Merge branch 'cb/maint-orphan-merge-noclobber'
[git/kirr.git] / upload-pack.c
blobf05e4229d0d3a3ed34b4bba6636f4d333c74dc22
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"
14 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
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)
23 #define SHALLOW (1u << 16)
24 #define NOT_SHALLOW (1u << 17)
25 #define CLIENT_SHALLOW (1u << 18)
27 static unsigned long oldest_have;
29 static int multi_ack, nr_our_refs;
30 static int use_thin_pack, use_ofs_delta, use_include_tag;
31 static int no_progress, daemon_mode;
32 static int shallow_nr;
33 static struct object_array have_obj;
34 static struct object_array want_obj;
35 static struct object_array extra_edge_obj;
36 static unsigned int timeout;
37 /* 0 for no sideband,
38 * otherwise maximum packet size (up to 65520 bytes).
40 static int use_sideband;
41 static int debug_fd;
42 static int advertise_refs;
43 static int stateless_rpc;
45 static void reset_timeout(void)
47 alarm(timeout);
50 static int strip(char *line, int len)
52 if (len && line[len-1] == '\n')
53 line[--len] = 0;
54 return len;
57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
59 if (use_sideband)
60 return send_sideband(1, fd, data, sz, use_sideband);
61 if (fd == 3)
62 /* emergency quit */
63 fd = 2;
64 if (fd == 2) {
65 /* XXX: are we happy to lose stuff here? */
66 xwrite(fd, data, sz);
67 return sz;
69 return safe_write(fd, data, sz);
72 static FILE *pack_pipe = NULL;
73 static void show_commit(struct commit *commit, void *data)
75 if (commit->object.flags & BOUNDARY)
76 fputc('-', pack_pipe);
77 if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
78 die("broken output pipe");
79 fputc('\n', pack_pipe);
80 fflush(pack_pipe);
81 free(commit->buffer);
82 commit->buffer = NULL;
85 static void show_object(struct object *obj, const struct name_path *path, const char *component)
87 /* An object with name "foo\n0000000..." can be used to
88 * confuse downstream git-pack-objects very badly.
90 const char *name = path_name(path, component);
91 const char *ep = strchr(name, '\n');
92 if (ep) {
93 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
94 (int) (ep - name),
95 name);
97 else
98 fprintf(pack_pipe, "%s %s\n",
99 sha1_to_hex(obj->sha1), name);
100 free((char *)name);
103 static void show_edge(struct commit *commit)
105 fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
108 static int do_rev_list(int in, int out, void *user_data)
110 int i;
111 struct rev_info revs;
113 pack_pipe = xfdopen(out, "w");
114 init_revisions(&revs, NULL);
115 revs.tag_objects = 1;
116 revs.tree_objects = 1;
117 revs.blob_objects = 1;
118 if (use_thin_pack)
119 revs.edge_hint = 1;
121 for (i = 0; i < want_obj.nr; i++) {
122 struct object *o = want_obj.objects[i].item;
123 /* why??? */
124 o->flags &= ~UNINTERESTING;
125 add_pending_object(&revs, o, NULL);
127 for (i = 0; i < have_obj.nr; i++) {
128 struct object *o = have_obj.objects[i].item;
129 o->flags |= UNINTERESTING;
130 add_pending_object(&revs, o, NULL);
132 setup_revisions(0, NULL, &revs, NULL);
133 if (prepare_revision_walk(&revs))
134 die("revision walk setup failed");
135 mark_edges_uninteresting(revs.commits, &revs, show_edge);
136 if (use_thin_pack)
137 for (i = 0; i < extra_edge_obj.nr; i++)
138 fprintf(pack_pipe, "-%s\n", sha1_to_hex(
139 extra_edge_obj.objects[i].item->sha1));
140 traverse_commit_list(&revs, show_commit, show_object, NULL);
141 fflush(pack_pipe);
142 fclose(pack_pipe);
143 return 0;
146 static void create_pack_file(void)
148 struct async rev_list;
149 struct child_process pack_objects;
150 int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
151 char data[8193], progress[128];
152 char abort_msg[] = "aborting due to possible repository "
153 "corruption on the remote side.";
154 int buffered = -1;
155 ssize_t sz;
156 const char *argv[10];
157 int arg = 0;
159 if (shallow_nr) {
160 memset(&rev_list, 0, sizeof(rev_list));
161 rev_list.proc = do_rev_list;
162 rev_list.out = -1;
163 if (start_async(&rev_list))
164 die("git upload-pack: unable to fork git-rev-list");
165 argv[arg++] = "pack-objects";
166 } else {
167 argv[arg++] = "pack-objects";
168 argv[arg++] = "--revs";
169 if (create_full_pack)
170 argv[arg++] = "--all";
171 else if (use_thin_pack)
172 argv[arg++] = "--thin";
175 argv[arg++] = "--stdout";
176 if (!no_progress)
177 argv[arg++] = "--progress";
178 if (use_ofs_delta)
179 argv[arg++] = "--delta-base-offset";
180 if (use_include_tag)
181 argv[arg++] = "--include-tag";
182 argv[arg++] = NULL;
184 memset(&pack_objects, 0, sizeof(pack_objects));
185 pack_objects.in = shallow_nr ? rev_list.out : -1;
186 pack_objects.out = -1;
187 pack_objects.err = -1;
188 pack_objects.git_cmd = 1;
189 pack_objects.argv = argv;
191 if (start_command(&pack_objects))
192 die("git upload-pack: unable to fork git-pack-objects");
194 /* pass on revisions we (don't) want */
195 if (!shallow_nr) {
196 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
197 if (!create_full_pack) {
198 int i;
199 for (i = 0; i < want_obj.nr; i++)
200 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
201 fprintf(pipe_fd, "--not\n");
202 for (i = 0; i < have_obj.nr; i++)
203 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
206 fprintf(pipe_fd, "\n");
207 fflush(pipe_fd);
208 fclose(pipe_fd);
212 /* We read from pack_objects.err to capture stderr output for
213 * progress bar, and pack_objects.out to capture the pack data.
216 while (1) {
217 struct pollfd pfd[2];
218 int pe, pu, pollsize;
220 reset_timeout();
222 pollsize = 0;
223 pe = pu = -1;
225 if (0 <= pack_objects.out) {
226 pfd[pollsize].fd = pack_objects.out;
227 pfd[pollsize].events = POLLIN;
228 pu = pollsize;
229 pollsize++;
231 if (0 <= pack_objects.err) {
232 pfd[pollsize].fd = pack_objects.err;
233 pfd[pollsize].events = POLLIN;
234 pe = pollsize;
235 pollsize++;
238 if (!pollsize)
239 break;
241 if (poll(pfd, pollsize, -1) < 0) {
242 if (errno != EINTR) {
243 error("poll failed, resuming: %s",
244 strerror(errno));
245 sleep(1);
247 continue;
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.
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;
261 else
262 goto fail;
263 /* give priority to status messages */
264 continue;
266 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
267 /* Data ready; we keep the last byte to ourselves
268 * in case we detect broken rev-list, so that we
269 * can leave the stream corrupted. This is
270 * unfortunate -- unpack-objects would happily
271 * accept a valid packdata with trailing garbage,
272 * so appending garbage after we pass all the
273 * pack data is not good enough to signal
274 * breakage to downstream.
276 char *cp = data;
277 ssize_t outsz = 0;
278 if (0 <= buffered) {
279 *cp++ = buffered;
280 outsz++;
282 sz = xread(pack_objects.out, cp,
283 sizeof(data) - outsz);
284 if (0 < sz)
286 else if (sz == 0) {
287 close(pack_objects.out);
288 pack_objects.out = -1;
290 else
291 goto fail;
292 sz += outsz;
293 if (1 < sz) {
294 buffered = data[sz-1] & 0xFF;
295 sz--;
297 else
298 buffered = -1;
299 sz = send_client_data(1, data, sz);
300 if (sz < 0)
301 goto fail;
305 if (finish_command(&pack_objects)) {
306 error("git upload-pack: git-pack-objects died with error.");
307 goto fail;
309 if (shallow_nr && finish_async(&rev_list))
310 goto fail; /* error was already reported */
312 /* flush the data */
313 if (0 <= buffered) {
314 data[0] = buffered;
315 sz = send_client_data(1, data, 1);
316 if (sz < 0)
317 goto fail;
318 fprintf(stderr, "flushed.\n");
320 if (use_sideband)
321 packet_flush(1);
322 return;
324 fail:
325 send_client_data(3, abort_msg, sizeof(abort_msg));
326 die("git upload-pack: %s", abort_msg);
329 static int got_sha1(char *hex, unsigned char *sha1)
331 struct object *o;
332 int we_knew_they_have = 0;
334 if (get_sha1_hex(hex, sha1))
335 die("git upload-pack: expected SHA1 object, got '%s'", hex);
336 if (!has_sha1_file(sha1))
337 return -1;
339 o = lookup_object(sha1);
340 if (!(o && o->parsed))
341 o = parse_object(sha1);
342 if (!o)
343 die("oops (%s)", sha1_to_hex(sha1));
344 if (o->type == OBJ_COMMIT) {
345 struct commit_list *parents;
346 struct commit *commit = (struct commit *)o;
347 if (o->flags & THEY_HAVE)
348 we_knew_they_have = 1;
349 else
350 o->flags |= THEY_HAVE;
351 if (!oldest_have || (commit->date < oldest_have))
352 oldest_have = commit->date;
353 for (parents = commit->parents;
354 parents;
355 parents = parents->next)
356 parents->item->object.flags |= THEY_HAVE;
358 if (!we_knew_they_have) {
359 add_object_array(o, NULL, &have_obj);
360 return 1;
362 return 0;
365 static int reachable(struct commit *want)
367 struct commit_list *work = NULL;
369 insert_by_date(want, &work);
370 while (work) {
371 struct commit_list *list = work->next;
372 struct commit *commit = work->item;
373 free(work);
374 work = list;
376 if (commit->object.flags & THEY_HAVE) {
377 want->object.flags |= COMMON_KNOWN;
378 break;
380 if (!commit->object.parsed)
381 parse_object(commit->object.sha1);
382 if (commit->object.flags & REACHABLE)
383 continue;
384 commit->object.flags |= REACHABLE;
385 if (commit->date < oldest_have)
386 continue;
387 for (list = commit->parents; list; list = list->next) {
388 struct commit *parent = list->item;
389 if (!(parent->object.flags & REACHABLE))
390 insert_by_date(parent, &work);
393 want->object.flags |= REACHABLE;
394 clear_commit_marks(want, REACHABLE);
395 free_commit_list(work);
396 return (want->object.flags & COMMON_KNOWN);
399 static int ok_to_give_up(void)
401 int i;
403 if (!have_obj.nr)
404 return 0;
406 for (i = 0; i < want_obj.nr; i++) {
407 struct object *want = want_obj.objects[i].item;
409 if (want->flags & COMMON_KNOWN)
410 continue;
411 want = deref_tag(want, "a want line", 0);
412 if (!want || want->type != OBJ_COMMIT) {
413 /* no way to tell if this is reachable by
414 * looking at the ancestry chain alone, so
415 * leave a note to ourselves not to worry about
416 * this object anymore.
418 want_obj.objects[i].item->flags |= COMMON_KNOWN;
419 continue;
421 if (!reachable((struct commit *)want))
422 return 0;
424 return 1;
427 static int get_common_commits(void)
429 static char line[1000];
430 unsigned char sha1[20];
431 char last_hex[41];
433 save_commit_buffer = 0;
435 for (;;) {
436 int len = packet_read_line(0, line, sizeof(line));
437 reset_timeout();
439 if (!len) {
440 if (have_obj.nr == 0 || multi_ack)
441 packet_write(1, "NAK\n");
442 if (stateless_rpc)
443 exit(0);
444 continue;
446 strip(line, len);
447 if (!prefixcmp(line, "have ")) {
448 switch (got_sha1(line+5, sha1)) {
449 case -1: /* they have what we do not */
450 if (multi_ack && ok_to_give_up()) {
451 const char *hex = sha1_to_hex(sha1);
452 if (multi_ack == 2)
453 packet_write(1, "ACK %s ready\n", hex);
454 else
455 packet_write(1, "ACK %s continue\n", hex);
457 break;
458 default:
459 memcpy(last_hex, sha1_to_hex(sha1), 41);
460 if (multi_ack == 2)
461 packet_write(1, "ACK %s common\n", last_hex);
462 else if (multi_ack)
463 packet_write(1, "ACK %s continue\n", last_hex);
464 else if (have_obj.nr == 1)
465 packet_write(1, "ACK %s\n", last_hex);
466 break;
468 continue;
470 if (!strcmp(line, "done")) {
471 if (have_obj.nr > 0) {
472 if (multi_ack)
473 packet_write(1, "ACK %s\n", last_hex);
474 return 0;
476 packet_write(1, "NAK\n");
477 return -1;
479 die("git upload-pack: expected SHA1 list, got '%s'", line);
483 static void receive_needs(void)
485 struct object_array shallows = OBJECT_ARRAY_INIT;
486 static char line[1000];
487 int len, depth = 0;
489 shallow_nr = 0;
490 if (debug_fd)
491 write_str_in_full(debug_fd, "#S\n");
492 for (;;) {
493 struct object *o;
494 unsigned char sha1_buf[20];
495 len = packet_read_line(0, line, sizeof(line));
496 reset_timeout();
497 if (!len)
498 break;
499 if (debug_fd)
500 write_in_full(debug_fd, line, len);
502 if (!prefixcmp(line, "shallow ")) {
503 unsigned char sha1[20];
504 struct object *object;
505 if (get_sha1(line + 8, sha1))
506 die("invalid shallow line: %s", line);
507 object = parse_object(sha1);
508 if (!object)
509 die("did not find object for %s", line);
510 object->flags |= CLIENT_SHALLOW;
511 add_object_array(object, NULL, &shallows);
512 continue;
514 if (!prefixcmp(line, "deepen ")) {
515 char *end;
516 depth = strtol(line + 7, &end, 0);
517 if (end == line + 7 || depth <= 0)
518 die("Invalid deepen: %s", line);
519 continue;
521 if (prefixcmp(line, "want ") ||
522 get_sha1_hex(line+5, sha1_buf))
523 die("git upload-pack: protocol error, "
524 "expected to get sha, not '%s'", line);
525 if (strstr(line+45, "multi_ack_detailed"))
526 multi_ack = 2;
527 else if (strstr(line+45, "multi_ack"))
528 multi_ack = 1;
529 if (strstr(line+45, "thin-pack"))
530 use_thin_pack = 1;
531 if (strstr(line+45, "ofs-delta"))
532 use_ofs_delta = 1;
533 if (strstr(line+45, "side-band-64k"))
534 use_sideband = LARGE_PACKET_MAX;
535 else if (strstr(line+45, "side-band"))
536 use_sideband = DEFAULT_PACKET_MAX;
537 if (strstr(line+45, "no-progress"))
538 no_progress = 1;
539 if (strstr(line+45, "include-tag"))
540 use_include_tag = 1;
542 /* We have sent all our refs already, and the other end
543 * should have chosen out of them; otherwise they are
544 * asking for nonsense.
546 * Hmph. We may later want to allow "want" line that
547 * asks for something like "master~10" (symbolic)...
548 * would it make sense? I don't know.
550 o = lookup_object(sha1_buf);
551 if (!o || !(o->flags & OUR_REF))
552 die("git upload-pack: not our ref %s",
553 sha1_to_hex(sha1_buf));
554 if (!(o->flags & WANTED)) {
555 o->flags |= WANTED;
556 add_object_array(o, NULL, &want_obj);
559 if (debug_fd)
560 write_str_in_full(debug_fd, "#E\n");
562 if (!use_sideband && daemon_mode)
563 no_progress = 1;
565 if (depth == 0 && shallows.nr == 0)
566 return;
567 if (depth > 0) {
568 struct commit_list *result, *backup;
569 int i;
570 backup = result = get_shallow_commits(&want_obj, depth,
571 SHALLOW, NOT_SHALLOW);
572 while (result) {
573 struct object *object = &result->item->object;
574 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
575 packet_write(1, "shallow %s",
576 sha1_to_hex(object->sha1));
577 register_shallow(object->sha1);
578 shallow_nr++;
580 result = result->next;
582 free_commit_list(backup);
583 for (i = 0; i < shallows.nr; i++) {
584 struct object *object = shallows.objects[i].item;
585 if (object->flags & NOT_SHALLOW) {
586 struct commit_list *parents;
587 packet_write(1, "unshallow %s",
588 sha1_to_hex(object->sha1));
589 object->flags &= ~CLIENT_SHALLOW;
590 /* make sure the real parents are parsed */
591 unregister_shallow(object->sha1);
592 object->parsed = 0;
593 if (parse_commit((struct commit *)object))
594 die("invalid commit");
595 parents = ((struct commit *)object)->parents;
596 while (parents) {
597 add_object_array(&parents->item->object,
598 NULL, &want_obj);
599 parents = parents->next;
601 add_object_array(object, NULL, &extra_edge_obj);
603 /* make sure commit traversal conforms to client */
604 register_shallow(object->sha1);
606 packet_flush(1);
607 } else
608 if (shallows.nr > 0) {
609 int i;
610 for (i = 0; i < shallows.nr; i++)
611 register_shallow(shallows.objects[i].item->sha1);
614 shallow_nr += shallows.nr;
615 free(shallows.objects);
618 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
620 static const char *capabilities = "multi_ack thin-pack side-band"
621 " side-band-64k ofs-delta shallow no-progress"
622 " include-tag multi_ack_detailed";
623 struct object *o = parse_object(sha1);
625 if (!o)
626 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
628 if (capabilities)
629 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
630 0, capabilities);
631 else
632 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
633 capabilities = NULL;
634 if (!(o->flags & OUR_REF)) {
635 o->flags |= OUR_REF;
636 nr_our_refs++;
638 if (o->type == OBJ_TAG) {
639 o = deref_tag(o, refname, 0);
640 if (o)
641 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
643 return 0;
646 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
648 struct object *o = parse_object(sha1);
649 if (!o)
650 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
651 if (!(o->flags & OUR_REF)) {
652 o->flags |= OUR_REF;
653 nr_our_refs++;
655 return 0;
658 static void upload_pack(void)
660 if (advertise_refs || !stateless_rpc) {
661 reset_timeout();
662 head_ref(send_ref, NULL);
663 for_each_ref(send_ref, NULL);
664 packet_flush(1);
665 } else {
666 head_ref(mark_our_ref, NULL);
667 for_each_ref(mark_our_ref, NULL);
669 if (advertise_refs)
670 return;
672 receive_needs();
673 if (want_obj.nr) {
674 get_common_commits();
675 create_pack_file();
679 int main(int argc, char **argv)
681 char *dir;
682 int i;
683 int strict = 0;
685 git_extract_argv0_path(argv[0]);
686 read_replace_refs = 0;
688 for (i = 1; i < argc; i++) {
689 char *arg = argv[i];
691 if (arg[0] != '-')
692 break;
693 if (!strcmp(arg, "--advertise-refs")) {
694 advertise_refs = 1;
695 continue;
697 if (!strcmp(arg, "--stateless-rpc")) {
698 stateless_rpc = 1;
699 continue;
701 if (!strcmp(arg, "--strict")) {
702 strict = 1;
703 continue;
705 if (!prefixcmp(arg, "--timeout=")) {
706 timeout = atoi(arg+10);
707 daemon_mode = 1;
708 continue;
710 if (!strcmp(arg, "--")) {
711 i++;
712 break;
716 if (i != argc-1)
717 usage(upload_pack_usage);
719 setup_path();
721 dir = argv[i];
723 if (!enter_repo(dir, strict))
724 die("'%s' does not appear to be a git repository", dir);
725 if (is_repository_shallow())
726 die("attempt to fetch/clone from a shallow repository");
727 if (getenv("GIT_DEBUG_SEND_PACK"))
728 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
729 upload_pack();
730 return 0;