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"
13static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
15/* 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#define SHALLOW (1u << 16)
24#define NOT_SHALLOW (1u << 17)
25#define CLIENT_SHALLOW (1u << 18)
26static unsigned long oldest_have;
28static int multi_ack, nr_our_refs;
30static int use_thin_pack, use_ofs_delta, no_progress;
31static struct object_array have_obj;
32static struct object_array want_obj;
33static unsigned int timeout;
34/* 0 for no sideband,
35 * otherwise maximum packet size (up to 65520 bytes).
36 */
37static int use_sideband;
38static void reset_timeout(void)
40{
41 alarm(timeout);
42}
43static int strip(char *line, int len)
45{
46 if (len && line[len-1] == '\n')
47 line[--len] = 0;
48 return len;
49}
50static 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}
65static FILE *pack_pipe = NULL;
67static 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}
78static 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}
94static void show_edge(struct commit *commit)
96{
97 fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
98}
99static void create_pack_file(void)
101{
102 /* Pipe from rev-list to pack-objects
103 */
104 int lp_pipe[2];
105 pid_t pid_rev_list;
106 struct child_process pack_objects;
107 int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
108 char data[8193], progress[128];
109 char abort_msg[] = "aborting due to possible repository "
110 "corruption on the remote side.";
111 int buffered = -1;
112 const char *argv[10];
113 int arg = 0;
114 if (pipe(lp_pipe) < 0)
116 die("git-upload-pack: unable to create pipe");
117 pid_rev_list = fork();
118 if (pid_rev_list < 0)
119 die("git-upload-pack: unable to fork git-rev-list");
120 if (!pid_rev_list) {
122 int i;
123 struct rev_info revs;
124 close(lp_pipe[0]);
126 pack_pipe = fdopen(lp_pipe[1], "w");
127 if (create_full_pack)
129 use_thin_pack = 0; /* no point doing it */
130 init_revisions(&revs, NULL);
131 revs.tag_objects = 1;
132 revs.tree_objects = 1;
133 revs.blob_objects = 1;
134 if (use_thin_pack)
135 revs.edge_hint = 1;
136 if (create_full_pack) {
138 const char *args[] = {"rev-list", "--all", NULL};
139 setup_revisions(2, args, &revs, NULL);
140 } else {
141 for (i = 0; i < want_obj.nr; i++) {
142 struct object *o = want_obj.objects[i].item;
143 /* why??? */
144 o->flags &= ~UNINTERESTING;
145 add_pending_object(&revs, o, NULL);
146 }
147 for (i = 0; i < have_obj.nr; i++) {
148 struct object *o = have_obj.objects[i].item;
149 o->flags |= UNINTERESTING;
150 add_pending_object(&revs, o, NULL);
151 }
152 setup_revisions(0, NULL, &revs, NULL);
153 }
154 prepare_revision_walk(&revs);
155 mark_edges_uninteresting(revs.commits, &revs, show_edge);
156 traverse_commit_list(&revs, show_commit, show_object);
157 exit(0);
158 }
159 /* writable pipe end must not be inherited by pack_objects */
161 close(lp_pipe[1]);
162 argv[arg++] = "pack-objects";
164 argv[arg++] = "--stdout";
165 if (!no_progress)
166 argv[arg++] = "--progress";
167 if (use_ofs_delta)
168 argv[arg++] = "--delta-base-offset";
169 argv[arg++] = NULL;
170 memset(&pack_objects, 0, sizeof(pack_objects));
172 pack_objects.in = lp_pipe[0]; /* start_command closes it */
173 pack_objects.out = -1;
174 pack_objects.err = -1;
175 pack_objects.git_cmd = 1;
176 pack_objects.argv = argv;
177 if (start_command(&pack_objects)) {
178 /* daemon sets things up to ignore TERM */
179 kill(pid_rev_list, SIGKILL);
180 die("git-upload-pack: unable to fork git-pack-objects");
181 }
182 /* We read from pack_objects.err to capture stderr output for
184 * progress bar, and pack_objects.out to capture the pack data.
185 */
186 while (1) {
188 const char *who;
189 struct pollfd pfd[2];
190 pid_t pid;
191 int status;
192 ssize_t sz;
193 int pe, pu, pollsize;
194 reset_timeout();
196 pollsize = 0;
198 pe = pu = -1;
199 if (0 <= pack_objects.out) {
201 pfd[pollsize].fd = pack_objects.out;
202 pfd[pollsize].events = POLLIN;
203 pu = pollsize;
204 pollsize++;
205 }
206 if (0 <= pack_objects.err) {
207 pfd[pollsize].fd = pack_objects.err;
208 pfd[pollsize].events = POLLIN;
209 pe = pollsize;
210 pollsize++;
211 }
212 if (pollsize) {
214 if (poll(pfd, pollsize, -1) < 0) {
215 if (errno != EINTR) {
216 error("poll failed, resuming: %s",
217 strerror(errno));
218 sleep(1);
219 }
220 continue;
221 }
222 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
223 /* Data ready; we keep the last byte
224 * to ourselves in case we detect
225 * broken rev-list, so that we can
226 * leave the stream corrupted. This
227 * is unfortunate -- unpack-objects
228 * would happily accept a valid pack
229 * data with trailing garbage, so
230 * appending garbage after we pass all
231 * the pack data is not good enough to
232 * signal breakage to downstream.
233 */
234 char *cp = data;
235 ssize_t outsz = 0;
236 if (0 <= buffered) {
237 *cp++ = buffered;
238 outsz++;
239 }
240 sz = xread(pack_objects.out, cp,
241 sizeof(data) - outsz);
242 if (0 < sz)
243 ;
244 else if (sz == 0) {
245 close(pack_objects.out);
246 pack_objects.out = -1;
247 }
248 else
249 goto fail;
250 sz += outsz;
251 if (1 < sz) {
252 buffered = data[sz-1] & 0xFF;
253 sz--;
254 }
255 else
256 buffered = -1;
257 sz = send_client_data(1, data, sz);
258 if (sz < 0)
259 goto fail;
260 }
261 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
262 /* Status ready; we ship that in the side-band
263 * or dump to the standard error.
264 */
265 sz = xread(pack_objects.err, progress,
266 sizeof(progress));
267 if (0 < sz)
268 send_client_data(2, progress, sz);
269 else if (sz == 0) {
270 close(pack_objects.err);
271 pack_objects.err = -1;
272 }
273 else
274 goto fail;
275 }
276 }
277 /* See if the children are still there */
279 if (pid_rev_list || pack_objects.pid) {
280 pid = waitpid(-1, &status, WNOHANG);
281 if (!pid)
282 continue;
283 who = ((pid == pid_rev_list) ? "git-rev-list" :
284 (pid == pack_objects.pid) ? "git-pack-objects" :
285 NULL);
286 if (!who) {
287 if (pid < 0) {
288 error("git-upload-pack: %s",
289 strerror(errno));
290 goto fail;
291 }
292 error("git-upload-pack: we weren't "
293 "waiting for %d", pid);
294 continue;
295 }
296 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
297 error("git-upload-pack: %s died with error.",
298 who);
299 goto fail;
300 }
301 if (pid == pid_rev_list)
302 pid_rev_list = 0;
303 if (pid == pack_objects.pid)
304 pack_objects.pid = 0;
305 if (pid_rev_list || pack_objects.pid)
306 continue;
307 }
308 /* both died happily */
310 if (pollsize)
311 continue;
312 /* flush the data */
314 if (0 <= buffered) {
315 data[0] = buffered;
316 sz = send_client_data(1, data, 1);
317 if (sz < 0)
318 goto fail;
319 fprintf(stderr, "flushed.\n");
320 }
321 if (use_sideband)
322 packet_flush(1);
323 return;
324 }
325 fail:
326 if (pack_objects.pid)
327 kill(pack_objects.pid, SIGKILL);
328 if (pid_rev_list)
329 kill(pid_rev_list, SIGKILL);
330 send_client_data(3, abort_msg, sizeof(abort_msg));
331 die("git-upload-pack: %s", abort_msg);
332}
333static int got_sha1(char *hex, unsigned char *sha1)
335{
336 struct object *o;
337 int we_knew_they_have = 0;
338 if (get_sha1_hex(hex, sha1))
340 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
341 if (!has_sha1_file(sha1))
342 return -1;
343 o = lookup_object(sha1);
345 if (!(o && o->parsed))
346 o = parse_object(sha1);
347 if (!o)
348 die("oops (%s)", sha1_to_hex(sha1));
349 if (o->type == OBJ_COMMIT) {
350 struct commit_list *parents;
351 struct commit *commit = (struct commit *)o;
352 if (o->flags & THEY_HAVE)
353 we_knew_they_have = 1;
354 else
355 o->flags |= THEY_HAVE;
356 if (!oldest_have || (commit->date < oldest_have))
357 oldest_have = commit->date;
358 for (parents = commit->parents;
359 parents;
360 parents = parents->next)
361 parents->item->object.flags |= THEY_HAVE;
362 }
363 if (!we_knew_they_have) {
364 add_object_array(o, NULL, &have_obj);
365 return 1;
366 }
367 return 0;
368}
369static int reachable(struct commit *want)
371{
372 struct commit_list *work = NULL;
373 insert_by_date(want, &work);
375 while (work) {
376 struct commit_list *list = work->next;
377 struct commit *commit = work->item;
378 free(work);
379 work = list;
380 if (commit->object.flags & THEY_HAVE) {
382 want->object.flags |= COMMON_KNOWN;
383 break;
384 }
385 if (!commit->object.parsed)
386 parse_object(commit->object.sha1);
387 if (commit->object.flags & REACHABLE)
388 continue;
389 commit->object.flags |= REACHABLE;
390 if (commit->date < oldest_have)
391 continue;
392 for (list = commit->parents; list; list = list->next) {
393 struct commit *parent = list->item;
394 if (!(parent->object.flags & REACHABLE))
395 insert_by_date(parent, &work);
396 }
397 }
398 want->object.flags |= REACHABLE;
399 clear_commit_marks(want, REACHABLE);
400 free_commit_list(work);
401 return (want->object.flags & COMMON_KNOWN);
402}
403static int ok_to_give_up(void)
405{
406 int i;
407 if (!have_obj.nr)
409 return 0;
410 for (i = 0; i < want_obj.nr; i++) {
412 struct object *want = want_obj.objects[i].item;
413 if (want->flags & COMMON_KNOWN)
415 continue;
416 want = deref_tag(want, "a want line", 0);
417 if (!want || want->type != OBJ_COMMIT) {
418 /* no way to tell if this is reachable by
419 * looking at the ancestry chain alone, so
420 * leave a note to ourselves not to worry about
421 * this object anymore.
422 */
423 want_obj.objects[i].item->flags |= COMMON_KNOWN;
424 continue;
425 }
426 if (!reachable((struct commit *)want))
427 return 0;
428 }
429 return 1;
430}
431static int get_common_commits(void)
433{
434 static char line[1000];
435 unsigned char sha1[20];
436 char hex[41], last_hex[41];
437 int len;
438 track_object_refs = 0;
440 save_commit_buffer = 0;
441 for(;;) {
443 len = packet_read_line(0, line, sizeof(line));
444 reset_timeout();
445 if (!len) {
447 if (have_obj.nr == 0 || multi_ack)
448 packet_write(1, "NAK\n");
449 continue;
450 }
451 len = strip(line, len);
452 if (!prefixcmp(line, "have ")) {
453 switch (got_sha1(line+5, sha1)) {
454 case -1: /* they have what we do not */
455 if (multi_ack && ok_to_give_up())
456 packet_write(1, "ACK %s continue\n",
457 sha1_to_hex(sha1));
458 break;
459 default:
460 memcpy(hex, sha1_to_hex(sha1), 41);
461 if (multi_ack) {
462 const char *msg = "ACK %s continue\n";
463 packet_write(1, msg, hex);
464 memcpy(last_hex, hex, 41);
465 }
466 else if (have_obj.nr == 1)
467 packet_write(1, "ACK %s\n", hex);
468 break;
469 }
470 continue;
471 }
472 if (!strcmp(line, "done")) {
473 if (have_obj.nr > 0) {
474 if (multi_ack)
475 packet_write(1, "ACK %s\n", last_hex);
476 return 0;
477 }
478 packet_write(1, "NAK\n");
479 return -1;
480 }
481 die("git-upload-pack: expected SHA1 list, got '%s'", line);
482 }
483}
484static void receive_needs(void)
486{
487 struct object_array shallows = {0, 0, NULL};
488 static char line[1000];
489 int len, depth = 0;
490 for (;;) {
492 struct object *o;
493 unsigned char sha1_buf[20];
494 len = packet_read_line(0, line, sizeof(line));
495 reset_timeout();
496 if (!len)
497 break;
498 if (!prefixcmp(line, "shallow ")) {
500 unsigned char sha1[20];
501 struct object *object;
502 use_thin_pack = 0;
503 if (get_sha1(line + 8, sha1))
504 die("invalid shallow line: %s", line);
505 object = parse_object(sha1);
506 if (!object)
507 die("did not find object for %s", line);
508 object->flags |= CLIENT_SHALLOW;
509 add_object_array(object, NULL, &shallows);
510 continue;
511 }
512 if (!prefixcmp(line, "deepen ")) {
513 char *end;
514 use_thin_pack = 0;
515 depth = strtol(line + 7, &end, 0);
516 if (end == line + 7 || depth <= 0)
517 die("Invalid deepen: %s", line);
518 continue;
519 }
520 if (prefixcmp(line, "want ") ||
521 get_sha1_hex(line+5, sha1_buf))
522 die("git-upload-pack: protocol error, "
523 "expected to get sha, not '%s'", line);
524 if (strstr(line+45, "multi_ack"))
525 multi_ack = 1;
526 if (strstr(line+45, "thin-pack"))
527 use_thin_pack = 1;
528 if (strstr(line+45, "ofs-delta"))
529 use_ofs_delta = 1;
530 if (strstr(line+45, "side-band-64k"))
531 use_sideband = LARGE_PACKET_MAX;
532 else if (strstr(line+45, "side-band"))
533 use_sideband = DEFAULT_PACKET_MAX;
534 if (strstr(line+45, "no-progress"))
535 no_progress = 1;
536 /* We have sent all our refs already, and the other end
538 * should have chosen out of them; otherwise they are
539 * asking for nonsense.
540 *
541 * Hmph. We may later want to allow "want" line that
542 * asks for something like "master~10" (symbolic)...
543 * would it make sense? I don't know.
544 */
545 o = lookup_object(sha1_buf);
546 if (!o || !(o->flags & OUR_REF))
547 die("git-upload-pack: not our ref %s", line+5);
548 if (!(o->flags & WANTED)) {
549 o->flags |= WANTED;
550 add_object_array(o, NULL, &want_obj);
551 }
552 }
553 if (depth == 0 && shallows.nr == 0)
554 return;
555 if (depth > 0) {
556 struct commit_list *result, *backup;
557 int i;
558 backup = result = get_shallow_commits(&want_obj, depth,
559 SHALLOW, NOT_SHALLOW);
560 while (result) {
561 struct object *object = &result->item->object;
562 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
563 packet_write(1, "shallow %s",
564 sha1_to_hex(object->sha1));
565 register_shallow(object->sha1);
566 }
567 result = result->next;
568 }
569 free_commit_list(backup);
570 for (i = 0; i < shallows.nr; i++) {
571 struct object *object = shallows.objects[i].item;
572 if (object->flags & NOT_SHALLOW) {
573 struct commit_list *parents;
574 packet_write(1, "unshallow %s",
575 sha1_to_hex(object->sha1));
576 object->flags &= ~CLIENT_SHALLOW;
577 /* make sure the real parents are parsed */
578 unregister_shallow(object->sha1);
579 object->parsed = 0;
580 parse_commit((struct commit *)object);
581 parents = ((struct commit *)object)->parents;
582 while (parents) {
583 add_object_array(&parents->item->object,
584 NULL, &want_obj);
585 parents = parents->next;
586 }
587 }
588 /* make sure commit traversal conforms to client */
589 register_shallow(object->sha1);
590 }
591 packet_flush(1);
592 } else
593 if (shallows.nr > 0) {
594 int i;
595 for (i = 0; i < shallows.nr; i++)
596 register_shallow(shallows.objects[i].item->sha1);
597 }
598 free(shallows.objects);
599}
600static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
602{
603 static const char *capabilities = "multi_ack thin-pack side-band"
604 " side-band-64k ofs-delta shallow no-progress";
605 struct object *o = parse_object(sha1);
606 if (!o)
608 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
609 if (capabilities)
611 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
612 0, capabilities);
613 else
614 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
615 capabilities = NULL;
616 if (!(o->flags & OUR_REF)) {
617 o->flags |= OUR_REF;
618 nr_our_refs++;
619 }
620 if (o->type == OBJ_TAG) {
621 o = deref_tag(o, refname, 0);
622 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
623 }
624 return 0;
625}
626static void upload_pack(void)
628{
629 reset_timeout();
630 head_ref(send_ref, NULL);
631 for_each_ref(send_ref, NULL);
632 packet_flush(1);
633 receive_needs();
634 if (want_obj.nr) {
635 get_common_commits();
636 create_pack_file();
637 }
638}
639int main(int argc, char **argv)
641{
642 char *dir;
643 int i;
644 int strict = 0;
645 for (i = 1; i < argc; i++) {
647 char *arg = argv[i];
648 if (arg[0] != '-')
650 break;
651 if (!strcmp(arg, "--strict")) {
652 strict = 1;
653 continue;
654 }
655 if (!prefixcmp(arg, "--timeout=")) {
656 timeout = atoi(arg+10);
657 continue;
658 }
659 if (!strcmp(arg, "--")) {
660 i++;
661 break;
662 }
663 }
664 if (i != argc-1)
666 usage(upload_pack_usage);
667 dir = argv[i];
668 if (!enter_repo(dir, strict))
670 die("'%s': unable to chdir or not a git archive", dir);
671 if (is_repository_shallow())
672 die("attempt to fetch/clone from a shallow repository");
673 upload_pack();
674 return 0;
675}