1#include <signal.h>
2#include <sys/wait.h>
3#include <sys/poll.h>
4#include "cache.h"
5#include "refs.h"
6#include "pkt-line.h"
7#include "sideband.h"
8#include "tag.h"
9#include "object.h"
10#include "commit.h"
11#include "exec_cmd.h"
12#include "diff.h"
13#include "revision.h"
14#include "list-objects.h"
15static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
17/* bits #0..7 in revision.h, #8..10 in commit.c */
19#define THEY_HAVE (1u << 11)
20#define OUR_REF (1u << 12)
21#define WANTED (1u << 13)
22#define COMMON_KNOWN (1u << 14)
23#define REACHABLE (1u << 15)
24#define SHALLOW (1u << 16)
26#define NOT_SHALLOW (1u << 17)
27#define CLIENT_SHALLOW (1u << 18)
28static unsigned long oldest_have;
30static int multi_ack, nr_our_refs;
32static int use_thin_pack, use_ofs_delta;
33static struct object_array have_obj;
34static struct object_array want_obj;
35static unsigned int timeout;
36/* 0 for no sideband,
37 * otherwise maximum packet size (up to 65520 bytes).
38 */
39static int use_sideband;
40static void reset_timeout(void)
42{
43 alarm(timeout);
44}
45static int strip(char *line, int len)
47{
48 if (len && line[len-1] == '\n')
49 line[--len] = 0;
50 return len;
51}
52static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
54{
55 if (use_sideband)
56 return send_sideband(1, fd, data, sz, use_sideband);
57 if (fd == 3)
58 /* emergency quit */
59 fd = 2;
60 if (fd == 2) {
61 xwrite(fd, data, sz);
62 return sz;
63 }
64 return safe_write(fd, data, sz);
65}
66FILE *pack_pipe = NULL;
68static void show_commit(struct commit *commit)
69{
70 if (commit->object.flags & BOUNDARY)
71 fputc('-', pack_pipe);
72 if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
73 die("broken output pipe");
74 fputc('\n', pack_pipe);
75 fflush(pack_pipe);
76 free(commit->buffer);
77 commit->buffer = NULL;
78}
79static void show_object(struct object_array_entry *p)
81{
82 /* An object with name "foo\n0000000..." can be used to
83 * confuse downstream git-pack-objects very badly.
84 */
85 const char *ep = strchr(p->name, '\n');
86 if (ep) {
87 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
88 (int) (ep - p->name),
89 p->name);
90 }
91 else
92 fprintf(pack_pipe, "%s %s\n",
93 sha1_to_hex(p->item->sha1), p->name);
94}
95static void show_edge(struct commit *commit)
97{
98 fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
99}
100static void create_pack_file(void)
102{
103 /* Pipes between rev-list to pack-objects, pack-objects to us
104 * and pack-objects error stream for progress bar.
105 */
106 int lp_pipe[2], pu_pipe[2], pe_pipe[2];
107 pid_t pid_rev_list, pid_pack_objects;
108 int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
109 char data[8193], progress[128];
110 char abort_msg[] = "aborting due to possible repository "
111 "corruption on the remote side.";
112 int buffered = -1;
113 if (pipe(lp_pipe) < 0)
115 die("git-upload-pack: unable to create pipe");
116 pid_rev_list = fork();
117 if (pid_rev_list < 0)
118 die("git-upload-pack: unable to fork git-rev-list");
119 if (!pid_rev_list) {
121 int i;
122 struct rev_info revs;
123 pack_pipe = fdopen(lp_pipe[1], "w");
125 if (create_full_pack)
127 use_thin_pack = 0; /* no point doing it */
128 init_revisions(&revs, NULL);
129 revs.tag_objects = 1;
130 revs.tree_objects = 1;
131 revs.blob_objects = 1;
132 if (use_thin_pack)
133 revs.edge_hint = 1;
134 if (create_full_pack) {
136 const char *args[] = {"rev-list", "--all", NULL};
137 setup_revisions(2, args, &revs, NULL);
138 } else {
139 for (i = 0; i < want_obj.nr; i++) {
140 struct object *o = want_obj.objects[i].item;
141 /* why??? */
142 o->flags &= ~UNINTERESTING;
143 add_pending_object(&revs, o, NULL);
144 }
145 for (i = 0; i < have_obj.nr; i++) {
146 struct object *o = have_obj.objects[i].item;
147 o->flags |= UNINTERESTING;
148 add_pending_object(&revs, o, NULL);
149 }
150 setup_revisions(0, NULL, &revs, NULL);
151 }
152 prepare_revision_walk(&revs);
153 mark_edges_uninteresting(revs.commits, &revs, show_edge);
154 traverse_commit_list(&revs, show_commit, show_object);
155 exit(0);
156 }
157 if (pipe(pu_pipe) < 0)
159 die("git-upload-pack: unable to create pipe");
160 if (pipe(pe_pipe) < 0)
161 die("git-upload-pack: unable to create pipe");
162 pid_pack_objects = fork();
163 if (pid_pack_objects < 0) {
164 /* daemon sets things up to ignore TERM */
165 kill(pid_rev_list, SIGKILL);
166 die("git-upload-pack: unable to fork git-pack-objects");
167 }
168 if (!pid_pack_objects) {
169 dup2(lp_pipe[0], 0);
170 dup2(pu_pipe[1], 1);
171 dup2(pe_pipe[1], 2);
172 close(lp_pipe[0]);
174 close(lp_pipe[1]);
175 close(pu_pipe[0]);
176 close(pu_pipe[1]);
177 close(pe_pipe[0]);
178 close(pe_pipe[1]);
179 execl_git_cmd("pack-objects", "--stdout", "--progress",
180 use_ofs_delta ? "--delta-base-offset" : NULL,
181 NULL);
182 kill(pid_rev_list, SIGKILL);
183 die("git-upload-pack: unable to exec git-pack-objects");
184 }
185 close(lp_pipe[0]);
187 close(lp_pipe[1]);
188 /* We read from pe_pipe[0] to capture stderr output for
190 * progress bar, and pu_pipe[0] to capture the pack data.
191 */
192 close(pe_pipe[1]);
193 close(pu_pipe[1]);
194 while (1) {
196 const char *who;
197 struct pollfd pfd[2];
198 pid_t pid;
199 int status;
200 ssize_t sz;
201 int pe, pu, pollsize;
202 reset_timeout();
204 pollsize = 0;
206 pe = pu = -1;
207 if (0 <= pu_pipe[0]) {
209 pfd[pollsize].fd = pu_pipe[0];
210 pfd[pollsize].events = POLLIN;
211 pu = pollsize;
212 pollsize++;
213 }
214 if (0 <= pe_pipe[0]) {
215 pfd[pollsize].fd = pe_pipe[0];
216 pfd[pollsize].events = POLLIN;
217 pe = pollsize;
218 pollsize++;
219 }
220 if (pollsize) {
222 if (poll(pfd, pollsize, -1) < 0) {
223 if (errno != EINTR) {
224 error("poll failed, resuming: %s",
225 strerror(errno));
226 sleep(1);
227 }
228 continue;
229 }
230 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
231 /* Data ready; we keep the last byte
232 * to ourselves in case we detect
233 * broken rev-list, so that we can
234 * leave the stream corrupted. This
235 * is unfortunate -- unpack-objects
236 * would happily accept a valid pack
237 * data with trailing garbage, so
238 * appending garbage after we pass all
239 * the pack data is not good enough to
240 * signal breakage to downstream.
241 */
242 char *cp = data;
243 ssize_t outsz = 0;
244 if (0 <= buffered) {
245 *cp++ = buffered;
246 outsz++;
247 }
248 sz = read(pu_pipe[0], cp,
249 sizeof(data) - outsz);
250 if (0 < sz)
251 ;
252 else if (sz == 0) {
253 close(pu_pipe[0]);
254 pu_pipe[0] = -1;
255 }
256 else
257 goto fail;
258 sz += outsz;
259 if (1 < sz) {
260 buffered = data[sz-1] & 0xFF;
261 sz--;
262 }
263 else
264 buffered = -1;
265 sz = send_client_data(1, data, sz);
266 if (sz < 0)
267 goto fail;
268 }
269 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
270 /* Status ready; we ship that in the side-band
271 * or dump to the standard error.
272 */
273 sz = read(pe_pipe[0], progress,
274 sizeof(progress));
275 if (0 < sz)
276 send_client_data(2, progress, sz);
277 else if (sz == 0) {
278 close(pe_pipe[0]);
279 pe_pipe[0] = -1;
280 }
281 else
282 goto fail;
283 }
284 }
285 /* See if the children are still there */
287 if (pid_rev_list || pid_pack_objects) {
288 pid = waitpid(-1, &status, WNOHANG);
289 if (!pid)
290 continue;
291 who = ((pid == pid_rev_list) ? "git-rev-list" :
292 (pid == pid_pack_objects) ? "git-pack-objects" :
293 NULL);
294 if (!who) {
295 if (pid < 0) {
296 error("git-upload-pack: %s",
297 strerror(errno));
298 goto fail;
299 }
300 error("git-upload-pack: we weren't "
301 "waiting for %d", pid);
302 continue;
303 }
304 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
305 error("git-upload-pack: %s died with error.",
306 who);
307 goto fail;
308 }
309 if (pid == pid_rev_list)
310 pid_rev_list = 0;
311 if (pid == pid_pack_objects)
312 pid_pack_objects = 0;
313 if (pid_rev_list || pid_pack_objects)
314 continue;
315 }
316 /* both died happily */
318 if (pollsize)
319 continue;
320 /* flush the data */
322 if (0 <= buffered) {
323 data[0] = buffered;
324 sz = send_client_data(1, data, 1);
325 if (sz < 0)
326 goto fail;
327 fprintf(stderr, "flushed.\n");
328 }
329 if (use_sideband)
330 packet_flush(1);
331 return;
332 }
333 fail:
334 if (pid_pack_objects)
335 kill(pid_pack_objects, SIGKILL);
336 if (pid_rev_list)
337 kill(pid_rev_list, SIGKILL);
338 send_client_data(3, abort_msg, sizeof(abort_msg));
339 die("git-upload-pack: %s", abort_msg);
340}
341static int got_sha1(char *hex, unsigned char *sha1)
343{
344 struct object *o;
345 int we_knew_they_have = 0;
346 if (get_sha1_hex(hex, sha1))
348 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
349 if (!has_sha1_file(sha1))
350 return -1;
351 o = lookup_object(sha1);
353 if (!(o && o->parsed))
354 o = parse_object(sha1);
355 if (!o)
356 die("oops (%s)", sha1_to_hex(sha1));
357 if (o->type == OBJ_COMMIT) {
358 struct commit_list *parents;
359 struct commit *commit = (struct commit *)o;
360 if (o->flags & THEY_HAVE)
361 we_knew_they_have = 1;
362 else
363 o->flags |= THEY_HAVE;
364 if (!oldest_have || (commit->date < oldest_have))
365 oldest_have = commit->date;
366 for (parents = commit->parents;
367 parents;
368 parents = parents->next)
369 parents->item->object.flags |= THEY_HAVE;
370 }
371 if (!we_knew_they_have) {
372 add_object_array(o, NULL, &have_obj);
373 return 1;
374 }
375 return 0;
376}
377static int reachable(struct commit *want)
379{
380 struct commit_list *work = NULL;
381 insert_by_date(want, &work);
383 while (work) {
384 struct commit_list *list = work->next;
385 struct commit *commit = work->item;
386 free(work);
387 work = list;
388 if (commit->object.flags & THEY_HAVE) {
390 want->object.flags |= COMMON_KNOWN;
391 break;
392 }
393 if (!commit->object.parsed)
394 parse_object(commit->object.sha1);
395 if (commit->object.flags & REACHABLE)
396 continue;
397 commit->object.flags |= REACHABLE;
398 if (commit->date < oldest_have)
399 continue;
400 for (list = commit->parents; list; list = list->next) {
401 struct commit *parent = list->item;
402 if (!(parent->object.flags & REACHABLE))
403 insert_by_date(parent, &work);
404 }
405 }
406 want->object.flags |= REACHABLE;
407 clear_commit_marks(want, REACHABLE);
408 free_commit_list(work);
409 return (want->object.flags & COMMON_KNOWN);
410}
411static int ok_to_give_up(void)
413{
414 int i;
415 if (!have_obj.nr)
417 return 0;
418 for (i = 0; i < want_obj.nr; i++) {
420 struct object *want = want_obj.objects[i].item;
421 if (want->flags & COMMON_KNOWN)
423 continue;
424 want = deref_tag(want, "a want line", 0);
425 if (!want || want->type != OBJ_COMMIT) {
426 /* no way to tell if this is reachable by
427 * looking at the ancestry chain alone, so
428 * leave a note to ourselves not to worry about
429 * this object anymore.
430 */
431 want_obj.objects[i].item->flags |= COMMON_KNOWN;
432 continue;
433 }
434 if (!reachable((struct commit *)want))
435 return 0;
436 }
437 return 1;
438}
439static int get_common_commits(void)
441{
442 static char line[1000];
443 unsigned char sha1[20];
444 char hex[41], last_hex[41];
445 int len;
446 track_object_refs = 0;
448 save_commit_buffer = 0;
449 for(;;) {
451 len = packet_read_line(0, line, sizeof(line));
452 reset_timeout();
453 if (!len) {
455 if (have_obj.nr == 0 || multi_ack)
456 packet_write(1, "NAK\n");
457 continue;
458 }
459 len = strip(line, len);
460 if (!strncmp(line, "have ", 5)) {
461 switch (got_sha1(line+5, sha1)) {
462 case -1: /* they have what we do not */
463 if (multi_ack && ok_to_give_up())
464 packet_write(1, "ACK %s continue\n",
465 sha1_to_hex(sha1));
466 break;
467 default:
468 memcpy(hex, sha1_to_hex(sha1), 41);
469 if (multi_ack) {
470 const char *msg = "ACK %s continue\n";
471 packet_write(1, msg, hex);
472 memcpy(last_hex, hex, 41);
473 }
474 else if (have_obj.nr == 1)
475 packet_write(1, "ACK %s\n", hex);
476 break;
477 }
478 continue;
479 }
480 if (!strcmp(line, "done")) {
481 if (have_obj.nr > 0) {
482 if (multi_ack)
483 packet_write(1, "ACK %s\n", last_hex);
484 return 0;
485 }
486 packet_write(1, "NAK\n");
487 return -1;
488 }
489 die("git-upload-pack: expected SHA1 list, got '%s'", line);
490 }
491}
492static void receive_needs(void)
494{
495 struct object_array shallows = {0, 0, NULL};
496 static char line[1000];
497 int len, depth = 0;
498 for (;;) {
500 struct object *o;
501 unsigned char sha1_buf[20];
502 len = packet_read_line(0, line, sizeof(line));
503 reset_timeout();
504 if (!len)
505 break;
506 if (!strncmp("shallow ", line, 8)) {
508 unsigned char sha1[20];
509 struct object *object;
510 use_thin_pack = 0;
511 if (get_sha1(line + 8, sha1))
512 die("invalid shallow line: %s", line);
513 object = parse_object(sha1);
514 if (!object)
515 die("did not find object for %s", line);
516 object->flags |= CLIENT_SHALLOW;
517 add_object_array(object, NULL, &shallows);
518 continue;
519 }
520 if (!strncmp("deepen ", line, 7)) {
521 char *end;
522 use_thin_pack = 0;
523 depth = strtol(line + 7, &end, 0);
524 if (end == line + 7 || depth <= 0)
525 die("Invalid deepen: %s", line);
526 continue;
527 }
528 if (strncmp("want ", line, 5) ||
529 get_sha1_hex(line+5, sha1_buf))
530 die("git-upload-pack: protocol error, "
531 "expected to get sha, not '%s'", line);
532 if (strstr(line+45, "multi_ack"))
533 multi_ack = 1;
534 if (strstr(line+45, "thin-pack"))
535 use_thin_pack = 1;
536 if (strstr(line+45, "ofs-delta"))
537 use_ofs_delta = 1;
538 if (strstr(line+45, "side-band-64k"))
539 use_sideband = LARGE_PACKET_MAX;
540 else if (strstr(line+45, "side-band"))
541 use_sideband = DEFAULT_PACKET_MAX;
542 /* We have sent all our refs already, and the other end
544 * should have chosen out of them; otherwise they are
545 * asking for nonsense.
546 *
547 * Hmph. We may later want to allow "want" line that
548 * asks for something like "master~10" (symbolic)...
549 * would it make sense? I don't know.
550 */
551 o = lookup_object(sha1_buf);
552 if (!o || !(o->flags & OUR_REF))
553 die("git-upload-pack: not our ref %s", line+5);
554 if (!(o->flags & WANTED)) {
555 o->flags |= WANTED;
556 add_object_array(o, NULL, &want_obj);
557 }
558 }
559 if (depth == 0 && shallows.nr == 0)
560 return;
561 if (depth > 0) {
562 struct commit_list *result, *backup;
563 int i;
564 backup = result = get_shallow_commits(&want_obj, depth,
565 SHALLOW, NOT_SHALLOW);
566 while (result) {
567 struct object *object = &result->item->object;
568 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
569 packet_write(1, "shallow %s",
570 sha1_to_hex(object->sha1));
571 register_shallow(object->sha1);
572 }
573 result = result->next;
574 }
575 free_commit_list(backup);
576 for (i = 0; i < shallows.nr; i++) {
577 struct object *object = shallows.objects[i].item;
578 if (object->flags & NOT_SHALLOW) {
579 struct commit_list *parents;
580 packet_write(1, "unshallow %s",
581 sha1_to_hex(object->sha1));
582 object->flags &= ~CLIENT_SHALLOW;
583 /* make sure the real parents are parsed */
584 unregister_shallow(object->sha1);
585 object->parsed = 0;
586 parse_commit((struct commit *)object);
587 parents = ((struct commit *)object)->parents;
588 while (parents) {
589 add_object_array(&parents->item->object,
590 NULL, &want_obj);
591 parents = parents->next;
592 }
593 }
594 /* make sure commit traversal conforms to client */
595 register_shallow(object->sha1);
596 }
597 packet_flush(1);
598 } else
599 if (shallows.nr > 0) {
600 int i;
601 for (i = 0; i < shallows.nr; i++)
602 register_shallow(shallows.objects[i].item->sha1);
603 }
604 free(shallows.objects);
605}
606static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
608{
609 static const char *capabilities = "multi_ack thin-pack side-band"
610 " side-band-64k ofs-delta shallow";
611 struct object *o = parse_object(sha1);
612 if (!o)
614 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
615 if (capabilities)
617 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
618 0, capabilities);
619 else
620 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
621 capabilities = NULL;
622 if (!(o->flags & OUR_REF)) {
623 o->flags |= OUR_REF;
624 nr_our_refs++;
625 }
626 if (o->type == OBJ_TAG) {
627 o = deref_tag(o, refname, 0);
628 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
629 }
630 return 0;
631}
632static void upload_pack(void)
634{
635 reset_timeout();
636 head_ref(send_ref, NULL);
637 for_each_ref(send_ref, NULL);
638 packet_flush(1);
639 receive_needs();
640 if (want_obj.nr) {
641 get_common_commits();
642 create_pack_file();
643 }
644}
645int main(int argc, char **argv)
647{
648 char *dir;
649 int i;
650 int strict = 0;
651 for (i = 1; i < argc; i++) {
653 char *arg = argv[i];
654 if (arg[0] != '-')
656 break;
657 if (!strcmp(arg, "--strict")) {
658 strict = 1;
659 continue;
660 }
661 if (!strncmp(arg, "--timeout=", 10)) {
662 timeout = atoi(arg+10);
663 continue;
664 }
665 if (!strcmp(arg, "--")) {
666 i++;
667 break;
668 }
669 }
670
671 if (i != argc-1)
672 usage(upload_pack_usage);
673 dir = argv[i];
674 if (!enter_repo(dir, strict))
676 die("'%s': unable to chdir or not a git archive", dir);
677 upload_pack();
679 return 0;
680}