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"
12static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
14/* bits #0..7 in revision.h, #8..10 in commit.c */
16#define THEY_HAVE (1u << 11)
17#define OUR_REF (1u << 12)
18#define WANTED (1u << 13)
19#define COMMON_KNOWN (1u << 14)
20#define REACHABLE (1u << 15)
21#define SHALLOW (1u << 16)
23#define NOT_SHALLOW (1u << 17)
24#define CLIENT_SHALLOW (1u << 18)
25static unsigned long oldest_have;
27static int multi_ack, nr_our_refs;
29static int use_thin_pack, use_ofs_delta;
30static struct object_array have_obj;
31static struct object_array want_obj;
32static unsigned int timeout;
33/* 0 for no sideband,
34 * otherwise maximum packet size (up to 65520 bytes).
35 */
36static int use_sideband;
37static void reset_timeout(void)
39{
40 alarm(timeout);
41}
42static int strip(char *line, int len)
44{
45 if (len && line[len-1] == '\n')
46 line[--len] = 0;
47 return len;
48}
49static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
51{
52 if (use_sideband)
53 return send_sideband(1, fd, data, sz, use_sideband);
54 if (fd == 3)
55 /* emergency quit */
56 fd = 2;
57 if (fd == 2) {
58 xwrite(fd, data, sz);
59 return sz;
60 }
61 return safe_write(fd, data, sz);
62}
63FILE *pack_pipe = NULL;
65static void show_commit(struct commit *commit)
66{
67 if (commit->object.flags & BOUNDARY)
68 fputc('-', pack_pipe);
69 if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
70 die("broken output pipe");
71 fputc('\n', pack_pipe);
72 fflush(pack_pipe);
73 free(commit->buffer);
74 commit->buffer = NULL;
75}
76static void show_object(struct object_array_entry *p)
78{
79 /* An object with name "foo\n0000000..." can be used to
80 * confuse downstream git-pack-objects very badly.
81 */
82 const char *ep = strchr(p->name, '\n');
83 if (ep) {
84 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
85 (int) (ep - p->name),
86 p->name);
87 }
88 else
89 fprintf(pack_pipe, "%s %s\n",
90 sha1_to_hex(p->item->sha1), p->name);
91}
92static void show_edge(struct commit *commit)
94{
95 fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
96}
97static void create_pack_file(void)
99{
100 /* Pipes between rev-list to pack-objects, pack-objects to us
101 * and pack-objects error stream for progress bar.
102 */
103 int lp_pipe[2], pu_pipe[2], pe_pipe[2];
104 pid_t pid_rev_list, pid_pack_objects;
105 int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
106 char data[8193], progress[128];
107 char abort_msg[] = "aborting due to possible repository "
108 "corruption on the remote side.";
109 int buffered = -1;
110 if (pipe(lp_pipe) < 0)
112 die("git-upload-pack: unable to create pipe");
113 pid_rev_list = fork();
114 if (pid_rev_list < 0)
115 die("git-upload-pack: unable to fork git-rev-list");
116 if (!pid_rev_list) {
118 int i;
119 struct rev_info revs;
120 pack_pipe = fdopen(lp_pipe[1], "w");
122 if (create_full_pack)
124 use_thin_pack = 0; /* no point doing it */
125 init_revisions(&revs, NULL);
126 revs.tag_objects = 1;
127 revs.tree_objects = 1;
128 revs.blob_objects = 1;
129 if (use_thin_pack)
130 revs.edge_hint = 1;
131 if (create_full_pack) {
133 const char *args[] = {"rev-list", "--all", NULL};
134 setup_revisions(2, args, &revs, NULL);
135 } else {
136 for (i = 0; i < want_obj.nr; i++) {
137 struct object *o = want_obj.objects[i].item;
138 /* why??? */
139 o->flags &= ~UNINTERESTING;
140 add_pending_object(&revs, o, NULL);
141 }
142 for (i = 0; i < have_obj.nr; i++) {
143 struct object *o = have_obj.objects[i].item;
144 o->flags |= UNINTERESTING;
145 add_pending_object(&revs, o, NULL);
146 }
147 setup_revisions(0, NULL, &revs, NULL);
148 }
149 prepare_revision_walk(&revs);
150 mark_edges_uninteresting(revs.commits, &revs, show_edge);
151 traverse_commit_list(&revs, show_commit, show_object);
152 exit(0);
153 }
154 if (pipe(pu_pipe) < 0)
156 die("git-upload-pack: unable to create pipe");
157 if (pipe(pe_pipe) < 0)
158 die("git-upload-pack: unable to create pipe");
159 pid_pack_objects = fork();
160 if (pid_pack_objects < 0) {
161 /* daemon sets things up to ignore TERM */
162 kill(pid_rev_list, SIGKILL);
163 die("git-upload-pack: unable to fork git-pack-objects");
164 }
165 if (!pid_pack_objects) {
166 dup2(lp_pipe[0], 0);
167 dup2(pu_pipe[1], 1);
168 dup2(pe_pipe[1], 2);
169 close(lp_pipe[0]);
171 close(lp_pipe[1]);
172 close(pu_pipe[0]);
173 close(pu_pipe[1]);
174 close(pe_pipe[0]);
175 close(pe_pipe[1]);
176 execl_git_cmd("pack-objects", "--stdout", "--progress",
177 use_ofs_delta ? "--delta-base-offset" : NULL,
178 NULL);
179 kill(pid_rev_list, SIGKILL);
180 die("git-upload-pack: unable to exec git-pack-objects");
181 }
182 close(lp_pipe[0]);
184 close(lp_pipe[1]);
185 /* We read from pe_pipe[0] to capture stderr output for
187 * progress bar, and pu_pipe[0] to capture the pack data.
188 */
189 close(pe_pipe[1]);
190 close(pu_pipe[1]);
191 while (1) {
193 const char *who;
194 struct pollfd pfd[2];
195 pid_t pid;
196 int status;
197 ssize_t sz;
198 int pe, pu, pollsize;
199 reset_timeout();
201 pollsize = 0;
203 pe = pu = -1;
204 if (0 <= pu_pipe[0]) {
206 pfd[pollsize].fd = pu_pipe[0];
207 pfd[pollsize].events = POLLIN;
208 pu = pollsize;
209 pollsize++;
210 }
211 if (0 <= pe_pipe[0]) {
212 pfd[pollsize].fd = pe_pipe[0];
213 pfd[pollsize].events = POLLIN;
214 pe = pollsize;
215 pollsize++;
216 }
217 if (pollsize) {
219 if (poll(pfd, pollsize, -1) < 0) {
220 if (errno != EINTR) {
221 error("poll failed, resuming: %s",
222 strerror(errno));
223 sleep(1);
224 }
225 continue;
226 }
227 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
228 /* Data ready; we keep the last byte
229 * to ourselves in case we detect
230 * broken rev-list, so that we can
231 * leave the stream corrupted. This
232 * is unfortunate -- unpack-objects
233 * would happily accept a valid pack
234 * data with trailing garbage, so
235 * appending garbage after we pass all
236 * the pack data is not good enough to
237 * signal breakage to downstream.
238 */
239 char *cp = data;
240 ssize_t outsz = 0;
241 if (0 <= buffered) {
242 *cp++ = buffered;
243 outsz++;
244 }
245 sz = xread(pu_pipe[0], cp,
246 sizeof(data) - outsz);
247 if (0 < sz)
248 ;
249 else if (sz == 0) {
250 close(pu_pipe[0]);
251 pu_pipe[0] = -1;
252 }
253 else
254 goto fail;
255 sz += outsz;
256 if (1 < sz) {
257 buffered = data[sz-1] & 0xFF;
258 sz--;
259 }
260 else
261 buffered = -1;
262 sz = send_client_data(1, data, sz);
263 if (sz < 0)
264 goto fail;
265 }
266 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
267 /* Status ready; we ship that in the side-band
268 * or dump to the standard error.
269 */
270 sz = xread(pe_pipe[0], progress,
271 sizeof(progress));
272 if (0 < sz)
273 send_client_data(2, progress, sz);
274 else if (sz == 0) {
275 close(pe_pipe[0]);
276 pe_pipe[0] = -1;
277 }
278 else
279 goto fail;
280 }
281 }
282 /* See if the children are still there */
284 if (pid_rev_list || pid_pack_objects) {
285 pid = waitpid(-1, &status, WNOHANG);
286 if (!pid)
287 continue;
288 who = ((pid == pid_rev_list) ? "git-rev-list" :
289 (pid == pid_pack_objects) ? "git-pack-objects" :
290 NULL);
291 if (!who) {
292 if (pid < 0) {
293 error("git-upload-pack: %s",
294 strerror(errno));
295 goto fail;
296 }
297 error("git-upload-pack: we weren't "
298 "waiting for %d", pid);
299 continue;
300 }
301 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
302 error("git-upload-pack: %s died with error.",
303 who);
304 goto fail;
305 }
306 if (pid == pid_rev_list)
307 pid_rev_list = 0;
308 if (pid == pid_pack_objects)
309 pid_pack_objects = 0;
310 if (pid_rev_list || pid_pack_objects)
311 continue;
312 }
313 /* both died happily */
315 if (pollsize)
316 continue;
317 /* flush the data */
319 if (0 <= buffered) {
320 data[0] = buffered;
321 sz = send_client_data(1, data, 1);
322 if (sz < 0)
323 goto fail;
324 fprintf(stderr, "flushed.\n");
325 }
326 if (use_sideband)
327 packet_flush(1);
328 return;
329 }
330 fail:
331 if (pid_pack_objects)
332 kill(pid_pack_objects, SIGKILL);
333 if (pid_rev_list)
334 kill(pid_rev_list, SIGKILL);
335 send_client_data(3, abort_msg, sizeof(abort_msg));
336 die("git-upload-pack: %s", abort_msg);
337}
338static int got_sha1(char *hex, unsigned char *sha1)
340{
341 struct object *o;
342 int we_knew_they_have = 0;
343 if (get_sha1_hex(hex, sha1))
345 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
346 if (!has_sha1_file(sha1))
347 return -1;
348 o = lookup_object(sha1);
350 if (!(o && o->parsed))
351 o = parse_object(sha1);
352 if (!o)
353 die("oops (%s)", sha1_to_hex(sha1));
354 if (o->type == OBJ_COMMIT) {
355 struct commit_list *parents;
356 struct commit *commit = (struct commit *)o;
357 if (o->flags & THEY_HAVE)
358 we_knew_they_have = 1;
359 else
360 o->flags |= THEY_HAVE;
361 if (!oldest_have || (commit->date < oldest_have))
362 oldest_have = commit->date;
363 for (parents = commit->parents;
364 parents;
365 parents = parents->next)
366 parents->item->object.flags |= THEY_HAVE;
367 }
368 if (!we_knew_they_have) {
369 add_object_array(o, NULL, &have_obj);
370 return 1;
371 }
372 return 0;
373}
374static int reachable(struct commit *want)
376{
377 struct commit_list *work = NULL;
378 insert_by_date(want, &work);
380 while (work) {
381 struct commit_list *list = work->next;
382 struct commit *commit = work->item;
383 free(work);
384 work = list;
385 if (commit->object.flags & THEY_HAVE) {
387 want->object.flags |= COMMON_KNOWN;
388 break;
389 }
390 if (!commit->object.parsed)
391 parse_object(commit->object.sha1);
392 if (commit->object.flags & REACHABLE)
393 continue;
394 commit->object.flags |= REACHABLE;
395 if (commit->date < oldest_have)
396 continue;
397 for (list = commit->parents; list; list = list->next) {
398 struct commit *parent = list->item;
399 if (!(parent->object.flags & REACHABLE))
400 insert_by_date(parent, &work);
401 }
402 }
403 want->object.flags |= REACHABLE;
404 clear_commit_marks(want, REACHABLE);
405 free_commit_list(work);
406 return (want->object.flags & COMMON_KNOWN);
407}
408static int ok_to_give_up(void)
410{
411 int i;
412 if (!have_obj.nr)
414 return 0;
415 for (i = 0; i < want_obj.nr; i++) {
417 struct object *want = want_obj.objects[i].item;
418 if (want->flags & COMMON_KNOWN)
420 continue;
421 want = deref_tag(want, "a want line", 0);
422 if (!want || want->type != OBJ_COMMIT) {
423 /* no way to tell if this is reachable by
424 * looking at the ancestry chain alone, so
425 * leave a note to ourselves not to worry about
426 * this object anymore.
427 */
428 want_obj.objects[i].item->flags |= COMMON_KNOWN;
429 continue;
430 }
431 if (!reachable((struct commit *)want))
432 return 0;
433 }
434 return 1;
435}
436static int get_common_commits(void)
438{
439 static char line[1000];
440 unsigned char sha1[20];
441 char hex[41], last_hex[41];
442 int len;
443 track_object_refs = 0;
445 save_commit_buffer = 0;
446 for(;;) {
448 len = packet_read_line(0, line, sizeof(line));
449 reset_timeout();
450 if (!len) {
452 if (have_obj.nr == 0 || multi_ack)
453 packet_write(1, "NAK\n");
454 continue;
455 }
456 len = strip(line, len);
457 if (!strncmp(line, "have ", 5)) {
458 switch (got_sha1(line+5, sha1)) {
459 case -1: /* they have what we do not */
460 if (multi_ack && ok_to_give_up())
461 packet_write(1, "ACK %s continue\n",
462 sha1_to_hex(sha1));
463 break;
464 default:
465 memcpy(hex, sha1_to_hex(sha1), 41);
466 if (multi_ack) {
467 const char *msg = "ACK %s continue\n";
468 packet_write(1, msg, hex);
469 memcpy(last_hex, hex, 41);
470 }
471 else if (have_obj.nr == 1)
472 packet_write(1, "ACK %s\n", hex);
473 break;
474 }
475 continue;
476 }
477 if (!strcmp(line, "done")) {
478 if (have_obj.nr > 0) {
479 if (multi_ack)
480 packet_write(1, "ACK %s\n", last_hex);
481 return 0;
482 }
483 packet_write(1, "NAK\n");
484 return -1;
485 }
486 die("git-upload-pack: expected SHA1 list, got '%s'", line);
487 }
488}
489static void receive_needs(void)
491{
492 struct object_array shallows = {0, 0, NULL};
493 static char line[1000];
494 int len, depth = 0;
495 for (;;) {
497 struct object *o;
498 unsigned char sha1_buf[20];
499 len = packet_read_line(0, line, sizeof(line));
500 reset_timeout();
501 if (!len)
502 break;
503 if (!strncmp("shallow ", line, 8)) {
505 unsigned char sha1[20];
506 struct object *object;
507 use_thin_pack = 0;
508 if (get_sha1(line + 8, sha1))
509 die("invalid shallow line: %s", line);
510 object = parse_object(sha1);
511 if (!object)
512 die("did not find object for %s", line);
513 object->flags |= CLIENT_SHALLOW;
514 add_object_array(object, NULL, &shallows);
515 continue;
516 }
517 if (!strncmp("deepen ", line, 7)) {
518 char *end;
519 use_thin_pack = 0;
520 depth = strtol(line + 7, &end, 0);
521 if (end == line + 7 || depth <= 0)
522 die("Invalid deepen: %s", line);
523 continue;
524 }
525 if (strncmp("want ", line, 5) ||
526 get_sha1_hex(line+5, sha1_buf))
527 die("git-upload-pack: protocol error, "
528 "expected to get sha, not '%s'", line);
529 if (strstr(line+45, "multi_ack"))
530 multi_ack = 1;
531 if (strstr(line+45, "thin-pack"))
532 use_thin_pack = 1;
533 if (strstr(line+45, "ofs-delta"))
534 use_ofs_delta = 1;
535 if (strstr(line+45, "side-band-64k"))
536 use_sideband = LARGE_PACKET_MAX;
537 else if (strstr(line+45, "side-band"))
538 use_sideband = DEFAULT_PACKET_MAX;
539 /* We have sent all our refs already, and the other end
541 * should have chosen out of them; otherwise they are
542 * asking for nonsense.
543 *
544 * Hmph. We may later want to allow "want" line that
545 * asks for something like "master~10" (symbolic)...
546 * would it make sense? I don't know.
547 */
548 o = lookup_object(sha1_buf);
549 if (!o || !(o->flags & OUR_REF))
550 die("git-upload-pack: not our ref %s", line+5);
551 if (!(o->flags & WANTED)) {
552 o->flags |= WANTED;
553 add_object_array(o, NULL, &want_obj);
554 }
555 }
556 if (depth == 0 && shallows.nr == 0)
557 return;
558 if (depth > 0) {
559 struct commit_list *result, *backup;
560 int i;
561 backup = result = get_shallow_commits(&want_obj, depth,
562 SHALLOW, NOT_SHALLOW);
563 while (result) {
564 struct object *object = &result->item->object;
565 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
566 packet_write(1, "shallow %s",
567 sha1_to_hex(object->sha1));
568 register_shallow(object->sha1);
569 }
570 result = result->next;
571 }
572 free_commit_list(backup);
573 for (i = 0; i < shallows.nr; i++) {
574 struct object *object = shallows.objects[i].item;
575 if (object->flags & NOT_SHALLOW) {
576 struct commit_list *parents;
577 packet_write(1, "unshallow %s",
578 sha1_to_hex(object->sha1));
579 object->flags &= ~CLIENT_SHALLOW;
580 /* make sure the real parents are parsed */
581 unregister_shallow(object->sha1);
582 object->parsed = 0;
583 parse_commit((struct commit *)object);
584 parents = ((struct commit *)object)->parents;
585 while (parents) {
586 add_object_array(&parents->item->object,
587 NULL, &want_obj);
588 parents = parents->next;
589 }
590 }
591 /* make sure commit traversal conforms to client */
592 register_shallow(object->sha1);
593 }
594 packet_flush(1);
595 } else
596 if (shallows.nr > 0) {
597 int i;
598 for (i = 0; i < shallows.nr; i++)
599 register_shallow(shallows.objects[i].item->sha1);
600 }
601 free(shallows.objects);
602}
603static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
605{
606 static const char *capabilities = "multi_ack thin-pack side-band"
607 " side-band-64k ofs-delta shallow";
608 struct object *o = parse_object(sha1);
609 if (!o)
611 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
612 if (capabilities)
614 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
615 0, capabilities);
616 else
617 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
618 capabilities = NULL;
619 if (!(o->flags & OUR_REF)) {
620 o->flags |= OUR_REF;
621 nr_our_refs++;
622 }
623 if (o->type == OBJ_TAG) {
624 o = deref_tag(o, refname, 0);
625 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
626 }
627 return 0;
628}
629static void upload_pack(void)
631{
632 reset_timeout();
633 head_ref(send_ref, NULL);
634 for_each_ref(send_ref, NULL);
635 packet_flush(1);
636 receive_needs();
637 if (want_obj.nr) {
638 get_common_commits();
639 create_pack_file();
640 }
641}
642int main(int argc, char **argv)
644{
645 char *dir;
646 int i;
647 int strict = 0;
648 for (i = 1; i < argc; i++) {
650 char *arg = argv[i];
651 if (arg[0] != '-')
653 break;
654 if (!strcmp(arg, "--strict")) {
655 strict = 1;
656 continue;
657 }
658 if (!strncmp(arg, "--timeout=", 10)) {
659 timeout = atoi(arg+10);
660 continue;
661 }
662 if (!strcmp(arg, "--")) {
663 i++;
664 break;
665 }
666 }
667
668 if (i != argc-1)
669 usage(upload_pack_usage);
670 dir = argv[i];
671 if (!enter_repo(dir, strict))
673 die("'%s': unable to chdir or not a git archive", dir);
674 upload_pack();
676 return 0;
677}