4a9d6720a5a0e9977bd9346e649666ead4e18fe4
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 o->flags &= ~UNINTERESTING;
142 add_pending_object(&revs, o, NULL);
143 }
144 for (i = 0; i < have_obj.nr; i++) {
145 struct object *o = have_obj.objects[i].item;
146 o->flags |= UNINTERESTING;
147 add_pending_object(&revs, o, NULL);
148 }
149 setup_revisions(0, NULL, &revs, NULL);
150 }
151 prepare_revision_walk(&revs);
152 mark_edges_uninteresting(revs.commits, &revs, show_edge);
153 traverse_commit_list(&revs, show_commit, show_object);
154 exit(0);
155 }
156 if (pipe(pu_pipe) < 0)
158 die("git-upload-pack: unable to create pipe");
159 if (pipe(pe_pipe) < 0)
160 die("git-upload-pack: unable to create pipe");
161 pid_pack_objects = fork();
162 if (pid_pack_objects < 0) {
163 /* daemon sets things up to ignore TERM */
164 kill(pid_rev_list, SIGKILL);
165 die("git-upload-pack: unable to fork git-pack-objects");
166 }
167 if (!pid_pack_objects) {
168 dup2(lp_pipe[0], 0);
169 dup2(pu_pipe[1], 1);
170 dup2(pe_pipe[1], 2);
171 close(lp_pipe[0]);
173 close(lp_pipe[1]);
174 close(pu_pipe[0]);
175 close(pu_pipe[1]);
176 close(pe_pipe[0]);
177 close(pe_pipe[1]);
178 execl_git_cmd("pack-objects", "--stdout", "--progress",
179 use_ofs_delta ? "--delta-base-offset" : NULL,
180 NULL);
181 kill(pid_rev_list, SIGKILL);
182 die("git-upload-pack: unable to exec git-pack-objects");
183 }
184 close(lp_pipe[0]);
186 close(lp_pipe[1]);
187 /* We read from pe_pipe[0] to capture stderr output for
189 * progress bar, and pu_pipe[0] to capture the pack data.
190 */
191 close(pe_pipe[1]);
192 close(pu_pipe[1]);
193 while (1) {
195 const char *who;
196 struct pollfd pfd[2];
197 pid_t pid;
198 int status;
199 ssize_t sz;
200 int pe, pu, pollsize;
201 reset_timeout();
203 pollsize = 0;
205 pe = pu = -1;
206 if (0 <= pu_pipe[0]) {
208 pfd[pollsize].fd = pu_pipe[0];
209 pfd[pollsize].events = POLLIN;
210 pu = pollsize;
211 pollsize++;
212 }
213 if (0 <= pe_pipe[0]) {
214 pfd[pollsize].fd = pe_pipe[0];
215 pfd[pollsize].events = POLLIN;
216 pe = pollsize;
217 pollsize++;
218 }
219 if (pollsize) {
221 if (poll(pfd, pollsize, -1) < 0) {
222 if (errno != EINTR) {
223 error("poll failed, resuming: %s",
224 strerror(errno));
225 sleep(1);
226 }
227 continue;
228 }
229 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
230 /* Data ready; we keep the last byte
231 * to ourselves in case we detect
232 * broken rev-list, so that we can
233 * leave the stream corrupted. This
234 * is unfortunate -- unpack-objects
235 * would happily accept a valid pack
236 * data with trailing garbage, so
237 * appending garbage after we pass all
238 * the pack data is not good enough to
239 * signal breakage to downstream.
240 */
241 char *cp = data;
242 ssize_t outsz = 0;
243 if (0 <= buffered) {
244 *cp++ = buffered;
245 outsz++;
246 }
247 sz = read(pu_pipe[0], cp,
248 sizeof(data) - outsz);
249 if (0 < sz)
250 ;
251 else if (sz == 0) {
252 close(pu_pipe[0]);
253 pu_pipe[0] = -1;
254 }
255 else
256 goto fail;
257 sz += outsz;
258 if (1 < sz) {
259 buffered = data[sz-1] & 0xFF;
260 sz--;
261 }
262 else
263 buffered = -1;
264 sz = send_client_data(1, data, sz);
265 if (sz < 0)
266 goto fail;
267 }
268 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
269 /* Status ready; we ship that in the side-band
270 * or dump to the standard error.
271 */
272 sz = read(pe_pipe[0], progress,
273 sizeof(progress));
274 if (0 < sz)
275 send_client_data(2, progress, sz);
276 else if (sz == 0) {
277 close(pe_pipe[0]);
278 pe_pipe[0] = -1;
279 }
280 else
281 goto fail;
282 }
283 }
284 /* See if the children are still there */
286 if (pid_rev_list || pid_pack_objects) {
287 pid = waitpid(-1, &status, WNOHANG);
288 if (!pid)
289 continue;
290 who = ((pid == pid_rev_list) ? "git-rev-list" :
291 (pid == pid_pack_objects) ? "git-pack-objects" :
292 NULL);
293 if (!who) {
294 if (pid < 0) {
295 error("git-upload-pack: %s",
296 strerror(errno));
297 goto fail;
298 }
299 error("git-upload-pack: we weren't "
300 "waiting for %d", pid);
301 continue;
302 }
303 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
304 error("git-upload-pack: %s died with error.",
305 who);
306 goto fail;
307 }
308 if (pid == pid_rev_list)
309 pid_rev_list = 0;
310 if (pid == pid_pack_objects)
311 pid_pack_objects = 0;
312 if (pid_rev_list || pid_pack_objects)
313 continue;
314 }
315 /* both died happily */
317 if (pollsize)
318 continue;
319 /* flush the data */
321 if (0 <= buffered) {
322 data[0] = buffered;
323 sz = send_client_data(1, data, 1);
324 if (sz < 0)
325 goto fail;
326 fprintf(stderr, "flushed.\n");
327 }
328 if (use_sideband)
329 packet_flush(1);
330 return;
331 }
332 fail:
333 if (pid_pack_objects)
334 kill(pid_pack_objects, SIGKILL);
335 if (pid_rev_list)
336 kill(pid_rev_list, SIGKILL);
337 send_client_data(3, abort_msg, sizeof(abort_msg));
338 die("git-upload-pack: %s", abort_msg);
339}
340static int got_sha1(char *hex, unsigned char *sha1)
342{
343 struct object *o;
344 int we_knew_they_have = 0;
345 if (get_sha1_hex(hex, sha1))
347 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
348 if (!has_sha1_file(sha1))
349 return -1;
350 o = lookup_object(sha1);
352 if (!(o && o->parsed))
353 o = parse_object(sha1);
354 if (!o)
355 die("oops (%s)", sha1_to_hex(sha1));
356 if (o->type == OBJ_COMMIT) {
357 struct commit_list *parents;
358 struct commit *commit = (struct commit *)o;
359 if (o->flags & THEY_HAVE)
360 we_knew_they_have = 1;
361 else
362 o->flags |= THEY_HAVE;
363 if (!oldest_have || (commit->date < oldest_have))
364 oldest_have = commit->date;
365 for (parents = commit->parents;
366 parents;
367 parents = parents->next)
368 parents->item->object.flags |= THEY_HAVE;
369 }
370 if (!we_knew_they_have) {
371 add_object_array(o, NULL, &have_obj);
372 return 1;
373 }
374 return 0;
375}
376static int reachable(struct commit *want)
378{
379 struct commit_list *work = NULL;
380 insert_by_date(want, &work);
382 while (work) {
383 struct commit_list *list = work->next;
384 struct commit *commit = work->item;
385 free(work);
386 work = list;
387 if (commit->object.flags & THEY_HAVE) {
389 want->object.flags |= COMMON_KNOWN;
390 break;
391 }
392 if (!commit->object.parsed)
393 parse_object(commit->object.sha1);
394 if (commit->object.flags & REACHABLE)
395 continue;
396 commit->object.flags |= REACHABLE;
397 if (commit->date < oldest_have)
398 continue;
399 for (list = commit->parents; list; list = list->next) {
400 struct commit *parent = list->item;
401 if (!(parent->object.flags & REACHABLE))
402 insert_by_date(parent, &work);
403 }
404 }
405 want->object.flags |= REACHABLE;
406 clear_commit_marks(want, REACHABLE);
407 free_commit_list(work);
408 return (want->object.flags & COMMON_KNOWN);
409}
410static int ok_to_give_up(void)
412{
413 int i;
414 if (!have_obj.nr)
416 return 0;
417 for (i = 0; i < want_obj.nr; i++) {
419 struct object *want = want_obj.objects[i].item;
420 if (want->flags & COMMON_KNOWN)
422 continue;
423 want = deref_tag(want, "a want line", 0);
424 if (!want || want->type != OBJ_COMMIT) {
425 /* no way to tell if this is reachable by
426 * looking at the ancestry chain alone, so
427 * leave a note to ourselves not to worry about
428 * this object anymore.
429 */
430 want_obj.objects[i].item->flags |= COMMON_KNOWN;
431 continue;
432 }
433 if (!reachable((struct commit *)want))
434 return 0;
435 }
436 return 1;
437}
438static int get_common_commits(void)
440{
441 static char line[1000];
442 unsigned char sha1[20];
443 char hex[41], last_hex[41];
444 int len;
445 track_object_refs = 0;
447 save_commit_buffer = 0;
448 for(;;) {
450 len = packet_read_line(0, line, sizeof(line));
451 reset_timeout();
452 if (!len) {
454 if (have_obj.nr == 0 || multi_ack)
455 packet_write(1, "NAK\n");
456 continue;
457 }
458 len = strip(line, len);
459 if (!strncmp(line, "have ", 5)) {
460 switch (got_sha1(line+5, sha1)) {
461 case -1: /* they have what we do not */
462 if (multi_ack && ok_to_give_up())
463 packet_write(1, "ACK %s continue\n",
464 sha1_to_hex(sha1));
465 break;
466 default:
467 memcpy(hex, sha1_to_hex(sha1), 41);
468 if (multi_ack) {
469 const char *msg = "ACK %s continue\n";
470 packet_write(1, msg, hex);
471 memcpy(last_hex, hex, 41);
472 }
473 else if (have_obj.nr == 1)
474 packet_write(1, "ACK %s\n", hex);
475 break;
476 }
477 continue;
478 }
479 if (!strcmp(line, "done")) {
480 if (have_obj.nr > 0) {
481 if (multi_ack)
482 packet_write(1, "ACK %s\n", last_hex);
483 return 0;
484 }
485 packet_write(1, "NAK\n");
486 return -1;
487 }
488 die("git-upload-pack: expected SHA1 list, got '%s'", line);
489 }
490}
491static void receive_needs(void)
493{
494 struct object_array shallows = {0, 0, NULL};
495 static char line[1000];
496 int len, depth = 0;
497 for (;;) {
499 struct object *o;
500 unsigned char sha1_buf[20];
501 len = packet_read_line(0, line, sizeof(line));
502 reset_timeout();
503 if (!len)
504 break;
505 if (!strncmp("shallow ", line, 8)) {
507 unsigned char sha1[20];
508 struct object *object;
509 use_thin_pack = 0;
510 if (get_sha1(line + 8, sha1))
511 die("invalid shallow line: %s", line);
512 object = parse_object(sha1);
513 if (!object)
514 die("did not find object for %s", line);
515 object->flags |= CLIENT_SHALLOW;
516 add_object_array(object, NULL, &shallows);
517 continue;
518 }
519 if (!strncmp("deepen ", line, 7)) {
520 char *end;
521 use_thin_pack = 0;
522 depth = strtol(line + 7, &end, 0);
523 if (end == line + 7 || depth <= 0)
524 die("Invalid deepen: %s", line);
525 continue;
526 }
527 if (strncmp("want ", line, 5) ||
528 get_sha1_hex(line+5, sha1_buf))
529 die("git-upload-pack: protocol error, "
530 "expected to get sha, not '%s'", line);
531 if (strstr(line+45, "multi_ack"))
532 multi_ack = 1;
533 if (strstr(line+45, "thin-pack"))
534 use_thin_pack = 1;
535 if (strstr(line+45, "ofs-delta"))
536 use_ofs_delta = 1;
537 if (strstr(line+45, "side-band-64k"))
538 use_sideband = LARGE_PACKET_MAX;
539 else if (strstr(line+45, "side-band"))
540 use_sideband = DEFAULT_PACKET_MAX;
541 /* 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.
545 *
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.
549 */
550 o = lookup_object(sha1_buf);
551 if (!o || !(o->flags & OUR_REF))
552 die("git-upload-pack: not our ref %s", line+5);
553 if (!(o->flags & WANTED)) {
554 o->flags |= WANTED;
555 add_object_array(o, NULL, &want_obj);
556 }
557 }
558 if (depth == 0 && shallows.nr == 0)
559 return;
560 if (depth > 0) {
561 struct commit_list *result, *backup;
562 int i;
563 backup = result = get_shallow_commits(&want_obj, depth,
564 SHALLOW, NOT_SHALLOW);
565 while (result) {
566 struct object *object = &result->item->object;
567 if (!(object->flags & CLIENT_SHALLOW)) {
568 packet_write(1, "shallow %s",
569 sha1_to_hex(object->sha1));
570 register_shallow(object->sha1);
571 }
572 result = result->next;
573 }
574 free_commit_list(backup);
575 for (i = 0; i < shallows.nr; i++) {
576 struct object *object = shallows.objects[i].item;
577 if (object->flags & NOT_SHALLOW) {
578 struct commit_list *parents;
579 packet_write(1, "unshallow %s",
580 sha1_to_hex(object->sha1));
581 object->flags &= ~CLIENT_SHALLOW;
582 /* make sure the real parents are parsed */
583 unregister_shallow(object->sha1);
584 parse_commit((struct commit *)object);
585 parents = ((struct commit *)object)->parents;
586 while (parents) {
587 add_object_array(&parents->item->object,
588 NULL, &want_obj);
589 parents = parents->next;
590 }
591 }
592 /* make sure commit traversal conforms to client */
593 register_shallow(object->sha1);
594 }
595 packet_flush(1);
596 } else
597 if (shallows.nr > 0) {
598 int i;
599 for (i = 0; i < shallows.nr; i++)
600 register_shallow(shallows.objects[i].item->sha1);
601 }
602 free(shallows.objects);
603}
604static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
606{
607 static const char *capabilities = "multi_ack thin-pack side-band"
608 " side-band-64k ofs-delta shallow";
609 struct object *o = parse_object(sha1);
610 if (!o)
612 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
613 if (capabilities)
615 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
616 0, capabilities);
617 else
618 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
619 capabilities = NULL;
620 if (!(o->flags & OUR_REF)) {
621 o->flags |= OUR_REF;
622 nr_our_refs++;
623 }
624 if (o->type == OBJ_TAG) {
625 o = deref_tag(o, refname, 0);
626 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
627 }
628 return 0;
629}
630static void upload_pack(void)
632{
633 reset_timeout();
634 head_ref(send_ref, NULL);
635 for_each_ref(send_ref, NULL);
636 packet_flush(1);
637 receive_needs();
638 if (want_obj.nr) {
639 get_common_commits();
640 create_pack_file();
641 }
642}
643int main(int argc, char **argv)
645{
646 char *dir;
647 int i;
648 int strict = 0;
649 for (i = 1; i < argc; i++) {
651 char *arg = argv[i];
652 if (arg[0] != '-')
654 break;
655 if (!strcmp(arg, "--strict")) {
656 strict = 1;
657 continue;
658 }
659 if (!strncmp(arg, "--timeout=", 10)) {
660 timeout = atoi(arg+10);
661 continue;
662 }
663 if (!strcmp(arg, "--")) {
664 i++;
665 break;
666 }
667 }
668
669 if (i != argc-1)
670 usage(upload_pack_usage);
671 dir = argv[i];
672 if (!enter_repo(dir, strict))
674 die("'%s': unable to chdir or not a git archive", dir);
675 upload_pack();
677 return 0;
678}