |
305 | if (o->type == OBJ_COMMIT) { | |
306 | struct commit_list *parents; | |
307 | struct commit *commit = (struct commit *)o; | |
308 | if (o->flags & THEY_HAVE) | |
309 | we_knew_they_have = 1; | |
310 | else | |
311 | o->flags |= THEY_HAVE; | |
312 | if (!oldest_have || (commit->date < oldest_have)) | |
313 | oldest_have = commit->date; | |
314 | for (parents = commit->parents; | |
315 | parents; | |
316 | parents = parents->next) | |
317 | parents->item->object.flags |= THEY_HAVE; | |
318 | } | |
319 | if (!we_knew_they_have) { | |
320 | add_object_array(o, NULL, &have_obj); | |
321 | return 1; | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int reachable(struct commit *want) | |
327 | { | |
328 | struct commit_list *work = NULL; | |
329 | ||
330 | insert_by_date(want, &work); | |
331 | while (work) { | |
332 | struct commit_list *list = work->next; | |
333 | struct commit *commit = work->item; | |
334 | free(work); | |
335 | work = list; | |
336 | ||
337 | if (commit->object.flags & THEY_HAVE) { | |
338 | want->object.flags |= COMMON_KNOWN; | |
339 | break; | |
340 | } | |
341 | if (!commit->object.parsed) | |
342 | parse_object(commit->object.sha1); | |
343 | if (commit->object.flags & REACHABLE) | |
344 | continue; | |
345 | commit->object.flags |= REACHABLE; | |
346 | if (commit->date < oldest_have) | |
347 | continue; | |
348 | for (list = commit->parents; list; list = list->next) { | |
349 | struct commit *parent = list->item; | |
350 | if (!(parent->object.flags & REACHABLE)) | |
351 | insert_by_date(parent, &work); | |
352 | } | |
353 | } | |
354 | want->object.flags |= REACHABLE; | |
355 | clear_commit_marks(want, REACHABLE); | |
356 | free_commit_list(work); | |
357 | return (want->object.flags & COMMON_KNOWN); | |
358 | } | |
359 | ||
360 | static int ok_to_give_up(void) | |
361 | { | |
362 | int i; | |
363 | ||
364 | if (!have_obj.nr) | |
365 | return 0; | |
366 | ||
367 | for (i = 0; i < want_obj.nr; i++) { | |
368 | struct object *want = want_obj.objects[i].item; | |
369 | ||
370 | if (want->flags & COMMON_KNOWN) | |
371 | continue; | |
372 | want = deref_tag(want, "a want line", 0); | |
373 | if (!want || want->type != OBJ_COMMIT) { | |
374 | /* no way to tell if this is reachable by | |
375 | * looking at the ancestry chain alone, so | |
376 | * leave a note to ourselves not to worry about | |
377 | * this object anymore. | |
378 | */ | |
379 | want_obj.objects[i].item->flags |= COMMON_KNOWN; | |
380 | continue; | |
381 | } | |
382 | if (!reachable((struct commit *)want)) | |
383 | return 0; | |
384 | } | |
385 | return 1; | |
386 | } | |
387 | ||
388 | static int get_common_commits(void) | |
389 | { | |
390 | static char line[1000]; | |
391 | unsigned char sha1[20]; | |
392 | char hex[41], last_hex[41]; | |
393 | int len; | |
394 | ||
395 | track_object_refs = 0; | |
396 | save_commit_buffer = 0; | |
397 | ||
398 | for(;;) { | |
399 | len = packet_read_line(0, line, sizeof(line)); | |
400 | reset_timeout(); | |
401 | ||
402 | if (!len) { | |
403 | if (have_obj.nr == 0 || multi_ack) | |
404 | packet_write(1, "NAK\n"); | |
405 | continue; | |
406 | } | |
407 | len = strip(line, len); | |
408 | if (!prefixcmp(line, "have ")) { | |
409 | switch (got_sha1(line+5, sha1)) { | |
410 | case -1: /* they have what we do not */ | |
411 | if (multi_ack && ok_to_give_up()) | |
412 | packet_write(1, "ACK %s continue\n", | |
413 | sha1_to_hex(sha1)); | |
414 | break; | |
415 | default: | |
416 | memcpy(hex, sha1_to_hex(sha1), 41); | |
417 | if (multi_ack) { | |
418 | const char *msg = "ACK %s continue\n"; | |
419 | packet_write(1, msg, hex); | |
420 | memcpy(last_hex, hex, 41); | |
421 | } | |
422 | else if (have_obj.nr == 1) | |
423 | packet_write(1, "ACK %s\n", hex); | |
424 | break; | |
425 | } | |
426 | continue; | |
427 | } | |
428 | if (!strcmp(line, "done")) { | |
429 | if (have_obj.nr > 0) { | |
430 | if (multi_ack) | |
431 | packet_write(1, "ACK %s\n", last_hex); | |
432 | return 0; | |
433 | } | |
434 | packet_write(1, "NAK\n"); | |
435 | return -1; | |
436 | } | |
437 | die("git-upload-pack: expected SHA1 list, got '%s'", line); | |
438 | } | |
439 | } | |
440 | ||
441 | static void receive_needs(void) | |
442 | { | |
443 | struct object_array shallows = {0, 0, NULL}; | |
444 | static char line[1000]; | |
445 | int len, depth = 0; | |
446 | ||
447 | for (;;) { | |
448 | struct object *o; | |
449 | unsigned char sha1_buf[20]; | |
450 | len = packet_read_line(0, line, sizeof(line)); | |
451 | reset_timeout(); | |
452 | if (!len) | |
453 | break; | |
454 | ||
455 | if (!prefixcmp(line, "shallow ")) { | |
456 | unsigned char sha1[20]; | |
457 | struct object *object; | |
458 | use_thin_pack = 0; | |
459 | if (get_sha1(line + 8, sha1)) | |
460 | die("invalid shallow line: %s", line); | |
461 | object = parse_object(sha1); | |
462 | if (!object) | |
463 | die("did not find object for %s", line); | |
464 | object->flags |= CLIENT_SHALLOW; | |
465 | add_object_array(object, NULL, &shallows); | |
466 | continue; | |
467 | } | |
468 | if (!prefixcmp(line, "deepen ")) { | |
469 | char *end; | |
470 | use_thin_pack = 0; | |
471 | depth = strtol(line + 7, &end, 0); | |
472 | if (end == line + 7 || depth <= 0) | |
473 | die("Invalid deepen: %s", line); | |
474 | continue; | |
475 | } | |
476 | if (prefixcmp(line, "want ") || | |
477 | get_sha1_hex(line+5, sha1_buf)) | |
478 | die("git-upload-pack: protocol error, " | |
479 | "expected to get sha, not '%s'", line); | |
480 | if (strstr(line+45, "multi_ack")) | |
481 | multi_ack = 1; | |
482 | if (strstr(line+45, "thin-pack")) | |
483 | use_thin_pack = 1; | |
484 | if (strstr(line+45, "ofs-delta")) | |
485 | use_ofs_delta = 1; | |
486 | if (strstr(line+45, "side-band-64k")) | |
487 | use_sideband = LARGE_PACKET_MAX; | |
488 | else if (strstr(line+45, "side-band")) | |
489 | use_sideband = DEFAULT_PACKET_MAX; | |
490 | if (strstr(line+45, "no-progress")) | |
491 | no_progress = 1; | |
492 | ||
493 | /* We have sent all our refs already, and the other end | |
494 | * should have chosen out of them; otherwise they are | |
495 | * asking for nonsense. | |
496 | * | |
497 | * Hmph. We may later want to allow "want" line that | |
498 | * asks for something like "master~10" (symbolic)... | |
499 | * would it make sense? I don't know. | |
500 | */ | |
501 | o = lookup_object(sha1_buf); | |
502 | if (!o || !(o->flags & OUR_REF)) | |
503 | die("git-upload-pack: not our ref %s", line+5); | |
504 | if (!(o->flags & WANTED)) { | |
505 | o->flags |= WANTED; | |
506 | add_object_array(o, NULL, &want_obj); | |
507 | } | |
508 | } | |
509 | if (depth == 0 && shallows.nr == 0) | |
510 | return; | |
511 | if (depth > 0) { | |
512 | struct commit_list *result, *backup; | |
513 | int i; | |
514 | backup = result = get_shallow_commits(&want_obj, depth, | |
515 | SHALLOW, NOT_SHALLOW); | |
516 | while (result) { | |
517 | struct object *object = &result->item->object; | |
518 | if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) { | |
519 | packet_write(1, "shallow %s", | |
520 | sha1_to_hex(object->sha1)); | |
521 | register_shallow(object->sha1); | |
522 | } | |
523 | result = result->next; | |
524 | } | |
525 | free_commit_list(backup); | |
526 | for (i = 0; i < shallows.nr; i++) { | |
527 | struct object *object = shallows.objects[i].item; | |
528 | if (object->flags & NOT_SHALLOW) { | |
529 | struct commit_list *parents; | |
530 | packet_write(1, "unshallow %s", | |
531 | sha1_to_hex(object->sha1)); | |
532 | object->flags &= ~CLIENT_SHALLOW; | |
533 | /* make sure the real parents are parsed */ | |
534 | unregister_shallow(object->sha1); | |
535 | object->parsed = 0; | |
536 | parse_commit((struct commit *)object); | |
537 | parents = ((struct commit *)object)->parents; | |
538 | while (parents) { | |
539 | add_object_array(&parents->item->object, | |
540 | NULL, &want_obj); | |
541 | parents = parents->next; | |
542 | } | |
543 | } | |
544 | /* make sure commit traversal conforms to client */ | |
545 | register_shallow(object->sha1); | |
546 | } | |
547 | packet_flush(1); | |
548 | } else | |
549 | if (shallows.nr > 0) { | |
550 | int i; | |
551 | for (i = 0; i < shallows.nr; i++) | |
552 | register_shallow(shallows.objects[i].item->sha1); | |
553 | } | |
554 | free(shallows.objects); | |
555 | } | |
556 | ||
557 | static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) | |
558 | { | |
559 | static const char *capabilities = "multi_ack thin-pack side-band" | |
560 | " side-band-64k ofs-delta shallow no-progress"; | |
561 | struct object *o = parse_object(sha1); | |
562 | ||
563 | if (!o) | |
564 | die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1)); | |
565 | ||
566 | if (capabilities) | |
567 | packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname, | |
568 | 0, capabilities); | |
569 | else | |
570 | packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname); | |
571 | capabilities = NULL; | |
572 | if (!(o->flags & OUR_REF)) { | |
573 | o->flags |= OUR_REF; | |
574 | nr_our_refs++; | |
575 | } | |
576 | if (o->type == OBJ_TAG) { | |
577 | o = deref_tag(o, refname, 0); | |
578 | packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname); | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static void upload_pack(void) | |
584 | { | |
585 | reset_timeout(); | |
586 | head_ref(send_ref, NULL); | |
587 | for_each_ref(send_ref, NULL); | |
588 | packet_flush(1); | |
589 | receive_needs(); | |
590 | if (want_obj.nr) { | |
591 | get_common_commits(); | |
592 | create_pack_file(); | |
593 | } | |
594 | } | |
595 | ||
596 | int main(int argc, char **argv) | |
597 | { | |
598 | char *dir; | |
599 | int i; | |
600 | int strict = 0; | |
601 | ||
602 | for (i = 1; i < argc; i++) { | |
603 | char *arg = argv[i]; | |
604 | ||
605 | if (arg[0] != '-') | |
606 | break; | |
607 | if (!strcmp(arg, "--strict")) { | |
608 | strict = 1; | |
609 | continue; | |
610 | } | |
611 | if (!prefixcmp(arg, "--timeout=")) { | |
612 | timeout = atoi(arg+10); | |
613 | continue; | |
614 | } | |
615 | if (!strcmp(arg, "--")) { | |
616 | i++; | |
617 | break; | |
618 | } | |
619 | } | |
620 | ||
621 | if (i != argc-1) | |
622 | usage(upload_pack_usage); | |
623 | dir = argv[i]; | |
624 | ||
625 | if (!enter_repo(dir, strict)) | |
626 | die("'%s': unable to chdir or not a git archive", dir); | |
627 | if (is_repository_shallow()) | |
628 | die("attempt to fetch/clone from a shallow repository"); | |
629 | upload_pack(); | |
630 | return 0; | |
631 | } |